WO1990001441A1

WO1990001441A1 - Wheel system for flat ground, stairs and irregular ground

Info

Publication number: WO1990001441A1
Application number: PCT/JP1989/000814
Authority: WO
Inventors: Minoru Sato
Original assignee: Kusakari, Tateki
Priority date: 1988-08-09
Filing date: 1989-08-09
Publication date: 1990-02-22

Abstract

A wheel system provided on a cargo-carrying handcart and capable of being moved even on the stairs and irregular ground as well as flat ground. An auxiliary wheel (8) is fixed rotatably to the free end portion of a front arm (6) of a wheel mount (4), and a main wheel (9) to the free end portion of a rear arm (7) of the same mount (4). A slide shaft (11) fixed to a connecting member (2) on the side of a handcart body (1) is fitted slidably in an elongated bore (10) provided in the wheel mount (4), whereby the wheel mount (4) is secured to the handcart body (1).

Description

Akira Itoda Wheel devices for flat terrain, stairs and irregular terrain

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device that can travel on flat ground, stairs, and uneven terrain. Background art

As this kind of prior art, Japanese Patent Application Laid-Open No. 48-64651 discloses a device capable of moving up and down stairs instead of a conventional wheel device for traveling on flat ground having only a large-diameter main wheel. JP-A-51-16302 and JP-A-52-27807 are known.

In these disclosed prior arts, an arm is radially mounted around an axle at an equal angle radially, and wheels are rotatably mounted at the tip of the arm. It goes up and down the steps.

However, these prior arts have a large number of three to six wheels mounted around the axle, so they are large in diameter and heavy, and purple when stored when not in use. In some cases, the climbing operation was not smooth, and there was no versatility, such as lack of directional flexibility because the four wheels touched down on flat terrain.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and has been made to solve the problem. An object of the present invention is to provide a wheel device that can be configured to be compact and lightweight by adding products, and that can be smoothly operated not only for traveling on flat ground, but also for ascending and descending on stairs of various steps or on uneven terrain. Disclosure of the invention

According to the present invention, a small-diameter sub-wheel is mounted on the front end of a front arm formed on a group wheel mounting body, a large-diameter main wheel or a small-diameter sub-wheel is mounted on a rear arm distal end, and the wheel mounting body is transported. A wheel device characterized by being rotatably mounted on a connecting body mounted on a lower surface of a vehicle body. By installing this wheel device on a transport vehicle, it is possible to travel not only on flat ground, but also up and down steps and uneven terrain with irregularities.

The present invention also provides a small-diameter auxiliary wheel on a front arm formed on a wheel mounting body, a large-diameter main wheel on a rear arm, and a large-diameter main wheel rotatably mounted on the rear arm. A wheel device characterized in that a long hole is formed in the long hole, and a slide shaft of a connecting body attached to the main body is slidably fitted into the long hole.

According to the present invention, a small-diameter auxiliary wheel is rotatably mounted on a front arm formed on a wheel mounting body, and a large-diameter main wheel is rotatably mounted on a rear arm. Since the hole is formed and the slide shaft of the connecting body attached to the main body is slidably fitted in the long hole, the wheel mounting body is rotatable with respect to the connecting body, so that it is not only flat, but also stairs. This makes it possible to travel on uneven terrain with irregularities.

The present invention also provides a small-diameter sub-wheel at the tip of the arm formed on the wheel mounting body and a large-diameter main wheel at the tip of the rear arm. In addition, an elongated hole is formed in the front-rear direction near the rear of the main wheel of the rear arm, and a slide shaft of a connecting body attached to the main body is slidably fitted in the elongated hole. The present invention is characterized in that a small-diameter auxiliary wheel is formed at the front end of a front arm formed on a wheel mounting body, and a large-diameter main wheel is rotatably mounted at a front end of a rear arm. A long hole is pitted in the front-rear direction close to the rear of the main wheel, and the slide shaft of the connecting body attached to the main body is slidably fitted into the long hole. The rest is rotatable with respect to the connected body, and it is possible to run not only on flat ground, but also on stairs up and down and uneven terrain with irregularities.

