US3306644A - Window lock - Google Patents

Description

T. LARSEN Feb. 2, 1967 WINDOW LOCK Filed Nov. 23, 1964 I NVEN TOR.

7QYG 1/5 4255A/ `v TTORNEYS United States Patent Oiiiice 3,306,644 Patented Feb. 28, 1967 The present invention relates to improvements in locks for double hung window sash. The present invention provides a window lock which compensates for slight vertical and transverse displacement between the two sash members, and thereby provides a secure lock regardless of such displacement.

In accordance with the present invention, I provide a cammin-g type lock member including a camming latc-h having a hook shaped leading end portion, and being pivotally secured to one of the rails cooperating lto dene the window meeting rail. The camming latch has a hook shaped leading end portion which is progressively tapered so that it has its smallest cross sectional area at its extremity. The camming latch cooperates with a keeper member secured to the other of the rails of the window sash, the keeper having a channel therein with an arcuately shaped inlet end and a progressively decreasing thickness. Thus, when the camming latch is pivoted, the hook shaped end is freely received within the arcuately shaped inlet end, and the resulting carnming action resulting from further pivotal movement of the camming latch within the channel acts to draw the camming latch and the keeper into locked engagement with each other. This type of engagement the-reby cornpensates for slight vertical or lateral `displacement between the rails and the two window sash members and assures a tig-ht lock under these circumstances.

An object of the present invention is to provide an improved window lock assembly for double Ihung window sash, which, compensates for some vertical and lateral displacement between the locking members.

Still another object of the invention is to provide a positively acting window lock which can be economically manufactured.

Other objects and features of the present invention will -be apparent to those skilled in the art from the -following description of the attached s'heet of drawings which illustrates a preferred embodiment of the invention.

In the drawings:

FIGURE 1 is a view in elevation of a typical double hung window sash to which the lock of the present invention can be applied;

FIGURE 2 is a plan View, partially broken away to illustrate the construction of the lock assembly, and showing the lock assembly in both its engaged and disengaged position;

FIGURE 3 is a cross-sectional View taken substantially along t-he line III-III of FIGURE 2; and

FIGURE 4 is a side elevational View of the keeper assembly of the invention, taken alon-g the line IV-IV of FIGUR-E 3. y

As shown in the drawings:

In FIGURE 1, reference numeral indicates generally a conventional type of double hung window sash including an upper sash member 11 and a lower sash member 12 carrying panes of glass 13 and 14 respectively. The lower rail of the upper sash member 11, identified at reference numeral 16 is Varranged to cooperate with the upper rail member of the lower sash member 12, identified at reference numeral 17 to provide the meeting rail for the double hung window.

A mounting plate 18 is secured to the rail i7 as by means of screws 19. Mounted on the plate 18 is a pivot engage in camming relation.

pin 21 which provides the pivotal axis for a camming latch generally indicated at reference numeral 22 in the drawings. The latch 22 has a straight trailing end portion 23 and a hook shaped leading end portion 24. As best seen in FIGURE 3, the leading end portion 24 is diminishingly tapered at its rforward extremity.

The camming latch 23 is arranged to cooperate with a keeper generally indicated at reference numeral 26 in the drawings and secured to the rail 16 yby means of a mounting plate 27 and screws 28. The keeper 26 includes an overhangng bar member 29 which cooperates with the mounting plate 27 to define a channel 31, as best seen in FIGURE 4. It should be noted that the width of the channel progressively decreases from right to left as viewed in FIGURE 4, and that an aperture 32 is provided intermediate the ends of the channel 31. From FIGURE 2 it will be observed that the inlet end of the channel has an arcuate camming surface 33 against which the inner periphery of the hook shaped leading end portion 24 of the latch 22 is arranged to Thus, pivotal movement of the latch `22 about the pivot pin 21 causes the hook type end portion 24 to bear against the camming surface 33, and pull the keeper 26 into secure locked engagement with the latch 22. At the same time, the extreme end portion 34 of the latch 22 is arranged to be received in seated relation within the aperture 32.

At the inlet end of the keeper 26, the space between the bar 29 and the upper surface of the mounting plate 27 is significantly greater than the thickness of the extremity 34 of the latch. Thus, upon initial engagement of the latch 22 with the socket 26, some variations in the vertical positions of the rails 16 and 17 can be tolerated, since once the camming action begins, the latch 22 serves to draw in the keeper into secure locked engagement. Similarly, if there is some lateral displacement of the latch 22 with respect to the keeper 26, the initiation of the camming action corrects this disparity, and achieves a secure locking action between the two parts.

From the foregoing, it will 4be understood that the window lock of the present invention provides an economical, .but highly effective Window lockin-g structure for doulble hung window sash, making it possible to secure complete locking action even when there is some misalignment between the sash members.

It should also be understood that various modifications can be made to the described embodiment without departing from the scope of the present invention.

I claim as my invention:

A latching means for securing double hung window sash to their meeting rails comprising a substantially at latch element formed with an elongated handle portion which curves at one end to form an elongated arcuate camming edge portion, and a laterally extending portion -adjacent said camming edge portion provided with pivot means therethrough and mountable on one such sash; and a keeper mountable on the other sash and formed with a pair of superposed substantially dat portions spaced toreceive said camming edge portion and joined along adjacent edges by a web; said web forming at one end a curved inner surface engageable in a camming relationship w-ith said camming edge portion, and at the other end with a separate, spaced web portion havin-g an edge surface forming a stop for the end of said camming edge portion, a surface of said camming edge portion and an adjacent surface of one of said superposed portions of said keeper being matirrgly inclined to provide, with the aforementioned camming, a tighten- 3 4 ing of said sash in two directions during engagement of 2,647,789 8/1953 Chayne 292-96 said latch element and keeper. 3,160,433 12/ 1964 Chieger et a1. 292-241 References Cited by the Examiner FOREIGN PATENTS UNITED STATES PATENTS 5 28,6126 1902 Great Britain. 21,328 8/1858 Falconer 292-101 10244 1913 Great Bntam 2311,401 8/1880 Cleaveland 292-108 584,343 6/1897 Fmelich 292 103 EDWARD C. ALLEN, Przmaly Examzner.

2,531,256 11/1950 Clasen 292-241 X RICHARD E. MOORE, Examiner.

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