WO2003084807A1

WO2003084807A1 - Separable bicycle

Info

Publication number: WO2003084807A1
Application number: PCT/JP2003/003597
Authority: WO
Inventors: Shinichiro Ohkawa
Original assignee: Shinichiro Ohkawa
Priority date: 2002-04-09
Filing date: 2003-03-24
Publication date: 2003-10-16
Also published as: JP2004001700A; CN1638999A

Abstract

A separable bicycle capable of easily operating a handle, comprising a front frame (13) and a rear frame (6) formed so as to be connected to and disconnected from each other, the rear frame (6) further comprising a riding part (2) and a rotatingly driven rear wheel (3), the front frame (13) further comprising a pair of right and left front wheels (4) installed so as to be rotated around co-axes X on the right and left sides and a handle (5) for longitudinally swinging the rotating axes X of the front wheels (4) about a steering shaft (20), wherein, with the front and rear frames (13) and (6) connected to each other, the axis Y of the steering shaft (20) is positioned forward aslant relative to a vertical direction N.

Description

Specification

Separable bicycle

【Technical field】

The present invention relates to a separable bicycle.

[Background]

Conventionally, a bicycle that can be used as a general bicycle, or that can be used as a shopping cart or a baby carriage by separating the front and rear wheels as needed, and using only the front wheel as a shopping cart or baby carriage, etc. No. 1 4 1 5 9 1 (conventional example 1), Japanese Utility Model Publication No. 4 9-1 3 7 2 4 6 (conventional example 2).

Among these, the separable bicycle described in Conventional Example 1 includes a riding part, a rear wheel that is rotationally driven by human power by a driver riding on the riding part, and a pair of left and right provided in front of the riding part. A tricycle having front wheels and steering handles for the two front wheels.

The riding section and the rear wheel are provided on the rear frame, and both the front wheel and the handle are provided on the front frame, and the front and rear frames can be joined and detached.

Here, as shown in FIG. 20, the left and right front wheels 100 have a steering shaft P (that is, a center position when the steering wheel is operated) disposed along the vertical direction. It was designed to be held at a position that protruded diagonally forward, and by protruding in this way, a space S on which to put a shopping basket or a baby carriage body was secured.

When this conventional separable bicycle is used as a bicycle, as explained with reference to FIG. 20, the front wheel 10 0 is provided diagonally forward of the steering shaft P, so the front wheel when the handle is operated The movement of 100 (see the white arrow) is a swing (circular movement) with a radius r from the lower end of the steering shaft P to each front wheel 10 0 located diagonally forward.

In other words, horizontal skid friction that is clearly different from the direction of rotation (rolling) of the front wheels 100 acts on the portion where the lower end of the outer periphery of each front wheel 100 is in contact with the ground. It goes without saying that such horizontal skid friction is quite excessive. Nor.

As a result, these conventional separable bicycles have the problem that the steering shaft P is upright and the steering wheel is difficult to cut, making it difficult to drive.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a separable bicycle that can be easily and easily operated with a simple structure and is easy to ride.

DISCLOSURE OF THE INVENTION

In order to achieve the above object, the present invention has taken the following measures.

A separable bicycle according to the present invention includes a front frame 13 and a rear frame 6 that are detachably connected to each other, a riding portion 2 and a rear wheel 3 that is rotationally driven on the rear frame. A pair of left and right front wheels 4 provided on the frame 13 so as to be rotatable about the same axis X in the left-right direction, and a handle for swinging the rotation axis X of the front wheel 4 around the steering shaft 20 5 and the axis Y of the steering shaft 20 is inclined forward with respect to the vertical direction N in a state where the front and rear frames 1 3 and 6 are joined. .

Thus, if the axis Y of the steering shaft 20 is tilted forward, when the handle 5 is turned to the right (when steered), the rear frame 6 tilts to the right, and the handle 5 is When it is turned to the left (steering), the rear frame 6 tilts to the left. As a result, the center of gravity of the driver riding on the riding part 2 together with the riding part 2 becomes decentered with the inclination of the frame 6 to the left and right thereafter, and steering is hindered as a result. In addition, the steering wheel 5 can be easily operated by actively moving the center of gravity to the left and right and tilting the rear frame 6.

Further, the present invention is characterized in that the handle post 15 of the handle 5 is provided so as to be inclined backward with respect to the vertical direction in a state where the front and rear frames 13 and 6 are joined. The steering wheel operation from the riding part 2 becomes easy. The steering shaft 20 is preferably provided with respect to the front frame 13. Further, it is preferable that the handle 5 is attached to the handle post 15 so that the front / rear position can be adjusted, so that the handle 5 is detached from the time when the front frame 13 is joined to the rear frame 6. With that time, position the handle properly Will be able to.

