Arrowhead with removable blades

• US 4,381,866 A
• Filed: 04/01/1982
• Issued: 05/03/1983
• Est. Priority Date: 04/01/1982
• Status: Expired due to Term

• Current Assignee: Miroslav A. Simo
• Original Assignee: Miroslav A. Simo
• Inventors: Simo, Miroslav A.
• Primary Examiner(s): Shapiro, Paul E.
• Application Number:
  US06/364,499
• Time in Patent Office: 397 Days
• Field of Search: 273/422, 30/337
• US Class Current: 473/584
• CPC Class Codes: F42B 6/08 Arrow heads; Harpoon heads

Abstract

An arrowhead assembly with removable blades for attachment to the forward end of an arrow shaft for archery shooting is disclosed which provides self-aligning and self-centering of the arrowhead upon the arrow shaft. The self-aligning and self-centering is achieved by a non-deformable blade locking ring fitting over a portion of a blade carrying body, the locking ring having an undercut forward portion fitting loosely over a rearward extension of each of the blades and the rearward end of the undercut having an acute angle for forcible engagement against an angle at the rear end of each blade rearward extension. A compressible, resilient ring fits over the blade carrying body adjacent the rearward side of the non-deformable blade locking ring. A mating bevel on the blade carrying body is positioned to engage an arrow shaft insert receiving cylinder chamfer whereby upon tightening the arrowhead assembly upon the arrow shaft, the compressible ring is compressed and uneven forces by the compressible ring are accommodated by canting of the non-deformable blade locking ring thereby providing solid engagement of the mating bevel and the chamfer while tightly holding the removable blades in position.

Claims

1. An arrowhead assembly with removable blades for attachment to the forward end of an arrow shaft comprising:

a body of generally circular cross section having a forward end and a rearward end, a generally pointed nose extending from said forward end and said rearward end having fastening means for securement to said forward end of an arrow shaft, said body having a shoulder portion at the forward end of said fastening means, said body having multiple radial slots along its long axis for receiving said removable blades, said slots terminating in an acute angle stop at their forward end in the region of said nose and extending into said shoulder portion at their rearward end;

a non-deformable blade locking ring fitting over said shoulder portion of said body, said locking ring having an undercut forward portion spacing the forward portion of said ring outwardly from said shoulder, the rearward end of said undercut forming an acute angle to the axis of said ring;

a compressible ring fitting over said shoulder of said body adjacent the rearward side of said locking ring and adjacent the forward end of said arrow shaft, said compressible ring being in compressed condition when said arrowhead assembly is installed on said arrow shaft; and

multiple blades having a shape exterior to said arrowhead body adapted for good aerodynamic flight characteristics and deep target penetration, said blades having an acute angle at their forward ends to mate against said acute angle stop and having an extension at their rearward ends to mate within said non-deformable locking ring undercut portion and an acute angled end to mate against said angle at the rearward end of said undercut.

2. The arrowhead assembly of claim 1 having 2 to 7 said blades.

3. The arrowhead assembly of claim 1 having 3 to 5 said blades.

4. The arrowhead assembly of claim 1 wherein said pointed nose is a separate piece fastened to the forward end of said body, said acute angle stop comprising the rearward end of said separate pointed nose.

5. The arrowhead assembly of claim 1 wherein said acute angle of said stop and blade forward end is about 30°

to about 70°

to the axis of the arrowhead.

6. The arrowhead assembly of claim 1 wherein said acute angle of said stop and blade forward end is about 40°

to about 50°

to the axis of the arrowhead.

7. The arrowhead assembly of claim 1 wherein said angle of said rearward end of said undercut and said blade extension acute angled end is about 30°

to about 70°

to the axis of the arrowhead.

8. The arrowhead assembly of claim 1 wherein said angle of said rearward end of said undercut and said blade extension acute angled end is about 40°

to about 50°

to the axis of the arrowhead.

9. The arrowhead assembly of claim 1 wherein the forward side of said non-deformable blade locking ring is spaced rearwardly from the forward end of said shoulder portion and the trailing edge of said blades.

10. The arrowhead assembly of claim 9 wherein said undercut portion of said non-deformable blade locking ring is spaced outwardly from said blade extensions at the rearward ends of said blades.

