US 350429 A
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Description (OCR text may contain errors)
. 0 W S I R G N. B
SUSPENSION DEVISE EOE LAMES AND oTEEE ARTICLES.
Patented 001;.A 5, 1886.
l u g., I771/1111111 1111/1 willi/111111111111 N. PETERS. PncwLmmgmpner. wamingmn. D. C.
(No Model.) I 2 Sheets-Sheet 2. E. N. GRISWOLD.
SUSPENSION DEVISE POR LAMPS AND OTHER ARTIGLLS.v No. 350,429. Patented Oct. 5, 1886..
14am/f5 SES l l (mac/WUR NITED STATES ATENT' FFICE@ EDVARDv N. GRISWOLD, OF BROOKLYN, NEW YORK.
SUSPENSION DEVICE FOR LAMPS AND ARTlCLES.
SPLCFICATIQN I'orinling part of Letters Patent ICQ-350,429, dated October 5, 1386.
Application filed August l5, 1885. Serial No. 174,506. (No model.)
T0 @ZZ whom t may concern.-
Be it known that I, EDWARD N. GRiswoLD, of the city of Brooklyn, county of Kings, and State of New York, have invented a certain new and useful Improvement in Suspension Devices for Lamps and other Artcles,of which the following is a specification.
My invention relates to devices employed to counterbalance the weight of a lamp or other article suspended from a ceiling or other support, so that the lamp or other article will remain' at any position into which it may be adjusted vertically, and yet can be easily raised.
I will describe in detail a suspensiondeviee embodying my improvement, and then point out the improvement in claims.
In the accompanying drawings, Figure l is a vertical section of a suspension device embodying my improvement. Fig. 2 is a plan or top view thereof, certain parts being removed to disclose features which would otherwise be hidden. Fig. 3 is a detail thereof. Fig. 4 is a view of an arbor of modified form which may be employed in the device. Fig. 5 is a View of an arbor and brake of modified form which may be employedin the device.
Like letters designate like parts inail the figures.
A designates a drum. This drum may be made of metal, and is hollow. It is provided with anges a, extending eircumferentially about the same. Between the iianges cords or chains B are wound upon the drum. I have shown two of such cords or chains; but one only need be employed, if desirable. A counterbalance is combined with the drum here shown. It consists of a convolute spring, C, coiled within the drum and about au arbor,D. One end of the spring is secured to the arbor D in any suitable manner, and the other end thereof is secured to the drum A. The spring G is intended to counterbalance the weight of a lamp or other article suspended from the cords or chains B. The arbor D passes centrall y through the drum A, and the drum may turn freely about the same.
The drum A and arbor D are supportedin a frame comprising two portions or plates, E E', and post-s or pillars b,extending between them, and securing them rigidly together. The portion or plate E is arranged above the drum, and the portion or plate E below the same. Said frame may be cast in one piece,if desirable. The arbor D extends through suitable apertures iu said frame above and below the drum. The arbor does not rotate. It is prevented from rotation by afeathcr or spline-arranged between the arbor and the portion or plate E. Below the portion E of the frame is a collar or washer, b. A nut, F, prevents the frame and drum from passing off from the arbor D. Guides consisting of pnlleysF are mounted on pins or studs upon the pillars or posfs b of the frame. The cords or chains B pass over the pulleys F. i
I prefer to construct the arborD as follows: Near the upper end thereof the sameis screwthreaded. This screw threaded end receives the internally-screw-threaded end` of a hollow cylinderortube, G, which may advantageously be made of brass, but may be made of other metal. The other end of the cylinderG is eX- ternally screw-threaded to receive a cap, c, to which is connected by a swiveling connection a loop, H, by means of which the device'is suspended from a hook or other support. Wedges or cams Iare arranged in the cylinder G, between the upper portionl of the drum and the portion or plate E of the` frame. In the example ofmy improvementshown the wedges or cams I are formed by the upper edges of inclined slots. It is'advantageous to employ slots, because the same may be easilycut into the cylinder; but these wedges or cams may be stamped or cast in the cylinder, if-desired,and need not necessarily extend through the wall of the cylinder or form part of slots. The wedges or cams are formed inthe arbor, as the cylinder G is in effect part of the arbor. There slots are einployed,they will preferably extend spirally to the outer end of the cylinder, for reasons to be hereinafter explained.
Ofcourse,the arbor maybe made of one solid piece, instead of a solid piece and a cylinder forming an extension thereof, and then inclined grooves would be formed in them, as shown in Fig. 4 ofthe drawings.
