When the lock needs to be closed, push the wrench on the lock ring by hand, and the lock ring will overcome the pull of the large tension spring and extend along the track of the lock shell to the outside of the lock body to enter the other mouth. At this time, the lock is at the tail slot of the lock ring. The lock moves downward along the guide slot under the action of the small tension spring and enters the tail slot of the lock beam. The lock ring is locked by the lock. When the lock moves downward, the lock also drives the eccentric shaft of the lock core to rotate, making the lock core turn back to its original position, and the key can be removed.

The anti-theft lock is composed of a lock head, an inner lock seat, and an insertion rod. The lock head and the inner lock seat are fixed on both sides of the horizontal bar of the bicycle rear wheel frame with screws and connecting devices. The insertion rod passes through the rear wheel, the inner lock seat, and is fixed on the lock head. The inner lock seat is provided with a through hole with a necking in the middle perpendicular to the insertion rod. On both sides of the necking, one end of the necking is inserted with a locking pin that can be embedded between the flywheel teeth and is sleeved with a spring. The locking pin passes through the necking and is hinged with the pull pin rod, The locking pin is provided with a notch that can be clamped with the insertion rod. When in use, one end of the lock pin is pushed between the flywheel teeth by the spring, and then the insertion rod is inserted into the lock head to lock, so the flywheel and the wheel cannot rotate.