US Patent: 1,830,033
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| Automatic Nut Wrench
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Patentee:
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| John V. Larson (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Mar. 26, 1931 |
| Granted: |
Nov. 03, 1931 |
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Patent Pictures:
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John V. Larson patent November 3, 1931 |
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Stan Schulz
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Description: |
| Automatic wrench patents begin with August Kinderman's Jan. 25, 1870 design patent D3,821. By the 1920s, the patents focus on very subtle features. This patent's focus is on the shape and placement of the gear teeth so that maximum holding power coincides with standard nut sizes falling within the capacity of the wrench.
LARCOLOY automatic nut wrenches used this patent and nos. 1,602,620 and 2,351,821. This patent was also used for Hedstrom Industries LARC-O-MATIC. |
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