[Brief description of the drawings]

FIG. 1 is a side view showing a bicycle according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part illustrating the movement of the front wheel when the handle is cut in the bicycle according to the first embodiment as viewed from the side.

FIG. 3 is an enlarged view of a main part illustrating the movement of the front wheel when the handle is cut in the bicycle according to the first embodiment as viewed from the front.

FIG. 4 is a side view showing a bicycle according to a second embodiment of the present invention.

Fig. 5 is a front view of the same.

Fig. 6 is a side view when the front frame is used alone.

FIG. 7 is a partial sectional side view of the connecting means.

FIG. 8 is a side view showing a separable bicycle according to a comparative invention. FIG. 9 is a view taken along the line AA in FIG.

FIG. 10 is a view taken along the line BB in FIG.

FIG. 11 is a side view of the main part when the rear frame bearing of the front frame is a steering shaft and the front frame engaging portion of the rear frame is a bearing portion.

FIG. 12 is a side view of the main part when the rear frame bearing of the front frame is a bearing portion and the front frame engaging portion of the rear frame is a steering shaft.

Fig. 13 is a plan view of the steering wheel operation in the bicycle according to the comparative invention.

FIG. 14 is a side sectional view showing a retaining mechanism employed when the rear frame bearing of the front frame is a steering shaft and the front frame engaging portion of the rear frame is a bearing portion.

Fig. 15 is a view taken along line C-C in Fig. 14 (slightly reduced).

Figure 1 6 is the same as Figure 1 4! ) —D line view.

FIG. 17 is a side sectional view showing the bag.

FIG. 18 is a side sectional view showing a usage example in which the specification of the bag of FIG. 17 is changed. Fig. 19 is a side sectional view depicting an example in which a suspension is provided on the steering shaft for easy comparison with Fig. 14. FIG. 20 is a plan view illustrating a steering wheel operation situation in a conventionally known separable bicycle.

BEST MODE FOR CARRYING OUT THE INVENTION

Before describing the separable bicycle according to the embodiment of the present invention, the form of the separable bicycle (comparative invention) having the same basic structure will be described with reference to FIGS. Further, the main part of the present invention will be described based on the embodiment shown in FIGS.

The separable bicycle 1 shown in FIGS. 8 to 10 is rotated after being driven by human power by a riding part 2 composed of a saddle and the like and a driver (not shown) riding on the riding part 2. The vehicle includes a wheel 3, a pair of left and right front wheels 4 provided in front of the riding portion 2, and a steering handle 5 for both the front wheels 4. Riding part 2 and rear wheel 3 are provided for rear frame 6.

The rear frame 6 has a central post 7 that holds the riding part 2 so that the height can be adjusted, and a bifurcated triangular frame on the rear side of the center post 7 to hold the rear wheel 3 in a rotatable manner. And a back fork portion 8. Further, a pedal device 9 is attached to the rear frame 6 so as to reach the position of the driver's foot seated on the riding section 2, and a chain or the like for transmitting the force applied to the pedal device 9 to the rear wheel 3 is provided. Transmission means 1 0 is installed.

On the other hand, the front wheels 4 and the handle 5 are provided on the front frame 13. The front frame 13 includes a shaft support 杆 14 that connects the left and right front wheels 4 between the rotation center portions thereof, and a pair that holds the handle 5 by rising upward from a longitudinal intermediate portion of the shaft support 杆 14. It has a handle post 1 5. Note that the front wheel 4 is rotatably held around the axis X in the left-right direction at both ends of the shaft support rod 14. The front frame 13 and the rear frame 6 can be joined to and detached from each other.

This joint portion is composed of a rear frame receiver 17 provided on the front frame 13 and a front frame engaging portion 18 provided on the rear frame 6.

As shown in FIG. 11, the rear frame receiver 17 of the front frame 1 3 is formed as a circular shaft that protrudes upward along the vertical line, and this can be used as the steering shaft 20. Yes. At this time, the front frame engaging portion 18 of the rear frame 6 is formed as a cylindrical bearing portion 2 1 that is rotatably fitted with the steering shaft 20 pierced from the bottom to the top. Can do.

In this case, the assembly procedure of the front frame 1 3 and the rear frame 6 is as follows. The front frame of the rear frame 6 from above the rear frame receiver 1 7 (steering shaft 2 0) of the front frame 1 3 The engaging portion 1 8 (bearing portion 2 1) is covered. As another structure, as shown in FIG. 12, the front frame engaging portion 18 of the rear frame 6 is formed as a circular shaft that protrudes downward, and this is formed on the steering shaft 20. It is also possible to do. At this time, the rear frame bearing 17 of the front frame 13 is formed as a cylindrical bearing section 21 that fits the steering shaft 20 from the top to the bottom and is rotatably fitted. Become.

