Hunting broadhead for arrows

A hunting broadhead for attachment to an arrow used in bow hunting of a game animal having two thin flat metal elongated blades juxtaposed each other pivotally secured in a slot situated in a rearwardly located tubular body. Each blade has a pointed first end adapted to precede the arrow in flight for penetration of the animal's hide and initial movement into the animal. Each blade has one sharpened lengthwise side and one blunted side with the outstanding spur, the blunted sides extending outwardly of the sharpened sides when the pointed front ends overlap permitting an elastic band to encompass both said blades to maintain such configuration for flight and initial penetration of the animal. After penetration into the game animal, rearwardly located outwardly protruding spurs engage the animal's hide causing a metamorphosis whereupon the blades rotate with the rear moving to the front to become the forward leading point. After rotation, the sharpened blades become the leading members of the wide "V" configuration for continued movement through the animal to effect a clean kill.

BACKGROUND OF THE INVENTION 
1. Field of the Invention. 
The field of the invention is broadheads or points (also called arrowheads) 
for arrow shafts used with a bow for hunting. More particularly, the field 
involved concerns broadheads which assume one configuration during flight 
and a second configuration after it strikes the target, such as to more 
efficiently accomplish its function of humanely disabling and killing the 
game animal. 
2. Description of the Related Art. 
In recent years there has been significant advances in the art of 
broadheads for hunting arrows designed to cause the animal to cease its 
travel by more effectively disabling and killing the animal being hunted 
and while doing so, reduce suffering by the animal. 
Other inventions include the arrowhead assembly by Vance in U.S. Pat. No. 
2,820,634 where two blades pivotably mounted to the head of the arrow 
shaft, when striking the side of the animal, immediately begin to rotate 
past each other to a expanded "V" configuration. The blades are initially 
joined in a somewhat pointed orientation. It is noted that the sharpened 
edge which is presented in the initial orientation remains the sharpened 
edge in the final opened "V" configuration. 
The patent of Vance is modified somewhat in Rickey, U.S. Pat. No. 
3,578,328, where in a similar construction, the arrow shaft body continues 
beyond the front point of the two pivotable blades to form a front 
piercing point. The two blades, like those in Vance, rotate past each 
other when rotational movement is forced upon the blades by the blades 
engaging the hide of the animal. A same sharpened edge which engages the 
animal initially is the forward sharpened edge as the arrowhead proceeds 
through the body of the game animal. 
Lastly, Steinbacher in U.S. Pat. No. 2,568,417 adopts the forward point of 
an arrow shaft as the leading point and secures rotatable blades within 
the arrow shaft forward point. The blades are rotated outwardly not 
crossing each other as outstanding flanges on the blades engage the animal 
after initial penetration by the forward point portion. Other U.S. patents 
which show features similar to the features described above but 
constructed in a different manner include Bergmann, U.S. Pat. Nos. 
4,166,619; Vocal, 4,615,529; Cox, 3,738,657; and Hendricks, 3,600,835. 
All of the above prior art patents are characterized by arrowpoint bodies 
which have protruding spurs or cutting blades extending outwardly from its 
sides, some extending prior to the arrowpoint entering the body of the 
animal and some extending after the arrowpoint has entered the body of the 
animal. The extending blades or spurs appear to accomplish their function 
very efficiently, i.e., that of cutting as wide a swath as possible in 
order to bring the game down. 
All of the arrowheads or points illustrated above employ a cylindrical 
pointed arrowhead body (with the exception of Vocal and Vance) with the 
spurs or blades emerging from the body, either being pivotable near the 
head of the body or at the rear of the body, some pivoting upon entering 
the body of the animal and some pivoting after entry into the body of the 
animal. This, of course, is not without reason since for the arrow to 
travel through to its target with minimum air resistance, it is generally 
necessary that the smallest point cross-section as possible be utilized. 
However, the cylindrical body portion of the arrow point itself is 
relatively inefficient as it contributes very little to the end results of 
the arrowhead. 
Thus, the relative efficiency of the arrowhead or point may well be 
improved if the whole point itself comprises the blades which ultimately 
rotate outwardly. Vance does present an arrowhead assembly wherein the 
cutting blades also comprise the forward point, however, the blades are so 
arranged that they commence rotation and open to the widest possible 
configuration immediately upon hitting the hide of the animal and thus 
suffer the possibility of not only dulling on the animal hide, especially 
if the animal has dried mud or dirt on its side, which is highly likely, 
but also being forced to engage a heavy hide in the open position on 
initial penetration and thereby wasting considerable energy. In addition, 
since the sharpened edges are always exposed, a safety hazard is always 
presented to the hunter in handling the arrowhead prior to use. 
