Mar 31, 2026

US12590777 - Lever system for lever bow

An archery bow is disclosed. Bows of the present disclosure comprise lever cams. The lever cam includes a base and an elongated lever arm that extends upwards or downwards, depending on which end of the bow the lever cam is attached to. The lever cams are rotatably secured between the split limbs of the bow. In some embodiments, the bows include an adjustment screw to change the position of an offset axle relative to a lever axle. In other embodiments, the bows include a pair of adjustable bowstring modules attachable to the respective elongated lever arms to alter the draw length of the bowstring.

Assignee: Bear Archery, Inc.
Inventors: Timothy Langley, David Hahn
Filing date: 2023-09-20

archerybowlevermechanism

The patent describes an archery bow featuring a lever cam system that allows for adjustable draw length and tension through the use of offset axles and adjustment screws. This innovative design enhances the bow’s performance by enabling precise modifications to the bowstring’s position and tension during use.

Claim 1

1 . An archery bow, comprising: a riser configured as a handle of the archery bow; an upper limb attached to an upper portion of the riser, wherein the upper limb comprises an upper left limb and an upper right limb; a lower limb attached to a lower portion of the riser, wherein the lower limb comprises a lower left limb and a lower right limb; an upper lever cam assembly including an upper lever cam with a base and an elongated lever arm extending upward from the base and a first lever axle, wherein the upper lever cam is rotatably attached between the upper left and upper right limbs via the first lever axle; a lower lever cam assembly including a lower lever cam with a base and an elongated lever arm extending downward form the base and a second lever axle, wherein the lower lever cam is rotatably attached between the lower left and lower right limbs via the second lever axle; a first power cable with a first end anchored to the base of the upper lever cam in a take-up position and a second end; a second power cable with a first end anchored to the base of the lower lever cam in a take-up position and a second end; and a bowstring with a first end extending up and over a rearward side of the elongated lever arm of the upper lever cam and anchored to the upper lever cam, and a second end extending down and under a rearward side of the elongated lever arm of the lower lever cam and anchored to the lower lever cam; wherein the upper lever cam assembly includes upper offset axle portions extending from the upper lever cam base parallel to the first lever axle, wherein the second end of the second power cable includes a pair of ends anchored to the upper offset axle portions; wherein the lower lever cam assembly includes lower offset axle portions extending from the lower lever cam base parallel to the second lever axle, wherein the second end of the first power cable includes a pair of ends anchored to the lower offset axle portions; wherein the upper offset axle portions are a single piece forming an upper offset axle extending through the upper lever cam, and wherein the lower offset axle portions are a single piece forming a lower offset axle extending through the lower lever cam; an upper adjustment screw engaged between the upper lever cam base and the upper offset axle, wherein the upper offset axle extends through a slot in the upper lever cam base, and wherein rotation of the upper adjustment screw alters the position of the upper offset axle through the upper lever cam relative to the upper lever axle; and a lower adjustment screw engaged between the lower lever cam base and the lower offset axle, wherein the lower offset axle extends through a slot in the lower lever cam base, and wherein rotation of the lower adjustment screw alters the position of the lower offset axle through the lower lever cam relative to the lower lever axle. a riser configured as a handle of the archery bow; an upper limb attached to an upper portion of the riser, wherein the upper limb comprises an upper left limb and an upper right limb; a lower limb attached to a lower portion of the riser, wherein the lower limb comprises a lower left limb and a lower right limb; an upper lever cam assembly including an upper lever cam with a base and an elongated lever arm extending upward from the base and a first lever axle, wherein the upper lever cam is rotatably attached between the upper left and upper right limbs via the first lever axle; a lower lever cam assembly including a lower lever cam with a base and an elongated lever arm extending downward form the base and a second lever axle, wherein the lower lever cam is rotatably attached between the lower left and lower right limbs via the second lever axle; a first power cable with a first end anchored to the base of the upper lever cam in a take-up position and a second end; a second power cable with a first end anchored to the base of the lower lever cam in a take-up position and a second end; and a bowstring with a first end extending up and over a rearward side of the elongated lever arm of the upper lever cam and anchored to the upper lever cam, and a second end extending down and under a rearward side of the elongated lever arm of the lower lever cam and anchored to the lower lever cam; wherein the upper lever cam assembly includes upper offset axle portions extending from the upper lever cam base parallel to the first lever axle, wherein the second end of the second power cable includes a pair of ends anchored to the upper offset axle portions; wherein the lower lever cam assembly includes lower offset axle portions extending from the lower lever cam base parallel to the second lever axle, wherein the second end of the first power cable includes a pair of ends anchored to the lower offset axle portions; wherein the upper offset axle portions are a single piece forming an upper offset axle extending through the upper lever cam, and wherein the lower offset axle portions are a single piece forming a lower offset axle extending through the lower lever cam; an upper adjustment screw engaged between the upper lever cam base and the upper offset axle, wherein the upper offset axle extends through a slot in the upper lever cam base, and wherein rotation of the upper adjustment screw alters the position of the upper offset axle through the upper lever cam relative to the upper lever axle; and a lower adjustment screw engaged between the lower lever cam base and the lower offset axle, wherein the lower offset axle extends through a slot in the lower lever cam base, and wherein rotation of the lower adjustment screw alters the position of the lower offset axle through the lower lever cam relative to the lower lever axle.

Google Patents

https://patents.google.com/patent/US12590777

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12590777