US Patent: 1,797,121
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| Micrometer Gage for Internal Threads
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Patentee:
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| Frank J. Bohn (exact or similar names) - Washington, DC |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 25, 1929 |
| Granted: |
Mar. 17, 1931 |
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Patent Pictures:
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Joel Havens
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Description: |
| Horace S. Beale - patent attorney
Abstract:
My invention is an improvement in micrometer gauges, and relates more especially to that particular type employed for accurately measuring the internal threads of a cylinder for fitting one part within another, as for instance an externally threaded cylinder bar or shaft to an internally threaded cylinder. The primary object of my invention is to to provide attachments for a conventional type of inside micrometer gauge which will adapt it for more conveniently and accurately measuring the internal screw threads of- a cylinder to correspond with the diameter of external threads on a cylinder bar or shaft to be fitted tightly within the threaded portion of the internally threaded cylinder. A further object of my invention is to provide attachments for the above mentioned purpose which can be applied to a well known type of micrometer gauge for inside measurements without requiring material alteration thereof to receive the attachments and which will not affect the ordinary use of the micrometer gauge when desired. A further object of my invention is to provide attachments for a micrometer gauge in which the end pieces of said attachments engage the threads at opposite sides of the internally threaded bore of the cylinder are removable so that any one of a variety of end pieces may be used in connection with a single set of my improved attachments.
Claim:
An attachment for the head of a micrometer gauge used in measuring the diameter of internally threaded cylinders comprising a member secured on said head and having an outwardly projecting pintle, and an end piece swiveled on said pintle and provided with projecting teeth for engaging between the walls of the thread in the cylinder.
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