Plastic molded arrowhead and method

• US 5,137,282 A
• Filed: 01/07/1991
• Issued: 08/11/1992
• Est. Priority Date: 01/07/1991
• Status: Expired due to Fees

• Current Assignee: Folsom Sports Incorporated
• Original Assignee: Folsom Sports Incorporated
• Inventors: Collins, Guy R., Segar, Donald E.
• Primary Examiner(s): SHAPIRO, PAUL
• Application Number:
  US07/638,060
• Time in Patent Office: 582 Days
• Field of Search: 273/421, 273/422
• US Class Current: 473/583
• CPC Class Codes: F42B 6/08 Arrow heads; Harpoon heads

Abstract

An insert molded arrowhead having orthogonal primary and secondary blades and a method for manufacturing the arrowhead are disclosed. The primary and secondary blades have slots adjacent their forward and rearward ends which interfit to form a blade assembly. The blade assembly is placed in a mold and insert molded with plastic. The plastic interlocks the interfitting blades, forms wedging ridges along cutting edges laterally disposed on the blade assembly, and encircles a stem member extending rearwardly from the blade assembly, forming a connector portion for securing the arrowhead to an arrow shaft.

Claims

1. An arrowhead securable to an arrow shaft comprising:

a primary blade having a generally continuous outer periphery with a central opening formed therein, a forward portion with an apex and a rearward portion, a longitudinal axis extending from the apex to the rearward portion, a forward slot located in the forward portion, and a rearward slot located in rearward portion, and wherein the forward and rearward slots extend longitudinally axially and open interiorly into the central opening;

a secondary blade having a generally continuous outer periphery, a front portion, a back portion, a longitudinal axis extending from the front portion to the back portion, a front slot located in the front portion, a back slot located in the back portion, wherein the front and rear slots extend longitudinally axially and open exteriorly from the periphery and wherein the forward and front slots and the rearward and back slots cooperatively interfit to orthogonally locate the secondary blade within the central opening of the primary blade in an angularly related relation; and

plastic encapsulating the forward and front slots and the rearward and back slots wherein the secondary blade is fixedly secured to the primary blade.

2. The arrowhead as recited in claim 1 wherein the primary blade and the secondary blade are orthogonally disposed one another.

3. The arrowhead as recited in claim 1 wherein the primary blade further comprises a stem member extending axially rearwardly from the rearward portion and wherein the stem member is also encapsulated in plastic forming a shaft having a extension for securement with an arrow shaft.

4. The arrowhead as recited in claim 3 wherein the extension is threaded.

5. The arrowhead as recited in claim 1 wherein the periphery and the central opening of the primary blade are defined by a pair of side members extending rearwardly and laterally divergently from the apex and a pair of rearward members extending from the rear ends of side members laterally inwardly to the longitudinal axis, each side member having a sharpened cutting edge disposed on its laterally outward edge and vertical plastic wedging ridges spaced laterally inwardly and parallel to the cutting edge on each planar surface of the side member, the width of the wedging ridges being substantially less than the width of the primary blade.

6. The arrowhead as recited in claim 5 wherein at least one side member contains at least one side aperture wherein the wedging ridges interlock through the aperture about the planar surfaces of the side member.

7. The arrowhead as recited in claim 1 wherein the metal is a tempered hardened steel.

8. The arrowhead as recited in claim 1 wherein the plastic is "LEXAN".

9. An arrowhead for attachment to a shaft, the arrowhead comprising:

a central attaching hub and a planar blade, the attaching hub affixed to the blade and being adapted to attach to a shaft, the blade having a forward apex leading to two trailing diverging sharpened cutting edges, the arrowhead having at least one vertical wedging ridge juxtaposed and extending parallel along a cutting edge and spaced from the attaching hub, wherein the ridge provides increased thickness and wound enhancement.

10. The arrowhead as recited in claim 9 wherein the arrowhead has a vertical wedging ridge on each of the planar surfaces of the blade the wedging ridges juxtaposed and extending parallel along at least one cutting edge.

11. The arrowhead as recited in claim 10 further comprising at least one aperture in the blade through which the vertical wedging ridges interlock about the blade.

12. The arrowhead as recited in claim 9 wherein the wedging ridge is made of plastic.

13. A method of making an arrowhead comprising the steps of:

providing a planar primary blade having an enclosed central opening, a forward slot and a rearward slot, the slots extending along the longitudinal axis of the primary blade and opening into the central opening;

providing a planar secondary blade having a front and back slots extending along the longitudinal axis of the secondary blade and opening exteriorly;

wherein the forward slot and the front slot and the rearward slot and the back slot are cooperatively interfitting to secure the secondary blade in an angularly related relation within the primary blade; and

encapsulating with plastic the interfitting forward and front slots and the interfitting rearward and back slots to fixedly interlock the secondary blade within the primary blade.

14. The arrowhead as recited in claim 13 wherein the primary blade and the secondary blade are orthogonally disposed one another.

15. The method as recited in claim 13 further comprising the step of forming a vertical plastic wedging ridge on at least one planar surface of the primary blade, the ridge being spaced laterally inwardly and parallel along a cutting edge.

16. The method as recited in claim 15 wherein there is a stem member extending rearwardly from the rearward slot and encapsulating such stem member in plastic forming a shaft having a rearwardly extending extension for mounting to a an arrow shaft.

17. The method as recited in claim 16 wherein the extension is threaded.

18. An arrowhead for securement to an arrow shaft comprising, in combination:

a primary blade of generally triangular planar configuration having a central opening defining a continuous peripheral marginal portion having an apex at one end and a base at the opposite end;

a secondary blade of generally triangular planar configuration having a continuous peripheral marginal portion and received in the central opening of the primary blade in angularly related relations and connected therewith adjacent the apex and adjacent the base;

a resin molded in situ about the blades at their connection adjacent the apex and the base of the primary blade to lock the blades together and extending along the continuous peripheral marginal portion of one of the blades to provide increased thickness and wound enhancement; and

means at the base for connecting the arrowhead to an arrow shaft.

19. An arrowhead as recited in claim 18 wherein the resin extends along the continuous peripheral marginal portion of the primary blade adjacent the central opening.

20. An arrowhead as recited in claim 18 wherein said resin extends along the continuous peripheral marginal portion of the primary blade adjacent the central openings.

21. The invention defined by claim 18 characterized in that said resin is molded in situ along a continuous peripheral marginal portion adjacent said central opening to define an increased thickness for the blade.

22. The invention defined by claim 18 wherein said resin adjacent the base is shaped to provide a connection for an arrowshaft.