US Patent: 1,602,620
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| Automatic Nut Wrench
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Patent Dates:
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| Applied: |
Aug. 30, 1924 |
| Granted: |
Oct. 12, 1926 |
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Patent Pictures:
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John V. Larson and August Kuring patent October 12, 1926 |
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Description: |
| The focus of this patent is the interposed spring which tends to close the movable jaws. The outside lever is to relax the spring tension when the self-closing feature is not desired.
The self-closing feature worked well until the spring failed. A few examples have survived the intervening decades. The shape and placement of the gear teeth were addressed in Larson's subsequent patent (no. 1,830,033).
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