JPH09188258A - Vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the vehicle which hardly changes the structure of a vehicle itself such as its carriage and the like, is safer as compared with a former one, is excellent in operating performance, and also can travel over either one of the difference in level and a stair case, or over both of them while a plain running condition is still being left over as it is. SOLUTION: A stationary caster 10 is mounted onto the forward end part of the back surface of a base plate 1 in a state that a wheel 9 is somewhat projected out of the forward end of the base plate 1, an universal caster 12 is mounted onto the rear end part of the back surface of the base plate 1, an intermediate wheel 13 is mounted onto the intermediate part of the back surface of the base plate in the longitudinal direction in a state that the wheel is somewhat floated from the ground plane, and a carriage 8 is so constituted that both an angle part 19 where a long side 16 and a short side 17 are formed roughly in an L shape, and a support arm 18 where auxiliary wheels 20 and 21 are rotatably mounted onto the tip ends of the long side 16, are mounted thereto in such a way as to be rotated around the tip end of the short side 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle including a trolley including a human power drive and a power drive, a wheelchair, a baby carriage, a work vehicle of an arbitrary shape, etc., and more particularly to a vehicle capable of running on a step or stairs. Is.

[0002]

2. Description of the Related Art Conventionally, wheels, for example, three to six wheels are mounted on a vehicle body, and a vehicle that travels while keeping the vehicle body substantially constant, for example, substantially horizontal, for example, a bogie that travels by pushing a rear handle. In this case, as in the case of traveling on level ground, even if the button is pressed as it is, the step cannot be climbed.

[0003]

Therefore, in general, with the rear end of the carriage held down by the foot, pull the upper end of the handle toward you and push it while lifting the front part of the carriage to put the front wheel on the step. After pushing the dolly further in this state, push the rear part of the dolly and push it so that the rear wheels should be placed on the step.Especially when the load to be transported is heavy, pull the upper end of the handle toward you. Since the front part of the dolly cannot be lifted, it is not possible to perform all of these operations at the handle position on the rear part of the dolly, and in the end, the operator goes to the front of the dolly or returns to the back and lifts the dolly. There was a drawback that you had to put on the step. Furthermore, a normal trolley cannot climb the stairs as it is. Therefore, in order to allow the trolley to climb the stairs, a caterpillar is attached to the trolley or three wheels with three wheels attached to each tip of the three spokes. Spoke wheels must be installed on both sides of the trolley, which not only makes the trolley heavier but also unwieldy and can fall to the bottom when you let go of the trolley. Since the weight of the baggage is applied to the arm of the worker, it cannot be done unless the worker has a considerably strong force, and it has not become popular. Therefore, an object of the present invention is to
It is an object of the present invention to provide a vehicle that is much safer, has better workability, and can easily climb a step or stairs as compared with the conventional one, even though the structure of the cart itself is relatively simple.

[0004]

That is, according to the present invention, for a vehicle in which the vehicle body is supported by wheels so that the vehicle can travel, the vehicle body is supported in front of a rear wheel position when traveling on a level road when the vehicle travels on a step. A vehicle provided with a vehicle body intermediate position support device at a step capable of traveling in a state where the vehicle body front is lifted with the support position as a fulcrum. Alternatively, the rear wheel position of the vehicle that supports the vehicle body by wheels is set to an intermediate position of the vehicle body that facilitates frontward lifting of the vehicle body, and a vehicle body rear end support device that can be retracted to the vehicle body rear end portion is provided. vehicle. Alternatively, a vehicle having a vehicle body intermediate position support device for supporting a vehicle body at least one step below the stairs at a vehicle body intermediate position when the vehicle travels on the stairs, as opposed to a vehicle that supports the vehicle body with wheels. Or, for a vehicle that supports the vehicle body with wheels, a vehicle body intermediate position support device that supports the vehicle body so that the vehicle body can travel ahead of the rear wheel position when traveling on level ground when the vehicle travels on steps, and when the vehicle travels on stairs. A vehicle provided with a vehicle body intermediate position support device for a staircase that supports the vehicle body at least one step below the stairs at the vehicle body intermediate position. In this case, the front wheel of the vehicle can be projected from the front end of the vehicle body, and in the state where the front wheel of the vehicle is projected from the front end of the vehicle body, the maximum projecting position can be moved back and forth as the return position by the spring biasing force. It is also possible to attach the intermediate wheel to the back-side front-rear direction intermediate portion of the vehicle body in a non-grounded state in which it is slightly floated above the ground contact surface.

