Ball head polygonal wrench
First Claim
Patent Images
1. A wrench with a polygonal cross section comprising:
- a drive shank portion having a longitudinal central axis; and
a drive head portion secured to said shank portion and having a plurality of curved sides disposed polygonally with the outermost portions of said sides being spaced from the longitudinal central axis by a distance of 1/2D and with the center of curvature of each curved side being displaced from said longitudinal central axis by a distance substantially equal to 1/2D (1-cos σ
) where ##EQU3##
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Abstract
A wrench with a polygonal cross section includes an integral drive shank portion, a neck portion, and a drive head portion in a coaxial relationship along a central axis. The head portion has curved sides corresponding to the same number of sides as the shank portion with the radius of curvature of the sides being displaced outwardly from the longitudinal axis of the wrench so that each side substantially conforms to a portion of an ellipse whose minor axis lies along the central axis. The surface of the neck portion substantially conforms to an inwardly curved surface of revolution whose axis of revolution lies along the central axis of the wrench.
81 Citations
8 Claims
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1. A wrench with a polygonal cross section comprising:
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a drive shank portion having a longitudinal central axis; and a drive head portion secured to said shank portion and having a plurality of curved sides disposed polygonally with the outermost portions of said sides being spaced from the longitudinal central axis by a distance of 1/2D and with the center of curvature of each curved side being displaced from said longitudinal central axis by a distance substantially equal to 1/2D (1-cos σ
) where ##EQU3## - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification