High energy limb tip cam pulley archery bow

  • US 4,739,744 A
  • Filed: 11/01/1982
  • Issued: 04/26/1988
  • Est. Priority Date: 11/01/1982
  • Status: Expired due to Term
First Claim
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1. In an archery compound bow including a handle member, two resilient limbs carried by and projecting oppositely substantially symmetrically from the handle member, pulley means mounted on the tip portion of each of the limbs for turning about an axis relative to the handle member, a bowstring extending between the two pulley means and a take-up string engaged with each pulley means, the improvement comprising each pulley means including a generally planar noncircular bowstring cam pulley section engaged by the bowstring and a generally planar noncircular take-up string cam pulley section engaged by a take-up string, and integrating means directly combining said bowstring cam pulley section and said take-up string cam pulley section in parallel side-by-side relationship for forming a unit with substantially the entire peripheries of said two noncircular pulley sections out of registration, each of said bowstring cam pulley sections having bowstring lever arm means and each of said take-up string cam pulley sections having take-up string lever arm means for requiring a force to draw the bowstring which increases to a maximum during draw, the effective length of the bowstring lever arm means acting during such required increase in force to draw the bowstring always being less than 20 percent of the length of the maximum bowstring lever arm means.

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