US1960543A - Open window sash lock - Google Patents

Description

May 29, 1934. A. H. MAGUIRE 1,960,543

OPEN WINDOW SASH LOCK Original Filed April 28, 1932 Patented May 29, 1934 UNITED STATES PATENT? OFFICE Application April 28, 1932. Serial No. 607,988 Renewed March 12, 1934 4 Claims.

My present invention relates to window locks and. more particularly to a lock which will keep the two sash members of a window in a locked relation when one of the sash members has been 5 slightly opened.

Heretofore, most window locks have been designed to hold the sash members in a locked closed position. In my improved invention I have designed a sash lock which can only be operated from the inside of the house but yet allow the window to be opened a short distance for ventilation purposes.

The principal object of my invention therefore is an improved open window sash lock;

Another object is an open window sash lock which cannot be operated from the outside of the window when the lock is in operating position;

Other objects and novel features comprising the construction and operation of myinvention 20 will appear as the description of the same progresses.

Referring to the drawing illustrating the preferred embodiment of my invention;

Fig. 1 is an inside elevation of a window frame and sash showing my improved lock in operation;

Fig. 2 is an exaggerated cross-section taken on the line 2-2 of Fig. 1;

Fig. 3 is another cross-section similar to Fig. 2 but showing the lock in an open position;

I 30 Fig. 4 is a cross-section taken on the line 44 of Fig. 2;

Fig. 5 is a plan view of the lock catch member removed from the locking lever, and

Fig. 6 is another view of Fig. 5 taken at ninety degrees thereto.

Referring more in detail to the drawing, 10 designates a window casing within which are mounted two slidingsash members 11 and 12. Theupper sash 11 is provided at one or both sides 40 with an insert member comprisingside frames 13 and 14 which may be composed of one piece or of two pieces as shown in the drawing being securely held together in any suitable manner asrivets 15, bothmembers 13 and 14 being secure- 1y held in arecess 16 provided in thesash 11 by means ofwood screws 17. The central portion of themembers 13 and 14 comprises aslot 18 in which is pivoted at 19 alocking lever 20 the pivoted end of which is provided with an off-set dog member 21 which is adapted to lie over the top of thelower sash 12 when the window is in a locked position as shown in Fig. 2. It will be noted in Fig.2that when the windowisinalocked position the long lever portion of the pivoted member, indicated in general at 22, lies in the lower portion ofslot 18 and flush with the outer side of thesash 12 such that thesash member 11 may be raised but cannot be lowered because of thedog member 21. The locking device should be so proportioned and located in thesash 11 that the upper edge of thesash 11 is within a fraction of an inch from being seated when thelever 22 is high enough to swing outward over the top of thesash 12. Arecess 23 is provided in thesash recess 16 to allow thedog member 21 to pivot around to a rear position as shown in Fig. 3. In Fig. 3 thelever 20 is in an open position such that thesash 11 may be slid up or down past thesash 12. It will therefore be seen that so long as thelever 20 remains in a position like that shown in Fig. 2 it will be impossible for anyone on the outside of the window to either push down the upper sash further than thedog 21 will permit or to push up the lower sash any amount larger than the opening provided above the upper sash, and it is also impossible for anyone to insert any instrument over the upper sash or under the lower sash for the purpose of changing the position of thelever 20.

In order to prevent thelever 20 from becoming displaced when in an open position as shown in Fig. 3, I have provided asimple catch member 25 slidably mounted in thelever 20 in aslot 26. Aslot 27 is also provided in thelever 20 and located at ninety degrees to theslot 26. The catch member consists of two bar-like members located one above the other and positioned at ninety degrees to each other such that theupper bar portion 28 operates in theslot 26 while thelower bar portion 29 operates in theslots 27. On the side portions of themembers 13 and 14 are providedbayonet slots 30, theopen portion 31 of thebayonet slots 30 facing the inside of the window sash such that when thecatch 25 is in an extreme upward position and thelever 20 swung into the opening 18 of the frame the ends of thebar member 29 will enter the opening 31 of the bayonet slot and may then he slid downward thereby locking thelever 20 in place. In a like manner thelever 20 may be locked in its other position as shown in Fig. 2. The side of thelever 20 may be slightly relieved at apoint 35 adjacent the area surrounding the ends of thebar portion 28 such that the finger of the operator is able to engage the ends of theportion 28 of thecatch 25 for the purpose of sliding it up or down in theslots 26 and 27.

Having thus described my invention what I claim as new is:

1. A window sash lock comprising a casing member inserted in one side of the upper sash, a dog member pivoted in said casing and comprising an outstanding portion located at one end and to one side of said pivot and a tongue member adapted to fit in said casing, means located in said tongue portion of said dog member adapted to slide in bayonet slots located in said casing member for the purpose of locking said dog member in a vertical position.

2. A window sash lock comprising a casing member provided with slotted end portions, a split dog member pivotally disposed in said casing and provided with a tongue portion, a pin member slidably disposed through said tongue member and adapted to engage with said slots.

extremity of the said dog member adapted to engage with the said slots in the casing.

ARTHUR H. MAGUIRE.

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