Patent ID: 7216518

Claim:
A disk type mechanical combination lock comprising a plurality of annular code discs, a base disc, a latch, an unlatching mechanism, a positioning mechanism, a casing and an outer dial, characterized in that it further comprises: a dialing mechanism comprising: a frame comprising a cylinder in which a groove is defined for accommodating a dialing block and a protrusive tongue at an end of said cylinder, said frame being connected by a coupling spindle to said outer dial; said dialing block being sheet-shaped and disposed in said groove of said frame, an end of said dialing block being movable in and out of a sleeve; and a controller comprising: said sleeve, a pawl, and a controlling disc, said sleeve being rotatably fitted over said cylinder of said frame and having at least one circumferential slot on a surface thereof in which said end of said dialing block is movable, and at least one ratchet disposed on an end surface of said sleeve, said controlling disc having at one end of said frame a projecting edge at an outer edge of said controlling disc, said pawl being fixed on said base disc by a rotating shaft, a front end of said pawl being in contact with said outer edge of said controlling disc and with said at least one ratchet on an end surface of said sleeve, a repositioning mechanism comprising a repositioning ring and a bracket, said repositioning ring comprising a generally annular sheet rotatable about said spindle by said bracket, and a code-detecting mechanism comprising a controlling piece, a limit boss, and a staff, said controlling piece being fixed on said base disc through said staff with a front end of said controlling piece being in contact with said outer edge of said annular code discs.