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US 4,731,957 AGranted
Knife sharpener
OwnerMartin D. Weisingerinventor
Life of this patent
Estimating the term…
Abstract
The invention is directed to a blade sharpening device formed from two mating longitudinal body portions. An opening is provided at one end of the sharpening device from which the apex of an equilateral triangular shaped cutting blade extends into the opening. The inside corners of the opening walls and the back wall of recesses in each body portion lock the cutter blade in position and prevent movement there of when in use for sharpening. The cutter blade can be rotated to provide a new cutting edge. Extra cutter blades can be stored within the mating body portions. A thumb guard may be included.
Claims6
A blade sharpening device comprising:
- a body member comprising two longitudinal body portions which are secured together by fastening means, said body member having a handle portion at one end and two parallel spaced apart extending arms on a second end thereof:
- an equilateral triangular shaped blade extending from said body portion into an open area between said two parallel spaced apart extending arms with an apex of said cutter blade centrally positioned within said open area;
- and
- locking means for locking said cutter blades in a fixed position relative to said body member, said locking means comprising an elongated rectangular opposing slot in each of said body portions, said elongated rectangular slot extending in a direction transverse to said parallel extending arms thereby forming an opening to said slot from said open area, said cutter blade being positioned in said slot so that the surface of said slot opposite said opening and the edges of said opening lock said cutter blade in position.
1 more element
Dependencies are inferred from the claim text.