Door chain lock and release system

A door chain lock and release system adapted for mounting on a door associated with a door jamb and provided with a door operating member, the system comprising a door safety chain having one end fixed to the door jamb and a lock and release mechanism mounted on the door adjacent the operating member, said mechanism including a base plate, a locking pin guide on said base plate, a slot in said guide adapted to receive the free end of the chain, a locking pin movable in said guide to and from a position extending across said slot in engagement with the free end of the chain, resilient means associated with said guide and engageable with the free end of the chain to eject said free end from the slot upon disengagement of the pin from said free end, a trigger pivotally mounted relative to the base plate, and actuating means connecting the trigger to the locking pin, the trigger being adapted to rest closely adjacent the door operating member and to actuate the locking pin when moved by a hand rotating the door operating member in either direction.

A door security system for use on a door having a rotatable operating member and mounted adjacent a door jamb, comprising a flexible linkage having one end connected to the jamb, a latch and release mechanism mounted to the door adjacent the operating member, said mechanism including means for securing the other end of said linkage to said mechanism and means extending from said mechanism and adapted for juxtaposition with the operating member for actuating said securing means to release the linkage from the securing means when said juxtaposed means is moved by manual rotation of the operating member.