US1362464A - Telephone attachment - Google Patents

Description

. C. BAUM AND E. H. TALBERT.- TELEPHONE ATTACHMENT.

APP/LICATION FILED OCT. 10. 1917.

4 SHEETS-SHEET 1.

Patented Dec. 14,1920. 1

c. BAUM AND E. H. T'ALBERTf TELEPHONE ATTACHMENT. APPLICATION FILED ocr. 10. 1917.

1,3 2,4 v Patented Dc. 14,1920.

4 SHEETS-SHEET 2.

we I3 57 1 l) J L512 3 gmento'tz altozneig CfBAUM AND E. HITALBERT.

TELEPHONE ATTACHMENT.

APPLICATION FILED ocT. 10,1917.

Patented Dec.'14, 1920 4 SHEETS-SHEET 3- attozwzg C. BAUM AND'E. H..TALBE RT.

TELEPHONE ATTACHMENT. APPLICATION man OCT. .10. I917.

' Patented Dec.

UNITED STATES PATENT OFFICE.

CHARLES BAUM AND EDGAR H. TALBERT,

SAID TALBERT ASSIGNOR T0 SAID'BAUM.

OF WASHINGTON, DISTRICT COLUMBIA;

TELEPHONE ATTACHMENT.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application filed October 10, 1917. Serial No. 195,773.

To all whom, it may concern:

Be it known that we, CHARLES BAUM and EDGAR H. TALBERT, Citizens of the United States of America, residing at Vashington, District of Columbia, have invented new and useful Telephone Attachments, of which the following is a specification.

Designed for particular use with desk telephones, the principal purpose of the invention is the provision of a device for fixed attachment to such a telephone, the device having a lever overlying the receiver hook of the telephone and locking the hook in the depressed position except at times when it is desired to use the telephone, when the lever may be released by the insertion of a coin or key'into' the device.

A further purpose of the invention is to provide for the device a register connected with the coin or key releasing mechanism thereof, so that each time the telephone is used for an outgoing call, such call will be recorded.

A still further purpose contemplates the provision of means forunlocking the lever of the device in response to the operation of the signal bell of the telephone when an incoming call is being made, this means effecting the unlocking of the lever without operating the register and also effecting the relocking of the lever after a prescribed interval of time, in the event that the telephone is not answered within the said interval of time following the operation of the signal bell.

A still further purpose of the invention is to provide a casingv in which the locking lever is pivoted and from which it projects, this casing standing beside the telephone and containing all the attendant mechanism which permits the locking lever to perform its functions in each of the several ways mentioned above.

A still further purpose is the provision of means conjoined with the locking lever whereby, when the latter has been once released and the receiver hook allowed to rise preparatory to making an outgoing or answering an incoming call, the receiver hook may be vibrated to attract the attention of the central operator without relocking the lever.

A still further purpose aims at the provision of a suitable base for the casing which carries the locking lever, this base permit ting the whole device to be attached to the base of a desk telephone in such a manner that it cannot be removed therefrom except by the disconnecting of a clamp positioned within the casing;

Still further and other purposes will be made to appear as the invention is set forth in detail in the description which follows.

To the exact construction in which it is shown and described, the invention is not to be restricted. The actual reduction to practice may show certain desirable changes or alterations to be of advantage and the right is claimed to make any which do not depart from the spirit of the subjoined claims.

The same numerals of reference designate the same parts throughout the of the drawings, wherein:

Figure 1 is a view in side elevation showing the application of the invention to a conventional form of desk telephone.

Fig. 2 is a front elevation of the structure shown in Fig. 1.

Fig. 3 is a top plan view.

Fig. i is a vertical sectional view through that portion of the casing of the device which contains all its operating mechanism.

Fig. 5 is a section on the line 5-5 of Fig. at.

Fig. 6 is a section on the line 6-6 of Fig. 4:.

Fig. 7 is a section on the line 7- -7 of Fig. 4.

Fig. 8 is an enlarged detail view showing in end elevation the mechanism comprising the time trip.

Fig. 9 is a front elevation of the structure in Fig. 8.

Fig. 10 is a section on the line 10-10 of Fig. 8.

Fig. 11 is a diagrammatic view of the electro mechanical mechanism connected with the time trip.

Fig. 12 is a perspective view of the guard used to inclose the bells of the magneto and devices conjoined therewith.

Fig. 13.is a detail collective perspective of v the connecting ends of the several levers forming the locking device.

Fig. 1% is a perspective view of the key used for operating the locking device.

Fig. 15 is an enlarged detail view of a portion of the escape wheel with its attendant pawl and the lever associated therewith.

Fig.- 16 is a section on line 16 of Fig. 15.

' Referring to the drawings, there is shown,

a conventional form of desk telephone A having the attachment B secured to it. The telephone is provided with the usual base several figures 1. the receiver hook 2 and the receiver 3, the attachment comprising a casing 4 and a hollow column 5 on which the casing is supported. A lever 6 is pivotally mounted within the casing and extends far enough out therefrom to overlie the receiver hook 2 adjacent the point where the latter enters the telephone structure. The attachment is fixedl connected to the telephone by means 0 a crow-foot base made up of two arms 7 and a third arm 8, the latter being permanently connected with the bottom of the column 5. These three arms comprising the base of the attachment are designed for embedding in the felt covering 9 ordinarily attached to the telephone base 1 and the two arms 7 terminate in integral hook members 10 which hook around the edge of the telephone. base, thus securing these arms to the latter. The arm 8 is secured to the telephone base by means of a detachable Z-shaped clamping member 11 whose one leg overlies the telephone base and whose other leg is secured to the bottom of the column 5 by a detachable device 12, this clamping member 11 being secured to the bottom of the column on the interior of the latter.

When the crow-foot base of the device is attached to the telephone base in the manner just described, its column 5 stands parallel with the body of the telephone and abuts the base of the latter on the edge, thus permitting the lever 6 to lie on top. of the receiver hook 2 near the point where the latter enters the telephonestructure, as before described.

