Title:
Broadhead point
Kind Code:
A1


Abstract:
A broadhead point for arrows having a penetrating tip and a trailing cutting portion with a plurality of projecting cutting edges and a deflector shoulder that directs air through which the penetrating tip passes rearwardly and outwardly to the outermost edges of the cutting blades, and to create an area of reduced air pressure in advance of the fixed cutting blades.



Inventors:
Roberts, Brent (American Fork, UT, US)
Roberts, Kent (American Fork, UT, US)
Application Number:
12/011763
Publication Date:
07/30/2009
Filing Date:
01/29/2008
Primary Class:
International Classes:
F42B6/08
View Patent Images:
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Primary Examiner:
YOUNG, SCOTT E
Attorney, Agent or Firm:
BRENT ROBERTS (AMERICAN FORK, UT, US)
Claims:
We claim:

1. A broadhead arrow point comprising a penetrating tip; a ferrule fixed to and projecting rearwardly of said penetrating tip; a sleeve projecting rearwardly from said ferrule; a plurality of fixed cutting blades equidistantly projecting from around said sleeve; and a shoulder fixed to said ferrule between said penetrating tip and said cutting blades, said shoulder being angled to present a surface directed from said ferrule towards a location just outside the portion of said cutting blades most remote from said sleeve.

2. A broadhead arrow point as in claim 1, wherein The penetrating top includes a plurality of smaller penetrating blades extending from a common tip end; and said fixed cutting blades being larger than said smaller penetrating blades.

3. A broadhead arrow point as in claim 2, wherein the shoulder is formed as an integral part of said ferrule.

Description:

CROSS-REFERENCE TO RELATED APPLICATIONS

Not Applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not Applicable.

REFERENCE TO MICROFICHE APPENDIX

Not Applicable.

BACKGROUND OF THE INVENTION

Field of the Invention

This invention relates to broadhead points for arrows used by archers, primarily while hunting wild game such as deer, wild boar, turkey, and the like.

It has been found that if the vanes on arrows cause the arrows to rotate during flight, increased accuracy may be achieved, along with increased flight speed. The rotating arrow acts like a bullet fired from a gun that is imparted with rotation as a result of lands and grooves within the barrel through which the bullet is propelled.

It has been found however, that when arrows with broadhead points used for hunting game are rapidly rotated, the arrows often fly off course. It has been observed that the broadhead points set up air flow patterns that may cause the flight deviation.

It has also been found that air flowing from a front penetrating tip of a broadhead point, rearwardly along the arrow, engages trailing enlarged and flared cutting blades to disturb the rotation pattern and flight of the arrow.

BRIEF SUMMARY OF THE INVENTION

Objects of the Invention

Principal objects of the present invention is to insure straight flight of a broadhead point equipped arrow that is rotating during flight.

Other objects of the invention are to provide a broadhead type arrow point that directs air past a smaller, penetrating front tip and outwardly of the outermost edges of a larger trailing set of fixed cutting blades.

Still other objects of the invention are to provide a broadhead arrow point that directs airflow from a forward tip of the point outwardly around the outermost edges of fixed trailing cutting blades such that the airflow does not adversely interfere with the air pattern established by rotating cutting blades.

Still another object is to provide a broadhead arrow point with a leading penetrating tip and a trailing section with fixed cutting blades that draft on the leading penetrating tip during arrow flight.

Features of the Invention

Principal features of the invention include a broadhead point for use with arrows that has both an initial smaller set of fixed penetrating blades and a trailing larger set of fixed cutting blades. The broadhead point includes a shoulder formed as part of a ferrule of the smaller penetrating blades. The shoulder has a surface angled to deflect air through which the penetrating blades pass, outwardly beyond the outermost edges of the trailing cutter blades. Consequently, the deflected air does not disrupt the air pattern established by the rotating arrow shaft and the larger cutting blades. This results in an arrow having a more perfectly straight flight and increased accuracy. At the same time, the deflected air causes a reduced air pressure at the front of larger cutting blades and the air currents set up by rotation of the trailing cutter blades thus causing the fixed cutting blades to draft on the penetrating tip.

Additional objects and features of the invention will become apparent to persons skilled in the art to which the invention pertains from the following detailed description, drawings and claims.

BRIEF DESCRIPTION OF THE FIGURES OF THE INVENTION

In the Drawings

FIG. 1 is a side elevation of the broadhead point of the invention;

FIG. 2, an enlarged front elevation view;

FIG. 3, a front perspective view of the broadhead point;

FIG. 4, a side elevation view showing an arrow shaft attached to the broadhead point, the arrow shaft being shown fragmentarily, and showing the flow of air past the penetrating blades and outwardly beyond the cutting blades; and

FIG. 5, a perspective view taken from above and at the rear of an arrow shaft with the broadhead point of the invention mounted thereon, and showing the vanes on the opposite end of the arrow shaft and the direction of rotation of the shaft, as well as the airflow past the penetrating blades and outwardly of the cutting blades.

DETAILED DESCRIPTION

Referring now the Drawings

In the illustrated preferred embodiment, the broadhead point of the invention, shown generally at 10, includes a forward leading small penetrating tip portion, shown generally at 12 and a trailing, larger, cutting blade portion shown generally at 14.

Penetrating tip 12 comprises fixed blades 18 with a common leading point 22. The blades 18 extend rearwardly and outwardly from the point 22 and are affixed to and project from a ferrule 26.

Ferrule 26 is cone-shaped and is flared outwardly from a small end 28 to a leading shoulder 30. Leading shoulder 30 extends outwardly and rearwardly from ferrule 26 to engage a trailing shoulder 32. Trailing shoulder 32 extends rearwardly and inwardly from shoulder 30 to engage a sleeve 34.

Multiple larger cutting blades 40 are fixed to and project equidistantly from around sleeve 34. The rearwardly extending cutting edges of the blades 40 project outwardly to a greater extent than the smaller fixed penetrating blades 18 project from ferrule 26.

Sleeve 34 is threaded, using threaded shaft 48, into or is otherwise conventionally attached to the end 42 of an arrow shaft 44. The opposite end 46 of arrow shaft 44 has a nock 50 and conventional multiple vanes 52 that will impart rotation to the arrow during flight.

As shown best in FIG. 5, air through which tip portion 12 is passed is illustrated by arrows 60. As shown, the air is directed over the tip 12 and into engagement with leading shoulder 30. Shoulder 30 is angled to direct the air shown by arrows 60 to just outside the outermost edges of the fixed cutting blades 40. Rotation of the arrow also results in a circular air flow, shown by arrows 62 as the fixed cutting blades rotate and act as paddles in the air.

The air shown by arrows 60, in flowing over shoulder 30 to outside of fixed cutting blades 40 creates an area 70 of reduced air pressure in advance of the traveling fixed cutting blades 40. The reduced pressure of area 70 allows the larger fixed vanes to “draft” behind the top 12 and shoulder 30. This reduces the air resistance otherwise encountered by the rotating fixed cutting blades and further results in increased arrow velocity and stability.

Although a preferred embodiment of our invention has been herein described, it is to be understood that the present disclosure is by way of example and that variations are possible without departing from the subject matter coming within the scope of the following claims, which subject matter we regard as our invention.