[0005]

In the case of a vehicle having such a structure, for example, a bogie, an intermediate wheel is attached to an intermediate portion on the back side in the front-rear direction of a conventional four-wheel bogie in a non-grounded state slightly floated from the grounding surface, and at a step and stairs. As a vehicle body intermediate position support device, a support arm having wheels and long sides and short sides integrally formed into a substantially L-shape is provided at the rear of the vehicle so as to be slightly above the ground contact surface so as not to hinder traveling on level ground. Rui is attached as the rear wheel without floating the wheel on the short side. Therefore, the trolley can be pushed on the handlebar and run on the flat ground regardless of the support arm in the same way as the conventional trolley. If there is a step in the level running state by pushing this handle, first, the front end of the base plate or the protruding front wheel hits the wall of the step to stop the cart. In this state, when the support arm is rotated by placing a foot on the long side of the support arm, the rear part of the trolley has a short side length of the support arm, which is a preset height corresponding to the step running, for example, 30 mm to 50 mm. It is supported in a raised state. In this case, the rotation center position of the support arm is located closer to the center in the longitudinal direction of the bogie than the rear wheel position. Therefore, in this state, when pulling the handle of the dolly down and tilting it down, the dolly uses the center of rotation of the support arm as a fulcrum, or the rear wheel that moves forward from the rear wheel position when traveling on level ground becomes a fulcrum. Then, you can lift the front part at least to the height of the step even if the load on the trolley is heavy, and if you push it as it is, the shape of the step will be changed if the front wheel hits the step wall. If it naturally rides on a step along the front wheel, and the front wheel moves back and forth, the front wheel has already returned to the spring and is on the step, and if you push it further to move the truck forward, the intermediate wheel of the truck next. Hits the step at about its axial center position and pushes the trolley as it is or pulls the handle further forward, the intermediate wheel also naturally rests on the step, and the trolley is supported by the front wheel and the intermediate wheel on the step. You can Never rear of the truck extremely decreases in state. As a result, when the support arm is pressed as it is, the support arm hits the step and returns to the spring, and at the same time, the entire carriage moves on the step in the state of traveling on level ground. Next, in the case of stairs, with the front part of the dolly placed on the first step of the stairs by the above operation, the dolly is further advanced and the front part of the dolly is in contact with the second step wall of the stairs, and the handle is turned up. When lifted, by the urging force of the toggle spring, or when pushing the support arm with the foot while lifting the handle, the rear part of the trolley is a long side of the support arm, which is a preset height corresponding to stairs traveling, for example, The height of one step of the stairs is lifted by about 210 mm to 230 mm with respect to the height of 180 mm, and the carriage is stably supported in a substantially horizontal posture in which the carriage is tilted slightly forward on the first step of the stairs so as not to hinder the transportation of luggage. In this state, when the handle is pulled toward you, the trolley is supported by the long side of the support arm and the front wheels are located on the second step of the stairs. Therefore, when the handle is lifted and pushed in this state, The long side of the support arm is 1 from the bottom of the stairs
When the vehicle is placed on the step and the handle is pulled further toward you in this state, the front wheel of the truck is located on the third step of the stairs, and the truck can easily climb the stairs by repeating the above operation. . The trolley can move down the stairs in the reverse operation of the ascending operation, and the same actions and effects as described above can be obtained even if the trolley is an arbitrary vehicle such as a wheelchair, a baby carriage, or a work vehicle.

