JP3168709U - Tandem bicycle improved structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tandem bicycle capable of being easily loaded in a trunk of an automobile such as a passenger car by forming a bicycle frame into three parts. A tandem bicycle has a frame 1, two saddles 2, front wheels 4, rear wheels 5, two handlebars 3, and a transmission mechanism 6. The frame has a front stage portion 11, a middle stage portion 12, and a rear stage portion 13 that are pivotally connected to each other. Locking devices 15 and 17 are provided between the front stage portion, the middle stage portion, and the rear stage portion, respectively. As a result, the tandem bicycle can be folded in three, the volume can be significantly reduced, and the tandem bicycle can be easily loaded in the trunk of a general automobile. Further, a front derailleur 82 having a front derailleur function is installed, and the front derailleur provides a multi-speed shift function by a chain tensioner 822 attached to the rear of the first main driving chain wheel (front sprocket) 61. [Selection diagram] Fig. 1

Description

  The present invention relates to an improved structure of a tandem bicycle, and more particularly to an improved structure of a tandem bicycle that can greatly reduce the volume and has a front shifting function.

  Along with the development of bicycles, various types of bicycles that are used for labor saving, leisure, entertainment and the like have been created. Among them, tandem bicycles (two-person bicycles) are improved as a means of transportation that two or more people can ride together, while conventional bicycles ride alone, besides being used for entertainment, Two or more persons can jointly transmit driving power to the bicycle to save labor.

  However, the currently known tandem bicycles are too inconvenient to carry by a car or the like because the body volume is too large. In addition, any conventional tandem bicycle capable of multi-speed shifting performs shifting by the rear shifting method, and when no one is riding on the rear portion, a person who rides in front cannot perform shifting directly. Further, since it is necessary to change the speed through the transmission of the rear sprocket, irregularities cannot be smoothly performed, which is inconvenient in use.

  The inventor pondered the possibility of improvement in the above-described drawbacks, and as a result of intensive research, has come up with the present invention that has a rational design and effectively improves the above-described drawbacks.

  The main object of the present invention is to provide an improved structure of a tandem bicycle that can be significantly reduced in volume and can be easily loaded on an automobile.

  Another object of the present invention is to provide an improved structure of a tandem bicycle that can be adjusted for multi-speed shifting and is easy to use even when no one is riding on the rear saddle. .

  In order to achieve the above-described object, a tandem bicycle according to the present invention has a front stage, a middle stage that is pivotally connected to the front stage, and a rear stage that is pivotally connected to the interruption part. A frame in which a first locking device is installed between the front stage part and the middle stage part, and a second locking device is installed between the middle stage part and the rear stage part; Two saddles, a front wheel attached to the front end of the front step of the frame, a first handle bar attached to the front end of the front step of the frame and connected to the front wheel, and a rear of the frame A rear wheel installed at an end; and a transmission mechanism installed on the frame and connected to the rear wheel.

  The present invention has the following beneficial effects. By improving the tandem bicycle according to the present invention so that it can be folded into three, the volume can be greatly reduced and it can be easily loaded on the trunk of a general automobile.

  The tandem bicycle according to the present invention further includes a front transmission having a function of front shifting, and provides a multi-stage shifting function by a chain tensioner attached to the rear of the first main chain wheel (front sprocket). The angle of the chain tensioner is adjustable, providing a function to adjust the chain tension in addition to the speed change function.

It is a side view of the first embodiment of the structure of the tandem bicycle of the present invention. It is an overhead view of the transmission mechanism of the first embodiment of the structure of the tandem bicycle of the present invention. It is a figure of the state by which the front stage part and middle stage part of the flame | frame of the 1st Example of the structure of the tandem bicycle of this invention were folded. It is a figure of the state by which the front part and middle part of the flame | frame of the 1st Example of the structure of the tandem bicycle of this invention were assembled. It is a figure of the state by which the handlebar of the 1st Example of the structure of the tandem bicycle of this invention is folded. It is a figure of the state by which the middle step and the rear step of the frame of the first embodiment of the structure of the tandem bicycle of the present invention were folded. It is a side view of the 2nd Example of the structure of the tandem bicycle of this invention. It is a bird's-eye view of the transmission mechanism of the 2nd Example of the structure of the tandem bicycle of this invention.

