US Patent: 5,239,899
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| Wrench with Inclined Drive Faces
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Patentee:
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| David R. Baker (exact or similar names) - Fort Worth, TX |
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Patent Dates:
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| Applied: |
Nov. 12, 1991 |
| Granted: |
Aug. 31, 1993 |
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Patent Pictures:
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ADJUSTABLE RAPID WRENCH / US PAT 5239899 AND PAT PEND - Doug Busch collection |
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Stan Schulz
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Description: |
| James E. Bradley - patent attorney
Abstract
A wrench for driving a nut utilizes curved drive faces. The drive faces are convex and protrude inward toward a center line between the jaw portions. Notches are formed on each drive face near the free end. One wrench is adjustable, having a positioner that pushes the nut outward as the movable jaw closes. The positioner maintains the nut in a position in contact with the curved drive surfaces.
Known example marked "ADJUSTABLE RAPID WRENCH / US PAT 5,239,899 AND PAT PEND ."
CROSS REFERENCE TO RELATED APPLICATION
This invention is a continuation-in-part of Ser. No. 657,139, now abandoned, filed Feb. 15, 1991, David R. Baker, entitled "Open End Wrench".
See also, patent 5381710. |
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