[0006]

Next, the structure of a first embodiment of the present invention will be described with reference to FIGS. Vehicles including manual and power drives, vehicles such as baby carriages and wheelchairs, in this case, foldable by rotating on a platform bracket 2 on a platform 1 about an axis 3, and
A base plate 1 of a dolly 8 on which a gate-shaped handle 7 is attached so as to maintain a vertical posture of being raised by a lock bar 6 which can be moved up and down by the resting force of a stopper 4 and a spring 5 and stepping on a wheel 9 at a front end portion thereof. 1 A fixed caster 10 is attached in a state of slightly protruding from the front end by, for example, 20 mm, and a free caster 12 that rotatably supports wheels 11 is attached to the rear end of the back surface of the base plate 1, and the front and rear surfaces of the back surface of the base plate 1 are attached. An intermediate wheel 13 is rotatably attached to an intermediate portion in the direction via an intermediate bracket 14 and a shaft 15 while being slightly floated from a ground contact surface formed by the front and rear wheels 9 and 11. On the other hand, at the rear end of the back surface of the base plate 1, a support arm 18 having a long side 16 and a short side 17 formed in a substantially L shape,
A support arm 18 having auxiliary wheels 20 and 21 rotatably attached to the corner portion 19 and the tip of the long side 16 is rotatably mounted around the tip of the short side 17 of the rear bracket 22 and the shaft 2.
The support arm 18 is mounted via the support arm 18, and the rear portion of the bogie 7 travels on the short side 17 of the support arm 18 at a step due to the constant rotation of the corner auxiliary wheel 20 changing from the non-grounded state to the grounded state. Correspondingly, it is mounted so as to be supported in a state where it is lifted up to a preset height, for example, about 30 mm to 50 mm, and the support arm 18 is further rotated to support the rear side of the carriage 7 by the long side 16 of the support arm 18, thereby supporting the carriage. The rear part of 7 has a preset height corresponding to stairs traveling, for example, 210 mm for a height of 180 mm for one staircase.
It can be lifted by about mm to 230 mm. A reinforcing stay 25 is attached between the long side 16 of the support arm 18 and the rotation center shaft 23 of the support arm 18 via a shaft 24, and the shaft 24 and the rear bracket 2 at the left and right positions of the base plate 1 are attached.
Between the shaft 26 attached between the two shafts 23, 2,
A toggle ring 27 having a line connecting the straight lines 4 and 26 as a dead line is attached, and a foot bar 28 is not necessarily required between the left and right long sides 17 of the support arm 18, but a gate-shaped operation for operation. A bar 29 is attached, and further, a handle 30 for lifting the truck 8 is attached via a shaft 26 to an intermediate portion of the back surface of the base plate 1.

