US1950176A

US1950176A - Window lock

Info

Publication number: US1950176A
Application number: US592765A
Authority: US
Inventors: Laurence N Hoffman
Original assignee: SHELBY METAL PRODUCTS Co
Current assignee: SHELBY METAL PRODUCTS Co
Priority date: 1932-02-13
Filing date: 1932-02-13
Publication date: 1934-03-06
Anticipated expiration: 1951-03-06

Description

March 6, 1934. L. N. HOFFMAN WINDOW LOCK Filed Feb. 15, 19,52

INVENTOR. L aural: ce /Vflo ffhzan 9 A TTORNE Y5 Patented Mar. 6, 1 934 UNITED STATES PATENT OFFICE WINDOW LOCK Laurence N. Hoffman, Shelby, Ohio, assignor to The Shelby Metal Products Company. Shelby, Ohio, a. corporation of Ohio Application February 13, 1932, Serial No. 592,765 1 Claim. (01. 292-242) hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:

Fig. 1 is a fragmentary perspective view of a window construction showing the locking device constructed according to the principle of my invention in position thereon; Fig. 2 is a transverse sectional view of Fig. 1; Fig. 3 is an enlarged sectional view of my locking device; Fig. 4 is a section taken substantially on line 4-4 of Fig. 3.

Referring more particularly to the drawing, in Fig. 1 thereof I have shown the usual window construction consisting of the lower frame 1 and the upper frame 2. These two frames, it is obvious, are movable in a directionparallel to each other, and it is the purpose of the present invention to provide a means which will prevent such movement in one direction while permitting it in the other.

My locking device, therefore, which is shown in attached position upon the upper horizontal window frame member 3, consists of a base plate 4 having the upwardly extending

bifurcated projections

5 and 6. On each end of the base plate 4 are the downwardly depending flanges 7 and 8. The flange '7 has an inwardly projecting pointed lug 9 which is adapted to engage with one side of the window frame 3. A set screw 10 is positioned in the flange 8 and has a relatively sharp point 11 for engagement with the opposite side of the window frame. The shoulder portion 11 between the sharp point 11 and the thread portion of the screw 10, is slightly tapered. The purpose of such a taper is to prevent an excessive imprint or marring into the wood of the window frame, such as would be caused by sharp shoulder at this point. The slot 12 in the head of the screw 10 is made of sufficient size in order that a coin may be inserted therein whereby the locking device may be readily installed or removed in a satisfactory manner without necessitating the use of any particular tool.

A lever arm 13 is pivotally mounted between the flanges 5 and 6-by means of lateral extensions extending through the holes 14 in such flanges.

The outer end of the lever arm 13 is bent back upon itself and curved into the U-shaped form 15. A rubber insert 16 is adapted to be clamped securely within the U-shaped portion 15. It will be seen that the outer surface of the rubber insert 95 16 is slightly corrugated or roughened and extends beyond the metallic portions of the lever arm 13.

Referring to Fig. 2, it will be seen that the lever arm 13 is adapted to make contact with the win- 7 dow frame 2 by virtue of the gripping action of the rubber insert 16. Further attempted upward movement of the frame 1 or downward movement of the frame 2 sets up an increased wedging action through the lever arm 13 which is sufficient to prevent further movement of the window frames with respect to each other.

The outwardly extending end 17 of the lever arm 13 is inclined upwardly and serves as an operating lever for disengaging the locking device. A flat spring 18 is clamped to the base plate 4 and bears against the under side of the upwardly curved portion 1'7 of the lever arm 13. The pressure of the spring 18, therefore, tends to force the lever arm 13 toward its downward position as 95 shown in Fig. 3.

In cases where it is desirable to render the locking device inoperative, the portion 17 may be depressed to a point below the holes 19 in the

side flanges

5 and 6. A nail, pin, or match may then be inserted through the holes 19, and will serve as a means for retaining the lever arm 13 in inoperative position, substantially as indicated by the dotted lines in Fig. 2.

The above described device is one which may be quickly and economically manufactured, since sheet metal stock may be used both for the base plate and locking arm. It produces a locking action automatically regardless of whether the window is opened or closed. Furthermore, due to the novel form of construction whereby the rubber insert is clamped in position upon the device, it may be used as a means for eliminating window rattles. Such clamping construction tends to slightly extrude the rubber insert and to maintain the resilient qualities of the rubber.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means upwardly and its other end reversely bent into nearly cylindrical form, a rubber bearing member compressibly held in said cylindricaliy i'ormed portion, and laterally projecting lugs on said strip, said lugs extending into said apertures to pivotally mount said locking member between said flanges.

LAURENCE N. HOFFMAN.