Further, the present invention provides a wheel device in which a large-diameter main wheel is rotatably connected to a coupling body attached to a lower surface of a main body, wherein a front arm and a rear arm are formed in an arch shape, and the two arms are respectively provided at the tip ends of both arms. A wheel mounting body on which a small-diameter auxiliary wheel is rotatably pivoted is rotatably mounted on the connecting body in front of the main wheel, and is always attached to the mounting portion so that the front arm approaches the main body side. A wheel device characterized by attaching a biasing biasing means.

The present invention relates to a wheel device in which a large-diameter main wheel is rotatably mounted on a connecting body attached to a lower surface of a main body, a front arm and a rear arm are formed in an arch shape, and small diameters are provided at both ends of the arms. A wheel mounting body rotatably pivoted with the auxiliary wheel is rotatably mounted on the connecting body in front of the main wheel, and the front arm is constantly urged to the mounting portion so that the front arm approaches the main body lavage. Since the biasing means is mounted, the wheel mounting body can rotate with respect to the connecting body, and can travel not only on flat ground, but also on stairs, up and down stairs, and uneven terrain with irregularities. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a view of a lavatory when stored in the first embodiment of the present invention, Fig. 2 is a side view of the same when traveling on level ground, and Figs. The J-side view of FIG.

FIG. 10 is a vertical cross-sectional view of the second embodiment of the present invention at the time of storage, FIG. 11 is a rear view partially cut away as viewed from the direction shown by the arrow in FIG. 10, and FIGS. Fig. 9 shows a measurement plan of the operation over time when going up and down the stairs.

FIG. 20 is a vertical cross-sectional view of the third embodiment of the present invention at the time of storage, FIG. 21 is a plan view also seen from the bottom, and FIGS. FIG. 3 shows a schematic view of a lavatory in an operating state over time.

FIG. 27 is a longitudinal sectional side view of the fourth embodiment of the present invention, and FIG. 28 is a schematic lavatory view of the same operating state when the stairs are ascending. BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention shown in the drawings will be described in detail below.

In the first embodiment shown in FIGS. 1 to 9, the wheel device of the present invention is mounted on a hand car for carrying luggage, and the pair of wheel devices are independently operated on the left and right lavages of the hand car body. In this case, only one wheel device is shown in the drawing.

Reference numeral 1 denotes a main body having the best hand force. A connecting body 2 is provided at a rear portion of a lower surface of the main body 1 and a buffering regulating body 3 is provided in front of the connecting body 2.

4 is a plate-shaped wheel mounting rest, which is V-shaped forward from the base end 5 An arm 6 and a rear arm 7 are formed so as to protrude. A small-diameter auxiliary wheel 8 is rotatably mounted on the front arm 6, and a large-diameter main wheel 9 is mounted on the rear arm 7. It is rotatably mounted on the shaft. A long hole 10 is provided at the base end 5 in the front-rear direction, and a slide shaft 11 fixed to the end of the connecting body 2 is fitted into the hole 10 to attach a Φ ring to the main body 1. The body 4 is mounted so as to be freely slidable and rotatable in the front-rear direction.

Reference numeral 12 denotes a coil spring, which is stretched between the wheel mounting body 4 and the main body 1 so that the front arm 6 comes into contact with the holding shaft 13 fixed to the regulating body 3. _4, which is biased

With this configuration, when not in use, as shown in Fig. 1, the wheel mount 4 is drawn forward by the tension of the spring 12 and the slide shaft 11 is elongated by the slot 10. And the front arm 6 is held in contact with the holding shaft 13 on the wheel mounting body 4 around the slide shaft 11 and the main body 1 is stored upright. You.

In addition, when traveling on level ground, when the main body 1 is raised in the direction a from the state shown in Fig. 1, the slide shaft 11 is loaded with the load of the main body 1 as shown in Fig. 2, and the rear end 10 a), the front arm pivots around the slide shaft 11 so that it contacts the presser shaft 13, the auxiliary wheel 8 rises, and only the main wheel 9 contacts the flat ground A. The main wheels 9 are rotated by hand pushing operation of the main body 1 in the front-rear direction, and the main wheels 1 run smoothly on the flat ground A freely left and right.

