Land vehicles – Wheeled – Occupant propelled type
Reexamination Certificate
1999-06-04
2001-03-06
Johnson, Brian L. (Department: 3618)
Land vehicles
Wheeled
Occupant propelled type
C280S278000, C280S639000
Reexamination Certificate
active
06196566
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a lightweight folding bicycle, particularly to the improvment on the structure of normal folding bicycle.
A shockproof foldable bicycle is disclosed in China Patent No.902074636. Its folding structure is with two seat tubes in front and back, their buttom ends hinge joint with the tail end of a crossbar respectively and the bottom end of the back crossbar joints a back fork simultaneously. The other end of the back fork joints a flat fork and the other end of the flat fork joints a standing tube and a down tube at the same point. The other end of the standing tube joints in the middle of the front seat tube and the other end of the down tube joints in the middle of the crossbar. The siting of the bike while unfolded is realized by a bidirectional-interlocking-device mounted in the tail end of the crossbar. A wedge clip on the knob of the bidirectional-interlocking-device embed on the sunken of the front seat tube bottom end to prevent the front seat tube rotating around an axle, so as to site the frame. Because the sunken in the bottom end of the front seat is near the axle while a saddle fixed on the top of the front seat tube is far from the axle and the seat tube leans back, the saddle endures weakly. Besides, the surface of the wedge clip is easy to be worn and then produce gap, it will bring some hidden danger to rider. A pedal has no folding device. A folding device of a handlebar stem is fixed by screws. This type of folding bicycle has a complicated structure and cannot be handled easily. It is also high cost, heavy weight, less loaded and the saftey of use cannot be insured.
SUMMARY OF THE INVENTION
Therefore the main object of the invention is to provide a lightweight folding bicycle which frame can be folded quickly.
Another object of the invention is to provide a lightweight folding bicycle which handlebar stem can be folded quickly.
A further object of the present invention is to provide a lightweight folding bicycle which pedal can be folded quickly.
This invention provide a lightweight folding bicycle, in which a frame connects front and back wheels through a driving system and a braking system, a handlebar is fixed on the front of a crossbar by a handlebar stem and the driving system links with a pedal through a crank. A saddle is fitted on the top end of a seat tube and the bottom end of the seat tube hinge joints with the tail end of the crossbar while this tail end joints the left and right hinge points of a back fork. The other end of the back fork joints a cross fork and the other end of the cross fork joints two standing tubes (left and right) at the same point as one end of a down tube hinged. The other end of the two standing tube joints in the middle of the seat tube and the other end of the down tube hinges in the middle of the crossbar. A diagonal-bar-hinge is added and made up of two parts, which hinges each other. One end of the diagonal-bar-hinge joints in the middle of the seat tube at the same point as the standing tube hinged and the other end of the diagonal-bar-hinge joints in the middle of the crossbar at the same point as the down tube hinged. The diagonal-bar-hinge has a spacing structure.
A four-bar-linkage-speed-folding-fasterner is installed between the bottom end of the handlebar stem and a fork column at the head of the crossbar. An upper hinge and a lower hinge of the fastener are respectively joint fixely with the two ends of the handlebar stem, these two hinges joint movably through a long pin axle. There is a notch in one side of the lower hinge where an adjustable nut joints movebaly. A concave buckle joints the lower hinge through a pin at one end and joints a slot through a pin at the other end. The cross section shape of the concave buckle is arc. The width of the slot is bigger than the height of the notch. The other end of the slot joints a supporting pole movably. One end of an adjustable screw joints the hole inside the supporting pole movably and the other end of the adjustable screw connects with the adjustable nut through a screw thread.
The pedal is collapsible. A rack hinge joints with a fixing spindle through a pin. There is a boss in the middle of a fixing pole and in one side of the boss there is a hole with screw thread. A compression spring covers the outer of the fixing pole and presses on the boss. The outside diameter of the boss is bigger than the diameter of the compression spring. The fit between the boss and the inside diameter of the fixing spindle is a sliding fit. One end of the fixing pole inserts into the inner hole of the rack and the other end of it is threaded connection with the pedal. The rack connects with the crank of the driving system through a threaded connection.
REFERENCES:
patent: 3637257 (1972-01-01), Uncapher
patent: 4422663 (1983-12-01), Hon
patent: 4440414 (1984-04-01), Wang
patent: 4460192 (1984-07-01), Takamiya et al.
patent: 5052706 (1991-10-01), Tsi et al.
patent: 5337609 (1994-08-01), Hsu
patent: 5440948 (1995-08-01), Vheng
patent: 5492350 (1996-02-01), Pan
patent: 5906452 (1999-05-01), Lee
patent: 6032971 (2000-03-01), Herder
patent: 90207463 (1991-05-01), None
patent: 197 38 770 (1999-03-01), None
Akin Gump Strauss Hauer & Feld L.L.P.
Johnson Brian L.
Yeagley Daniel
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