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Title:
A TWO-SEATER BICYCLE COMBINED WITH A SINGLE-SEATER BICYCLE
Document Type and Number:
WIPO Patent Application WO/2002/026554
Kind Code:
A1
Abstract:
A single-seater bicycle is attach-breakout assembled with the connecting body of the tail wheel of a two-seater bicycle, used by one or two persons. The bearing revolving barrel is fixed at the vertical hem of the connecting body of the tail wheel, and the revolution pipe installed on the bearer tube of the upper part of the rear wheel of the single-seater bicycle with bearing is connected to Coaxial Shaft joint. Thus, not only the connecting body of the tail wheel gets free up and down action and right and left rotation action, but the front and rear steering handle rotate in unison. The gear shaft of the single-seater bicycle and the suspension frames in both sides are erected and connected to install the suspension stands and rear rider's weight doesn't lean in the opposite sides, making the front rider's driving easier and the two-seater bicycle riding stabler and smoother.

Inventors:
PARK OK YOUNG (KR)
Application Number:
PCT/KR2001/000496
Publication Date:
April 04, 2002
Filing Date:
March 28, 2001
Export Citation:
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Assignee:
PARK OK YOUNG (KR)
International Classes:
B62K13/02; (IPC1-7): B62K13/02
Foreign References:
KR970049457U1997-08-12
KR880002350Y11988-07-02
KR890019165U1989-10-05
Attorney, Agent or Firm:
Kim, Ki Jong (Banpo-dong Seocho-gu Seoul 137-040, KR)
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Description:
Title A TWO-SEATER BICYCLE COMBINED WITH A SINGLE-SEATER BICYCLE Technical Field This invention concerns a two-seater bicycle which can be used as a single-seater bicycle when the tail wheel body of the two-seater bicycle is dissembled and detached and also used as a two-seater bicycle when the tail wheel body is connected and assembled. When it's a two-seater bicycle, the rear rider's steering handle automatically rotates in right or left, and his or her body moves in the same direction of the front rider as the front rider drives the steering handle in right or left and thus the front and rear wheel proceed in the same direction. Since the weight of the front and rear rider doesn't go in the opposite directions, the front rider needs less force to drive, the driving is safer, and the two-seater bicycle runs and accelerates more smoothly. The invention is a two-seater bicycle combined with a single-seater bicycle to satisfy those purposes and features described above.

BACKGROUNG ART A common old two-seater bicycle has three wheels in the same line, and the long connecting body and the connecting plate in the heart of the tail wheel are

installed in the upward direction. The connecting body installed to connect the front and rear wheel of the single-seater bicycle is connected to the connecting plate of the rotation pipe in the upper part of the suspension rod which is fixed in a separate position, in order to make the up and down and right or left rotation possible. Once it is detached from the connecting plate, the two-seater bicycle turns into a single-seater one. The tail wheel is detached by separating the connecting plate of the connecting-body from that of the rotation pipe. The two- seater bicycle combined with a single-seater bicycle working in the principle described above was invented by the inventor, and its public notification No. is 20-1998- 125202 (notified on August 17,1998).

The steering handle (the handle bar) of the bicycle invented earlier is attached to the connecting plate in the upper part of the connecting body and only works as a fixed bar the rider can grab for safety during riding. This is little help to the front rider's driving. Rather it hinders the normal driving as a two-seater bicycle since when the front rider drives in right or left, the rear rider's weight leans toward the exact opposite direction. It gives a challenge to the safe driving of the front rider and even causes an accident at high speed. In short, it has many problems when used as a two-seater bicycle

DISCLOSURE OF THE INVENTION The invention is improved to solve the problems of the old kind.

When used as a two-seater bicycle, the rear rider's steering handle automatically rotates in the same direction as the front rider's drives in right or left direction, and accordingly the rear rider's weight leans toward the same direction as the front rider, which is one of the prerequisites of safe and pleasant driving. Also when used as a two-seater bicycle, the tail wheel moves up and down smoothly by the bearing revolving barrel in the vertical hem of the connecting body and rotates in right or left smoothly by the revolution pipe, making a safe driving in roads high or low and curved roads.

