US3398960A

US3398960A - One-piece arrowhead with cutting blades

Info

Publication number: US3398960A
Application number: US529367A
Authority: US
Inventors: Jr Cornelius F Carroll
Original assignee: Cornelius F. Carroll Jr.
Current assignee: CORNELIUS F CARROLL JR
Priority date: 1966-02-23
Filing date: 1966-02-23
Publication date: 1968-08-27
Anticipated expiration: 1985-08-27

Description

1968 c. F. CARROLL, JR 3,3989% ONE-PIECE ARROWHEAD WITH CUTTING BLADES Filed Feb. 23, 1966 2 Sheets-Sheet 1 INVENTOR.

arm; J'r:

A7' TOR/VEYS g- 1968 c. F. CARROLL, JR 3,398,96fl

ONE-PIECE ARROWHEAD WITH CUTTING BLADES Filed Feb. 23, 1966 2 Sheets-Sheet 2 ATTORNEYS United States Patent 3,398,960 ONE-PIECE ARROWHEAD WITH CUTTING BLADES Cornelius F. Carroll, .Ir., 1310 Tuxedo, Parma, Ohio 44134 Filed Feb. 23, 1966, Ser. No. 529,367 10 Claims. (Cl. 273-106.5)

ABSTRACT OF THE DISCLOSURE An arrowhead blade structure which may be formed from a single piece of metal, indexed and locked to the projectile shaft; the blade structure being readily detach able and reversible in position on the shaft.

The detachability of the blade structure which I have developed permits a single type shaft to be fitted with a variety of cutting blades varying in style, design and pur pose thereby affording the archer with a great deal of selectivity, with the minimum amount of equipment.

It is therefore an object of invention to provide a plurality of differently shaped heads that can be easily detached and reversed in position on the projectile shaft.

This and other objects of invention will be apparent from the following specification and drawings in which:

FIGURE 1 is a side view of a single metal piece which has been cut to form one particular type of blade;

FIGURE 2 is a side view of the blades formed from the single piece of metal illustrated in FIGURE 1;

FIGURE 3 is a perspective view of the blade structure formed from the metal piece of FIGURES l and 2;

FIGURE 4 is a perspective view of the blade structure of FIGURE 3 inserted on an indexed projectile;

FIGURE 5 is a side view of the broad-head type of blade forming metal piece;

FIGURE 6 is a perspective view of the broad-head formed blade;

FIGURE 7 is a perspective view of the blade structure and projectile illustrating one type of indexing and locking feature;

FIGURE 8 is a perspective view of another type of locking and indexing structure;

FIGURE 9 is a perspective view of the partially formed piece of metal which forms a blade structure against flying game;

FIGURE 10 is a perspective view of the metal piece of FIGURE 9 showing the next step in forming the completed blade;

FIGURE 11 is a perspective view of the completed blade of FIGURE 9, mounted on the projectile;

FIGURE 12 is a section view taken along section lines 1212 of FIGURE 7, illustrating the locking and indexing structure.

The first step in producing the blade structure is to cut the metal to the appropriate shape. FIGURE 1 illustrates one type of blade structure design, which I have found to be particularly effective. Blade structure 2 is symmetrical above the horizontal axis, and therefore the blades 4 are symmetrical. After the single piece of metal is cut to the desired shape, the blades are formed by bending sections 4 along the cut lines 6 as shown in FIGURE 2. The blade structure 2 is then rolled to the configuration illustrated in FIGURE 3. After rolling, the blades are tempered to produce an inherent spring tension blade structure.

The final shape of the blade structure is illustrated in FIGURE 3. Blades 4 are symmetrically positioned at 90 angles around the longitudinal axis. Peripheral shaft portions 5 are spring tensioned as a result of the heat treating process. By grasping the blades and spreading them apart,

3,398,960 Patented Aug. 27, 1968 that is, by increasing the space 8 between portions 5, the

blade structure 2 may be fitted to projectile 9, as illustrated in FIGURE 4. Release of force on the blades when properly positioned on shaft 12, will cause the portions to return to their initial circular position because of the spring tensor.

Projectile 9 comprises a spike point section 10 and a shaft portion 12, with raised up

lip sections

14 and 16. The blade structure 2 is designed to fit between the

lip sections

14 and 16, lengthwise on shaft 12. Raised portions 7 provide an indexing and locking mechanism on shaft 12. Thus, the blade structure 2 is positioned on shaft 12, so that the raised portions 7 provide a guide for space 8. When space 8 is fitted about raised portions 7 so that they are co-extensive, tension on the blades is released thereby locking the blade structure in proper position on the shaft. The blade structure is thus properly positioned so that it cannot revolve around shaft 16, because of upraised portions 7.

