US1946880A

US1946880A - Sash balance

Info

Publication number: US1946880A
Application number: US664009A
Authority: US
Inventors: John F Peterson
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-04-01
Filing date: 1933-04-01
Publication date: 1934-02-13
Anticipated expiration: 1951-02-13

Description

Feb. 13, 19346 A J. F. PETERsoN sAsH BALANCE Filed April l, 1933 ll/Il/l/I lll Invent-or 1752 F Pezmn man..

I `,qllomey Patented. F el). 13, 1934 I UNITED? sTA TEs PATENT oFFicE.

2 Claims.

This invention relates to sash balances of the type in which the sash is held by tape wound about spring-dnuns which are provided with brakes; and in accordance with the present invention a balance of this character is provided whichV is believed to be materially simplified over similar prior art devices, to be durable in operation and otherwise a general improvement upon sash balances of the type mentioned.

Further in accordance with the present invention improved means is provided for operatively connecting the tape to the window sash.

The invention together with its numerous objects and advantages will be best understood from a study of the following description, taken in .connection with the accompanying drawings wherein is illustrated a preferred embodiment of the invention.

While the embodiment of the invention as g@ shown and illustrated is deemed to be preferred, it is to be understood that it is in nowise intended to limit the invention to the precise .ietails, construction and arrangement of parts herein shown and described, and that I claim all such forms of the invention to which I am entitled in view of the requirement of the prior art and the scope ci' the appended claims.

In the drawings:

Figure 1 is a sectional View showing the sash balance applied.

Figure 2 is a perspective view of an attachment for the window sash and constituting a guide for the tape and a means for detachably securing the tape to the sash.

Figure 3 is a sectional view taken substantially on the line 3-3 of Figure 1.

Figure 4 is a sectional View through the spring drum.

Figure 5 is a perspective view of a brake and pulley supporting bracket.

Figure 6 is a horizontal vsectional view taken substantially on the line 6 6 of Figure 1.'

Referring to the drawings by reference numer- 5 als 10 designates a portion of a vertical rail of a i window trame while 11 designates a portion of one vertical style of a window sash.

The improved sash balance comprises a casing 12 adapted to be mounted within the rail 10 and provided at one end with a face plate 13 secured in the groove of the rail through the medium of screws or other fastening element 14. The casing 12 is provided with a removable side plate 15 for access to the interior of the casing.

55 Rotatably iournalled between the side walls ot the casing 12 is the spindle or axis 16 provided for the spring drum 17.

Arranged within the drum 17 is a spring 18 that is secured at one end to the spindle 16 as at 19 as shown in Figure 4. The outer end of the spring is suitably engaged with the periphery of the drum as also shown in Figure 4 and designated by the reference numeral 20.

The drum 17 is provided on its periphery with a groove accommodating a tape 21 that is secured at its inner end to the periphery 0T the drum as at 22. The tape 22'works through an opening .23 provided therefor in the face plate 13 as shown in Figure 1. Means is provided for detachably securing the free end of the tape 21 to the sash and in this connection it will be noted that the rail 11 ci the sash is provided inlits upper portion with a groove in which fits a metallic channel member 24 that is provided at its upper end with an attaching plate 25 secured to the top ci the sash by screws or other seeming elements 26. At the lower end of the groove the sash 11`is provided with-a socket 27 receiving an extension or end 28 of the channel member 24, and inwardly from the end 28 one side of the channel member is provided with a shoulder 29 to rest on the4 shoulder of the sash rail 11 provided at the upper end of the socket 27 as will be understood :from a study of Figure `1.

Adjacent the end 28 the channel member 24 has an angular tongue 30 struck out therefrom and engageable in a slot provided in the free end o1 the tape 21 for detachably securing the tape to the window sash in the manner clearly suggested in Figure 1. An improved brake is also provided for retarding rotation of the drum 17, and said brake comprises a bracket plate 31 having adjacent each end thereof a pair of opposed slotted lugs 32 depending therefrom and

engaging guide pins

33, 33 extending between the sides e! the casing 12 as Will be clear from a study of Figures 1 and 3. Lugs 32 and

pins

33, 33 cooperate to constrain the plate 31 to swing ver-l tically. On the under side thereof intermediate its ends the plate 31 is provided with a brake shoe 34 of a type to engage the periphery of the drum 1n a manner to apply a braking action thereto.

