Sealed mechanical configuration for electronic calipers for reli

Details Sealed mechanical configuration for electronic calipers for reli Sealed mechanical configuration for electronic calipers for reli

1995-01-06

1996-11-12

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324688, 324690, 34087037, 33705, 33558, G01R 2726, G01B 702, G01D 524, G08C 1910

Patent

active

055743811

ABSTRACT:
An electronic caliper configuration making such calipers more reliable in the presence of liquid and particulate contaminants. Included in the caliper configuration is an elongated cavity added to the main beam of the caliper. The cavity is sealed with a cover. The measuring scale element of the measuring transducer, and the associated shorter pickoff element are mounted in this cavity. The depth bar, ordinarily attached to the sliding jaw in conventional calipers, is inserted into the cavity through a hole or holes aligned parallel to the longitudinal axis of the caliper and internally joined to the moving transducer element. A conventional lip seal provides an effective seal around the diameter of the depth bar. An external portion of the depth bar is coupled to the sliding jaw of the caliper via axially rigid linkage or alternately an axially rigid flexure. In this way, the internally isolated transducer elements can be actuated by the external sliding caliper jaw. As a result, the measuring transducer elements, which are contamination sensitive, may be isolated within a cavity in a caliper which nearly maintains the preferred, historically proven form and functions to provide an electronic caliper with greatly improved reliability when operating in the traditional industrial shop environment. In one embodiment, the neutral axis of the depth bar is positioned to coincide with the neutral axis of the linkage bars, so that bending of the linkage bars and depth bar does not significantly affect the measurement accuracy.

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patent: 5485680 (1996-01-01), Nelle

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