Multipurpose hand tool

• US 5,845,404 A
• Filed: 12/09/1996
• Issued: 12/08/1998
• Est. Priority Date: 11/07/1995
• Status: Expired due to Fees

• Current Assignee: Norman C. Jeffcoat
• Original Assignee: Norman C. Jeffcoat
• Inventors: Jeffcoat, Norman C.
• Primary Examiner(s): PAYER, HWEI SIU CHOU
• Application Number:
  US08/762,341
• Time in Patent Office: 729 Days
• Field of Search: 30/294, 30/125, 30/156, 30/278, 30/280, 30/309, 30/314, 30/317, 30/320, 30/321, 30/340, 30/342, 30/344, 30/298.4
• US Class Current: 30/125
• CPC Class Codes: B26B 1/02 with pivoted blade
• CPC Class Codes: B26B 11/006 Several functions combined in the blade
• CPC Class Codes: B26B 27/00 Hand cutting tools not provided for in the preceding groups, e.g. finger rings for cutting string, devices for cutting by means of wires
• CPC Class Codes: B26B 5/00 Hand knives with one or more detachable blades

Abstract

An ergonomically-designed, multipurpose tool including a handle, a blade with a shank and a tip, and a fastener for attaching the handle to the shank. The blade has a curved outer edge extending substantially from the shank to the tip, with, preferably, an integrally-formed gut hook positioned near the shank and opening toward the tip. A portion of the outer edge is sharpened to form a cutting edge. The fastener is user-operable for moving the blade from a first operating position where it opposes the handle to at least one next operating position, for example, extending forward of the handle for use as a hatchet. Regardless of the position of the blade, the user can control the length and direction of a cut by pivoting the wrist alone, the forearm at the elbow, the entire arm from the hand gripping the knife to the shoulder, by pushing or pulling the knife with the hand and forearm, or any combination thereof. Range of motion, dexterity and control of the cutting edge are thereby improved, with greater comfort than is possible with a conventional knife. The handle may include a compartment for storing one or more additional instruments for use therewith, such as a saw, a serrated blade, an ice pick, a fish hook, a knife blade, a file, a wrench, and a screw driver.

Claims

1. A multipurpose tool, comprising:

a set of instruments, wherein one instrument of said set is a blade having a shank, a tip, a curved inner edge, and a curved outer edge extending substantially from said shank to said tip, at least a portion of said outer edge being sharpened to form a cutting edge;

a handle having a first end, a second end, and a compartment formed therein, said compartment having an opening at said second end, said compartment dimensioned for receiving at least one instrument of said set;

fastening means operable by a user to attach a selected instrument of said set to said first end of said handle; and

means for closing said opening.

2. The multipurpose tool as recited in claim 1, wherein said fastening means further comprises means for attaching a selected instrument of said set to said handle in any one of at least two pre-selected operating positions.

3. The multipurpose tool as recited in claim 1, wherein said closing means is a plug, a threaded plug, or a cap.

4. The multipurpose tool as recited in claim 1, wherein said blade has a gut hook formed in said outer edge.

5. The multipurpose tool as recited in claim 1, wherein said set includes at least one instrument selected from the group consisting of a saw, a serrated blade, an ice pick, a fish hook, a knife blade, a file, a wrench, and a screw driver.

6. The multipurpose tool as recited in claim 1, wherein said outer edge has an approximately constant radius of curvature.

7. A knife, comprising:

a handle having a longitudinal axis, a first end and a second end; and

a blade having a shank, a tip, an inner edge, and a curved outer edge extending substantially from said shank to said tip, at least a portion of said outer edge being sharpened to form a cutting edge; and

means for attaching said handle to said shank of said blade so that said handle extends over said inner edge, said handle being spaced apart from said inner edge,

said outer edge of said blade being having a center of curvature near said longitudinal axis so that, when said handle is grasped by a user, said center of curvature is near said user'"'"'s wrist, whereby a force applied at a center of said handle directed towards said cutting edge generates an approximately uniform cutting force in a direction tangent to said cutting edge as said blade is swept through an arc.

8. The knife as recited in claim 7, wherein said outer edge has an approximately constant radius of curvature.

9. The knife as recited in claim 7, wherein said handle has a longitudinal axis, and wherein a chord between said shank and said tip forms an acute angle with said longitudinal axis.

10. The knife as recited in claim 7, further comprising a weight attached to said second end of said handle.

11. The knife as recited in claim 7, further comprising a gut hook formed in said outer edge near said shank, said gut hook opening in a direction away from said shank.

12. The knife as recited in claim 7, further comprising a prong formed in said outer edge near said shank.

13. A knife, comprising:

a handle having a first end and a second end;

a curved blade attached to said handle, said blade having a shank, a tip, an inner edge, and an outer edge extending substantially from said shank to said tip, a portion of said outer edge being sharpened to form a cutting edge, said blade having a plurality of operating positions including

a first position wherein said handle extends approximately over said inner edge, said handle being spaced apart from said inner edge, and

at least one next position; and

user-operable means for attaching said blade to said handle in a selected position of said plurality of operating positions.

14. The knife as recited in claim 13, wherein said plurality of operating positions include a second position wherein said handle extends rearward of said blade.

15. The knife as recited in claim 13, wherein said outer edge has an approximately constant radius of curvature.

16. The knife as recited in claim 13, wherein said handle has a longitudinal axis, and wherein a chord connecting said shank and said tip forms an acute angle with said longitudinal axis when said blade is in said first position.

17. The knife as recited in claim 13, further comprising a gut hook formed in said outer edge near said shank, said gut hook opening in a direction away from said shank.

18. The knife as recited in claim 13, further comprising a prong formed in said outer edge near said shank.

19. The knife as recited in claim 13, further comprising a weight attached to said second end of said handle.

20. The knife as recited in claim 13, wherein said handle has a compartment formed therein, said compartment having an opening at said second end, and wherein said knife further comprises means for closing said opening.