The column 5' is hollow and access is had to the interior thereof by means of a hingedly mounted door-.13 which is held -in the position of closure by any suitable locking device 14.

The casing 4 which is approximately square in elevation is positioned on top of the column 5 to which it is attached in any appropriate manner. In the upper right hand corner, the casing .4 carries a conventional form of register 15 which is interior to the casing but whose dials 16 are visible through the holes formed in the front of the casing. A coin chute 17 is also carried within the casing 4 against the back thereof, this. coin chute projecting from the easing through the top adjacent the left side, then curving over toward the center of the casing as it passes down through the latter and finally communicating with the interior of the column 5 through the bottom of the casing.

A stud 18 is attached at an app opriate point on one face of the chute 17 and this stud carries at its end a bell crank lever 19 which is pivotally connected to the stud and whose shorter arm effects pivotal engagement with the end of the arm 20 which is casing 4. The purpose of this lateral'extension 21 is to communicate movement to the lever 19 and through the latter effect the operation of the register 15 and this lateral extension is contacted with and moved by a block 22 which is rigidly secured to a lateral extension 23 formed on the upper end of the vertical leg of the bell crank lever 24. This bell crank lever 24 is pivotally mounted on the end of the stud 25 which is suitably mounted on the back wall of the casing 4 and projectstoward the front of the casing, lying close to the left hand side of the chute 17. The block 22 is designed to enter the coin chute 17 and effects this entrance through an aperture 26 formed in the side of the chute in the vicinity of the block and that end of the block which enters the chute is formed to the shape of the curve having the same the chute engaging'the coin after the latter has been once dropped into the chute and holding the coin suspended until the o eration of other devices, yet to be descrlbed, forces the coin down through the chute, thereby moving the block out. of position and rocking the bell crank lever 24 on its pivotal connection.

The legs of the bell crank lever 24 together form a right angle, thereby leaving the bottom leg in the horizontal position when the otherleg is in its normal position which is vertical.

The free end of the horizontal leg of the bell crank lever 24 is bifurcated leaving the cars 27 which are provided with holes 28, the ends of the ears being circular in out line and formed with the holes 28 as centers. On the bottom edge of this horizontal leg, there is formed an abutment shoulder 29 which is equal to the thickness of the leg and whose flat face 30 stands in a plane passing vertically through the centers of the holes 28. Connected with the horizontal leg of,

engages a stud 34 which passes through the holes 28 in the ears 27 and through the hole 33 in the ear 32. The arm 31 has an abutment shoulder 35 formed on its bottom edge which shoulder has a flat face 36 which to be raised on its pivotal connection on the pin 34 without any movement being imparted to the horizontal leg of the lever.

There is also pivotally mounted on the pin 34 a lever 37 which is attached to the pin on the front side of the lever 24, this lever 37 being provided with the hole 38 by which it is attached to the pin and being provided also with a circular end formed with the hole 38 as the center. The lever 37 is further provided with an abutment shoulder 39 having a flat face 40 adapted to abut the flat face 36 of the abutment shoulder 35 of the arm 31, this abutment shoulder 35 being extended laterally a sufficient distance to permit the shoulder 39 to contact with it. This arrangement permits the arm 31 to be raised by any force which depresses the lever 37. Thus the arm 31 may be raised by either the lever 37 or the lever 24, either one raising the arm without interfering with the other.

The lever 6 which is designed to hold the receiver hook 2 depressed is pivotally mounted within the casing 4 on a stud 41 which is attached between the front wall of the chute 17 and the front wall of the casing 4. The lever 6 on its top edge is provided with a recess in which the arm 31 is adapted to lie, the end of this arm abutting the end of the recess formed in the lever and serving to hold the lever in its lowest position where it may keep the receiver hook 2 depressed. The lever 6 passes through an opening 42 formed in the right hand side of the casing 4, this opening being of a width greater than the thickness of the lever and being provided on its bottom edge with a slot 43. The lever 6 is required to pass into the slot 43 in order to depress the receiver hook 2. The height of the opening 42 is substantially equal to the height of the lever 6 and when the latter is raised against the top edge of the opening, that portion of the lever which projects out of the casing 4 is permitted to move laterally in the opening 42, which lateral movement is made possible by the lever 6 being made in two parts which are hingedly connected together by the hinge member 44. A flat spring 45 is permanently connected on the back of that portion of the lever 6 which is on the stud 41 and this spring presses upon the hinged portion of the lever, thus imparting to it the lateral movement before referred to when the lever is not engaged in the recess 43.

The lever 6 is provided with an arm 46 projecting from its lower edge and extending around below the receiver hook 2. This arm is adapted to be contacted'with by the receiver 3 to offset the tendency of the spring 45 to break the lever at its hinged connection.

Positioned on the back of the casing 4 at a specified point above the free end of the arm 31, there is a post 47 at the end of which a hook member 48 is pivotally mounted.

This hook member 48 is provided with a laterally extending L-shaped arm 49 joined to it at the point where it effects its pivotal connection with the post. The lower end of the hook member 48 drags against the side of the arm 31 and its hook portion is intended to engage underneath the arm when the latter is raised. To trip this hook member 48 from engagement below the arm 31, an L-shaped member 50 is attached on the side of the lever 6, the turned end of this member being adapted, when the lever 6 rises, to engage underneath the laterally extending arm 49 and to rock the hook member 48 on its pivotal connection, thus effecting its release from the arm 31.

The lever 37 is designed to be operated by an electromagnet 51 positioned on the bottom of the casing 4 and interior to the latter. Positioned beside the magnet 51 and attached on the front wall of the casing 4, from which it is insulated, there is a contact member 52, the lever 37, when it is drawn down by the magnet 51, making contact with this contact member 52 to establish a circuit to a magnet 56 which is positioned on the front wall of the casing just below the stud 41. To prevent the lever 37 from contacting with the contact member 52 when the arm 31 is raised by the bell crank lever 24, a spring 53 is provided which is attached between the free end of the lever and the end of the stud 54 mounted on the front wall of the casing 4. This s ring tends normally to hold the lever 3 up against a pin 55 which is also attached on the front wall of the casing 4.

