US1050922A - Lock for sliding doors. - Google Patents

Description

J. DAVIS.

LOOK FOR SLIDING nouns.

' APPLICATION FILED MAR. 7, 1912.

Patented Jan. 21, 1918.

WHHI

v fizz/677127".

I Jse ibfladia c. Qr M pin FETQ

JOSEPH DAVIS, OF CHICAGO, ILLINOIS.

LOOK FOR- SLIDING DOORS.

Specification of Letters Patent.

Patented Jan. 21,1913.

App1ication filed March 7, 1912. Serial No. 682,135.

To all whom it may concern Be it known that I, JOSEPH DAVIS, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Locks for Sliding Doors; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to looks for sliding doors, and it includes improved features of construction, some of which are applicable especially to looks for sliding doors of freight cars, and others of which are adapted for use in connection with locks for sliding doors of other kinds.

The invention consists of the matters hereinafter described and pointed out in the appended claims.

In the accompanying drawingsFigure 1 is a view in front elevation of a lock embodying my invention with parts in section, showing the parts in locked position; Fig. 2 is an end view of the same; Fig. 8 is a plan view of the lock; Fig. 4 is a front elevation of the lock, showing the look latch at the moment of its release from its elevated position in which it is set for unlocking.

As shown in said drawings, A indicates the forward part of a sliding car door and B, a part of the car wall, forming the jamb of the door toward which the forward edge of the door is moved in closing the same. As shown, the outer face of the door is substantially flush with the part B of the car wall.

A indicates a handle on the door to be grasped in moving or sliding the same.

C indicates a horizontally arranged, vertically swinging locking latch which is pivoted at one end to the car door A, by a pivot bolt 0, located at some distance from the forward edge of the door. Said pivot bolt is so located that the free end of the locking latch projects beyond the said forward edge of the door, and is adapted to. swing in a vertical plane. On the swinging end of the locking latch is formed a laterally and downwardly extending plate or looking lug C, giving to the swinging end of the looking latch, in effect, the form of a hook. A guide-plate D is attached to the door near its front edge, said guide-plate being provided with a guide-slot, arranged in a vertical plane, and through which the locking latch extends, the said slot being long enough to permit the necessary degree of vertical or swinging movement in the for ward end of the locking latch.

A keeper or staple member is attached to the wall B, the same consisting of a baseplate E and a horizontally arranged loop member or staple E which extends forwardly or outwardly from the base-plate and is adapted to receive the lug C, which latter is adapted for insertion through said staple by the downward swinging move ment of the locking latch when the door is fully closed, and to be disengaged from the staple member by the lifting of said locking latch. The part or arm 6 of the staple located nearest the door or at the inner side of said staple, is provided with an oblique guide-plate or flange E which is inclined downwardly and laterally therefrom, and is adapted to effect the lifting of the locking latch when the lower end of the lug C thereofstrikes the said guide-plate, in the closing movement of the door. As shown, the said guide-plate E is secured at its inner edge to, or formed integral with the base-plate E and projects outwardly or forwardly from the latter. The staple member is provided, at the opposite or outer side of the staple E, with a vertically arranged plate E which extends above and below the staple, and is made integral with the base-member E of said staple. Said plate E is so arranged that the lug C of the locking latch will be adjacent to and substantially parallel therewith, when said lug C is resting within or is in locking engagement with said staple. The lug C is provided in its lower part with a hole 0 and the plate E is provided with a like hole 6 The holes 0 and c are so arranged that they will be in line, or register with, each other, when the lug C is fully inserted within the staple. This construction enables the lock to be easily sealed; as for instance, by a sealing strip F, inserted through the holes 0 and e, so that the locking latch cannot be lifted to disengage it from the staple, without breaking said sealing strip.

G is a swinging dog or detent, having the form of a bell-crank lever, which is mounted on a pivot 9 located below the locking latch and near the forward edge of the door. The upwardly extending arm G of said detent G constitutes a detent arm when in one position to engage and hold in its elevated position, the locking latch C, and when shifted from such position to be released from the locking latch, so that the latter will fall to its position for engagement with the staple. The upper end of said detent arm G enters a recess formed in a casing or housing C on the front face of the latch C; said recess extending longitudinally of the latch and opening downwardly. The said recess is made much deeper in its forward than in its rear part, so as to form a deep forward pocket a and a shallower rear pocket 0 The pocket 0 is deep enough to receive the upper end of the arm G of the detent- G, when the said arm G is swung forwardly or toward the edge of the door and the locking latch is in its depressed or locking position, as seen in Fig. 1. The rear or shallow pocket 0 is formed to provide a downwardly facing abutment or shoulder 0 adapted for contact with the upper end of said arm G when the latter is swung rearwardly, in a manner to hold the locking latch in its elevated position, as seen in dotted lines in Fig. 1. The shoulder c is recessed or made concave so that the end of the arm G cannot be moved or swung forwardly from said shoulder a without slightly lifting the latch.

