US Patent: 2,309,668
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| Grinding Machine
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Patentee:
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| John E. Poorman (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 10, 1941 |
| Granted: |
Feb. 02, 1943 |
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Joel Havens
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Description: |
| Claim:
In conventional grinding machines, it is customary to provide for automatic operation after the setting of the machine for the desired grinding. Thus in such conventional machines the table or other material base is set for a predetermined limited movement for the desired grinding and during the final step of this movement mechanism is set in motion to reverse the operation of the drive for the return of the table, and, if desired, a further grinding during such return. It not infrequently happens that there is a variation in motion between the time the automatic reversing mechanism commences to operate and the completion of that operation, which variation is not infrequently due to inaccurate timing, wear of parts, or momentum overrun. |
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