US1191815A - Window-lock. - Google Patents

Description

C. NELSON. wmnow LOCK.

11915. 1,191,815. Patented July 18, 1916.

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CARL- NELSON, or BROCKTON, rinssAcifusnr'rs.

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Specification of Letters Patent. v

Patented July 18,1'9Lffi Application filed November 9, 1915. Serial No. 66,546;

[b all whom it may concern Be it known that I, CARL NELSON, a citizen of the United States,'residing at Brockton, in the county of Plymouth and State of lliassachusetts, have invented certain newand useful Improvements in Window-Locks; and I do hereby 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.

This invention relates to new and useful improvements in window locks and the principal object of the invention is to provide a sash lock which is adapted to be attached to a window of the ordinary construction without in any way changing the same.

Another object of the invention is to provide a sash lock which is arranged to secure both the upper and lower sashes against movement and to frustrate any attempt made by unauthorized persons to open the window.

Still another object of the invention is to provide a simply constructed device which is adapted to be adjusted to fit win dows of different sizes without in any way changing the construction thereof.

With these and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specification and accompanying drawings, in which:

Figure 1 is a perspective view illustrating the device in use, and Fig. 2 is a sectional view through Fig. 1.

Referring to the drawings, the numeral 1 designates the lower sash of the window while the numeral 2 designates the upper sash. These sashes are mounted to slide beside each other in the usual manner and secured to the upper side of the upper rail of the lower sash is the base plate 3 of the device. The base plate is provided at its rear edge with a plurality of spaced notches at forming the shoulders 5 against which the rear end of the locking arm abuts. Secured to the rear end or formed integral therewith whichever is the most preferred, are the upwardly extending arms 6 provided with the forwardly arched arms 7 which extend at parallel relation over the upper face of the plate 3. These arms 7 form guards for retaining the locking arm in place.

The locking arm above referred to is des ignated by the numeral 8 and is provided at its rear end with the downwardly extending tongue 9 which is adapted to engage n the notches 4 and against the shoulders 5'. A pair of laterally extend ing projections 10 are formed at the point where the tongue 9 joins the arm 8 and these extensions engage the under sides of the hooked arms 7 as clearly shown in the drawing. The forward end of the arm 8 is provided with a suitable head or shoe 11 I having a friction pad 12 formed at the outer face thereof which friction pad is preferably curved as illustrated in the drawings and is adapted to engage against the inner face of one of the side rails of the upper sash.

It will be apparent from the foregoing that in use the plate 3 is secured to the upper side of the upper rail of the sash by suitable screws or in any other suitable manner and the arm 8 is adjusted in the notches 4 so that the friction pad will ongage the upper sash 2. It will thus be seen that slight variations of thickness of the upper sash may be allowed for through the adjustment of the tongue 9 in the notches and upon upward movement of the lower sash or downward movement of the upper sash, it will be apparent that the friction pad 12 will bind against the side rail of the upper sash thereby exerting pressure on the arm 8 which in turn bears against the shoulders 5 and thus lock the window against movement. It is to be understood that if so desired in order to further facilitate the operation of the device a suitable retractile coil spring may be connected between the arm 8 at a point near its outer end and the plate 3 at a point near its inner edge to exert pull on said arm and normally hold the friction pad in engagement with the upper sash 2.

It is to be understood that when the lock is not in use the locking arm can be lifted and held in upright position by the arms or guards 7 due to the frictional engagement of the projections 10 with the under sides thereof.-

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be madein the combination and arrangement of parts as will fall within the spirit and scope of the app n d claim What is claimed is A window lock comprising a plate provided with a plurality of spaced recesses, a locking arm having an angular down-turned 5 end adapted to engage said recesses when said lock is in use, a pair of upwardly extending arms secured to the rear end of said plate, the free terminals of said arms being provided with arched arms extending 10 forwardly over the face of said plate in parallel relation, and a pair of laterally ex tending projections formed on said arm at opposite sides thereof adapted to engage said arched arms thereby preventing the angular end from riding outof said notches 15 and forming a means to swing said arm out of engagement with a window.

In testimony whereof I aflix my signature in presence of two witnesses.

CARL NELSON.

Witnesses:

CHARLES A. NORLING, CARL D. FYHR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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