Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Patent
1992-01-31
1993-10-12
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
81436, B25B 2300
Patent
active
052515214
ABSTRACT:
A drive element for use with TORX.sup..RTM. compatible fasteners with an elliptical cross-section attached to an elongated shaft along the central longitudinal axis of the shaft. The minor axis of the ellipse extends along the central longitudinal axis of the elongated shaft. The elliptical cross-sections of the drive element are located on planes which pass through the minor axis. A major axis plane perpendicular to the minor axis is located at the center of the drive element. The drive element has elevations forming drive lobes and depressions which traverse a longitudinal elliptical path on the surface of the drive element. The lobes and depressions are substantially complimentary to the inner surface of a fastener cavity at the major axis plane. Starting at the major axis plane, the lobes become narrower as they approach the minor axis. The centers of curvature for the tops of the lobes are a series of points which define a first reference circle on the major axis plane with the minor axis as the center. The centers of curvature for the bottoms of the depressions are a series of points which define a second reference circle concentric with the first circle, also on the major axis plane. The drive element of the present invention can effectively transmit increased levels of torque to the fastener even when pivoted with respect to the fastener cavity.
REFERENCES:
patent: 1274254 (1918-01-01), Fleek
patent: 2951396 (1960-09-01), Kooistra
patent: 2984995 (1961-05-01), Kalen
patent: 3427825 (1969-02-01), John et al.
patent: 3635048 (1972-01-01), Monti
patent: 3940946 (1976-03-01), Andersen
patent: 4246811 (1981-01-01), Bondhus et al.
patent: 4824418 (1989-04-01), Taubert
Blackston Michael D.
Burda Dennis A.
Bondhus Corporation
Smith James G.
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