US112985A - Improvement in sash-holders - Google Patents

Description

dimi @mw Letters Patent No. 112,985, dated March 21, 1871.

iEdPRVEMENT IN SASHHOLDERS.

' The Schedule referred te in these Letters Patent and making part of the same.

I, ALEXANDER TnoMsoN, of Champaign Uity, in the county of Champaign and State oi' illinois, have invented a certain Friction Window-Lock, lof which the following is a speciiication.

bjeot of the Invention.

The object of the invention is to -make a strong and' efcient automatic lock, and to hold the window down or in any other position by means of friction, in such n manner as not to deface the jamb-ofthe window.

Description of the Accompanying Drawing.'

Figure 1 is a perspective view.

` Figure 2 is av vertical section.

General Description. A'is a key having two inclined faces, i) and t', the

inclination being such that the tangents of the angles,v

which the faces-make with jamb D, shall be less than the coeiiicient of friction; or, in other'words, that the roller B will roll onto b or i, as the casey may be, in-v stead of slipping on jamb D.

The side of key A, which bears against jamb D, is not a perfect plane, but. is bent at c, as shown in iig. 2, this being done to prevent roller B from breaking it atc. v

The surface of key A, which bears against jamb D, is of sufficient area from c to either end as to prevent it from defacing jamb D.

O is a case which is fastened to sash E by means of three screws, e, Z, and f, inside of which is placed the roller B, through which the screw f passes, forming a bearing for roller B.

Boiler B should be placed sufficiently close to key A as to nllo'w key A but little upward or downward motion, which may be regulated by placing projection I almost in contact with jamb D.

The key A is held in its place by the projection I on case C, l

Oase G may be dispensed with, and roller B heldin position by one screw of sufficient strength, and key A heldin place by means of a fiange on roller B instead of the projection I.

This lock operates in the following manner iii/'hen the window is down and force applied to raise sash E, roller B moves up the inclined'face b, causing ypressure upon jamb D and also upon the jamb at the opposite side ofthe window, which causes friction betw'een thev sash and the opposite jamb, and also between key A and jamb D, thus `preventing the sash,

from rising. By raising key A so that the inclined face i comes in contact with roller B, and holding it in this position, sash E is free to move upward. After sash E has been raised to the desired height,rby still keeping the facci in contact with roller B, and releasing the hold upon sash E, the force of gravity causes roller B to press upon the inclined face-i, causing friction between the opposite side of the sash and the opposite jamb, also causing'friction between key A and jamb D, thus preventing the sash from passing down. 12o let the window down, raise the sash .sufficient to free key A, which drops, bringing the inclined face b in contact with roller B, the force of gravity holding it in this position, thus allowing sash E to. move down freely, roller B still being in contact with the inclined face b.- The sash is locked, as before described, thus making it an automatic lock.

Claim.

- I claim- The combination of the double-beveled key A, the case G holding the key, with its ange, and containing a roller B, all arranged as set forth. v

ALEXANDER THOMSGN.

Witnesses:

R. E. Moolen, d. B. WATKrNs.

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