It is also apparent that an obvious improvement to the state of the art 
exists if the rather small point on the arrow shaft necessary for guiding 
the arrow to it's mark should, upon striking the animal, metamorphosis 
entirely into outstanding cutting blades which bring down the game more 
efficiently. 
It is also apparent that an obvious improvement exists if the sharpened 
edges can be protected against dulling or operator injury prior to the 
arrowhead entering the body of the game animal. Further it would also be a 
considerable improvement if both blades could be locked together during 
initial penetration until the heavy hide and ribs have been penetrated. 
SUMMARY OF THE INVENTION 
The embodiment of the invention described consists of two blades pivotably 
mounted to a rearward located cylindrical body, the cylindrical body 
adapted to be attached to one end of an arrow shaft. More specifically, 
the two blades, which are identical in construction, are so constructed as 
to form a pointed first forward penetrating portion of the hunting 
broadhead (well before the cylindrical body touches the game hide). As the 
hunting broadhead enters the body of the animal, outstanding spurs 
attached to the blades and situated rearward of the forward section of the 
blades are engaged by the animal hide or bones (ribs) on contact to cause 
the blades to pivotally separate to form an inverted "V" configuration, 
all within the body cavity of the animal. At that time, the hunting 
broadhead has gone through a complete metamorphosis from a relatively 
sharp and narrow pointed hunting broadhead for initial penetration to a 
very wide broadhead that relies entirely upon the extending blades for 
cutting while penetrating. Further, the cylindrical body never is the 
predecessor of the blades. 
My first hunting point, (U.S. Pat. No. 5,046,744 issued Sep. 10, 1991) 
depended upon friction between two blades to keep the blades positioned 
together to form the narrow sharpened hunting point which was maintained 
during storage of the hunting point, handling by the operator, and initial 
flight from the bow to the animal. Further, my first hunting point also 
depended upon one angled side of each of the blades of the sharpened front 
edge of the point engaging the animal to keep the blades together after 
initial penetration until the rearwardly located outstanding spurs engage 
the animal's hide and bones. 
In my present invention, I utilize a rubber band situated at some point in 
front of the outstanding spur on each blade (later discussed) as well as 
side pressure created by contact to exposed edges anterior to the spurs to 
keep the blades together. 
Each blade is an elongated thin piece of metal having a combination of 
partially sharpened edges, blunted partially chamferred edges, and square 
cut edges (edges unmodified after the blade is stamped or cut out of flat 
stock). At a first or forward end is a point (formed from two angled 
partially chamferred edges), with a first side joining one of the 
partially chamferred edges of the pointed first end, said first side 
having a long, slightly curved, sharpened cutting edge which extends to 
the opposite second or rear end where it terminates in a substantially 
right angle foot, the edges making up the right angle foot also being 
sharpened. 
Along the second side joining the other partially chamferred edge making up 
the pointed first forward end is a substantially straight partially 
chamferred angled edge extending approximately 60 percent of the length of 
the blade, this partially chamferred edge terminating into an outwardly 
protruding spur, which spur also has a partially chamferred edge on its 
forward portion. The rubber band previously discussed is preferably 
retained at the intersection of the substantially straight partially 
chamferred edge and the outwardly protruding spur edge. 
Proceeding rearward from the outwardly protruding spur, the falling edge of 
the blade is square cut (having neither a sharpened edge nor a partially 
chamferred edge), and retreats toward the first side at an angle to form a 
second stop until it reaches the vicinity of the opening formed in each 
blade to accommodate a pivot pin. Surrounding that opening is a 
semi-circular outwardly directed protrusion. Lastly, the semi-circular 
protrusion accommodating the pivot pin opening then joins with a short 
straight square cut edge to form a first stop which terminates at the 
right angle foot. This first stop is urged against the side of the 
cylindrical body by the rubber band to define the position of each blade 
forming the pointed configuration. 
Receiving two blades in a back-to-back configuration is an elongated 
cylindrical body having at a first end a chamferred rounded edge (not 
necessarily forming a point although it could) and at the opposite end, 
male threads to be received in female threads at the end of an arrow 
shaft, or any other arrangement to attach to the end of an arrow shaft. At 
the first end of the cylindrical body is a lengthwise elongated slot, the 
slot adapted to receive the two identical blades of the invention. 
Transversely to the elongated slot and on opposite sides are openings to 
secure the previously mentioned pivot pin. This pivot pin resides in the 
opening of each of the two blades making up one complete hunting 
broadhead. 