Next, the state when ascending the stairs will be described with reference to FIGS. First, when the main body 1 is pulled and moved under the stairs B in the same manner as when traveling on level ground, the sub-wheel 8 hits the stair lavage surface C (see Fig. 3).

Then, when the main body 1 is pulled up in the direction parallel to the inclination angle of the stairs B (the direction of the arrow b), as shown in Fig. 4, the secondary wheel 8 is pressed down by the stairs (surface C), At the same time, the slide shaft 11 moves from the rear end 10a of the slot 10 to the front end 10b, and at the same time, the presser shaft 13 also moves in the same angular direction and separates from the front arm 6.

Subsequently, when the main body 1 is pulled up in the direction of the arrow b, the front and rear arms 6, 7 rotate clockwise c around the slide shaft 11 as shown in FIG. , And at the same time, the secondary wheel 8 rolls up the staircase surface C.

When the secondary wheel 8 rises completely from the stair side C to the top stair D of the first step as shown in Fig. 6, the main wheel 9 rises from the flat ground A below the stairs and contacts the stair side C. As the wheel mounting arm 4 rises while rotating along with it, it rotates counterclockwise (arrow d) about the slide shaft 11.

In addition, as shown in Fig. 7, the secondary wheel 8 rotates on the top surface D of the stairs and the main wheel 9 further rises on the measurement surface C of the stairs, as shown in Fig. 7 due to the lifting of the main body 1. When the main wheel 9 reaches the contact point E with the upper surface D at the upper end of the stairs J surface C, the spring 12 expands against the tension as shown in Fig. 8. , the extension of the spring 1 2 becomes maximum, the repulsive force becomes strongest _Λ

And from the state where the main wheel 9 was obstructed by the stair lavage surface C When released and moved to the top surface D of the stairs, the repulsive force of the spring 12 that has been stretched to the maximum is exerted, and the secondary wheel 8 is flipped upward (arrow e) as shown in FIG. At the same time, the wheel attachment 4 rotates clockwise (arrow f) around the axis 9 a of the main wheel 9, and the rear end 10 a of the long hole 10 is inclined downward, and fitted into this. The slide shaft 11 slides from the front end 10 b of the slot 10 to the rear end 10 a of the slot 10, and the body load applied to the slide shaft 11 moves to the rear outside of the main wheel 9. .

The front arm 6 of the wheel mounting rest 4 rotated by the repulsive force of the spring 12 collides with the pressing shaft 13 of the regulating body 3 and stops, and the state again becomes the same as the state shown in FIG. The ascent to the second staircase is adjusted.

By repeating such operations, it is possible to climb the stairs one after another. When descending the stairs, the above operation is performed in reverse, and the vehicle descends smoothly. Further, even on uneven terrain having irregularities, the vehicle can travel by an operation similar to the above operation. In the above embodiment, the wheel device of the present invention is mounted on a hand car for carrying luggage, but the present invention is not limited to this.

Instead of mounting the wheel devices on both the left and right sides of the main body, a single unit may be provided at the center, or a plurality of rows may be provided in the left and right direction of the main holiday.

FIGS. 10 to 19 show that the wheel device of the present invention is mounted on a hand car for carrying luggage, and that a pair of the wheel devices is mounted on the left and right sides of the hand car main rest so that they can operate independently. This is the second embodiment of the present invention. Reference numeral 1 denotes a main body of a hand car, and a connecting body 2 formed of a substantially triangular plate is connected to both lavages at the rear of the lower surface of the main body 1, and an elastic buffering rest having elasticity is provided on the lower surface of the main body in the connecting body 2. 3 is installed.

Reference numeral 4 denotes a wheel mounting body. A front arm 6 and a rear arm 7 are formed in a V-shape at both ends of a base end portion 5 composed of a horizontal member, and are formed in a V-shape. A small-diameter auxiliary wheel 8 is rotatably mounted on the shaft, and a large-diameter main wheel 9 is rotatably mounted on the tip of the rear arm 7. A long hole 10 is formed in the rear arm 7 in the front-rear direction (vertical direction in FIG. 10) so as to be close to the rear of the main wheel 9, and is fixed to the tip of the connecting body 2. The slide shaft 11 is fitted, and the wheel grip 4 is attached to the main body 1 so as to be freely slidable and rotatable in the front-rear direction.

