Patent ID: 6708534
Filing Date: 2004-03-23
Classification: E05B,Y10T

Abstract:
A padlock comprising:a shackle having a long leg, a short leg, and two bolt recesses disposed at said long leg and said short leg respectively; a housing having two shackle holes at the upper portion to allow said shackle passing therethrough; a lock body having a first sidewall, a second sidewall, and a first shackle groove for receiving said long leg of said lock shackle, and a second shackle groove for receiving said short leg of said lock shackle; a lock bolt mechanism disposed in said lock body, including a spring and two blocks connected to the two ends of said spring; a lock cylinder assembly disposed at the middle portion in said lock body, comprising a cylinder housing, a lock cylinder disposed through said cylinder housing, a key receiving recess extended axially and inwardly for receiving a first key, and a drive pin connected to the portion of said lock cylinder out of said cylinder housing; and a combination lock assembly comprising a fork mechanism having a fork lever and a plurality of plates parallel to said fork lever, connected with said second sidewall by a fastening spring; a wheel mechanism comprising a plurality of numeral wheels, each numeral wheel being disposed between two adjacent plates; a clutch mechanism disposed within said wheel mechanism, including a clutch shaft and a plurality of rotatable clutch sleeves disposed on said clutch shaft, each clutch sleeve including a disc perpendicular to said clutch shaft, said disc having a plane at its rim in matching with said plate, wherein when the padlock is locked, said two blocks of said lock bolt mechanism are engaged with said bolt recesses of said shackle and said fork lever is positioned between said two blocks, wherein when said first key inserted into said first key receiving recess is turned, said drive pin drives said fork lever to move outwards so that said two blocks move to the center of said spring by pressing said shackle downwards to unlock the padlock, wherein when said numeral wheels are turned to a predetermined sequence, all said planes of said discs are positioned at the same plane and contact said plates of said fork mechanism, said fork lever moves outwards by the action of said fastening spring so that said two blocks can move to the center of said spring by pressing said shackle downwards to unlock the padlock.