Next, the operation of this embodiment will be described with reference to FIGS. In the case of the bogie configured in this way, the intermediate wheel 13 is attached to the back-side front-rear direction middle part of the conventional four-wheeled car in a non-grounded state slightly floating from the grounding surface, and the rear part of the base plate 1 is provided with a complementary rib. A support arm 18 in which the long side 16 with wheels 20 and 21 and the short side 17 are integrally formed in a substantially L-shape is mounted so as to be slightly floated above the ground contact surface so as not to hinder traveling on level ground. The dolly 8 can be pushed on the handle 7 and run on the flat ground regardless of the support arm 18 in the same manner as the conventional dolly. When the handle 7 is pushed, the step 31
If there is, first, the front wheel 9 that protrudes from the wall 3 of the step 31
Upon hitting 2, the carriage 8 stops as shown in FIG. In this stopped state, when the foot is put on the foot bar 28 of the support arm 18 to rotate the support arm 18 against the urging force of the toggle spring 27, the rear portion of the carriage 8 is moved to the support arm 18 as shown in FIG. The short side 17 is supported in a state where it is lifted up to a predetermined height corresponding to the step 31 running, for example, about 30 mm to 50 mm. In this case, the rotation center position of the support arm 18 is located closer to the center in the front-rear direction of the carriage 8 than the mounting position of the universal caster 12.
Therefore, in this state, as shown in FIG. 5, when the handle 7 of the carriage 8 is pulled toward the front and tilted, the rotation center of the support arm 18 of the carriage 8 serves as the fulcrum of the boom and the front portion of the carriage 8 is at least the step 31. Up to the height, even if the load on the dolly 8 is heavy, it can be lifted relatively lightly, and when pushed as it is, the front wheel 9 hits the wall 32 of the step 31 as shown in FIG. 8 naturally rests on the step 31 along the shape of the step 31, and when further pushed and moved forward, as shown in FIG. 7 to FIG. 9, when the intermediate wheel 13 hits the step 31, the handle 7 is further in front. When the dolly 8 is pushed while being pulled, the intermediate wheel 13 naturally rests on the step 31, and when it is pushed as it is, the support arm 18 hits the step 31 and the spring returns, and the dolly 8 as a whole runs on the step 31. above Row. Next, in the case of the stairs 33, the front part of the carriage 8 is moved to the stairs 3 as shown in FIG.
As shown in FIG. 11, the dolly 8 is mounted on the first stage of No. 3
Is further advanced to lift the handle 7 upward while the front part of the carriage 8 is in contact with the wall 34 of the second step of the stairs, the support arm 18 is lifted by the biasing force of the toggle spring 27 or while lifting the handle 7. When pushed in, the rear part of the carriage 8 is moved to the stairs 3 by the long side 16 of the support arm 18.
A preset height corresponding to three runs, for example stairs 33
210 mm to 230 m for a height of 180 mm per step
The carriage 8 is lifted by about m, and is stably supported in a substantially horizontal posture in which the carriage 8 is tilted slightly forward on the first stage of the stairs 33 to the extent that it does not hinder the transportation of luggage. In this state, as shown in FIG. 12, when the handle 7 is pulled toward the front and the rear part of the dolly 8 is pushed down, the dolly 8 is supported by the long side 16 of the support arm 18, and the front wheel 9 is located on the stair 33. Therefore, when the handle 7 is pushed up while pushing the handle 7 in this state as shown in FIG. 13, the long side 16 of the support arm 18 becomes stairs 33.
The trolley 8 is mounted on the first stage of the above and is held substantially horizontally on the second stage of the stairs 33, and the trolley 8 can easily climb up the stairs 33 by repeating the above operation.
Here, even if the carriage 8 is an arbitrary vehicle such as a wheelchair, a baby carriage, or a work vehicle, it is possible to obtain the same operation / effect as the above. If no load is placed on the dolly 8 or if the load is light on the dolly 8, as shown in FIG. 14, the operator puts his / her foot on the rear end of the dolly 8 and tilts the handle 7 forward. It is also possible to drive the dolly 8 to travel on the step 31. When the ground contact surface is inclined, such as on a slope, the support arm 18 is rotated with the front and rear direction of the carriage 8 perpendicular to the inclination direction of the ground contact surface, and the rear portion of the carriage 8 is supported by the support arm 18. By supporting the short side 17, it is possible to prevent the carriage 8 from moving due to its own weight. Further, in this embodiment, since the support arm 18 is inside and the free caster 12 is outside, even if the free caster 12 is provided with a brake, the operator can easily operate the brake in a standing posture. In addition, if the width of the support arm 18 is widened with the free caster 12 inside, the traveling posture of the step 31 and the traveling posture of the stairs 33 of the carriage 8 by the supporting arm 18 can be further stabilized. In the case where the rear wheels of the conventional four-wheeled trolley are used as the casters, even if the auxiliary wheels 20 of this embodiment are fixedly attached after the universal casters while slightly floating from the grounding surface, the step difference 3 caused by the trolley is generated.
It is possible to make one run considerably easier. Next, FIG. 15 shows a second embodiment of the present invention. In this case, the fixed caster 10 of the first embodiment is provided with a wheel arm 37 centered on a shaft 36 against the biasing force of the spring 35. Rotation of the front wheel 38 allows the front wheel 38 to swing for the distance S, so that when the front wheel 38 is located on the step 31 and the stairs 33, the front wheel 38 is placed on the step 31 and the stairs 33. In addition to making the traveling of the step 31 and the traveling of the stairs 33 by the carriage 39 easier, the configuration, action, and effect are the same as those of the first embodiment.
This is almost the same as the case of the embodiment. Next, FIG. 16 and FIG.
Is a third embodiment of the present invention, and in this case, the fixed caster 10, the free caster 12, and the intermediate wheel 1 of the first embodiment.
The intermediate bracket 14 and the rear bracket 22 for mounting the support arm 18 of No. 3 are attached as adapters to the conventional trolley 40 via the auxiliary frame 41 attached to the caster mounting screw holes of the conventional trolley 40 via bolts not shown. And, except that a new carriage 42 is used, the structure, operation and effect are almost the same as in the case of the first embodiment.
In the first and third embodiments, even if the front wheel 9 is inside the base plate 1, the effect is slightly reduced, but
The effect of the present invention can be obtained, and the support arm 18 can be driven by a foot, or can be externally driven by a hand or a motor through any means. For example, the auxiliary wheel 20 may be removed and the step traveling function may be eliminated to provide only the stair traveling function, and the auxiliary wheel 20 may be attached to a large bag for overseas travel, a baby carriage, a wheelchair, or the like.

