Abstract: Latch device composed of a container (51) in which there is a slider (52), inserted in a guide (60), controlled in translation by a spring (53) and comprising a hook (68) to catch a hooking element (59) placed on a door. A track (40), with the bottom defining the profile of a cam on one side of the guide (60), is travelled along by a ball (73) placed on the slider (52) and held pressed by a spring (72) against the bottom of the track (40) to determine the four open, closed, released and locked positions of the door according to the position of the ball in the track.

Abstract: A locking device applies to a casing having a cover and a seat for opening and closing of the casing. The locking device has a recess formed on an edge of the seat, a buckle downwards protruding from the cover and matching the recess, and a roller parallel-disposed in the recess and pivoted to the seat. The buckle has an arcuate face smoothly against an upper slot of the roller for closing and opening the casing. A direction of lifting of the cover corresponds to a rotation of the roller so that a direction of applied force can be continuously unchanged to achieve an ergonomic effect.

Abstract: A security knob assembly for a panel including a pet door, mounted on the panel remotely from the pet door, the security knob assembly including a latch movable between lock and unlock positions, the latch being operated by rotation of a knob after the knob is pushed in axially from a disengaged to an engaged position. The knob has an array of pins that engage an array of holes when the knob is pushed in to operate the latch. The latch may also be operated by a key cylinder, and the mechanism provides a plug to plug up the opening to the mechanism when a key cylinder is absent.