Patent ID: 9649749
Date: 2017-05-16
CPC Classifications: B24D

Claim:
1. In a non-electric manual knife sharpener having at least one pre-sharpening stage and a finishing stage, the improvement being in that the pre-sharpening stage has first abrasive sharpening structure, the finishing stage having second abrasive sharpening structure, the first abrasive sharpening structure comprising interdigitating comb-like structure, the interdigitating comb-like structure comprising two abrasive surfaced planar members fixed at an angle to each other and having interdigitating teeth which intersect and create a V-shaped abrasive surfaced trough, the first abrasive sharpening structure quickly removing material from the edge of a blade being sharpened and creating a first facet at a pre-sharpening angle, the second abrasive sharpening structure being a pair of abrasive surfaced truncated conical disks having their small ends disposed toward each other, the disks being non-slidably mounted on a freely movable rotatable shaft, the disks of the finishing stage creating a finishing angle facet larger than the first facet, and the disks having a finer abrasive surface than the abrasive surface planar members.