US Patent: 5,250,896 - Hand-Held Magnetic Contact Tachometer with Toothed Rotatable Wheel


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US Patent: 5,250,896

Hand-Held Magnetic Contact Tachometer with Toothed Rotatable Wheel

Patentees:

Daniel Mieczkowski (exact or similar names) - Kenosha, WI

Robert J. Holmen (exact or similar names) - Kenosha, WI

Robert D. Johnson (exact or similar names) - Kenosha, WI

John E. Stanley (exact or similar names) - Racine, WI

USPTO Classifications:

324/174, 73/529

Tool Categories:

Assignees:

Snap-On Tools Corp. - Kenosha, WI

Manufacturer:

Not known to have been produced

Witnesses:

none listed

Patent Dates:
Applied:	Jul. 12, 1991
Granted:	Oct. 05, 1993

Patent Pictures:

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Snap-On Tools Company History

Description:

Emrich & Dithmar - patent attorneys

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.