JP2010254265A - Folding bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bicycle allowing of the safely riding of two infants by resolving such inconvenience that a heavy item such as the infant shifts a load by a handle bar and causes a trouble in operation when fixing a seat for one person to a part of a rear carrier and other seat to the handle bar, respectively. <P>SOLUTION: A bench seat 22 for two infants is fixed to a vehicle body so as to stride a front wheel for driving, the heavy item such as the infant is prevented from load-shifted together with the handle bar 1, and the two infants come into a view during travel, thus securing ease. Stability is improved by expanding right and left rear wheels for steering in accordance with the width of the bench seat, and overturning is prevented by suppressing an inclination in a small amount using a link mechanism capable of setting a maximum slope angle while synchronizing the right and left rear wheels with the inclination of the vehicle body so as not to impair the lightness of the drive of the bicycle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bicycle that can be used as a baby buggy when folding a three-seater bicycle carrying two infants and a folding bicycle that can be carried like a carry bag when folded.

  A general folding bicycle is to be folded and placed, but it is not clear what to do after it is folded, except when it is at home or when it is carried by car.

  The problem to be solved is that there is a problem in securing a bicycle parking lot when using a bicycle for commuting, attending school or shopping.

  Don't leave your bike, fold it up, or fold it up.

  When you go shopping on a bicycle with two infants, you should park your bicycle in front of the station or in the shopping mall bicycle parking area, rather than holding the infant and pulling the infant's hand to carry the bicycle. When folded, it becomes a baby buggy, and you can pull the baby buggy and shop.

  When you use it for commuting or going to school, you need to bring it to the train when you fold it, so it is not only lightweight and compact, but the shape when folded is important. There is a carry bag, but if you fold a bicycle, it will be like a carry bag and you can easily bring it into the train.

These two types of bicycles are used for different purposes but have almost the same structure. They are three-wheeled bicycles that have small-diameter tires on the front wheels and small tires on the left and right. The front wheels are driven and the rear wheels are steered.
The rear two wheels are in the same bank as the car body when driving, and if the steering wheel is cut in the direction you want to turn, the rear wheel cuts in the direction opposite to the direction of the steering wheel, and the car body turns in the direction of the steering wheel.
The body consists of a tube connecting the handle and the rear wheel, and a tube connecting the seat and the front wheel. When folded like a baby buggy or carry bag, it folds around a single fulcrum.

  The structure of the vehicle body is as follows. The bracket 1 is welded to the outside of the tube near the center of the down tube 5 and the bent tube 4 connecting the head 2, the head tube 3, the head tube 3 and the down tube 5 from the handle 1 in FIG. 45c, the bracket 7 is welded to the outside of the tube lower end of the down tube 5, the sprocket 45a, the crank 8 and the pedal 9 are attached to the inside of the bracket 7, and the down tube pillar 10 and the down tube pillar 10 inserted into the tube of the down tube 5 2 which is divided into four parts at the lower end of the control tube 11, the pivots a · b · c · d provided on the crown 12, and the pivot provided on the left upright 14 ef, pivot g · h, pivot on right upright Left upper arm 16 connecting toe and e, left lower arm 17 connecting pivots b and f, right upper arm 18 connecting pivots c and g, right lower arm 19 connecting pivots d and h, bank angle connecting pivots e and g Left and right rear wheels are attached to the adjusting rod 20 and the left and right uprights 14 and 15.

  The other half of the vehicle body includes left and right chain stays 21 to which the front wheels of FIG. 1 are attached, infant bench seats 22 to be attached to the left and right chain stays 21, and brackets for attaching infant bench seats 22 to the left and right chain stays 21 at six points. 23, a sprocket 45e near the bracket 23 of the left chain stay, a sprocket 45f coaxial with the sprocket 45e inside the left and right chain stays 21, a chain wheel 24 between the sprocket b and the sprocket e inside the left and right chain stays 21, A sprocket 45d is coaxially provided, a sprocket g coaxial with the front wheel is provided outside the left chain stay, a seat tube 25 is welded to the upper ends of the left and right chain stays 21, a seat pillar 26 is inserted into the seat tube, and a saddle 27 is provided above the seat pillar 26. Take Kick.

