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US 6,178,658 B2Granted
Micrometer
AssigneeMitutoyo Corporation
InventorSatoshi Koga
Life of this patent
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Abstract
An inside of a U-shaped frame of a micrometer is made of a material having a smaller linear thermal expansion coefficient than an outside of the U-shaped configuration. Furthermore, a spindle can be made of a material having an extremely small linear thermal expansion coefficient. Accordingly, thermal deformation of the micrometer can be made smaller, and measurement accuracy is maintained even under a widely changing temperature.
Claims7
A micrometer comprising:
- a frame having a U-shaped configuration;
- an anvil provided on an end of the frame;
- and
- a spindle provided on the other end of the frame to move forward and backward relative to the anvil,
- wherein the frame is made of a material of which the linear thermal expansion coefficient is smaller at an inside of the U-shaped configuration than at an outside thereof.
2 more elements
Dependencies are inferred from the claim text.