Trip and release type control mechanism comprises, between two laterally spaced bed-plates, a trip knob, a release knob, a main connecting rod, a secondary connecting rod, a retaining connecting rod, a control cam, a click, or latch and a release lever. The release lever extends parallel to the bed-plates and pivots about a pin parallel to the bed-plates. The click or latch abuts against a catch stop of release lever, with movement of the release lever being practically perpendicular to the click or latch at the level of the catch stop.
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