Patent ID: 8276413

Claim:
A pushbutton combination lock comprising: a frame ( 1 ); a lock bolt mechanism comprising: a lock bolt ( 17 ) movably mounted on the frame ( 1 ) between a locking and an unlocking position; and a lock bolt actuating mechanism ( 21 , 22 ) arranged to move the lock bolt ( 17 ) between the locking and unlocking positions and operable from a first and a second side of the lock; and a locking mechanism for locking the lock bolt mechanism to prevent the lock bolt ( 17 ) from being moved by the lock bolt actuating mechanism ( 21 , 22 ) to the unlocking position, which locking mechanism comprises: a first series of pushbuttons ( 25 ) on the first side of the lock and a second series of pushbuttons ( 25 ) on the second side of the lock; and a first series of tumbler members ( 33 ) movable between normal and depressed stable positions by means of respective pushbuttons ( 25 ) of said first pushbutton series, characterised in that the locking mechanism further comprises: a first check slide ( 39 ) movably mounted on the frame ( 1 ) between a first and a second position and co-operating with the first series of tumbler members ( 33 ) to be blocked, in its first position, or to be released thereby so as to be movable to its second position; a second series of tumbler members ( 33 ) movable between normal and depressed stable positions by means of respective pushbuttons ( 25 ) of said second pushbutton series; a second check slide ( 39 ) movably mounted on the frame ( 1 ) between a first and a second position and co-operating with the second series of tumbler members ( 33 ) to be blocked, in its first position, or to be released thereby so as to be movable to its second position; and a selector ( 59 ) which is movably mounted on the frame ( 1 ) and which is blocked or released by the first and second check slides ( 39 ), the selector ( 59 ) coupling the first and/or the second check slides ( 39 ) to the lock bolt mechanism ( 17 , 21 , 22 ) so that, at least when the first and the second check slides ( 39 ) are blocked, the selector ( 59 ) is blocked and is locking the lock bolt mechanism, and the selector ( 59 ) being arranged to be released by either the first or the second check slide ( 39 ) so that the lock bolt mechanism can be unlocked by releasing the first or respectively the second check slide ( 39 ).