# US 2019/0224801 A1 · Knife and tool sharpener

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- Number: US 2019/0224801 A1
- Document ID: US20190224801A1
- Status: Published application
- Kind: A1
- Application number: 16/251,948
- Filed: 2019-01-18
- Published: 2019-07-25
- Earliest claimed: 2018-01-19
- Assignees: Edgecraft Corporation
- Applicants: EdgeCraft Corporation
- Inventors: Bela Elek; Bill Hessler; George Jensen
- Web page: https://patentgrep.com/patent/US20190224801A1

## CPC

- B24B 3/54: of hand or table knives
- B24B 3/52: of shear blades or scissors
- B24B 23/02: with rotating grinding tools; Accessories therefor
- B24B 23/08: Portable grinding machines designed for fastening on workpieces or other parts of particular section, e.g. for grinding commutators
- B24B 47/12: by mechanical gearing or electric power (B24B47/16 takes precedence)
- B25F 3/00: Associations of tools for different working operations with one portable power-drive means; Adapters therefor
- B26D 7/12: by sharpening the cutting member
- B25F 5/02: Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)}
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}
- B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04)

## Abstract

A sharpening tool having a handle having a variable speed switch and a support grip, a removable universal tool adapter rotatably coupled to the handle, a locking feature for locking a position of the removable universal tool adapter, and a motor for driving a tool coupled to the removable universal tool adapter.

## Claims

### Claim 1

A sharpening tool comprising:
a housing;
a first handle disposed on the housing;
an electric motor disposed within the housing, the electric motor configured to rotate a driveshaft;
an electric power input;
a switch disposed on the housing, the switch selectable to operate the electric motor using the electric power input;
an accessory attachment point on the housing; and
a sharpening accessory configured to be reversibly coupled to the accessory attachment point, the sharpening accessory coupled the driveshaft to translate rotation of the driveshaft to rotation of a first disk having a first sharpening surface thereon when the sharpening accessory is coupled to the accessory attachment point.

### Claim 2 (depends on 1)

The sharpening tool of claim 1, wherein the first handle is formed as an integral portion of the housing.

### Claim 3 (depends on 1)

The sharpening tool of claim 1, further comprising a second handle projecting from a single point of the housing.

### Claim 4 (depends on 1)

The sharpening tool of claim 1, wherein the switch is a variable speed switch configured to operate the electric motor at a plurality of speeds and rotate the driveshaft at a plurality of speeds.

### Claim 5 (depends on 1)

The sharpening tool of claim 1, wherein the electric power input includes an electric cord configured to electrically couple the sharpening tool to an electric power system.

### Claim 6 (depends on 1)

The sharpening tool of claim 1, wherein the electric power input includes a rechargeable battery.

### Claim 7 (depends on 1)

The sharpening tool of claim 1, wherein the sharpening accessory is a first sharpening accessory including:
a first accessory housing;
a first translation shaft disposed within the first accessory housing, the first disk coupled to the first translation shaft, the first translation shaft coupled to the driveshaft to translate rotation of the driveshaft to rotation of the first disk when the first sharpening accessory is coupled to the accessory attachment point;
a first aperture formed in the first accessory housing, a portion of the first sharpening surface of the first disk disposed within the first aperture; and
a first resilient member disposed on the first accessory housing proximate the first aperture, the first resilient member configured to bias a tool edge against the first sharpening surface of the first disk when the tool edge is disposed within the first aperture.

### Claim 8 (depends on 7)

The sharpening tool of claim 7, further comprising:
a second disk coupled to the first translation shaft, the second disk having a second sharpening surface thereon;
a second aperture formed in the first accessory housing, a portion of the second sharpening surface of the second disk disposed within the second aperture; and
a second resilient member disposed on the first accessory housing proximate the second aperture, the second resilient member configured to bias a tool edge against the second sharpening surface of the second disk when the tool edge is disposed within the second aperture.

### Claim 9 (depends on 8)

The sharpening tool of claim 8, wherein the first sharpening surface and the second sharpening surface have different sharpening characteristics.

### Claim 10 (depends on 7)

The sharpening tool of claim 7, further comprising a compression spring biasing movement of the first disk along a rotation axis of the first translation shaft.

### Claim 11 (depends on 1)

The sharpening tool of claim 1, wherein the sharpening accessory is a second sharpening accessory including:
a second accessory housing;
a second disk having a second sharpening surface thereon;
a second translation shaft disposed within the second accessory housing, the first disk and the second disk coupled to the second translation shaft, the second translation shaft coupled to the driveshaft to translate rotation of the driveshaft to rotation of the first disk and the second disk when the second sharpening accessory is coupled to the accessory attachment point;
a first angled notch formed in the second accessory housing, a portion of the first sharpening surface of the first disk disposed within the first angled notch, the first angled notch providing a first bevel angle for a first side of a tool edge disposed therein;
a second angled notch formed in the second accessory housing, a portion of the second sharpening surface of the second disk disposed within the second angled notch, the second angled notch providing a second bevel angle for a second side of a tool edge disposed therein.

### Claim 12 (depends on 11)

The sharpening tool of claim 11, wherein a portion of the second accessory housing between the first angled notch and the second angled notch includes a resilient member having a first resilient portion and a second resilient portion, the first resilient portion configured to bias the first side of the tool edge against the first sharpening surface of the first disk, and the second resilient portion configured to bias the second side of the tool edge against the second sharpening surface of the second disk.

