Mar 3, 2026

US12566043 - Bow and cam assembly

A crossbow string guides that include upper and lower helical power cable journals on opposite sides of a draw string journal. A separation between first and second axis of the string guides in a drawn configuration is about 5 inches to about 10 inches and the draw string in the drawn configuration comprises an included angle of less than about 25 degrees. First and second pairs of power cables wrap and unwrap at least 300 degrees around, the respective first and second upper and lower helical power cable journals as the draw string moves between a released configuration to a drawn configuration.

Assignee: Ravin Crossbows, LLC
Inventors: Craig Yehle
Filing date: 2023-12-04

crossbowbowarchery

The patent describes a bow assembly featuring a riser and two limb assemblies, each with concave limbs that flex during drawing, and incorporates helical power cable journals for efficient string guidance. The design includes offset cam axes and specific fastener placements to enhance performance and stability in both drawn and released configurations.

Claim 1

1 . A bow comprising: a riser; a first limb assembly attached to the riser at a first side of the riser, the first limb assembly comprising a first pair of limbs having a concave shape directed toward a central portion of the bow; a first pivot attached to the riser that engages an inner surface of the first pair of limbs and provides a flexure point for the first pair of limbs when the bow is in a drawn configuration, the inner surface of the first pair of limbs facing inwards toward the riser; a first axle mount attached to the first limb assembly distal to the riser on an outer surface of the first pair of limbs, the outer surface of the first pair of limbs facing away from the riser; a first cam rotatably coupled to the first axle mount via a first axle disposed through a central portion of the first cam, wherein the first axle mount extends outward from the first limb assembly such that a first axis of rotation of the first cam is offset from an end of the first limb assembly distal to the riser; a first pair of fasteners that attach the first axle mount to the first limb assembly, the first pair of fasteners disposed through the first axle mount at a location between the first axle and the end of the first limb assembly distal to the riser; a second limb assembly attached to the riser at a second side of the riser opposite the first side, the second limb assembly comprising a second pair of limbs having a concave shape directed toward the central portion of the bow; a second pivot attached to the riser that engages an inner surface of the second pair of limbs and provides a flexure point for the second pair of limbs when the bow is in the drawn configuration, the inner surface of the second pair of limbs facing inwards toward the riser; a second axle mount attached to the second limb assembly distal to the riser on an outer surface of the second pair of limbs, the outer surface facing away from the riser; a second cam rotatably coupled to the second axle mount via a second axle disposed through a central portion of the second cam, wherein the second axle mount extends outward from the second limb assembly such that a second axis of rotation of the second cam is offset from an end of the second limb assembly distal to the riser; and a second pair of fasteners that attach the second axle mount to the second limb assembly, the second pair of fasteners disposed through the second axle mount at a location between the second axle and the end of the second limb assembly distal to the riser, wherein a greatest width between the first pair of limbs and the second pair of limbs, at least in the drawn configuration, occurs at a location on the first pair of limbs between the first axle mount and the first pivot and at a location on the second pair of limbs between the second axle mount and the second pivot. a riser; a first limb assembly attached to the riser at a first side of the riser, the first limb assembly comprising a first pair of limbs having a concave shape directed toward a central portion of the bow; a first pivot attached to the riser that engages an inner surface of the first pair of limbs and provides a flexure point for the first pair of limbs when the bow is in a drawn configuration, the inner surface of the first pair of limbs facing inwards toward the riser; a first axle mount attached to the first limb assembly distal to the riser on an outer surface of the first pair of limbs, the outer surface of the first pair of limbs facing away from the riser; a first cam rotatably coupled to the first axle mount via a first axle disposed through a central portion of the first cam, wherein the first axle mount extends outward from the first limb assembly such that a first axis of rotation of the first cam is offset from an end of the first limb assembly distal to the riser; a first pair of fasteners that attach the first axle mount to the first limb assembly, the first pair of fasteners disposed through the first axle mount at a location between the first axle and the end of the first limb assembly distal to the riser; a second limb assembly attached to the riser at a second side of the riser opposite the first side, the second limb assembly comprising a second pair of limbs having a concave shape directed toward the central portion of the bow; a second pivot attached to the riser that engages an inner surface of the second pair of limbs and provides a flexure point for the second pair of limbs when the bow is in the drawn configuration, the inner surface of the second pair of limbs facing inwards toward the riser; a second axle mount attached to the second limb assembly distal to the riser on an outer surface of the second pair of limbs, the outer surface facing away from the riser; a second cam rotatably coupled to the second axle mount via a second axle disposed through a central portion of the second cam, wherein the second axle mount extends outward from the second limb assembly such that a second axis of rotation of the second cam is offset from an end of the second limb assembly distal to the riser; and a second pair of fasteners that attach the second axle mount to the second limb assembly, the second pair of fasteners disposed through the second axle mount at a location between the second axle and the end of the second limb assembly distal to the riser, wherein a greatest width between the first pair of limbs and the second pair of limbs, at least in the drawn configuration, occurs at a location on the first pair of limbs between the first axle mount and the first pivot and at a location on the second pair of limbs between the second axle mount and the second pivot.

Google Patents

https://patents.google.com/patent/US12566043

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12566043