Improvements in locking mechanism more particularly for railway wagon and other doors, but also applicable to other articles

摘要

199,175. Westcott, A. C. S., and Warner, D. March 29, 1922. Locks, preventing operation of; locks, squarekey; lock mechanism, slider type.-A wagon door lock in which a square key operates a pinion to actuate a racked balt, has a steel plate normally obstructing the square hole in the pinion, and moved aside by use. of a key of correct construction. The key comprises a central spindle a, the end of which is squared to engage a square hole t in the pinion b, and a sloove e freely rotatablo upon the spindle a. The end h of the sleeve e is cone-shaped, and has an interior screwthread corresponding to that on the part i of a bush having an enlarged part with circular recesses p engaging the teeth of a spring-controlled pinion q which also engages the rack r on the steel obstructing plate s. The spring q1 normally holds the bush i and the plate s in the position shown in Fig. 2, so that the hole w in the plate is not aligned with the hole t in the pinion b, preventing insertion of the key shank a to operate the bolt. On insertion of the key the end h of the sleeve e comes into contact with the screw-threaded part i of the bush. The sleeve is then turned either by means of the shaft a and clutch formed by the projection f on the collar g, or by independent means, causing the part i to enter the sleeve and until the sleeve end is in contact with the collar o of the casing n in which the bush slides guided by the pin l and slot l1 By this time, the conical end h of the sleeve has pushed aside the radially arranged members j, pressed inwards by the circular spring u, by engagement with their arms k, removing their bevelled arms v from the circular depressions p of the lower part of the bush as shown in Fig. 3. Further rotation of the sleeve then causes the lifting of the bush until the enlarged part is in contact with the lower surface of the collar o, as shown in Fig. 3. The upward travel of the bush 'causes the recesses p to rotate the pinion q against its spring q1, so moving the racked plate s to bring the hole w therein opposite the hole t, when the shank a can be thrust into engagement with the pinion b. Turning the pinion b by means of the kev shank a turns a wheel 2 rigid with a spindle 3 on which is fixed a wheel 4 meshing with the rack d on the bolt c, which is thereby moved into or out of its socket 11. In order to avoid accidental displacement of the parts by the jolting of the wagon, a catch 5 fixed to the plate is held by the spring q1 of the pinion q in engagement with the pinion 5. until the plate s is moved by the key. Geared toothed wheels may be added so that vertical and horizontal bolts may be operated simultaneously.