### Claim 13 (depends on 11)

The sharpening tool of claim 11, wherein a portion of the second accessory housing between the first angled notch and the second angled notch is removable.

### Claim 14 (depends on 11)

The sharpening tool of claim 11, further comprising a compression spring biasing movement of the first disk and the second disk along a rotation axis of the second translation shaft.

### Claim 15 (depends on 11)

The sharpening tool of claim 11, further comprising:
a third angled notch formed in the second accessory housing, a portion of the first sharpening surface of the first disk disposed within the third angled notch, the third angled notch providing a third bevel angle for the first side of a tool edge disposed therein;
a fourth angled notch formed in the second accessory housing, a portion of the second sharpening surface of the second disk disposed within the fourth angled notch, the fourth angled notch providing a fourth bevel angle for a second side of a tool edge disposed therein;
wherein:
a portion of the second accessory housing between the first angled notch and the second angled notch includes a resilient member having a first resilient portion and a second resilient portion, the first resilient portion configured to bias the first side of the tool edge against the first sharpening surface of the first disk, and the second resilient portion configured to bias the second side of the tool edge against the second sharpening surface of the second disk; and
a portion of the second accessory housing between the third angled notch and the fourth angled notch is removable.

### Claim 16 (depends on 11)

The sharpening tool of claim 11, further comprising:
a third disk having a third sharpening surface thereon;
a fourth disk having a fourth sharpening surface thereon, the third disk and the fourth disk coupled to the second translation shaft, the second translation shaft coupled to the driveshaft to translate rotation of the driveshaft to rotation of the third disk and the fourth disk when the second sharpening accessory is coupled to the accessory attachment point;
a third angled notch formed in the second accessory housing, a portion of the third sharpening surface of the third disk disposed within the third angled notch, the third angled notch providing a third bevel angle for a first side of a tool edge disposed therein;
a fourth angled notch formed in the second accessory housing, a portion of the fourth sharpening surface of the fourth disk disposed within the fourth angled notch, the fourth angled notch providing a fourth bevel angle for a second side of a tool edge disposed therein.

### Claim 17 (depends on 16)

The sharpening tool of claim 16, wherein the first sharpening surface and the second sharpening surface have different sharpening characteristics from the third sharpening surface and the fourth sharpening surface.

### Claim 18 (depends on 1)

The sharpening tool of claim 1, wherein the sharpening accessory is a third sharpening accessory including:
a third accessory housing;
a chuck, the first disk reversibly coupled to the chuck;
a third translation shaft disposed within the third accessory housing, the third translation shaft coupling the driveshaft to the chuck to translate rotation of the driveshaft to rotation of the first disk when the third sharpening accessory is coupled to the accessory attachment point.

### Claim 19 (depends on 18)

The sharpening tool of claim 18, wherein the first sharpening surface is convex.

### Claim 20

A sharpening tool kit comprising:
a sharpening tool including:
a housing;
a first handle disposed on the housing;
an electric motor disposed within the housing, the electric motor configured to rotate a driveshaft;
an electric power input;
a switch disposed on the housing, the switch selectable to operate the electric motor using the electric power input; and
an accessory attachment point on the housing;
at least two members of a group consisting of: a first sharpening accessory, a second sharpening accessory, and a third sharpening accessory, wherein each sharpening accessory is configured to be reversibly coupled to the accessory attachment point;
wherein:
the first sharpening accessory includes:
a first accessory housing;
a first translation shaft disposed within the first accessory housing, the first disk coupled to the first translation shaft, the first translation shaft coupled to the driveshaft to translate rotation of the driveshaft to rotation of the first disk when the first sharpening accessory is coupled to the accessory attachment point;
a first aperture formed in the first accessory housing, a portion of the first sharpening surface of the first disk disposed within the first aperture; and
a first resilient member disposed on the first accessory housing proximate the first aperture, the first resilient member configured to bias a tool edge against the first sharpening surface of the first disk when the tool edge is disposed within the first aperture;
the second sharpening accessory includes:
a second accessory housing;
a second disk having a second sharpening surface thereon;
a second translation shaft disposed within the second accessory housing, the first disk and the second disk coupled to the second translation shaft, the second translation shaft coupled to the driveshaft to translate rotation of the driveshaft to rotation of the first disk and the second disk when the second sharpening accessory is coupled to the accessory attachment point;
a first angled notch formed in the second accessory housing, a portion of the first sharpening surface of the first disk disposed within the first angled notch, the first angled notch providing a first bevel angle for a first side of a tool edge disposed therein;
a second angled notch formed in the second accessory housing, a portion of the second sharpening surface of the second disk disposed within the second angled notch, the second angled notch providing a second bevel angle for a second side of a tool edge disposed therein; and
the third sharpening accessory includes:
a third accessory housing;
a chuck, the first disk reversibly coupled to the chuck;
a third translation shaft disposed within the third accessory housing, the third translation shaft coupling the driveshaft to the chuck to translate rotation of the driveshaft to rotation of the first disk when the third sharpening accessory is coupled to the accessory attachment point.

### Claim 21 (depends on 21)

The sharpening tool kit of claim 21, wherein the kit includes the first sharpening accessory, the second sharpening accessory, and the third sharpening accessory.