Synchronized compound archery bow

• US 7,441,555 B1
• Filed: 09/30/2005
• Issued: 10/28/2008
• Est. Priority Date: 09/30/2005
• Status: Expired due to Fees

• Current Assignee: Bowtech, Inc.
• Original Assignee: Larson Archery Company
• Inventors: Larson, Marlow W.
• Primary Examiner(s): Ricci; John
• Application Number:
  US11/241,030
• Time in Patent Office: 1,124 Days
• Field of Search: 124/25.6, 124/900
• US Class Current: 124/25.6
• CPC Class Codes: F41B 5/10 Compound bows compound crossbows F41B5/123
• CPC Class Codes: F41B 5/105 Cams or pulleys for compound bows

Abstract

A rigging structure for a compound archery bow includes first and second pulley assemblies, pivotally mounted on axles at tips of corresponding first and second limbs of a compound bow and interconnected by cables. Each pulley assembly includes a dynamic synchronizing component, and the rigging preferably also includes means for avoiding the usual leaning moment imposed upon the pulley assemblies by the cables of conventional riggings.

Claims

1. Rigging for a compound archery bow comprising:

first and second pulley assemblies, mounted to pivot on respective axles at tips of corresponding first and second limbs of a compound bow;

each assembly including;

a string pulley component with a non-circular peripheral string groove;

a cable pulley component with a non-circular peripheral cable take-up groove; and

a dynamic synchronizing component;

a bowstring with opposite ends connected to said first and second pulley assemblies such that, at rest condition of the bow, the peripheral string grooves are substantially occupied by wrapped bowstring;

a first cable segment, extending from the entry of the peripheral cable take-up groove of said first pulley assembly to the dynamic synchronizing component of said second pulley assembly; and

a second cable segment, extending from the entry of the peripheral cable take-up groove of said second pulley assembly to the dynamic synchronizing component of said first pulley assembly;

said first and second pulley assemblies being structured and arranged such that as said bowstring is pulled from its said rest position towards its drawn position, respective first ends of said first and second cable segments wrap onto the peripheral cable take-up grooves of said first and second pulley assemblies, respectively, and respective second ends of said first and second cable segments operably interact with the dynamic synchronizing components of said second and first pulley assemblies, respectively.

2. Rigging according to claim 1, wherein said dynamic synchronizing components are structured and arranged to apply force approximately equally at opposite sides of the string pulley components of said first and second pulley assemblies.

3. Rigging according to claim 1, wherein said dynamic synchronizing components each comprise a spooling surface arranged to turn with an associated string pulley.

4. Rigging according to claim 3, wherein said spooling surfaces are arranged to unwind cable as said bowstring is pulled.

5. Rigging according to claim 4, wherein respective said spooling surfaces are arranged to apply force approximately equally at opposite sides of the string pulley components of said first and second pulley assemblies.

6. Rigging according to claim 1, wherein the left to right sequence of said first pulley assembly is:

cable pulley component, string pulley component, dynamic synchronizing component and the left to right sequence of said second pulley assembly is;

dynamic synchronizing component, string pulley component;

cable pulley component.

7. Rigging according to claim 6, wherein the cable pulley component and the dynamic synchronizing component of each of said first and second pulley assemblies are spaced sufficiently to permit an arrow to be launched between said first and second cable segments.

8. Rigging according to claim 1, wherein each of said pulley assemblies includes a first cable pulley component disposed on the right side of a string pulley component and a second cable pulley component disposed on the left side of that string pulley component;

said first cable segment extending through a Y harness arrangement to said first and second cable pulley components of said first pulley assembly; and

said second cable segment extending through a Y harness arrangement to said first and second cable pulley components of said second pulley assembly.

