Fast rotary drive for a handheld micrometer
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United States of America Patent
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Apr 7, 2015
Grant Date -
Nov 21, 2013
app pub date -
May 15, 2012
filing date -
May 15, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A micrometer drive configuration for a handheld micrometer comprises: a frame; a spindle; a linear displacement sensor that senses a displacement of the spindle; a threaded spindle drive having a relatively coarse thread pitch, wherein the threaded spindle drive is attached to a spindle drive gear; a planetary drive gear that mates to the spindle drive gear; a ring gear surrounding and mating to the planetary drive gear; and a thimble generally surrounding the spindle drive gear, the planetary drive gear, and the ring gear. The thimble is coupled to drive the spindle drive gear through the planetary drive gear, and the planetary drive gear is sized and mounted such that the spindle drive gear turns faster than the thimble.
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