US 5,485,734 AGranted

Combination lock

OwnerKuo-Tsung Yanginventor

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Abstract

A combination lock integrates the key lock performance into a combination lock, so that it can be unlocked by a supplement key when the combination number has been forgotten. The combination lock includes a base and cover assembly equipped with at least one numerical wheel, a sliding block slidably received within the base and cover assembly, a control means which has an engaging element being operably received on the sliding block, and sliding plate slidably received between the base and the sliding block. The sliding plate has at least one ear to control a sliding movement of the sliding plate and cooperate with the at least one numerical wheel, and a guide portion cooperating with the engaging element. The guide portion has two ends, the sliding plate being confined to move with the sliding block when the engaging element is in the first end and the sliding block being freely slidable relative to the sliding plate when the engaging element is in the second end.

Claims6

Dependent claims

A combination lock comprising:

a base equipped with at least one numerical wheel;
a cover engageable with the base;
a driving element operably mounted on the cover;
a sliding block slidably received within the base and cover and actuated by the driving element;
a control means being operably received on the sliding block and operable by a key to rotate a downwardly extending engaging element thereof to switch the combination lock between a key-openable mode and an a numerical-wheel-openable mode;
and
a sliding plate slidably received between the base and the sliding block, the sliding plate having:
at least one ear to cooperate with the at least one numerical wheel and thereby selectively enabling a sliding movement of the sliding plate, and
a guide portion adapted to cooperate with the engaging element and arranged such that the sliding block is confined to move with the sliding plate when the engaging element is in a first end of the guide portion and the sliding block is freely slidable relative to the sliding plate when the engaging element is in a second end of the guide portion.

6 more elements

Dependencies are inferred from the claim text.