Lock Mechanism

A security lock comprises a slide with a bolt section along a side thereof and integral therewith, and a casing having a channel with an open side for receiving and retaining the bolt section. The bolt section and channel have substantially the same cross-section to allow for sliding engagement of the bolt section in the channel to a hold position. The bolt section has a recess with at least one defined axial boundary on its surface, aligned when the bolt is in the hold position with an opening in the wall of the channel. A cam and follower mechanism is mounted in the lock in which the cam is rotatable in the casing to at least one hold orientation at which the follower extends in the opening and into the recess when the bolt section is in the hold position to restrict movement of the bolt section along the channel. A key device can rotate the cam between at least one hold orientation and at least one other release orientation at which the follower can withdraw from the recess and release the bolt section in the channel.