US12613074 - Archery bow with axial tensile springs and slope-based CAMS
The patent describes an innovative archery bow featuring a cam module with a variable slope cam track and a multi-roller shuttle system that enhances energy storage through axial tensile springs. This design allows for a compact and lightweight bow with customizable draw characteristics, improving performance and reducing lateral torque.
Claim 1
1 . An archery bow comprising: a riser configured to support a bowstring; a cam module rotatably mounted to a fixed pivot mounted to or supported by the riser, the cam module including: a cam track defined by an internal or external surface of the cam module and having a slope that varies along its length to produce a desired draw force curve; and at least one string groove on an outer periphery of the cam module configured to engage the bowstring; a multi-roller shuttle constrained to move along a predetermined path by a guide track surface mounted to or formed in the riser as the cam module rotates, the multi-roller shuttle comprising: at least one cam roller in rolling contact with the cam track; at least one guide roller in rolling contact with the guide track surface; and at least one spring attachment feature operatively connected to at least one axial tensile spring; wherein rotation of the cam module in a draw direction causes the cam track to exert force on the multi-roller shuttle via the cam roller, and the shuttle is constrained by the guide track surface to follow a predetermined path, thereby elongating the at least one axial tensile spring to store energy. a riser configured to support a bowstring; a cam module rotatably mounted to a fixed pivot mounted to or supported by the riser, the cam module including: a cam track defined by an internal or external surface of the cam module and having a slope that varies along its length to produce a desired draw force curve; and at least one string groove on an outer periphery of the cam module configured to engage the bowstring; a cam track defined by an internal or external surface of the cam module and having a slope that varies along its length to produce a desired draw force curve; and at least one string groove on an outer periphery of the cam module configured to engage the bowstring; a multi-roller shuttle constrained to move along a predetermined path by a guide track surface mounted to or formed in the riser as the cam module rotates, the multi-roller shuttle comprising: at least one cam roller in rolling contact with the cam track; at least one guide roller in rolling contact with the guide track surface; and at least one spring attachment feature operatively connected to at least one axial tensile spring; at least one cam roller in rolling contact with the cam track; at least one guide roller in rolling contact with the guide track surface; and at least one spring attachment feature operatively connected to at least one axial tensile spring; wherein rotation of the cam module in a draw direction causes the cam track to exert force on the multi-roller shuttle via the cam roller, and the shuttle is constrained by the guide track surface to follow a predetermined path, thereby elongating the at least one axial tensile spring to store energy.
Google Patents
https://patents.google.com/patent/US12613074
USPTO PDF
https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12613074