Crossbow cam

• US 10,502,516 B2
• Filed: 11/29/2018
• Issued: 12/10/2019
• Est. Priority Date: 11/29/2017
• Status: Active Grant

• Current Assignee: Hunters Manufacturing Co Incorporated (Hunter's Manufacturing Company Incorporated)
• Original Assignee: Hunter's Manufacturing Company Incorporated
• Inventors: Bednar, Richard, Bednar, Phil
• Primary Examiner(s): Ricci, John A
• Application Number:
  US16/203,961
• Publication Number:
  US 20190162500A1
• Time in Patent Office: 376 Days
• CPC Class Codes: F41B 5/105 Cams or pulleys for compound bows
• CPC Class Codes: F41B 5/123 Compound crossbows

Abstract

Provided is a crossbow comprising a bow having: a riser having a first riser side and a second riser side; a first cam set having a first shaft, a first power cord cam of the first cam set, a bowstring cam, and a second power cord cam of the first cam set; a second cam set having a second shaft, a first power cord cam of the second cam set, a bowstring cam, and a second power cord cam of the second cam set; a first power cord engaged with the first power cord cam of the first cam set and the first riser side; a second power cord engaged with the first power cord cam of the second cam set and the second riser side; and a third power cord engaged between the second power cord cams.

Claims

1. A crossbow comprising

a bow having

a riser having

a first riser side and

a second riser side opposite the first riser side,

a first limb set

engaged to the first riser side, and

defining a first limb axis;

a second limb set,

engaged to the second riser side, and

defining a second limb axis parallel to the first limb axis;

a first cam set having

a first shaft defining and rotatable about a first cam axis, the first shaft engaged with the first limb set such that the first cam axis coincides with the first limb axis,

a first power cord cam of the first cam set operationally engaged with the first shaft to be rotatable about the first cam axis,

a bowstring cam of the first cam set operationally engaged with the first shaft to be rotatable about the first cam axis,

a second power cord cam of the first cam set operationally engaged with the first shaft to be rotatable about the first cam axis;

a second cam set having

a second shaft defining and rotatable about a second cam axis, the second shaft engaged with the second limb set such that the second cam axis coincides with the second limb axis,

a first power cord cam of the second cam set operationally engaged with the second shaft to be rotatable about the second cam axis,

a bowstring cam of the second cam set operationally engaged with the second shaft to be rotatable about the second cam axis,

a second power cord cam of the second cam set operationally engaged with the second shaft to be rotatable about the second cam axis;

an elongated first power cord having

a first end of the elongated first power cord operationally engaged with the first power cord cam of the first cam set, and

a second end of the elongated first power cord opposite the first end of the elongated first power cord operationally engaged with the first riser side;

an elongated second power cord having

a first end of the elongated second power cord operationally engaged with the first power cord cam of the second cam set, and

a second end of the elongated second power cord opposite the first end of the elongated second power cord operationally engaged with the second riser side;

an elongated third power cord having

a first end of the elongated third power cord operationally engaged with the second power cord cam of the first cam set, and

a second end of the elongated third power cord opposite the first end of the elongated third power cord operationally engaged with the second power cord cam of the second cam set; and

an elongated bowstring having

a first end of the elongated bowstring operationally engaged with the bowstring cam of the first cam set, and

a second end of the elongated bowstring opposite the first end of the elongated bowstring operationally engaged with the bowstring cam of the second cam set; and

wherein

the bow has a top side facing in a top direction,

the bowstring cam of the first cam set has a top side facing in a top direction that is the same as the top direction of the bow, and

the bowstring cam of the second cam set has a top side facing in a top direction that is the same as the top direction of the bow and has a bottom side opposite the top side.

2. The crossbow of claim 1, wherein

the first power cord cam of the first cam set, or

the bowstring cam of the first cam set, or

second power cord cam of the first cam set, or some combination thereof is movable in orientation, or position or both with respect to the first shaft.

3. The crossbow of claim 2, wherein

the first power cord cam of the second cam set, or

the bowstring cam of the second cam set, or

second power cord cam of the second cam set, or some combination thereof is movable in orientation, or position or both with respect to the second shaft.

4. The crossbow of claim 1, wherein

the first power cord cam of the first cam set,

the bowstring cam of the first cam set, and

second power cord cam of the first cam set are fixed in orientation and position with respect to the first shaft.

5. The crossbow of claim 4, wherein

the first power cord cam of the second cam set,

the bowstring cam of the second cam set, and

second power cord cam of the second cam set are fixed in orientation and position with respect to the second shaft.

6. The crossbow of claim 5, wherein

the first power cord cam of the first cam set is adjacent to the top side of the bowstring cam of the first cam set;

and

the first power cord cam of the second cam set is adjacent to the bottom side of the bowstring cam of the second cam set.

