Abstract:
A broadhead includes a one piece elongated ferrule, with a plurality of slots through a central longitudinal axis of said ferrule, at least one of which has an open end, and one piece blades mounted in the slots. At least one of the blades includes a blade slot in it and the blades having openings through them. A securing member is inserted transversely through the central longitudinal axis of the ferrule and passes through said openings through the openings of the blades securing them within the ferrule.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to provisional application No. 60/865,707 filed on Nov. 14, 2006 and is incorporated herein by reference. 
     
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH 
       [0002]    Not Applicable. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0003]    In the accompanying drawings which form part of the specification: 
           [0004]      FIG. 1  is an exploded view in front elevation of blades, ferrule and set screw of one embodiment of arrowhead of this invention; 
           [0005]      FIG. 2  is a view in rear elevation of the blades and ferrule of  FIG. 1  assembled; 
           [0006]      FIG. 3  is a top plan view of the arrowhead of  FIG. 2 ; 
           [0007]      FIG. 4  is a sectional view taken along the line  4 - 4  of  FIG. 1   
           [0008]      FIG. 5  is an exploded view in front perspective of blades, ferrule and set screws of a second embodiment; 
           [0009]      FIG. 6  is a view in side elevation of the blades and ferrule of  FIG. 4  assembled; 
           [0010]      FIG. 7  is a top plan view of the arrowhead of  FIG. 5 ; 
           [0011]      FIG. 8  is an exploded view in front elevation of a third embodiment; 
           [0012]      FIG. 9  is a view in rear elevation of the ferrule of  FIG. 8 ; 
           [0013]      FIG. 10  is an exploded view in front perspective of a fourth embodiment; and 
           [0014]      FIG. 11  is a view in rear elevation of the ferrule of  FIG. 10 . 
       
    
    
