Patent Publication Number: US-RE34397-E

Title: Arrow ringed broadhead

Description:
FIELD OF INVENTION 
     This invention relates to amusement devices and more specifically to arrows and the configuration and structure of broadheads. 
     BACKGROUND--DISCUSSION OF PRIOR ART 
     Heretofore prior art has consisted of a multitude of arrow heads and particularly broadheads used for hunting. The prior art has consisted of numerous efforts to simplify assembly of razor sharp blades in a central core element which mounts to the shaft of the arrow. The numerous configurations show various blade shapes, quantities, and interlocking means. The major problem presented while hunting with such arrows and broadheads is that after the animal has been hit, such as a deer, the animal will run and then must be tracked. The animal will slowly bleed to death but not until after running a great distance and many times will never be found by the hunter due to difficulty tracking the animal. Tracking is very difficult because the hole in the animal is limited to approximately the size of the arrow shaft. This hole in the animal seals itself around the arrow shaft due to the clotting of the blood around the wound. The animal will run a great distance as already mentioned, and will die from internal hemorrhaging and damage to life support organs. Our invention precludes these problems without affecting the performance of the arrow and its accuracy in flight. 
     OBJECTS AND ADVANTAGES 
     Accordingly we claim the following objects and advantages of our invention: to provide an arrow broadhead which provides for aerodynamic and unimpeded flight after being propelled or launched from a bow; to provide an arrow broadhead which is capable of cleanly and easily penetrating a large animals outer skin or hide after reaching it within the range of normal arrow air speed; to provide an arrow broadhead which creates a clean void or hole in the animals skin or hide which is larger than the diameter of the arrow shaft itself; to provide a means for allowing an animal struck by our invention, after being legally hunted, to bleed quickly and profusely; to provide a means for more easily tracking an animal legally hunted and hit by our invention through the snow or other ground surface conditions; to provide a means for an animal legally hunted and hit by our invention to die more quickly from rapid loss of blood previously mentioned; to provide an arrow broadhead with a unique means for changing or removing the blades easily and quickly. 
    
    
     DESCRIPTION OF DRAWINGS 
     FIG. 1 is a pictorial view of the assembled broadhead tip. 
     FIG. 2 is an exploded pictorial view of all component parts. 
     FIG. 3 is a plan view of the tapered tip shaft showing section cutting plane lines 4--4. 
     FIG. 4 is a sectional view taken from FIG. 3 showing the cross section of the tapered tip shaft. This sectional view is shown at an enlarged scale for clarity. 
     FIG. 5 is a plan view of a blade showing its features and contour. 
     FIG. 6 is a pictorial view of the snap ring. This view is shown at an enlarged scale for clarity. 
     FIG. 7 is a sectional profile view of the sharp conical tip. This view is shown at an enlarged scale for clarity. 
    
