US 1780173 A
Beschreibung (OCR-Text kann Fehler enthalten)
NOV. 4, 1930. i 1 M, CROWE 1,780,173
PORTABLE TOOL J. M. CROWE PORTABLE TOOL Nov. 4, 1930.
Filed sept. sheets-sheet 2 Nov. 4, 1930. f J. M. cRowE 1,780,173A
PORTABLE TOOL Filed Sept. 25, 1922 l 3 Sheets-Sheet 5 Patented Nov. 4, 1 930 UNITED STATES PATENT OFFICE JOHN I. CROWN, .OF COVINGTON, KENTUCKY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO
THE STANLEY WORKS, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON- NECTICUT PORTABLE TOOL Application 1ed September 25, 1922. Serial No. 590,553.'
This invention relates to improvements in a motor operated tool for sawing, cutting,
builing, grinding, etc., and more specially to a tool of this kind which can be conveniently supported and manipulated in the hands of the operator.
The objects of this invention are to provide a portable tool with exchangeable discs 4for sawingfcutting, buiiing, grinding, etc., l0 such discs being mounted in such a manner as to rotate in a plane substantially parallel to the axis of the motor, thereby affording convenient application of the tool to the work and giving easy access to otherwise inaccessible areas; to provide convenient means for the handling of the motor and the driven arts and for directing the same along the pat of its operation; to provide a guard for the attachment, which guard normally covers the attachment and is easily withdrawn upon application of the tool to the work; to provide means for guiding the cuttin edge of the tool along the proper path; ang to provide convenient location for the switch'controlling the operating motor and to provide also means for Ventilating the motor in its casing.
A still further object of this invention is to provide an improved driving connection between the driving and driven gears and also an improved means of Amounting the driven pinion upon which is detachably secured the attachment for performing a certain class of work.
Other objects will be apparent from the following description and claims, when considered to ether with the drawings.
Fig. 1 siows my improved device in side elevation, this form of device comprising the form of uard used in connection with the saw attacment, which guard is indicated in its two positions in full and dot and dash lines; Fig. 2 is a plan view of this form of device; Fig. 3 is a detail view of the guide 5 attachment; Fig. 4 is a longitudinal sectional view taken on line 4.-4 of Fig. 2; Fig. 5 is a longitudinal sectional view taken on line 5-5 of Fig. 1; Fig. 6 is an enlarged detailed view of part of Fig. 5 showing my improved means for mounting the driven gear and the attachment 'secured thereto; Fig. 7 shows in side elevatlon my improved device in which there lis employed a modified form of guardfor use in connection with other attachments such as buersand the like; Fig. 8 is a plan view of the same; and Fig. 9 is a detail view of the guard.
' The electric motor 1 which is of substantially circular cross section, is snugly housed within the correspondingly formed casing 2, which has the screw plug closure 3 with ventilating openings 4, other Ventilating openings 5 being provided in the main casing wall. Screw pins 6 have threaded engagement in the bosses 7 formed on the casing wall while their inner ends 8 are of plain form to serve as dowel pins for engagement in openings in the motor wall with which the pins are adapted to register, as clearly indicated in the drawings. The casing 2 is further provided with integrally formed and oppositely disposed handles 9 to provide convenient means for the handling of the tool by the operator. Socket 10 is provided in the rear end portion of one of the handles for the electric wires 11, the switch button 12 being easily manipulated by the finger and thumb portion of the opcrators hand.