When the hunting broadhead is assembled, the blades are positioned so that 
their back surfaces, which are completely flat not having the formed 
sharpened edges or partially chamferred edges, are placed juxtaposed each 
other. By this means, the surfaces making up the sharpened edges and 
partially chamferred edges of each blade will be on the outside and never 
hidden by the opposite blade. The hunting broadhead is assembled by 
aligning each of the blade's opening over the opening in the cylindrical 
body and then inserting the pivot pin into the opening on one side of the 
cylindrical body, through each of the openings in each of the blades, and 
into the opening on the other side of the cylindrical body so that the 
pivot pin completely crosses the elongated slot. The diameters of the 
openings in the cylindrical body and the pivot pin are very close to each 
other so that there is a tight frictional holding relationship between the 
two such as to keep the pivot pin in place once inserted, i.e., the pin is 
best driven into the openings in the cylindrical body. Other means, such 
as threading, may be used to retain the pivot pin in the body. However, 
the opening in each of the blades is slightly larger than the diameter of 
the pivot pin so that the blades freely rotate. In addition, unlike my 
first hunting point, the width of the elongated slot in the cylindrical 
body need no longer be sized as to frictionally compress the two blades 
against each other but, may be larger. 
It is noted that when the hunting broadhead is assembled and the first 
forward ends of each blade brought together to form the point of the 
broadhead, the first stop of each blade is urged against the sides of the 
cylindrical body. In this configuration, the sharpened first side or edge 
of each blade is recessed in position behind the partially chamferred edge 
of the opposite blade such that if a person were to grab the forward point 
or first end (at its sides) of each broadhead, their fingers come in 
contact with the two opposite partially chamferred edges and not the 
sharpened edges. The point of the resulting broadhead is also formed from 
two partially chamferred edges on each blade. The rubber band may be 
installed upon the hunting broadhead by slipping it down over the forward 
60 percent or so length of the broadhead to stop at the base of each spur. 
In slipping the rubber band down over the broadhead, the band only engages 
the partially chamferred edges and is thus not severed. 
The feature of utilizing the partially chamferred edge on one side of each 
blade and recessing the sharpened edge back behind the partially 
chamferred edge of the opposite blade (when assembled) provides an obvious 
safety measure in that the operator's fingers never come in contact with 
the sharpened edge so long as the hunting broadhead is handled in its 
forward 60 percent of its length or so. Additionally, if the animal which 
is shot has caked dirt or mud on its side, and this is very common, or if 
the animal's hide is very tough, the sharpened edges of the blades never 
directly engage the mud, hair, hide, or ribs or initial impact of the 
animal. Thus they are protected against dulling during entry into the 
animal and prior to each blade beginning its pivotal action to form the 
widened "V" configuration whereby the sharpened edge is placed forward. 
This pivotal operation commences after approximately 60 percent of the 
broadhead has entered the body of the animal's body and is completed 
entirely within the body cavity. 
After entry, when the two blades rotate to open, the blades reach a point 
where the second stop of each blade engages the side of the cylindrical 
body at which time the blades form a common sharpened point of a widened 
"V" configuration. This point is formed by the right angle boots 
previously spoken of. As the hunting point continues along through the 
animal body, the rubber band may roll off each blade along its spur and 
end up residing on the arrow shaft or may be cut depending upon the 
hardness of the animal part interacting with the broadhead. 
To withdraw the hunting broadhead from a game animal, the hunter grasps the 
arrow shaft and pulls backwardly. This causes the sharpened blades to 
rotate back to their initial flight position and present minimum 
resistance to the withdrawal of the arrow shaft and attached broadhead. 
The advantage of providing one edge highly sharpened for cutting and the 
other edge partially chamferred for exposure at all other times provides 
great benefits in the subject hunting broadheads. 
Accordingly, it is an object of the subject invention to provide a hunting 
broadhead which presents a relatively small sharp end or projection with 
minimum cross-section designed to penetrate the hide of the game animal 
but which, upon travel through the game, expands to provide a very sharp 
cutting edge to kill the animal in the most humane way possible. By such 
means, energy is not wasted in making a large surface entry opening. 
It is another object of the subject invention to provide a hunting point 
which is most efficient and provides that the blades making up the hunting 
point metamorphoses from a relatively sharpened narrow point to a broad 
cutting inverted "V" sharpened formation. 
It is still a further object of the subject invention to provide a hunting 
broadhead without a forward cylindrical body leading the arrow shaft into 
the game animal. 
It is still further an object of the subject invention to provide a hunting 
broadhead which provides non-sharp partially chamferred edges for handling 
by the hunter so as to prevent cutting injuries to the hunter when using 
the hunting broadhead. 
