US439100A - stahl de boer - Google Patents

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(No Model.) 2 Sheets-Sheet 1( U. H. STAHL DE BOER. SPRING DEVIGE FOR HANGING LAMPS No. 489,100. Patented Oct. 28. 1890.

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, U. H. STAHL DB BOER.

SPRING DEVICE FOR'HANGINGLAMPS, 8w.

No. 439,100. Patented Oct. 28, 1890.

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UNITED STATES PATENT OFFICE.

UBBO HEINRICH STAHL DE BOER, OF BERLIN, GERMANY.

SPRING DEVICE FOR HANGING LAMPS, 84.0.

SPECIFICATION forming part of Letters Patent No. 439,100, dated October 28, 1890.

Application filed March 28, 1 890- To all whom it may concern.-

Be it known that I, UBBo HEINRICH STAHL DE BOER, of the city of Berlin, in the German Empire, have invented a certain new and Improved Adjustable Spring Suspending Device for Hanging Lamps and other Objects, of which the following is a specification.

My invention relates to an adjustable spring suspending device for hanging lamps and other objects in which two spirally-bent leafsprings are employed for suspending objects in such manner that the lower ends of the said springs are drawn down between two rollers arranged near each other, so that the same by means of the weight of the suspended object are brought outof their spiral form and compelled to assume a straight or rectilinear form. An appropriate arrangement of the rollers renders it possible to retain the suspending device automatically in any desired position.

In the accompanying drawings, Figure 1 is a vertical section on the line A A in Fig. 2. Fig. 2 is a vertical section on the line B C D- E in Fig. 1. Fig. 3 is a side view of the suspending device with the spiral springs extended; Fig. 4, a side view of the T-piece which carries the aforementioned rollers, and Fig. 5 is a horizontal section on the line E G in Fig. 2.

a a are the side walls of the frame inclos ing the suspending mechanism. These side walls a. a are connected at the upper ends by means of a cross-piece b,which can be simultaneously employed by means of a hook or ring fixed to or made of one piece with the cross-piece b for hanging the suspending de vice to the ceiling of the room or otherwise.

At their lower ends the side walls a a are provided with slots 0, which diverge from each other upward and serve as guide-slots for two friction-rollers. These friction-rollers d gear with their journals d into the slots 0 and are carried by a T-piece e, depending from a bolt f, which connect the two side walls near the middle of the same. The ends 9' of two spiral springs g are drawn down between the two rollers 01 and are connected by means of a suitable forked piece h. The

forked piece it is provided with a boring t'for receiving the upper hook of a rod or chain It,

Serial No. 345,630, (N 0 model.)

to the lower end of which the object to be suspended is attached.

The new spring-suspending device is specially adapted for suspending chandeliers,

hanging lamps, and the like, and is inclosed.

by a suitable sheet-metal casing H, so that the mechanism is hid from sight. The rod or chain 70, from which the lamp or other object is suspended at suitable distance from the ceiling, can also be inclosed in an appropriately-decorated tube Z, which can be attached to the walls a a of the device or to the casing of the same. The length of the tube Zmust be so. decided that the ends g of 'the spring 9 or the fork h do not protrude from the end of the tube Z when the springs g are extended to their full extent-that is, until the same have been drawn down until the stops g come in contact with the rollers 01.

The rollers m are arranged in the walls a a,

in order to keep the straight disused parts of 4 the springs g from contact with the exterior of the rollers cl, so that the same are in no way hindered in their revolution. The-strength of the springs g must be chosen according to the weight of the lamp to be attached to the same. Four various sizes of suspending devices will suffice for all ordinary hanging lamps, which vary in weight from eight to thirty pounds.

The operation of the suspending device is as follows: If a lamp is hung onto the rodor chain is, the weight of the same will tend to draw the springs g between the rollers d and straighten the same. The downward pressure thus exerted on the rollers 01 is, in consequence of the converging slots 0, so neared that only a very small space-about one-sixteenth or one thirty-second of an inch-remains. The tension of the spring is so increased that the tendency of the spring to contact is balanced by the weight of the lamp. The rollers are prevented from descending so far that the springs g are pressed against each other by the horizontal arms of the T-piece e and the clamping of the springs could ensue. If it is desired to have the lamp hang somewhat lower, it suffices to simply draw down the same with the hand, when the lamp will remain in the position desired. On the other hand, it is only necessary to press the lamp upward to give the same a higher position. The rollers d receive hereby a certain upward pressure, and as the same are simultaneouslypressed outwardbythesprings g they rise in the diverging slots and move somewhat from each other. The friction be tween the springs g and the rollers d is hereby decreased and consequently the raising of the lamp facilitated, and, furthermore, the lamp will remain in any desired position. When springs of stronger metal are employed, the rollers must be arranged somewhat farther apart, which is done by shifting the T- piece somewhat higher, for which purpose the walls a a are provided with several borings n for receiving the bolt f.

It will be evident from the foregoing that the form, size, and arrangement of the parts can be modified in various manner without witnesses.

U. H. STAHL DE BOER.

Witnesses:

WILHELM Voer, FRED J. DOWNING.

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