US Patent: 1,797,122
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| Micrometer Gauge 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 between the walls for fitting one part within another, as for instance an externally threaded cylinder, bar, or shaft to an internally threaded cylinder, the present application being a division of the application filed by me May 25, 1929.
The primary object of my invention is 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 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 portions engaging the threads at opposite sides of the internally threaded bore of the cylinder are removable with respect to said attachments so that any one of a variety of engaging portions may be used in connection with a single set of my improved end pieces or attachments.
Claim:
An attachment for the outer end of the rod of a micrometer gauge for measuring the diameter of an internally threaded cylinder comprising a member mounted on the outer end of the rod, said member having a centrally cut slot, at its outer end, an inset piece lodged in the slot and secured by a pin passing through the parts transversely, said inset piece terminating in an arc-shaped tooth angular in cross-section for engaging between threads to contact with the walls thereof, and means for securing said member on the rod. |
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