11. The arrowhead assembly of claim 1 wherein said fastening means at the rearward end of said body comprises a threaded shaft portion mating with internal threads of an insert in said forward end of said arrow shaft.

12. The arrowhead assembly of claim 11 wherein the rearward end of said shoulder comprises an angular portion for mating with a chamfer at the forward end of said insert.

13. The arrowhead assembly of claim 12 wherein said angular portion and said chamfer forms an angle of about 30°

to about 70°

to the axis of said arrow.

14. The arrowhead assembly of claim 12 wherein said angular portion and said chamfer forms an angle of about 40°

to about 50°

to the axis of said arrow.

15. The arrowhead assembly of claim 1 wherein said compressible ring in said compressed condition has an outer diameter about the same as the diameter of said arrow shaft and said non-deformable ring.

16. The arrowhead assembly of claim 1 wherein said compressible ring is made of a material selected from the group consisting of rubber and resilient synthetic polymers.

17. The arrowhead assembly of claim 1 wherein said blades comprise metal sheets having sharpened leading edges and at least one cutout portion.

18. The arrowhead assembly of claim 17 wherein said blades have multiple cut out portions in the area of the blade exterior to said body.

19. The arrowhead assembly of claim 1 wherein said blades have an extreme outside diameter of about 1 to about 2 inches.

20. The arrowhead assembly of claim 1 wherein said blades have an extreme outside diameter of about 11/2 to about 2 inches.

21. The arrowhead assembly of claim 1 wherein said acute angle of said stop and blade forward end is about 30°

to about 70°

to the axis of the arrowhead;

said angle of said rearward end of said undercut and said blade extension acute angled end is about 30°

to about 70°

to the axis of the arrowhead;

the forward side of said non-deformable blade locking ring is spaced rearwardly from the forward end of said shoulder portion and the trailing edge of said blades and said undercut portion of said non-deformable blade locking ring is spaced outwardly from said blade extensions at the rearward ends of said blades; and

the rearward end of said shoulder comprises an angular portion for mating with a chamfer in said insert and said angular portion and said chamfer forms an angle of about 30°

to about 70°

to the axis of said arrow.

22. In a self-aligning and self-centering arrowhead assembly having removable blades fitting in radial slots along the long axis of a blade carrying body and attached to an arrow shaft insert having a chamfer within a receiving cylinder, a self-aligning, self-centering means comprising:

a non-deformable blade locking ring fitting over a portion of said blade carrying body, said locking ring having an undercut forward portion fitting loosely over a rearward extension of each of said blades, the rearward end of said undercut having an acute angle for forcible engagement against an angle at the rear end of said blade rearward extension;

a compressible, resilient ring fitting over said blade carrying body adjacent the rearward side of said non-deformable blade locking ring;

a mating bevel on said blade carrying body positioned to engage said arrow shaft insert receiving cylinder chamfer and compressing said compressible ring upon such engagement whereby uneven forces by compressible ring are accommodated by canting of said non-deformable blade locking ring thereby providing solid engagement of said mating bevel and said chamfer.

23. In the arrowhead assembly of claim 22 wherein said angle of said rearward end of said undercut and said blade extension acute angled end is about 30°

to about 70°

to the axis of the arrowhead.

24. In the arrowhead assembly of claim 22 wherein said angle of said rearward end of said undercut and said blade extension acute angled end is about 40°

to about 50°

to the axis of the arrowhead.

25. In the arrowhead assembly of claim 22 wherein the forward side of said non-deformable blade locking ring is spaced rearwardly from any outwardly extending shoulder portion and the trailing edge of said blades.

26. In the arrowhead assembly of claim 25 wherein said undercut portion of said non-deformable blade locking ring is spaced outwardly from said blade extensions at the rearward ends of said blades.

27. In the arrowhead assembly of claim 22 wherein said mating bevel and said chamfer forms an angle of about 30°

to about 70°

to the axis of said arrow.

28. In the arrowhead assembly of claim 27 wherein said mating bevel and said chamfer forms an angle of about 40°

to about 50°

to the axis of said arrow.