US Patent: 449,129
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| Monkey Wrench
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Patentee:
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| Vincent J. McDonnell (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 12, 1890 |
| Granted: |
Mar. 31, 1891 |
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Patent Pictures:
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Vincent J. McDonnell patent March 31, 1891 |
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Stan Schulz
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Description: |
| A "mutilated screw" engages rack teeth on the shank to set the adjustment. A small lever aids turning the mutilated screw. A secondary fine threaded screw that engages threads in the movable jaw provides additional adjustment.
3rd patent in an evolutionary sequence - prior patents are 402,265 and 415,183; 538,841 followed this one. |
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