US Patent: 2,172,561
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| Wrench
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Patentee:
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| Frederick P. Kruse (exact or similar names) - Berkeley, CA |
| USPTO Classifications: |
| 81/53 |
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Patent Dates:
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| Applied: |
Jun. 14, 1937 |
| Granted: |
Sep. 12, 1939 |
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Patent Pictures:
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1 | 2
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Patent 2,172,561 - edited drawing |
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Stan Schulz
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Description: |
| "The principal object of my invention .. is to provide a wrench for straining bolts and stud bolts to predetermined and uniformly accurate tension." The mechanism is a form of adjustable friction clutch.
The patent was used in one style of Jo-Line torque wrenches, and was "improved" by a subsequent series of patents. (see also 2,310,759, 2743,678, 2,897,704 and 3,016,773) Jo Mfg. was acquired by K-D in 1979. |
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