Crossbow having elongated draw length

• US 7,823,572 B2
• Filed: 10/22/2007
• Issued: 11/02/2010
• Est. Priority Date: 10/22/2007
• Status: Active Grant

• Current Assignee: Doris J. Anderson
• Original Assignee: Jeffrey R. Anderson
• Inventors: Anderson, Jeffrey R.
• Primary Examiner(s): RICCI, JOHN A
• Application Number:
  US11/975,769
• Publication Number:
  US 20090101126A1
• Time in Patent Office: 1,107 Days
• Field of Search: 124/25, 124/25.6
• US Class Current: 124/25
• CPC Class Codes: F41B 5/123 Compound crossbows
• CPC Class Codes: F41B 5/143 Arrow rests or guides
• CPC Class Codes: F41B 5/1469 Bow-string drawing or releasing devices F41B5/1473 takes precedence

Abstract

A novel embodiment of a crossbow (10) includes an elongated draw length and a rifle-type stock (134) with a tubular barrel (106) designed to shoot standard three-fletch arrows (120) with a three-blade hunting tip. When the main string (105) of the crossbow (10) is fully drawn and cocked, the string compression levers (110) that are pivoted so that the pulleys (113) on levers (110) engage the string (105) and deflect the string (105) toward the barrel (106) until the string compression levers 110 rest against the side of the barrel (106). The crossbow (10) has a draw length significantly longer than the draw length of a conventional crossbow of the same overall size, thereby providing a larger power stroke with less draw weight. In the other embodiments, the crossbow (20, 30) may include a barrel (106) with rectangular cross section for shooting shot filled sabots for bird hunting, small game hunting or trap shooting or a barrel (106) with a circular cross section for shooting paint-ball filled sabots for paint ball games.

Claims

1. A crossbow, comprising:

first and second limbs, each having first and second ends;

a riser to receive the first end of the first and second limbs;

a first cam with an axle to couple to the second end of the first limb;

a second cam with an axle to couple to the second end of the second limb;

a string extending between the first cam and the second cam;

a string release adapted to hold the string when the crossbow is cocked;

a stock having a bore end and a butt end, the stock including a pistol grip, a trigger coupled to the string release, and a barrel extending between the bore end and the butt end of the stock, the bore end of the stock coupled to the riser, the string release disposed near the butt end of the stock, and the barrel adapted to receive one of an arrow or sabot; and

first and second levers each coupled to the stock near the butt end and adapted to deflect the string toward the stock when rotated after the crossbow string is cocked and held by the string release.

2. The crossbow according to claim 1, wherein each of the first and second levers has a pulley for engaging the string.

3. The crossbow according to claim 1, wherein each of the first and second levers is L-shaped and has a pulley for engaging the string.

4. The crossbow according to claim 1, wherein the first and second cams are eccentric cams.

5. The crossbow according to claim 1, wherein the barrel has a rectangular cross section for receiving a sabot having a rectangular cross section.

6. The crossbow according to claim 1, wherein the barrel has a circular cross section for receiving a sabot having a circular cross section.

7. The crossbow according to claim 1, wherein the first and second cams are attached to the riser and the crossbow further includes a first pulley with an axle to couple to the second end of the first limb and a second pulley with an axle to couple to the second end of the second limb, and the string extending between the first cam, the first pulley, the second pulley, and the second cam.

8. A crossbow, comprising:

first and second limbs, each having first and second ends;

a riser to receive the first end of the first and second limbs;

a first cam with an axle to couple to the second end of the first limb;

a second cam with an axle to couple to the second end of the second limb;

a string extending between the first cam and the second cam;

a string release adapted to hold the string when the crossbow is cocked;

a stock having a bore end and a butt end, the stock including a pistol grip, a trigger coupled to the string release, and an arrow rest extending between the bore end and the butt end of the stock, the bore end of the stock coupled to the riser, the string release disposed near the butt end of the stock, and the arrow rest adapted to receive an arrow; and

first and second levers each coupled to the stock near the butt end and adapted to deflect the string toward the stock when rotated after the crossbow string is cocked and held by the string release.

9. The crossbow according to claim 8, wherein each of the first and second levers has a pulley for engaging the string.

10. The crossbow according to claim 8, wherein each of the first and second levers is L-shaped and has a pulley for engaging the string.

11. The crossbow according to claim 8, wherein the first and second cams are eccentric cams.

12. The crossbow according to claim 8, further including a cover extending from the butt end of the stock for covering a portion of an arrow near the butt end of the stock.

