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US 12,571,607 B2Granted
Crossbow with pulley assembly
AssigneeRavin Crossbows, LLC
InventorCraig Yehle
Life of this patent
Estimating the term…
Abstract
A crossbow includes a flexible limb with a first end coupled to a frame and a second end. The crossbow includes a draw string that is configured to move between a released position and a drawn position. The crossbow includes a pulley assembly with a lever arm rotatably coupled to the flexible limb and configured to rotate about a lever arm axis. The pulley assembly includes a pulley rotatably coupled to the lever arm and configured to rotate about a pulley axis that is spaced apart from the lever arm axis by a fixed distance. The pulley includes a first and second draw string grooves. The draw string is received by the first and second draw string grooves. The lever arm and the pulley are each configured to rotate in a first direction as the draw string is moved from the released position to the drawn position.
Claims23
A crossbow, comprising:
- a first plate;
- a second plate coupled to the first plate and extending substantially parallel to the first plate, the second plate spaced apart from the first plate;
- a first upper flexible limb including a first end portion and a second end portion, the first end portion coupled to a first mounting location of the first plate;
- a first lower flexible limb including a first end portion and a second end portion, the first end portion coupled to a first mounting location of the second plate;
- a second upper flexible limb including a first end portion and a second end portion, the first end portion coupled to a second mounting location of the first plate;
- a second lower flexible limb including a first end portion and a second end portion, the first end portion coupled to a second mounting location of the second plate;
- a draw string, the draw string configured to move between a released position and a drawn position;
- a first pulley assembly, comprising:
- a first lever arm rotatably coupled to the second end portion of the first upper flexible limb and the second end portion of the first lower flexible limb, the first lever arm configured to rotate about a first lever arm axis;
- and
- a first pulley rotatably coupled to the first lever arm and configured to rotate about a first pulley axis, the first pulley including a first draw string groove, the draw string received by the first draw string groove, the first pulley axis spaced apart from the first lever arm axis;
- wherein the first lever arm is configured to rotate in a first direction about the first lever arm axis as the draw string is moved from the released position to the drawn position;
- wherein the first pulley is configured to rotate relative to the first lever arm in the first direction about the first pulley axis as the draw string is moved from the released position to the drawn position;
- and
- a second pulley assembly, comprising:
- a second lever arm rotatably coupled to the second end portion of the second upper flexible limb and the second end portion of the second lower flexible limb, the second lever arm configured to rotate about a second lever arm axis;
- and
- a second pulley rotatably coupled to the second lever arm and configured to rotate about a second pulley axis, the second pulley including a second draw string groove, the draw string received by the second draw string groove, the second pulley axis spaced apart from second lever arm axis;
- wherein the second lever arm is configured to rotate in a second direction about the second lever arm axis as the draw string is moved from the released position to the drawn position;
- wherein the second pulley is configured to rotate relative to the second lever arm in the second direction about the second pulley axis as the draw string is moved from the released position to the drawn position.
17 more elements
A crossbow, comprising:
- a frame;
- a flexible limb including a first end and a second end, the first end coupled to the frame;
- a draw string including a loop, the draw string configured to move between a released position and a drawn position;
- and
- a pulley assembly, comprising:
- a lever arm rotatably coupled to the flexible limb proximate the second end and configured to rotate about a lever arm axis;
- and
- a pulley rotatably coupled to the lever arm and configured to rotate about a pulley axis, the pulley including a first draw string groove and a second draw string groove, the loop received by the first draw string groove and the second draw string groove, the pulley axis spaced apart from the lever arm axis by a fixed distance;
- wherein the lever arm is configured to rotate in a first direction about the lever arm axis as the draw string is moved from the released position to the drawn position;
- wherein the pulley is configured to rotate relative to the lever arm in the first direction about the pulley axis as the draw string is moved from the released position to the drawn position.
7 more elements
A crossbow, comprising:
- a frame;
- a flexible limb including a first end and a second end, the first end coupled to the frame;
- a draw string configured to move between a released position and a drawn position;
- a power cable;
- and
- a pulley assembly, comprising:
- a lever arm rotatably coupled to the flexible limb proximate the second end and configured to rotate about a lever arm axis, the lever arm including a power cable groove, the power cable groove configured to receive at least a portion of the power cable;
- and
- a pulley rotatably coupled to the lever arm and configured to rotate about a pulley axis, the pulley including a draw string groove, the draw string received by the draw string groove, the pulley axis spaced apart from lever arm axis by a fixed distance;
- wherein the lever arm is configured to rotate relative to the flexible limb about the lever arm axis as the draw string is moved from the released position to the drawn position;
- wherein the pulley is configured to rotate relative to the lever arm about the pulley axis as the draw string is moved from the released position to the drawn position.
8 more elements
Dependencies are inferred from the claim text.