Patent ID: 6209368
Filing Date: 2001-04-03
Classification: E05B,Y10S,Y10T

Abstract:
A combination lock comprising:a male lock body (1) including a rod (11) with a plurality of longitudinally spaced teeth (12) formed thereon; anda female lock body (2) including:a column (21) having a longitudinal slit (212) for releasably receiving the rod (11) of the male lock body (1), the column (21) including a plurality of pairs of protrusions (215) on two lateral sides thereof,a plurality of sleeves (23) mounted around the column (21), each said sleeve (23) including a central hole (231) with a notched section (2311) through which the rod (11) of the male lock body (1) extends, a periphery defining the central hole (231) of each said sleeve (23) including a pair of grooves (235) for releasably engaging with one of the pairs of protrusions (215) of the column (21),a plurality of retainer plates (24) mounted around the column (21), each said retainer plate (24) including a central hole (241) with a notched section (2411) through which the rod (11) of the male lock body (1) extends, a periphery defining the central hole (241) of each said retainer plate (24) including a pair of grooves (243) for releasably engaging with one of the pairs of protrusions (215) of the column (21),a plurality of number wheels (25) mounted around the column (21), each said retainer plate (24) being releasably engaged with an associated said number wheel (25) to rotate therewith,an elastic element (22) mounted around an end of the column (21) for biasing each said retainer plate (24) to engage with the associated number wheel (25) to rotate therewith; andmeans for actuating each said retainer plate (24) to disengage from the associated number wheel (25) for allowing a change in unlocking code for the combination lock, the actuating means being operable only when the combination lock is in an unlocked status in which the grooves (243) of each said retainer plate (24) align with the protrusions (215) of the column (21).