Patent ID: 6325400
Filing Date: 2001-12-04
Classification: B62K,B62M,Y10T

Abstract:
A treadle vehicle body forward drive structure comprised of a base plate, a transmission assembly and a treadle structure installed onto the said base plate, a gear assembly enmeshing the said transmission assembly to the said treadle structure, and a position limiting plate that maintains the position of the drive structure on the said base plate, of which:said base plate has respectively disposed on it a fixing mount and a bearing mount, wherein the center of the said fixing mount accommodates the insertion of the said treadle structure and installed in a bearing situated on the said bearing mount is the said transmission assembly; also projecting between the said two mounts is a fixing rod and a position limiting mount; situated on the said base plate at a coinciding position of a slant-cut fan gear of the said treadle structure is an arresting edge that positionally limits an ascending angle of a treadle rod and, furthermore, protruding from the ends of the said base plate are fastening mounts that provide for the insertion of screws into the through-holes of the said position limiting plate to achieve screw mounting,said transmission assembly consists of a follower shaft inserted over said base plate bearing mount and a straight-cut gear ensleeved over the said follower shaft; the ends of the said follower shaft projecting from the said position limiting plate are sleeved into wheel hub centers of the vehicle body rear wheels and capable of causing the said rear wheels to rotate,said treadle structure consists of said treadle rod sleeved onto the said base plate fixing mount, a torque spring with one end hooked onto a fastening mount of the said base plate and the other end hooked on the said treadle structure slant-cut fan gear, wherein the end of one extremity of the said treadle rod is situated against the said base mount arresting edge over the said slant-cut fan gear to positionally limit the ascending angle of the said treadle rod, with the other end of said treadle rod extending centrally from an elongated hole situated in a middle section of a vehicle body lower platform to thereby provide for treadling by a foot of the user; and, furthermore, when the said slant-cut fan gear is in a motionless state, its teeth enmesh with teeth of a slant-cut gear of the said gear assembly,said gear assembly is inserted on the said fixing rod of the said base plate and enmeshed with the said straight-cut gear the gear assembly of the said transmission assembly and the said slant-cut fan gear of the said treadle structure and, furthermore, a locating element is situated in between two gears of the gear assembly at their approximate axial centers and, furthermore, the said locating element is secured in a position limiting mount of the said base plate, but permits the said gear assembly to ascend and thereby give rise to buffered travel,said position limiting plate is sleeved onto the said follower shaft where it is installed in a bearing to facilitate the rotation of the said follower shaft; furthermore, fastening mounts of the said base plate are situated at the four end corners of the base plate, with each having a respective through-hole such that after the said screws are inserted, they are screwed into the said fastening mounts of the said base plate to attach and fix the said base plate to the said position limiting plate,when said treadle rod is tamped slightly downwards, the said slant-cut fan gear of the said treadle structure causes the said slant-cut gear and the said straight-cut gear of the said gear assembly to synchronously rotate, which in combination causes the revolution of the said follower shaft and the synchronous rotation of the said rear wheels; and, as such, provides the user riding pleasure and options, which is among the innovative features of the invention herein.