Patent Application
20090191991
Not Applicable.
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Not Applicable.
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.
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.
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.
In the Drawings
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
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.