Blades 4, illustrated in FIGURES 14, comprise four blades spaced at intervals around the peripheral section 5. The arms 17 and 17' of each blade form a 90 angle as illustrated in FIGURE 3.

Also, as shown in FIGURE 4, the blades 4 made an angle with the shaft of the projectile and are set back on the projectile so that point 10 primarily provides penetration into the animal. This is quite different from conventional arrowheads wherein the blades must provide the primary penetration, thereby making it necessary for stilfness for sufficient penetration.

The blades which I have developed, are unique in that they are used primarily for cutting rather than for penetration. Instead the spike point 10 of the projectile produces the penetration. Thus the blades are set in a recess on shaft 12 to the rear of penetrating spike point 10. The blades which I have developed will penetrate to some extent, the angle which the blades make with the shaft determining the penetrating effect of the blades. Thus, the greater the angle, the greater the penetration. However, my blades have the primary function of cutting flesh, arteries, and veins to cause hemorrhage to kill the animal.

The type of blade utilized, and the angle that the blade makes with the projectile may be varied depending upon the type of game being hunted. Also, the angle between the blade arms may be varied. For example, it will be necessary to use blades of greater penetrability when hunting heavy skinned animals such as pig, than when hunting thinner boned and skinned animals, such as deer.

FIGURES 5 and 6 illustrate a broad-head species of blade construction, which may also be formed from one piece of metal 20. The arms of blades 22 are unequal in width and length and form an acute angle. This type of blade has a wide cutting area relative to the blades illustrated in FIGURES 1-4. Again, it is fitted onto the shaft 12 as illustrated in FIGURE 4, with spike point 10 providing primary penetration of the game.

It is thus possible for the blade construction I have devised to be thinner, and have a wider cutting area than any other four-bladed point on the market, without sacrificing weight and penetration. Also, the lesser angle of the blades cutting angle coupled with the fact that the shorter length blades can be set back on the spike point, creates a guiding system similar to a missiles fins, virtually eliminating wind planing. The small amount of fiat surfaces exposed minimizes wind resistance and noise that is created with many conventional arrowheads.

Thus, an arrowhead comprising a spike point to initially break through the hide and bone of the animal before the cutting edges come in contact to cut into the game, is superior to conventional arrowheads. My blades create the least amount of drag, and allow the sharp edges of the blade which havent been used to puncture the bone, to cut through more flesh, arteries, and veins, thereby producing a sharper cut and thus a more effective blow to game. In effect, it produces a larger and sharper opening into the game, and causes hemorrhage at a faster rate, thereby bringing more sudden and sure death to any game animal.

Since the blades are symmetrical and detachable, they may be reversed in position on the shaft, thereby providing double the cutting life, as compared to a conventional blade. Also my removable blade structure results in an easy system for interchanging cutting blades differing in style, design, purpose etc. Thus, different types of blades, as for example illustrated in FIGURES 3, 6 and 11, may be fitted onto the arrow shaft, thereby producing a variety of cutting points with a minimum number of parts. When the blade device is disassembled from the projectile, the projectile may be used as a practice, or field point.

The spring tension system is particularly desirable, because it enables the easy attachment of the blades to a projectile as illustrated in FIGURE 4. To attach the blade structure to the arrow shaft 12, it is only necessary to bend the blades apart, and fit them over shaft 12. To remove the 'blade from the shaft, it is merely necessary to grasp blades A and B (see FIGURE 3), and spread them apart. It is not necessary to spread the blades too far, and the shaft may then be pulled from between the blades.

Another important feature of my invention is the indexing and locking structure by which the blade may be securely and properly positioned on the projectile shaft. FIGURE 4 illustrates one type of indexing and locking feature in which raised portions 7 are integral with the shaft to properly position and lock the blade structure space 8.

FIGURES 5 and 6 illustrate another type in which

tabs

26 and 26 are integral with the metal piece from which the blades are formed.

