1. Twin-Frame Bicycle Chin, Hsu-Sheng Fan Chiang, Tsung-Lin Chin, Chih-Ching E-mail: chunchin@ms4.hinet.net Movie 2 Button Movie 2 Button Movie 1 Button Movie 1 Button

2.  Bicycle is a very popular transportation tool and sports equipment. However, to the physically handicapped persons, including the hearing or visually impaired, they can just envy the normal people for their carefree rides on bicycles, and cannot enjoy riding it at all. And the safety of bicycle ride by children or old people also makes people feel worry about it. 「 Twin-Frame Bicycle 」 is a bicycle available for two people to ride together side by side. The bicycle body is composed of a primary bicycle and an auxiliary wheel, which are connected by a flexible quadrangular articulation mechanism.

3.  When a regular bicycle turns, by inclination of the driver’s body and the bicycle body, the reversed moment can be created to reduce the centrifugal moment which may cause the bicycle to overturn outwards. As to 「 Twin-Frame Bicycle 」, it has the same motion form of a regular bicycle, and enables the parallel movement of two human bodies, primary bicycle and auxiliary wheel. Therefore, when it turns or moves on rough and uneven surface, it can still keep moving stably and at a limited inclination angle, but will not overturn. In addition to its strong structure, the bicycle body can be dismantled and assembled rapidly.

4. Before Now Bicycle permitting operation by two people.

5. Structure of Auxiliary Wheel

6. Gear Unit of Auxiliary Wheel

7.  The auxiliary wheel body comprises two auxiliary sprocket wheels, a gear assembly and an auxiliary rear folk, the gear assembly comprises two active gears and two passive gears, the auxiliary sprocket wheels are connected pivotally to both sides of the shaft of the auxiliary wheel, the active gears are connected pivotally to the auxiliary rear folk on both sides of the auxiliary wheel, the pedal mechanism of the auxiliary wheel body drives the active gears to drive the auxiliary sprocket wheels through the passive gears, and the auxiliary wheel is driven to rotate.

8. Joint Configurations

9. Articulated Machine

10. Parts of Articulated Machine

11. Connector of Primary Bicycle

12.  「 Twin-Frame Bicycle 」 has a set of coupling bars. Four rows of perpendicularly-arranged springs lined between the bars. Therefore, the bicycle can lean with the primary bicycle and auxiliary wheel paralleled within a limited range to prevent overturn. Springs are interlaced between ends of joint configuration, which can resist deformation and therefore maintain the stability of both primary bicycle and auxiliary wheel bodies.

13. A Finished Product (Front View)

14. A Finished Product (Rear View)

15.  The invented special bicycle for multiple persons to ride at the same time can be divided into two types. One of them is the tandem bicycle with seats in front-and-rear structure. The other type has seats in parallel structure. However, it cannot perform inclination action, implying that it cannot make speedy turns. When it runs on rough and uneven surface, it may even overturn. 「 Twin- Frame Bicycle 」 has the merits of both types, which refer to the dexterity in the control of seats in front-and-rear structure as well as the friendship building and entertaining effects of seats in parallel structure, but has no defect of the two types.

16. A Finished Product (Type 2) Primary Bicycle and Two Types of Auxiliary Wheels

17. Twin-Frame Bicycle (Type 2)

18. Spokes Protecting Plate Gear Wheel Crank Axle Ball Bearing Shaft Configuration (Type 2)

19. Twin-Frame Bicycle (Type 3)

20. A Finished Product (Type 3)

21. Shaft Configuration (Type 3)

22.  The auxiliary wheel body comprises two fixing bases, an active gear, a passive gear and an idler box, the auxiliary wheel further comprises a rung, the fixing bases are connected to both sides of the shaft of the auxiliary wheel, the active gear is a fixed gear, the passive gear is a movable gear, a small idler of the idler assembly engages with the active gear, a big idler of the idler assembly engages with the passive gear, the big idler drives the passive gear, and the passive gear drives the rung to rotate the auxiliary wheel.

23. When this bicycle is turning, for instance, turning right, it shall be like that shown in the left exhibition. The principal and auxiliary bicycle bodies encounter height discrepancy or are operated on uneven ground.

24. Advantages ․ High driving safety ․ Quickly to install ․ Can be mounted on nearly all bikes ․ Beside you instead of behind you Thank You! Thank You! Movie 1 Button Movie 1 Button Movie 2 Button Movie 2 Button