It is still a further object of the subject invention to provide a hunting 
broadhead having sharpened cutting edges which are protected against 
dulling prior to their designed time for cutting internally into the game 
animal. 
Other objects of the invention will in part be obvious and will in part 
appear hereinafter. The invention accordingly comprises the apparatus 
possessing the construction, combination of elements, and arrangement of 
parts which are exemplified in the following detailed disclosure and the 
scope of the application which will be indicated in the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring now to FIG. 1, a top view of the subject inventive hunting 
broadhead is shown apart from an arrow shaft. Firstly, hunting broadhead 
10 is made up of two elongated flat metal blades, namely first blade 12 
and second blade 14, the blades so oriented that they lay or are 
juxtaposed one upon another with the back sides of the blades touching 
each other. 
Blades 12 and 14 are situated within an elongated slot (not shown) formed 
in solid cylindrical body 16 so that they will, at the proper time, rotate 
about pivot pin 18 attached to cylindrical body 16 and pass transversely 
across its slot. However, the two blades are secured together in a closed 
position by an elastic or rubber band 20 (or they may be tied together 
with string), band 20 urging each of the blades' first stop (36 and 44) 
located at the rear or bottom of each of the blades against cylindrical 
body 16 whereby rotation in the direction normally urged by the rubber 
band upon each blade is terminated. As shown in FIG. 1, the blades 
overlap, but not completely, in that, by judicious recession of a 
substantial portion of the length of each blade's sharpened edge behind 
the opposite blade's partially chamferred or beveled edge, great safety 
benefits are provided. Other benefits provided are discussed later. 
Also as seen in FIG.1, cylindrical body 16 is terminated in threaded shaft 
17 adapted to be engaged by the threaded female opening of an arrow shaft 
(not shown). 
Elongated first blade 12, which front or top face is shown, comprises a 
thin flat piece of high quality steel, preferably having a thickness of 
about 0.050 inch, an overall length of approximately 21/2 inches, and a 
width of approximately 1 inch (including the protruding spur). Blade 12 
has the top flat face of its right hand side (first side) peripheral edge 
22 ground off to form a razor sharp edge which traverses substantially the 
length of the blade. All sharpened edges are preferably formed this way. 
In the preferred embodiment, peripheral edge 22 is slightly arcuate or 
concave along its length. Peripheral edge 22 could, however, be straight. 
The top end of the blade 12 is terminated in a point 26 and the bottom end 
with foot 28. At the top, joining sharpened peripheral edge 22 point 26 is 
angled edge 19 which is blunted by partially chamfering or beveling. When 
an edge is partially chamferred, only a portion of the right angle corner 
of the edge is knocked off (by preferably grinding) so that the right 
angle edge is present for approximately 15% of the blade thickness. 
Blunting of an edge may also be accomplished by rounding the edge. 
At the bottom, foot 28 is formed by a blade 12 making substantially a right 
angle at its joiner with sharpened edge 22. Foot terminates on its other 
side in first stop 36. Along the bottom peripheral edge of foot 28, the 
edge is highly sharpened as it was along sharpened edge 22. 
Opposite peripheral edge 22 and an the left hand side (second side) of 
blade 12, starting at the top, angled edge 21 intersects with previously 
discussed angled edge 19 to form point 26. Angled edge 21 is also a 
blunted partially chamferred peripheral edge. Next, blunted partially 
chamferred or beveled peripheral edge 23 recedes rearward from a second 
location along a substantially straight angled line from angled edge 21 
diverging from first side 22 approximately 60 percent of the length of the 
blade 12 to a first location where it joins outstanding spur 30. Outwardly 
protruding spur 30 also has a forward portion, partially chamferred edge 
24. Residing at the first location, i.e., intersection of the second side 
partially chamferred edge 23 and forward peripheral edge 24 of spur 30, is 
rubber band 20. 
Proceeding rearward, outwardly protruding spur 30 falls off along its 
rearward portion towards the first side along square cut peripheral edge 
25, which constitutes second stop 25 later discussed. Continuing, second 
stop 25 next joins a semi-circular outwardly producing extension (covered 
by cylindrical body 16) which accommodates an opening receiving pivot pin 
18. After the semi-circular protrusion, the left hand edge joins first 
stop 36 shown resting against the cylindrical side of body 16. First stop 
36 holds first blade 12 in the forward position in FIG. 1 as rubber band 
20 urges first blade 12 and second blade 14 together. The first stop of 
each blade engage opposite sides of cylindrical body 16. 
