Games using tangible projectile – Projectile – per se; part thereof or accessory therefor – Arrow – dart – or shuttlecock; part thereof
Reexamination Certificate
1998-06-08
2002-08-06
Ricci, John A. (Department: 3712)
Games using tangible projectile
Projectile, per se; part thereof or accessory therefor
Arrow, dart, or shuttlecock; part thereof
Reexamination Certificate
active
06428433
ABSTRACT:
BACKGROUND
1. Field of the Invention
This invention relates generally to the forward leading end point of arrowheads or arrowhead tips, and more particularly to removably attachable arrowhead tips that may be selectively aligned in specific orientation with structures of their corresponding arrowhead bodies, such as specifically aligning cutting edges of arrowhead tip facet junctures with the cutting blades of the arrowhead.
2. Description of Prior Art
Arrows have long been used for war, hunting and competitive sports. A conventional arrow has a shaft, a nock at one end that receives the bow string, an arrowhead or point that attaches to the opposite end, and fletchings. The fletchings are glued to the shaft near the nock end, and help to stabilize the arrow in flight, as it rotates. Arrowheads generally have a pointed forward end, and an opposite threaded shaft end that attaches the arrowhead to the arrow shaft. Arrowheads are also attached to the forward end of arrow shafts by glueing and other methods.
Arrowheads come in a variety of different sizes and configurations depending on their intended use. For example, there are specifically designed arrowheads for competitive target shooting, shooting fish, hunting birds or small game animals, and for hunting big game animals.
The most common type of arrowhead used in hunting is the fixed-blade arrowhead, which has a pointed tip end used for penetrating, and fixed blades or non-pivotal blades that each have a razor sharp edge for cutting. Conventional fixed-blade arrowheads blades are held in a fixed position on the arrowhead, and most such blades are replaceable. The replaceable blades attach to the arrowhead body in longitudinal grooves called blade slots. The tip of the arrowhead may be separably attachable to the arrowhead body or may be integral with it. Arrowheads for hunting are generally known as broadheads.
Another popular type of arrowhead for hunting is the blade-opening arrowhead. Blade-opening arrowheads, like conventional fixed-blade arrowheads generally have an elongated arrowhead body, a tip end, and a threaded opposite end. The blades of blade-opening arrowheads have an attachment end which attaches the blades to the arrowhead body by a pivot pin, so that the blades can pivot or rotate in a plane between a first selectable position—the retracted position, and a second selectable position—the open position. Blade-opening arrowheads also come in a variety of different types and styles. The blades of the most common type of blade-opening arrowheads, when in the retracted position have a leading blade end positioned near the tip of the arrowhead that protrudes outward from the arrowhead body. The leading blade ends of such blade-opening arrowheads, rotate away from the arrowhead body in a rearward direction when penetrating an animal. Particularly, the leading blade ends catch on the animal's surface and serve to lever or rotate the blades into the open position, thus exposing the sharp cutting edges of the blades and cutting the animal. The blades of blade-opening arrowheads are also received in blade slots, which are machined or formed into the side of the arrowhead body.
Broadheads kill game animals by cutting vital organs such as the lungs and vascular vessels such as arteries, which causes rapid hemorrhaging and/or suffocation. Quick and humane kills are dependent on accurate shot placement, and upon the amount or volume of the animal tissue that is cut. Hunting arrowheads that cut more tissue are more lethal, and therefore are better. The volume of tissue that is cut is determined by the cutting diameter of the arrowhead, the number of blades it contains, and by the distance the arrowhead penetrates into the animal. The cutting diameter of an arrowhead is determined by how far each cutting blade extends outward from the arrowhead body. The further the blades extend outward the larger the cutting diameter is, and therefore the more cutting potential the arrowhead has.
The forward end or tip of most broadheads have a chisel type tip such as the three sided hollow ground trocar tip. The chisel tips generally have multiple sides or facets with a cutting edge formed at the juncture of each two facets. Typically there is the same number of cutting edges on the arrowhead tip at facet junctures as there is arrowhead cutting blades. To further aid in increased penetration it is desirable to align the cutting edges of the arrowhead tip with the cutting edges of the arrowhead blades. This increases penetration since the cutting blades follow the exact cut path created by the tip, and thus less kinetic energy is depleted.
Some broadhead manufacturers currently align the arrowhead tip cutting edges with the cutting edges of the arrowhead blades by attaching the tips to the arrowhead bodies via press fitting—where each tip is non-removably pressed onto a corresponding arrowhead body. Since press fitting is generally done with robotics it is possible to consistently align the cutting edges of the arrowhead tip with the blade slots of the arrowhead body, therefore when the cutting blades are attached in the blade slots the cutting edges of the blades are aligned with the cutting edges of the tip. One problem inherent with arrowheads having press fit arrowhead tips is that the tips are not replaceable. So should a press fit tip's cutting edge become damaged, for example as commonly happens when the arrow misses its mark and impacts a rock or another hard object, the entire arrowhead must be disregarded or be shot with a dull tip.
Other broadhead manufacturers use removably attachable arrowhead tips so that the arrowhead can always have an optimally structured and sharp tip, by being replaced when damaged. The removably attachable arrowhead tips generally screw-on to their respective arrowhead bodies. A problem with screw-on arrowhead tips is that they do not produce a consistent orientation of tip cutting edges with the arrowhead blades. This makes it so the tip cutting edges rarely align with the arrowhead blade cutting edges despite how exact the tolerances of the manufacturing protocol are.
It is apparent that there is a need for a replaceable or removably attachable arrowhead tip that is capable of being consistently aligned with a corresponding arrowhead body such that the cutting edges of the arrowhead tip are in-line with the cutting edges of the arrowhead blades every time the tip or a tip is attached thereto.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a replaceable or removably attachable arrowhead tip that is capable of being consistently aligned with a corresponding arrowhead body such that the cutting edges of the arrowhead tip are in-line or coplanar with the cutting edges of the arrowhead blades every time the tip or a tip is attached thereto.
It is another object of the present invention to provide a replaceable or removably attachable arrowhead tip having removably attachable tip blades, which tip is capable of being consistently aligned with a corresponding arrowhead body such that the cutting edges of the arrowhead tip and the cutting edges of the tip blades are in-line or coplanar with the cutting edges of the arrowhead blades every time the tip is attached thereto.
The foregoing objects and advantages and other objects and advantages of the present invention are accomplished as according to one embodiment of this invention with a three faceted hollow ground trocar arrowhead tip that attaches to the forward end of a fixed-blade arrowhead body. The trocar tip has a female cavity that screws onto a male stud of the arrowhead body. The trocar tip also, has an internal annular wall that has a notch formed thereon, such that the notch is in-line or coplanar with one of the three tip facet juncture cutting edges. The arrowhead body has three blade slots shaped such that when an arrowhead blade is inserted in each slot the forward leading end of each blade extends forwardly of an annular shelf or necked down region of the arrowhead body. A substantially flat metal alignm
LandOfFree
Selectably alignable removably attachable arrowhead tip does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Selectably alignable removably attachable arrowhead tip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selectably alignable removably attachable arrowhead tip will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2970402