In this way, when the fitting relationship between the front frame engaging portion 18 and the rear frame receiver 1 相対 is relatively reversed with respect to the “shaft” and “bearing”, the assembling procedure is still after the front frame 1 3. The frame receiver 17 (bearing portion 2 1) is covered with the front frame engaging portion 1 8 (steering shaft 2 0) of the rear frame 6 from above. This is because when the weight of the driver who rides on the riding section 2 is loaded on the rear frame 6, there is a force in the direction in which the front frame engaging section 18 and the rear frame receiver 17 are detached. This is to prevent it from being applied.

As is clear from FIGS. 9 and 10, the rear frame receiver 17 of the front frame 1 3 is provided at the center position in the left-right direction of both front wheels 4. In other words, the three of the left and right front wheels 4 and the rear frame receiver 17 are aligned in a straight line on the rotational axis X of the left and right front wheels. After that, the frame receiver 17 has the function as the steering shaft 20 or the bearing portion 21 (the function as the center position (steering axis Y) during steering) as described above. And the rotational axis X of the left and right front wheels 4 intersect each other.

Therefore, when the handle 5 is operated, each front wheel 4 is steered as a swing of the shaft support rod 14 having the center Y of the rear frame receiver 17 as an axis Y as shown in FIG. Become. Accordingly, the movement of each front wheel 4 during this steering is a circular movement with a radius R from the rear frame receiver 17 to each front wheel 4 positioned in the left-right direction. However, this arc movement is along the direction of rotation (rolling) of the front wheels 4. Therefore, unlike the separable bicycle shown in the prior art (see Fig. 20), the horizontal skid friction hardly acts, so the steering wheel operation becomes extremely easy. In addition, the structure is very simple.

By the way, with the separable bicycle shown in the prior art, as a measure to prevent these from unintentionally separating when the front and rear frames are joined, the conventional example 1 is connected to the connecting pipe. A structure was adopted in which the retaining pin was fastened to this connecting part with the part (shaft) inserted, but this was troublesome to handle and the retaining pin was not There was a drawback of being noisy. On the other hand, no measures were taken in Conventional Example 2 and there was a problem with safety.

Therefore, in the separable bicycle of this example, as shown in FIGS. 14 to 16, the rear frame receiver 1 前 of the front frame 1 3 is the steering shaft 20, and the front frame mechanism of the rear frame 6 is When the joint portion 18 is the bearing portion 21 (as shown in FIG. 11), that is, the rear frame receiver 17 is the steering shaft 20 protruding upward, and the front frame is engaged with this. In the case where the portion 18 is a bearing portion 21 in which the steering shaft 20 can be pierced from below to above, a retaining mechanism 24 is provided for the steering shaft 20. Of these, as shown in FIG. 14, it is assumed that the steering shaft 20 is provided with a stopper portion 22 around the outer peripheral surface thereof for holding the bearing portion 21 at a predetermined height. is there. In addition, the bearing 21 has a built-in ball bearing 23 so that the steering shaft 20 can be freely rotated and rotated easily. The bearing 2 3 has a slightly loose fitting relationship to facilitate attachment and detachment with the steering shaft 20, and in this way, the bearing portion 2 1 and the steering shaft 2 0 The stress concentration at the joint with can be relaxed.

The above-described retaining mechanism 24 can be bent at a portion where the steering shaft 20 protrudes upward from the bearing portion 21 and is engaged with the upper surface of the bearing portion 21 by the steering shaft 20 itself. It is for stopping. In this example, in order to make the operability good and reliable, that is, the operation with motivation can be done lightly, while the anti-separation action when external force is applied is ensured. It is assumed that a toggle mechanism is adopted. That is, the steering shaft 20 is separated into a root side shaft 2 6 and a tip broken shaft 2 7 via a pivot 25 perpendicular to the axis of the steering shaft 20, so that the tip folded shaft 2 7 is about 180 °. The angle range can be bent freely. Further, the distal end bending shaft 27 is alternately provided with engaging recesses 30 and cam peaks 31 so as to surround the periphery of the pivot shaft 25 in the bending operation direction. There are three engagement recesses 30 in total, and each engagement recess 30 is positioned so that it faces downward when the tip folding shaft 2 7 is upright and when it is bent to the side. It has been.

