Combination lock mechanism

In a lock mechanism comprising an operating member which, in use, normally imposes a constraint on an associated device but can undergo releasing movement to discontinue the constraint and a plurality of settable members, each of which can be set by an operator in a selected one of a number of alternative positions, it being necessary for the operator to establish a releasing combination of respective positions of the settable members before releasing movement of the operating member can occur, and further comprising indicating means for indicating visually to a user the respective positions to which the settable members have been set, the improvement comprising means for obscuring the indicating means, said means for obscuring and the indicating means being arranged for relative movement whenever releasing movement of the operating member occurs, whereby the indicating means is obscured upon releasing movement of the operating member, said means for obscuring comprising a window through which the indicating means can be viewed whilst the settable members are being set and, when releasing movement of the operating member is effected, the window and indicating means undergo relative movement such as to obscure the indicating means.

A combination lock mechanism wherein there is associated with each settable member a respective driving element which is accessible to a user and the driving elements move with an operating member relative to the settable members when releasing movement of the operating member is effected.