US1144345A - Car-door lock. - Google Patents

Description

E. C. BROWN & W. B. MAY.

CAR DOOR LOCK.

APPLICATIUN FILED NOV. 28, 1914.

1,144,345. PatentedJune 29, 1915.

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CAR DOOR LOCK. APPL|CAT|0N FILED Nov. 28. 1914.

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EDGAR C. BROWN AND WILLIE B. MAY, OF WADESBORO, NORTH CAROLINA.

CAR-noon Loox.

specification of Letters raient.

Patented J une 29, 1915.

To all whom it may concern.'

Be it known that we, EDGAR C. BROWN and WILLIE B. MAY, citizens of` the United States, residing at Wadesboro, in the county of Anson and State of North Carolina, have invented new and useful Improvements in Car-Door Locks, of which the following is a specication. Y l The invention. relates to door locking mechanism, and more particularly to the class of sliding door locks for use on grain or box cars. 1

The primary object of the inventionis the provision of a door lock wherein the door of agrain or box car is secure when closed and can only'beunlocked for the opening thereof from beneath the body of the car and through-the use of a hand crank or key, thus obviating a surreptitious entry to the car through the doorway, the locking mechanism being of novel form and construction to assure the perfect working thereof.

AnotherV object of the invention is the provision of a door lock of'this character wherein it will automatically fasten the door on the closing thereof, thereby obviating repeated use of the hand crank or key when it is desired to fasten the door.

A further object of fthe inventionis the provision of a door lock of this character wherein its mechanism is mounted solely within the body of the car and is operated from beneath the same to allow the opening of the door for an entrance to the car.

A still further object of the invention is the provision of a car door lock of this character which is simple in construction, readily and easily installed within the bodyof the car, thoroughly reliable and efficient yin its operation, automatically operable for the locking of the door closed, and also which is inexpensive in manufacture.

With these and other objects in view, the invention consists in the construction, combination and arrangement of parts as will be hereinafter fully described, illustrated in the accompanying drawing, and pointed out in the claims hereunto appended.

1n the' drawing Figure 1 is a fragmentary side-levation of a box car with its door, the locking mechanism constructed in accordance with the invention being within and the door fastened closed. Fig. 2 is a` vertical transverse sectional view through the car. Flg. 1s a sectional view onl the line 3-3 of Fig. 1, showing the lock mechanism in top plan. p Fig. 4 is a vertical longitudinal sectionalview through the car.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring tothe drawings in detail, A designates generally a portion of the body of the car, which is of the grain or box type, and B the sliding door at the `side thereof for closing the doorway therein, as usual, the door lbeing supported through the medium of hangers 10 and tracks 11of any ordinary well-known construction for permitting movement thereof to opened or closed position. Mounted interiorly of the body A of the car is the door locking mechanism hereinafter fully described.` 1

The door locking mechanism comprises a sliding latch bolt 12 having the latch end thereof rounded, while its remaining portion is of squared formation in cross section, and is disposed transversely of the body A of the car to move horizontally, the rounded end of the said bolt being slidable through a guide plate 13 which is fixed on the inner face of the outer side wall of the body A, and this rounded end of the said bolt is of a length to project through the side of the body A so as to normally intersect the path of movement of the door B for the locking of the same closed. 1

Located at one side and slightly below the bolt 12 and lixed interiorly of the body A on the outer side wall thereof is a bracket 14; forming a `bearing for a vertically disposed operating shaft 15 which also passes through a bearing plate 16 xed to the flooring ofthe body of the car, the shaft being projected through the flooring into a recess 17 therein so as not to protrude beneath the bottom of the car, the end of the shaft l5 within the ,said recess 17 being squared as at 18 for the detachable connection thereof with a crank or key 19 which is used for the turning of the shaft to operate the lock mechanism hereinafter more full described. Fixed to the bottom of the body A of the car exteriorly thereof and surrounding the recess 17 therein is an escutcheon plate 20 lthrough which is introduced the crank or key 19 for its engagement with the shaft when the lock mechanism is to be operated for the unlocking of the door.