On the other hand, the root shaft 26 is provided with a stopper shaft 3 2 that protrudes from the lower side of the pivot 25 toward the pivot 25, and the stopper shaft 3 2 is supported by the spring 3 3. It is biased upward. The stopper shaft 32 can be engaged with the engagement recess 30.

Therefore, when the front frame 13 and the rear frame 6 are joined, the front end broken shaft 2 7 of the steering shaft 20 is set upright in advance, and the bearing portion 21 is fitted to the steering shaft 20 before steering. Bend the tip bending shaft 2 7 of the shaft 20 to make it turn sideways.

At the time of this bending, the stopper shaft 3 2 is pushed down downward against the spring 3 3 in order to get over the cam crest 3 1, but after getting over the cam crest 3 1, When they match, the panel 3 3 projects upward due to the pushing-up biasing force of the panel 3 3, and as a result, the mating engagement recess 3 0 (the tip folding shaft 2 7 is directed downward in a state of being sideways) It will engage with the engaging recess 30).

When this happens, the bent end shaft 2 7 (shown by a two-dot chain line) that has turned sideways is engaged with the upper surface of the bearing portion 21, and a retaining action can be obtained. . The retaining action obtained at this time exhibits a strong retaining action even when an external force is applied, for example, when only the rear frame 6 is lifted. As shown in Fig. 8, etc., the front frame 13 is configured to allow the bag 40 to be loaded in the space formed between the front wheel 4 and the left and right front wheels 4 at the front of the handle post 15. it can. The bag 40 may have a structure in which a front cargo bed 41 is provided so as to project forward from the front frame 13 and is placed on the front cargo bed 41. In this way, the front frame 1 3 and the rear frame 6 are separated. In this case, the front frame 13 can be used as it is as a shopping cart or a simple transport vehicle.

For example, when you go to the supermarket etc. by riding the bicycle 1 above, separate the front frame 1 3 and the rear frame 6 at the bicycle parking lot of the store, park the rear frame 6 only on the spot, and the front frame 1 3 It is possible to bring it into the store as it is. In the store, the purchased goods should be packed into the front loading platform 41 or bag 40 of the front frame 13 without using the cart attached to the store.

Therefore, at the cash register, it is only necessary to pack the purchased item once taken out of the cart into the front loading platform 4 1 or bag 40 of the front frame 1 3 again, and after leaving the store, this front frame 1 Join 3 to the rear frame 6 again and ride as a bicycle 1 as it is. Therefore, unlike conventional ones, it is troublesome to refill the bag for take-away bags provided by the store side while examining the shape, hardness, softness, and temperature difference of the purchased item. In addition, it is no longer necessary to devise a way to place this bag on a conventional bicycle in a stable manner. In addition, since no take-away bag is required, the store side can save money, and it can be reflected in the product price (lower price) and can also reduce the garbage problem. Various advantages will be obtained.

In addition, when the rear frame 6 is parked at the bicycle parking lot, the absence of the front frame 1 3 means that there is no handle 5 that leads to waste of the parking space, so that parking is much more. This also leads to the advantage that the wheel space can be used effectively.

As shown in FIG. 8, the rear frame 6 is preferably provided with a stand 60 so that parking after separation from the front frame 13 can be performed easily and stably. The stand 60 may be flipped up or detachable so as not to interfere with the traveling of the bicycle 1.

In order to make the front frame 13 3 more convenient for use as a shopping cart or a simple transport vehicle as described above, it is only necessary to provide a cassage 4 3 on the front end side of the front loading platform 41. This Cass evening 4 3 should be able to swing freely In addition, it is preferable that the brake 44 be applied as required. This cast evening 43 must be lifted as shown in FIG. 8 when the front frame 13 and the rear frame 6 are joined. At this time, the handle post 15 is tilted backward with respect to the vertical line N, so that the handle 5 can be easily operated.

It is preferable that the front loading platform 41 has a cage structure so that it can support not only the bottom of the bag 40 but also surround the outer periphery thereof. The bag 40 is preferably detachable from the front loading platform 41 and is equipped with an appropriate locking mechanism (not shown) so that the loaded state can be locked to prevent snagging. It is suitable to stop.

Fig. 17 shows an example of the bag 40, and Fig. 18 shows a situation where the bag 40 specification is used instead.

The bag 40 includes a lid portion 47 that can be opened and closed by a fastener, a hook, a button, a hook-and-loop fastener, etc. (not shown). When the lid portion 47 is opened, the midsole 4 is formed in the middle in the depth direction. 8 is provided. This insole 48 is also detachable at one end with fasteners, hooks, buttons, hook-and-loop fasteners (not shown), etc. The shape and hardness of the stored items (purchased items, etc.), temperature difference, etc. It is possible to select whether to use the insole 4 8 according to the situation.