The magnets 51 and 56 are energized from a source exterior to the casing 4, this source comprising a battery 57 from which current is derived by closing the circuit of this battery through the instrumentality of a mechanism carried on the magneto casing 58. This circuit closing device comprises a plate 59 which is attached in any suitable manner on top of the box 58. A lever .60 is pivotally mounted on this plate and one end of this lever is bifurcated, so that it may straddle the stem of the clapper 61. The other end of the lever is offset in order that it may make contact with a contact member 62 which is attached to but insulated from the plate 59. Contact between the contact member' 62 and the offset end of ,the lever 60 is made and broken when the lever 60 is oscillated by the vibration of the clapper 61. One terminal of the magnet 51 is connected with the contact member 62 by a wire 63. One terminal of the battery 57 is connected with the plate 59 by a wire 64. The other terminal of the battery 57 is connected to the contact member 52 by a wire 65, the remaining terminal of the magnet 51 being attached to the wire 65 by means of a wire 66. In order that the magnet 56 may be controlled by the lever 37, one terminal of this magnet is connected to one terminal of the battery 57 by a wire 67, the other terminal of the magnet efiecting metallic connection with the casing 4 or with the lever 37 by means of the wire 68.

The magnet 56 acts as an electromagnetic release for the escape wheel 69 which is rotatably mounted on the stud 70 that is fixed in the front wall of the casing 4. This escape wheel has attached to it by means of screws 71 a ratchet wheel72 whose teeth are engaged by a pawl 73 that is loosely mounted on astud 74 attached on the back face of a sheave 75. This sheave 75 is also rotatably mounted on the stud 70 and on its outer face there is attached to it one end of the valve spring 76 which is wound in the form of a spiral and has its remainin end fixedly attached to the stud 70. It willlthus be seen that the escape wheel 69 may be rotated by any force tending to turn the sheave in the direction of the arrows (shown in Fig. 9), since the pawl 74 whichis at tached to the sheave will engage the teeth of the ratchet wheel 73, thus imparting to the escape wheel 69 the same movement that is given to the sheave 75. To govern the speed at which the escape wheel 69 moves a verge 77 is .rovided and this vergeis rockably mounted on a stud 78 fixed in the front wall of the casing 4 directly above the stud 70. The oscillations of the verge 77 are governed by an upstandin arm 79 which connects with the center 0 the verge and which carries at its free end an appropriate weighted member 80. The sheave 75 and with it the escape wheel are moved as a result of tension applied on the sprin 81 whose one end connects with one end 0 the cable 82,,which cable passes around the upper portion of the groove of the sheave and has its remaining end aflixed to the sheave in any. suitable manner.

To prevent the spring 81 from operating the escape wheel, except when certain conditions require that it operate the said wheel, a hook pawl 84 is provided which pawl is pivotally mounted on a stud 85 attached to the front wall of the casing 4. The hook pawl 84 is held normally in engagement with the teeth of the escape wheel by means of a fiat spring 86 which is attached to the front wall of the casing and bears upon the pawl. The pawl, however, is disengaged from the teeth of the escape wheel by the magnet 56 when the latter is energized, the magnet being placed in such a position that it can by attraction effect this disengagement of the pawl 84. The pawl 84 having been once disengaged from the teeth of the escape wheel 69, it is held in such disengaged position by a lever 106 which is pivotally mounted on a pin 102 which, like the pin 85, is also attached to the front wall of the casing 4. This lever 106 is provided with a projection 104 on its lower edge behind which the pin 105, which is secured to the pawl 84, engages when the pawl is withdrawn from the teeth of the escape wheel. The free end of the lever 106 has pivotall connected to it a Z-shaped lever 109, the eg 110 of which lies on the upper edge of the lever 106 and is held normally against the upper edge of this lever by a flat spring 111 which is attached on the upper edge of the lever 106.

and bears upon the upper edge of the leg 110. The nature of the combination of the levers 109 and 106, permits the free end of the lever 109 to be depressed without any relative movement of the lever 106 but it necessitates the raising of the lever 106 when the free end of the lever 109 is raised. The free end of the lever 109 lies adjacent to the periphery of the sheave 75 and the latter carries a removable lug 103 on its periphery which is designed to engage the free end of the lever 109 and to raise the latter a suflicient distance to disengage the projection 104 from the pin 105 when the spring 86 may return the pawl 84 to engagement with the teeth of the escape wheel 69.

The removable lug 103 is capable of being positioned at different points on the periphery of the sheave 75, radial holes 108 being formed in the bottom of the groove of the sheave at uniformly spaced intervals between certain points thereon. This arrangement permits the'lug 103 to be shifted to different points on the sheave 75, so that it operates to lift the lever 106 and release the pawl 84 after the elapse of specified intervals of time following the beginning of rotary movement of the sheave and the escape wheel.

5 The sheave 75 between certain points on that face to which the spring 76 is attached is provided with axially disposed holes 107 arranged at uniformly spaced intervals and any one of these holes may have inserted into it the axially disposed pin 101 which, when the sheave and the escape wheel are put in motion is adapted to move toward the hook member 48 and engage the laterally extending L-shaped arm of the latter to release the hook member from engagement beneath the lower edge of the arm 31.

To create in the spring 81 sufficient tension to enable it to impart movement to the escape wheel 69, a lever 87 is provided which is pivotally mounted on a stud 89 that is fixed in the front wall of the casing 1 near the right hand side and near the bottom of the latter. The free end of this lever ST is connected with one end of the spring 81. The lever 87 is provided with a laterally extending Z-shaped arm 88 which extends under the bottom edge of the lever 6. When the latter lever is raised, the spring 81 is relieved of tension but when the lever 6 is lowered, as it is when locked by the arm 31, the free end of the lever 87 is depressed because this lever is of necessity lowered through its connection by means of the laterally extending arm 88 with the lever 6.

