Abstract: A releasable latch, for attachment to a door check unit having a cylinder and a piston, and serving releasably to secure a door in an open position. A lever is freely slidable along the rod of the piston and is tiltable on the rod for releasable locking engagement. A cam and follower are actuable from a pre-set position to tilt the lever into locking engagement when the door is opened beyond a predetermined limit and then released. On release of the lever from locking engagement with the piston rod the cam and follower are returned to their pre-set position.

Abstract: A blank for forming an open topped container having at least one double wall. The blank comprises an open topped single walled container having a number of side walls. The single wall container has integrally formed therewith at least one panel which is foldable into a position where it overlies one of the side walls of the container.