In addition, on the back side of the insole 48, there is a partitioning material 49 for making a step, and the front end of the partitioning material 49 has a fastener, hook, It is detachable with buttons, hook-and-loop fasteners (not shown). Therefore, it is possible to store items that are easy to break, such as eggs, or items that you want to store separately from other stored items, such as hot and cold items, in the interior surrounded by this partition material 49. Yes. Note that FIG. 17 shows a side sectional view, but an insole 48 and a partition material 49 may be provided so as to have the same form as seen from the front.

FIG. 19 shows an example in which a suspension 5 2 is provided on the steering shaft 20 of the front frame 13 described above. The suspension 52 uses a spring having a large diameter on the upper side and a small diameter on the lower side, and is fixed to the bearing portion 21 of the rear frame 6 via a spring mounting ring 53 on the lower surface side. Also under this suspension 5 2 A washer 5 4 that is engaged with the upper surface of the shaft support rod 14 of the front frame 13 is attached to the end. This washer 54 is formed with a hole that allows the steering shaft 20 to pass therethrough, so there is no problem when the front frame 13 and the rear frame 6 are joined and detached.

In order to provide the suspension 52, unlike the case shown in FIG. 14, it is assumed that the steering shaft 22 is not provided on the steering shaft 20 of the front frame 13. Further, the suspension 52 may be fixed to the steering shaft 20 side of the front frame 13 or a spring having a uniform winding diameter may be used vertically.

In the rear frame 6, the main frame portion 6 1 provided to connect the front and rear of the front wheel 4 and the rear wheel 3 is vertically moved by interposing a pivotal portion by a left and right shaft or an interference material such as rubber. A refraction or elastic joint (not shown) that allows the bending of the frame to be allowed within a predetermined range is provided to alleviate the stress concentration at the joint between the rear frame receiver 17 and the front frame engaging portion 18, You may make it aim at improvement of riding comfort and drivability.

It is not limited that the front loading platform 41 is provided at the front portion of the front wheel 4 and the bag 40 is placed on the front loading platform 41. Therefore, it is possible to load the bag 40 without the front loading platform 41, or to provide only the front loading platform 41 without providing the bag 40. Further, the front cargo bed 41 may be provided with a structure (such as a super car, a baby carriage, etc.) for placing specific items.

The above is the form according to the comparative invention. Next, the first embodiment of the separable bicycle according to the present invention will be described while paying attention to the difference from the above form. Except for this difference, the same configuration as that shown in FIGS. 8 to 19 is adopted and the same operational effect is obtained, so that detailed description will be omitted.

As shown in FIGS. 1 to 3, in the separable bicycle according to this embodiment of the present invention, a riding portion 2 made of a saddle, a rear wheel 3, a pair of left and right front wheels 4, a steering handle 5 and The riding part 2 and the rear wheel 3 are provided for the rear frame 6. After this, the frame 6 has a center post 7 and a back fork portion 8, to which the pedal device 9 and the transmission means 10 are attached, and the driver who sits on the riding portion 2 with his foot Rowing 9 will drive rear wheel 3 via transmission means 10 It ’s a sea urchin.

The left and right front wheels 4 and the handle 5 are provided on the front frame 1 3, and the front frame 1 3 has a shaft support rod 1 4 and a handle post 1 5, and the left and right front wheels 4 are both ends of the shaft support rod 1 4. Is held so as to be rotatable about the same axis X in the left-right direction. The front frame 13 and the rear frame 6 can be joined to and detached from each other. A front cargo bed 41 and a bag 40 are provided at the front of the front frame 13, and a stand 60 is provided at the rear frame 6. Although not shown, a cass evening 44 can be provided at the lower part of the front loading platform 41 as in the case of the separable bicycle described above. These structures are the same as those shown in FIGS. In the embodiment of the present invention, the axis Y of the steering shaft 20 provided at the joint between the front frame 13 and the rear frame 6 is in a forward inclined state with respect to the vertical line N. This point is different from the separable bicycle according to the comparative invention. As is clear from Fig. 2, the angle Q (Cass evening angle) formed by the steering axis Y of the steering shaft 20 with respect to the vertical line N is the front side of the bicycle 1 with respect to the vertical line N (Fig. 2). It appears to the left of the vertical line N). For reference, in the case of a general-purpose bicycle (not shown), all corners of the cass appear on the side shown as the inclination of the handle post 15 in Fig. 2 (the right side of the vertical line N). .

