Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1991-07-12
1993-10-05
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
73529, G01P 3488
Patent
active
052508960
ABSTRACT:
A hand-held contact tachometer includes an elongated hollow handle comprising two interconnected members defining a clevis at one end thereof and carrying therewithin a magnetic sensor disposed adjacent to the clevis and conditioning circuitry coupled to the output of the sensor. The clevis has hub portions defining an axle on which is rotatably mounted a contact wheel of molded construction including a body of non-magnetic material in which is embedded a toothed magnetic wheel and a bearing. The wheel is provided with a frictional ribbed surface on its outer periphery to facilitate engagement with an associated moving surface, thereby rotating the wheel to generate a pulsating signal having a frequency proportional to the speed of the moving surface.
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Holmen Robert J.
Johnson Robert D.
Mieczkowski Daniel
Stanley John E.
Edmonds Warren S.
Snap-on Tools Corporation
Strecker Gerard R.
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