US1380545A - Latch for doors - Google Patents

Description

J. A. EDGERLY.

' LATCH FORDOORS. APPLICATION FILED MAR. 4, 1920 1 380 545 Patented June 7, 1921.

UNHTEEJD SATES PATNT QFFEQO JOHN A. EDG-ERLY, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE-F TO MATTHEW EDGERLY,-OF BROOKLIN'E, MASSACHUSETTS.

LATCH FOR DOORS.

Specification of Letters Patent.

Patented June t, 1921.

T 0 all whom it may concern:

Be it known that 1, JOHN A. EDGERLY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Latches for Doors, of which the following is a specification.

This invention relates to a latch for doors, the object of the invention being to provide a strong and simple means for preventing the movable latch member, or bolt, from be ing disengaged from the striker plate into which said locking member projects, by unauthorized means, such as forcing said latch member out of engagement with the plate on a door casing by pushing said member back with a thin piece of metal-or with a knife blade; and also the invention is adapted to prevent a door being forced open by means of a jimmy.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings:

Figure 1 is a perspective view of a portion of a door with my improved latch attached thereto; 1

Fig. 2 is a perspective view of the casing of the door with my improved latch plate attached thereto;

Fig. 3 is a transverse section taken through the latch and plate and showing the door and door casing in connection therewith;

Fig. 4 is a lan view of a modified form of latch mem er.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings: 5 is a latch of a construction well-known to those skilled in the art. the same being shown in a door 6. The knob 7 is adapted at all times to operate a latch member 8 which, in this case, consists of a horizontally movable member.

The latch 5 is provided with two push members 9 and 10 which are alternately operated to throw a knob 11 into engagement with the member 8 or out of engagement therewith in a manner well-known to those skilled in the art and when said knob is out of engagement, the movable-latch member is operated by a key from the outside of the door. The latch 5 is provided with a front plate 12 which is fastened to the front edge of the door 6 and has a channel-shaped recess 13 extending thereacross and the movable member 8 is provided with a vertical groove 14 extending across one face thereof. 15 is the casing of a door and has a striker plate 17 fast thereto similar to the ordinary striker plates well-known to those skilled in the art, except that it has a projection 18 thereon, which is provided with a hole 19. \Vhen the door is closed as in Fig, 3 the member 8 projects into the hole 19 and its outer end is entirely inclosed by said projection and under normal conditions said-member can be moved transversely of the plate 17 and into and out of the hole 19 by a spring not shown in the drawings and by the handle 7 respectively. The knob 11 is on the outside of the door and unless it is desired to leave the door so that anyone can open it from the outside, this knob is disengaged from the member 8. If anyone tries to force the door 6 open by inserting a jimmy or other tool between the portion 20 of the, door casing and the door, as at the point A, it will be seen that the door will be forced in the direction of the arrw B, Fig. 3, and as the door is also forced in the direction of the arrow C by the pressure of said jimmy, the member 8 will bemoved in the direction of the arrow C until the.

slot 14 arrives in alinement with the edge 21 of the hole 19. whereupon the edge 21 will enter the slot 14 and lock the member 8 to the plate 17 thus locking the latch 5 and the door 6 to the striker plate 17 and to the casing 15.

To force the door apart from the casing under these conditions, it will be necessary to tear the door and casing to pieces. It will also be seen that in order to pick the latch that is to move the member 8 rearwardly out of alinement with the plate 17, it will be necessary to get the tool which is being used, such as a knife blade around the edge of the plate 17 at 22 and into the hole 19. This would be a "cry diflicult,'in fact practically an impossible, operation toperform. for the reason that the outer end of the member 8 or all of that portion of the member 8 which extends outwardly beyond the plate 12 is entirely inclosed within the projection 18, both on its upper and lower faces and upon its front and back faces. In doing this also pressure will be brought to bear which, if the member 8 could be by such means retracted, it would when the slot 14 arrived opposite the edge 21 be moved laterally thereof, so that said edge would enter said groove and the member 8 and plate 17 would then be locked together.

It is evident that while it is preferable to provide the member 8 with the vertical groove or slot 14, said groove or slot might be also applied to the locking member 23,

ig. 1. It will be still further understood that the groove 14 may be replaced by a recess 24 as seen in F ig. 4 in the modified movable member 25, such a recess would leave a lip 26 on the movable member which, when said member is moved laterally of its normal direction of movement, would interengage with the edge 21 of the plate 17.

I claim:

1. A latch embodying a front plate adapted to be fastened to the front edge of a door and having a channel-shaped recess extending horizontally thereacross, a horizontally movable member in said latch adapted normally to project through said front plate and into said recess and having a vertical slot in one face thereof, a striker plate adapted to be fastened to a door casing, and a pro-- jection on said striker plate adapted to enter said recess when said door is closed, said projection having a hole therein adapted to receive and entirely inclose the outer end of said horizontally movable member when the same is in advanced position, said projection at one side of said hole being adapted to project into said vertical. slot when the door is moved laterally there-of to prevent said member and striker plate from being disengaged from each other.

2. A latch embodying a front plate adapted to be fastened to the front edge of a door and having a channel-shaped recess extending horizontally thereacross, a horizontally movable member in said latch adapted normally to project through said front plate and intosaid channel-shaped recess and having a recess in one face thereof, a striker plate adapted to be fastened to a door casing, and a projection on said striker plate adapted to enter said channel-shaped recess when said door is closed, said projection having a hole therein adapted to receive and entirely inclose the outer end of said horizontally movable member when the same is in advanced position, said projection at one side of said hole being adapted to project into said recess in one face of said horizontally movable member when the door is moved laterally thereof, whereby said horizontally movable member and striker plate are prevented from being disengaged from each other.-

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRANKLIN E. Low, HERMAN R. HOFFMAN.

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