Patent ID: 6357265
Filing Date: 2002-03-19
Classification: E05B,Y10S,Y10T

Abstract:
A theftproof lock structure comprising:a number lock body (10); an alarm (20) mounted in said number lock body (10) and including a circuit board (21), a buzzer (22), and a vibration switch (23); an elastic plate (40) secured in said number lock body (10); a rotary wheel set (30) pivotally mounted in said number lock body (10) and including a plurality of number wheels (32), a plurality of follower wheels (33), and a support shaft (31) extending through said number wheels (32) and said follower wheels (33), each of said follower wheels (33) rotated with said respective number wheel (32) and including an annular flange (331) having a flattened face (3310); a lock retaining plate (70) secured on said rotary wheel set (30) and having a locking recess (72); and an U-shaped padlock (60) secured on said number lock body (10) and including a joint end (61) having a neck (611) secured in said locking recess (72) of said lock retaining plate (70); whereby, when said flattened face (3310) of said annular flange (331) of each of said follower wheels (33) is disposed in a horizontal manner, said lock retaining plate (70) can be shifted so that said neck (611) of said joint end (61) of said padlock (60) can be detached from said locking recess (72), thereby releasing said padlock (60) from said number lock body (10); wherein, said support shaft (31), said follower wheels (33) and said elastic plate (40) are made of conducting material, said circuit board (21) of said alarm (20) has a positive pole and a negative pole respectively connected to said support shaft (31) and said elastic plate (40), one of said follower wheels (33) includes a boss (3311) formed on said annular flange (331) and located opposite to said flattened face (3310), said elastic plate (40) includes a tilt abutting piece (42) detachably abutting said boss (3311), when said number wheels (32) are rotated to a correct position, said flattened face (3310) of said annular flange (331) of each of said follower wheels (33) is disposed in a horizontal manner while said alarm (20) is closed, when said number wheels (32) are rotated to deviate from said correct position, said follower wheels (33) are rotated with said number wheels (32) to lock said padlock (60) while said boss (3311) of said annular flange (331) of said follower wheel (33) is moved to detach from said abutting piece (42) of said elastic plate (40), thereby starting said alarm (20), when a thief touches said number wheels (32), said vibration switch (23) of said alarm (20) is adapted to operate said buzzer (22) of said alarm (20) to emit sound, thereby achieving a theftproof function.