US Patent: 612,589
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| Wrench
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Patentee:
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| Davic C. Johnston (exact or similar names) - Marietta, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 23, 1898 |
| Granted: |
Oct. 18, 1898 |
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Patent Pictures:
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David C. Johnston patent October 18, 1898 |
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Stan Schulz
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Description: |
| The adjusting sleeve interacts with right-hand and left-hand threaded portions on the main shank and short shank of the movable jaw to set the size. The sections of the adjusting sleeve have corresponding right- and left-hand threaded portions.
The specifications note the jaws can have teeth for gripping pipe or be smooth for nuts. |
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