US Patent: 5,218,891
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| Double-Ended Reversible Box Wrench with 71/2 Degree Swing Clearance
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 13, 1990 |
| Granted: |
Jun. 15, 1993 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Emrich & Dithmar - patent attorneys
Abstract
The double-ended reversible box wrench for use with a hexagonal fastener includes two box wrenching heads interconnected by a handle shank, with each head having a double-hexagonal socket opening therethrough, each of the outwardly directed corners of which has an axis extending through the center of the socket opening. One socket has a corner inclined at an offset angle of 33/4 degrees to the shank axis and the other socket has a corner inclined at an offset angle of 111/4 degrees to the shank axis so that, by sequential application of the four wrench faces to a hexagonal fastener, the fastener maybe repeatedly rotated in the same direction while the wrench undergoes a swing of no more than 71/2 degrees during any one application. A wrench with offset angles of zero degrees and 10 degrees and a pivoting head wrench are also disclosed.
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