Manual sharpener

• US 9,649,749 B2
• Filed: 01/07/2016
• Issued: 05/16/2017
• Est. Priority Date: 01/16/2015
• Status: Expired due to Fees

• Current Assignee: Edgecraft Corporation (The Legacy Cos.)
• Original Assignee: Edgecraft Corporation (The Legacy Cos.)
• Inventors: Weiner, Samuel, Elek, Bela, Friel, Jr., Daniel D.
• Primary Examiner(s): ROSE, ROBERT A
• Application Number:
  US14/989,847
• Publication Number:
  US 20160207171A1
• Time in Patent Office: 495 Days
• Field of Search: 451 65, 451555, 451461, 451 45, 76 82, 76 86, 76 88
• CPC Class Codes: B24D 15/08 of knives; of razors
• CPC Class Codes: B24D 15/082 the elements being rotatable

Abstract

A manual sharpener includes at least one pre-sharpening stage having interdigitating comb-like abrasive sharpening structure. The sharpener also includes a finishing stage having a pair of abrasive surfaced truncated conical disks as its sharpening structure. The disks are mounted on a rotatable shaft with the small ends of the disks in contact with each other.

Claims

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.

2. The sharpener of claim 1 wherein the disks are press fitted onto the shaft with the small ends pressed into contact with each other.

3. The sharpener of claim 1 wherein there are two pre-sharpening stages.

4. The sharpener of claim 3 wherein the sharpening structure for one of the pre-sharpening stages disposes a blade edge at an angle between 12-18°

, and the sharpening structure for the other pre-sharpening stage disposes the blade edge at an angle of 17-23°

, and the sharpening structure in the finishing stage disposes the blade edge at an angle larger than the angles of the pre-sharpening stages.

5. The sharpener of claim 1 wherein the shaft is perpendicular to the direction of motion of the blade edge being sharpened.