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US 4,590,651 AGranted
Sharpener for phillipshead screwdrivers
OwnerJoseph D. Robertsinventor
Life of this patent
Estimating the term…
Abstract
The invention will sharpen worn phillipshead screwdrivers. The invention contains four files that fit into the grooves of a phillipshead screwdriver. The worn phillipshead screwdriver is sharpened when the worn phillipshead screwdriver is moved in-and-out of the invention.
Claims4
A sharpener for phillipshead screwdrivers comprising:
- an elongated hollow body having a central longitudinal axis, four triangular cross section files extending parallel to the longitudinal axis of said body, means pivotally mounting one end of each of said files in said hollow body for radial movement, the other end of each of said files being curved radially outward of said longitudinal axis, spring means biasing the curved ends of said files toward the longitudinal axis, guide means at one end of said body adjacent said curved ends of said files for guiding a phillipshead screwdriver into alignment between said files.
Dependencies are inferred from the claim text.