Shown beneath first blade 12 is second blade 14, the unmodified flat back 
or underside of blade 14 visible. Second blade 14 is a duplicate of first 
blade, being only reversed in position in cylindrical body 16 so that 
neither its sharpened peripheral edges nor partially chamferred edges may 
be seem in FIG. 1. The back side of partially chamferred second side 
peripheral edge 50 and a portion of sharpened peripheral edge 48 are 
shown. 
Further, second blade 14 second side outwardly protruding spur 40 is 
detailed, the bottom or back side of its forward partially chamferred 
peripheral edge 52 shown. The bottom of second blade 14 first side's 
arcuate sharpened edge 48 is revealed emerging from below the straight 
partially chamferred edge 23 and spur 30 of first blade 12. Also seen in 
the back side of sharpened foot 42 and first stop 44. Again, in the 
position shown, first stop 44 of second blade 14 is urged against the side 
of cylindrical body 16. 
The most forward point 46 (not shown) of second blade lies immediately 
beneath and is aligned with point 26 of first blade 12 and, like point 26 
of first blade 12, is formed by the intersection of two partially 
chamferred edges. By reducing the sharpness of points 26 and 46 with 
partially chamferred edges, the safety features of the subject invention 
have been additionally enhanced as the point of broadhead 10 will be less 
likely to stick the person handling it. Nevertheless, points 26 and 46 are 
still sufficiently sharp that they will easily puncture the hide of the 
struck animal when delivered by the hunter's bow. 
With rubber band 20 at the base of partially chamferred peripheral edge 23 
of the second side of the first blade 12 at the same place on the second 
side of second blade 14, the two blades are held together with their first 
stops engaging cylindrical body 16 to place the blades in the forward 
pointed position with their respective front points overlapping. 
In the forward approximately three-quarters of the length of broadhead 10, 
the sharpened edge of each blade is protected by being recessed back from 
a partially chamferred edge of the opposite blade. For example, right 
sharpened peripheral edge 22 of first blade 12 is recessed behind the 
partially chamferred edge 50 of second blade 14 from its joinder with 
angled edge 19 near point 26 to its emergence from behind second stop 45 
below outstanding spur 40. It is also important to keep this sharpened 
blade protected until after it has entered the body of the animal since 
the hide of the animal or rib bones (or for that matter, dirt on the 
animal's hide) will dull the sharpened edge. 
Similarly, sharpened edge 48 second blade 14 is similarly recessed away 
from the partially chamferred edge 23 of first blade 12. By such means, 
the hunter can handle the subject broadhead in the forward three-quarters 
of the broadhead without danger of cutting himself. Typically, sharpened 
blades utilized in broadheads are razor sharp. 
Rubber band 20 then may be slipped over the blunted partially chamferred 
edges of the second sides of each of the overlapping blades to position 
itself at the base of the two partially chamferred forward edges 24 and 52 
of spurs 30 and 40 without danger of being severed. 
While a rubber od elastic band has been suggested to secure the two blades 
together, other means have also been used. For example, I have applied an 
adhesive between the two blades at or near the first end. Also, it is 
possible to place a dimple or detent in the blades at or near the first 
end whereupon a concave dimple of one blade would reside in a convex 
dimple of the other. Of course, the blades with detents would not be 
interchangeable and separate blades with detents in opposite directions 
would need be fashioned. In addition, not shown, but it is apparent that a 
spring clip may be fashioned which would secure the lower rear end 
portions of both blades in the closed position. 
The configuration of broadhead 10 shown in FIG. 1 is the configuration of 
the blades during storage, during time of flight between the hunter's bow 
and the game animal, and during the initial penetration of the game 
animal. When penetrating the game animal, the two blades continue to stay 
together until the broadhead has penetrated to a depth such that the hide 
of the animal engages the forward partially chamferred peripheral edges 24 
and 54 of the spurs 30 and 40 respectively. On most occasions, the animal 
will be struck in the rib cage area and the ribs immediately beneath the 
animal's hide will be engaged by the spurs. At that time, each blade 
begins to rotate about pivot pin 18 to begin opening of the two blades as 
shown in FIGS. 2 and 3. 
As previously indicated, in my prior application, I depended upon friction 
between the backsides of the blades caused by carefully sizing the width 
of the elongated slot in the cylindrical body to tightly compress the 
blades to keep the blades in the closed position during storage, flight of 
the hunting point, and initial penetration of the animal. Also, during 
first few inches of penetration of the animal, the forward point of each 
blade was so shaped that pressing of the flesh and internal organs against 
the left hand angled edge which substantially made up the point, together 
with a slightly less angled left hand portion of each blade extending from 
near the point to the rear spur, continually urged the first stop of each 
blade against the cylindrical body and thereby kept the blades together. 