  Hereinafter, in order to further understand the features and technical contents of the present invention, it will be described in detail with reference to the drawings. The drawings are for reference and explanation, and do not limit the present invention.

<First Example>
FIGS. 1-6 is the 1st Example of the improved structure of the tandem bicycle concerning this invention. The improved structure of the tandem bicycle according to the first embodiment includes a frame 1, two saddles 2 provided to a person who rides forward and backward, a handlebar 3 which is controlled by a person who rides forward, and a frame 1. Each has a front wheel 4, a rear wheel 5, and a transmission mechanism 6 connected to each other.

  The frame 1 is a framework made of metal or other material, and connects and supports members such as a saddle 2, a handlebar 3, a front wheel 4, a rear wheel 5, and a transmission mechanism 6. The two saddles 2 are attached before and after the frame 1 in order to allow two people. The front wheel 4 and the rear wheel 5 are respectively installed at the front end and the rear end of the frame 1. The handle bar 3 is provided at the front end of the frame 1 and connected to the front wheel 4 so that a person who rides forward can control the traveling direction. Further, the frame 1 is provided with another handle bar 3 ′ for a person who gets on the rear side to grip it. The structure of the tandem bicycle described above is almost the same as that of the prior art, and a detailed description thereof will be omitted here.

  The present invention mainly adopts a design in which the frame 1 can be folded into three. That is, the frame 1 has a front step portion 11, a middle step portion 12, and a rear step portion 13. The handle bar 3 and the front wheel 4 are installed on the front step portion 11. The two saddles 2 and another bundle 3 ' The rear wheel 5 is installed on the rear stage 13. The transmission mechanism 6 is installed in the middle stage 12 and the rear stage 13.

  The rear end of the front step portion 11 and the front end of the middle step portion 12 are connected to each other by a first hinge 14. At this time, the rotational axis of the first hinge 14 is installed upright (perpendicular to the first transmission shaft 62) perpendicular to the frame 1, and the front stage portion 11 and the middle stage portion 12 are first Folding and assembling operations are performed using the hinge 14 as a pivot axis (see FIGS. 3 and 4). When the front stage 11 and the middle stage 12 are folded, the front stage 11 rotates to one side of the middle stage 12. Further, when assembling the front stage part 11 and the middle stage part 12, the front stage part 11 and the interrupting part 12 are fixed using the first locking device 15 installed between the front stage part 11 and the middle stage part 12. The first locking device 15 may be various quick release devices or screw locking devices, and the structure of the first locking device 15 is not limited.

  The rear end of the middle step portion 12 and the front end of the rear step portion 13 are connected to each other by a second hinge 16. At this time, the rotation axis of the second hinge 16 is installed horizontally (parallel to the second transmission shaft 69) perpendicular to the frame, and the middle stage portion 12 and the rear stage portion 13 turn the second hinge 16 around the rotation axis. Folding (see FIG. 6) and assembly operations are performed as a heart. When the middle stage portion 12 and the rear stage portion 13 are folded, the rear stage portion 13 rotates downward of the middle stage portion 12. Further, when the middle stage part 12 and the rear stage part 13 are assembled, the middle stage part 12 and the rear stage part 13 are fixed using the second locking device 17 installed between the middle stage part 12 and the rear stage part 13. The second locking device 17 may be various quick release devices or screw locking devices, and the structure of the second locking device 17 is not limited.

  Furthermore, the handle bar 3 of the present invention and the front stage 11 of the frame 1 can also be pivoted to each other, and the handle bar 3 and the frame 1 can also be folded (see FIG. 5).