As intended for a single-seater bicycle, it's very simple and easy to detach the rear steering wheel from the tail wheel and is improved for anyone to make an easy operation. The following is the detailed description of these features in the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The preferred embodiment of the present invention will now be described by way of example with reference to the accompanying drawings in which :

Fig 1. is the entire perspective view of the structure of the invention to be assembled as a two-seater bicycle.

Fig 2. is the perspective view of the connecting structure between the branch strut stand and the suspension frame.

Fig 3. is the side view of the cut of the steering handle installation part as in a two-seater bicycle.

Fig 4. is the enlarged sectional view of the steering handle installation part.

Fig 5. is the enlarged sectional view of Drawing 3 in A-A line direction.

Fig 6. is the enlarged longitudinal view of the fixing pipe of the steering handle.

Fig 7. is the side view as in a single-seater bicycle.

Fig 8. is the side view of the tail wheel body detached from the steering handle as in a single-seater bicycle.

Description of the marks of the important parts of the drawings.

BEST MODE FOR CARRYING OUT THE INVENTION In this invention, the single-seater bicycle (A) has its front and rear wheel (10) (10') connected to the bicycle body (15) between the lower strut pipe (12) of the front saddle (11) and the upper branch pipe (13) of the front wheel (10)'s frames in both sides. The upper strut pipe (12) of the front saddle (11) and the bicycle body are connected by the resolution stand (16).

The both sides between the gear shaft (17) in the center of the rear wheel (10'), the lower part of the bicycle body, and the strut pipe are connected by the connecting frames (18) (18'). And lastly, once the front steering handle (19) is installed at the upper part of the branch pipe (13), the single-seater bicycle (A) is complted.

The rear steering handle (19a) can be detached by connecting and fixing the bearer tube (2) above the both sides of the center gear shaft (17) of the rear wheel (10') with suspension stand (1) (l') and by connecting and fixing the strut pipe (12) to the suspension stands ( !) ( !') with two suspension frames (3) (3') in both sides.

The outside of the upper and lower bearer tube (2) has the screw part (4) and the bearing case (5), which is inserted in with revolution pipe (7) with top and bottom bearing (6) (6') inserted in it. The junction globe (8) is double connected and fixed to the screw part (4) at the

upper revolution pipe in screw method. Thus, the revolution pipe (7) rotates in right or left with ease outside the bearer tube (2) by the bearing (6) (6'). The junction pipe (21) to install the rear steering wheel (19a) in its upper side is inserted into the inside of the upper bearer tube (2). The lower junction pipe (21) is cut in obliquity (21').

The long screw rod (22) inserted into the center of the junction pipe (21) is connected to the wedge body (23) which has the opposite oblique section (23') to the obliquity (21') in screw method. When the handle (25) in the upper part of the screw rod (22) rotates, the oblique section (23') of the wedge body (23) and the obliquity (21') of the lower part of the junction pipe (21) contact each other.

Then the oblique section (23') is moving away a little from the obliquity (21'), and the wedge body (23) gets closely attached to the inner wall of the bearer tube (2), working as a wedge. Thus, the junction pipe (21) fixed at the lower part of the rear steering handle (19a) doesn't move being as a single object with the inner wall of the bearer tube (2).

The wedge body (23) is easily removed by the rotation in the opposite direction from the handle (25), and the rear steering handle (19a) is also pulled out and separated easily from the bearer tube (2).