This is not to say that a frictional relationship between the two blades to 
keep them together can not be utilized in my present invention, because it 
could. Such an embodiment would be obtained by carefully sizing the width 
of the slot in the cylindrical body. 
In the embodiment of the subject invention, I no longer depend upon a 
frictional relationship between the blades or a left front angled side 
retreating from the point together to keep the blades together. Now I 
utilize a rubber band and a long extending angled straight left side to 
accomplish that feat. The angled sides situated immediately on each side 
of the point of the blade are almost symmetrical, although the left hand 
side is still slightly favored. Further, by my new design, the forward 60% 
or so of the blades have a thinner width for easier penetration. 
In the process of modifying my original design, I have greatly enhanced the 
safety features to remove the sharpened edges away from the hunter's 
fingers well over three-quarters of the length of the broadhead as well as 
protecting the sharpened edges from dulling at all times prior to actual 
presence in the body cavity of the animal. 
Referring now to FIG. 2, a top view of broadhead 10 is shown in a partially 
open configuration such as the broadhead might encounter just as its spurs 
have engaged the hide or ribs of a game animal and started rotation of 
each of the blades. Note that the rubber band is now being stretched as 
the blades open, the hitting force of the spurs against the hide or ribs 
of the game animal being sufficient to overcome the resistance of the 
rubber band holding the blades together. At this point, the forward 
portion of each of the blades is interiorly the body of the game animal 
and the hide or ribs of the animal are still restraining spurs 30 and 40 
respectively. One additional advantage of having the forward edges of each 
of the spurs not razor sharp is that any tendency on the part of the 
blades to slice through the hide or the ribs and not open the blades is 
considerably lessened. At this point in time, the sharpened peripheral 
edges 22 and 48 of blades 12 and 14 respectively have begun to engage and 
cut the interior body of the animal between the two blades, which also 
helps to spread the blades. Additionally, animal flesh pressing against 
rubber band 20 may at this time cause it to be severed across partially 
chamferred edges 24 and/or 52. 
A more revealing picture of the back or underside of second blade 14 is 
seen in FIG. 2, this side showing the flatness of the blade and the lack 
of sharpened or partially chamferred edges. It is of course realized that 
the peripheral sharpened edges 22 and 48 could be formed by taking equal 
amounts of metal off both sides of the blade to achieve a razor sharp 
edge, however, for economy of manufacture, to construct the sharpened 
edge, only one side has metal removed. Also, if the blades are sharpened 
to a central "V", then opportunity is afforded for hair and hide to wedge 
between the flat surfaces of the blade. Similarly, the partially 
chamferred or beveled edges 23 and 50 (and others) might also be 
constructed by partially chamferring both the top and the bottom face to 
leave a flat ridge between the two chamfers (rather than a sharp cutting 
edge), however again, for economy of manufacture and to prevent material 
from being wedged between flat sides of the blades during penetration, 
metal was removed from only one side of the blade to achieve the partial 
chamfer or bevel. 
As previously mentioned, alternate embodiments of the invention may include 
other means to keep the blades together, such as adhesive 60 shown at the 
first end of second blade 14. The adhesive used by the inventor was a 
silicone sealant. This adhesive was sufficiently strong enough to keep the 
blades together in flight, in penetration and initial movement into the 
animal, yet did not prevent the blades from separating when the spurs 
struck the animal's hide. The adhesive was applied by placing a small 
amount upon one blade end and then moving the blades together to allow it 
to adhere to both blades. Then the adhesive was allowed to harden. Excess 
adhesive which might ooze out between the blades was wiped off. 
Also seen in FIG. 2 is a second embodiment, namely the dimple or detent 62 
placed into each blade. On the second blade 14, the dimple is concave. 
First blade 12 has a convex shaped dimple or detent (not shown) which is 
so aligned as to mate with dimple 62 when the blades are in the fully 
closed position. The interlocking dimple or detent arrangement similarly 
provides sufficient holding to keep the blades together until time for the 
blades to pivot apart. 
Also seen in FIG. 2, first stop 36 of first blade 12 and first stop 44 of 
second blade 14 have now left their position abutting the circular sides 
of cylindrical body 16. 
