Centrally operated three way lock for automatically closing rear door of animal pen for e.g. pigs

摘要

A specially shaped catch mouth (10) secured to the pivoting rear door allows three different lock conditions consisting of an unlocked state, a partly locked state preventing movement of the door in one direction, and a completely locked state. The door is designed to automatically move into a neutral closed position. A central control shaft (3) is provided, to which several locks can be coupled so that rotation of the shaft moves a lever (4) and pull rod (6), resulting in a lifting or lowering of the lock pin (9) between three different height positions.