Double-throw bar lock having independently operable cylinders

摘要

A bar lock comprising two toothed plates (1) and (2) and a rotatable cross element (3) which transmits movement to said plates. The cross element (3) is operated by two mechanisms, one internal and one external, which act independently of each other; the internal mechanism is composed of elements which are specular to the elements of the external mechanism. Each of said mechanisms comprises the following elements: a recess (25) provided in the base plate (18) and in the counter-plate (12) respectively; a rotary element (5) rotatable within said recess, the rotary element having a seat for entraining a roller (6) and having engagement means for engaging a tang of a cylinder or knob; a disc (7) rotatable with the cross element (3) and having notches (26) and (27); a slider (9) maintained in contact with the cross element by a spring (10) fixed to a spring-guide block (14). The toothed plates (1) and (2) are operated when the roller (6) engages in one of the notches (26) and (27) to make the rotatable circular element (5) rotatable with the disc (7), such that the cross element (3) is rotated by rotation of the cylinder or knob.