FIG. 3 shows broadhead 10 in its fully open position, that position assumed 
by blades 12 and 14 where both foots 28 and 42 (formerly at the bottom of 
each blade) now overlap with overlapping points formed from the 
intersection of elongated sharpened edges 22 and 48 with sharpened foots 
28 and 42 respectively. Elongated cutting edges 22 and 48 of blades 12 and 
14 now are in full array to humanely kill the animal. Each of the blades 
have rotated from their position shown in FIG. 2 until each of their 
respective second stops engaged the circular sides of cylindrical body 16. 
More particularly, second stop 25 of blade 12 and second stop 45 of blade 
14 each fully engage cylindrical body 16 which keep the blades in position 
shown in FIG. 3 throughout the broadhead's travel interiorly of the 
animal. 
It is noted at this point that rubber band 20 has now slipped from its 
position (if not severed) at the base of partially chamferred sides 23 and 
50 of respective blades 12 and 14 along partially chamferred leading edges 
24 and 45 of respective spurs 30 and 40. Even with rubber band 20 coming 
off, if it has not been severed and if desired, it may be retrieved and 
reused. It will remain upon the shaft of the arrow (not shown) when it 
comes off. The alternate means of holding the blades together prior to 
their opening are also shown, namely first alternate, a small amount of 
adhesive 60 and second alternate, a dimple or detent 62. 
FIG. 4 is a side view of solid cylindrical body 16 in which the two blades 
12 and 14 reside. Firstly, cylindrical body 16 has a chamferred or beveled 
top conical surface 15 formed at its front so as to prevent undue 
opposition to its passage in the animal's interior. Cut parallel to the 
cylindrical axis of body 16 is elongated slot 33 in which resides the 
semi-circular protrusion of each of the two blades 12 and 14. These 
semi-circular protrusions are shown in FIGS. 6.A. and 6.B. infra. Shown 
also passing through cylindrical body 16 and at right angles to slot 33 is 
opening 35, opening 35 adapted to accommodate pivot pin 18 shown in FIG. 5 
to secure the pivot pin across the slot. Since it is intended that pivot 
pin 18 shall frictionally reside in opening 35, the diameter of opening 35 
should by only slightly less than the diameter of pivot pin 18 so that the 
pin may be driven in. Lastly, shaft of arrow 60 is shown attaching to the 
lower portion of cylindrical body 16, arrow shaft 60 having female threads 
formed in a blind cavity therein which mate with the male threads shown on 
the lower portion of cylindrical body 16 in FIGS. 1-3. Of course, other 
provision may be made for attaching the body 16 to an arrow shaft. 
It is noted that in the subject invention, the width of slot 33 need not be 
tightly controlled as it was in my prior invention, subject of the above 
referenced patent application, since I no longer depend upon friction 
between the blades to keep the two blades together. Previously, the width 
of slot 33 was carefully cut to ensure that the two blades rubber each 
other sufficient friction therebetween that they would stay together 
during storage, flight, and initial penetration of the animal. Since I now 
depend upon a rubber band to keep the blades together, the width of slot 
33 is no longer critical and the blades can fit more loosely therein. 
FIG. 5 is a side view of elongated, cylindrical pivot pin 18 which passes 
through the opening in each of the blades and is secured within opening 35 
of cylindrical body 16. 
Referring now to FIG. 6.A. and 6.B., a top or front view of each of the 
blades 12 and 14 is shown. As can be seen, each were constructed identical 
to the other to simplify manufacture. When mounted in the cylindrical 
body, they are placed with their flat uninterrupted back sides together. 
Commencing with FIG. 6a, at the very top is point 26 which is almost 
equally divided between angled sides 21 and 19 although in the preferred 
embodiment, left angled side 21 is slightly longer than right angled side 
19. Both sides 21 and 19 have blunted partially chamferred edges so as not 
to present a sharp cutting edge. Point 26, however, is an angled point 
which has not been blunted as a point as it is formed by the two sides 21 
and 19. Along the elongated right-hand or first side of blade 12, 
elongated peripheral edge 22 is sharpened from a second location at its 
joinder with angled side 19 wherein metal has been removed along the 
surface at the edge to meet the backside of blade 12 and achieve a razor 
sharp edge. Sharpened edge 22 is in the preferred embodiment slightly 
arcuate along its length, but may be straight providing it does not extend 
beyond the partially chamferred edge of the opposite blade when the unit 
is assembled and the blades fully overlapping. At the bottom end of blade 
12 is sharpened foot edge 28, the angle made between the two sharpened 
edges 22 and 28 which became the front point in the configuration of FIG. 
3, being just slightly less than a right angle. 