J designates a brake. This brake consists of a disk, preferably of metal, provided with a central aperture and fitting about the tube or cylinder G of the arbor D, between the portion E of the frame and the drum. It may oscillate or vibrate freely about the arbor, and is, as here shown, guided thereby. Lugs or pro jections d, constituting abutments upon the edge of the brake adjacent to the arbor, bear against the wedges or cams I. NVhere slots or grooves are used, by extending them to the JTO outer end of the cylinder, the insertion and removal ofthe abutments d upon the brakeis facilitated. I prefer to face the side of the brake nearer the drum with india-rubber, leather, or other suitable material to increase its f'rictional resistance.
rlhe brake J is normally in contact with the drum. W'hcn the drinn is rotated in the direction to unwind the cords or chains, or, in other words, against the resistance ofthe spring C, the brake J', owing` to its frictional contact, rotates with the drum a short distance. The abutments d on the brake bear against the inclined wedges or cams I, which are therefore caused to exert a wedge-like action upon the abutments, which forces the brakedownward- ]y,so that it will bear with greater force upon the drum. Si ops c (here shown as lugs or pins) extend downwardly from the portion E ofthe trame, and into the path of' teeth or projectionsf upon the outeredge of the brake. These stops prevent a too extended rotation ot' the brake in the direction in which it is rotated by the drum during the unwinding ofthe cords or chains. Obviously but one stop need be employed. XVhen the cords or chains are being rewound, or, in other words, when the Weight upon the cords or chains is relieved, the spring C operates to rotate the drum in a reverse direction to that just described. This operation reverses the direction of rotation of the brake. The position of the wedges or cams is therefore changed in such relation to the drum and abntmcnts l that thepressnre ofthe brake upon the drum wi ll be rel axed,and the d rum may then rotate freely. Then slots or grooves are employed, there are, as a consequence,wedges or cams I formed by the lower edge of said slots or grooves, in addition to the wedges or cams l. rlhese formel-,acting on the abutments, tend to move the brake upwardly or away from the drum.
the brake and between it and the portion E of the frame. These springs are bow-shaped, and have their ends bearing upon the brake. They may be adjusted toward and from the brake, so as to increase or decrease their resistance, by means of thumb-screws g, passing through tapped holes in the portion E of the frame. cured to the springs K about midway in the lengths ot' the latter.
It' the cylinder or tube G were rigidly secured to the brake, or the brake were otherwise 'provided with wedges or cams, and the abutments fl were upon the arbor, the effect would be the same. In such case the brake I have shown such an, arrangement in The thumbscrews g are rigidly se- It will be seen that by my improvement I am enabled to construct a suspension device which will operate very effectively to resist the rotation of the drum in the direction to unwind the cords or chains or when the weight of the lamp or other article is applied thereto, but will permit the drum to rotate freely when the cords or chains are being rewound or when the latter are relieved from the, weight of the article suspended therefrom.
I am aware that a suspension device has been made in which a brake or brake-shoe is in contact with the interior of` the drinn, and a swinging rod or arm extends between the brake or brake-shoe and an abutment supported by the arbor. Such a suspension de vice is shown in United States Letters Patent No. 323,051, July 28, 1885. I do not herein lay claim to anything claimed in said Letters Patent.
What I claim as my invention, and desire to secure by Letters Patent, is*- 1. The combination, with afi-ame and arbor constituting the iixed portion of thermachine, of' a spring-drum mounted on said arbor, cords or chains wound upon said drum and passing to the article to be suspended, a plate in contact with the drum and in close proximity toa part of the fixed portion of the machine, said plate and fixed portion heilig provided, the one with a wedge or cani and the other with a projection acting in conjune tion with said wedge or cam, and stops projecting from the fixed portion of the machine engaging said plate, substantially as specified.
2. The combination, with ai'rame and arbor constituting the fixed portion ot' the inachine, of a spring-drum mounted on said arbor, cords or chains wound upon said drum and passing to the lamp or other article to be suspended, a plate surrounding the arbor and in contact with the drum, said plate and fixed portion being provided, the one with a wedge or cam and the other with a projection acting in conjunction with said wedge or cam, and stops projecting from the fixed portion of the machine engaging said plate, substantially as specified.
3. The combination, with a frame and ar' bor constituting the fixed portion of the machine, of a spring-drun1 mounted on said arbor, cords or chains wound upon said drum and passing to the article to be suspended, a plate in contact with the drum and in close proximity to a part of the fixed portion of the machine, said plate and iixed portion being provided, the one with a wedge or cam formed by a slot or groove and the other with a projection acting in conj unetion with said wedge or cam, and stops projecting from the xed portion ofthe machine engaging said plate, substantially as specified. l
EDWARD N. GRISWOLD.
R. B. MollIAs'rnR, Grits. A. MURPHEY.