DOOR LATCH Russian patent published in 2018 - IPC E05C3/26 

FIELD: locks.

SUBSTANCE: invention relates to lock finish hardware, in particular to door latches, by means of which it is possible to lock the living and service rooms from one (inner) side. Door latch comprises a body, an internal and external L-shaped handles freely disposed on a square rod, axially movable with a cam mounted thereon. Spring-loaded bolt engages with the cam, and a rod control mechanism is located at the end in the through hole of the internal L-shaped handle coaxially with the rod. Rod control mechanism is in the form of a Z-shaped arm pivotally attached at one end to the free end of the rod spring-loaded in the axial direction by a compression spring, on the axis perpendicular to the axis of the rod, spring-loaded by means of a torsion spring, one end of which is fixed to the rod, and the other end is fixed to the Z-shaped arm, rotatably in the plane of the axis of the rod, interacting in the extreme positions of fixation by its surfaces with cavity surfaces made at the end of the internal handle, with the possibility of exceeding the free end in the extreme positions of fixation of the outer dimensions of the internal handle. Groove on the square rod is made between the cam and the external handle. Rob control mechanism is configured to initially move the rod axially towards the control mechanism.

EFFECT: technical result is expanded operational capabilities through increased safety.

1 cl, 4 dwg