US1019690A - Sash-lifter. - Google Patents

Description

F. J. ODERMATT.

SASH LIFTER.

APPLICATION 11,111) JULY 21, 1011.

1,019,690. Patented M21115, 1912.

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UNITED STATES PATENT OFFICE.

FRANK J'. ODERMATT, F TUCSON, ARIZONA.

SASH-LIFTER.

T 0 all whom it may concern:

Be it known that I, FRANK J. ODERMA'LT, a citlzen of the United States, residing at Tucson, 1n the county of Plma and State of Arizona, have lnvented certain new and use A i'ul Improvements in Sash-Lifters, of which the following is a specification.

My invention relates to improvements in sash lifters, and has for its object the provision of an improved device which may be readily secured to an ordinary window frame and which will serve to take the place of a customary sash weight or balances in facilitating the raising or lowering of the window and holding the same in any desired adjusted position.

The further object of'my invention is the provision of an improved device of this character which may be secured in position in a window frame and which will thus eliminate the necessity of forming the double stile to provide a passage in which the usual sash weight or balance may move.

Another object of my invention is the provision in a sash lifting device of an improved form of spring pressed drums for winding up the sash cord or cable and of improved novel means for braking or controlling the movement of the drum to cause the window to remain at all times in a desired adjusted position, and yet to cause the drum to automatically wind up the sash cord or cable when the window is lifted.

Other objects and advantages of my improved sash lifter will be readily apparent by reference to the following description taken in connection with the accompanying drawings, and it will be understood that I may make any modification in my structure shown and described within the scope of my claim without departing from or exceeding the spirit of my invention.

In the drawings, Figure 1 represents a fragmentary View of an ordinary window equipped with my improved sash lifting device, Fig. 2 represents a plan view of the said device with the inclosing casing therefor removed, Fig. 3 represents a side elevation of the device as shown in Fig. 2, Fig. 1 represents a perspective view of the axle pin of my invention, illustrating the means for adjusting the tension of the spring carried thereby, and Fig. 5 represents a perspective view of the cam brake member for engaging the winding wheel or drum of my invention.

Specification of Letters Patent.

Application filed July 21, 1911.

Patented Mar. 5, 1912.

Serial No. 639,772.

In the drawings, the numeral 1 designates the stiles oil the window having the ordinary grooves or guideways 2 formed therein for the sides of the window sashes 3, while extending upward from the top of the window sash stiles are the sash cords l, said parts being of customary construction.

Secured to the top of the stile 1 of the window casing are the base plates 5 of my invention, while secured upon and rising from each of the base plates 5 is the dome or casing G which inclose the operating parts of my invention, an axle member 7 being rotatably mounted centrally of the sides of the dome or casing and extending across the space included by the casing. Said pin has the slot 8 formed in one end thereof and extending diametrically thereof, while formed in the sides of the axle pin are the recesses 9 adapted to engage the ends of the blade spring 10 which is secured to the exterior of the casing, the engagement of the end of the spring in the recesses 9 being such as to permit of the turning of the axle pin in one direction but preventing of its reverse turning. Rotatably engaged upon the said axle pin 7 and located within the casing 6 are the hubs 11 having the radiating spokes 12 which are secured to the side flanges 13 of the sash cord or cable winding drum 14, it being understood that if desired the said winding drum, spokes and hub may be cast or formed in a single piece. Mounted upon the axle 7 and having one end secured thereto is the coil spring 15 which has its other end secured to the inner face of the winding drum 14, the turning of the axle 7 by engagement of a screwdriver or similar tool in the slot 8 in its end serving to wind up the said spring, the blade spring 10 acting as a pawl to lock the axle with the spring wound under suitable tension.

From the foregoing description taken in connection with the accompanying drawings the. construction of my improved sash lifter will be readily understood, and it will be seen that the spring tends to rotate the drum 14 to wind the sash cord or cable thereon and thus to hold the window sash in raised position. In order that the window sash may remain in the desired position and to prevent the spring from moving the sash upward when it is desired to have the window open, I rotatably mount on the axle 7 the cam shaped washer 16 having the inwardly extending substantially triangular shaped lug portions 17 which are adapted to lockingly engage the spokes 12 of the winding drum as said drum is moved to unwind the sash cord therefrom. A disk spring 18 is mounted upon the axle? and has one end bearing against the casing and the other end bearing against the outer face of the washer 16 to force the lug portions 17 of the said Washer into tight engagement with the spokes. To cause the said cam washer to act as a brake against automatic winding movement by the drum 1-1, I secure to the base plate 5 one end of the heavy blade spring member 19 which is bent to extend upward and bear against the periphery of the cam washer, whereby the said spring will tend to hold the cam washer against accidental rotation and to lock the same in any position to which it may be pushed by the lowering of the window sash and the consequent unwinding of the drum 14. It will thus be seen that when the cord is unwound from the drum 14 the braking action of the cam washer 16 in connection with the weight of the window sash will be suflicient to prevent the drum from being turned by the spring to wind the cord thereon thus to raise the window and prevent the window from staying in desired adjusted position. lVhen it is desired to shift the sash upward, however, as the person grasps the sash to raise the same the strain of the weight of the sash will be taken off of the sash cord, when the tension of the spring 15 will be sufficient to rotate the drum 14 and wind up the sash cord thereon, the spokes riding against the beveled faces of the lugs 17 and forcing the braking washer 16 outward against the tension of the disk spring 18, whereby the said braking disk washer 16 remains held in position by the spring 19 while the drum 14; rotates independently thereof.

To prevent the sash cord from binding against the casing as it is lifted, I preferably pass through the casing the pivot pin or rivet 20 on which is mounted the guide sheave 21 over which the sash cord passes as it enters the casing, said guide sheave 21 serving to guide the sash cord on to the sash drum let and to prevent the said sash cord from binding against the edges of the easing.

It will thus be seen that I have provided a thoroughly simple and eflicient sash lifter in which the tension of the operating spring may be readily adjusted, and which is provided with an improved form of brake of such nature as to allow of the placing of the window sash in any desired adjusted position and prevent the winding drum from moving the sash from said adjusted position, while releasing the drum upon shifting of the sash to allow the drum to wind up the loose sash cord.

I claim:

A. sash lifter, comprising a base plate, a casing secured to and rising from the base plate, an axle rotatably engaged in the sides of the casing, and having recesses formed in one of its ends, a pawl device for engaging the recessed end of the axle to hold the same against rotation in one direction, a shell winding drum including spokes mounted upon the axle, a spring coiled on the axle and having one end secured to the axle and the other to the drum, the rotation of the axle serving to adjust the tension of the said spring, a sash cord having one end secured to the winding drum, a cam washer rotatably mounted upon the axle adjacent one side of the drum and having inwardly extending beveled lugs adapted to grippingly engage the spokes of the drum upon rotation of the same in one direction, a spring for holding the cam washer in engagement with the drum, and a resilient brake having one end secured to the base portion and its other end engaging the periphery of the washer for resisting rotative movement thereof.

In testimony whereof I aflix my signature, in the presence of two witnesses.

HARRY E. SHEPARD, THOMAS W. CAR.

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

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