Password lock

An improved password lock, comprising:

• a housing;
• a lock case;
• a password box;
• the lock case being rotatably fitted in one side of an accommodating cavity of the housing;
• the password box being installed in another side of the accommodating cavity of the housing;
• the password box being cooperatively linked with the lock case;
• an outer wall of the lock case having:
• an inner cam groove arranged along an axial direction of the lock case rotating in the housing,
• a radial groove arranged along a radial direction of the lock case rotating in the housing,
• a transverse groove arranged along the axial direction of the lock case rotating in the housing, and
• a raised block disposed between the radial groove and the transverse groove;
• the inner cam groove being composed of a plurality of transverse groove segments and a plurality of inclined groove segments;
• the password box including:
• a base,
• a cover,
• a holder,
• a slide block,
• a password shaft assembly,
• a plurality of bushings,
• a plurality of password wheel assemblies,
• a block ring,
• a plurality of password wheel positioning members,
• a plurality of buckles,
• a return elastic plate,
• a lifting rod,
• a password shaft spring, and
• a password change spring;
• the cover being fixed to a top surface of the base;
• the plurality of bushings being rotatably inserted through middle holes of the plurality of password wheel assemblies respectively;
• two ends of the password shaft assembly movably passing through two ends of the holder respectively;
• the plurality of password wheel assemblies with the plurality of bushings being confined in the holder;
• the slide block being movably sleeved on one end of the two ends of the password shaft assembly and located outside the holder close to the lock case;
• the block ring being movably sleeved on another end of the two ends of the password shaft assembly and located outside the holder;
• the plurality of password wheel positioning members and the plurality of buckles being connected at intervals, the plurality of password wheel positioning members and the plurality of buckles being installed under the plurality of password wheel assemblies;
• an inner end of each of the plurality of password wheel positioning members abutting against external teeth of a corresponding one of the plurality of password wheel assemblies to restrict rotation of the corresponding one of the plurality of password wheel assemblies;
• the return elastic plate being disposed between the inner end of each of the plurality of password wheel positioning members and the base,
• an outer end of each of the plurality of password wheel positioning members being movably in contact with the lifting rod, the lifting rod being disposed under the password shaft assembly, one end of the lifting rod being inserted in the inner cam groove of the lock case by a clearance fit and being moved up and down along with rotation of the lock case;
• the password shaft spring being disposed between the password shaft assembly and the block ring, the password change spring being sleeved on the block ring;
• and
• two ends of the password change spring being pressed against the holder and the block ring, respectively.