Next, FIGS. 18 and 19 show a fourth embodiment of the present invention. In this case, a rubber is left inside the main frame 43 formed by a square pipe, leaving a space 45 to be a handle 44. The seat-attached upper plate 46 is attached to form the base plate 47, the free casters 48 are attached to the front portion of the base plate 47, and the wheels 49 protruding forward in the non-grounded state are resisted against the urging force of the spring 50 to the rear. A wheel 53 of a support arm 52 that is swingably mounted on the base plate 47 and that can be returned by a spring 51 is a wheel of a fixed caster, and a lock / unlock lever 5 that rotates around a shaft 54 behind the base plate 47.
5, the lock bar 58 attached to the support arm 52 engages with the lock / unlock lever 55 when the support arm 52 is in the stairs running posture, and the lock / unlock lever 55 is engaged. The configuration, action, and effect are almost the same as those in the above-described respective embodiments except that the lock is released when the lock lever 55 is rotated against the urging force of the spring 57 and the support arm 52 is returned. . Also in this case, the width of the stairs is 210 mm ~
It corresponds to a height of 300 mm and a staircase height of 180 mm to 200 mm.

Next, FIGS. 20 to 27 show a fifth embodiment of the present invention, in which wheels 60 are mounted in a line on the long side portion of the support arm 59, or as a track shown in FIG. The caster 61 is attached and the fixed caster 62 is attached.
Or, a fixed caster 63 capable of swinging shown in FIG.
On the back surface of the dolly 65 to which the free casters 64 are attached, check valves 70 and 71 by a handle 68 at the hand of the air circuits 66 and 67 shown in FIGS.
By switching or by the action of the auxiliary air cylinder 74 capable of sliding the piston 72 against the urging force of the spring 73, the caterpillar bar 75 having the wheels 60 arranged in a row or with a belt is shown in a solid line in FIG. A main air cylinder 78 for performing a quick operation by the spring 76 from the state to the two-dot chain line state and a soft landing operation by the own weight of the carriage 65 and the throttle valve 77 from the two-dot chain line state to the solid line state is attached. As a result, in addition to the step running by the support arm 59 and the stair running one step at a time (see FIG. 20), FIG. 20, FIG. 22, and FIG.
The long side of the support arm 59 and the track bar 7
With 5 you can run continuously on the stairs. Note that FIG.
4, reference numeral 79 in the air circuits 66 and 67 shown in FIG. 25 denotes an air filter. Next, in the above case, as shown in FIG. 27, a plate 80 can be laid on the stairs to prevent stairs from being painful. In this case, the support arm 59 and the caterpillar bar 75 have wheels attached to both ends. Can only be 28 and 29 show the sixth embodiment of the present invention. In this case, the caterpillar bar 75 of the fifth embodiment is used as the support bar 82 with wheels 81, and the stairs going up and down of the carriage 83 are made semi-continuous. Other than that, composition, action,
The effects are almost the same as those of the above-described respective embodiments including the fifth embodiment.