- The arm G of the detent G extends horizontally from the pivot 9 towardthe forward edge of the door, and is provided at its end with an upwardly extending cam tooth or V-shaped projection 9 Said tooth g is so arranged as to strike or come in contact with the lower horizontal edge of a tripping member E formed on the staple member, when the dog is moved horizontally in opening the door. As shown, the tripping member E forms a downward extension of the guide-plate E but it may have the form of a separate projection on the staple member. The tooth g is so arranged and located that, when the door is fully closed and the locking latch in. its locked position, said tooth will stand outside of and extend above the lower edge of the tripping member E as shown by dotted lines in Fig. 1, so that, in the opening movement of the door, the lower edge of the tripping member will act on the tooth to depress the horizontal arm G of the dog and swing the upper end of the upright arm G away from the shoulder 0 If, therefore, when the door is closed, the locking latch be lifted and the arm G of the dog be placed beneath the shoulder a to hold said latch in its lifted position, or set the same for unlocking, as the door is moved to open the same, the contact of the tooth g with the tripping member will have the effect of.

swinging the dog so as to release the arm G from the shoulder a", whereupon the latch, being no longer supported in its elevated position, will descend; but will not become locked, because the movement of the door will have carried the lug C inwardly away from the opening of the staple, and the said lug may strike and slide away from the guide-plate E or, if the door is opened quickly enough, will fall free of said guideplate. The upper end of the arm G, as the locking latch falls, enters the pocket 0 of the recess in the locking latch, and the looking latch will then be left in readiness to again engage the staple member when the door is next closed.

The locking latch C is shown as provided with a forwardly projecting lug H forming a finger piece or hand-hold, by which it may be easily lifted.

In the operation of the locking device, when the door is closed and locked, and it is desired to open the same, the locking latch is first lifted, and the dog swung or moved by the hand so as to bring its arm G beneath the shoulder 0 when said latch will be set in its unlocked position, or with its hooked end or flange C above and free from the staple E. The door may be then opened, and as it is slid backwardly, the action of the lower edge of the guide-plate on the tooth of the arm G will swing the dog in a direction to release the locking latch, so that when the door is again closed, said latch will be free to become interlocked with the staple member, in the usual manner. In my improved lock, therefore, the locking latch comes automatically into looking engagement with the staple when the door is cl-osed, the locking latch may be set in its unlocked position before the door is opened, and said latch will be released by the act of opening the door, so as to be in readiness for automatic locking when the door is again closed.

An important advantage is ained by the use of the device described in connection with locks for freight car doors. Such doors are usually high above the ground and require considerable force to move them, and it is necessary that both hands should be used in opening the same. If one hand were used to lift the locking latch and the other to slide the door, the opening of the door would be diflicult and troublesome, but by the use of the device described, the looking latch may be set in its unlocked position before any attempt is made to open the door, and both hands may be thus used in sliding back the same. As the locking latch is antomatically released in the act of opening the door, no attention need be given to the lock at the time of closing the door.

I have shown in the accompanying drawings one practical form of lock or looking device embodying the several features of my invention, but as the details of the same may be variously modified in practice, I do not desire to be limited to the exact features of construction illustrated and described, except so far as specified in the appended claims.

I claim as my invent-ion:

1. A sliding door lock, comprising a pivoted, vertically swinging locking latch, provided at its swinging end with a locking lug, a staple member provided with an aperture adapted to receive said locking lug, an inclined guide plate for said locking latch acting to lift said latch in the movement of the same toward the staple member, means adapted to engage the locking latch for temporarily holding the same free from engagement with the aperture, and a tripping member adapted to act on said means to trip the same and release the locking latch in the opening movement of the door.

2. A sliding door lock, comprising a pivoted locking latch provided on its swinging end with a locking lug, a pivoted detent, provided with a detent arm adapted to engage the locking latch to hold the latter in its disengaged position, and with an actuating arm provided wit-h a cam projection; and a staple member provided with a staple adapted to receive said locking lug, and with a tripping member, adapted to act on the said cam projection to trip the detent and release the locking latch in the opening movement of the door.

3. A sliding door lock comprising a pivoted locking latch provided on its swinging end with a locking lug, an oscillating detent lever, provided with an upwardly extending detent arm and with a horizontal arm having an upwardly-extending camprojection, said locking latch being provided with a shoulder for engagement with the said detent arm, and a staple member provided with a staple adapted to receive said locking lug, and with a fixed tripping member adapted to act on said cam projection to trip the detent and release the locking latch in the opening movement of the door.

4. A sliding door lock, comprising a pivoted locking latch provided on its swinging end with a locking lug, an oscillating detent lever provided with an upwardly extending detent arm, and with a horizontal cam arm provided with an upwardly extending cam' projection, said locking latch being provided with a downwardly opening, horizontal recess adapted to receive the upper end of the detent arm, and in said recess with a downwardly facing shoulder for engagement with said detent arm, and a staple member provided with a staple adapted to receive the said locking lug, and with a tripping member adapted to act on the said cam projection.

5. A sliding door lock, comprising a pivoted locking latch provided on its swinging end with a locking lug, an oscillating detent lever provided with an upwardly extending detent arm, and with a horizontal cam arm provided with a cam projection, said locking arm being provided with a detent shoulder for engagement with said detent arm in one position of the detent lever, and a staple member provided with a staple adapted to receive said locking lug, and with an inclined guide-plate for the locking latch, the lower edge of which is located in position to act on thesaid cam projection in the opening movement of the door.

In testimony, that I claim the foregoing as my invention I afiix my signature in the presence of two witnesses, this 2nd day of March A. D. 1912.

JOSEPH DAVIS.

Witnesses:

GEORGE R. WILKINS, T. H. ALFREDs.

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

Images