Patent Grant
8523718
This invention relates to archery arrow vanes, and more particularly to arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, which improves flight characteristics over traditionally manufactured, configured and/or applied vanes.
In order to increase rotation of an arrow in flight, vanes have been attached at helical and/or offset orientations to the arrow shaft. However, due to decreased spacing between the vanes, the helical and offset mounted vanes often interfere with the arrow rest of the bow when the arrow is being shot. This interference is known to cause the arrow to change direction after it is shot and can result in the arrow wobbling during flight, which can result in poor target accuracy and shorter flight distance. See for example, U.S. Pat. No. 4,867,426 to Mellick.
Additionally, helically oriented and off-set oriented vanes present a similar problem when shot down a rigid, planarcrossbow arrow track. The rigid, planar track, will not physically allow the passage of these helically oriented and off-set oriented vanes as the vanes interfere with the planar nature of the crossbow arrow track which is a machined or molded track in which the arrow vane is slipped and the arrow can miss its' target.
Various types of arrow vanes have been proposed over the years to deal with these problems. See for example, U.S. Pat. No. 6,142,896 to Simo and U.S. Patent Application Publication 2005/0159256 to Simo et al.
However, these vanes are generally flat planar vanes with little or no curved aerodynamic surface. These previous vanes are planar and have molded “kickers” that are supposed to serve as an airfoil and induce longitudinal spin-stabilization. The “airfoil” portion of these flat, planar vanes is in the aft end. The “kicker” used in these references is a very low-efficiency protuberance. It relies on aerodynamic drag to induce spin-stabilization, slowing the arrow's speeds.
However, these products have not been commercially successful due to the planar surface. During flight, these planar vanes with molded kickers and “airfoil” shapes flex and then flutter uncontrollably during flight due to the great amount of turbulent airflow over their surfaces. These modified vanes, which increase aerodynamic drag exponentially, slow the arrow and result in less than desirable results.
The subject inventor patented U.S. Pat. No. 6,695,727, which included an arrow vane device that requires a pre-assembled vane arrangement on an arrow shaft to be screwably attached to shaft. The problem here is that most arrows do not allow for a separate attachment shaft with vane. So this prior art would not be useful to be used with most existing arrows.
This patent described the use of molded vanes that had a strictly planar foot section. These airfoil equipped vanes were manufactured by a molding process. Unlike the present invention that utilizes any commercially available arrow vane (planar) to form a three-dimensional airfoil by physically wrapping the foot section around the arrow shaft causing the vane to mold itself into a three-dimensional airfoil.
Thus, there exists the need for solutions to the problems addressed in the prior art.
A primary objective of the present invention is to provide arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, which improves flight characteristics over traditionally manufactured, configured and/or applied vanes.
A secondary objective of the present invention is to provide arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, which allows the user to apply any commercially available flat, planar vane in a manner which converts the flat planar vanes into a three-dimensional airfoil type vane that provides laminar airflow across the vane surfaces, resulting in a spin-stabilized flight of said projectile (arrow).
A third objective of the present invention is to provide arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, with a three-dimensional airfoil shape that provides aerodynamic lift to said arrow (i.e., projectile) resulting increased trajectories (i.e., the arrow remain aloft longer than traditionally arranged vanes which result in aerodynamic drag across their vane surfaces).
A fourth objective of the present invention is to provide arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, having a compound bending of the planar vane, and resulting airfoil, which provides structural rigidity to the said vane, eliminating fluttering during flight, and resulting in increased arrow speeds and increased accuracy.
A fifth objective of the present invention is to provide arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, having a design with a very diminutive profile, with regard to the longitudinal axis of the arrow shaft, which allows the said vane to be shot down a crossbow track without interference.
A sixth objective of the present invention is to provide arrow vanes, devices and methods for improving arrow vane airfoils for compound arrows, crossbow arrows and traditional arrows, having the only arrow vane configuration which allows for spin-stabilization of crossbow arrows (sometimes referred to as “crossbow bolts”).
The present invention utilizes a three-dimensional airfoil that is formed when the planar vanes is wrapped around the arrow shaft, causing the planar vane to form an airfoil along its length (or a portion of said length). The amount (degree) of airfoil is determined by the amount of vane that is “wrapped” around the arrow shaft. The current invention utilizes laminar air flow across the vane and airfoil surface to induce spin stabilization. Faster arrows speeds are achieved due to the lack of aerodynamic drag.
An arrow vane configuration, can include an arrow shaft having a tip end and a nock end, a plurality of compound bent aerodynamic vanes, each having a base, and mounts for mounting the bases of the compound bent aerodynamic vanes on the shaft, wherein the mounts form three dimensional airfoil vanes from the compound bent aerodynamic vanes, in order to provide for spin stabilized flights of an arrow having the three dimensional airfoil vanes.
The bases of the compound bent aerodynamic vanes can include both a generally straight portion and a bent portion. The bent portion can have a right helical pattern. The bent portion can have a left helical pattern.
