Patent ID: 8013457
Filing Date: 2011-09-06
Classification: A63B,H02K

Abstract:
1. An electric power generation system including: a first string and a second string configured to be pulled; a first portion of a bobbin configured to rotate in a direction when the first string is unwound from the bobbin as the first string is pulled; a second portion of a bobbin configured to rotate in the direction when the second string is unwound from the bobbin as the second string is pulled, wherein the pulling of the second string causes the first string to retract and the pulling of the first string causes the second string to retract; an electric power generator having a rotor wherein the rotor is mechanically coupled to the bobbin, wherein the mechanical coupling between the rotor and the bobbin are directly coupled without gears; a case, wherein the bobbin and the electric power generator are inside the case, and wherein the case is portable; and an output connector electrically connected to the electric power generator.