Importance

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Abstract

A speed and distance sensor comprises a circular magnet supported on a shaft journaled on a housing. The magnet is polarized at regular circumferential intervals and is accurately axially located within the housing. A reed switch is disposed adjacent the rotating magnet and is coupled with the varying magnetic field produced by the rotating magnet so that the reeds open and close as the magnet rotates. The reed switch is mounted within the housing on a retainer, and the retainer is selectively positionable via an adjustment screw for precisely positioning the reed switch in relation to the magnet to achieve a degree of coupling which produces a desired duty cycle characteristic in the opening and closing of the reed switch. A wiring harness is connected with the leads of the reed switch to provide for connection with an external electronic circuit. The wires and leads are accurately located by means of locators formed in the housing to promote convenient assembly. In another embodiment the reed switch mounts on the housing by means of its own lead wires, and a compensator on the housing is operable to control the amount of flux from the magnet which acts on the reed switch.

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First Claim