US Patent: 2,918,834
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| Predetermined Torque Release Wrench
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Patentee:
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| James W. Cranford (exact or similar names) - San Gabriel, CA |
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Patent Dates:
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| Applied: |
Mar. 03, 1958 |
| Granted: |
Dec. 29, 1959 |
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Patent Pictures:
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James W. Cranford Patent Dec. 29, 1959 |
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Stan Schulz
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Description: |
| The patent discusses two problems of torque wrenches. 1. How to insure that the torque limit is not inadvertently breached by "follow through" once the preset limit has been reached. 2. How to accurately calibrate and recalibrate the tool so that it is accurate.
The patent along with nos. 3,165,014 and 3,270,594 appears on Sears, Roebuck & Co. CRAFTSMAN No. 44441 torque wrench.
The patent cites several earlier patents as references: 2,601,799, 2,704,472, 2,731,865, 2,732,747, 2,734,411, 2,743,638, and 2,792,733.
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