Capacitive digital caliper
OwnerQiliang Chen, Shaoguang Chen +3inventors
InventorsQiliang Chen, Shaoguang Chen, Haiping Liu, Yongzhong Kang, Meiying Chen
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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.
Claims13
A capacitive digital caliper used for measuring inside or outside dimensions of the measured object comprising
- a main beam with jaws on its end portion;
- and
- a slider sliding along the length of said main beam, having jaws on its end portion matching with those of said main beam, provided with a measuring display device comprising a measuring display and a measuring circuit board, wherein,
- a rack is provided along the length of said main beam, and is suitable for the range of said main beam;
- said slider is provided with a gear system comprising at least a pinion and its shaft, engaged with said rack;
- and
- a sealed cavity is provided with
- a stator plate of a first electrode forming a certain pattern fastened on said slider and electrically coupled with said measuring circuit;
- and
- a rotor plate of a second electrode forming a certain pattern concentrically opposed at a distance to said first electrode set, and fastened onto said shaft of said gear system, which penetrates through a motive sealing member on said cavity wall, and connected to said gear system outside said cavity.
Dependencies are inferred from the claim text.