Tools – Wrench – screwdriver – or driver therefor – Rigid jaws
Patent
1989-12-06
1990-06-05
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Rigid jaws
B25B 1306
Patent
active
049303783
ABSTRACT:
A wrench of either a socket or closed-end type is disclosed as including a closed wrench opening (30, 30a, 30', 130, 130a, 130', 230, 230') having curved engagement surfaces that connect associated pairs of flat surfaces. The curved engagement surfaces engage a conventionally toleranced hexagonal fastener without any engagement thereof by the flat surfaces. In one embodiment, the wrench opening (30, 30a, 30', 230) has a "six-point" construction including six circumferentially extending flat surfaces and six pairs of angularly oriented flat surfaces. In another "twelve-point" embodiment, the wrench opening (130, 130a, 130', 230) has twelve pairs of angularly oriented flat surfaces connected by the curved engagement surfaces. Connecting surfaces of the wrench opening connect the flat surfaces in both the "six-point" and "twelve-point" versions. The curvature of the engagement surfaces preferably has a specified relationship with respect to the size of the wrench opening and with respect to the connecting surfaces which are also curved, and the preferred angularlity of the flat surfaces with respect to the wrench opening is also specified.
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David S. Colvin
Meislin D. S.
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