US Patent: 764,550
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| Vanishing Thread Tap
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Patentee:
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| Hiram R. Borie (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 10, 1903 |
| Granted: |
Jul. 12, 1904 |
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Joel Havens
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Description: |
| Abstract:
My invention relates to a tap and finishing-tool for tapping and finishing pipe-sockets and similar ring-shaped or tubular articles and the object of my invention is to provide a tool which will not only form the screw-threads in the socket, but will also tap out the threads toward one end of said socket, so as to produce vanishing thread therein, and may also, if desired, finish the end of the socket.
Claim:
A threading and finishing tool comprising a body, one or-more threading-Cutters mounted therein, one or more unthreaded finishing-cutters also mounted in the body to the i-ear of the threading-cutters, and means for throwing said finishing-cutters out of operation while the tool is it operation. |
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