Importance

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Abstract

Two opposed poles of a permanently magnetized circuit establish a relatively large air gap. An armature element (15) is displaceably interposed in the gap between these poles. The armature element establishes a first relatively small gap to one of these poles when in a first position of adjacency to the other of these poles, and the armature element establishes a second relatively small gap to the other of said poles when in a second position of adjacency to said one pole. Pole-fringing flux is manifested laterally of that one of the relatively small gaps which uniquely identifies the instantaneous presence of the armature in one of its two positions, and a detector of fringe flux at one of the two gaps (18) provides an indication of the positional status of the armature with respect to the poles.

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First Claim