In other words, assuming that the angle of the cass of a general bicycle is generated in the positive direction with respect to the vertical line N, in the present embodiment, the angle Q (Cass of the cass) is generated in the minus direction. I can say that.

In the present embodiment, the steering shaft 20 is formed as the rear frame receiver 17 of the front frame 13, and accordingly, the front frame engaging portion 18 of the rear frame 6 is used as the bearing portion 21 ( The structure pattern shown in Fig. 1 1) is adopted, but the fitting relationship between the front frame engaging part 18 and the rear frame receiver 17 is reversed relative to the "shaft" and "bearing". (The structure pattern shown in Fig. 12) is also possible.

In the bicycle 1 according to the present embodiment having such a configuration, the left and right front wheels 4 have a steering axis Y whose rotation axis X (shaft support rod 1 4) connecting them tilts forward when the handle 5 is turned. It moves in an inclined plane with the center at the center.

Therefore, at this time, for example, it is assumed that the handle 5 is turned to the left in FIG. Then, the left front wheel 4A tries to move obliquely upward and the right front wheel 4B tries to move diagonally forward and downward.

Of course, as shown in Fig. 3, the left and right front wheels 4 (4 A and 4 B) actually try to maintain a grounded state, so the left front wheel 4 A as described above can be moved diagonally upward. The right front wheel 4 B is moved obliquely downward, not as a vertical movement of the two front wheels 4 (4 A, 4 B), but on the left side of the rear frame 6 due to the leftward movement (α) of the steering shaft 20. It appears as a slope to (right side in Fig. 3). Therefore, as the frame 6 tilts to the left side thereafter, the riding section 2 also tilts in the same direction.

As is clear from this, when the steering wheel 5 is turned to the left and the course is turned to the left, as the rear frame 6 and the riding part 2 tilt to the left side, the driver who rides on the riding part 2 Similarly, it tilts to the left, which causes the driver's center of gravity to decenter downward. In other words, for the centrifugal force that acts when the bicycle 1 tries to turn to the left, the driver moves the center of gravity in the direction opposite to the direction of the centrifugal force, resulting in a hiccup. . Even when driving at high speeds, it is possible to bend the curve stably without significantly reducing the speed. In addition, the driver can easily operate the handle 5 by actively moving the center of gravity to the left and right and tilting the rear frame 6.

Of course, when the handle 5 is turned to the right, the rear frame 6 is tilted to the right as opposed to the above, so that the same effect can be obtained.

The tilt angle Q of the steering shaft 20 is preferably 0 ° and Q≤10 °, and more specifically 2 ° ≤Q ^ 4 °. Further, the steering shaft 20 is inclined forward, whereas the handle post 15 is inclined backward with respect to the vertical line N.

In this embodiment, the steering axis Y and the rotation axis X of the left and right front wheels 4 are in an intersecting relationship. Therefore, as in the comparative invention, the movement of each front wheel 4 during steering is a circular movement with a radius R from the steering axis Y to each front wheel 4 positioned in the left-right direction. Because it is along the direction of rotation (rolling) of No. 4, the side sliding friction like the separable bicycle shown in the prior art (see Fig. 20) hardly acts, and the handle operation is extremely It becomes easy. The retaining mechanism 24 provided on the steering shaft 20 is also employed in this embodiment in the form shown in FIG. 14 or FIG. Further, in the present embodiment, the steering shaft 20 can be formed in a conical shape with the upper side tapered, and the bearing portion 21 into which the steering shaft 20 is inserted can be formed in a conical hole shape corresponding thereto. This makes it possible to easily and reliably join the two.

4 to 7 show a second embodiment of the present invention.

As in the above-described embodiment, the bicycle 1 includes a riding part 2 composed of a saddle and the like, a rear wheel 3 that is rotationally driven by human power by a driver (not shown) riding on the riding part 2, A pair of left and right front wheels 4 provided in front of the riding part 2 and steering handles 5 for the two front wheels 4 are provided. The riding part 2 and the rear wheel 3 are provided with respect to the rear frame 6. .

The rear frame 6 is configured to form a bifurcated triangular frame 7 on the rear side of the central post 7 that holds the riding portion 2 so that the height can be adjusted, and the rear wheel 3 is rotatable. And a back fork portion 8 to be held in the housing. Further, a pedal device 9 is attached to the rear frame 6 so as to reach the position of the driver's foot seated on the riding section 2, and a chain or the like for transmitting the force applied to the pedal device 9 to the rear wheel 3 is provided. Transmission means 1 0 is installed.

