Driver with fastener retention means

Details Driver with fastener retention means Driver with fastener retention means

1990-05-22

1993-08-24

Kisliuk, Bruce M.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81460, 81436, 81451, B25B 2300

Patent

active

052378934

ABSTRACT:
A fastener drive tool for applying a rotational torque to a threaded fastener for driving the fastener into or out of a workpiece. The drive tool has an elongated shaft portion with a free end which is engageable with a recess formed in the fastener. Alternating merging concave and convex partially-cylindrical surfaces are formed on the outside of the shank towards the free end of the drive tool. The axes of curvature of the concave and convex partially-cylindrical surfaces are generally parallel to one another. The drive tool has at least one interlobular fastener retention piece attached between two convex partially-cylindrical surfaces which engage a corresponding convex partially-cylindrical surface formed in the fastener recess. The interlobular fastener retention piece releasably retains the fastener on the drive tool when the drive tool is engaged with the recess formed in the fastener and prevents wobbling of the fastener when it is driven by the drive tool.

REFERENCES:
patent: 2083092 (1937-06-01), Richer
patent: 3584667 (1971-06-01), Reiland
patent: 4060114 (1977-11-01), Matsushima
Line Head System, Inc., Fastening System Brochure, Date approximately 1990, General Reference.
Snap-on Medical Products, "Captive Twist" Information Sheet, Date approximately 1990, General Reference.

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