A shield 90 is provided for attachment to the wall on which the magneto case 58 is hung, this. shield being designed to inclose the magneto bells and the circuit closing device comprising the plate 59 and lever 60. so that access may not be had to them to permit their manipulation by hand.

In Fig. 1-1 there is shown a key 91 which is designed for passage through a key-hole 92 formed in the front of the casing 4, the coin chute 17 being provided with a round hole 93 to receive the end of the key and'steady the same when either of its wings 91 is brought into contact with the vertical arm of the bell crank lever 24.

The block 22 is designed to hold the coin when the latter. after having been dropped into the chute 17 contacts with it. The coin is released from engagement with the block and the bell drank lever 24 operated at the time of this release by means of the bell crank lever 95 which is pivotally mounted on the pin 96 aflixed in the two ears 97 between which the bell crank lever 95 is supported. One end of the bell crank lever 95 enters the coin chute 17 through a suitable slot provided in the front wall of the chute just above and between the ears 97. This arm of the lever. however, which enters the chute is held normally in such a position that it will not interfere with the passage of a coin down through the latter. this position being obtained by means of the flat spring 98 whichis attached on the front face of the coin chute and bears on the longer arm of the lever. the end of this longer arm being engaged by the end of the pin 99 which passes slidably through a hole formed in the front of the casing 4 and which is provided with a collar 100 interior' to' the casing 4, which collar prevents the pin moving farther than a specitied distance through the front of the casing. The spring 98 besides keeping the shorter arm of the lever 95 in such a position as not to interfere with the coin passing down the chute 17. also operates to hold the pin 99 in such a position that its collar 100 abuts the inner face of the front wall of the casing.

Assume the device to be attached to a con ventional form of desk telephone by affixing its crow-foot base to the base of the telephone as before described. Let the lever 6 be in the position where the arm 31 engages in the recess, before referred to as being formed in. the lever. In order for the arm to effect this engagement in this recess, it

is necessary that the lower edge of the'lever, where it passes through the opening 42 of the casing 4. be in the recess 43 which is formed in the opening. The free end of the lever 6 will then hold the receiver book 2 depressed and it will be impossible to use the telephone because the receiver hook cannot be raised to establish the necessary connection preparatory to the use of the phone. The lever 6 may be disengaged in any one of three ways; namely, by dropping a coin in the chute 17, by using the key 91, or by the operation of the signal bells on the magneto casing. The owner or subscriber to the telephone, it is proposed, shall have a key for effecting the disengagement of the arm 31 from the lever 6. Other persons than the subscriber or owner are required to use a coin in the event that they desire to use the telephone.

Take the case of a person who is required .to use a coin. Such a person drops a coin in the top of the chute 17 and this coin passes down the chute but is arrested when brought into contact with the block 22. The coin is then in a position when it can not continue further down the chute until .the bell. crank lever 95 is operated. The pin 99 serves to operate this lever by pressure exerted upon its head. The shorter arm of the lever which projects into the coin chute then engages the upper end of the coin and forces it past the block 22, thereby forcing the projecting end of the block out of the chute and rocking the bell crank lever 24 with which the block is connected. This movement imparted to the block 22 also rocks the bell crank lever 19 which, by connection with the register 15, causes the unit hand of the latter to be moved the distance of one calibration. The rocking of the bell crank lever 24 serves to lift the arm 31 until the hook member 48 engages beneath the lower edge thereof. This movement imparted to the arm 31 by the bell crank lever 24 does not, however, result in lowering the lever 37. since the arm 31 may be raised either by the lever 24 or the lever 37 the one without disturbing the relative position ing which is higher than the recess 43 with which the lower edge of the lever previously engaged. While the receiver remains ofi its hook the call may be made over the telephone in the usual way, the receiver hook being free to be oscillated to attract the attention of the operator in the usual way, since the lever 6 is in such a position in the opening 42 that it cannot lower when the receiver hook is oscillated. When the lever 6 rises as the result of the pressure exerted by the spring on the receiver hook,

the L-shaped member 50 engages the laterally projecting L-shaped arm 49 of the hook 48 and effects the release of the hook from the lower edge of the arm 31. The arm 31 then drops back on the lever 6 but its end cannot engage the end of the recess in the latter because the lever 6 is raised. The free end of the arm 31, therefore, lies on the upper edge of the lever beyond the end of the recess.

The usual call may then be made over the telephone after which the receiver 3 is again placed on its hook. With the replacing of the receiver on its hook, the receiver engages the arm 46 connected with the hook,

thus moving the hinged end of the lever 6 I back to its former position against the pressure of the spring 45. When the weight of the receiver depresses thehook, the lever 6, then being in a position to drop 1n the recess 43, lowers into the latter by gravity. When the lever 6 lowers into the recess 43, the end of the arm 31 slides ofi the upper edge of the lever and into the recess 1n the latter prepared for it, the end of the arm engaging the end of the recess and holding the lever looked as before.

In the event that the owner or subscnber to the telephone desires to use the latter, he inserts his key 91 through the key-hole 92 and turns the key one of whose wings engages the adjacent edge of the vert1c al leg of the bell crank lever 24, operating 1t and the bell crank lever 19 in the same Way that they were operated by the coin. The same cycle of operations is performed by the various parts when the key 15 used as when .the coin is inserted through the coin chute.

The telephone is therefore, placed in condition to permit it to be used for an outgolng call and a record is made, on the register, of the telephone having been placed in such condition.