Reference numeral 12 denotes a coil spring, which is stretched between the wheel mounting body 4 and the main body, whereby the base end portion 5 is urged so as to abut on the buffer regulating body 3.

With this configuration, when not in use, the main body 1 can be set up with the dashed line XX as the ground surface as shown in Fig. 10. At this time, the wheel mounting arm 4 is pulled forward by the tension of the spring 12 and the slide shaft 11 comes into contact with the rear end of the elongated hole 10 and the wheel mounting body is centered on the slide shaft 11. The base end 5 of 4 is held and housed in a state of contact with the buffer regulating body 3.

In addition, when traveling on level ground, when the main body 1 is raised in the direction a in FIG. 10, the slide shaft 11 comes into contact with the rear end 10 a of the elongated hole 10 under the load of the main body 1, and The auxiliary wheel 8 is lifted around the shaft 11 with the base end 5 abutting on the buffer rest 3 and the sub-wheel 8 is lifted up. Only the main wheel 9 is kept in contact with the flat ground A and the full load is applied, and the main wheel 9 rotates left and right by the hand pressing operation of the main body 1 and runs smoothly on the flat ground A.

Next, the state when ascending the stairs will be described with reference to FIG. 12 to FIG.

First, when the main body 1 is pulled and moved under the stairs B in the same manner as when traveling on level ground, the auxiliary wheel 8 hits the stair rising surface C (see Fig. 12).

Then, when the main body 1 is pulled up in the direction parallel to the inclination angle of the stairs B (the direction of the arrow b), the secondary wheel 8 is pressed by the stair climbing surface C as shown in FIG. The slide shaft 11 moves from the rear end 10a of the elongated hole 10 to the front end 1Ob against the tension of Move to and move away from the base capital 5.

Subsequently, when the main body 1 is pulled up in the direction of the arrow, the front and rear arms 6, 7 rotate clockwise c around the slide shaft 11 as shown in Fig. 14, and the main wheel 9 is moved to the stairs B as shown in FIG. At the same time, the secondary wheel 8 rolls up the stair riser C,

When the secondary wheel 8 completely climbs from the stair rising surface C to the first stair tread surface D as shown in Fig. 15, the main wheel 9 rises from the flat ground A under the stairs and rises to the stair rising surface C. The wheel mounting rest 4 rotates in the counterclockwise direction (arrow d) around the slide shaft 11 as it rises while rotating along this while abutting.

Further, as shown in Fig. 16, the auxiliary wheel 8 rotates on the stair tread surface D and the main wheel 9 is further raised by the lifting operation of the main body 1, as shown in Fig. 16. In order to ascend the step rise surface C, the wheel mounting rest 4 further rotates in the counterclockwise direction d, whereby the spring 12 expands against the tension.

Eventually, when the main wheel 9 reaches the contact point E with the tread surface D at the upper end of the stair riser surface C, the extension of the spring 12 becomes the maximum and the repulsion force becomes the strongest as shown in FIG.

Then, when the main wheel 9 is released from the state of being hindered by the stair rise surface C and moves to the stair tread surface D, the repulsive force of the spring 12 that has been maximally extended acts, as shown in FIG. Thus, the auxiliary wheel 8 is flipped upward (arrow e), and the wheel mount 4 rotates clockwise (arrow f) about the axis 9a of the main wheel 9 as shown in FIG. As shown in the figure, the rear end 10a of the long hole 10 is inclined downward, and the sliding shaft 11 fitted into this slides from the front end 10b of the long hole 10 to the rear end 10a. The main body load applied to the slide shaft 11 moves to the outside measurement behind the main wheel 9.

The front arm 6 of the wheel mounting rest 4 rotated by the repulsive force of the spring 12 abuts on the buffer regulation 3 and stops, and the rising rest to the second-step stairs is adjusted.

By repeating the operation in this way, it is possible to climb the stairs one after another. Also, when descending the stairs, the above operation is performed in reverse, and the vehicle descends smoothly. Further, even on uneven terrain having irregularities, the vehicle can travel by an operation similar to the above operation. In the above-described embodiment, the wheel device of the present invention is mounted on a hand car for carrying cargo, but the present invention is not limited to this.