As intended for a two-seater bicycle, its tail wheel (10a) has frames (30) (30') connected in each side between

the strut pipe (28) of the upper rear saddle (27) and the gear shaft (29) of the tail wheel (10a). The connecting body (15a) is installed at the upper part of the bearer tube of the saddle long. The tip of the connecting body (15a) which is strengthened and connected by the bearer stand (31) has the bearing revolving barrel (32) fixed. The bearing revolving barrel (32) is inserted in and connected to the Coaxial Shaft joint (33) (33') which is welded and fixed at the revolution pipe (7) above the rear bearer tube (2) of the single-seater bicycle (A), and thus easy to attach and detach with shaft screw (34) and the nut (35).

INDUSTRIAL APPLICABILITY The invention composed as in the description above works as follows : the bearing revolving barrel (32) fixed at the vertical hem of the connecting body (15a) of the two- seater bicycle (B) is inserted between the Coaxial Shaft joing (33) (33') which is fixed at the revolution pipe (7) of the rear bearer tube (2) of the single-seater bicycle, and then connected by the saft screw (34) and the nut (35), turning the invention into a two-seater bicycle as shown in Drawing 1. When it's intended for a single-seater bicycle, the bearing revolving barrel of the vertical hem of the connecting body (15a) of the two-seater bicycle (B) can be easily and conveniently detached from the Coaxial Shaft

joint (33) (33') of the revolution pipe (7), as shown in Drawing 7 and 8.

In the invention, the rear steering handle (19a) of the two-seater bicycle (B) is inserted and installed inside the bearer tube (2) above the suspension stands ( !) ( !') which stand in both sides on the screw shaft (17) of the rear wheel (10' of the single-seater bicycle, with the junction pipe (21). That is, the function pipe (21). Which holds the rear steering handle (19a) still is inserted inside the bearer tube (2) and thus rotates the handle (25) exposed to the outside. The wedge body (23) connected to the lower part of the long screw rod (22) is designed to make the contact and separation between the obliquity (21') of the junction pipe (21) and the oblique section (23') of the wedge body (23) possible. When they're attached, the wedge body (23) on the inner wall of the bearer tube (2) works as a wedge, holding the rear steering handle (19a) still. On the contrary, when separated, the attachment of the wedge body (23) is eased and removed, and thus the junction pipe (21) can be pulled out upward, and the rear steering handle (19a) can be detached, paving a convenient way to a single-seater bicycle.

As shown in Drawing 1 and 2, when the invention is combined and used as a two-seater bicycle (B), the junction pipe (21) of the rear steering handle (19a) is inserted in

the bearer tube (2) which is fixed at the suspension stands (1) (1) that are fixed and connected to the gear shaft (17) of the rear wheel (10') of the single-seater bicycle.

And thus it is closely attached and fixed to the wedge body (23) in the lower part of the long screw rod (22). As the result, when the front rider of the single-seater bicycle (A) and the rear rider of the two-seater bicycle (B) are driving together, the rear steering handle (19a) of the rear rider automatically rotates in the same direction as the front rider drives in right or left direction.

Accordingly, the weight of the front and rear rider leans toward the same direction as they move in the same direction, which leads to a safe dreving for both the front and the rear rider.

In other words, as the front rider operates the front steering handle (19) in right or left as he or she intends, the course direction of the rear rider follows the same direction of the front steering handle (19), automatically rotating in right or left. Since the rear rider's weight leans in the same direction with that of the front rider, the riding on the two-seater bicycle is smooth, safe, and pleasant.

Also the rear steering handle (19a) of the two-seater bicycle (B) is installed and exposed to the outside and rotates the handle (25) in right or left. And the wedge body

(23) in the lower part of the long screw rod (22) is closely attached to the inner wall of the bearer tube (2) and works as a wedge, whose attachment and detachment function enables the rear steering handle (19a) to attach and detach.

Accordingly, the operaytion of turning the inention into a single-seater bicycle or a two-seater bicycle is easy and simple. The function pipe (21) of the rear steering handle (19a) is inserted and installed in the bearer tube (2) whose connection with the suspension stand (1) (1') and the suspension frames (3) (3') is very solid. Accordingly, whether as a single-seater bicycle or a two-seater bicycle, the invention guarantees a stable and safe driving.