  The portion connecting the vehicle body that supports the rear wheel and the vehicle body that supports the front wheel connects the central axis of the sprockets 45b and 45c and the bracket 6 with a shaft and serves as a pivot for folding, so that the two vehicle bodies are fixed. The bracket 28 is welded to the down tube 5, the bracket 29 is welded to the down tube 5 side, the lock mechanism 30 is attached, and the seat pillar 26 and the down tube pillar 10 slide, so the upper end of the seat tube 25 and the lower end of the down tube 10 are Clamps 46a and 46b are provided respectively.

A normal headset portion is provided in the curved tube 4 of FIG. 3, the upper bearing 31 and the lower bearing 32 are fixed to the tube, the upper portion of the control tube 11 connecting the stem 2 and the upper bearing 31 is connected, and the crown 12 and the lower portion are connected. The lower part of the control tube 11 that connects the bearings 32 is connected.
However, since the curved tube 4 is literally curved, it does not hold unless the control tube 11 is made flexible, but the control tube 11 is bisected at the midpoint of the curved tube 4.
There is also a method of connecting the bisected control tube 11 with a universal joint. Considering the turning angle and assembling of the rear wheel when the handle is turned off, the inner bevel gear 33 is set on one side and the bevel gear 34 is set on the other side. The gear ratio and the caster angle of the down tube 5 are compensated for the excessive effectiveness of the small turn.

There is a control tube 11 in the down tube pillar 10, but since the down tube pillar 10 slides when folded, the control tube 11 also needs to slide. Does not work. For this reason, the tube of the control pipe 11 of FIG. 4 is made into the double structure 33, and also it is set as the two or more multiple tubes 34, and the stopper mechanism 35 is provided so that the tube of the double structure 33 may not come off.
Since the lowermost part of the down tube pillar 10 and the control pipe 11 is detached only by being inserted, it is fixed by a screw-type lower bearing 36 of the headset.

The rear wheel bank mechanism is established by the positional relationship of the pivots 44a, 44b, 44c and 44d provided on the crown 12 in FIG. 2 and the pivots 44e, 44f, 44g and 44h provided on the left and right uprights 14 and 15, respectively. At this time, a line connecting the rotation centers of the pivot 44a and the pivot 44c, a line connecting the rotation centers of the pivot 44c and the pivot 44d, a line connecting the rotation centers of the pivot 44d and the pivot 44b, and a pivot 44b and the pivot 44a. The line connecting the centers of rotation is a rectangle including a square or a symmetrical trapezoid, and when straight, the line connecting the centers of rotation of the pivots 44e and 44g, the center of rotation of the pivots 44g and 44h The line connecting the pivots 44h and 44f, the line connecting the pivots 44p and 44f, and the rotation of the pivot 44f and the pivot 44e. The line connecting the centers of the rectangles is a rectangle including a square, or a symmetrical trapezoid, and in the straight traveling state, the line connecting the centers of rotation of the pivots 44e and 44a and the centers of rotation of the pivots 44a and 44b are connected. The straight line, the line connecting the centers of rotation of the pivot 44b and the pivot 44f, and the line connecting the centers of the rotation of the pivot 44f and the pivot 44e are parallelograms, and when rotating straight, the rotation of the pivot 44c and the pivot 44g A line connecting the centers, a line connecting the centers of rotation of the pivots 44g and 44h, a line connecting the centers of rotation of the pivots 44h and 44d, and a line connecting the centers of rotation of the pivots 44d and 44c are parallel four sides. It is a shape.
In order to maintain this parallelogram, the bank angle adjusting rod 20 and the left and right uprights 14 and 15 or the left and right upper arms 16 and 18 or the left and right lower arms 17 and 19 are pivotally connected.

When running straight, the maximum bank angle can be set by the angle of the left and right upper and lower arms forming a parallelogram.
When straight, the angle of the left and right upper and lower arms is parallel to the road surface, that is, when the angle of the left and right upper and lower arms is 0 degrees. Every time. Although it is a tricycle that does not tilt at all and the steering is not effective for rear wheel steering, the angle of the bank of the vehicle body increases as the angle of the left and right upper and lower arms increases, and the angle of the left and right upper and lower arms increases The maximum bank angle cannot be set at 90 degrees.
This is because, when the left and right upper and lower arm angles are set to 0 degrees in a straight line state, if the vehicle body is banked even a little, the distance between the pivots 44e and 44g becomes short and the bank angle connecting the pivots 44e and 44g. The adjustment rod 20 cannot be shortened and a result bank cannot be formed. Further, when the left and right upper and lower arm angles are set to 90 degrees in the straight traveling state, the distance between the pivots 44e and 44g does not change no matter how banked, and as a result, the maximum bank angle cannot be set.
The angles of the left and right upper and lower arm are set in a range of 0 degree or more and less than 90 degrees in a straight traveling state. The bank angle has the maximum angle at which the line connecting the rotation centers of the pivot 44e and the pivot 44g intersects the rotation center of the pivot 44a or the pivot 44c.