7. The crossbow of claim 5, wherein

the first power cord cam of the first cam set is adjacent to the top side of the bowstring cam of the first cam set;

and

the first power cord cam of the second cam set is adjacent to the top side of the bowstring cam of the second cam set.

8. The crossbow of claim 7, wherein the second power cord cam of the first cam set is a helical cam.

9. The crossbow of claim 8, wherein the second power cord cam of the second cam set is a helical cam.

10. The crossbow of claim 9, wherein the first power cord cam of the first cam set is a planar cam.

11. The crossbow of claim 10, wherein the first power cord cam of the second cam set is a planar cam.

12. A method of using a crossbow comprising

providing a crossbow having

a bow having

a riser having

a first riser side and

a second riser side opposite the first riser side,

a first limb set

engaged to the first riser side, and

defining a first limb axis;

a second limb set,

engaged to the second riser side, and

defining a second limb axis parallel to the first limb axis;

a first cam set having

a first shaft defining and rotatable about a first cam axis, the first shaft engaged with the first limb set such that the first cam axis coincides with the first limb axis,

a first power cord cam of the first cam set operationally engaged with the first shaft to be rotatable about the first cam axis,

a bowstring cam of the first cam set operationally engaged with the first shaft to be rotatable about the first cam axis,

a second power cord cam of the first cam set operationally engaged with the first shaft to be rotatable about the first cam axis;

a second cam set having

a second shaft defining and rotatable about a second cam axis, the second shaft engaged with the second limb set such that the second cam axis coincides with the second limb axis,

a first power cord cam of the second cam set operationally engaged with the second shaft to be rotatable about the second cam axis,

a bowstring cam of the second cam set operationally engaged with the second shaft to be rotatable about the second cam axis,

a second power cord cam of the second cam set operationally engaged with the second shaft to be rotatable about the second cam axis;

an elongated first power cord having

a first end of the elongated first power cord operationally engaged with the first power cord cam of the first cam set, and

a second end of the elongated first power cord opposite the first end of the elongated first power cord operationally engaged with the first riser side;

an elongated second power cord having

a first end of the elongated second power cord operationally engaged with the first power cord cam of the second cam set, and

a second end of the elongated second power cord opposite the first end of the elongated second power cord operationally engaged with the second riser side;

an elongated third power cord having

a first end of the elongated third power cord operationally engaged with the second power cord cam of the first cam set, and

a second end of the elongated third power cord opposite the first end of the elongated third power cord operationally engaged with the second power cord cam of the second cam set; and

an elongated bowstring having

a first end of the elongated bowstring operationally engaged with the bowstring cam of the first cam set, and

a second end of the elongated bowstring opposite the first end of the elongated bowstring operationally engaged with the bowstring cam of the second cam set; and

wherein

the bow has a top side facing in a top direction,

the bowstring cam of the first cam set has a top side facing in a top direction that is the same as the top direction of the bow, and

the bowstring cam of the second cam set has a top side facing in a top direction that is the same as the top direction of the bow and has a bottom side opposite the top side; and

moving the bowstring between a cocked position and an uncocked position.

13. The method of claim 12, wherein

the first power cord cam of the first cam set, or

the bowstring cam of the first cam set, or

second power cord cam of the first cam set, or some combination thereof is movable in orientation, or position or both with respect to the first shaft.

14. The method of claim 13, wherein

the first power cord cam of the second cam set, or

the bowstring cam of the second cam set, or

second power cord cam of the second cam set, or some combination thereof is movable in orientation, or position or both with respect to the second shaft.

15. The method of claim 12, wherein

the first power cord cam of the first cam set,

the bowstring cam of the first cam set, and

second power cord cam of the first cam set are fixed in orientation and position with respect to the first shaft.

16. The method of claim 15, wherein

the first power cord cam of the second cam set,

the bowstring cam of the second cam set, and

second power cord cam of the second cam set are fixed in orientation and position with respect to the second shaft.

17. The method of claim 16, wherein

the first power cord cam of the first cam set is adjacent to the top side of the bowstring cam of the first cam set;

and

the first power cord cam of the second cam set is adjacent to the bottom side of the bowstring cam of the second cam set.

18. The method of claim 16, wherein

the first power cord cam of the first cam set is adjacent to the top side of the bowstring cam of the first cam set;

and

the first power cord cam of the second cam set is adjacent to the top side of the bowstring cam of the second cam set.

19. The method of claim 18, wherein

the second power cord cam of the first cam set is a helical cam;

the second power cord cam of the second cam set is a helical cam;

the first power cord cam of the first cam set is a planar cam; and

the first power cord cam of the second cam set is a planar cam.