Abstract: A key lock tumbler cylinder is selectively removed with an extraction key that is longer than a normal operating key. The last tumbler plate in a tabular cylinder series along the cylinder key slot projects into an arcuate channel in the cylinder cavity wall of the lock body. This arcuate channel does not junction with the lock tumbler plate channel but does intersect with a second channel in the cavity wall that is angularly displaced about the cylinder axis from the tumbler plate channel. However, the second channel is more shallow than the arcuate channel to confine the tumbler cylinder within the body cavity when rotated by the operating key which does not engage the last tumbler plate key aperture. A second, tumbler cylinder extraction key that is longer than the operating key includes an edge bit at the end of the key for cooperating with the last tumbler plate key aperture.

Abstract: A locking mechanism for locking menbers, such as slidable or swingable closures, to another, usually stationary, member in closed position in which a bracket on the stationary member is engageable by a hook on the closure member to latch the members together while actuation of the hook into a position of disengagement from the bracket to unlock the members from each other is accomplished by a key operated push lock mechanism.