Security bar release mechanism

A lock mechanism for releasably locking a security bar over an opening through a wall and adjacent a first surface of the wall, the lock mechanism including:

• a housing for mounting in the wall adjacent the opening such that respective portions of the housing are exposed to the first surface and a second surface opposite the first surface;
• an engagement mechanism including
• a cable having a first end for connection to the security bar and a second end, and
• a receiver connected to the second end of the cable, the receiver having a lock surface;
• a roller in the housing;
• a plunger operable to move from a lock position to an unlock position, the plunger having a cam surface engaging the roller, the cam surface having first and second portions,
• the first portion of the cam surface engaging the roller when the plunger is in its lock position so that the roller engages the lock surface on the receiver and relative movement between the housing and receiver is restrained,
• the second portion of the cam surface engaging the roller when the roller is in its unlock position so that the roller does not engage the lock surface on the receiver and the receiver and cable are free to move relative to the housing;
• a bias member biasing the plunger to its lock position;
• whereby the security bar is locked over the opening in the wall when the plunger is in its lock position, and operation of the plunger to its unlock position unlocks the security bar from the opening in the wall.

A lock mechanism for releasably locking a security bar over an opening through a wall and adjacent a surface of the wall, the lock mechanism including:

• a housing mounted to the wall adjacent the opening;
• a latch in the housing movable from a first to a second position;
• a receiver having a lock surface engaging the latch when the latch is in its first position and not engaging the latch when the latch is in its second position;
• a receiver tube forming an elongated passage between the housing and the surface of the wall;
• and
• an engagement mechanism having a first end coupled to the security bar and a second end coupled to the receiver, the engagement mechanism extending through the receiver tube without restriction by the receiver tube so that the engagement mechanism is laterally movable within the receiver tube and the latch is operable between its first and second positions to selectively engage the receiver without regard to lateral movement of the security bar to the wall.