Powerstroke crossbow

• US 7,836,871 B2
• Filed: 01/17/2007
• Issued: 11/23/2010
• Est. Priority Date: 01/17/2007
• Status: Active Grant

• Current Assignee: James J. Kempf
• Original Assignee: James J. Kempf
• Inventors: Kempf, James J.
• Primary Examiner(s): RICCI, JOHN A
• Application Number:
  US11/654,418
• Publication Number:
  US 20080168969A1
• Time in Patent Office: 1,406 Days
• Field of Search: 124/23.1, 124/24.1, 124/25, 124/25.6
• US Class Current: 124/25
• CPC Class Codes: F41B 5/123 Compound crossbows
• CPC Class Codes: F41B 5/1469 Bow-string drawing or releasing devices F41B5/1473 takes precedence

Abstract

A crossbow having an increased powerstroke and reduced noise. The powerstroke is increased by inverting the limb orientation from the standard crossbow arrangement and locating string guides at least partially forward and rearward of the ends of the limbs. The bowstring is drawn from the tops of the string guides to maximize the powerstroke, reducing noise and increasing the retained and delivered energy over existing crossbows.

Claims

1. A shooting bow comprising:

(a) a frame;

(b) a first limb;

(c) a second limb;

(d) wherein said first limb and said second limb are coupled to said frame in a manner in which said first limb and said second limb extend outwardly away from one another in a direction of shooting;

(e) a first string guide journaled to said first limb at a first point;

(f) a second string guide journaled to said limb at a second point;

(g) wherein said first point is located no more than ninety-five centimeters from said second point;

(h) a first string coupled to said first string guide and to said second string guide;

(i) a second string coupled from a first contact on said first string guide forward of said first point to a second contact on said second string guide forward of said second point;

(j) a locking assembly configured to receive said second string;

(k) a trigger coupled to said locking assembly; and

(l) a rail coupled to said frame and configured to receive a majority of a projectile forward of said locking assembly when said locking assembly is in receipt of said second string.

2. The shooting bow of claim 1, wherein said first point is located no more than eighty-five centimeters from said second point.

3. The shooting bow of claim 2, wherein said locking assembly is configured to receive said second string at a cocked position at least thirty-five centimeters from a resting position of said second string.

4. The shooting bow of claim 2, wherein said locking assembly is configured to receive said second string at a cocked position at least forty centimeters from a resting position of said second string.

5. The shooting bow of claim 2, wherein said locking assembly is configured to receive said second string at a cocked position at least forty-five centimeters from a resting position of said second string.

6. The shooting bow of claim 1, wherein said locking assembly is configured to receive said second string at a cocked position at least thirty-five centimeters from a resting position of said second string.

7. The shooting bow of claim 1, wherein said locking assembly is configured to receive said second string at a cocked position at least forty centimeters from a resting position of said second string.

8. The shooting bow of claim 1, wherein said locking assembly is configured to receive said second string at a cocked position at least forty-five centimeters from a resting position of said second string.

9. The shooting bow of claim 8, wherein said second string guide is a pulley.

10. The shooting bow of claim 1, wherein said first string guide is a cam.

11. A shooting bow comprising:

(a) a frame;

.

(b) a first limb;

(c) a second limb;

(d) a first string guide journaled to said first limb at a first point in a manner in which at least a portion of said first string guide extends at least partially forward of, and through, said first limb;

(e) a second string guide journaled to said second limb in a manner in which at least a portion of said second string guide extends forward of, and through, said second limb;

(f) a string coupled from a forward portion of said first string guide to a forward portion of said second string guide;

(g) wherein said first journaling means is located no more than ninety-five centimeters from said second journaling means;

(h) a locking assembly configured to receive said string; and

(i) a trigger coupled to said locking assembly.

12. The shooting bow of claim 11, wherein said first point is located no more than eighty-five centimeters from said second point.

13. The shooting bow of claim 12, wherein said locking assembly is configured to receive said second string at a cocked position at least thirty-five centimeters from a resting position of said second string.

14. The shooting bow of claim 12, wherein said locking assembly is configured to receive said second string at a cocked position at least forty centimeters from a resting position of said second string.

15. The shooting bow of claim 12, wherein said locking assembly is configured to receive said second string at a cocked position at least forty-five centimeters from a resting position of said second string.

16. The shooting bow of claim 11, wherein said locking assembly is configured to receive said second string at a cocked position at least thirty-five centimeters from a resting position of said second string.

17. The shooting bow of claim 11, wherein said locking assembly is configured to receive said second string at a cocked position at least forty centimeters from a resting position of said string.

18. The shooting bow of claim 11, wherein said locking assembly is configured to receive said second string at a cocked position at least forty-five centimeters from a resting position of said string.

19. A shooting bow system comprising:

(a) a frame having a front and a back;

(b) a first limb;

(c) a second limb;

(d) wherein said first limb and said second limb are coupled to said frame in a manner in which said first limb and said second limb diverge from one another in a forward direction;

(e) a projectile having a front and a back;

(f) a first string guide journaled to said first limb;

(g) a second string guide journaled to said second limb;

(h) a projectile mounted on said frame;

(i) a string extending from said first string guide to a point behind at least one-half the length of said projectile, and engaged with said second string guide; and

(j) wherein said first string guide is journaled to said first limb at a first point no more than ninety-five centimeters from a second point at which said second string guide is journaled to said second limb.

20. The shooting bow of claim 19, wherein said first point is located no more than eighty-five centimeters from said second point.