On the other hand, the front wheels 4 and the handle 5 are provided on the front frame 13. The front frame 13 includes a support frame 65 that supports a pair of left and right front wheels 4. The support frame 65 includes a main member 6 6 disposed in the left-right direction, and a main member 66. Support members 67 extending downward from both ends are provided, and the main member 66 and the support member 67 are integrally formed by bending a bar material such as a pipe material. A pair of left and right handle bolts 15 are provided on both the left and right sides of the main member 6 6 and inside the left and right support members 6 7 so as to extend upward. The upper ends are connected by horizontal rods 68. The horizontal rail 68 and the handle post 15 are integrally formed by bending a bar material such as a pipe material.

A handle 5 having grip portions 69 on both left and right ends is connected to the horizontal rod 68 via a connecting member 70. The connecting member 70 swings back and forth with respect to the horizontal rod 68. It is freely mounted and can be positioned at a predetermined position, so that the position of the handle 5 can be adjusted back and forth.

A front wheel 4 is rotatably supported by the lower portions of the left and right sides of the support frame 65. Specifically, the support frame 6 5 and the handle post 15 are provided with a front loading platform 41 and a shaft 7 between the frame body 7 1 and the support frame 65 constituting the loading platform 4 1. 2 is installed and the front wheel 4 is rotatably supported. Further, the right front wheel 4 (4 B) and the left front wheel 4 (4 A) are rotatably supported around the same axis X in the left-right direction.

The frame 7 1 of the front loading platform 4 1 includes a pair of left and right rear frame members 7 3 extending downward from the left and right sides of the main member 6 6 of the support frame 65, and a front from the lower end of the left and right rear frame members 7 3. Left and right lower frame members 7 4 extending from the front ends of the left and right lower frame members 74, and curved to the rear at the upper ends thereof and connected to left and right handle posts 1 5 7 5 The shaft 7 2 of the front wheel 4 is installed on the support member 6 7 of the support frame 65 and the rear frame member 73 of the frame body 7 1. In addition, the left and right rear frame members 7 3, the lower frame member 7 4, and the front frame member 75 are connected to each other by a horizontal frame member at appropriate places.

At the lower part of the frame body 71, a net body 76 is provided on the outer periphery 4 side and the bottom surface, and these form a cargo bag capable of accommodating the load. A support base 7 7 on which a basket or the like can be placed is formed. Further, a bag 40 as shown in FIGS. 17 and 18 may be provided on the front loading platform 41. A steering shaft 20 is provided via a mounting body 78 at the center in the left-right direction of the main member 6 6 of the support frame 65, and a connecting member is connected to the steering shaft 20 via a bearing or the like. 7 9 is pivotably connected around the axis Y with the stopper secured. Conversely, a steering shaft 20 may be provided on the connecting member 79 side, and the attachment body 78 side may be rotatably connected to the steering shaft 20 via a bearing.

The connecting member 7 9 is a part that is connected to the rear frame 6 so as to be joined and detached, and the front end of the main bone portion 61 in the rear frame 6 and the rear end of the connecting member 7 9 are connected to the connecting means 8. It is connected via a zero so that it can be joined and detached.

FIG. 7 shows an example of the connecting means 8 0. A cylindrical connecting body 8 1 is fixed to the front end portion of the main bone portion 61, and a circle is provided on the outer periphery of the connecting body 8 1. Arc-shaped receiving recess 8 A plurality of 2 are formed at equal intervals in the circumferential direction.

On the other hand, the connecting member 79 is provided with a cylindrical connected body 83 that protrudes rearward, and the connecting body 81 can be removably inserted into the cylinder of the connected body 83. It has become. A plurality of spheres 84 that can be accommodated in the respective accommodating recesses 82 are held on the distal end side of the coupled body 83 so as to be movable in the radial direction of the coupled body 83.

A cylindrical operation member 85 is externally fitted to the outer peripheral portion of the coupled body 83, and the spherical body 84 is not detached from the housing recess 82 by contacting the inner peripheral surface of the operation member 85. It has become.

An urging member 86 made of a compression coil panel is fitted on the outer periphery of the coupled body 83, and the operation member 85 is urged toward the rear frame 6 by the urging member 86. On the base portion of 81, a stubber 87 that restricts the movement of the operation member 85 toward the rear frame 6 is formed as a step. The urging member 86 is covered with a bellows-shaped covering member 90.

The operation member 85 is provided with an unlocking portion 8 8 that allows the sphere 8 4 to be detached from the receiving recess 82, and this unlocking portion 8 8 is formed on the inner peripheral surface of the operation member 85. It is configured by forming an inclined surface that enlarges the inner peripheral diameter on the rear frame 6 side.