In addition, instead of installing the wheel device on both the left and right sides of the — Ii Multiple rows may be installed at one location or in the horizontal direction of the main unit.

FIGS. 20 to 26 show the wheel device of the present invention mounted on a hand car for carrying luggage, and a pair of Φ wheel devices equipped on the left and right sides of the hand car body so that they can operate independently. This is the third embodiment.

Reference numeral 1 denotes a main body of a hand car, and connecting bodies 2 and 2 are attached to both sides of a rear surface of a lower surface of the main body 1. The connecting body 2 is formed of a 板 -shaped plate, and has a rear end curved in a semicircular shape to have a substantially U-shape having a folding buffering property, thereby forming a folded portion 2a below. Then, the main shaft 23 is stretched over the central portion of the folded portions 2a, 2a of the two connected bodies 2, 2, and fixedly attached thereto. It is pivotally connected to the rotation itself.

The present invention includes the following structures in addition to the above structures.

Numeral 34 denotes wheels, which are fixed so as to bridge the ends of the folded portions 2a, 2a of the two connected bodies 2, 2. Reference numeral 35 denotes a wheel mounting body, which is disposed in front of both sides of the main shaft 23, respectively. Each wheel mounting rest 35 is composed of opposed mounting plates 36, 36. The mounting plate 36 forms a front arm 37 and a rear arm 38 in an arch shape, and forms a front arm 37. The shaft 39 on which the small diameter sub wheels 18 are rotatably connected is fixedly attached, and the shaft 40 on which the small diameter rear sub wheel 19 is rotatably connected is also fixed to the rear arm 38. Reference numeral 14 denotes a long hole, which is bored at the rear end of the base of the arms 37, 38 of the mounting plate 36, and is rotatably and slidably fitted to the axle 34, so that a wheel mounting rest is provided. 3 5 -i 2-attached, 15 is a coil spring, which is inserted into the axle 34, one end 15b of which is fixed to the folded part 2a of the connecting body 2, and the other end 15a is attached to the wheel The mounting plate 36 of the body 35 is slidably engaged with the protruding engaging portion 16, and the wheel mounting body 35 is provided with the hole 14 as a fulcrum, and the torsion elastic force of the coil spring 15 is applied. As a result, the front arm 37 is constantly biased in the direction approaching the main body 1. Reference numeral 17 denotes a regulation element for gentle streets, which prevents the wheel gripping body 35 from directly colliding with the main body 1.

With this configuration, when not in use, the main unit 1 can be set up with the dashed line XX as the ground surface as shown in Fig. 20. At this time, the wheel mounting body 35 is longer due to its own weight. The axle 34 moves downward so that the axle 34 abuts on the front end 14a of L14.

The front arm 37 is lifted up by the tension of 15 so as to come into contact with the buffering regulator 17.

Also, when traveling on level ground, if the main body 1 is raised in the direction a in FIG. 20, the rear end of the main body 1 is separated from the flat ground A, and only the main shaft 24 is grounded, so that the main body 1 can run smoothly.

Next, the state when ascending the stairs will be described with reference to FIGS. 22 to 26. FIG.

First, when the main body 1 is pulled and moved under the stairs B in the same way as when traveling on level ground, the rear sub-wheel 19 hits the stair rising surface C, and the pulling force of the main body 1 in FIG. This causes the wheel mounting body 35 to react against the torsional tension of the coil spring 15 with the axle 34 inserted in the long hole 14 as a fulcrum. Turn clockwise, front secondary wheel 1 8 locks to the tip of the stair tread D.

When the main body 1 is subsequently lifted, the wheel mounting body 35 further pivots counterclockwise as shown in FIG. 23, and the front sub-wheel 18 rotates on the tread tread D and the rear part. The secondary wheel 19 rises while rotating along the stair climbing surface C. As a result, the main shaft 24 rises from the flat ground A below the stairs.

