Blade sharpener

• US 6,039,642 A
• Filed: 09/15/1998
• Issued: 03/21/2000
• Est. Priority Date: 09/15/1998
• Status: Expired due to Fees

• Current Assignee: Walter W. Collins
• Original Assignee: Walter W. Collins
• Inventors: Collins, Walter W.
• Primary Examiner(s): Scherbel, David A.
• Assistant Examiner(s): OJINI, EZIAMARA ANTHONY
• Application Number:
  US09/153,163
• Time in Patent Office: 553 Days
• Field of Search: 451/557, 451/45, 451/549, 76/86-89
• US Class Current: 451/557
• CPC Class Codes: B24D 15/06 specially designed for sharpening cutting edges
• CPC Class Codes: B24D 15/082 the elements being rotatable

Abstract

A blade sharpener having a magazine slidably carried within a sleeve. The magazine contains two sets of three sharpening wheels carried for rotation within the magazine, which are positioned in a staggered relationship with respect to one another, such that each set of three sharpening wheels forms two sharpening interfaces. Two channels are defined in the magazine and are generally in alignment with each of the two sharpening interfaces. The magazine is movable with respect to the sleeve, and may be selectively fixed in at least three positions relative thereto with a spring-biased pushbutton. For storage or transport, the magazine is moved into the sleeve such that both sets of the sharpening wheels are housed within the sleeve. The magazine of the blade sharpener is also provided with an elongated sharpening rod which is pivotally connected to the magazine, and which is used to sharpen serrated blades.

Claims

1. A sharpener for a blade, comprising:

an elongated body member;

at least two sharpening wheels mounted for rotation on said body member;

a portion of each of said two sharpening wheels overlapping one another to define a first sharpening interface adapted for receiving the blade;

each of said sharpening wheels being of a generally frusto-conical shape and having a base portion and a top portion opposite said base portion, said base portion being of larger diameter than said top portion; and

said base portion of each of said sharpening wheels facing an adjacent sharpening wheel.

2. A sharpener as defined in claim 1, further comprising a sleeve member defining a passage for sliding receipt of said body member;

and said sleeve member being configured for covering said two sharpening wheels upon said body member being inserted in said passage.

3. A sharpener as defined in claim 1, further comprising said at least two sharpening wheels including first, second, and third sharpening wheels;

said first and second sharpening wheels defining said first sharpening interface and said second and third sharpening wheels defining a second sharpening interface.

4. A sharpener as defined in claim 1, further comprising a sharpening rod attached to and extending outwardly from said body member.

5. A sharpener as defined in claim 4, wherein said sharpening rod is generally conical in shape.

6. A sharpener as defined in claim 4, wherein said sharpening rod includes a fusion-welded tungsten carbide coating.

7. A sharpener as defined in claim 4, wherein:

said body member defines an elongated recess; and

said sharpening rod is pivotally attached to said body member and is movable between a retracted position within said elongated recess and an extended position extending outwardly from said body member.

8. A sharpener as defined in claim 1, further comprising:

a sleeve member defining a passage for sliding receipt of said body member;

said sleeve member being configured for covering said two sharpening wheels upon said body member being inserted in said passage; and

a releasable fastener connected to said body member for selectively fixing said body member with respect to said sleeve member.

9. A sharpener as defined in claim 8, wherein said sleeve member defines a plurality of openings therein and wherein said releasable fastener is a spring-biased pushbutton carried on said body member.

10. A sharpener as defined in claim 1, further comprising at least two generally cylindrical sharpening wheels mounted for rotation on said body member;

a portion of each of said generally cylindrical sharpening wheels overlapping one another to define a second sharpening interface.

11. A sharpener as defined in claim 8, further comprising said two generally cylindrical sharpening wheels including first, second, and third generally cylindrical sharpening wheels;

said first and second generally cylindrical sharpening wheels defining said second sharpening interface and said second and third generally cylindrical sharpening wheels defining a third sharpening interface.

12. A sharpener as defined in claim 10, wherein said two generally cylindrical sharpening wheels are ceramic.

13. A sharpener as defined in claim 1, wherein said two sharpening wheels are tungsten carbide.

14. A method of sharpening a blade, comprising:

providing an elongated body member having three frusto-conically-shaped coarse sharpening wheels defining first and second coarse sharpening interfaces and three generally cylindrical finish sharpening wheels defining first and second finish sharpening interfaces;

drawing the blade through said first and then said second coarse sharpening interfaces; and

then, drawing the blade through said first and then said second finish sharpening interfaces.

15. The method defined in claim 14, further comprising:

providing an elongated sharpening rod on said body member; and

drawing said sharpening rod along said blade.

16. A sharpener for a blade, comprising:

an elongated body member;

first, second, and third coarse sharpening wheels mounted for rotation on said body member;

said first and second coarse sharpening wheels defining said first coarse sharpening interface and said second and third coarse sharpening wheels defining a second coarse sharpening interface; and

said first and second coarse sharpening interfaces being adapted for receiving the blade; and

first, second, and third finish sharpening wheels mounted for rotation on said body member;

said first and second finish sharpening wheels defining said first finish sharpening interface and said second and third finish sharpening wheels defining a second finish sharpening interface; and

said first and second finish sharpening interfaces being adapted for receiving the blade.

17. The sharpener as defined in claim 16, wherein each of said first, second and third coarse sharpening wheels are of a generally frusto-conical shape and have a base portion and a top portion opposite said base portion, said base portion being of larger diameter than said top portion;

and said base portion of said first, second, and third coarse sharpening wheels being adjacent to one another.

18. The sharpener as defined in claim 16, wherein said first, second and third finish sharpening wheels are of generally cylindrical shape.