13. The crossbow according to claim 8, wherein the first and second cams are attached to the riser and the crossbow further includes a first pulley with an axle to couple to the second end of the first limb and a second pulley with an axle to couple to the second end of the second limb, and the string extending between the first cam, the first pulley, the second pulley, and the second cam.

14. A crossbow, comprising:

first and second split limbs, each having first and second ends;

a riser to receive the first end of the first and second split limbs;

a first cam with an axle to couple to the riser;

a second cam with an axle to couple to the riser;

a first pulley with an axle to couple to the second end of the first split limb;

a second pulley with an axle to couple to the second end of the second split limb;

a string extending between the first cam, the first pulley, the second pulley, and the second cam;

a string release adapted to hold the string when the crossbow is cocked;

a stock having a bore end and a butt end, the stock including a pistol grip, a trigger coupled to the string release, a shoulder rest disposed at the butt end of the stock, and an arrow rest extending between the bore end and the butt end of the stock, the bore end of the stock coupled to the riser, the string release disposed near the butt end of the stock, and the arrow rest adapted to receive an arrow; and

first and second levers each coupled to the stock near the butt end and adapted to deflect the string toward the stock when rotated after the crossbow string is cooked and held by the string release.

15. The crossbow according to claim 14, wherein each of the first and second levers has a pulley for engaging the string.

16. The crossbow according to claim 14, wherein each of the first and second levers is L-shaped and has a pulley for engaging the string.

17. The crossbow according to claim 14, wherein the first and second cams are eccentric cams.

18. The crossbow according to claim 14, further including a third pulley with an axle to couple to the second end of the first split limb, a fourth pulley with an axle to couple to the second end of the second split limb, and a harness string coupled between the riser, the third pulley and the second cam, and another harness string coupled between the riser, the fourth pulley and the first cam.

19. The crossbow according to claim 14, wherein the arrow rest is comprised of a barrel adapted to receive an arrow or sabot.

20. A crossbow, comprising:

first and second limbs, each having first and second ends;

a riser to receive the first end of the first and second limbs;

a first cam with an axle to couple to the second end of the first limb;

a second cam with an axle to couple to the second end of the second limb;

a string extending between the first cam and the second cam;

a string release adapted to hold the string when the crossbow is cocked;

a stock having a bore end and a butt end, the stock including a pistol grip, a trigger coupled to the string release, and an arrow rest extending between the bore end and the butt end of the stock, the bore end of the stock coupled to the riser, the string release disposed near the butt end of the stock, and the arrow rest adapted to receive an arrow; and

first and second pulleys each coupled to the stock near the butt end and adapted to deflect the string toward the stock when the crossbow string is cocked and held by the string release.

21. The crossbow according to claim 20, wherein the first and second cams are attached to the riser and the crossbow further includes a third pulley with an axle to couple to the second end of the first limb and a fourth pulley with an axle to couple to the second end of the second limb, and the string extending between the first cam, the first pulley, the second pulley, and the second cam.

22. A crossbow, comprising:

first and second limbs, each having first and second ends;

a riser to receive the first end of the first and second limbs;

a first cam with an axle to couple to the second end of the first limb;

a second cam with an axle to couple to the second end of the second limb;

a string extending between the first cam and the second cam;

a string release adapted to hold the string when the crossbow is cocked;

a stock having a bore end and a butt end, the stock including a pistol grip, a trigger coupled to the string release, and an arrow rest extending between the bore end and the butt end of the stock, the bore end of the stock coupled to the riser, the string release disposed near the butt end of the stock, and the arrow rest adapted to receive an arrow; and

means coupled to the stock near the butt end for deflecting the string toward the stock when the crossbow string is cocked and held by the string release.

23. A crossbow, comprising:

first and second limbs, each having first and second ends;

a riser to receive the first end of the first and second limbs;

a first cam with an axle to couple to the riser,

a second cam with an axle to couple to the riser;

a first pulley with an axle to couple to the second end of the first limb;

a second pulley with an axle to couple to the second end of the second limb;

a string extending between the first cam, the first pulley, the second pulley, and the second cam;

a string release adapted to hold the string when the crossbow is cocked;

a stock having a bore end and a butt end, the stock including a pistol grip, a trigger coupled to the string release, and an arrow rest extending between the bore end and the butt end of the stock, the bore end of the stock coupled to the riser, the string release disposed near the butt end of the stock, and the arrow rest adapted to receive an arrow; and

means coupled to the stock near the butt end for deflecting the string toward the stock when the crossbow string is cocked and held by the string release.