Next, FIGS. 30 to 34 show a seventh embodiment of the present invention. In this case, a fixed caster 85 at the rear portion of the truck 84 can swing back and forth around a shaft 86 and a toggle spring. Fixed caster 85 that can be positioned by 87
And the swing arm 88 of the fixed caster 85.
And support bar 9 with wheels 89 for going up and down stairs
The structure, action, and effect are almost the same as those in the above-described respective embodiments except that the position 0 is attached by the toggle spring 91 and the stopper 92 so as to be positioned. Next, FIGS. 35 and 36 show an eighth embodiment of the present invention. In this case, the fixed caster 94 of the carriage 93 is moved forward along the elongated hole 95 against the biasing force of the spring 96. Other than that, the composition, function,
The effect is almost the same as that of each of the above-mentioned embodiments. Next, FIG.
FIG. 7 and FIG. 38 show a ninth embodiment of the present invention. In this case, the fixed caster 98 of the carriage 97 can be moved forward along the axial direction of the pipe 99 against the urging force of the subling 100. Except for the above, the configuration, operation, and effect are almost the same as those in the above-described embodiments. Next, FIGS. 39 and 40 show a tenth embodiment of the present invention. In this case, the position of the rear wheel 102 of the carriage 101 is set to an intermediate position of the carriage 101 for facilitating the front lifting of the carriage 101, and A rear end support device for the vehicle body that can be retracted to the rear end of the truck 101, in this case, the spring 1.
Pedal 105 with wheel 104 against urging force of 03
When the wheel 104 is stepped on, the lock arm 106 is engaged with the lock bar 108 by the urging force of the spring 107 when the wheel 104 is almost grounded, and is positioned and fixed from the solid line state of withdrawal shown in FIG. 39 to the two-dot chain line state. 39. When the lock arm 106 is stepped on with the lock arm 106, the pedal 104 with the wheel 104 returns from the two-dot chain line state in FIG. Both are almost the same as the above-mentioned respective embodiments. In addition, pedal 105 with wheel 104
To swing like the support arm 18 of the first embodiment so that the rear wheel 102 is brought into a non-grounded state when the pedal 105 is stepped on, and the trolley 101 is run with the grounded wheel 104 as the rear wheel. You can also It is needless to say that the individual devices of the respective embodiments of the present invention thus formed can be individually applied to a vehicle such as a conventional truck to obtain respective effects. Further, a vehicle body intermediate position support device at a step for supporting a vehicle body such that the vehicle body can travel by a wheel so that the vehicle body can travel ahead of a rear wheel position when traveling on a level surface when the vehicle travels at a step, and a vehicle. The vehicle body intermediate position support device for supporting the vehicle body at least one step below the stairs at the vehicle body intermediate position when traveling on the stairs is not limited to each embodiment integrally formed like a support arm and the like, but is also individually independent. Alternatively, it may be replaced by any type of lifting device having a moving device such as wheels at the lower end such as a rod-shaped, pantograph-shaped, or the like. By using a lift device of any type that does not have a moving device, etc., and by making it possible to slide back and forth between the lift device and the car body,
You can also go up and down the stairs horizontally. Even in a lift device of any type equipped with a moving device such as wheels, the same effect as the above can be obtained by sliding the lift device and the vehicle body back and forth.

[0011]

As a result, according to the present invention, the structure of the vehicle itself such as a trolley is hardly changed, and it is much safer than the conventional one, and the workability is good. There is an effect that both can easily travel.

[Brief description of the drawings]

FIG. 1 is a side view of a dolly 8 according to a first embodiment of the present invention, and in this case, a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a plan view of the dolly 8 according to the present embodiment with the handle 7 removed.

FIG. 3 is an operation explanatory diagram of the present embodiment.

FIG. 4 is an operation explanatory diagram of the present embodiment.

FIG. 5 is an operation explanatory diagram of the present embodiment.

FIG. 6 is an operation explanatory diagram of the present embodiment.

FIG. 7 is an operation explanatory diagram of the present embodiment.

FIG. 8 is an operation explanatory diagram of the present embodiment.

FIG. 9 is an operation explanatory diagram of the present embodiment.

FIG. 10 is an operation explanatory diagram of the present embodiment.

FIG. 11 is an operation explanatory diagram of the present embodiment.

FIG. 12 is an operation explanatory diagram of the present embodiment.

FIG. 13 is an operation explanatory diagram of the present embodiment.

FIG. 14 is an operation explanatory diagram of the present embodiment.

FIG. 15 is an explanatory diagram of a second embodiment of the present invention.

16 is a side view of the truck 42 according to the third embodiment of the present invention, and in this case, is a sectional view taken along the line BB of FIG.

FIG. 17 is a plan view of the trolley of the present embodiment with the handle relation removed.

FIG. 18 is a side view of the fourth embodiment of the present invention, which is a partial sectional view taken along the line AA of FIG. 2.

