Dual-ring tubular lock assembly

A dual-ring tubular lock assembly, comprising a key, a lock housing, inner-ring key pins, outer-ring key pins, a lock cylinder, inner-ring driver pins, outer-ring driver pins, springs, a lower bead seat, and a latch;

• the key being tubular in shape, an inner wall and an outer wall of the key being formed with inner-ring notches and outer-ring notches, respectively;
• the lock housing having a central through hole, a front end of the center through hole being formed with a stop step;
• the lock cylinder being movably inserted in the central through hole, a front end of the lock cylinder being formed with a tubular keyhole for insertion of the key, the front end of the lock cylinder being provided with a positioning structure cooperating with the key, the tubular keyhole being formed with inner-ring grooves and outer-ring grooves corresponding to the inner-ring notches and the outer-ring notches of the key respectively, the inner-ring key pins and the outer-ring key pins being mounted in the inner-ring grooves and the outer-ring grooves respectively, a rear end of the lock cylinder passing through a central perforation of the lower bead seat and extending out of the lock housing;
• the lower bead seat being fixed in the center through hole, the lower bead seat being formed with inner-ring holes and outer-ring holes corresponding to the inner-ring grooves and the outer-ring grooves respectively, the inner-ring driver pins and the outer-ring driver pins as well as the springs being mounted in the inner-ring holes and the outer-ring holes, respectively;
• the latch being fixed to the rear end of the lock cylinder.