Eventually, the rear secondary wheel 19 rides from the upper end of the stair riser surface C to the tip E of the stair tread surface D, whereby the wheel mounting body 35 further rotates counterclockwise with respect to the main body 1, so that the axle 34 moves to the rear end 14 b of the long hole 14, and the main shaft 23 comes into contact with the front end E of the stair tread surface D as shown in FIG. 24.

Then, when the main wheels 1 and 4 ride on the stair tread D by continuing the lifting operation of the main body 1, the rear auxiliary wheel 19 rises above the stair tread D, so that the coil spring 15 of the coil spring 15 is released. The resilient force causes the front arm 37 to pivot upward in the clockwise direction as shown in FIG. By this rotation, the front arm 37 of the wheel mounting body 35 collides with the shock-absorbing restrictor 17 mounted on the main body 1, and at the same time, the axle 34 moves to the front end 14a of the long hole 14 and the second As shown in Fig. 6, the entire body 1 can be lifted on the stair tread D, and the ascent to the second stair is prepared.

By repeating this operation, also _β can and this ascending stairs one after another, when falling the stairs, not line the operation and reverse operation, a smooth ₄ further irregularities is to drop non In the case of leveling, the vehicle can run with the same operation as above. You.

Next, a wheel device 20 shown in FIG. 27 and FIG. 28 is a fourth embodiment of the present invention. : I used the I-Shion spring 32. That is, a connecting body 22 is attached to the rear portion of the lower surface of the hand force main body 2 1, and a large-diameter main wheel 24 is rotatably connected to the main body 23 by a main shaft 23, and a wheel is attached to the front connecting body 22. The mounting body 26 is rotatably pivoted by the axle 25. In this case, instead of the hole 14 as in the third embodiment, it is pivotally connected so as not to slide. A small diameter front sub-wheel 29 and rear sub-wheel 30 are rotatably mounted on the front arm 27 and the rear arm 28 of the wheel mounting body 26, respectively, and are further attached to the joint body 22. One end of the torsion spring 32 is locked to the locking bracket 31, and the center of the torsion spring 32 is passed through the upper lavage of the axle 25 and the other end is locked to the lower part of the main shaft 23. The front arm 27 of the wheel mounting body 26 is constantly urged in a direction approaching the main rest 21 so as to come into contact with the buffering regulator 33, as shown in FIG. 27.

With this configuration, the vehicle can travel on level ground as in the third embodiment, and when climbing the stairs B, similarly to the operation state of the third embodiment shown in FIGS. 22 to 26. The wheel mounting 26 pivots about the axle 25, and the pivoting is performed against the tension of the torsion spring 32 as shown in FIG. be able to.

The present invention is not limited to the configuration of the above embodiment, and may have the following configuration. (a) It is not limited to hand trucks for carrying luggage, but may be equipped on heavy trucks.

(b) the wheel device may be a plurality of rows parallel in the horizontal direction of one location or body in the center instead of mounted on both left and right ί law body _β

(c) Although the wheel mounting body was mounted by a rotating means with an axle fitted in the long hole, in the case of a comparatively comparative car, by adjusting the tension of the coil spring, it was not necessary to make the long hole. As in the fourth embodiment, the wheels may be pivoted so as to rotate without sliding.

(d) The coil spring is not limited to the torsion winding type, but may be a torsion rewinding type or an elastic body such as a tension panel, a compression panel, or rubber, or a weight rest may be attached. In short, it is sufficient if the front arm of the wheel mount is flipped up smoothly. Industrial applicability

As described above in detail with respect to the first embodiment, the present invention has a structure in which the auxiliary wheel and the main wheel are rotatably mounted on the front and rear arms of the wheel mounting body, respectively, and the main body side is inserted into the long hole provided in the base. The slide shaft moves back and forth in the elongated hole in response to changes in the unevenness of the road surface, the wheel mount rotates, and the load on the main Alternatively, it is automatically converted to cover the main wheel and sub wheel, and on flat ground, the sub wheel floats up, and only the main wheel is in contact with the ground, and runs while rotating.In addition, when climbing up and down stairs and uneven terrain, it runs on steps. Due to the change, both the main wheel and the auxiliary wheel touch the ground and rotate, Even a weak person, such as an elderly person, can operate it smoothly and can run the machine smoothly. In addition, the main wheel is supplemented with a small-diameter auxiliary wheel, which makes it lightweight and compact, and has excellent effects such as extremely convenient handling during storage and running operation. Things.

