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Crossbow

DC
  • US 10,712,118 B2
  • Filed: 06/28/2018
  • Issued: 07/14/2020
  • Est. Priority Date: 12/16/2013
  • Status: Active Grant
First Claim
Patent Images

1. A crossbow comprising:

  • first and second flexible limbs attached to a center rail;

    a first string guide having a first axle engaged with a first bearing located in a first axle mount mounted to the first flexible limb and rotatable around a first axis located a first fixed distance from the first flexible limb by the first axle mount, the first string guide comprising a first draw string journal having a first plane of rotation perpendicular to the first axis, and first upper and lower helical power cable journals on opposite sides ofthe first draw stringjournal;

    a second string guide having a second axle engaged with a second bearing located in a second axle mount mounted to the second flexible limb and rotatable around a second axis located a second fixed distance from the second flexible limb by the second axle mount, the second string guide comprising a second draw string journal having a second plane of rotation perpendicular to the second axis, and second upper and lower helical power cable journals on opposite sides of the second draw string journal;

    a draw string received in the first and second draw string journals in a reverse draw configuration with the draw string adjacent a down-range side when in a released configuration, wherein the draw string unwinds from the first and second draw string journals as it translates from the released configuration to a drawn configuration;

    a pair of first power cables having first ends received in the first upper and lower helical power cable journals and second ends attached to static attachment points on the crossbow; and

    a pair of second power cables having first ends received in the second upper and lower helical power cable journals and second ends attached to static attachment points on the crossbow,wherein the first and second upper and lower helical power cable journals displace the pairs of power cables along the first and second axes relative to the first and second planes of rotation, respectively, and the first and second pairs of power cables wrap at least 270 degrees around the respective first and second upper and lower helical power cable journals as the draw string is moved between the released configuration to the drawn configuration, and the first and second pairs of power cables unwrap at least 270 degrees from the respective first and second upper and lower helical power cable journals as the draw string is moved between the drawn configuration to the released configuration, and the first and second axles move continuously toward the center rail as the draw string is moved from the released configuration to the drawn configuration and the first and second axles move continuously away from the center rail as the draw string is moved from the drawn configuration to the released configuration.

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