There is another factor for setting the maximum bank angle, which depends on the ratio of the length of the line connecting the centers of rotation of the pivots 44e and 44a and the length of the line connecting the centers of rotation of the pivots 44a and 44c. The maximum bank angle changes.
When the length of the line connecting the rotation centers of the pivot 44e and the pivot 44a is equal to the length of the line connecting the rotation centers of the pivot 44a and the pivot 44c, the rotation of the pivot 44e and the pivot 44g is the maximum bank angle. The angle at which the line connecting the centers of the pivots intersects with the centers of rotation of the pivots 44a and 44c is equal to the angle of the line connecting the centers of rotation of the pivots 44e and 44a in the straight traveling state.
That is, when the distance between the mounting positions of the left and right upper and lower arms to the vehicle body and the length of the left and right upper and lower arms are 1: 1, banking is performed up to the set angle of the left and right upper and lower arms. I can do things.
However, when the line connecting the rotation centers of the pivot 44e and the pivot 44f coincides with a line that bisects the left rear wheel from the left and right.
The farther away from the line connecting the centers of rotation of the pivot 44e and the pivot 44f, the left and right bisecting lines when viewed from the rear, the smaller the maximum bank angle becomes, and conversely, the farther away from the inner line. If you do, the maximum bank angle will increase.
The maximum bank angle decreases as the ratio of the distance between the mounting positions on the vehicle body increases, and the maximum bank angle increases as the ratio of the lengths of the left and right upper and lower arms increases.

The difference between a bicycle that can be used as a baby buggy when folded and a bicycle that can be carried like a carry bag is that there is no head tube 3 and sprockets e and f. There is a cowl 39 and a storage case 40 that cover the front part of the front wheel and the chain wheel, and since the down tube is not slid when folded, there is no down tube pillar 10, double structure 33, multiple tubes 34, stopper 35, and crown 12 or less. The left and right or four rear forks 13 are held on the left and right to avoid interference with the front wheels when folded.
However, since the portion above the bending tube 4 becomes too long when folded as it is, the pivot 44i for folding the handle is provided at the stem 2 portion, and the brackets 41 and 42 and the lock mechanism 43 are provided at the folding position to fold the handle.
Although the shape of each part is different as described above, the other structures are the same, and the rear wheel that tilts when traveling is independent without tilting because the caster angle is raised when folded.

It is a side view of an example which can be used as a running state of a folding bicycle according to the present invention and a baby buggy during folding. It is the rear view of an example which showed the inclination system of the rear wheel at the time of the maximum inclination of the body of the folding bicycle concerning this invention. It is the side view of an example which showed the steering system of the folding bicycle which concerns on this invention. It is the side view and rear view of an example which can be carried like the traveling state of the folding bicycle which concerns on this invention, and a carry bag at the time of folding.

