Patent ID: 6993946

Claim:
A lock comprising: an inside handle including an end; an inside spindle mounted to the end of the inside handle to turn therewith; an outside handle including an end; an outside spindle mounted to the end of the outside handle to turn therewith; a body mounted between the inside handle and the outside handle, the body comprising a case and a lid for covering the case, the case including a front end face and a lateral side, an opening being defined in the front end face of the case, a latch bolt being retractably extended through the opening; a first wheel pivotally mounted in the lateral side of the case, the first wheel including a through-hole into which the outside spindle extends, allowing joint rotation of the first wheel and the outside spindle, the first wheel being operably connected to the latch bolt such that turning of the first wheel causes retraction of the latch bolt, the first wheel further including a notch defined in a periphery thereof and communicated with the through-hole of the first wheel; a second wheel pivotally mounted in the lid and including a through-hole into which the inside spindle extends, allowing joint rotation of the second wheel and the inside spindle, the second wheel being operably connected to the latch bolt such that turning of the second wheel causes retraction of the latch bolt; a spring mounted in the end of the outside handle for biasing an end of the outside spindle into the through-hole of the first wheel, allowing joint rotation of the first wheel and the outside spindle; a lever including a first end and a second end, the lever swayably extending through the notch of the first wheel, with the first end of the lever being located outside the first wheel and with the second end of the lever being located in the through-hole of the first wheel; and a locking plug mounted in the case and movable between an unblocking position in which the latch bolt is retracted when either of the inside handle and the outside handle is turned and a blocking position in which the latch bolt is retracted when the inside handle is turned; wherein when the locking plug is in the blocking position, the locking plug presses against the first end of the lever and thus causes swaying movement of the lever, moving the second end of the lever to press against the end of the outside spindle to thereby move the outside spindle out of the through-hole of the first wheel such that the first wheel is not turned while the outside spindle is turned.