FIG. 19 is a plan view of this embodiment.

FIG. 20 is a side view of the fifth embodiment of the present invention.

FIG. 21 is a plan view of this embodiment.

FIG. 22 is an operation explanatory diagram of the present embodiment.

FIG. 23 is a partially modified view of the present embodiment.

FIG. 24 is an air circuit diagram of the present embodiment.

FIG. 25 is a partially modified air circuit diagram of the present embodiment.

FIG. 26 is a partially modified view of the long side of the support arm 59 shown in this embodiment.

FIG. 27 is an operation explanatory diagram of the present embodiment.

FIG. 28 is a side view of the sixth embodiment of the present invention.

FIG. 29 is a plan view of the present example.

FIG. 30 is a side view of the seventh embodiment of the present invention.

FIG. 31 is a plan view of this embodiment.

FIG. 32 is an explanatory diagram of an operation at the beginning of step climbing according to the present embodiment.

FIG. 33 is an explanatory diagram of the operation at the end of step climbing according to the present embodiment.

FIG. 34 is an explanatory diagram of stair climbing operation according to the present embodiment.

FIG. 35 is a side view of the eighth embodiment of the present invention.

FIG. 36 is a plan view of this embodiment.

FIG. 37 is a side view of the ninth embodiment of the present invention.

FIG. 38 is a plan view of this embodiment.

FIG. 39 is a side view of the tenth embodiment of the present invention.

FIG. 40 is a plan view of this embodiment.

[Explanation of symbols]

 1 base plate 2 upper bracket 3 axis 4 stopper 5 spring 6 lock bar 7 handle 8 dolly 10 fixed caster 12 universal caster 13 intermediate wheel 16 long side 17 short side 18 support arm 19 corner 20 auxiliary wheel 21 auxiliary wheel 27 toggle spring 28 Foot bar 35 Spring 36 Axle 37 Wheel arm 38 Wheel 39 Truck 52 Support arm 53 Wheel 55 Lock / Unlock lever 59 Support arm 75 Caterpillar bar 81 Wheel 82 Support bar 83 Truck 84 Truck 85 Fixed caster 88 Swing arm 89 Wheel 90 Support bar 93 Truck 94 Fixed caster 95 Long hole 97 Truck 98 Fixed caster 101 Truck 102 Rear wheel 104 Wheel 105 Pedal 106 Lock arm

Claims (7)

[Claims] 1. A vehicle having a vehicle body movably supported by wheels, the vehicle body being supported in front of a rear wheel position when traveling on a level when the vehicle travels on a step, and the front portion of the vehicle body is lifted with this supporting position as a fulcrum. A vehicle including a vehicle body intermediate position support device at a step capable of traveling in a state where the vehicle body is lifted forward. 2. A vehicle body rear end support device in which a vehicle rear wheel position for supporting a vehicle body by wheels is an intermediate position of the vehicle body for facilitating frontward lifting of the vehicle body and is retractable to a vehicle body rear end portion. A vehicle comprising: 3. A vehicle body intermediate position support device for a vehicle supporting a vehicle body with wheels so that the vehicle body intermediate position support device supports the vehicle body at least one step below the stairs at the vehicle body intermediate position when the vehicle travels on the stairs. Vehicle characterized by. 4. A vehicle body intermediate position support device for supporting a vehicle body such that the vehicle body can be traveled by wheels so that the vehicle body can travel forward of a rear wheel position when traveling on a level when the vehicle travels on a step, and a vehicle intermediate position support device. A vehicle provided with a vehicle body intermediate position support device for a staircase that supports a vehicle body at least one step below the stairs at a vehicle body intermediate position when traveling on stairs. 5. The vehicle according to claim 1, wherein a front wheel of the vehicle projects from a front end of the vehicle body. 6. The vehicle according to claim 1, wherein the front wheel of the vehicle can be moved back and forth with the maximum protruding position being the return position by the spring biasing force in a state of protruding from the front end of the vehicle body. Alternatively, the vehicle according to claim 4. 7. An intermediate wheel attached to a middle portion in the front-rear direction on the rear side of the vehicle body in a non-ground state slightly raised from a ground surface. The vehicle according to claim 5 or 6.