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Key cylinder for electronic locking device

  • US 9,273,493 B2
  • Filed: 09/23/2013
  • Issued: 03/01/2016
  • Est. Priority Date: 09/27/2012
  • Status: Active Grant
First Claim
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1. A key cylinder for an electronic locking device including a cylinder housing, and a cylinder plug positioned in an axis direction in the cylinder housing, rotatably installed in place and locking and releasing the cylinder housing, wherein the cylinder plug includes a lock head including a key insertion hole into which a key head of an electronic key is removably inserted to a front side, a printed circuit board exchanging power and authentication data from the electronic key by installing a plurality of key connection pins in a connection housing installed through the lock head, accessing to the plurality of key connection pins and equipping with a microprocessor and EEPROM, a driving motor performing normal rotation and reverse rotation drive in accordance with an input signal of the printed circuit board, a spur gear installed in the axis direction of the driving motor, a lock pin guider fixed in a rear direction of the cylinder plug, a direction conversion rotary ring rotating in accordance with drive of the driving motor by an internal gear rotatably installed through a fixing axis in the center of the lock pin guider and engaged with the spur gear in a front direction and a spiral groove formed in a rear direction, and a lock pin installed in the lock pin guider such that a pin hole formed in a direction perpendicular to the axis direction of the cylinder plug fluctuates, inserted into one side of the spiral groove formed in the direction conversion rotary ring, positioned through a straight guide wall intercommunicating with the pin hole, and appearing and disappearing in lock holes formed in the cylinder housing by moving in a perpendicular direction to axis rotation of the direction conversion rotary ring through installation of a foot pin performing straight line motion to realized locking and release of the key cylinder.

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