Screwdriver handle
OwnerRobert H. Kenigsoninventor
Life of this patent
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Abstract
A screwdriver handle has helical grooves on the exterior, the threads of the helix being of a buttress type. The handle has a resilient external sleeve the interior of which fits into the helical grooves. When the user grips the sleeve and turns in normal fashion, the resiliency of the groove augments the turning action of the screwdriver blade. The sleeve may have a closed end fitting on top of the handle. The shank of the screwdriver below the handle may be enlarged, formed with circumferential grooves and provided with a resilient sleeve over the enlargement.
Claims3
A screwdriver or the like comprising a blade, a handle fixed to said blade, said handle being formed with a plurality of helical grooves around the outside and a resilient sleeve fitting tightly around the exterior of said handle, the interior of said sleeve fitting into said grooves, all of said helical grooves curving in the same direction, whereby upon the user twisting said sleeve, said sleeve is stressed and the resiliency of said sleeve augments turning action of said blades the cross-section of said grooves being of buttress-thread shape, having a slanted flank and a perpendicular flank, said perpendicular flank resisting turning of said sleeve relative to said handle where said sleeve is turned in a direction such as to cause said blade to tighten a screw with which it is engaged.
Dependencies are inferred from the claim text.