US1189413A - Adjustable electric-lamp support. - Google Patents

Description

A, E. WELLS. ADJUSTABLE ELECTRIC LAMP SUPPORT.

APPLICATION FILED NOV-23, 1914.

1,189,413. Patented July 4,1916

Witnesses. inventor.

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ARTHUR E. WELLS, OF TORONTO, ONTARIO, CANADA.-

ADJUSTABLE ELECTRIC-LAMP SUPPORT.

Specification of Letters Patent.

Patented Jur 4-, 1916.

Application filed November 23, 1914. Serial No. 873,450.

To all whom it may concern:

' Be it known that I, ARTHUR E. WELLS, a subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and usefulImprovements in Adjustable Electric- Lamp Supports, as described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the invention are,

to allow of the quick and easy adjustment of the lamp to various positions-so as to bring the light to the desired place, and to devise a simple form of adjustable electric lamp support particularly adaptable for use in drafting oflices or other places where the frequent changing of the position of the light is necessary.

A further and important object is to devise a structure in which the lamp may be adjusted horizontally and maintained at a uniform height or may be adjusted vertically as desired. I

The principal feature of the invention consists in the novel construction and arrangement of parts whereby the lamp is adjustably suspended from a trolley member traveling upon a laterally arranged pivotal arm.

In the drawings, Figure 1 is an elevational view of the invention showing the lamp supporting trolley in dotted lines in an outward position. Fig. 2 is an end elevational view of the pivotal bracket showing the trolley thereon. Fig. 3 is a'horizontal section through the line w?; of .Fig. 1. Fig. 1 is a vertical sectional elevational view of the adjustable member carrying the lamp.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1 is a plate adapted to be secured to the ceiling in the desired position having a hollow stem 2 ex tending downwardly from the center and supporting at its lower endan electrical fitting 3 in which suitable electrical terminals are arranged, the wires leading thereto through the hollow stem 2.

'4 is a member rotatably supported upon the hollow stem 2 and here shown formed in two half sections adapted to be placed around said stem.

5 are grooves formed in the outer sides of the member 4 'at'its outer end into which the upperends of a metal frame 6 are rigidly secured. The frame 6 is preferably formed of a length of flat metal rod doubled at the outer end 7 and having the ends 8 bent upwardlyiand secured to the member 1, the said frame extending downwardly and laterally from the rotatable support in an'angular direction, the sides thereof being parallelly arranged.

9 is a trolley, formed of a large roller 10 having the side flanges 11, adapted to run upon the sides of the frame 6, the central portion thereof being grooved to receive the electric cords leading to the lamp.

12 is a U-shaped bar supported on the outer ends of the pin of the roller 10 and 1 extending outside of the side bars of the frame 6, the open end thereof extending below the lower edge of said sides and carrying a grooved roller 13 which is formed with the end flanges 14: adapted to engage the underside of the sides of the frame 6.

The flexible electric cable 15 leading from the fitting 3 issecuredin an insulated block 16 secured to the rotatable member 4% between the sides of, the frame 6and a suitable amount of slack is allowed between said block and the fixture to allow the free swinging of the device. The cable extends between the sides of the frame 6 over the roller 13 and extending downwardly therefrom in a loop, it returns around the grooved roller 10 from the outer side. V

17 is a grooved roller or sheave arranged in the loop of the cable between therollers 10 and 13 and carrying a frame 18 which extends to each side thereof. The frame 18 is formed with an inverted U-shaped central portion 19 which is rotatably supported on the pin 20 of the roller 17. The frame extends from the bottom ends of the inverted U-shaped portion laterally outward and is turned upward forming the spring sides 21, the extremities 22 of which are turned inwardly.

23 and 24: are insulated ferrules arranged in the bottom and top portions of the spring sides 21.

25 is a cross arm supported on the upper end of the U-shaped portion 19 of the frame 18, being formed of insulating material and extending outwardly over the ferrules 2 1- and having the holes 26 therein arranged each side of the center.

Separate cords of the cable 15 are passed through the holes 26 in the cross arm 25 and through the ferrules 23 and 24C and at the lower terminal ends they are connected to any suitable lamp which may be of any suitable design and which is not here shown.

