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Publication numberUS466941 A
Publication typeGrant
Publication dateJan 12, 1892
Filing dateApr 14, 1891
Publication numberUS 466941 A, US 466941A, US-A-466941, US466941 A, US466941A
InventorsSamuel N. Goldy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sash-balance
US 466941 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)

S. N. GOLDY.

SASH BALANOE.

No. 466,941. Patented Jan. 12, 1892.

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UNITED STATES PATENT OFFICE.

SAMUEL N. GOLDY, OF SAN FRANCISCO, CALIFORNIA.

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 466,941, dated January 12, 1892.

Application filed April 14, 1891- Serial No. 388,879. (No model.)

,To all whom it may concern;

and I do declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same,

reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to a sash-balance in which a gear-wheel meshing with a rack-plate on the sash is secured to a combined springactuated fusee and barrel, with which latter another like fusee and barrel is connected by a flexible connection attached at one end to one of the fusees at its largest diameter and atits other end to the barrel of the opposite combined fusee and barrel, wherebyI am enabled to use comparatively short springs, the tension of the springs is equalized at all points of-elevation of the sash, and compensation is made for loss of tension of the springs when the sash is raised. I accomplish the above results by means of the mechanism illustrated in the accompanying drawings, in which Figure 1 is an end elevation of the sashbalance, the casing being in section, showing the position occupied by the operating mechanism. Fig. 2 is a side elevation, the casing and one of the combined fusee and barrel,

cylinders being in section, showing the gearwheel of the other fusee and barrel in engagement with a rack-plate on the sash. Fig. 3 is an end elevation showing the casing as it appears when in the frame.

Referring to the drawings, A designates the face-plate, B the rim, and C C the side plates, of the boxing or casing in which the operating mechanism is housed, which boxing is fitted and secured in a recess formed in the window-frame D. The face plate is formed of two sections 1 2, the one having lugs 3 and the other recesses 4:, in which the former fit to hold the sections in the. proper position with relation to each other, screws 5 passing through the two sections, serving to hold them together. The section 2 is formed with a recess 6,into Which fits a shoulder 7, carried by the section 1, the vertical wall of the recess and the shoulder forming a slot 8, the width of which may be increased or diminished by lengthening or shortening the said shoulder.

E F designate two combined fusee and barrel cylinders, which for the sake of convenience of description will be hereinafter (165-.

ignated as fuseecylinders, which cylinders are loosely mounted upon shafts G, journaled in the sides 0 C of the casing. One end of each of these shafts carries a rigidly-attached ratchet-wheel H, which is engaged by pawls 9 on the side 0 of the casing, whereby the said shafts are free to revolve in but one direction only. The end of each shaft is also provided with a recess 10, into which a key is inserted when it is desired to turn the shaft, for a purpose that will presently appear.

I designates two helical springs, one end of each of which is secured to shaft G and the other end to the inner surface of the said cylinder.

J designates a gear-wheel which is carried by the cylinder E, a portion of the periphery of which wheel extends through the slot 8 in the face-plate and engages a rack-plate K, carried by the window-sash.

L designates a pin which is mounted in an apertured lug 11 on section 2 of the face-plate and carries on its inner end a toe 12, designed to be turned into engagement with the gearwheel J to prevent uncoiling of the springs when the sash is removed, a projection 13, working in a slot 14 in the lug, serving as a stop to prevent the toe being turned too far. The outer end of the pin is provided with a nick 15, into which is inserted the point of a screw-driver when it is desired to turn the pin for the purpose above stated.

The cylinders E F, to which reference has been made, are each constructed with a tapered spirally-grooved fusee portion 16 and with a straight or barrel portion 17, which portions are preferably of the same dimensions in each cylinder, although, if desired, the dimensions may be varied. A cable or chain M serves to connect the two cylinders and is secured to the large diameter of fuseo 16 of one cylinder and to the straight or barrel portion 17 of the other cylinder.

In setting the balance for operation the springs are put under the desired tension by turning the shafts in the manner described, which tension is sufficient to hold the window at its highest raised point, at which time the cable is wound upon the cylinder F. As the window is lowered the cable is unwound from cylinder F and wound upon cylinder E, and as the cable is leaving the largest diameter and is approaching the smallest diameter of both cylinders, and vice versa when the window is raised, it follows that the tension of both springs is equalized, thereby requiring but little power either to raise or to lower a window. 7

In practice the gear J is preferably made of such a size that itwill not make more than three revolutions while the sash is being raised to its full height, thus causing but a small loss of tension in the springs, and, as a consequence, requiring but a small change of the diameter of the cylinder; but it is to be understood that I may, if desired, diminish the diameter of gear J and increase the diameter of cylinders E F. By either construction, but preferably by the former, I provide for an increase of leverage as the springs lose tension and the reverse when they are being placed under tension, whereby thetensionof the springs is always equalized whether the sash is being rfaisedor lowered. By means of the barrel portions of the cylinders the gear J is allowed, preferably, to make one complete revolution before the cable begins to climb the tapered portions, as the loss of tension in one revolution is so slight as scarcely to be perceptible and not enough to effect the working of the sash-balance.

Having thus fully described my invention, whatI claim as new, and desire to secur'eby Letters Patent, is''- I 1. In a sash-balance, a casing, two springactuated fusee-cylinders jour'naled therein, one of which carries a gear-wheel, and a flexible connection uniting the large diameter of one cylinder with the small diameter of the other cylinder and contacting normally with the small diameters of the two cylinders, in combination with a fixed rack-plate with which the said gear-wheel meshes.

2. In a sash-balance, a casing, two springactuated fusee-cylinders journaled therein, each consisting of a fusee portion anda barrel portion, a gear-wheel carried by one of the cylinders, and a flexible connection uniting the said cylinders, in combination with a rackplate with which the said gear-wheel meshes. 3. In a sash-balance, a casing, two shafts journaled therein, fusee cylinders loosely mounted on the shafts, one of which cylinders carries a gear wheel, springs connecting the shafts and the cylinders, and a flexible connection uniting the two cylinders, in combination with a fixed rack-plate with which the said gearwheel meshes.

4. In a sash=balance, a casing, two shafts journaled therein, fuse'e cylinders loosely mounted on the shafts, one of which cylinders carries a gear wheel, springs connecting the shafts and the cylinders, means for regulating the" tension of the springs, and a flexible connection uniting the two'cylinders, in combination with a rack-plate adapted to be engaged by the saidgear-wheel.

5. In a sash-balance, a casing, two shafts journaled therein carrying rigidly attached ratchet-wheels, pawls carried by the casing and engaging'the said wheels,fusee cylinders loosely mounted on the shafts, one of which cylinders carries a gear-wheel, helical springs connecting the Shafts and the cylinders, and a flexible connection nnitingthe' two cylinder's, in combination with a fixed rack-plate with which the said gear=wheel meshes.

In testimony whereof I affix my signature in presence of two witness-es,

I SAMUEL N. GOLDY. Witnesses:

J AS. 0. L. WADswoRTH, GEO. T. KNox.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4953256 *Feb 6, 1989Sep 4, 1990Raytheon CompanyCounterbalance mechanism
Classifications
Cooperative ClassificationE05D13/00