DEVELOPMENTS FOR MAGNETIC LATCHES

摘要

A self-latching device is disclosed which is arranged to latch, in a predetermined position, two members which are otherwise movable relative to each other such as a hinged gate. The device comprises a latch arm having a latch element and a manual actuator mounted on one of the members and which is movable between a latched and a retracted position, by upward manual displacement of the actuator, and a retaining element incorporating a permanent magnet mounted on the other member. The latch arm is spring biased into the retracted position but, when in the predetermined position, is caused to move by the magnetic field generated by the magnet in to the latched position wherein any substantial relative movement of the two member s is prevented by the latch arm engaging the retaining element. A lost motion connection is provided between the actuator and the latch element either by being in the form of a flexible line or through a multiple element linkage such that upon latching, the actuator falls to a rest position without applying any substantial load on the latch element.