US Patent: 493,829
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| Wrench
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Patentee:
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| Peter Mandigo (exact or similar names) - Dover, NJ |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 09, 1892 |
| Granted: |
Mar. 21, 1893 |
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Patent Pictures:
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Peter Mandigo patent March 21, 1893 |
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Stan Schulz
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Description: |
| A ring with partial interior threads is placed between upper and lower sections of the movable jaw. The threads engage with rack teeth on the main shank. This arrangement allows for quick adjustment. A spring pin on the adjusting sleeve engages a notch in the movable jaw frame to hold the adjustment. |
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