Pickproof lock

A pickproof lock comprising:

• a housing having
• a mounting chamber defined in the housing and formed through a front end of the housing and a rear end of the housing;
• a sidewall defined around the mounting chamber;
• and
• at least one through hole, and each of the at least one through hole formed through the sidewall of the housing;
• a lock shaft mounted in the mounting chamber of the housing and having
• a head portion;
• a mounting portion axially protruding from a rear end surface of the head portion;
• an outer recess axially formed in a front end surface of the head portion, wherein an inner bottom is defined in the outer recess;
• an inner recess axially formed in the inner bottom in the outer recess;
• multiple mounting holes separately arranged annularly along a peripheral side surface of the head portion, and each of the mounting holes axially formed through the front end surface of the head portion and the rear end surface of the head portion;
• at least one side hole, and each of the at least one side hole formed in the peripheral side surface of the head portion, radially extending in the head portion, communicating with the inner recess, and aligning with a corresponding one of the at least one through hole of the housing;
• at least one inner side surface, and each of the at least one inner side surface of the lock shaft defined around a corresponding one of the at least one side hole;
• and
• at least one stop flange, and each of the at least one stop flange formed on a corresponding one of the at least one inner side surface of the lock shaft;
• a sleeve mounted around the mounting portion of the lock shaft, disposed in the mounting chamber, securely connected with the housing, and having multiple blind holes, and the blind holes formed in a front end surface of the sleeve, separately arranged annularly, and respectively aligning with the mounting holes of the lock shaft;
• multiple axial pin sets respectively mounted in the mounting holes of the lock shaft and respectively mounted in the blind holes of the sleeve, and each of the axial pin sets including
• a first pin mounted in the mounting hole of the lock shaft;
• an axial resilient element mounted in the blind hole of the sleeve;
• and
• a second pin mounted in the blind hole of the sleeve, disposed between the first pin and the axial resilient element, pushed by the axial resilient element to protrude to the mounting hole of the lock shaft and abut against the first pin;
• and
• at least one radial pin set mounted in the at least one side hole of the lock shaft and the at least one through hole of the housing, and each of the at least one radial pin set including
• a key pin mounted in the side hole of the lock shaft and having
• a positioning end protruding to the inner recess of the lock shaft;
• an abutting end disposed opposite to the positioning end of the key pin;
• and
• an abutting flange formed around a side surface of the key pin, disposed between the positioning end and the abutting end of the key pin, and abutting the stop flange in the side hole of the lock shaft;
• a driver pin mounted in the side hole of the lock shaft and the through hole of the housing and abutting the abutting end of the key pin;
• a retaining panel mounted in the through hole of the housing and securely attached to the housing;
• and
• a radial resilient element mounted in the through hole of the housing, disposed between the driver pin and the retaining panel, and having two ends respectively abutting the driver pin and the retaining panel to push the driver pin to protrude to the side hole of the lock shaft.