US Patent: 2,294,187
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| Apparatus for Heat Treating
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Patentees:
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| Alfred Kullman (exact or similar names) - Cincinnati, Hamilton County, OH |
| Thomas A. Waltz (exact or similar names) - Cincinnati, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 30, 1939 |
| Granted: |
Aug. 25, 1942 |
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Joel Havens
"Vintage Machinery" entry for American Tool Works Co.
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Description: |
| Claim:
This invention relates to apparatus for hardening metal screws. It is adapted particularly for the treatment of screws of relatively large diameter, for instance, lead and feed screws for lathes, ther machine tools and similar apparatus. By virtue of the relatively great length of such pieces; they tend to become distorted and warped when heated and quenched according to the usual hardening technique.
One of the primary objectives of the invention has been to provide suitable apparatus for harding such screws without heating them in their entirety, or employing the extensive conventional metallurgical apparatus which is requisite in following the usual practice. An objective of the invention also has been to provide apparatus for hardening selective portions of a screw or thread thereof, leaving other portions in their unhardened condition. |
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