Multi-bladed expandable broadhead

• US 8,272,979 B1
• Filed: 12/06/2010
• Issued: 09/25/2012
• Est. Priority Date: 12/04/2009
• Status: Active Grant

• Current Assignee: Tog-IP, LLC
• Original Assignee: Gary L. Cooper
• Inventors: Cooper, Gary L
• Primary Examiner(s): Ricci, John
• Application Number:
  US12/961,306
• Time in Patent Office: 659 Days
• Field of Search: 473/583, 473/584
• US Class Current: 473/583
• CPC Class Codes: F42B 6/08 Arrow heads; Harpoon heads

Abstract

An aerodynamic multi-bladed expandable broadhead with rearward mounted overlapping blades with greater in-flight blade angles along with substantially perpendicular blade edges relative to the arrowhead body. Position of blades in flight guarantees they will always make a lethal cut on contact with an animal even before expansion. Greater in-flight blade angle means less force to open blades on hide guaranteeing expansion, and minimal rotation of blades to the penetration position results in a maximum entry cut and greater penetration. By expanding the distance between the blade edge and pivot a stronger blocky blade is produced. Geometry dictates during entry when blades hit bone on angle shots arrow direction will favorably remain in its intended lethal path to an animal.

Claims

1. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward pointed end, the body having at least one slot; and

b. at least two overlapping blades housed in said slot during flight, the blades being rotatably mounted in the slot to rotate rearwardly during impact with a target or game, each said blade having a generally straight main cutting edge oriented at an angle of 90°

±

40°

relative to said axis in flight.

2. The broadhead of claim 1 comprising a pivot entirely behind the main cutting edge in flight, the distance from the pivot to the nearest point on the cutting edge of each blade being at least 50% as long as the distance from said point to a distal end of said blade.

3. The broadhead of claim 2 wherein said distance from the pivot to the nearest point on the cutting edge of each blade is at least 0.25″

.

4. The broadhead of claim 1 wherein each of said blade main cutting edges is oriented 90°

±

15°

relative to said axis in flight.

5. The broadhead of claim 1 wherein each blade has cutting edge ends extending out both sides of said slot in flight.

6. The broadhead of claim 1 wherein each blade has a pivot base with a first portion which contacts the arrowhead body limiting the rotation of the blade in a closed flight position and a second portion which contacts the arrowhead body limiting the rotation of the blade in an open impact position.

7. The broadhead of claim 1 wherein a resilient band is constrained around the body and the blades and positions the blades in a closed position in flight.

8. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward pointed end, the body having at least one slot; and

b. at least two overlapping blades housed in said slot during flight, the blades being rotatably mounted in the slot to rotate around a pivot point rearwardly from a closed flight position to an open stop position during impact with a target or game, the open stop position being determined by stop structure on the body and on each said blade, each said blade having a main cutting edge with a distal end, a line from the distal end to the pivot point when the blade is in its open stop position forming an angle of 90°

±

20°

with said axis, wherein the main cutting edge forms an angle of 45°

±

15°

with said axis when the blade is in its open stop position.

9. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward pointed end, the body having at least one slot; and

b. at least two overlapping blades housed in said slot during flight, the blades being rotatably mounted in the slot to rotate around a pivot point rearwardly from a closed flight position to an open stop position during impact with a target or game, the open stop position being determined by stop structure on the body and on each said blade, each said blade having a main cutting edge with a distal end, a line from the distal end to the pivot point when the blade is in its open stop position forming an angle of 90°

±

20°

with said axis, wherein the distance between distal ends of the main cutting edges in closed flight position is between 1.0″ and

1.5″ and

wherein the distance between said distal ends in open impact position is between 1.1 and 2.0 times the distance in closed flight position.

10. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward pointed end, the body having at least one slot; and

b. at least two overlapping blades housed in said slot during flight, the blades being rotatably mounted in the slot to rotate around a pivot point rearwardly from a closed flight position to an open stop position during impact with a target or game, the open stop position being determined by stop structure on the body and on each said blade, each said blade having a main cutting edge with a distal end, a line from the distal end to the pivot point when the blade is in its open stop position forming an angle of 90°

±

20°

with said axis, wherein the distance between said distal ends in open impact position is at least 95% of the maximum distance between said distal ends as they rotate rearwardly.

11. The broadhead of claim 10 wherein the distance between said distal ends in open impact position is at least 98% of the maximum distance between said distal ends as they rotate rearwardly.

12. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward end having a point, the body having at least one slot extending through it;

b. at least two overlapping blades housed in said slot in a fixed closed flight position, the blades being rotatably mounted in the slot to rotate rearwardly around a pivot point to a fixed open stop position during impact with a target or game, each said blade having a main cutting edge;

characterized in that in the closed flight position

at least a portion of the main cutting edge is exposed, spaced at least 0.25″

behind the point,

the angle of a line through the blade tip and the pivot is 45°

±

15°

in relation to the axis and

the angle of the cutting edge is 90°

±

40°

relative to the axis.

13. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward pointed end, the body having at least one slot; and

b. at least one blade housed in said slot during flight, the blade being rotatably mounted by a pivot in the slot to rotate rearwardly from a closed flight position to an open impact penetration position during impact with a target or game, said blade having a main cutting edge, a line through the distal end of said main cutting edge and said pivot forming an angle with the axis of 45°

±

15 in said closed flight position and forming an angle with the axis of 90°

±

15°

in said open penetration position.

14. A blade for a mechanical broadhead, the blade comprising a main cutting edge and a pivot, the distance from the pivot to the nearest point on the main cutting edge being at least 50% as long as the distance from said point to a distal end of said blade.

15. The blade of claim 14 wherein the blade comprises a generally triangular web between the main cutting edge and the pivot.

16. A mechanical broadhead comprising:

a. an arrowhead body having a central longitudinal axis, the body having a rearward end that attaches to an arrow shaft and a forward pointed end, the body having at least one slot; and

b. at least one blade housed in said slot during flight, the blade being rotatably mounted by a pivot in the slot to rotate rearwardly from a closed flight position to an open impact penetration position during impact with a target or game, said blade having a main cutting edge, at least a portion of the main cutting edge being exposed in the closed flight position, the distance from the pivot to the nearest point on the main cutting edge being at least 50% as long as the distance from said point to a distal end of said blade.

17. The broadhead of claim 16 wherein the blade comprises a generally triangular web between the main cutting edge and the pivot.