US Patent: 771,528
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| Threading Mechanism
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Patentee:
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| Harry E. Boyd (exact or similar names) - Wheeling, Ohio County, WV |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 25, 1903 |
| Granted: |
Oct. 04, 1904 |
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Joel Havens
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Description: |
| Abstract:
The object of my invention is to provide means for automatically opening the dies when the desired length of thread has been cut, thus insuring uniformity in the threads on all the pipes or rods. Ordinary pipe-threading machines are provided with a rotating chuck or gripping device for holding and rotating the pipes. The dies are stationary and are usually mounted in two segmental holders which are pivoted to a base-block and at their upper ends are provided with projections which are engaged by cam-grooves in a rotary disk having a handle or lever by which the dies are opened and closed. The chuck or gripping device is provided with suitable means for opening and closing the same, and this means is usually operated by a lever which projects toward the dies, so as to be within reach of the attendant.
Claim:
In a threading-machine, the combination with a rotating chuck, of stationary separable dies, a cam for opening and closing- said dies, means tending normally to rotate said cam to open the dies, a lock arranged to hold said rotating means against action, and means projecting into the path of the article being threaded for releasing said lock. |
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