Lockset

A lockset comprising:

• a lock cylinder comprising a key hole and a first lock slot, the key hole extending along an axial direction of the lock cylinder, the first slot extending along a radial direction of the lock cylinder and communicating with the key hole;
• a lock casing sleeved on the lock cylinder, the lock casing comprising a second lock slot, the second lock slot extending along a radial direction of the lock casing and corresponding to the first lock slot;
• a first lock member accommodated in the first lock slot;
• a second lock member accommodated in the second lock slot;
• and
• an anti-theft member sandwiched in between the first lock member and the second lock member;
• wherein the key hole is configured to receive a first key and a second key, a cross-sectional shape of the first key is different from a cross-sectional shape of the second key, the cross-sectional shapes of the first and second keys are obtained by cutting a non-bitted region of the first and second keys inside the cylinder;
• wherein, when two ends of the anti-theft member are respectively located in the first lock slot and the second lock slot, the lock cylinder and the lock casing are locked;
• wherein, when the first key is inserted into the key hole, a first contact point is formed between the first key and the first lock member, and a contact surface between the anti-theft member and the first lock member is aligned with a rotation interface between the lock cylinder and the lock casing, such that the lock cylinder and the lock casing are unlocked;
• wherein, when the second key is inserted into the key hole, a second contact point is formed between the second key and the first lock member, and a contact surface between the anti-theft member and the second lock member is aligned with the rotation interface between the lock cylinder and the lock casing, such that the lock cylinder and the lock casing are unlocked;
• wherein a distance between the first contact point and the second contact point is equal to a thickness of the anti-theft member.