US1094602A - Self-locking latch. - Google Patents

Description

E. A. scHRElBER. SELF LOCKING LATCH.

APPLICATION FILED JULY 30, 1912.

Patented Apr. 28, 1914.

EDlVARD A. SCHREIBER, OF CHICAGO,

ILLINOIS, ASSIGNOR- TO CHICAGO CAR HEAT- ING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SELF-LOCKING LATCH.

Specification of Letters Patent.

Patented Apr. 28, 1914:.

Application filed July 30, 1912. Serial No. 712,336.

To all whom it may concern:

Be it known that I, ED1VARD A. SCHREIBER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful Improvements in Self-Locking Latches, of which the following is a specification.

My invention relates to latches for doors and the like, and has for its object to provide a novel device for holding a latch in its operative position which automatically locks the latch when the door is closed and is so constructed and arranged to be very quickly and easily moved out of its engagement with the latch when the door is to be opened.

The device is intended to be used particularly upon the door of stoves or heaters used in railway cars or in similar situations. It is usual to provide stove or heater doors, under these circumstances, with means for locking them in closed position so that the contents of the fire boX will not be spilled out into the car in case of accident. The locking devices which have been used heretofore require manipulation by hand. That is, the latch is first closed and then the locking device moved to its locking position. Frequently the attendant forgets or neglects to lock the latch.

The primary object of my present invention is to provide a latch mechanism for the doors of stoves or other heaters which will be self looking so that when the door is closed its latch will be automatically locked.

The invention is illustrated, in a preferred embodiment, in the accompanying drawing in which- Figure 1 is a front elevation of the door of a stove or heater provided with the self locking latch of my invention, Fig. 2, a side view of these parts with the locking device or dog in operative position; Fig. 3, a similar view with the locking dog reversed to release the latch and the latch raised; and Fig. at, a view, in perspective, of the locking dog.

Like characters of reference designate like parts in the several figures of the drawing.

Referring to the drawing, 10 designates the door frame casting of a stove or heater, and 11 the door secured thereto by hinges 12. The latch bar 13 is pivoted to the door by a pivot pin 14;, the front casting 15 of the door having a slot 16 to give the latch bar play. The latch bar is en aged when in operative position, in a note 17 formed in a projecting lug 18 on the casting 10. The latch bar is provided, preferably, with the baokwardly extending projection 19 formed with a notch 20.

The locking dog 21 is loosely pivoted on a pivot pin 22 on the door frame casting 10. One end 28 of the dog is heavier than the other and has an angular nose 2 1 adapted to engage with the notch 20 of the latch. One side of the nose has the flat surface 25 which bears against the shoulder 26 formed by notch 20 (Fig. 2). The other side of the nose is curved so as to constitute a cam 27 which rests upon the top of the latch when the dog is reversed from its operative position. The other end of the pivot is formed with a preferably somewhat pointed projection 28.

The operation of the device is well illus trated by the drawing. Fig. 1 and the full lines of Fig. 2 represent the locking dog in its locking position. The dotted lines of Fig. 2 show the dog in the reversed position. The dog is reversed by striking a lug 28 with the finger turning the dog in the direction indicated by the arrow. This brings the cam 27 into contact with the top of the latch. The latch may then be raised, the cam or curved face sliding over the latch and the dog turning on its pivot as shown in Fig. 3. The dog falls back to its normal position when the door is opened. hen the door is closed the end of the latch projection 19 comes against the flat surface 25 of the dog and the dog is swung back. As soon as the latch bar enters the notch 17 the dog automatically falls into the locking position with its nose in engagement'with notch 20.

I claim:

1. The combination with a latch bar, of a reversible looking dog movable in a plane transverse to the plane of the latch bar which in one position locks the latch bar and in the other position engages the latch bar so as to be raised thereby.

2. The combination with a latch bar formed with a notch, of a pivoted reversible locking dog having a nose adapted to engage said notch and with a cam face which is in position to be engaged by the latch bar when the dog is turned over upon its pivot.

3. The combination with a latch bar having an angular projection formed with a notch, of a pivoted locking dog formed with a nose adapted to engage said notch and with a cam face which is in position to be engaged by the latch bar when the dog is turned over upon its pivot.

4:. The combination with a latch bar formed so as to provide a substantially vertical shoulder, of a. pivoted dog weighted at one end and said end formed with a fiat surface adapted to engage said shoulder and a curved cam surface adapted to engage the latch bar when the dog is turned on its pivot.

he combination with a latch bar, of a gravity dog pivoted to swing transversely to the plane of said bar, and a projecting member on the inner face of the latch bar which engages said dog and swings the same on its pivot, said dog and bar formed with coengaging locking means which operatively engage when the latch is in closed position.

6. The combination with a latch bar, of a pivoted gravity locking dog movable into locking position by the movement of the latch bar to its operative position and which can be turned on its pivot to a non-locking engagement with the latch bar while said latch bar is in operative position.

7. The combination with a latch bar of a dog adapted to have a locking engagement with said bar, said dog being supported above the bar with its lower end projecting into the path of the same and with capacity for movement in adirection transverse to the plane 01": said bar so that the dog is pushed out of the path of the bar by a closing movement of the latter.

8. The combination with a door and a latch bar, of a pivoted, reversible, gravity locking dog which, in one position, stands in the path of the latch bar when the door is open, is pushed out of its path by said bar as the door is closing and falls into locking engagement with said bar when the door is completely closed; said dog being provided with a cam face which, when the dog is in the reversed position, is engaged by the latch bar when the bar is raised so that the dog turns on its pivot with the raising of said bar.

EDlVARD A. SCI-IREIBER.

lVitnesSes G. Y. SKINNER, R. C. TIIORESON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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