Antipanic lock with a safety-drum

An anti-panic lock of the kind including a safety drum and for fitting on a door with an operating lever on one side of the door and the safety drum accessible on the other side of the door, said lock comprising housing means supporting a bolt for pivoting movement between a locked and an unlocked position for engagement and corresponding disengagement with a keeper, said operating lever adjacent one end being pivotally mounted on said housing means and engaging said bolt so that movement of said lever in one direction will effect movement of said bolt from said locked to said unlocked position, said housing means including a safety drum having a stator and a rotor inside said stator, a drive member carried by said rotor for engaging said bolt to move said bolt from said locked to said unlocked position upon rotation of said rotor, said housing means including first and second mounting means each for mounting a said safety drum in a selected orientation relative to said bolt and at least two operating means, one associated with said first mounting means and the other associated with said second mounting means and each for cooperating with a said safety drum when a said safety drum is mounted in a respective mounting means.