US432137A - Sash-balance - Google Patents

Description

(No Model.)

S. JENKINSON.

l sAsH BALANCE.

Patented Ju1y 15, 1890.

VIO

UNITED STATES PATENT OFFICE.

SAMUEL JENKINSON, or ROCHESTER, NEW YORK.

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 432,137, dated July 15, 1890.

.Application filed January 6, 1890. Serial No. 335,960. (No model.)

T0 all whom, it may concern:

Be it known that I, SAMUEL J ENKINsoN, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Sash-Balances, which improvement is fully set forth in the following specification, and shown in the accompanying drawings.

My invention relates to that class of sashbalances in which the sash is held by cords wound upon spring-actuated drums, the cords passing over idle-pulleys above the respective drums.

The ob ject of the invention is to provide an improved method of guiding or carrying the cord, to provide an improved and better brake for modifying the action of the springdrum, and regulate the running of the cord on and off the drum. The invention is hereinafter fully described, and more particularly pointed out in the claims.

Referring to the drawings, Figure l is a side elevation of a part of a window sash and casing with my improved sash-balance in place,

numerous parts being broken away and vertically sectioned; Fig. 2, a view of the sashbalanee seen, as indicated by arrow in Fig. l, parts being broken away and the frame vertieally sectioned, as on the dotted liney in Fig. l, parts being shown in two positions by full and dotted lines; Fig. 3, a view of the device seen, as indicated by arrow e, in Fig. l; Fig. 4f, a side elevation of a portion of the frame of the device. Fig. 5, drawn to a larger scale, shows one of the bearing-faces of the brake, a part of the rubbing piece being broken away; and Fig. (i, drawn to a still larger scale, is a cross-section taken on the dotted line Qc in Fig. 5.

Referring to the parts, A is the sash, and B the casing of the window, both of common construction.

C is my improved sash-balance set in a cavity a in the casing, in the usual manner, and held to place by ordinary screws b b.

c is the frame of the device, and d the faceplate. D is a Spring-actuated drum, substantially of common construction, held within the frame by aXi al projections e e, in the usual manner.

f is the suspending-cord wound upon the drum in circumferential spiral grooves g.' The cord passes over a grooved idle-pulley h within the frame, held to turn lfreely upon a horizontal shaft e', rigid with the frame, and to move laterally thereon froln side to side of the frame. The cord is attached to the sash by an ordinary fastening device k.

Z is a brake divided at its upper end and held to bear upon the conical or inclined surfaces n n of the idle-pulley. The brake is held to turn upon a rigid horizontal pin o and is fitted to slide laterally thereon.

p is an adj Listing-screw for the brake, passing freelythrough the lower end of the brake. This screw passes through a side of the frame in which it has a bearing,v there being an opening r in the face plate to make way for the head of the screw.

s is a nut for the screw, with its reduced ends resting in horizontal slots t t in the opposing sides of the frame.

a is a coiled spring upon the adjustingscrew between the nut and the brake, acting to press the latter against the idle-pulley. By turning the screw into t-he nut the latter will be drawn toward the brake, thus compressing the spring and causing it to press the brake more iirmly against the idle-pulley. A reverse motion of the adj listing-screw will cause the brake to bear less heavily upon the idlepulley.

The inner opposing faces of the brake that bear against the idle-pulley, are provided with yielding friction-pieces o, Figs. 5 and 6, to bear directly upon the surfaces of said pulley. These friction-pieces, which may be of leather, india-rubber, and cloth, or similar material, are set into dovetailed depressions w, as shown, and project beyond the respective faces of the brake.

As the cord Winds upon or unwinds from IOC 1 and 2. These motions of the brake are radial, it turning` upon the screw p as apivot or center.

I find in practice thatit is advantageous to apply the brake to the idle-pulley rather than to the drum or cord, as is usually done. The idle-pulley revolves more rapidly than the drum in proportion to the difference in the two diameters and a much less brake-pressure applied to the idle-pulley is :needed to regulate the motion of the parts than if applied to the drum or the cord.

It Will be understood that on account of 'the idle-pulley being shiftable upon its shaft, as stated, when in different positions, its plane if extended Would cut the drum at different places.

Vhat I claim as my invention isy 1. In a sash-balance, an actuating-drum and a suspending-cord on the drum, in combination With a laterallymovable idle-p Lilley and a brake pressing` said idle-pulley, substantially as described.

2. The combination, in a sash-balance, of an actuating,` drum and a suspending-cord, with an idle-pulley for the cord, a brake for the idle-pulley, and an adjuster for the brake, substantially as described and shown.

3. In a sash-balance, a drum and a cord, in combination with an idle-pulley formed with conical or inclined sides and a divided brake to bear upon said inclined sides, substantially as shown.

4. In combination With the drumA and the cord of a sash-balance, a laterally-movable idle-pulley, and a brake bearing upon said idle-pulley, said brake being constructed to turn or swing upon a pivot to keep with the idle-pulley, substantially as shown and set forth.

5. In combination With the drum and the cord of a sash-balance, an idle-pulley and a brake mechanism for said pulley, consisting of a brake proper, an adj Listing-screw, apressure-spring, anda nut, substantially as shown.

In Witness whereof I have hereunto set my hand this 23d day of December, 1889. in the presence of two subscribing,` witnesses.

SAMU EL .IENKINSON Witnesses:

E. vB. WHITMORE, M. L. MCDERMOTT.

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