As described above in detail for the second embodiment, according to the present invention, the auxiliary wheel and the main wheel are rotatably mounted on the front and rear arms of the wheel mounting body, respectively, and the elongated holes formed in the rear of the main wheel are provided. Since the slide shaft on the main unit side is fitted, the slide shaft moves back and forth in the long hole according to the change in the unevenness of the road surface, the wheel mount rotates, and the load on the main unit is reduced. Or, it is automatically converted to cover the secondary wheel or the main wheel and the secondary wheel. On flat terrain, the secondary wheel floats up, and only the main wheel is in contact with the ground, and turns, and stairs, uneven terrain When the vehicle goes up and down, the main wheels and the sub wheels contact the ground and rotate according to the change in travel at the step, and fits into the long holes that are the fulcrum of operation conversion between the main wheels and the sub wheels. Since the slide shaft is located close to the rear of the main wheel, the position of the center of gravity is lowered, Of the operating force is transmitted to the main wheel in without waste smoothly, wobble without it is possible to operate reliably, women and children, can be a force of 鞋 rather than operation also weak persons such as the elderly. In addition, since the auxiliary wheel is attached to the main wheel with a small-diameter auxiliary wheel, it has an excellent effect such as compactness due to the height of the stirrer and extremely convenient handling during storage and running operation. .

As described above in detail with respect to the third and fourth embodiments, the present invention relates to a wheel device in which a main wheel is pivotally connected to a main body via a connecting body, and a wheel mounting in which auxiliary wheels are pivotally connected to front and rear arms, respectively. Allows the body to rotate during a connection break It is equipped with a biasing means that biases the mounting and wheel mounting body toward the main body side, so on flat terrain, it travels freely with the main wheels as with the conventional wheel device, and when climbing up and down stairs or uneven terrain, In response to the change in running at the stepped part, both the secondary wheels are automatically brought into contact with and separated from the stepped part in conjunction with the rotation of the main wheels, the group wheel mounting rest, and the operation of the biasing means, as well as the operation of the main wheels. And it can go up and down smoothly. In addition, women, women, the elderly, and other weak people can operate comfortably without difficulty. Further, the wheel device of the present invention can be manufactured by a simple operation of attaching the wheel mounting body and the urging means without largely modifying the existing structure such as a conventional hand car for traveling on flat ground. It has excellent usability, and has the effect of providing an easy-to-manufacture and inexpensive wheel device.

Claims

ψ WO 90/01441 PCT / JP89 / 00814-18-Section

1. A small diameter sub-wheel is attached to the tip of the front arm and a large-diameter main wheel or small-diameter sub-wheel is attached to the tip of the rear arm.

5 At the same time, connect the wheel mounting body to the

A wheel device for flat terrain, stairs and uneven terrain, characterized by being pivotally mounted.

2. A small diameter secondary wheel is attached to the front arm formed on the wheel mounting body,

A large-diameter main wheel is rotatably mounted on each

Claim 1 characterized in that a long hole is formed in the base of the body in the front-rear direction, and a slide shaft of a connection rest attached to the main body is slidably fitted into the long hole. Wheels for flat terrain and stairs and rough terrain as described in paragraph.

Fifteen

3. A small-diameter sub-wheel is attached to the tip of the front arm and a large-diameter main wheel is attached to the tip of the rear arm so as to be freely rotatable, and the front and rear directions are close to the rear of the main wheel of the rear arm. A long hole is made toward the hole, and the slide shaft of the connector attached to the main body can slide in the long hole.

20 The flat ground according to claim 1

Wheels for stairs and rough terrain.

4. A large-diameter main wheel is rotatably pivoted to the connector attached to the bottom of the main suspension, and the front arm and the rear arm are formed in an arch shape.

25 At the end, small diameter auxiliary wheels are pivotally mounted A first means for rotatably attaching to a connecting body in front of a main wheel, and urging means for constantly urging the front arm so as to be close to the main body lavage is attached to the attaching portion. Φ wheel device for flat terrain and stairs and irregular terrain as described in the item