US135217A - Improvement in sash-locks - Google Patents

Description

Sash-Locks.

I Patented Jan. 28,1873.

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CHARLES T. GIBSON, OF BALTIMORE, MARYLAND.

A IMPROVEMENT IN SASH-LOCKS.

Specification forming part of Letters Patent No. 135,217, dated January 28, 1873.

To all whom it may concern:

Be it known that I, CHARLES T. GIBSON, of the city and county of Baltimore and State of Maryland, have invented a new and useful Improvement in a Combined Sash Locking and Lifting Device; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in which Figure 1 is a back view of the lock indicatin g the parts in the positions they assume when the bolt is drawn back. Fig. 2 is a similar view of the same parts indicating them in the positions they assume when the bolt is holding the sash down. Fig. 3 is a front view of the lock-plate. Fig. 4 is a vertical section taken transversely through the same.

Similar letters of reference indicate corre- 7 sponding parts in the several figures.

combination and arrangement of the vertically-vibrating lifting-lever knob or buttons, the angular pushing-lever and sliding spring-bolt in the manner herein represented, whereby the upper and shorter armof the angular lever rests with a sliding contact upon the top of the lifting-lever forward of the fulcrum of said lever, and at the same time the long arm of the pushing-lever passes centrally down through an oblong slot in the bolt and bears with a sliding contact against said bolt with a force directly in line with its movement. By this arrangement the movement of the lifting-lever is efl'ected by simply an upward force applied in a direct manner instead of by a force applied in a lateral curvilinear direction. Besides this, the necessity of using a purchase below the lifting-lever is avoided,

. for, by my arrangement of the lifting-lever the shoulder of its button or knob is isolated from the front plate of the look, and its fulcrum is the parts which communicate the force to the bolt, when the same force which releases the bolt is continued upon the lifting-lever for the purpose of raising the sash.

The following description will enable others skilled in the art to fully understand it.

In the accompanying drawing, A represents the lock-plate, which may be made in the form of a shield or of any other desired form. 13 represents a rectilinear sliding bolt-head, which is guided between studs on which are applied caps on a, and into which a long bolt, b, is screwed. A slot, n, is made vertically through the plate A at the middle of its width through which a lever, g, is passed, which is pivoted at 0 between lugs 15 i on the back of this plate, and which is constructed with a finger-lift or handle, 9, on its outer end, as shown in Figs. 3 and 4. 0 represents an angular lever, which is pivoted to a stud, e, and which is constructed with a nose, 0, and a retracting portion, 0. The nose or upper arm 0 of the lever G bears upon the lever 9 near the pivot o, and the retracting-arm c of the lever (l bears against a shoulder on the bolt head B, the latter being acted on so as to pass it in the position shown in Fig. 2, when unrestrained, by means of a light spring, .9, which is coiled around a stud, t. The lower rail of the sash is recessed to receive the working parts of the lock on the plate A, and also bored out to receive the bolt 1), which is screwed into its head B after the plate A is secured in its place.

When the bolt is shot its end enters one of a number of holes made for it into the sashframe, and this bolt should be long enough to allow the plate A to be applied at the middle of the length of the sash-rail.

It will be seen from the above description that in the act of lifting a sash by the knob or handle g of lever g the first lifting impulse will first retract the bolt 1) from the sash-frame. The bolt will afterward be held back by the weight of the sash on the knob g. At the moment the lifting force ceases the spring 8 will shoot the bolt into one of the holes made into the sash-frame, thus holding the sash in the position where it was left.

In order to have a sash-lock with a liftingknob applied to it work practically, it is necessary that the knob should work freely and always retract the bolt before the sash is started, otherwise the attempt to lift the sash will cause the locking end of the bolt to bind, and the greater the lifting force the harder will the bolt bind. I have obviated this objection by combining with a pivoted lifting lever and knob the retracting-lever G, which transmits the lifting force directly to the bolt-head.

Having described my invention, what I claim as new, and desire to secure by Letters Patcut, is-

.The combination of the lever-button o'r le yer-knob g g, the angular pushing-lever 0, its short arm 0', bearing with a sliding contact upon the lifting-lever forward of the fulcrum thereof, and the spring sliding bolt B b, the whole being constructed and applied to the sash-plate A, substantially as and for the pur pose described.

CHARLES T. GIBSON.

Witnesses:

N. J. STOWELL, WILLIA G. KEPLER.

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