Capacitive digital caliper
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United States of America Patent
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Sep 28, 2010
Grant Date -
N/A
app pub date -
Jul 20, 1999
filing date -
Jul 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A capacitive digital caliper comprises a main beam and a slider, a rack and a gear are mounted on the main beam and the slider respectively. This gear system changes the linear position x on the main beam into angular position(θ+2Nπ), and the angular position is measured by a capacitive measuring device. The capacitive measuring device of angular position is seally isolated from the rack and gear by a seal cavity and a seal member. Therefore, the caliper can be used under a poor condition at present of particulate and fluid contaminants. The present invention is particularly suitable for being used in the field of mechanical work.
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