Dual action switch assembly

Abstract

This invention relates to an improved dual action switch assembly in which each of two pairs of electrical contacts is alternatively locked in open position by a tensioned locking element upon the interaction of a driving mechanism partially positioned within a frame on a slider unit. The switch assembly in a preferred form includes a base, two movable contact arms and two corresponding fixed contact brackets mounted on the base. The contact arms are mounted for pivotal rotation about mounting terminals. A biasing member, as for example a coil spring, is attached to each of the contact arms to provide a resilient force against pivoting opening movement of the contact arms. A tensioned locking element, preferably formed of two bent, over-center, leaf springs, is mounted between the slider unit and the base. The slider unit is capable of slidable movement along the base upon the action of a driving mechanism such that the slider unit alternatively contacts one of the contact arms at a time, causing that contact arm to pivot and separate from its connection with its corresponding contact bracket. When this occurs the tensioned locking element locks the contact arm and contact bracket in an open position until the driving mechanism reverses to cause the slider unit to actuate the other contact arm, causing the tensioned locking element to unlock, move through its maximum point of tension and relock the latter contact arm and contact bracket in open position.