Patent ID: 9745774
Date: 2017-08-29
CPC Classifications: E05B,Y10T

Claim:
1. A lock cylinder comprising: a housing including a recess and an opening; a first sleeve rotatably mounted in said housing and comprising a plurality of recesses; a cylinder core accommodated in said sleeve and having spring-loaded tumblers engageable with said first sleeve, wherein engagement of said tumblers with said first sleeve resists rotation of said first sleeve in said housing; a coupling element mounted in said housing; a disengaging sleeve comprising a cam portion coupling said coupling element to said first sleeve; and a bearing rotatably fixed to said coupling element and supporting an output element and having an opening, wherein when a key is removed said spring-loaded tumblers engage said first sleeve forming a form closure, the disengaging sleeve forming a form closure between the cam portion and the opening in the bearing and between the cam portion and the recess in the housing and the opening in the housing to block rotation of the output element, the form closure shearing the cam portion on the opening in the housing and on the recess in the housing to increase a resistance moment that combats a torque generated by a forcible rotation of an improper object inserted in the cylinder core.