US Patent 7100409 Burglarproof lock core structure

The present invention provides a burglarproof lock core structure which forms a curved passage between a key slot of a plug and a lower pin chamber, such that at least a bending concave surface offsetting the center of the key slot is formed at one side, and cone apexes of a plurality of lower pins are extended out of the lower pin chamber and aligned in the wall edge of the key slot. Moreover, a control valve with a cone apex is located at the other end corresponding to the bending surface inside the key slot, such that a key with curvature corresponding to the passage and notches corresponding to the cone apexes is required to open the lock, thereby having the effect of high security of burglarproof.