GB1233425A - - Google Patents

Abstract

1,233,425. Combination locks. R. MARTELLINI. 31 July, 1968 [3 Aug., 1967], No. 36473/68. Heading E2A. A combination lock comprises an axially movable and rotatable shaft 10, a pinion 9 keyed to and slidable thereon and in engagement with teeth on a slidable bolt for withdrawal thereof, when the combination is set, by pulling outwardly a cap member 28, connected to the shaft by a pin 34, and rotating the cap member. The shaft 10 has a pin 22 engaging a stepped end portion of a non rotatable sleeve 20 which has four equally spaced teeth 20c each of which is engageable in a peripheral notch in each of four setting discs 52, mounted on parallel axes as a block 24, when the discs are set by rotating discs 42, in order to release the cap member 28 for axial movement thereby disengaging the discs 42 from the cap member and allowing rotation thereof to withdraw the bolt. Alternatively the bolt is withdrawn from the other side of the door by depressing a button 12 on the end of the shaft 10 to disengage the pin 34 from the cap member and by operating a knob secured to the bolt and sliding in a slot in a housing 3. The button 12 may be replaced by a knob which is rotated to withdraw the bolt. The shaft returns to its original position under the action of a spring 14. The setting discs are each maintained in position by a spring urged ball and are returned to original position either by rotating the discs 42 or automatically by projections 28F on the cap member which, when the cap member moves to its original position, rocks levers connected to the spring urged bells to release them from the setting discs which are returned to the zero position by springs 46. The combination is adjustable to different settings by selectively aligning one of a series of holes in the discs 52 with a hole in a second disc 54 and securing them by a pin passing through the aligned holes.