  The transmission mechanism 6 is a pedal type transmission mechanism. The transmission mechanism 6 is installed on the frame 1 and connected to the rear wheel 5 to rotate the rear wheel 5 to advance the tandem bicycle. The transmission mechanism 6 includes a first main chain wheel (front sprocket) 61, a first transmission shaft 62, a first transmission chain wheel 63, a second transmission chain wheel 64, a third transmission chain wheel 65, a first chain 66, and a second chain. Main drive chain wheel (rear sprocket) 67, second chain 68, second transmission shaft 69, fourth transmission chain wheel 70, fifth transmission chain wheel 71, third chain 72, and sixth transmission chain wheel (free wheel) 73; And a fourth chain 74.

  The first main chain wheel (front sprocket) 61 includes a plurality of chain wheels of different sizes and constitutes a transmission wheel. The first main chain wheel 61 is pivotally connected to the middle step 12 of the frame 1 by a shaft 75 and is located below the front saddle 2. Both ends of the shaft 75 are connected to a crank 76 and a pedal 77, respectively, and the first main chain wheel 61 is rotated by driving the two pedals 77 to drive the transmission mechanism 6.

  The first transmission shaft 62 is pivotally connected to the middle step portion 12 of the frame 1 and is provided at a position that is an appropriate distance behind the first main driving chain wheel 61. The first transmission chain wheel 63, the second transmission chain wheel 64, and the third transmission chain wheel 65 are installed on the first transmission shaft 62. The first transmission chain wheel 63 and the third transmission chain wheel 65 are pivotally connected to the outer wall of the first transmission shaft 62 by one-way bearings (not shown), and the first transmission chain wheel 63 and the third transmission chain wheel 65 are Transmission in one direction only. The first transmission chain wheel 63 rotates in conjunction with the first transmission shaft 62 when rotating forward (clockwise direction), and idles (powers the first transmission shaft 62 when rotating backward (counterclockwise)). Do not tell). The third transmission chain wheel 65 rotates in conjunction with the first transmission shaft 62 when rotating forward (clockwise), and idles when rotating backward (counterclockwise). The second transmission chain wheel 64 is fixed to the outer wall of the first transmission shaft 62.

  The first chain 66 connects the first main driving chain wheel 61 and the first transmission chain wheel 63. As a result, when a person who rides forward pushes the two pedals 77 forward, the first transmission shaft 62 and the first transmission chain wheel 61, the first transmission chain wheel 63, and the first transmission chain wheel 63 are interposed. A second transmission chain wheel 64 fixed to one transmission shaft 62 is rotated forward.

  The second main driving chain wheel (rear sprocket) 67 is pivotally connected to the middle stage portion 12 of the frame 1 by a shaft 78. The second main driving chain wheel 67 is provided at a position below the rear saddle 2 and at an appropriate distance behind the first transmission shaft 62. Both ends of the shaft 78 are connected to a crank 79 and a pedal 80, respectively, and the second main chain wheel 67 is rotated by stroking the two pedals 80.

  The second chain 68 connects the second main driving chain wheel 67 and the third transmission chain wheel 65. As a result, when a person who rides backward pushes the two pedals 80 toward the front, the first transmission shaft 62 and the first transmission shaft 65 via the second main chain wheel 67, the second chain 68, and the third transmission chain wheel 65. A second transmission chain wheel 64 fixed to one transmission shaft 62 is rotated forward.

  The second transmission shaft 69 is pivotally connected to the middle stage portion 12 of the frame 1 and is positioned at an appropriate distance behind the first transmission shaft 62 (for example, behind the first transmission shaft 62 and in front of the shaft 78). Provided. The fourth transmission chain wheel 70 and the fifth transmission chain wheel 71 are fixed to the outer wall of the second transmission shaft 69. The third chain 72 connects the second transmission chain wheel 64 and the fourth transmission chain wheel 70 together.

  The sixth transmission chain wheel (free wheel) 73 is composed of a plurality of chain wheels of different sizes, constitutes a transmission wheel, and is connected to one side of the rear wheel 5. The fourth chain 74 connects the sixth transmission chain wheel 73 and the fifth transmission chain wheel 71. The second transmission shaft 69 is located between the third chain 72 and the fourth chain 74, forms a rotation point of the third chain 72 and the fourth chain 74, and the middle stage portion 12 and the rear stage portion 13 of the frame 1 are folded. When this is done, the third chain 72 and the fourth chain 74 can be fixed. Thereby, it can prevent coming off loosely (refer FIG. 6).

