US Patent: 2,135,912
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| Internal Diameter Micrometer
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Patentee:
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| John Rae (exact or similar names) - Ellwood City, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 20, 1936 |
| Granted: |
Nov. 08, 1938 |
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Joel Havens
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Description: |
| Usiua & Rauber - patent attorneys
Abstract:
The present style internal diameter micrometer is not ordinarily adapted to be conveniently used in various length or diameter tubing, cylinders or the like. The object of this invention is to provide an internal diameter micrometer which is sturdy, easily operated, positively acting, relatively inexpensive and adapted to be readily changed so that it can operate in tubing or the like of various sizes and lengths.
Claim:
An inside diameter micrometer comprising a standard micrometer including a head, a body and a spindle, an extension tube secured to said spindle, a barrel removably connected to said body, bearings positioned on said tube, a spindle having a pad at one end secured to the free end of said tube, a threaded collar free on said spindle, a cylindrical headstock receiving the pad of said spindle and engaging with said collar whereby axial motion only is transmitted to said head- b stock from said spindle, a rectangular cover connected to the free end of said barrel, a box having open ends and a tapered aperture through two opposite sides removably connected to said cover, slides snugly received in said box and limited to motion in a plane perpendicular to the axis of said headstock, a wedge block which is rectangular in cross-section and trapezoidal in longitudinal section having its tapered sides at an angle of. 53 degrees, 8 minutes with each other received in said aperture in said box and mounting said slides by means of a sliding interlock, said wedge being removably secured to said headstock, a tailstock integral with said wedge extending out perpendicularly from the base of said wedge, a guide positioning said tailstock removably secured to said box, anvils removably secured to said slides, springs positioned around said anvils, and end covers which force said springs against said slides, said end covers covering the end of said box and being removably secured thereto.
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