The generally straight portion can be up to approximately 1 to approximately 3 degrees off center, and the bent portion can be approximately 1 to approximately 20 degrees off center, so that the bent portion is more off-center than the generally straight portion.
The mounts can include a fletching clamp having a channel for supporting and clamping a vane therein, the channel having a generally straight portion and a generally bent portion. The bent portion can have a right helical pattern. The bent portion can have a left helical pattern. The generally straight portion can be up to approximately 1 to approximately 3 degrees off center, and the bent portion can be approximately 1 to approximately 20 degrees off center, so that the bent portion is more off-center than the generally straight portion.
The arrow can be a crossbow arrow. The arrow can be a compound arrow. The arrow can be a traditional arrow made of wood or similar materials known to those familiar with the prior art.
A method of providing spin stabilization to an arrow, can include the steps of providing an arrow with an arrow shaft having a tip end and a nock end, providing a plurality of planar vanes, compound bending each of the planar vanes to the sides of the arrow shaft adjacent to the nock end to provide rigidity to the vanes, and increasing arrow speeds and increased accuracy and reducing fluttering when the arrow is shot from a bow.
The compound bending step can includes the step of mounting a front base portion of the planar vanes to the arrow shaft in a generally straight orientation, and mounting a rear base portion of the of the planar vanes to the arrow shaft in a bent orientation. The bent portion can include a right helical orientation. The bent portion can include a left helical orientation.
The compound bending step can include the steps of preforming a front base portion of the planar vanes in a generally straight orientation, and preforming a rear base portion of the of the planar vanes in a bent orientation. The preforming steps can include the step of compressing base portions of the vanes in a clamp having a generally straight channel and a generally bent channel.
Further objects and advantages of this invention will be apparent from the following detailed description of the presently preferred embodiments which are illustrated schematically in the accompanying drawings.
Before explaining the disclosed embodiments of the present invention in detail it is to be understood that the invention is not limited in its applications to the details of the particular arrangements shown since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation.
The components labeled in the figures are listed below.
The current invention allows the user to apply any commercially available flat, planar vane in a manner which converts the flat planar vanes into a three-dimensional airfoil type vane. By applying the vane in a prescribed manner in the current invention, the flat, planar vanes, are now converted to a three-dimensional airfoil, which implies laminar airflow across the vane surfaces, resulting in a spin-stabilized flight of said projectile (arrow). This three-dimensional airfoil shape provides aerodynamic lift to said arrow (i.e., projectile) resulting in increased trajectories (i.e., the arrow remain aloft longer than traditionally arranged vanes which result in aerodynamic drag across their vane surfaces).
The current invention is novel in that allows a novel application of a planar vane onto a round arrow shaft, causing said planar vane to become three-dimensional.
The current invention, with its compound bending of the planar vane, and resulting airfoil, provides rigidity to the said vane, limiting fluttering dramatically during flight. Resulting in increased arrow speeds and increased accuracy.
The current design, additionally, with its very diminutive profile, with regard to the longitudinal axis of the arrow shaft, allows the said vane to be shot down a crossbow track without interference.
The subject invention, is the only arrow vane configuration which allows for spin-stabilization of crossbow arrows (sometimes referred to as “crossbow bolts”).
Referring to
To convert a normal flat, planar vanes to an airfoil, the fletching jig 200 (the mechanical apparatus that applies the vane, or “mounts” the vane to the arrow shaft), actually bends that planar vanes “around” the circumference of the arrow shaft.
Referring to
In the subject invention, the plastic vane is pliable enough to be bent into different twisted orientations. For example, as the vane is bent around the round arrow shaft, it forms a three-dimensional airfoil.
As shown in
As shown in the Mellick '426 patent, only a continuous helical vane orientation as shown in
The novel fletching jig 200 “bends” or “contours” the arrow vane “around” the arrow shaft 10. The fletching jig is designed to apply the arrow vanes “around” the circumference of the arrow shaft. As the vane is bent, it forms a three dimensional airfoil. No one specific geometry (“bend”) works for every application. Any number of airfoil shapes can work. The difference is the amount of aerodynamic lift produced by the different shapes.
Although the preferred embodiments reference vanes for various types of arrows, the invention can be applicable with other types of projectiles that are to be launched, such as but not limited to darts, missiles, crossbows, blow guns, spear guns, toy weapons, and the like.
While the invention has been described, disclosed, illustrated and shown in various terms of certain embodiments or modifications which it has presumed in practice, the scope of the invention is not intended to be, nor should it be deemed to be, limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved especially as they fall within the breadth and scope of the claims here appended.
| Number | Name | Date | Kind |
|---|---|---|---|
| 4867426 | Mellick | Sep 1989 | A |
| 5039110 | Honda | Aug 1991 | A |
| 5846147 | Basik | Dec 1998 | A |
| 6142896 | Simo | Nov 2000 | A |
| 6695727 | Kuhn | Feb 2004 | B1 |
| 8105189 | Huang | Jan 2012 | B1 |
| 20050159256 | Simo | Jul 2005 | A1 |