The casing is provided also with the bearing portion 13 and the integral extending arm portion 14, which is further provided with bearing members 15 and 16. The casing 2, arms 9 and arm 14 are preferably formed as a single casting. The bearing 13 serves to support the forward end of the motor, While the shaft 17, which is driven by the motor, has its forward end supported in the bearing 15. The beveled pinion 18, which is fixed upon the shaft 17, meshes with the bevel ear 19 for driving the same. The gear 19 is eely mounted upon the stud 2O which has its one end screw threaded, as indicated at 21, in the bearing member 16. The gear 19 rests upon the shoulder portion 22 carried by the stud 20 and the faced portion 23 of the bevel gear 19 is adapted to receive and support the disc attachment 24 which is secured in such position by means of the left-hand threaded member 25. The nut 25 is provided with openings 26 for application and reyum moval of the same and because of the lefthand thread the accidental loosening of the disc 24 is prevented u n application of the tool to the work. T e lock membery 27 is screwed upon the other end of the stud 20 and is secured in such locked position by lmeans of the screw 28 which engages the by means of the screw 29. This guard mem ber com rises thecircular side walls 30* and 30", an the substantially semi-circular top portion 30 which-is cut out at the points 30*I and 30 to rovide openings'to permit the operator to ollow and direct the cutting operation of the tool. The one side wall 30b of the guard is provided with the slot 31 through which extends the screw 32 secured in the arm 14, this arrangement constituting means of limiting the swinging or pivotal movement of the guard. The coil spring 33 has its-one end secured to the arm 14 as indicated at 34, and its other end secured to the inside of the wall 30", the normal tendency of this spring being to force the guard to closed position so as to fully cover the saw. U on application of the free or lower edge o the saw, however, to the work, the contact of the front edge 35 with the work will automatically turn the uard about its pivot against the tension o? the spring 33 so as to raise the same just suiciently to permit the travel of the saw along the path of operation. Then upon removal of the tool from the work, the guard will automatically return to its closed or fully guarding posltion. As above pointed out, the disc saw 24 can be removed and other attachments substituted therefor and secured in position in the same manner. Such discs ma for instance, consist of flexible emery c oth which may be flexed by applying the same to the work so as to better enable the o erator to operate upon otherwise inaccessi le areas, such as corners and the like. Buers of cloth or other suitable material, brushes of either bristles or wire, and many other forms of attachments, such as carborundum discs and the like, may be substituted in the same arrangement as just described, according to the class of work which it is desired to perform. In most cases, where the use of the certain attachment does not necessitate the guarding of the hands of the oplerator against the danger of contact with t e edge of the attachment, the form of guard shown vin Figs.
7, 8 and 9 may be substituted for that shown in the first form of device in which the saw disc or like attachment is used. The second form of guard device comprises a curved shield 36 extending through about 120 and secured upon the arm 14 by means of screws 37 and 38 which engage the lower portion of the side wall 39 of the guard. The wall 36 is cut away for about half of its width, as indicated inthe drawing, so as to facilitate the application of the same to the arm 14 so as to'occupy the position indicated.
The graduated arm 40 may be detachably clamped to the lower edge of either of the side walls 30, 30b by means of the screw 41, and the guide finger 42 is adapted to be adj usted to any desired position along the arm 40 and locked in such position by means of screw 43. The indications on the arm 40 represent measurements from the edge of the saw or other cutting attachment, and the finger 42 upon being set at the point corresponding to the measurement between the edge of the work and the ,contemplated cutting line, will be held against and moved along the edge of the work during the cutting operation. Thus, the saw 4for instance is properly guided along the contemplated cutting line.
Thus, it will be seen that I have devised a portable tool which can be conveniently and easily handled by the operator and in which the operating attachment, that is the saw disc or the like, rotates in a plane substantially parallel to the axis of the main operating shaft of the motor. This particular arrangement adds greatly to the facility with which the tool can be applied to the work and with which its operation can be followed and directed by the operator. Other advantages flowing from this invention will readily suggest themselves to those who are skilled in the art to which it relates.
What I claim isz- 1. A portable tool of the class described comprising an operating shaft, an attachment for treating the work and operated by said shaft in a plane substantially parallel to that of said shaft, a guard for said attachment movable to uncover the same for engagement with the work, and means carried by said guard for guiding the attachment along the contemplated line of treatment, said tool being ada ted to be supported and directed manually y the operator along the path of travel.
2. A portable hand tool of the class described, comprising an operating shaft, an attachment operated by said shaft for treating the work, a guard for said attachment movable to uncover the same for engagement with the work, and Ymeans carried.J by said guard and adapted for arrangement on either side of said attachment for guiding the same along the contemplated line of treatment.
3. In a portable power driven hand saw adapted to be applied bodily to and moved along the work by the operator, a frame, a rotary saw blade operatively mounted at the front thereof, a motor on said frame rearwardly of and having driving connection with said blade, blade-guarding means pivoted to the frame between the blade and the motor and movable about said pivot in the plane of the blade to advance or retreat to guard or expose a cutting portion of the blade and having a ortion adapted to travel along the work, and automatic means eRective in all tool` ositions and tending to advance said guar ing means.
4. In a portable power driven hand saw adapted to be applied bodily to and moved along the work by the operator, a frame, a rotary saw blade operatively mounted at the front thereof, a motor on said frame rearwardly of and having driving connection with said blade, blade guarding means ivoted rearwardly of the axis of the saw lade and movable about said pivot in the plane of the blade to advance or retreat to guard or expose a cutting portion of the blade and having a portion adapted to travel along the work, and automatic means eiective in all tool positions and tending to advance said guarding means.
In testimony whereof I hereby aix my signature.
JOHN M. CROWE.