In the case of an incoming call, the clapper 61 of the bell is Set into vibration and its stem operates to oscillate the lever 60, thereby closing the circuit on the battery 57 which supplies current to the magnet 51, causing it to attract the lever 37 which operates to raise the arm 31 and permits the latter to be engaged by the hook member 48. The lever 37 eifects this movement of the arm 31 without any movement of the bellcrank levers 24 and 19. Therefore, this operation of releasing the arm 31 is not recorded on the register. This provision is made so that incoming. calls will not be recorded, since it is common practice not to charge for. these calls and a record of them is not essential and would only confuse the record of the outgoing calls for which only charges are made. To raise the arm 31 to the position where it unlocks the lever 6 would make it possible to use the telephone for an outgoing call without the use of the coin or key in case the signal of the incoming call were not answered. Provision is made against such a contingency by the use of the escape wheel and its attendant parts previously described. When the magnet 51 attracts the lever 37, the latter is brought into contact with the contact member 52, thus closing the circuit on the magnet 56 which then attracts the pawl 84, withdrawing it from engagement with the teeth of the escape wheel 69 and bringing its pin 105 behind the projection 104 of the lever 106.

In the lowered position of the lever 6, a strain is created on the spring 81 by the depression of the free end of the lever 87. Therefore, when the pawl 84 is released from the escape wheel, this spring 81 operates to rotate the escape wheel, the verge 77 oscillating to regulate the speed of rotation. As the escape wheel is rotated through the instrumentality of the sheave 75 which rotates in the same direction with it, the pin 101 which is axially disposed on the face of the sheave moves toward the hook member 48 and, when it reaches the latter,

engages the laterally projecting L-shaped I recess of the lever 6, thereby relocking the lever.. Thus when the magneto signals the fact that there is some one calling, the lever 6 is automatically relocked after the prescribed interval of time, in the event that the incoming call is unanswered, this interval of time being that length of time that is required for the pin 101 to travel from its normal position to the point where it-contacts with and operates the hook member 48.

In the event that the ringing of the incoming call stops before the pin 101 travels from its normal position to the point where it operates the hook member 48, the magnet 51 will be .deenergized and thus permit the spring 54 to draw the lever 37 back against its pin 55. thereby opening the circuit of the magnet 56 by the separation of the lever 37 and the contact member 52. The deenergizing of the magnet 56 would permit the pawl 84 to be returned to engagement with the teeth of the escape wheel 69, were it not for the lever 106 which holds the pawl out of engagement with the teeth until the lug 103 positioned on the periphery of the sheave 75 contacts with the free end of the lever 106 to effect its disengagement from the pin 105 of the pawl 84. This lug 103 is adapted to contact with the free end of the lever 106 at the same time that the pin 101 engages the arm 49 of the hook 48. Therefore, the arm 31 is released by the hook 48 and the pawl 84 by the lever 106 at practically the same time. The pawl 84 then drops back into the teeth of the escape wheel 69 and further movement of the escape wheel is prevented.

' Assume that the telephone is answered' before the prescribed interval of time elapses after the ringing of the magneto bell. The receiver 3 is removed from the hook 2, the spring of which raises the latter, and with it the lever 6. thereby relieving the spring 81 of the tension to which it was previously subjected. The spring 7 6, which is a relatively light spring compared to the spring 81 and which was subjected to a torsional strain during theinitial movement of the escape wheel, serves to return the sheave 75 to its normal position. the pawl 7 3 attached to the sheave ratcheting over the teeth of the ratchet wheel 72 during this return movement of the sheave 75, the engagement of the verge 77 with the teeth of the escape wheel preventing the reverse movement imparted to the sheave 75 from being communicated to the escape wheel.

Taking a condition where the telephone is not answered in response to the ringing of the magneto; the lever 6 being in the lowered position and thereby tensioning the spring 81. the withdrawal of the pawl 84 by the magnet 56 allows the escape wheel to be put in motion. when the pin 101 travels toward and finally disengages the hook 48 from the arm 31. Simultaneous with the operationcof the pin 101 releasing the hook 48 from the arm 31. the lug 103 engages the lever 109 to release the pawl 84 from engagement with the projection 104 of the lever 106. thereby allowing the pawl 84 to drop back in engagement with the teeth of the escape wheel 69 and permitting all parts to resume their former condition with the exception of the spring 81 whose tension is reduced. with this condition of affairs. it is assumed that there are pins 101 in each of the holes 107 and lugs 103 secured in each of the holes 108 on the periphery of the sheave 75. The failure to answer the first incoming call results in that pin 101 which is nearest the hook 48 operating the latter to release the lever 31. the foremost lug 103 at the same time operating the lever 109 and releasing the pawl 84. A second signal of an incoming call which remains unanswered. then operates to disengage the pawl 84 as in the previous instance, when the next succeeding pin 101 and the next succeeding lug 103 operate to release the hook 48 and the lever 109 in the sameway that the preceding pin and lug operated. The number of incoming calls which may remain unanswered and yet reestablish the locking of the lever 106 after having once unlocked thesame, depends upon the number of pins 101 employed and the number of lugs 103 also employed.

By making the pins 101 removable, either one or a mnnber of these pins and the corresponding number of lugs may be employed,

thereby varying the intervals of time during which the lever 6 may remain unlocked. In this way the apparatus may be regulated to require the punctual answering of the telephone or to allow a relatively great length of time in which to answer the same.

Also the particular arrangement of the removable pins permits a relatively fair record to be made of the number of incoming calls during the absence of the subscriber. For example: If fourpins 101 are employed and two are found to have operated the hook 48 after the return of the subscriber, it will be apparent that the magneto bell hasbeen rung twice. since it will be evident that the magnet 56 has been energized in two instances to release the pawl 84 in each of these two instances to permit the spring 81 to move the escape wheel 69 through an angular distance corresponding to the angular distance between the two pins involved.

In the=case of using a plurality of pins 101 and lugs 103. the spring 76 is permitted to return the sheave 7 5 to its normal position after the lever 6 has been raised, (the spring 81 being thereby relaxed enough to relieve it of any tension) the lever 109 yielding (against the pressure of the spring 111) to permit the lugs 103 to pass it on the return of the sheave 75.

