Lever 1 turns about fixed axis A and is subject to the action of flat spring 3. Latch 2 can turn about fixed axis B through the angle limited by stops a and is subject to the action of flat spring 4 bearing against lug b of the latch. When engaged, lever 1 is in the position shown in the drawing. If latch 2 is disengaged from lever 1 the latter will be returned by spring to its initial position in which it rests on stop c.
$148$SL,L$