US Patent: 4,246,811
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| Ball head polygonal wrench
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Patentees:
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| John R. Bondhus (exact or similar names) - Monticello, MN |
| Fred L. Heim (exact or similar names) - Millersville, PA |
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Patent Dates:
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| Applied: |
Sep. 24, 1979 |
| Granted: |
Jan. 27, 1981 |
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Patent Pictures:
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John R. Bondhus and Fred L. Heim patent 4246811 - edited image |
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Stan Schulz
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Description: |
| The patent incorporates a mathematical formula for determining the curvature of the head and neck in relation to the number of sides of the polygon. See also Canada Patent CA-1,122,821.
The specifications cite previous U.S. patents 3,213,719, 3,940,946 and 4,080,079 and British patents GB-548615 & GB-876,781 as references.
Marketed as the "BALLDRIVER." |
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