The invention having been described, what is claimed as new and useful is:

1. A telephone lock comprising in combination a manual releasing means. an automatic releasing means. and a register operable by the manual releasing means only.

2. A telephone lock comprising in combination dual manual means either of which is operable for releasing the same. an automatic releasing means. and a register operable by either of the manual releasing means but not by the automatic means.

, the receiver hook of the telephone, with the locking device connected with said member, a register connected with the locking device, a duality of manually actuatable mediums by either of which the locln'ng device may be released and the register operated, and mechanism which releases the locking device without operating the register, said 'mechanism being rendered operative by incoming calls.

5. In an attachment for telephones, a member for engaging and holding in its de pressed position the receiver hook of the telephone, locking means for said member, a duality of manually actuatable mediums either of which is operable to release said locking means and permit the member and the hook to rise on the removal of the re-. ceiver from the latter, and a device cooperating with the said locking means and with the member so that the latter may immediately lock the hook in its depressed position on the replacing of the receiver thereon,the said means being automatically returnable to normal position irrespective of the medium by which it is operated.

6. In an attachment for telephones, a member for engaging and holding depressed the receiver hook of the telephone, alocking device for the member, means operatively connected with said device to release the member independently of the receiver hook, and positive means for holding said member released except when the receiver is replaced on the hook.

7 In an attachment for telephones, a. lever for engaging and holding depressed the receiver hook of a telephone, a locking device engaging the lever, means operable from the exterior of the attachment for effecting the release of the said device from the lever independently of the receiver hook, and further means connected with the telephone mechanism whereby the signal of an incoming call will operate to release the said device for a prescribed interval of time only and irrespective of the time of duration of said signal.

8. In an attachment for. telephones, a. lever for engaging and holding depressed.

the receiver hook of a telephone, a. locking device engaging said lever, a dual manual release of aforesaid device either element of which is operative for performing the releasing function, and a time controlled autoreceiver hook depressed, a duality of manually actuatable mediums by either of which the latter mechanism may be actuated to release the lever, and means by which the said mechanism may be released for a prescribed interval of time succeeding the signal of an incoming call.

' 10. The combination with a desk telephone, of a device attachable to the base of Y the telephone, a lever carried by said device and engaging the receiver hook of the tele phone, a locking mechanism within the device and engaging the lever to hold the receiver hook depressed, a register carried in said device, connections between the register and the locking mechanism, a duality of manually operable mediums by either of which said locking mechanism may be released and the register operated at the same time, and means by which the locking mechanism may be released for a prescribed limit of time only and without the operation of the register.

11. The combination, with a desk telephone. of a casing designed to stand beside the telephone and provided with a base to underlie the telephone base, means whereby the base of the casing may be fixedly attached to the telephone base in such a way that it may be detached only from within the casing, a lever pivotally mounted in such casing and protruding therefrom so as to overhang the receiver hook of the telephone, and a manually releasable locking device engaging the lever, whereby the receiver hook is held depressed andthe telephone rendered inoperative until the release of said locking device.

12. The combination, with a desk telephone, of a casing adapted to stand beside the telephone, a crow-foot base for said casing adaptedto underlie the telephone base, the said crow-foot base being provided with a plurality of arms to one of which the easing is connected, all of said armse'xcept that connecting with the casing being provided with hooked ends which engage the telephone base, a clamping member 'detachably connected with the bottom of the casing on the interior thereof, said clamping member also engaging the telephone base, a lever pivotally mounted in the casing and protruding therefrom so as to overhang the receiver hook of the telephone, and a manually releasable locking device engaging the lever, whereby the device as a whole is. attachedto the telephone in such a way that the receiver hook is held in its depressed position and the telephone thereby rendered inoperative.

13. The combination, with. a desk telephone, of a casing adapted to stand beside the telephone and provided with a base, means whereby the base ofjthe casing may be fixedly attached to the telephone base in such a way that it may be detached therefrom only from within the casing, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking device engaging the lever, mechanical means for releasing the locking device to permit the telephone to be used for outgoing calls, and electro-mechanical means for releasing the locking device in response toan incoming call.

14:. The combination with a desk telephone, of a casing adapted to stand beside the telephone and provided with means for detachable connection thereto, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging said lever to hold the receiver hook of the telephone depressed,-a bell-crank lever pivotally mounted in the casing and operatively connected with the locking arm, and

' a duality of manually operable mediums by either of which the said bell-crank lever may be actuated to effect the release of the {ocking arm from the aforesaid lever.

15. The combination with a desk telephone, of a casing adapted to stand beside the telephone and provided with means for attachment thereto, a lever pivotally mounted in said casing and protruding therefrom so as 'to overhang the receiver hook of the telephone, a locking arm engaging said lever to hold the receiver hook 'of the telephone depressed, a bell-crank lever pivotally mounted in the casing and operatively connected with the locking arm, a register with in the casing, operative connections between the register and the bell-crank lever, and a duality of manually operable mediums by either of which the said bell-crank lever may be actuated to simultaneously effect the release of the locking arm and the operation so as to overhang the receiver hook of the telephone, a locking arm engaging the lever to hold the receiver hook depressed, mechanical releasing means for the locking arm a second lever; connected with the locking arm, and electromagnetic means where by said second lever may be operated and ehe locking arm released from the first said ever.

17. The combination, with a desk telephone, of a casing adapted to stand beside the telephone, and provided with means for detachable connection therewith, a'lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging said lever to hold the receiver hook depressed, a bell crank lever pivotally mounted 1n the casing and having connection with said locking arm, a second lever connected with said locking arm, means connected with a bell-crank lever whereby it may be operated manually to effect the release of the locking arm from the first said lever and electromagnetic means 006 erating With said second lever to also e ect the release of the locking arm from the first said lever.

