Safe door lock with servo motor operated cam

A safe door lock comprising a lock housing, a spring biased slam-type locking bolt slidingly retained in a guide means in said housing, said locking bolt having a bolt end extending from an edge wall of said housing to secure a safe door in a door jamb of a safe, a retracting lever pivotally secured at a pivoting end to said bolt internally of said housing, said retracting lever having engageable means for retracting said lever, retraction means engageable with said engageable means to retract said lever and said bolt into said housing, sensing switch means to detect the position of said bolt, arresting means to prevent retraction of said lever and bolt into said housing and to maintain said bolt in a locked position, a motor driven cam in said housing and co-acting with a cam follower means of said lever to displace said lever on said pivoting end to position said engageable means of said lever at a retractable position or at a locked position associated with said arresting means, cam position detection means to detect the position of said cam, signaling means to displace said cam to a lock opening positions, means to arrest said cam at said retractable position or at said locked position of said lever, a spring biased latch member slidingly retained adjacent said bolt for limiting sliding displacement in and out of said housing from said edge wall thereof, said latch member having a keeper engaging end disposed externally of said housing and a switch engaging tail end portion internally of said housing and co-acting with said sensing switch means to detect if said bolt end is disposed in a keeper plate bolt hole, said lever being spring biased against said cam, said bolt having a projecting switch actuating finger in a rear portion thereof co-acting with said sensing switch means whereby said sensing switch means can detect the position of said bolt, said cam having a disc with at least two formations formed about a peripheral edge thereof, said cam follower being disposed in sliding frictional contact with said peripheral edge, one of said formations being a lever locking formation and the other of said formations being a lever unlocking formation.