The projectile illustrated in FIGURE 7 is provided with

slots

44 and 46 in lip portions 42' and 42 respectively, on opposite sides of the shaft (180 apart). Also, the shaft defines grooves 48 on each side of the slot 46, and connecting therewith. When it is desired to fit the blade illustrated in FIGURES 5 and 6 onto the shaft illustrated in FIGURE 7, tab '26 is fitted into slot 44 and force is applied to blades 22 to force tabs 26 together. When they are properly positioned in slot 46, release of the force causes upper tabs 26 to extend by the spring tensor into grooves 48. Thus, the blade device is securely positioned and locked on the projectile shaft. This is particularly desirable, since it prevents movement of the blades when the arrow is shot, thereby producing a more accurate shot. It also effects proper positioning of the blades on the projectile.

To remove the blade the reverse is carried out. That is, force is applied to remove the tabs 26 from grooves 48, and out of slot 46.

Variations of the indexing and locking features are illustrated in FIGURES 1 and 2, in which four tabs, 3, integral with the blade structure, are shown. In this species,

slots

46 and 44 are defined by

lips

42 and 42 on the same side of the shaft opposite one another. Tabs 3 are fitted into the slots by applying force to the blades, forcing sides 5 together. When they are properly positioned within the slots, tension is released, thereby securely locking and positioning the blades on the shaft.

Another species of the invention entails using a blade device having two tabs 34, as illustrated in FIGURE 7, opposite one another in the center of the peripheral ends 33. As in the species illustrated in FIGURES l and 2, the arrowhead is then provided with two

slots

46 and 44 on the same side of the shaft, opposite one another, into which indexing and locking tabs 34 are fitted. Again, when they are properly positioned on the arrow shaft, tension on the blades is released, enabling the natural 4 spring tension of the blade device to lock the blade device securely onto the arrow shaft.

The various species of blade structures may be used with any of the indexing and locking structures described for maximum variability.

For example, FIGURES 9-11 illustrate another species of blade for killing flying game. The blades 50 are formed from a single piece of metal which is flanged at ends 56. The single piece of metal is folded in half-FIGURE 10, and the blades are then bent to the configuration illustrated in FIGURE 11. Flange sections 56 may be provided with the indexing and locking features heretofore described, and is then mounted on projectile 58. Alternatively, projectile shaft 60 may be indexed as illustrated in FIGURE 4.

Steel is preferably used to form the blades, but the invention is not limited to this. I have developed an arrowhead that provides the following:

A. One-piece detachable reversible cutting edge, spring Having thus described by invention I claim the following:

1. An arrowhead comprising:

A. a blade structure comprising a single piece of metal having sides and ends, said ends being circularly bent slightly less than 360 so that the sides do not touch,

B. said single piece of metal defining a plurality of similar blades between the ends thereof,

C. said metal forming a spring tension element so that a force greater than the force exerted by the spring tension element must be exerted to force said sides from their normal position; and

D. at least one tab integral with the blade structure at each end of said blade structure to form an indexing and locking means with co-acting interfitting structures on the projectile shaft.

2. The arrowhead as described in claim 1, said arrowhead further comprising a spike point section, and a shaft section to detachably receive said blade structure, said shaft section further defining slots into which said tabs may be securely positioned, for locking and indexing said blade structure on said projectile.

3. The arrowhead as described in claim 2 wherein said blade structure is reversible in position on said projectile.

4. An arrowhead comprising:

D. each of said blades comprising two arms integral with the blade structure, said arms forming a angle, the outer edges of said arms being sharpened.

5. The arrowhead as described in claim 4 wherein said arms form a right triangle, and wherein said arms form an angle of with an axis extending from end to end of said blade structure.

6. The blade structure as described in claim 4 wherein said arms form an acute angle, and wherein one of the arms of each blade is longer and thicker than the other arm.

7. The arrowhead as described in claim 3 wherein said projectile shaft comprises lips sections at each end thereof,

said lip sections defining slots into which the corresponding tabs on said blade structure are securely fitted thereby forming an indexing and locking structure.

8. The arrowhead as described in claim 7 wherein there is one tab located in the middle of each of said ends, and wherein said lips on said shaft each define a slot opposite one another on the same side of the shaft, into which the tabs may be securely fitted.

9. The arrowhead as described in claim 7 wherein each end comprises two tabs located at the outer extermities thereof, and wherein the lips of said shaft each define a slot into which corresponding tabs on each end of said blade structure are securely fitted.

10. The blade structure as described in claim 7 wherein one end of said blade structure defines two tabs located at References Cited UNITED STATES PATENTS 1,604,713 10/1926 Norlund 273-106.5

ANTON O. OECHSLE, Primary Examiner.

P. SHAPIRO, Assistant Examiner.