Improvements in or relating to tumbler locks
177,692. Reichard, C. March 15, 1921. Lock-mechanism, slider-type.- In a sliding tumbler lock, a non-rotating key has wave-faces for depressing the projections of the tumblers clear of the gates in the bolt, while a wedgeshaped side piece of the key protrudes or retracts the bolt as the key is inserted. The tumblers are arranged one behind the other in a recess in the bolt and projections b are pressed into gates g in the bolt by springs k. The gates g have a number of side notches for locking the bolt in various positions of protusion. The key c has a series of strips, one corresponding to each tumbler, the strips having wave-like surfaces e, e<1> for depressing the tumbler projection out of the side notches of the gates g. As the key is pushed into the key-slot f, the tumblers are intermittently released from engagement with the bolt at the points n where the crests of the wave faces e and e<1> cross, and the side-piece d pushes out the bolt. The piece d has successive edges inclined and parallel to the direction of insertion of the key in order to push out or retract the bolt step by step, as the tumblers are intermittently released and allowed to re-engage by the wave faces e, e'. The bolt is retracted by inserting the key with the side-piece d on the side opposite to that used for protrusion of the bolt. In the form shown in Fig. 3. the side-bit d of the key moves an auxiliary bolt i which move the the main bolt a by means of the lever h. By this means, the same amount of travel of the bolt is secured by a smaller sidepiece d.