Sharpener for thick knives
First Claim
1. In a knife sharpener having at least one sharpening stage with guide structure in the stage, the guide structure comprising a fixed guide surface and a spring having a guide surface forming a slot, the slot having an upper end and a lower end to guide a knife blade against a sharpening member, the improvement being in that the fixed guide surface has a non-planar portion for being disposed at a hollow ground portion of a thick blade, the non-planar portion being formed by the fixed guide surface having an upper segment at the upper end of the slot, the upper segment merging into an intermediate segment which merges into a lower segment, the intermediate segment extending from the upper segment in a direction away from the spring guide surface and then in a direction toward the spring guide surface to merge with the lower segment, the lower segment being at the lower end of the slot near the sharpening member, and the spring guide surface having a portion to press against a hollow ground portion of the opposite side of the blade.
4 Assignments
0 Petitions
Accused Products
Abstract
A knife sharpener includes guide structure for accommodating thick blades of a knife. The guide structure includes a fixed guide surface having a convex portion to match a concave shape of the blade and a spring guide surface preferably has a convex portion to press against a hollow ground portion of the blade.
57 Citations
20 Claims
- 1. In a knife sharpener having at least one sharpening stage with guide structure in the stage, the guide structure comprising a fixed guide surface and a spring having a guide surface forming a slot, the slot having an upper end and a lower end to guide a knife blade against a sharpening member, the improvement being in that the fixed guide surface has a non-planar portion for being disposed at a hollow ground portion of a thick blade, the non-planar portion being formed by the fixed guide surface having an upper segment at the upper end of the slot, the upper segment merging into an intermediate segment which merges into a lower segment, the intermediate segment extending from the upper segment in a direction away from the spring guide surface and then in a direction toward the spring guide surface to merge with the lower segment, the lower segment being at the lower end of the slot near the sharpening member, and the spring guide surface having a portion to press against a hollow ground portion of the opposite side of the blade.
Specification