Single cam compound bow

  • US 5,505,185 A
  • Filed: 01/13/1995
  • Issued: 04/09/1996
  • Est. Priority Date: 01/13/1995
  • Status: Expired due to Term
First Claim
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1. An archery bow comprising:

  • a handle portion;

    a first flexible limb supported by said handle portion;

    a second flexible limb supported by said handle portion;

    a top pulley assembly pivotably mounted upon said first limb for rotation about a first axle, said top pulley assembly including a first groove defining a first curve and a second groove defining a second curve, at least one of said first and second curves having a varying radius relative to said first axle;

    a bottom pulley assembly pivotably mounted upon said second limb for rotation about a second axle, said bottom pulley assembly including a power cam portion having a third groove defining a third curve having a varying radius relative to said second axle and a bottom pulley element having a fourth groove separate from said third groove, said fourth groove defining a fourth curve having a varying radius relative to said second axle;

    a first cable having a first end thereof affixed to said top pulley assembly and having a portion of the length thereof, proximate said first end, received in said first groove, said first cable having a second end thereof affixed to said bottom pulley assembly and having a portion of the length thereof, proximate said second end, received in said bottom pulley element, said first cable further including a nock point defined thereupon at a point intermediate said first and second ends;

    a second cable having a first end thereof affixed to said first limb and a second end thereof affixed to said bottom pulley assembly and having a portion of the length thereof proximate said second end received in said third groove;

    a third cable having a first end thereof affixed to said top pulley assembly and having a portion of the length thereof, proximate said first end, received in said second groove, said third cable having a second end thereof affixed to said bottom pulley assembly and having a portion of the length thereof proximate said second end received in said bottom pulley element;

    wherein said first and second grooves are configured so that as said top pulley assembly rotates about said first axle, said first cable is unwound from said first groove at a rate which differs from a rate at which said third cable is wound into said second groove, and wherein said third groove and said bottom pulley element are configured so that as said bottom pulley assembly rotates about said second axle, said first and third cables are unwound from said bottom pulley element as said second cable is wound into said third groove; and

    wherein said nock point moves in a straight line as said top and bottom pulley assemblies rotate in opposite directions.

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