Means of increasing mechanical advantage in asynchronous compound bows

• US 6,792,931 B1
• Filed: 11/12/2003
• Issued: 09/21/2004
• Est. Priority Date: 11/12/2003
• Status: Expired due to Fees

• Current Assignee: John G. Schaar
• Original Assignee: John G. Schaar
• Inventors: Schaar, John G.
• Primary Examiner(s): Ricci, John A.
• Application Number:
  US10/705,712
• Time in Patent Office: 314 Days
• Field of Search: 124/23.1, 124/25.6, 124/86, 124/88, 124/900
• US Class Current: 124/25.6
• CPC Class Codes: F41B 5/10 Compound bows compound crossbows F41B5/123

Abstract

The invention defines alternate means of increasing mechanical advantage in asynchronous compound bows of a type generally defined in U.S. Pat. No. 6,470,870, which employ dual planar compound pulleys as the primary leverage inducing agent, and at least one non-coplanar actuator section rigging. Additional pulley elements are added to the primary limb, or PRES member extension, or both, in a variety of possible configurations, in a manner that provides greater leverage than would be present in prior art asynchronous compound bows of the type defined generally by U.S. Pat. No. 6,470,870.

Claims

1. A compound bow having asynchronous primary limb and primary pulley-actuator operation, wherein no actuator segment, except the bowstring section used to draw the bow, extends past the vertical center of the bows riser segment, which asynchronous operation incorporates a minimum of one dual-planar primary leverage inducing pulley, and a pulley-return-energy-storage-source (PRES) incorporated in the bows overall configuration at (at) least one end of the bow, said bow incorporating in addition to the primary leverage inducing pulley mounted proximate the end of at least one of the bows primary limbs, a minimum of one additional simple intermediate pulley incorporated in the PRES extension located at the same end of the bow, which intermediate pulley engages an extended actuator length coming from the primary leverage inducing pulley, and which extended actuator length thereafter continues on to and is terminated at a point intermediate the ends of the primary limb mounted on the same end of the bows riser section that the primary pulley that the extended actuator length emanates from is mounted at.

2. A compound bow having asynchronous primary limb and primary pulley-actuator operation, wherein no actuator segment, except the bowstring section used to draw the bow, extends past the vertical center of the bows riser segment, which asynchronous operation incorporates a minimum of one dual-planar primary leverage inducing pulley, and a pulley-return-energy-storage-source (PRES) incorporated in the bows overall configuration at (at) least one end of the bow, said bow incorporating in addition to the primary leverage inducing pulley mounted proximate the end of at least one of the bows primary limbs, a minimum of one additional simple intermediate pulley incorporated in the PRES extension located at the same end of the bow, which intermediate pulley engages an extended actuator length coming from the primary leverage inducing pulley, and which extended actuator length thereafter continues on to and is terminated at a point on the bows riser section at the same end of the bows riser section that the primary pulley that the extended actuator length emanates from is mounted at.

3. A compound bow having asynchronous primary limb and primary pulley-actuator operation, wherein no actuator segment, except the bowstring section used to draw the bow, extends past the vertical center of the bows riser segment, which asynchronous operation incorporates a minimum of one dual-planar primary leverage inducing pulley, and a pulley-return-energy-storage-source (PRES) incorporated in the bows overall configuration at (at) least one end of the bow, said bow incorporating in addition to the primary leverage inducing pulley mounted proximate the end of the bows primary limb at the same end of the bow, a minimum of one additional simple intermediate pulley incorporated in the PRES extension located at the same end of the bow, which intermediate pulley engages an extended actuator length coming from the primary leverage inducing pulley, and which extended actuator length thereafter continues on to and engages a minimum of one more intermediate pulley that is fixed in place at a point intermediate the ends of the primary limb at the same end of the bow, and which extended actuator length then continues to a termination point intermediate the ends of the PRES extension located at the same end of the bow that the primary pulley that the extended actuator length emanates from is mounted at.

4. A compound bow having asynchronous primary limb and primary pulley-actuator operation, wherein no actuator segment, except the bowstring section used to draw the bow, extends past the vertical center of the bows riser segment, which asynchronous operation incorporates a minimum of one dual-planar primary leverage inducing pulley, and a pulley-return-energy-storage-source (PRES) incorporated in the bows overall configuration at (at) least one end of the bow, said bow incorporating in addition to the primary leverage inducing pulley mounted proximate the end of the bows primary limb at the same end of the bow, a minimum of one additional simple intermediate pulley incorporated in the PRES extension located at the same end of the bow, which intermediate pulley engages an extended actuator length coming from the primary leverage including pulley, and which extended actuator length thereafteron to and engages a minimum of one more intermediate pulley that is fixed in place ata point intermediate the ends of the primary limb at the same end of the bow, and which extended actuator length then continues to a termination point on the bows riser section, said termination point being located at the same end of the bow that the primary pulley that theextended actuator length emanates from is mounted at.