Patent ID: 7100409

Claim:
A burglarproof lock core structure comprising: a) a shell having upper pin chambers; b) a plug inserted into the shell and having: i) lower pin chambers communicating with the upper pin chambers; ii) a key slot located on an end thereof; iii) a passage curved between its upper and lower portions along a longitudinal plane and located on an interior thereof and communicating with the key slot and the lower pin chambers; and iv) a control valve located in the curved passage opposite the lower pin chambers and having an apex; c) a plurality of lower pins located in the lower pin chamber, the plurality of lower pins have lower pin apexes extending into the curved passage a predetermined distance; d) a plurality of springs located in the upper pin chambers; e) a plurality of upper pins located between the plurality of lower pins and the plurality of springs, the plurality of upper pins being movable between locked and unlocked positions; and f) an opening key having a curved portion matching the curved passage and being removably inserted therein and a plurality of notches located on the curved portion and selectively aligning with the plurality of lower apexes and the apex of the control valve, wherein when the opening key is inserted into the curved passage the plurality of notches positioning the plurality of lower pins in predetermined positions and moving the plurality of upper pins to the unlocked position allowing the plug to be rotated in the shell, and when the opening key is removed from the curved passage the plurality of springs press the plurality of upper pins to the locked position preventing the plug from being rotated in the shell, wherein the lower pin apexes form a curved line along a longitudinal plane when the opening key is removed from the curved passage.