  The transmission mechanism 6 further includes a rear transmission 81 and a front transmission 82. The rear transmission 81 is connected to the fourth chain 74, and changes the combination of the fourth chain 74 and the chain wheel of different sizes of the sixth transmission chain wheel 73 to provide a rear transmission function. The front transmission 82 is connected to the first chain 66, and changes the combination of the first chain 66 and the chain wheels of different sizes of the first main chain wheel 61 to provide a function of front shifting.

  The front transmission 82 has a derailleur 821. The derailleur 821 is connected to the first chain 66 in the vicinity of the upper portion of the first main driving chain wheel 61 and moves the first chain 66 to achieve a front shift. The front transmission 82 further includes a chain tensioner 822. The chain tensioner 822 is located behind the first main driving chain wheel 61, and the first chain 66 is also connected to the chain tensioner 822. The chain tensioner 822 can elastically adjust the angle, and by appropriately pressing the first chain 66, the first chain 66 can maintain an appropriate tension even after a shift.

  When a person who rides forward pushes the two pedals 77 forward, the first transmission shaft 62 and the first transmission shaft via the first main chain wheel 61, the first chain 66, and the first transmission chain wheel 63. The second transmission chain wheel 64 fixed to 62 is simultaneously rotated forward, and the second transmission chain wheel 64 is connected to the second transmission shaft 69 and the first transmission chain via the third chain 72 and the fourth transmission chain wheel 70. The fifth transmission chain wheel 71 fixed to the two transmission shafts 69 is simultaneously rotated forward, and the fifth transmission chain wheel 71 is further connected to the rear wheel 5 via the fourth chain 74 and the sixth transmission chain wheel 73. Rotate.

  When a person who rides backward pushes the two pedals 80 toward the front, the first transmission shaft 62 and the first transmission shaft are connected via the second main chain wheel 67, the second chain 68, and the third transmission chain wheel 65. The second transmission chain wheel 64 fixed to 62 is simultaneously rotated forward, and the second transmission chain wheel 64 is connected to the second transmission shaft 69 and the first transmission chain via the third chain 72 and the fourth transmission chain wheel 70. The fifth transmission chain wheel 71 fixed to the two transmission shafts 69 is simultaneously rotated forward, and the fifth transmission chain wheel 71 is rear wheeled via the fourth chain 74 and the sixth transmission chain wheel 73. 5 is rotated.

  In the present invention, a first transmission shaft 62, a first transmission chain wheel 63, a second transmission chain wheel 64, a third transmission chain wheel 65, and the like constitute a first transmission hub, and further, a second transmission shaft 69 and a fourth transmission shaft. A second transmission hub is constituted by the transmission chain wheel 70 and the fifth transmission chain wheel 71 and the like, and a transmission hub that connects persons who ride forward and backward is formed. However, the arrangement and quantity of the transmission hubs are not limited and may be appropriately changed.

  The tandem bicycle of the present invention rotates the rear wheel 5 by specially designing a transmission mechanism 6 that can cooperate, and the rear wheel 5 rotates together by the person who rides forward and backward simultaneously pedals. Can be made. In addition, even if the person who rides backward does not pedal the pedal, the person who rides forward does not affect the pedaling. Even if the person who rides forward does not pedal the pedal, it rides backward. Only a person can move forward with a pedal.

  That is, a person who rides forward and backward does not need to pedal at the same time, and when one person is pedaling, if another person pedals the pedal in the opposite direction, it will idle and affect the forward speed. Or the chain will not come off. That is, since the power of the person who rides before and after does not influence each other, it can be easily run.

