Patent ID: 7938420
Filing Date: 2011-05-10
Classification: B62M

Abstract:
1. A drive mechanism for a bicycle having a front wheel, a rear wheel having a wheel sprocket, and a seat support, comprising: a) a frame on each of two sides of the bicycle including a lever arm bracket having a rear connection point, a drive sprocket support, and a drive gear support outside the drive sprocket support forming a space between the drive sprocket support and the drive gear support; b) a pedal leverage arm on each side of the bicycle, each pedal leverage arm connected to the rear connection point and having a pedal mounted on a forward end of the pedal leverage arm; c) a drive sprocket spindle on each side of the bicycle; d) a drive sprocket on each side of the bicycle; e) a drive gear on each side of the bicycle; f) a vertical gear on each side of the bicycle, attached to the pedal leverage arm on that side of the bicycle so that the vertical gear can mesh with the drive gear on that side of the bicycle; and g) a chain on each side of the bicycle extending around the drive sprocket and the wheel sprocket; wherein the drive sprocket spindle on each side of the bicycle extends from the drive gear support, through the drive gear, through the drive sprocket support to the drive sprocket on that side of the bicycle; and wherein downward movement of a pedal leverage arm causes the attached vertical gear to move downward, causing the meshed drive gear to turn, which causes the drive sprocket spindle on that side of the bicycle to turn, which causes the chain that goes around the drive sprocket on that side of the bicycle to turn, which causes the wheel sprocket and rear wheel to turn, due to permanent attachment of both the drive sprocket and drive gear to the drive sprocket spindle.