18. The combination, with a desk telephone, of a casing adapted to stand beside the telephone and provided with means for detachable connection therewith, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging said lever to hold the receiver hook depressed, a bell-crank lever pivotally mounted in the casing and connected with the locking arm, a register, connections between the register and the bell-crank lever, a second lever connected with the locking arm, mechanical means whereby the bell-crank levermay be operated 'to release the lockingarm from said lever and to simultaneously operate the reg ister, and electromagnetic means connected with said second lever whereby the locking arm may be released from the first lever without the operation of the register.

19. The combination, with a desk tele- 110 phone, of a casing adapted to stand beside the telephone, and having means for detachable connection. therewith, a lever pivotally mounted in said casing and protruding therefrom so as to overhang thereceiver 115 hook of the telephone, a locking arm engaging'said lever to hold the receiver hook depressed, mechanical releasing means for the locking arm, an electromechanical release for the-locking arm, and an electromechan 120 ical timing device conjoined with the electrome'chanical release, whereby said locking arm may be restored, to engagement with the said lever after a prescribed. in I terval of time. I 125 20,-The combination, with a desk 'telephone, of a casing adapted to standbeside the telephone, and provided with means for detachable connection therewith, a lever pivotally mounted in said casing and pro- 130' truding therefrom so as to overhang the receiver hook of the telephone, a locking armengaging said lever to hold the receiver hook depressed, releasing means for said locking arm, a timing device for restoring the locking arm to engagement with the lever, and means contained in, the timing device whereby the interval of time required for its operation may be varied.

21. The combination with a desk telephone of a casing adapted to stand beside the telephone and provided with means for attachment thereto, a lever pivotally mounted in the casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging the lever to hold the receiver hook depressed, a bellcrank lever pivotally mounted in the casing and engaging the locking arm, and a dual-' ity of manually actuatable mediums by either of which the said bell-crank lever may be operated to release the locking arm from the aforesaid lever, both of said mediums having exteriorly exposed operating means.

22; The combination, with a desk telephone, of a casing adapted to stand beside the telephone and provided with means for attachment thereto, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging the lever to hold the receiver hook depressed, releasing means for said locking arm, a timing device for restoring the locking arm in engagement with the lever, and a tensioning device connected-with the lever whereby motion is imparted to the timing device.

23. The combination, with a desk telephone, of a casing adapted to stand beside the telephone and provided with means for attachment thereto, a lever pivotally mount- 1 ed in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging the lever to hold the receiver hook depressed, releasing means for said locking arm, a timing device for restoring the locking arm to engagement with the lever, a tensioning device connected with the lever whereby motion is imparted to the. timing device, and means contained in the timing device whereby the interval of time required for its operation may be varied.

24. The combination, with a desk telephone, of a casing adapted to stand beside H the telephone and provided with means for attachment thereto, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone,'the casing being provided with an opening of a width greater than the thickness of the lever, the said openin having a recess formed in its bottom e ge, a

l'ooking arm engaging the lever when the latter is. in said recess,the lever comprising two parts hingedly connected together, so that one may move laterally, andan arm connected with the laterally movable part of the lever whereby, when the receiver of the telephone is on its hook, the laterally movable part of the lever may engage in said recess to hold the receiver hook depressed, and means for effecting the release of the locking arm from the lever.

25. The combination, with a desk telephone, of a casing adaptedto stand beside the telephone and having means for attachment thereto, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging the lever to hold the receiver hook depressed, a pivotally mounted hook member within the easing, means for releasing the locking arm so that it may be engaged by the hook member, and means for tripping the hook member from release with the locking arm.

26. The combination, with a desk telephone, of a casing adapted to stand beside the telephone and provided with means for attachment thereto, a lever pivotally mounted in said casing and protruding therefrom so as to overhang the receiver hook of the telephone, a locking arm engaging the lever to hold the receiver hook depressed, a bell-crank lever pivoted in the casing and having connection with the locking arm, a second lever connected with said locking arm, a hook member pivotally mounted in the casing, mechanical means for rocking the bell-crank lever to effect the release of the locking-arm and effect its engagement by the hook member, electromagnetic means for'eflecting the release of the locking arm and effecting its engageinent by the hook member, a member carried by the first said lever to release the hook member from engagement with the locking arm, and a timing device having means for releasing the hook member from engagement with the locking arm.

the said aperture having a recess formed at its bottom, a locking arm engaging the lever to hold the receiver hook depressed when the lever is in saidirecess, an arm, connected to the free end of the lever and engageable by the telephone receiver t0'position the lever for engagement in said recess,

a bell crank lever pivoted in the casing and having engagement with the locking arm, a second lever connected with the locking arm, mechanical means for operating the bell crank lever, electromagnetic means for op erating the said second lever, a hook pivotally. mounted in the casing and adapted to engage the locking arm, whereby, when either the second lever'or the bell crank lever are operated the hook may engage the locking arm, and a timing device having means for engaging the hook to effect the release of the latter from the locking arm.

28. The combination, with a desk telephone, of means for locking the receiver hook of the telephone in its depressed position, an electro-mechanical release for said .means, and a device for relocking said means after a prescribed interval of time, said device comprising a rotatably mounted escape wheel, a weight controlled verge engaging the escape wheel, a rotatably mounted sheave, means whereby rotary movement may be imparted to thevsheave both right-handedly and left-handedly, connections between the sheave and the escape wheel so that the latter may be rotated by the sheave when moving in one direction but held stationary when the sheave moves in the other direction, mechanism for releasing the escape wheel and arresting its movement, and devices carried by the sheave and cooperating with the aforesaid locking means.

29. A telephone switch lock comprising means for locking the telephone switch lever in one-position, means for unlocking said lever, and means for re-locking it after a predetermined interval.

30. A telephone switch lock comprising means for locking the telephone switch lever in one position', electrically operated means for. unlocking said lever, and means for relocking it after a predetermined interval.

31. A telephone switch lock comprising means for locking the telephone switch lever in one position, means for unlocking said lever, and electrically released mechanical means for re-locking it after a predetermined interval.