<Second Example>
Referring to FIGS. 7 and 8, the transmission mechanism 6 in the second embodiment of the present invention includes a first main chain wheel (front sprocket) 61, a first transmission shaft 62, a first transmission chain wheel 63, and a third transmission. It has a chain wheel 65, a first chain 66, a second main driving chain wheel (rear sprocket) 67, a second chain 68, a sixth transmission chain wheel (free wheel) 73, and a fourth chain 74. In this embodiment, the second transmission chain wheel 64, the second transmission shaft 69, the fourth transmission chain wheel 70, the fifth transmission chain wheel 71 and the third chain 72 in the first embodiment are omitted, and the structure is simplified. It has become. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.

  The first main chain wheel 61 is composed of a plurality of chain wheels of different sizes, and the first transmission chain wheel (first transmission chain wheel) 63 and the third transmission chain wheel (second transmission chain wheel) 65 are: It is provided on the first transmission shaft 62. The second main chain wheel 67 is composed of two chain wheels. The sixth transmission chain wheel (third transmission chain wheel) 73 is composed of a plurality of chain wheels of different sizes and is connected to the rear wheel 5.

  The first chain 66 is connected to the first main driving chain wheel 61 and the first transmission chain wheel 63. The second chain 68 is connected to one chain wheel of the second main driving chain wheel 67 and the third transmission chain wheel 65. The fourth chain (also referred to as a third chain) 74 is connected to the other chain wheel of the sixth transmission chain wheel 73 and the second main driving chain wheel 67. The second main driving chain wheel 67 in the present embodiment is located between the second chain 68 and the fourth chain 74 and can form a rotation point of the second chain 68 and the fourth chain 74. When the part 12 and the rear stage part 13 are folded, the second chain 68 and the fourth chain 71 can be fixed. This prevents it from loosening and coming off.

  The improved structure of the tandem bicycle of the present invention has at least the following beneficial effects.

  1. The tandem bicycle according to the present invention has been improved so that it can be folded in three, and the frame is divided into a front stage, a middle stage, and a rear stage. By folding, the volume can be greatly reduced. Tandem bicycles can be easily loaded on the trunk. The present invention can be designed to fold the frame into a plurality of folds such as four or five.

  2. The present invention breaks the concept of general synchronous tandem bicycles and asynchronous tandem bicycles and has a front shifting function. The front transmission provides a multi-speed transmission function by a chain tensioner attached to the rear of the first main chain wheel (front sprocket). The angle of the chain tensioner can be adjusted, and in addition to providing a speed change function, the tension of the first chain can be adjusted.

  3. The present invention can be folded by a double chain wheel shaft, and the chain can be folded effectively without loosening and coming off. The double chain wheel shaft can be installed in any position, such as sprockets, joints, etc., and can be installed in the most suitable place according to the type of bicycle.

  The above detailed description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Accordingly, any changes, replacements, etc. added to the contents disclosed in the specification and drawings of the present invention are included in the present invention.

1 frame 11 front stage 12 middle stage 13 rear stage 14 first hinge 15 first lock device 16 second hinge 17 second lock device 2 saddle 3 handle bar 3 'handle bar 4 front wheel 5 rear wheel 6 transmission mechanism 61 first main drive Chain wheel 62 First transmission shaft 63 First transmission chain wheel 64 Second transmission chain wheel 65 Third transmission chain wheel 66 First chain 67 Second main driving chain wheel 68 Second chain 69 Second transmission shaft 70 Fourth transmission chain wheel 71 fifth transmission chain wheel 72 third chain 73 sixth transmission chain wheel 74 fourth chain 75 shaft 76 crank 77 pedal 78 shaft 79 crank 80 pedal 81 rear transmission 82 front transmission 821 derailleur 822 chain tensioner

Claims (11)

