Patent ID: 7966852

Claim:
A two-stage lock cylinder structure, comprising: a lock casing, the lock casing is provided with a holding hole, and the lock casing is defined with a plurality of through holes that extend from the outer wall surface to the holding hole, locking pin sets are further fitted in the through holes, and each of the locking pin sets comprises a locking piece, a spring, an upper locking pin and a lower locking pin, with the length of each of the lower locking pins being different; a lock barrel, the lock barrel is installed in one end of the holding hole of the lock casing, a slot is defined in one end of the lock barrel, and the lock barrel is additionally provided with punched holes corresponding to the through holes of the lock casing, and the punched holes penetrate the outer wall surface of the lock barrel and extend into the slot, the punched holes also enable the locking pin sets to penetrate therethrough; the other end of the lock barrel is fitted with a first joining member, and additionally installed with an actuating unit, the actuating unit is installed in the other end of the holding hole, and is fixed to the lock casing using a fixing member, moreover, a second joining member is located at one end of the actuating unit to correspond with the first joining member, a flexible member is located between the first joining member and the second joining member, and the two ends of the flexible member are respectively fitted with a filling piece, pin connecting portions are located at another end of the actuating unit, and a fixed locking member is pin connected to the actuating unit using a pin connecting member, in addition, displacement distance of the first joining member towards the second joining member is smaller than the center distance of any two of the through holes of the lock casing.