At the end thereof nearest to the face plate 13 the bracket plate 31 is provided with spaced inclined ears between which is journalled a guide pulley 35 over which is trained the tape 21 as shown in Figure 1.

Connected with the plate 31 at that end thereof remote from'the pulley 35, and arranged within the casing 12 is a spring device which in the present instance consists of a coil spring 35' having one end thereof in hooked engagement with the plate 31 and its lower end welded or otherwise secured to a nut 38 screw threadedly engaged with a bolt 37 extending vertically upwardly from the bottom of the casing 12. Obviously by adjusting the nut 36 on the bolt 37 the tension of the spring 35' may be regulated as found desirable.

In order that the spring 18 may up when desired the drum spindle 16 is provided in one end thereof with a kerf 38 for receiving a screw driver or similar implement to rotate the spindle relative to the drum in a clockwise direction; while adjacent the other end thereof the spindle is provided with a squared intermediate portion, and-with the squared intermediate portion of the spindle there is engaged a ratchet wheel 39 that has the teeth thereof engaged by one end of a pivoted dog 40 mounted in the casing 12 to prevent retrograde movement of the spindle 16.

From the description of the invention thus far it will be seen that as the window sash is pulled downwardly against the tension ofthe spring 18 the shaft or spindle 16 is held stationary while the drum revolves about the spindle as an axis.

When the sash is at rest, in either an open or closed condition the parts are in the position shown in full line in Figure 1. Assuming that it is desired to slide the sash downwardly, it will be understood that upon downward movement oi the sash a pull will be exerted on the tape or ribbon 21, causing the plate 31 to swing to the dotted line position shown in Figure 1, the pin 33 acting as a fulcrum for the plate 31. Obviously plate 31 swinging to the dotted line position will cause the brake shoe 34 to move out oi engagement with the periphery of the drum thus permitting the drum to rotate for paying out the tape or ribbon 21. Obviously as soon as the sash comes to rest at the desired adjustment the pull on the ribbon or tape 21 will diminish sufllciently to permit the plate 31 to swing back to the full line position shown in Figure 1 for engaging the brake shoe 34 with the drum to prevent further rotation of the drum and thereby secure the sash at the desired adjustment.

When it is desired to raise the window, the sash israised orslidupwardlyin theusualmanner thus releasing tension on the tape or ribbon 21 so that the plate 31 under action of the spring 35.

will swing in a clockwise direction, pin 33' acting as a fulcrum for the plate. The swing of the plate in this direction will obviously move the brake shoe 34 out of engagement with the drum so that the latter is free to wind the tape or ribbon 21 thereon, as the sash is moving upwardly. When the sash comes to rest the parts will then return to their normal position for securing the sash at the desired adjustment.

Having thus described my invention, claim as new is:

1. In a sash balance, a casing, a spring drum rotatably mounted in the casing and a spring contained in the drum for rotating the same, a tape winding on the drum, a pair of spaced pins mounted bet'veen the sides of the casing, a plate supported by said pins and having slotted depending lugs engaged with .said pins, said pins serving as fulcrums for the plate, a brake shoe on the under side of the plate intermediate its ends and engageable with the drum for applying a braking action thereto, said plate having depending ears at one end, a roller journalled between said ears over which said tape is trained, a spring engaged at one end with the free end of said plate, and a spring tensioning device connecting the free end of said spring with the bottom of said casing. V

2. In combination with the drum and tape of a sash balance, a brake mechanism for said drum including a substantially horizontal plate, a. brake shoe on one side of the plate engaging the periphery of said drum, said plate adjacent each end thereof being provided with depending slotted lugs, flxedvpins extending through the slots of said lugs, one of said pins providing a fulcrum for the plate when the latter is swung in one direction to release the drum, and the other of said pins providing a fulcrum for the plate when the latter is swung in a reverse direction for releasing said drum, a guider pulley mounted on one end of the plate and over which the tape is trained for exerting a pull on said one end of the plate to swing the latter in one direction, and a coil spring anchored at one end and having a free end engaged with the end of the plate remote from said pulley for swinging the plate in a reverse direction when tension on the tape is released.

. JOHN P. PETERSON.

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