US995335A - Sash-suspension device. - Google Patents

Description

M. DOBSON.

SASH SUSPENSION DEVICE.

APPLIOATION FILED DEC. 30, 1910.

Patented June 13, 1911.

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M. DOBSON.

SASH SUSPENSION DEVICE. APPLIOATION rruzn 10110.30, 1910.

Patented June 13,1911.

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SATES PATENT Fro MATTHEW DOBSON, OF PITTSBURG, PENNSYLVANIA.

SASH-SUSPENSION DEVICE.

Specification of Letters Patent. Application filed December 30, 1910.

Patented Juneffi, 1911. Serial No. 600,156.

ed inthe face plate, and Fig. is a detail of the shaft locking latch.

The following is a detailed description of the drawings.

A is a window ed the upper is a metal box, one of which is secured in an aperture in the upper portion of each To all whom'it may concern:

Be it known that I, MATTHEW DOBSON, a citizen of the United States, and residing in the city ofPittsburg, .in the county of Allegheny and State of Pennsylvania, have invented or discovered new and useful Improvements in Sash-Suspension Devices, of which the following is a specification.

My invention consists in a new and imframe in which are mount- 10 proved window sash suspension device, ing through holes aa in the box .D and adapted for use as a substitute for the conengaging the material of said frame. The ventional cord and suspended weight. box D is provided with a removable cover Generally speaking, it consists of a sashpreferably formed vertically in two plates 1 cord spool fixed upon a rotating shaft which and 1 which are of greater length than the is mounted, preferably, in a box or casing height of the box'D so that they may be secured in the upper portion of the window fixed in place by means of screws passing frame. A spiral spring is coiled about said through holes bb in the ends of said plates shaft, one end of the spring being secured to -and engaging the material of frame A. said spool and the other end tothe box or In the box D are mounted a pair of sashsome other fixed point. The strength and cord spools 2 and 2 controlling, respectension of the spring is regulated so that it tivcly, the upper sash B and the lower sash acts upon the spool to balance the weight of G. As these spools are of identical conthe sash and prevent its accidental descent struction but placed in reversed position, I from any adjusted position. will proceed to describe the upper spool 2.

Means are provided for preventing the The spool 2 is provided with a pair of cirlongitudinal movement of the shaft when incumferential flanges 3-3 and a bore of stalled and I prefer also to provide a pulley varying diameter 4-5. The smaller bore keyed to the outer end of the shaft whereby 5 is threaded, as shown. the Window may be conveniently raised .or 6 is the spool shaft, having its ends jourlowered by means of a belt or cord passing naled in holesof suitable size in the walls over said pulley and operatively connecting of box D. One end of shaft 6 is of reduced the same to a hand or power operated diameter and is threaded to engage the mechanism. threaded bore 5 of spool 2, while the re- Novel construction and arrangement of mainder of said shaft is of proper size to fit parts will appear from the following deloosely the larger diameter 4. of said spool.

scription. The outer end of shaft 6 is provided with a In the accompanying drawings, Figure 1 slot 7 so that a screw driver may be used is a perspective showing a window frame, to install the same. To prevent longitudinal in which are mounted an upper sash and a vmovement of the shaft 6, I provide a latch lower shaft, provided with my suspension 8 pivoted on the outer wall of box D and devices, the frame being partially broken engaging a circumferential groove 9-in the away to show one of the suspension devices; surface of shaft 6, thus holding said shaft Fig. 2 is a front elevation of the box, pulleys in place but permitting its free rotation. being provided on the outer ends of the 10 is a' spiral spring mounted on shaft 6 spool shaftsyFig. 3 is a vertical section of and having one of its ends secured in a the same along the line III-III in Fig. 5; hole in the bore of spool. 2, while the other- Fig. 4 is a.horizontal section of the same end is secured in a hole in the wall of box along the line IV-IV' in Fig. 2; Fig. 5 is a The strength and tension of the spring side view of the box, looking in the direcis regulated so that it counterbalances the tion of the arrow in Fig. 2, the pulley being weight of the window sash. omitted; Fig. 6 is a detail of one of the spool 11 is the sash-cord, one end of which is shafts; Fig. 7 is a detail of one of the spools, secured in the usual manner to the edge of and Fig. 8 is an end View of the same looksash B while the other end. is led up over ing in the direction of the arrow in Fig. 7; an anti-friction roller 12, mounted in face 5 ig. 9 is a-detail of one of the rollers mount-. plated, is wound about the spool 2 and se-;

side of the frame by means of screws passsash B'and the lower shaft C.

cured atits end thereto to prevent slipping. It is evident that the spring 10 counterbalances the sash so that the sash may be be raised or lowered by grasping the sash in the usual manner, as in churches or pubhe buildings, I find it convenient to raise or I lower the sash by rotating the shaft 6. For

this purpose I key or'otherwise secure a pulley 13 upon the outer end of shaft 6, which pulley may be engaged by a cord or belt 14 operatively connected to a hand orpower operated mechanism, not'shown. In such cases I,-pr efer to provide some means for preventing the spool 2 from unscrewing from shaft 6, such as a key 15 engaging said shaft and said spool. The lower spool, 2, is mounted in a manner the reverse of that of spool'2, so as to bring spool 2 in the proper horizontal position. Shaft 6 latch plate 8 spring 10*,pulley 13 and cord 14 are similar to the corresponding elements in the installation of spool 2. The sash-cord 11 is attached to and Wound about the spool 2 led over a roller l2 mounted in face plate 1*, and is attached in the usual manner to the edge of the sash C.

In installing the box D in the frame, the plates. 1 and 1? are secured in place, as shown and the strip 16, which is secured to the frame and interposed between the sash B and C, is carried up over the abutting edges of said plates, concealing their juncture but not interfering with their re inoval when desired. When it is desired:to gainaccess to either spool, as for the 111- stallation of a new sash-cord or for any other purpose, the proper plate 1 or 1 may strong. In case the spring breaks or be comes weakened, the same may be replaced without difiiculty. The box D is practically dust proof and is much more inconspicuous than the devices now in general use. I avoid the rattling and banging of the weights when the sash is raisedor lowered rapidly,.and the great inconvenience of installing anew cord in the case of a break.

What I desire to claim is A sash suspension device composed of a box, a shaft rotatably mounted therein, a sash-cord spool fixed on said shaft, a spiral spring coiled about said shaft, one end of said spring being secured to said spool and the other end thereof being secured tosaid box, a removable cover for said box, and a cord roller mounted in said cover.

Signed at Pit-tsburg, Pa, this 24th day of December 1910.

. MATTHEW DOBSON. Witnesses E A. W. FoRsY'rH, EDW'ARD A. LAWRENCE.

Copies of-this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. e.

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