Patent ID: 7171833

Claim:
A cylinder lock comprising: a tubular housing being hollow and having a flanged end and a key hole defined in the flanged end; a fixed hollow cylinder securely held inside the housing and having an end surface; a center hole; a spring-loaded retaining element disposed in the fixed hollow cylinder; multiple bores formed in the end surface; and multiple tumbler pins and tumbler springs mounted in the bores respectively; a rotatable hollow cylinder being coaxially mounted with the fixed hollow cylinder in the housing and having a center; a non-circular mounting hole formed in the center; and multiple holes formed longitudinally through the rotatable hollow cylinder, each of the holes having a bolt corresponding to and pushed by one of the tumbler pins; a locking bar extending through the center hole in the fixed hollow cylinder, the mounting hole in the rotatable hollow cylinder and the key hole in the housing and having a latching end corresponding to and mounted slidably in the center hole of the fixed hollow cylinder; an actuated end; a mounting portion formed near the actuated end, extending slidably through the mounting hole in the rotatable hollow cylinder and having a surface; two planes oppositely formed on the surface; two shoulders defined respectively on the planes and selectively abutting with the retaining element; a resilient element mounted around the mounting portion and retained by the locking bar.