AUTOMATICALLY LOCKING DEVICE PROTECTED AGAINST BREAKING IN AND HOLDING DOOR PARTIALLY OPEN Russian patent published in 2001 - IPC

FIELD: locking technique. SUBSTANCE: device includes members with axial joints. First member is anchored in immobile state and has guarded fastening hole with access to it, other members are movable and are kept in initial fixed position under action of springs under non-working condition. In this position lock engages mobile member preventing it from moving. Device also has lock with latch that can be opened both by key through locking mechanism and with the aid of guarded elbow from indoors. This elbow can interlock latch against opening by key or disconnect it completely. With closing of door locked member is locked in hole of interlocking lock and door is held in partially open position. To render door partially open one should release one of movable members from engagement with lock. This can be executed by key from outdoors or without key from indoors and after this door opens partially and clearance for access to keyhole of locking mechanism from outdoors emerges. Locked member can be released from latch through this clearance with the use of key which leads to complete opening of door and same can be done without key with the help of elbow from indoors. EFFECT: improved convenience of usage of this locking device. 2 cl, 3 dwg