US Patent: 2,159,162
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| Tap Holder Chuck
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Patentee:
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| Carl W. Johnson (exact or similar names) - Brooklyn, Kings County, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 29, 1936 |
| Granted: |
May 23, 1939 |
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Joel Havens
"Vintage Machinery" entry for American Machine & Foundry Co. (AMF)
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Description: |
| Claim:
In devices of this type it is usually desirable to provide means which allow a tap, or other tool Sto be quickly inserted and removed from the chuck in order that a minimum of time may be consumed in change of tool. In prior devices it has been customary to use screw threaded members for adjusting the centralizing elements or gripping jaws which bear upon the shanks of these tools. It is obvious that with this kind of a structure it is not possible to effect an extremely rapid change of tool because of the necessity of screwing parts thereof into proper position. |
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