| 摘要 |
A wrench opening (14,14') is disclosed as having particular utility for use with a socket (10) or closed end wrench (34) and includes inwardly convex engagement surfaces (16) defining a closed shape and having continuously curved end portions (16a, 16b) that provide greater surface-to-surface engagement with a nut or bolt head to be torqued than is possible with conventional flat engagement surface portions. The curvature of the engagement surfaces 16 is selected to provide maximum surface-to-surface engagement when normal tolerance deviations are involved. Connecting surfaces (20 or 22) extending between the engagement surfaces (16) are constructed to provide improved stress distribution and reduced tooling cost.
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