US Patent 10473417 Dual stage compound bow

The present disclosure provides for a cam assembly, the cam assembly comprising a main cam, a shoot cam coupled to the main cam, and a charge cam coupled to the main cam, wherein the main cam, the shoot cam, and the charge cam are configured to rotate in response to an external force, and the charge cam is configured to persistently store potential energy in the cam assembly upon rotation of the charge cam a predetermined distance.