DESCRIPTION OF SYMBOLS 1 Handle 2 Stem 3 Head tube 4 Curved tube 5 Down tube 6 Bracket which connects a down tube and a chain stay 7 Bracket which supports a pedal and a crank 8 Crank 9 Pedal 10 Down tube pillar 11 Control tube 12 Crown 13 fixed to the control tube Crown Rear fork 14 fixed to the left Upright 15 that supports the left rear wheel Upright 16 that supports the right rear wheel Left upper arm 17 that connects the crown and upright by the link Left lower arm 18 that connects the crown and upright by the link 18 Crown and upright Right upper arm 19 connecting the link and the right upper arm 20 linking the crown and the upright link Bank angle adjustment rod 21 connecting the left and right upper or lower arms Chain stay 22 Bench seat 23 for infants Bracket for connecting bench seat to chain stay 24 Chain wheel 25 Seat tube fixed to chain stay 26 Seat pillar 27 Saddle 28 Bracket fixed to seat tube 29 Bracket fixed to down tube 30 Lock to connect or disconnect brackets Mechanism 31 Upper bearing 32 supporting the control tube in the head tube Lower bearing 33 supporting the control tube in the down tube Inner bevel gear 34 fixed to the center of the lower bearing 35 Bevel gear 35 fixed to the center of the upper bearing Double structure 36 of the control pipe to be operated Multiple tubes 37 corresponding to the input from the handle Stopper 38 to prevent the double structure from falling off Screw-type lower bearing 39 to prevent the control pipe from falling off 40 A cowl covering the front wheel and the chain wheel 40 Handle pedal Collect chains, rear wheels, etc. Case 41 Bracket 42 fixed on the handle side Bracket 43 fixed on the stem side Lock mechanism 44a for connecting or disconnecting brackets Pivot 44b provided on the upper left of the crown when viewed from the rear Pivot 44c provided on the lower left of the crown when viewed from the rear Pivot 44d provided at the upper right of the crown when viewed from the rear Pivot 44e provided at the lower right of the crown when viewed from the rear Pivot 44f provided at the upper portion of the left upright when viewed from the rear Pivot 44g provided at the lower portion of the left upright when viewed from the rear Pivot 44h provided at the upper part of the right upright as viewed from the rear Pivot 44i provided at the lower part of the right upright as viewed from the rear Pivot 45a when folding the handle Sprocket 45b receiving power from the pedal Sprocket 45c receiving power from the sprocket 45a Sprocket 45d coaxial with the procket 45b Sprocket 45e coaxial with the chain wheel 24 and receiving power from the sprocket 45c Sprocket 45f receiving power from the chain wheel 24 Sprocket 45g coaxial with the sprocket 45e Sprocket 46a receiving power from the sprocket 45f and transmitting it to the front wheels Down tube Pillar clamp 46b Sheet pillar clamp

Claims (7)

  Bicycles and motorcycles, which are bevel gears with one of them as an internal gear, changing the rotation ratio and rotation angle without changing the rotation direction, and transmitting the input from the steering wheel to the front or rear steering wheel.   The pivots at both ends connect the vehicle body and the left wheel, the left upper and lower arm are parallel, the pivots at both ends connect the vehicle body and the right wheel, the right upper and lower arms are also parallel, the pivots at both ends Bicycles and motorcycles that have the same distance between the centers of rotation and the left and right upper and lower arms have an angle greater than horizontal and less than upright with respect to a flat road surface when the vehicle body is upright.   When the distance between the rotation centers of the left and right pivots on the vehicle body side to which the left and right upper arms are attached is 1, the ratio between the rotation centers of the pivots at both ends of the upper arm according to claim 2 is a ratio of 10 or less, The distance between the pivot centers of the left and right pivots on the vehicle body side to which the left and right lower arms are attached is 1, and the distance between the pivot centers of the lower arms of the lower arm according to claim 2 is 10 or less. Motorcycle.   Adjust the length of the rod with pivots at both ends and the right and left of the upright, upper arm, or lower arm at a place other than the part where the arm is attached to the car body. Bicycles and motorcycles that are pivotally connected to each other.   Bicycles and motorcycles that are divided into a body that bisects a tube that connects a rear wheel as a steering wheel and a steering wheel and a frame that connects a front wheel as a driving wheel and a seat using the steering system according to claim 1 and folds at one fulcrum. .   A bicycle and a motorcycle for fixing a bench seat for two infants straddling a front wheel or a case for housing the vehicle body on the left and right sides of the front wheel to the vehicle body using the vehicle body of claim 5.   By using the link system of claim 2, claim 3, or claim 4 for the rear wheel that is a steering wheel, the setting ratio of claim 3, the setting angle of each arm of claim 2, and the angle are maintained. The maximum angle at which the rear wheel can be tilted is determined by the rod according to claim 4, and the two rear wheels that synchronize with the input from the steering wheel or the tilt of the vehicle body to the maximum angle when traveling, and the caster angle when folded according to claim 5 A bicycle that can stand up and stand as it stands without tilting the rear two wheels, and can be used as a baby buggy for two-seater infants or carried like a carry bag.

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