Importance

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Abstract

An interlock switch comprises a standard snap action switch, provided with an actuating leaf, coiled at one end and fixed to the switch housing at the other end. In one application the switch is to be actuated by a door latch handle which passes between an open and a closed position by engaging the coiled actuating leaf. The leaf is initially coiled such that the coil is engaged by the latch handle early in its travel. When the latch handle is closed for the first time, the coil is unrolled to a closed coil position at the closed position of the latch handle. When the latch handle returns to the open positon, the coil re-rolls only slightly to a new open coil position displaced a short distance from the closed coil position. The coil is thus positioned so that in subsequent latch handle closings, the coil is not engaged until the latch handle approaches the closed position.

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First Claim