Patented July 6, 1926. 1,591,791
UNITED STATES PATENT OFFICE.
CARLTON H. SPROUT, OF PHILADELPHIA, PENNSYLVANIA.
ADJUSTABLE LAMP BRACKET.
Application filed September 1,1922, Serial Ho. 585,703.. Renewed May 21, 1928.
This invention relates to adjustable electric lamps, and the principal object is to produce a device of this nature which may be instantly adjusted to any desired posi8 tion or angle and which will be automatically held in adjusted position.
Another object is to provide simple and novel supporting means and joints permitting universal adjustment. 10 Another object is to produce a device of this nature having a novel arrangement of weight compensation for holding the devices in adjusted position.
Another object is to construct a device of 15 this nature which should be simple of construction and operation, and highly efficient for-the purpose for which it is designed.
Another object is to construct a simplified and extremely cheap and efficient knuckle 20 joint for supporting the lamp proper.
With these and other objects in view, which will be more clearly noted as the specification proceeds, the invention resides in certain novel features of construction and 25 combination and arrangement of parts, the essential elements of which are hereinafter fully described, are particularly pointed out in the appended claims, and are illustrated in the accompanying drawing in which: 30 Figure 1 is an elevational view of my adj ustable lamp bracket.
Figure 2 is a view of a modified form of base.
Figure 3 is a perspective view of one of 35 the knuckle joint elements.
Figure 4 is a fragmentary top plane view of the swivel device.
Figure 5 is a vertical Sectional view taken on the line 5—5 in Figure 4. 40 Figure 6 is a transverse sectional view taken on the line 6—6 in Figure 4.
Like characters of reference refer to like parts in all views. Eeferring ^to the drawings in detail, 10 45 represents a main tubular support or pedestal of the lamp which may be provided with a base 11 as shown in Figure 1 when the lamp is to be supported from the floor or ceiling. When the lamp is to be supported from a 60 table, bench, or the like a clamp 12 as shown in Figure 2 of the drawings may be substituted for the base 11.
Threadingly engaging the upper end of the tube 10 is a bell-shaped member 13 pro65 vided on its upper face with an annular flange or shoulder 14. A swivel head 15 is
supported by the member 13, said swivel head being provided on its lower face with an annular shoulder 16 embracing the shoulder 14. A bolt 17 carrying a spring 60 element 18 at one end passes through a portion of the head 15 and through a plate 19 secured in the bell-shaped member 13. The spring 18 tends constantly to hold the. members 15 and 13 in close engagement by 60 permitting the free rotation of one on the other.
An electric conduit 20 carrying the necessary electric wires 21 enters the base and passes up through the tubular stem 10 into TO the bell-shaped member 13 where the wires are connected to respective binding screws 22 which pass through a disc of insulation 28 and into contact rings 24.
A block of insulation 25 'is mounted in the W base of the member 15 and carries contact rings 26 which engage respectively with the aforementioned contact rings 24.
Binding posts or screws 27 connect with the contact rings 26 and to these lead wires 80 28 are attached which pass up through the member 15 to binding posts 29 mounted in a vertically disposed block of insulation 30, said binding posts passing through the insulation 30 and into contact rings 31. 8B
The vertical face of the swivel head 15 is provided with ah annular shoulder 32 within which fits the annular rib or shoulder 33 of a rbtary member 34. The member 34 carries a disc of insulation 35 upon which the SO contact rings 36 are mounted, said contact rings being connected to binding posts 37 to which the ends of wires 38 are secured. The wires 38 pass through a conduit 39 which passes out through a side aperture 98 40 in the member 34.
A bolt 41 passes through the members 15 and 34 so as to hold the shoulders 32, and 33 in engagement, said bolt being provided with a spring tension member 42. 100
One bar 43 of a pair of lazy-tongs is securely attached to the member 34 by screws 44 or other suitable means and the bolt 41 passes through this bar and through the outer bar corresponding thereto on the lazy- 105 tongs. The lazy-tongs are indicated generally at 45—Figure 1—and have two noticeable features. First, they extend on both sides of the pivot bolt 41 and are provided in rear of said bolt with a pair of weights 46 no so that as the forward end is moved forwardly the weights will be moved a proportional
distance rearwardly and will always serve to exactly counter-balance the weight in front of the pivot. The second noticeable feature is the means by which the front end 5 of the lazy-tongs is connected with the lamp per se.
The lamp and socket are indicated at 47 and are provided with a collar 48 and an upwardly extending supporting member 49. 10 The joint between the member 49 and the lazy-tong is composed of a pair of members of identical formation, one of which is shown in Figure 3 and indicated by the numeral 50, the body being provided with four equal
15 ly spaced ears 58, the diametrically opposite ears being bent in the same direction and one pair of ears being bent in the opposite direction from the other pair. Each of the ears is provided with an aperture 52 the
20 apertures of each pair of ears coming in alignment upon completing the bending operation. Two of these members 50 are secured together at 52 so as to have relative movement in a horizontal plane, the other
2* ears of one member 50 being secured at the final pivot 53 of the lazy-tongs, and the ears of the other member 50 being pivotally secured to the members 49 at 54. From the above description it will be read
30 ily seen that the entire device may be swung in a horizontal direction about the axial line of the standard 10, that it may be rotated in a vertical plane about the axis 41, that it may be extended by means of the lazy
35 tongs 45 and that the lamp 47 may -be then adjusted with relation to the work by reason of the joint made by the two members 50, and that in all positions the springs 18 and 42 and the counter-weights 46 will tend to
40 hold the various parts in the adjusted position to which they are moved. The springiness of the ears 51 is also relied on to assist in this.
While I have described what I deem to be 45 the most desirable embodiment of my invention, I do not limit myself to the specific
details of construction of material, nor to any thing less than the whole of my invention as defined by the appended claims. What I claim:— «o
1. In an adjustable lamp bracket, the combination of a pedestal support, a bell-shaped member carried at the upper end of said pedestal support and comprising a pair of sections connected for rotary movement, an 68 upright rising from the upper rotatable section of said Dell-shaped member, a second member carried by said upright and composed of a pair of sections one of which is rotatable relative to the other, said latter <W section being rotatable about an axis disposed at right angle to the axis of rotation of the sections of the bell-shaped member,
a lazy-tong structure carried by the rotary section of the second mentioned member, 85 counter-balancing weights at one end of the lazy-tong and a lamp structure carried at the other end of the fazy-tong.
2. In an adjustable lamp bracket, the combination of a pedestal support, a bell-shaped TO member carried at the upper end of said pedestal support and comprising a pair of sections connected for rotary movement, an upright rising from the upper rotatable section of said bell-shaped member, a second 75 member carried by said upright and composed of a pair of sections one of which is rotatable relative to the other, said latter section being rotatable about an axis disposed at right angles to the axis of rotation 80 of the sections of the bell-shaped member, a lazy-tong structure carried by the rotary section of the second mentioned member, counter-balancing weights at one end of the lazy-tong and a lamp structuie carried at 85 the other end of a lazy-tong, and electrical circuit closing switches carried by said bellshaped member and the second member supported from the upright on the bell-shaped member. *>
In testimony whereof I affix my signature.
CAELTON H. SPROUT.