Deadlocked latch having disc and motor actuators

A lock mechanism including a casing structure, a spring biased rotatably mounted latch bolt urged to one of a predetermined latching position and a predetermined unlatching position with respect to said casing structure, and operating means for effecting rotation of said latch bolt to the other of said predetermined latching and unlatching positions;

• said operating means including, disc means comprising a relatively thin, generally circular, generally disc-shaped plate having a center and mounted for rotation about its said center and also operatively coupled with said latch bolt, key-rotatable lock cylinder means, means operably coupling said lock cylinder means with said disc means such that rotation of said lock cylinder means will provide said rotation of said latch bolt to said other position, link means operable coupled to said disc means by a lost motion type of connection, and remotely controllable means for operating said link means for effecting rotatable movement of said disc means to effect said rotation of said latch bolt to said other position, said lost motion connection accommodating rotation of said disc means by said lock cylinder means independently of said remotely controllable means;
• wherein said link means includes both a yieldable, resilient spring-like portion, and means for defining a second lost motion type of connection, interposed intermediate said electrical drive means and said disc means for substantially preventing stalling of said electrical drive means in response to external force applied to said latch bolt for preventing said rotation thereof to said other position.

A lock mechanism including a casing structure adapted to be mounted to one of a door and a door frame and having a front plate with an aperture therein;

• a latch bolt mounted with respect to said casing structure for movement between a first position for latching engagement with the other of said door and door frame, and a second, retracted position wherein said latch bolt is held out of position from said latching engagement;
• a deadlock member mounted to said casing for movement between a blocking position wherein said deadlock member will prevent movement of the latch bolt to said second, retracted position, and a non-blocking position wherein said latch bolt is free to move to said retracted position;
• an operating disc comprising a relatively thim, generally circular, generally disc-shaped plate having a center and mounted for rotation about its said center and also operatively coupled to move said latch bolt through a lost motion type of connection;
• and control means for effecting selective movement of said operating disc to move said latch bolt to the retracted position, with the initial rotation of said operating disc resulting in the movement of the deadlock member to the non-blocking position, with said lost motion connection delaying movement of said latch bolt until said deadlock is moved from the blocking position;
• wherein said control means comprises electrical drive means mounted within said casing structure and operatively coupled for moving said operating disc in the direction for moving the latch bolt to the second position, and electrical control circuit means including a first circuit portion within said casing structure and second circuit portion at a remote security location, said electrical drive means being responsive to predetermined signal conditions of said first and second circuit portions for rotating said operating disc only in response to the simultaneous existence of predetermined signal conditions of both of said first and second circuit portions;
• wherein said second circuit portion comprises remotely located control means selectively actuatable for providing energizing current for said drive means;
• wherein said first circuit portion includes position switch means responsive to the position of said drive means for controlling the flow of energizing current to said electrical drive means in a predetermined fashion in accordance with the position thereof;
• and wherein said first circuit portion means further includes safety switch means responsive to said electrical drive means and said latch bolt for actuation when the latch bolt is in its first position, and de-actuation when the drive means has moved the latch bolt to its second position;
• said safety switch means when actuated applying said energizing current to said position switch means.

An electrically operated lock system comprising a lock mechanism including a casing structure;

• a latch bolt movable between a predetermined latching position with respect to said casing structure, and a second, non-latching position;
• a deadlock member mounted to said casing for movement between a blocking position wherein said deadlock member will prevent movement of the latch bolt to said non-latching position, and a non-blocking position wherein said latch bolt is free to move to said non-latching position;
• an operating member coupled to operate said latch bolt through a lost motion type of connection;
• electrically operated drive means for effecting selective movement of said operating member to move said latch bolt to the retracted position, with the initial movement of said operating member resulting in the movement of the deadlock member to the non-blocking position, with said lost motion connection delaying movement of said latch bolt until said deadlock is moved from the blocking position;
• and electrical circuit means for controlling operation of said electrical drive means for movement of said operating member;
• wherein said circuit means includes sensing means carried in said casing and adapted to provide electrical signals indicative of the condition of said lock mechanism;
• and wherein said sensing means comprises a latch switch and an unlatch switch respectively positioned to be actuated by said electrical drive means when said electrical drive means is respectively in a first position wherein said latch bolt is free to move to said latching position and in a second position wherein said drive means is in a position for normally moving said latch bolt to said non-latching position;
• said sensing means further including a safety switch disposed for detecting correspondence between the position of said electrical drive means and said latch bolt;
• said circuit means further including a remotely located door control switch for remotely controlling operation of said electrical drive means.