Patent ID: 6079239
Filing Date: 2000-06-27
Classification: E05B,Y10T

Abstract:
A tamperproof lock, comprising:a cylindrical lock body, said lock body having a key hole accessible from a front end of said lock body, a swivel slot in a rear portion thereof and in communication with the key hole, and having a round slot disposed adjacent to the key hole, the round slot being in communication with the swivel slot, said lock body further having at least one locating hole disposed in a side thereof and in communication with the round slot;a first lock core disposed within the key hole, and being releasably engagable with said lock body;a second lock core disposed within the round slot, and having at least one lock piece that is disposed in registration with the at least one locating hole;a housing covering said lock body, and having at least one locating slot formed in a side thereof and in registration with the at least one locating hole, said lock piece being positionable to project through the locating hole and into the locating slot to fix said lock body relative to said housing, and being movable to a further position in which said lock piece is moved out of engagement with the locating slot so that said lock body is free to rotate relative to said housing; anda key, whereby when the key is inserted into the key hole from the front end of said lock body and in a first direction, the key releases said first lock core from said lock body, so that when the key is rotated, said key and said first lock core rotate together as a unit, and whereby after said key is rotated, said key is movable in a second direction opposite to the first direction, so that said key engages with said second lock core to move said lock piece to the further position in which said lock piece is moved out of engagement with the locating slot so that said lock body is free to rotate relative to said housing.