US Patent: 4,441,021 - Luminosity Probe for Diesel Engine Timing Apparatus


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US Patent: 4,441,021

Luminosity Probe for Diesel Engine Timing Apparatus

Patentees:

Gene E. Olson (exact or similar names) - Kenosha, WI

Jerome A. Thompson (exact or similar names) - Milford, MI

Donald D. Grover (exact or similar names) - Kenosha, WI

Christopher B. Stout (exact or similar names) - Kenosha, WI

Thomas P. Becker (exact or similar names) - Kenosha, WI

USPTO Classifications:

250/227.11, 73/117.3

Tool Categories:

Assignees:

Snap-On Tools Corp. - Kenosha, WI

Manufacturer:

Not known to have been produced

Witnesses:

none listed

Patent Dates:
Applied:	Jul. 23, 1981
Granted:	Apr. 03, 1984

Patent Pictures:

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Snap-On Tools Company History

Description:

Dithmar, Stotland, Stratman & Levy - patent attorneys

Abstract

The probe includes a tubular housing having a first portion and a second portion. The first portion is adapted to be mounted in place of the glow plug of a selected engine cylinder. A light pipe within the first portion directs light from the combustion zone to a phototransistor within the second portion. The front of the first portion has a reduced size aperture defined by an internal shoulder against which the front of the light pipe is seated. The rear of the first portion carries resilient sealing means which is deformed when the second portion is telescoped thereon so as to provide a detachable, frictional, light-tight thermally insulated connection therebetween. A phototransistor is mounted within the second portion to convert light passing through the light pipe into electrical signals. A cable carries these electrical signals to processing equipment. A base resistor is located in the second portion between the base of the phototransistor and the cable. The part of the first portion that projects from the engine is short with respect to the part that fits into the engine. The projecting portion carries wrench-engaging bosses.