0n the shaft labove the bracket 14 is a disk 21 formed with the respective arms 22 and 27, the said arm 22 being formed with a bifurcation 23 in which is engaged a lug 24 fixed in and depending from the sliding latch bolt 12 so that on the turning of the diskv 21 the latch bolt 12 will be thrown in one'direction for retracting it to permit the opening of the door when the shaft is rotated. Swingingly connected to the bracket 14 is a trip vcam plate 25 carrying a trip cam 26, with the cam surface of which is adapted to engage the arm 27, which serves as a trip arm formed on the said disk 21, the plate 25 being connected with the bracket 14 through the medium of a hinge 28 to permit vertical swinging movement under the action of the trip arm 27 when the lock mechanism is operated.

Pivotally supported above the latch bolt 12 is a locking detent 29, the pivot 30 therefor being `disposed near one end, while mounted on the shorter end of the said detent 29 is a link 31 which is also connected to the swinging plate 25, and on the longer end of the detent 29 is carried a weight 32 which serves. to gravitate the said detent into locking engagement in a notch 33 formed in the bolt 12 so as to prevent the sliding thereof to released position after it has been thrown for locking the door B closed.

Connected with the bearing plate 13 is one end of a coiled retractile spring 34 which has its opposite end connected with the bolt `12 so that when it has been thrown to unlatching position by operating the shaft 15 and the door opened the said spring will serve to automatically throw the bolt 12' to locked position when the door is closed.

In the operationoof the locking mechanism, it will be assumed that the door B has been closed and the locking mechanism is in a position for fastening the door. Now, to open the door it is necessary to engage the key 19 with the squared end 18 of the shaft 15, and this is accomplished by going beneath the body A of the car, whereupon on the turning of the crank the shaft 15 is rotated, and simultaneously therewiththe disk 21 is turned so that the trip arm or extension 27 will travel onto the cam 26, depressing the plate 25, which causes the lifting of the detent 29 for disengaging it from the notch 33 in the bolt 12, and while the arm or extension 27 is traveling upon the cam 26 the forked arm 22 is moved so that its fork 23 will act upon the lug 24 to shift the bolt 12 to retracted position against the tension of the spring 34, and when the said bolt has been fully retracted the door is free to be opened. On swinging the door to opened position the bolt 12 will be held in its unlatched position so that on the closing of the door the same will be latchedautomatically under the action of the spring 34 acting upon the said bolt 12 without the use of the crank or key 22, thus it being seen that when the door is locked the detent 29 will engage in the notch 33 in the bolt so that it cannot be pushed inwardly from without the v car, thereby preventing a surreptitious entry to the same, as an entry can only be made when the crank or key 22 is used for the turning of the shaft 15 to operate the lock mechanism for the door.A l y It is` of course to be understood that in lieu of the use of a single latch bolt 12 any number of `the. same-may be employed and their operationl eifectedin. a manner as'hereinbefore set forth.

a From ythe foregoing description, taken in connection with the accompanying drawings, the-construction and manner of operationv of the device will beclearly understood,

and therefore a more extended explanation has been omitted.

What is claimed is 1.. The combination with a sliding door for a car, of locking mechanism` comprising a sliding bolt movable4 into the `path of movement of the door for fastening the same closed, a shaft mounted within the car and exposed at one end through the bottom thereof, a locking detent engageable with the bolt when fastening the door, and means actuated by the shaft for synchronously releasing` the detent and throwing the bolt.

2. The combination with a sliding door for a car, of locking mechanism comprising sameclosed", a shaftV mounted within the car l andexposed at one end through the bottom thereof, a locking detent engagea-ble with the bolt when fastening lthedoor, means actuatedby the shaft fori synchronouslyreleasing the detent and throwing the bolt,

means for automatically resettingthe bolt when` the door has been closed,`and 'means for gravitating the detent on the resetting of he bolt for-locking engagement therewit l 4. The combination, withl a sliding door for a car, of locking mechanism comprising a` sliding bolt movable `into the path of movement of the door for fastening the same closed, a shaft, mounted within the car and exposed at one end through the bottom thereof, a looking detent engageable with shaft from without the car Jfor operating 10 the bolt when fastening the door, means acsaid shaft.

tuated by the shaft for synchronously re- In testimony whereof we aiiix our signaleasing the detent and throwing the bolt, tures in presence of two witnesses.

means for automatically resetting the bolt EDGAR C. BROWN. when the door has been closed, means for WILLIE B. MAY. gravtating the detent on the resetting of Witnesses:

the bolt for locking engagement therewith, W. K. BoGGAN,

and means for detachably engaging the D. M. JOHNSON.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents, Washington, 1).'0.

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