Abstract: An optical key reader for door locks is disclosed including optical scanning means for detecting a code pattern on a key unit when the unit is randomly oriented in an area near a given surface; the detected code being then compared by comparator means with a predetermined code which is stored in the reader. If a match is found in this comparison, the comparator means generates an actuation signal which is coupled to an electrically-actuatable securing means to cause the securing means to allow access through a door.

Abstract: A fire-safe lever handle is for use with a lock having a bolt retractable by rotation of a spindle about an axis. The lever handle has a center of gravity off of said axis and has a hub surrounding the spindle. Disposed between the hub and the spindle is a body of meltable or fusible material, such as lead. Under ordinary temperatures the fusible material is solid and connects the spindle and hub for rotation together about the axis. Under fire conditions, the fusible or meltable material melts and disconnects the hub from the spindle so that a fire fighting water jet impinging against the lever handle cannot rotate the spindle and retract the bolt. A drain in the hub releases the melted material from the interior of the hub and permits the hub freely to rest on the spindle at a downwardly inclined angle. This assures that the melted material does not resolidify and reconnect the hub and spindle.