    
     LIST OF REFERENCE NUMERALS 
     10--tip. 
     12--concave cylindrical void. 
     14--protuberance. 
     16--tapered tip shaft. 
     18--shaft front. 
     20--shaft rear. 
     22--snap ring groove. 
     24--shaft extension. 
     26--threaded shaft. 
     28--broadhead shaft. 
     30 (a through c)--blade grooves. 
     32 (a through c)--blades. 
     34--ring blade. 
     36--sharp cutting edge. 
     38--major blade portion. 
     40--second longest side. 
     42--cutting edge. 
     44--smaller rectangular shape. 
     46--shortest side. 
     48--rectangular void. 
     50--semi-circular void. 
     52--snap ring. 
     DESCRIPTION 
     Referring to FIGS. 1 and 2 which show assembled and exploded pictorial views respectively, tip (10) made of corrosion resistant hardened steel and having a finely pointed and sharp conical tip and a concave cylindrical void (12) (best shown in FIG. 7) at the opposite end of the sharp tip which accepts and holds protuberance (14) by means of a tight frictional press fit. Protuberance (14) is of cylindrical shape and is a homogenous continuous part of the aluminum tapered tip shaft (16). .[.The taper of the tapered tip shaft begins at shaft front (18) and gradually tapers to a larger diameter at shaft rear (20)..]. .Iadd.The taper of the shaft begins at shaft rear (20) and gradually tapers to a smaller diameter at shaft front (18). .Iaddend.The diameter at shaft front (18) is approximately twice as large as the protuberance (14) diameter (this is best shown in FIG. 2). Also, a continuous and homogenous part of the tapered tip shaft is snap ring groove (22), shaft extension (24), and threaded shaft (26). Snap ring groove (22) is a void created by metal removal so as to form a cylindrical shape of diameter equivalent to that of protuberance (14). Shaft extension (24) is a cylindrical shape of diameter equivalent to the shaft front (18), and the threaded shaft (26) has a major thread diameter equal to or slightly more than the diameter of the snap ring groove. Equally spaced at 120 degrees apart from each other are three blade grooves (30 a through c) which traverse the length of the broadhead shaft (28) at a depth sufficient to penetrate the surface of protuberance (14) along the entire protuberance, tapered tip shaft, and shaft extension, but not the threaded shaft. The blade grooves are tangent to a diameter equal to or slightly greater than the major diameter of the threads on the threaded shaft. The thread on the threaded shaft of this embodiment is a #8-32UNC external thread, but may be another size and form in the infinite other similar embodiments of our invention not shown here. The width of each blade groove is of sufficient dimension to hold blades (32 a through c) in their radial positions with a slight frictional slip fit. 
     Ring blade (34) made from stainless steel is a hollow cylindrical cutting blade approximately 0.175&#34; long and having a ground bevel all around one exterior edge of its cylindrical shape extending inward until it meets the interior cylindrical surface, thereby forming a sharp cutting edge (36). Our invention consists of more than one blade (32), but shown herein in this embodiment are three blades (32 a through c), all made from stainless steel. Each blade contour is the sum combination of other more simple or fundamental geometric shapes which best describe its outline. Each blade&#39;s major blade portion (38) is best described by a right triangle where the second longest side (40) forms the cutting edge (42) by virtue of a ground bevel from each surface of the blade extending inward toward the center of the blades edge or thickness. Where the hypotenuse meets the shortest side of the triangle, a smaller rectangular shape (44) overlaps the triangle corner formed there so that the hypotenuse and one edge of the rectangle are coincident and that the shortest side of the triangle intersects the opposite side of the rectangle. Both the second longest side of the triangle (40) and the shortest side (46) have a slight curvature inward, or radius, thereby replacing those otherwise straight triangle sides. Approximately halfway along the hypotenuse is a rectangular void (48) normal to the hypotenuse extending toward the opposite corner of the triangular shape. Another void, this one of an extended semicircular shape (50) extends from where the rectangular shape meets the shortest side (46) partially through the rectangular shape. The sharp razor edges of the blades may be either straight or have a slight concave radius upon completion of their fabrication and prior to their sharpening, as shown in the embodiment herein. A snap ring (52) made from a spring-tempered steel is of hollow cylindrical construction with a narrow void through its entire length, best shown in FIG. 6. 
     OPERATION 
     Assembly of the invention described herein is accomplished in the following manner: tip (10) is pressed onto protuberance (14). Ring blade (34) is slid over tapered tip shaft (16) and held in place there by the user&#39;s hand while three blades (32) are placed into blade slots (30) and so that the front tip of each blade fits snugly against tip (10). Snap ring (52) is then slid over threaded portion (26) and shaft extension (24) before snapping into place in snap ring groove (22) over semi-circular slot (50) of the blades holding them in place. The entire assembly is then threaded into an existing arrow shaft (not shown nor a part of this invention). The arrow is then ready for use with our invention mounted to its front end. As described earlier in Objects and Advantages of this invention, upon hitting its target such as a deer during deer hunting season, a hole significantly larger than the arrow&#39;s shaft will be created in the skin or hide of the animal thereby expediting the bleeding, internal organ damage, and death processes.