US18200A - Mode of operating window-sash - Google Patents

Description

UNITED STATES PATENT OFFICE.

JOHN C. GRANT, OF SALEM, MASSACHUSETTS.

MODE 0F OPERATING WINDOW-SASH.

Speccaton of Letters Patent No. 18,200, dated September 15, 1857.

l'o all whom it may concern.'

Be it known that I, JOHN C. GRANT, of Salem, in the county of Essex and State of Massachusetts, have invented an Improvement in Raising and Lowering Window- Sash, and that the following is a full, clear, and exact description of the principle or character which distinguishes it from all other things before shown and of the usual manner of making, modifying, and using the same, reference being had to the annexed drawings, of which- Figure l shows a front elevation of framing and t-he manner of hanging the sash. Figs. 2 and 3 are two views of the gearing.

My invent-ion consists in an improvement for holding window sashes at any desired point of elevation, dispensing with the use of weights and cords and their attending difliculties, for balancing the sashes, as here in described.

Fig. l represents the frame A, window sash B and the arrangement for balancing the sash, in section, and is described as follows. The plate C is screwed into the frame A flush with its inner surface and has four projecting pieces a, a, a, a extending out from it which are braced together by the two cross braces b, and the oblique side plates c, c. These plates serve for bearings for the cone pulley CZ and gear wheel d and pulley el. The pulley d has one end of a cord e fixed to it which is wound in the spiral slot f (seen in Fig. 2) on the cone pulley CZ which is made larger than the pulley c both pulleys having flanges on their ends to prevent the cord from running off the ends. A smaller pulley g is provided on the end of the pulley (Z around which is coiled a spring h. One end of the spring being fastened to this pulley the other end is carried over and secured to the cross brace Z9. The gear wheel al meshes into gear wheel lo which turns loosely on the shaft of the cone pulley d. The teeth of this pulley pass through a small slot in the plate C, shown clearly in Figs. l and 3 and take into the rack z' which rack is secured in a groove in the side bar of the window sash and extends t-he whole length of the sash. The pulleys, gear wheels and spring are inserted together in a recess E mortised in the frame A, and are secured there by the plate C, as above described. As the window is raised or lowered the rack operates the loose gear wheel 70 and this wheel operates the wheel d which is fixed to the pulley d and winds up the cord e around this pulley which unwinds it from t-he larger pulley (l this, turning slower than the pulley cl winds up the spring which tends to force the window up. By properly adjusting the spring to the weight of the window it will exert just sufficient strength to sust-ain it at any point of elevation to which it may be placed. By making the gear wheel 7: turn loose on its shaft and the cone pulley d larger than the pulley c I can make a very short spring answer for a long sash. This mode of sustaining the sash is simple, durable,more economical than weights and cords, and is very accessible in case of the derangement of any of the parts, which is not the case with the commonly used weights and cords.

I do not claim balancing the sash by means of a spring as that is not new. But

That I do claim is- Combining with the window frame and sash the rack a, gears Z), o pulleys c, c and spring (Z all arranged and operating substantially as herein above set forth.

JOHN C. GRANT.

Witnesses:

JOSEPH HALE, BENJ. A. GRAY.

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