US2429873A - Safety window lock - Google Patents

Description

Oct. 28, 1947. E. B. EVANS 2,

SAFETY WINDOW LOCK Filed March 9, 1945 2 Shets-Sheet 1 INVENTOR.

Oct. 28, 1947. v E. B. EVANS SAFETY WINDOW LOCK Filed March 9, 1945 2 Sheets-Sheet 2 INVENTOR. zf/merfi' Ed 776 ATTORNEYS Patented Oct. 28, 1947 UNITED STATES PATENT OFFICE SAFETY WINDOW LOCK Elmer B. Evans, Los Angeles, Calif.

Application March 9, 1945, Serial No. 581,808

1 Claim. (Cl. 292-182) My present invention in its broad aspect, has to do with improvements in window or sash locks, and more particularly, it is my purpose to use a friction locking member to engage an element of the window frame, and a cam lever for moving the friction element in engagement with the frame, and spring means for releasing the lock when the cam lever is moved to an inoperative position. Furthermore, I provide a lock for both the lower and upper sash, the lock for the upper sash being countersunk, and my lock is simple, sturdy, practical and easily mounted on a conventional window sash and has no parts which are likely to bind or stick, or become broken or deranged or out of order.

Other and equally important objects and advantages of my invention will be apparent from the following description and drawings, and it is to be understood that changes in form, size, shape, materials, and construction and arrangement of parts is permissible and within the purview of my broad inventive concept and the scope of the appended claim.

In the drawings wherein I have illustrated a preferred form Of my invention:

Figure 1 is an elevation, partly fragmentary of my-lock applied to a lower sash;

Figure 2 is a section on the line 22 of Figure 1;

Figure 3 is a section on the line 3-3 of Figure 1;

Figure 4 is a top plan view of my lower sash lock with the cover plate removed to show theoperating parts;

. Figure 5 is a section on the line 5-5 of Figure 1;

Figure 6 is an elevation, partly broken away, to show my upper sash lock applied;

Figure 7 is a plan view of my upper sash lock with the cover removed to show the working parts;

Figure 8 is a section on the line 88 of Figure 6,

and

Figure 9 is a section on the line 9-9 of Figure 6.

In the drawings wherein like characters of reierence are used to designate like or similar parts:

The numeral l designates a window frame and 2 the stop strip, while 3 and 4 designate the upper and lower sash respectively, each having side rails 5. 'The window and sash are of conventional construction.

Mounted on the side rail 5 of the lower sash 4 to engage the stop strip 2 is my sash lock'i which has a casing 1 formed with a flat base section 8 with along flange 9 on one side edge and a short flange H) on the other side edge, these flanges being bent to form edge locking lips ll engaging in recesses I2 in the side walls of the top cover plate II which has an open front and back end. The casing is held in place on the side rail 5 by screws M. The operating parts are mounted on the base section 8. and include an arcuate locking foot having a. serrated or toothed ed8e IB'to covered as at lGa if desiredand is rotatably held in place by a rivet lI passing through the plate I8 and having a square head IS. The foot has an upstanding lug 20 engaged by a spring 2| which has a straight portion 22 passing through a slot 23 in upstanding flange 24 on the plate It to engage a rivet 25 on which is rotatably mounted a cam lever'26, the cam element 21 of which bears against the flange 24 of plate ill to move the foot into and out of engagement with the stop strip 2. The plate has an attaching lug 2B engaging in a slot in the base section 8. In operation, the foot is normally returned to inoperative position by the spring 21 but iscammed to a locking position by the lever 26.

The casing 29 of my upper sash lock is similar to the casing of the lower sash lock, but it is countersunk as shown in Figures 8v and 9 in the sash rail to lie flush with the surface thereof. An angular camming plate 30 has an operating lever 3| passing through a slot 32 in the cover plate and is movable to engage the angular camming end 33 of the plate 34 for actuating the foot which engages the adjoining window frame-see Figure 8-instead of the stop strip 2.

From the foregoing, it is believed that'the operation and advantages'of my invention will be apparent, but it is again emphasized that interpretation of its scope should only be conclusive I claim:

A window lock, comprising a casing, an arcuate locking foot, a plate on the casing on which the foot is pivotally mounted, the plate having an upstanding end flange a vertical slot in said flange, a camming lever, a rivet pivotally mounting the camming lever in the casing, a spring passing through the slot in said flange to engage the pivot for the foot at one end and the rivet at the other, and the camming lever movable to engage the flange on the plateto urge the plate and foot into locking position against the tension of the spring, a slot formed in said casing underlying said plate and a lug on said plate for engagement in said slot to prevent lateral displacement of said plate.

ELMER B. EVANS.

REFERENCES crrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 111,524 Drott i Feb. '1, 1871 788,165 McFadden Apr. 27, 1905 1,103,229 Vance July 14, 1914 1,626,007 Mitchell Apr. 26, 1927

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