32. A telephone switch lock having a switch lever engaging member, a locking device engaging the latter, dual manual means operative singly for releasing the said device independently of the switch lever, and an automatic releasing and time controlled relocking mechanism therefor.

33. A telephone switch lock having means for locking the switch lever of a telephone,

an automatic release for said means responsive to an incoming call,'- and time controlled mechanism for automatically relocking the said means if such incoming call is not answered.

34. A telephone switch lock having means for locking the switch lever of a telephone, a positive automatic release for said means responsive to an incoming call, and mechanism for automatically relocking the said means if such incoming call is not answered within a predetermined interval.

35. A telephone switch lock having switch lever engaging member, a locking device for said member, a dual manual release for said device, an automatic release there for, and a time controlled automatic relocking means for the same.

36. A telephone switch lock having means for locking the switch lever of a telephone, a singly operable double unit release for said means, an automatic release therefor, and a time controlled relocking mechanism for the same. p

37. A telephone switch lock consisting of a locking member for the switch lever of a telephone, manual unlocking means for said member, and an automatic unlocking and time-controlled relocking mechanism for the same.

38. A telephone switch lock consisting of a locking member for the switch lever of a telephone, an automatic releasing and relocking mechanism for said member, and

means carried by the said mechanism for varying the interval of time occurring between the releasing and relocking operations.

39. -A device for locking telephones comprising a locking member for the switch lever of a telephone, a dual manual release for the member operable for outgoing calls, an automatic release operable on incoming calls, and a time controlled relocking mechanism for the member operatively connected with the automatic release.

40. A device for locking telephones comprising a locking member for the switch lever of a telephone, a dual manual release for the member operable for outgoing calls, an

automatic release operable on incoming calls, a time controlled relocking mechanism for the member operatively connected w1th the automatic release, and meansfor varying the intervals of time occurringbetween the operation of the automatic release and manually released, an automatic release for the locln'ng member, and a time controlled relocking mechanism for the same operatively connected with the automatic release.

43. A device for locking telephones comprising a switch lever locking member, a dual manual singly operative release for the same requiring the removal and replacement of the receiver for the relocking of the member, and an automatic'releasing and time-controlled relocking mechanism for the member, the relocking operation of which is prevented by the removal of the receiver from its hook.

- 4.1L. A device for locking telephones comprising a receiver hook locking member, multiple releasing means therefor operative independently of the receiver hook, and positive means for retaining the member in unlocked position except when the receiver is on the said hook.

45. A device for locking telephones comprising a switch lever locking member, an automatic release therefor, and means for operating said release, the said means being responsive to incoming calls and detachably secured to the telephone equipment for operation thereby.

A6. A telephone locking device comprising a switch lever locking member, an automatic release for the same, an automatic relocking mechanism therefor, and means mechanically derived from the telephone equipment and operatively connected with the automatic release and the automatic relocking mechanism.

47. A telephone lock comprising means for locking and unlocking a telephone switch lever, and means independent of said switch lever for retaining said first means in unlocked position. 48. A telephone locking device comprising a switch lever locking and unlocking mechanism, and positive means contained in said mechanism for retaining the same in unlocked position to permit the receiver hook to be oscillated without relocking.

49. A telephone locking device comprising a switch lever locking and unlocking mechanism, and means contained in said mechanism for retaining the same in unlocked position to permit the receiver hook to be oscillated without relocking.

50. A telephone lock including a switch lever locking and unlocking device, and means for operative engagement by the telephone receiver for retaining the said device in unlocked position independent of the receiver hook.

51. A telephone lock comprising means for locking and unlocking, a telephone switch lever, means independent of said switch lever for retaining said first means in unlocked position and a receiver controlled release for said retaining means.

meaeca 52. A telephone lock having a device for locking the switch lever of the telephone in one posit-ion, releasing means for the said device, a time-controlled relocking mechanism therefor, and a switch lever controlled energizing medium for the relocking mechanism.

53. A telephone lock having a device for locking the switch lever of a telephone in one position, an automatic releasing means for the said device, a time-controlled relocking mechanism therefor, and a switch lever controlled energizing medium for the relocking mechanism.

54. A telephone lock including a switch lever locking member, a release for the same, a relocking mechanism therefor, and means operatively connecting the relocking mechanism with the said locking member for storing energy to operate the relocking mechanism when the locking member is in locked position.

55. A telephone lock including a switch lever locking member, a release for the same, a relocking mechanism therefor, and an energizing medium for the relocking mechanism, the said energizing medium being rendered operative when the locking member is in locked position but rendered inert when the said locking member is in unlocked position.

56. A telephone lock including a switch lever locking medium. a release therefor, means for automatically relocking the said medium at the expiration of a predetermined interval of time after release, and an actuating device 'for said means.

57. A telephone lock including a switch lever locking medium, a release therefor, means for automatically relocking the said medium at the expiration of a predetermined interval of time after release, and an actuating device for said means, the said clevice being operatively connected with the said locking medium.

58. A telephone lock having a switch lever locking medium, a release for the same, a time-controlled relocking means therefor, and an actuating device for the relocking means operatively connected with the locking medium.

59. A telephone lock having a switch lever locking medium, a release 'for the same, a time-controlled relocking means therefor, and a resilient actuating device for the relocking means.

60. A telephone lock having a switch lever locking medium, a release for the same, a time-controlled relocking means therefor, and a resilient actuating device for the relocking means, the energy of the resilient relocking device being rendered potential when the said locking medium is in locked position.

61. A telephone lock comprising a switch 130 lever locking means, a release for said locktime-controlled relocking mechanism, and ing means, and a combined time-controlled means for varying the time element in the locking and incoming call indicating mechatime-controlled mechanism. 10 nism operatively connected With said lock- In testimony whereof they aflix their sig 5 ing means. natures.

62. A telephone lock comprising a switch CHARLES BAUM.

lever locking medium, a release therefor, a EDGAR H. TALBERT.

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