When the operation member 85 is moved to the front frame 13 side against the biasing member 86 and the inclined surface of the unlocking portion 8 8 is positioned at the position of the sphere 8 4, the sphere 8 4 Then, the sphere 8 4 is detached from the housing recess 82 2 by moving the connecting body 81 and the connected body 8 3 away from each other. As a result, the connected body 81 and the connected body 83 are completely separated.

The connecting body 8 1, the connected body 8 3, and the operation member 8 5 can be detachably attached with anti-rotation pins 8 9 that pass through them. The relative rotation of the connected body 81 and the connected body 83 is restricted.

The configuration of the connecting means 80 is not limited to the above, but a method of connecting the main bone portion 61 and the connecting member 79 using pins, bolts, or the like, and connecting the main bone portion 61 and the connecting member 79 to the front and rear (At this time, it may be bonded with a magnet) Conventionally known methods such as a method of connecting, a method of screwing the outer peripheral portion of the main bone portion 61 and the connecting member 79 using a bag nut or the like can be adopted.

As shown in FIG. 4, the axis Y of the steering shaft 20 is aligned with the vertical line N when the front and rear frames 1 3 and 6 are joined (the state during travel), as in the first embodiment. On the other hand, it is in a forward leaning posture with the upper side positioned forward.

That is, the angle Q (Cass evening angle) formed by the steering axis Y of the steering shaft 20 with respect to the vertical line N is the front side of the bicycle 1 with respect to the vertical line N (the vertical line N in FIG. 4). It has appeared to the left).

Similarly to the case described with reference to FIGS. 2 and 3 for the bicycle 1 of this embodiment having such a configuration, the rotation axis X of the left and right front wheels 4 tilts forward by turning the handle 5. The rear frame 6 is tilted to the left and right by the left and right swinging of the steering shaft 20 caused by swinging back and forth while centering on the steering axis Y.

Therefore, when turning the steering wheel 5 to the left or right, the rear frame 6 and the riding part 2 are inclined in the same direction, and accordingly, the driver's weight on the riding part 2 is eccentric. Become.

As a result, the driver moves the center of gravity in the direction opposite to the direction of the centrifugal force against the centrifugal force that acts when the bicycle 1 tries to push the force. I'll be silly. In addition, even when driving at high speeds, the carp can be stably turned without significantly reducing the speed.

In addition, the driver can easily operate the steering wheel by actively moving the center of gravity to the left and right and tilting the rear frame 6.

The tilt angle of the steering shaft 20 (cass evening angle) is preferably 0 ° and Q 10 0 °, more specifically 2 ° ≤Q≤4 °, as in the first embodiment. Is preferred. The handle post 15 is inclined backward with respect to the vertical line N. In the present embodiment, the axis Y of the steering shaft 20 and the rotational axis X of the front wheel 4 are not in a crossing relationship, but the rotational axis X is greatly separated from the steering axis Y. However, the steering shaft 20 and the rotational axis X are positioned substantially corresponding to each other in the vertical direction. For this reason, the horizontal skid friction of the front wheel 4 when the steering wheel 5 is operated does not adversely affect the steering operation due to the tilt of the steering axis Y. Yes.

By the way, the present invention is not limited to the above-described embodiments, and can be appropriately changed according to the embodiments. For example, the rear wheel 3 can be a four-wheeled bicycle with a pair of left and right wheels. In addition, it is not limited to those driven only by human power, but can be an electric or electric assist type bicycle.

[Industrial applicability]

The present invention can be used as a general bicycle, or can be used as a shopping cart, a baby carriage, or the like only by separating the front wheel and the rear wheel as necessary.

Claims

The scope of the claims

1. The front frame (13) and the rear frame (6) are provided so that they can be joined and detached. The rear frame (6) is provided with a riding part (2) and a rear wheel (3) that is driven to rotate. A pair of left and right front wheels (4) provided on the front frame (13) so as to be rotatable about the same axis (X) in the left-right direction, and the rotation axis (X) of the front wheel (4) (20) and a steering wheel (5) that swings back and forth, and the axis (Y) of the steering shaft (20) is vertically aligned with the front and rear frames (13, 6) joined together. N) A separable bicycle characterized in that it is inclined forward with respect to N).

2. The handle post (15) of the handle (5) with the front and rear frames (13, 6) joined to each other is provided with a rearward inclination with respect to the vertical direction (N). Item 1. A separable bicycle according to item 1.

3. The separable bicycle according to claim 1, wherein a steering shaft (20) is provided for the front frame (13).

4. The separable bicycle according to any one of claims 1 to 3, wherein the handle (5) is attached to the handle post (15) so that the front-rear position can be adjusted.