The holes 26 are so arranged that the spring sides of the frame 18 hold the ferrules 24 in a light gripping contact against the wires pinching them slightly against the outer sides of the holes 26 and thus holding the wire.

When it is desired to raise or lower the lamp the sides of the frame 18 are sprung inwardly by grasping between the finger and thumb and the said frame is shifted up or down to move the lamp to the desired position, the movement of the frame 18 letting .out or taking up the slack in the cable extending around the roller 17. This vertical adjustment of the lamp is not frequently required but its position otherwise may be altered either by rotating the pivotal member carrying the trolley or by moving the trolley on its trackway. In order to move the trolley on its trackway, it is merely necessary to grasp the lamp or the cable suspending same and pull it in the direction desired. This will cause the trolley to travel up or down the inclined pivotal frame but the horizontal position of the lamp will -not be altered as the angle of incline is so arranged as to compensate with the distance of outward travel and to take up the slack in the cable as the lamp is moved outwardly or to increase the slack as the trolley is moved inwardly thus maintaining the lamp in the same horizontal plane.

It will be seen that with this lateral adjustment upon the pivotal arm, the lamp may be readily shifted to any desirable position and it may be raised or lowered very easily and quickly and will be securely maintained in any position without the use of fastening means of any kind.

In shifting the position of the lamp horizontally it is found that the trolley may be operated to move upwardly upon the arm 6 by pulling downwardly on the perpendicular portion of the cord 15 between the roller 13 and the sheave 17 and in order to move the trolley outwardly a downward pull upon the cord extending between the sheave 17 and the roller 10 has the desired effect.

WVhat I claim as my invention is,:

1. An adjustable electric lamp support, comprising, a supporting arm arranged in an inclined position, a trolley adapted to travel on said inclined arm, and a lamp supporting cord fixed at its upper end and ex tending over said trolley to effect an automatic compensation of the length of the cord to maintain the lamp in a substantially horizontal plane.

2. An adjustable electric lamp support, comprising, a supporting arm arranged in an inclined position, a trolley adapted to travel on said inclined arm, and having a pair of rollers, a lamp supporting cord fixed at the upper end and extending over one of said rollers and forming a depending loop and passing over the other roller and extend ing downwardly and supporting the lamp, a sheave arranged in said depending loop, and a member carrying said sheave and engaging the depending terminal end of said cord.

3. An adjustable electric lamp support, comprising, a supporting arm arranged in an inclined position, a grooved roller adapted to travel on said arm, a frame carried by said roller, a secondary grooved roller carried by said frame, a cord fixed at its upper end and passing over said secondary roller and forming a depending loop and extending around the main roller and depending centrally of said loop, a frame adjustably secured on the depending end of said cord, and a sheave journaled in said frame and engaging the depending loop of the cord.

4. An adjustable electric lamp support, 105 comprising, a supporting arm arranged in an inclined position, a trolley adapted to travel on said inclined arm, a cord fixed at its upper end and extending over said trolley and formed with a depending loop, a frame 110 carrying a sheave engaging said loop and formed with spring sides having ferrules at the top through which branches of the depending cord extend, and a plate secured to said frame having holes through which 115 said branches extend, said plate being arranged immediately above the movable ends of the spring frame.

5. An adjustable electric lamp support,

comprising, a fixture adapted to be secured A to the ceiling, an arm forming a double trackway carried by said fixture and extending in adownward incline therefrom, a grooved roller having flange surfaces riding on said trackway, a frame carried by said roller and extending below said arm, a roller journaled in the lower end of said frame below said trackway and having flanges engaging said trackway, a cord fixed at its upper end and extending over the lower roller 1m of said trolley and depending in a loop and York, Province of Ontario, in the Dominion extending over the upper trolley roller from of Canada, this 19th day of Nov., 1914.

the outer side and depending centrally of said loop, a frame adjustably secured to the ARTHUR WELLS' depending end of said cord, and a sheave Witnesses: rotatably arranged in said frame. E. HERON,

Signed at the city of Toronto, county of A. G. KELLY.

Oqiea of this patent may be obtained for five cents each, by addressing the Commissioner at I'ateata,

Washington, D. G."

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