Quarter-turn latches

Quarter-turn latches are used to securely hold and lock hatches, container lids, machine covers and similar. The lock is closed or opened by turning it through 90°. This moves the cross pin in the locking bolt through a curve in the bottom part of the lock, thus tensioning the spring. At the end point of the curve there is a little recess in which the cross pin engages. The pretensioning force generated in the lock by the spring ensures that the connection is held securely despite any vibrations.

All components in the locking system (locking bolt, retaining washer and bottom part) are captive components which are joined to the cover or the frame. They are operated through a slot, cross slot, or without tools using a knurled knob or star grip. The quarter turn latch always consists of a 1/4 turn lock, retaining washer and lock bottom part.