On the opposite left hand or second side of blade 12 in FIG. 6.A. is 
blunted partially chamferred edge 23 which commences at the top second 
location connecting with left angled edge 21 and falls back in an angled 
substantially straight line diverging from the first side 22 to meet with 
spur at a first location. Along the forward peripheral edge of spur 30 is 
blunted partially chamferred edge 24, edge 24 at an acute angle to a 
longitudinal line drawn between point 26 and the center of opening 32. The 
angle of spur 30 to the longitudinal line referred to is shown at about 70 
degrees. It may however be varied between 45 degrees and 90 degrees. 
Outwardly protruding spur 30 then falls off downwardly with second stop 25 
angled towards sharpened edge 22, second stop 25 terminating at 
semi-circular protrusion 34, protrusion 34 having circular opening 32 
formed in it. Opening 32, as earlier eluded to, receives pivot pin 18 
shown in FIGS. 1-3 and 5 rotatably secure blade 12 to cylindrical body 16. 
Opening 32 is just slightly greater in diameter than pivot pin 18 so that 
while the blade will rotate easily, there is not excessive side-to-side 
movement. 
Lastly, semi-circular protrusion 34 joins with first stop 36, stop 36 
defining one side of sharpened foot 28. Both first stop 36 and second stop 
25 provides limits to the rotation of blade 12 within cylindrical body 16, 
first stop 36 serving to define broadhead 10 in a position with 
penetrating point 26 forward of cylindrical body 16 for partial 
penetration of the animal and second stop 25 serving to define the 
position of broadhead 10 in its fully widened inverted "V" configuration 
cutting position. 
FIG. 6.B. is a top view of second blade 14 (turned over from the view seen 
in FIGS. 1-3) to reveal its top or front side. It has forward most point 
46 formed in part by right hand or first side angled edge 47 joining with 
the first side elongated sharpened peripheral edge 48 which continues in a 
sweep to sharpened peripheral foot 42 at the bottom of blade 14. Like 
blade 12, left angled side 43 and right angled side 47 define point 46 and 
are blunted partially chamferred edges. Sharpened edge 48 is also slightly 
arcuate (or it could be straight under circumstances outlined above) and 
the angle it make with foot sharpened edge 42 is approximately 90 degrees. 
On the opposite or second side of blade 14 in its upper part is angled 
left hand edge 50, edge 50 falling substantially straight from left angled 
edge 43 to the forward peripheral edge 52 of protruding spur 40. Rearward 
of spur 40 is second stop 45 which falls off towards the first side edge 
48 to join with semi-circular outwardly extending protrusion 66 
encompassing circular opening 68, opening 68 adapted to accommodate pivot 
pin 18 when blade 14 is situated in slot 33 of cylindrical body 16. 
Lastly, semi-circular protrusion 66 then joins with first stop 44 
immediately below, first stop 44 then forming one side of sharpened foot 
42. Again, as was the case with identical blade 12, if a longitudinal line 
were to be drawn from point 46 through the center of opening 68, forward 
peripheral edge 52 of spur 40 would make an angle of approximately 70 
degrees. 
Lastly, referring now to FIG. 7, a sectional view taken through the upper 
portions of blades 12 and 14 of FIG. 1 is shown. Here, the overlapping of 
the blades is more clearly seen to show the safety factor which has been 
built into the invention, namely that the sharpened edges are protected 
from coming in contact with the hunter's fingers when the broadhead is in 
the closed position, and that the blade is protected from dulling by 
recessing the sharpened edge behind the partially chamferred edge of the 
opposite blade. In FIG. 7, blade 12 is shown with its sharpened edge 22 
recessed behind the partially chamferred edge 50 of blade 14. Similarly, 
sharpened edge 48 of blade 14 is recessed behind partially chamferred edge 
23 of blade 12. In the preferred embodiment, the following are 
representative of the angles the surfaces make, for example, sharpened 
edges (22 and 48) are 30 degree angles and partially chamferred edges (23 
and 50) are 45 degree angles, both angled relative to the flat top of 
bottom of the blades. As indicated earlier, the partially chamferred edge 
constitutes about 85% of the thickness of the blade and the right angle 
cut portion occupies about 15% of the thickness of the blade. This, of 
course, may be varied. In this configuration, so long as the blades are in 
the closed position shown in FIG. 1, the hunter may grab the tip of the 
broadhead without concern of being cut. Also, rubber band 20 may be pushed 
down over the two blades shown in FIG. 1 without being cut as it slides 
over the partially chamferred edges. 
While a preferred embodiment of the invention has been shown and described, 
it is appreciated that other embodiments of the invention are possible and 
that there is no intent to limit the invention by such disclosure, but 
rather, it is intended to cover all modifications and alternate 
embodiments falling within the spirit and scope of the invention as 
defined in the appended claims.