A first stage locking device having a front stage part, a middle stage part pivotally connected to the front stage part, and a rear stage part pivotally linked to the interrupting part; and between the front stage part and the middle stage part; And a frame in which a second locking device is installed between the middle stage part and the rear stage part,
Two saddles attached respectively to the front and rear positions of the frame;
A front wheel installed at a front end of the front stage of the frame;
A first handlebar provided at the front end of the front stage of the frame and connected to the front wheel;
A rear wheel installed at the rear end of the frame;
A transmission mechanism installed on the frame and connected to the rear wheel;
Tandem bicycle with. The transmission mechanism includes a first main chain wheel, a first transmission shaft, a first transmission chain wheel, a second transmission chain wheel, a third transmission chain wheel, a first chain, and a second main driving chain wheel. A second chain, a second transmission shaft, a fourth transmission chain wheel, a fifth transmission chain wheel, a third chain, a sixth transmission chain wheel, and a fourth chain;
The first main chain wheel includes a plurality of chain wheels of different sizes,
The second transmission chain wheel is provided between the first transmission chain wheel and the third transmission chain wheel,
The first transmission chain wheel, the second transmission chain wheel, and the third transmission chain wheel are provided on the first transmission shaft,
The first chain connects the first main chain wheel and the first transmission chain wheel,
The second chain connects the second main chain wheel and the third power chain wheel,
The second transmission shaft is pivotally connected to the middle portion of the frame behind the first transmission shaft,
The fourth transmission chain wheel and the fifth transmission chain wheel are provided on the second transmission shaft,
The third chain connects the second transmission chain wheel and the fourth transmission chain wheel,
The sixth transmission chain wheel includes a plurality of chain wheels of different sizes, and is connected to the rear wheel,
The tandem bicycle according to claim 1, wherein the fourth chain connects the sixth transmission chain wheel and the fifth transmission chain wheel. The first main chain wheel is pivotally connected to the middle portion of the frame by a shaft having a crank and a pedal connected to both ends.
3. The tandem bicycle according to claim 2, wherein the first transmission shaft is pivotally connected to the middle step portion of the frame and is located behind the first main driving chain wheel.   4. The tandem bicycle according to claim 2, wherein the first transmission chain wheel and the third transmission chain wheel are pivotally connected to the first transmission shaft by a one-way bearing.   3. The second main chain wheel is pivotally connected to the middle stage portion of the frame by another shaft having a crank and a pedal connected to both ends, and is located behind the first transmission shaft. The tandem bicycle according to any one of items 4 to 4. The transmission mechanism has a rear transmission and a front transmission,
The rear transmission is connected to the fourth chain;
The front transmission includes a chain tensioner and is connected to the first chain;
6. The chain tensioner according to claim 2, wherein the chain tensioner is located behind the first main driving chain wheel and is connected to the first transmission chain wheel by the first chain. 7. Tandem bicycle. Further comprising a second handlebar installed in the middle section;
The two saddles are installed in the middle stage,
The rear wheel is installed at the rear stage,
The tandem bicycle according to any one of claims 1 to 6, wherein the transmission mechanism is installed in the middle stage part and the rear stage part.   The front stage part and the middle stage part are pivotally connected to each other by a first hinge, and the pivot axis of the first hinge is installed upright perpendicular to the frame. The tandem bicycle according to any one of 1 to 7.   The middle stage part and the rear stage part are pivotally connected to each other by a second hinge, and a rotation axis of the second hinge is horizontally installed perpendicular to the frame. The tandem bicycle according to any one of 1 to 8.   The tandem bicycle according to any one of claims 1 to 9, wherein the first lock device and the second lock device are a quick release device or a screw lock device. The transmission mechanism includes a first main chain wheel, a first transmission shaft, a first transmission chain wheel, a second transmission chain wheel, a first chain, a second main driving chain wheel, and a second chain. , Having a third transmission chain wheel and a third chain,
The first main chain wheel includes a plurality of chain wheels of different sizes,
The first transmission chain wheel and the second transmission chain wheel are provided on the first transmission shaft,
The first chain connects the first main chain wheel and the first transmission chain wheel;
The second main chain wheel is provided behind the first transmission shaft,
The second chain connects the second main chain wheel and the second power chain wheel,
The third transmission chainwheel includes a plurality of chainwheels of different sizes and is connected to the rear wheel;
The tandem bicycle according to claim 1, wherein the third chain connects the third transmission chain wheel and the second main chain wheel.

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