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US Patent: 4,136,457
Pin Micrometer Adapter
Klaus Langer - Santa Clara, CA

USPTO Classifications:

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers


Not known to have been produced

none listed

Patent Dates:
Applied: Mar. 13, 1978
Granted: Jan. 30, 1979

Patent Pictures:
USPTO pdf tiff
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Linval B. Castle - patent attorney


An adapter for a pin-anvil micrometer, such as used to measure wall thicknesses of small tubing. The jaws of pin micrometers can normally hold a pin of 1/16" minimum diameter while flexing approximately 0.001" and can therefore be used to measure, for example, wall thicknesses of tubing having a 1/16" diameter bore. The range adapter is an anvil extender that snugly fits over the micrometer jaws and extends the effective jaw length to near the spindle center line. Anvil pins of approximately 0.015" may then be used without flexing and the micrometer can then accurately measure distances from 1/64" holes or slots.

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