       [0015]    Corresponding reference numerals indicate corresponding parts throughout the several figures of the drawings. 
       DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0016]    The following detailed description illustrates the invention by way of example and not by way of limitation. The description clearly enables one skilled in the art to make and use the invention, describes several embodiments, adaptations, variations, alternatives, and uses of the invention, including what is presently believed to be the best mode of carrying out the invention. 
         [0017]    In the first embodiment of the present invention, referring to  FIG. 1 , a blade slot  2  is formed in a ferrule  1  with an upper open end  3  and lower closed end  4 . A blade slot  5  is also formed in ferrule  1  with an upper open end  6  and lower closed end  7 . The slots  2  and  5  are formed with axes at right angles to one another. As a result of the provision of the blade slots  2  and  5 , the ferrule  1  has a body  100  and four segments  101 ,  102 ,  103 , and  104 . Segment  101  has hole  8 , which may or may not be internally threaded, depending upon the kind of set screw  15  used, whose axis is transverse to the longitudinal axis of the ferrule  1 , at a point between upper open end  3  and lower closed end  4 . Segment  102  has a transverse, internally threaded hole  108 , aligned with the hole  8 . A blade slot,  9  is provided in a blade  10 . Transverse hole  11  forms a central opening through blade  10 . A blade slot  12  forms an opening in blade  13 . Transverse hole  14  forms a central opening through blade  13 . As can be seen, the slot  12  extends through the upper edge of the blade  13 , while the slot  9  extends through the lower edge of the blade  10 , the two blade slots being aligned when installed. Blades  10  and  13  are inserted into slots  2  and  5 , and interengage with one another. Set screw  15  is shown as being threaded at its outer end  16  with a smooth shank  17  and a conical slotted head  18 . The head  18  seats in a countersunk seat  19  at the entrance of hole  8 . Alternatively, the hole  8  can be made sufficiently large to permit the passage of the threaded part of a fully threaded type set screw, or threaded. In any case, the set screw is pushed or screwed through transverse ferrule hole  8 , passing through blade hole  11  in blade  10 , and blade hole  14  in blade  13 , and is screwed into internally threaded hole  108 , securing blades  10  and  13  in alignment in the ferrule. 
         [0018]    Referring to  FIG. 2 , the parts of  FIG. 1  are assembled showing the complete arrowhead. 
         [0019]    Referring to  FIG. 3 , the orientation of the ferrule, blades and screw attachment is shown. 
         [0020]    Referring to  FIG. 4 , the passage of the set screw  15  through the blades  10  and  13  is illustrated. 
         [0021]    Referring to  FIG. 5 , for a second embodiment, a ferrule  20  includes a slot  21  with an upper open end  22  and lower closed end  23 . Ferrule  20  also includes a slot  24  with an upper open end  25  and lower closed end  26 , oriented at right angles to the slot  21 . As with the embodiment shown in  FIGS. 1-3 , the slots  21  and  24  define four segments, opposite ones of which, in this embodiment, have aligned holes in them. One pair of segments has aligned holes  27  and  31  whose axes are transverse to the longitudinal axis of the ferrule  20 . Hole  31  is threaded. The hole  27  can be threaded or unthreaded, as has been described above. The other pair of segments has holes  27 ′ and  31 ′, whose axes are also perpendicular to the longitudinal axis of the ferrule  20 , but positioned closer to the tip of the segments than the holes  27  and  31 , sufficiently far as to accommodate a second set screw. In this embodiment, the exterior surfaces of the segments of the ferrule  20  are concave. Slot  81  forms an opening in blade  29 . Transverse hole  28  forms an opening through blade  29 . Transverse hole  30  forms another opening through blade  29 . Slot  82  forms an opening in blade  34 . Transverse hole  33  forms an opening through blade  34 . Transverse hole  35  forms another opening through blade  34 . Blades  29  and  34  are inserted into slots  21  and  24 , and interengage. Set screw  36  is applied to transverse ferrule hole  27 , passing through blade hole  28  in blade  29 , and blade hole  33  in blade  34 , securing blades  29  and  34  in alignment. Set screw  37  is applied to transverse ferrule hole  31 , passing through blade hole  30  in blade  29 , and blade hole  35  in blade  34 , further securing blades  29  and  34  in alignment. As is the case in the embodiment shown in  FIGS. 1-3 , the screws holding the blades can either be fully threaded or threaded only at their ends, in the latter case, with a smooth shank passing through the initial hole, and a head, preferably countersunk, to limit the travel of the screw, and permit its tightening. 
         [0022]    Referring to  FIG. 6 , the parts of  FIG. 4  are shown assembled to form the complete arrowhead. 
         [0023]    Referring to  FIG. 7 , the orientation of the ferrule, blades and screw attachments is shown. 
         [0024]    Referring to  FIG. 8 , ferrule  38  includes slot  39  with an upper open end  40  and lower closed end  41 . Ferrule  38  also includes a slot in the form of an aperture  42  with an upper closed end  43  and closed lower end  44 , oriented at right angles to the slot  39 . Ferrule  38  has a hole  45  whose axis is transverse to the longitudinal axis of the ferrule  38 , and an aligned, internally threaded hole  45 ′ on the other side of the slot  39 . Transverse slot  95  forms an opening in blade  47 . Transverse hole  46  forms an opening through blade  47 . Transverse hole  48  forms an opening through blade  49 . Blade  47  is inserted in slot  39  and blade  49  is then inserted in slot  42 , interengaging blade  47 . Set screw  50  is applied to transverse ferrule hole  45 , passing through blade hole  46  in blade  47  and blade hole  48  in blade  49 , and screwing into internally threaded hole  45 ′, securing blades  47  and  49  in alignment. 
         [0025]    Referring to  FIG. 9 , the ferrule of  FIG. 8  is shown with the internally threaded hole  45 ′ is shown. 
         [0026]    Referring t  FIG. 10 , a ferrule  51  includes slot  52  with an upper open end  53  and lower closed end  54 . Ferrule  51  also includes a slot in the form of an aperture  55  with an upper closed end  56  and closed lower end  57 . Ferrule  51  has a hole  58  whose axis is transverse to the longitudinal axis of the ferrule  51 , and an internally threaded hole  58 ′ on the opposite side of the slot  52 . Slot  61  in blade  62  has a closed upper end  68  and an open lower end  69  and passes through the central axis of the blade  62 . Transverse hole  60  forms an opening through blade  62 . Slot  59  in blade  64  has an open upper end  70  and a closed lower end  71 . Transverse hole  63  forms a second opening through blade  64 . Blade  64  is inserted in slot  55 , and blade  62  is then inserted in slot  52  interengaging blade  64 . Set screw  66  is pushed or screwed through transverse hole  58 , passing through blade hole  60  in blade  62  and blade hole  63  in blade  64 , and screwed into hole  58 ′, securing blades  62  and  64  in alignment. 
         [0027]      FIG. 11  shows internally threaded hole  58 ′. 
         [0028]    The set screws  15 ,  36 ,  37 , and  50  are preferably made with a head fitting in a countersink in the hole to which it is introduced, that hole being unthreaded and slightly larger than an unthreaded part of the shank of the screw, the screw being threaded at its outer section that engages threads in the other hole as has been illustrated and described. In this way the screw tends to clamp the blade when it is tightened, and at the same time, it is easier to insert. However, the holes can both be threaded, as can the entire shank of the screw. 
         [0029]    Numerous variations in the construction of the broadhead of this invention will occur to those skilled in the art in the light of the foregoing disclosure. The external shapes or dimensions of the blades and the angles of the sharp edges can be varied. The sets of slots may be offset from one another longitudinally. The blades may be offset at an angle relative to the ferrule. The body of the ferrule and the tip can be made polygonal, rather than smoothly cylindrical, with flat, concave, or convex sides. The terminal portion of the ferrule may also include numerous fittings besides the threaded shank. The blades may have top ends that are blunt, recessed or pointed. The blades edges may be straight or irregular, such as serrated. The ferrule slots need not be symmetrical in longitudinal orientation nor are the ferrule slots necessarily the same longitudinal length. The slots may be different widths in respect to one another. The blades may be the same or different length, width or height with respect to one another. The ferrule slots may be formed at an angle other than 90 degrees with respect to each other, for instance 120 degrees. One or both blade tips may extend forward from the ferrule, be flush with the ferrule, or be contained within the ferrule. If a heavier arrowhead is desired, the ferrule can be made longer. Mounting means other than screws can be employed, as a key slot or bayonet type member. Although the head of the screws illustrated are slotted, they can be provided with a Phillips head or other such head. If the blades are not to be replaced, the mounting means can be a rivet, although that is not a preferred variation. These are merely illustrative. 
         [0030]    In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results are obtained. As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.