Combination lock

Abstract

A combination lock comprising at least two coaxially arranged elongate members, first and second rotatable combination dial members for each elongate member, an abutment member on each elongate member, a bolt which is adapted to slide backwards and forwards in the direction of alignment of the elongate members, and a bolt-operating member, each first combination dial member being fixed to its elongate member and each second combination dial member being rotatable with respect to its elongate member, and each second combination dial member having a central aperture for receiving the elongate member and a slot for receiving the abutment member, the combination lock being such that when the code set on all the second rotatable combination dial members agrees with the code set on all the first rotatable combination dial members each abutment member can move into the slot on its second combination dial member to allow each elongate member to move through its second member for allowing withdrawal of the bolt, and the combination lock including locking means which is spring biased into engagement with the first rotatable combination dial members and which prevents unintended rotational movement of the first rotatable dial members and therefore unintended loss of the code set on the first combination dial members while permitting backwards and forwards movement of the first combination dial members when the elongate members are moved backwards and forwards through the second combination dial members.

Dependencies are inferred from the claim text.