Door edge mounted lock for refrigerated store-room - has bolt locked from outside capable of unlocking from inside

摘要

The lock has a box (8) in which oscillates a pawl (10) cooperating with a fixed wall hook (5) and an unbolting drive (11) for the pawl. The unbolting drive has a bolt (28) mounted rotatably in the box about an axis (29) perpendicular to that (24) of the pawl, about two positions in which it blocks or unblocks the oscillating movement of the pawl. A small piston (38) is incorporated in the box to displace the bolt between the two extremee positions, the axis of the piston cylinder coinciding with that of the bolt.