9. Rigging for a compound archery bow comprising:

first and second pulley assemblies, mounted to pivot on respective axles at tips of corresponding first and second limbs of a compound bow;

each assembly including;

a string pulley component with a peripheral string groove;

a cable pulley component with a peripheral cable take-up groove; and

a dynamic synchronizing component comprising;

a first spooling surface, and

a second spooling surface,

said first and second spooling surfaces being positioned at opposite sides of said pulley assembly;

a bowstring with opposite ends connected to said first and second pulley assemblies such that, at rest condition of the bow, the peripheral string grooves are substantially occupied by wrapped bowstring;

a first cable segment, extending from the entry of the peripheral cable take-up groove of said first assembly, through a Y harness arrangement, to said first and second spooling surfaces of the synchronizing component of said second pulley assembly; and

a second cable segment, extending from the entry of the peripheral cable take-up groove of said second assembly, through a Y harness arrangement, to said first and second spooling surfaces of the synchronizing component of said first pulley assembly;

said first and second pulley assemblies being structured and arranged such that as said bowstring is pulled from its said rest position towards its drawn position, respective first ends of said first and second cable segments wrap onto the peripheral cable take-up grooves of said first and second pulley assemblies, respectively, and respective second ends of said first and second cable segments operably interact with the dynamic synchronizing components of said second and first pulley assemblies, respectively.

10. Rigging according to claim 9, wherein said peripheral string groove is non-circular in configuration.

11. Rigging according to claim 10, wherein said peripheral cable groove is non-circular in configuration, and said cable groove is out of registration with said string groove.

12. Rigging according to claim 9, wherein said peripheral cable groove is non-circular in configuration.

13. Rigging for a compound archery bow comprising:

first and second pulley assemblies, mounted to pivot on respective axles at tips of corresponding first and second limbs of a compound bow;

each assembly including;

a string pulley component with a non-circular peripheral string groove;

a cable pulley component with a non-circular peripheral cable take-up groove; and

a dynamic synchronizing component;

a bowstring with opposite ends connected to said first and second pulley assemblies such that, at rest condition of the bow, the peripheral string grooves are substantially occupied by wrapped bowstring;

a first cable segment, extending from the entry of the peripheral cable take-up groove of said first pulley assembly to the synchronizing component of said second pulley assembly; and

a second cable segment, extending from the entry of the peripheral cable take-up groove of said second assembly to the synchronizing component of said first pulley assembly;

said first and second pulley assemblies being structured and arranged such that as said bowstring is pulled from its said rest position towards its drawn position, respective first ends of said first and second cable segments wrap onto the peripheral cable take-up grooves of said first and second pulley assemblies, respectively, and respective second ends of said first and second cable segments are adjusted in length by operation of the dynamic synchronizing components of said second and first pulley assemblies, respectively; and

stabilization means for distributing at least half of the force applied by said second ends of said first and second cable segments to the sides of the respective pulley assemblies opposite said string grooves from said cable take-up grooves.

14. Rigging according to claim 13, wherein said stabilization means is structured and arranged to direct all of the force applied by said second ends of said first and second cable segments to the sides of the respective pulley assemblies opposite said string pulley component from said cable pulley components.

15. Rigging according to claim 13, wherein said dynamic synchronizing components each comprise a spooling surface arranged to turn with an associated string pulley.

16. Rigging according to claim 15, wherein said spooling surfaces are arranged to unwind cable as said bowstring is pulled.

17. Rigging according to claim 16, wherein respective said spooling surfaces are arranged to apply force approximately equally at opposite sides of the string pulley components of said first and second pulley assemblies.

18. Rigging according to claim 13, wherein the left to right sequence of said first pulley assembly is:

cable pulley component, string pulley component, dynamic synchronizing component and the left to right sequence of said second pulley assembly is;

dynamic synchronizing component, string pulley component;

cable pulley component.

19. Rigging according to claim 18, wherein the cable pulley component and the dynamic synchronizing component of each of said first and second pulley assemblies are spaced sufficiently to permit an arrow to be launched between said first and second cable segments.

20. Rigging according to claim 13, wherein each of said pulley assemblies includes a first cable pulley component disposed on the right side of a string pulley component and a second cable pulley component disposed on the left side of that string pulley component;

said first cable segment extending through a Y harness arrangement to said first and second cable pulley components of said first pulley assembly; and

said second cable segment extending through a Y harness arrangement to said first and second cable pulley components of said second pulley assembly.