US Patent: 2,696,386
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| Chuck
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Patentees:
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| Joseph C. La Mastra (exact or similar names) - Stratford, Fairfield County, CT |
| Ernest H. Johnson (exact or similar names) - Bridgeport, Fairfield County, CT |
| Assignees: |
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Bullard Co. - Bridgeport, Fairfield County, CT |
| Manufacturer: |
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Bullard Co. - Bridgeport, Fairfield County, CT |
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Patent Dates:
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| Applied: |
Feb. 05, 1953 |
| Granted: |
Dec. 07, 1954 |
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Joel Havens
Vintage Machinery entry for Bullard Machine Tool Co.
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Description: |
| Claim:
The gripping of thin-walled workpieces in chucks during turning operations has always presented a serious problem, particularly where tolerances are at all critical. In the past thin-walled workpieces have usually been held in three- and four-jaw chucks, either by an external contracting action or an internal expanding action. Such chuck actuation causes distortion of the thin-walled workpiece to such an extent that although accurate turning of the workpiece could be effected, release of the workpiece from the chuck would cause distortion of the workpiece to such an extent that it was impossible to maintain the required tolerances in many instances. Various modifications of the chuck jaw surfaces including the increasing of the area of contact between the jaw surfaces and the workpiece have, in some instances, lessened the condition of distortion, however, all of the known prior art modifications to overcome this difficulty have not satisfactorily solved the problem.
The principal object of the present invention is to provide a chuck construction that will rigidly grip a thin- walled workpiece and maintain it in an undistorted condition throughout a working operation thereon. |
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