JP2007007168A - Wheelchair or wheelbarrow - Google Patents

Abstract

As a wheelchair suitable for a user, the user can easily get over a step by himself.
The load (load) applied to the caster 5 changes at the position of the front wheel caster 5, and the running stability of the user and the degree of overcoming the step are affected by the load. For this reason, according to a user's physique, dexterity, etc., the caster 5 is set to an optimal position so that it can be adjusted back and forth. The adjustable structure is such that the supporting frame 1a of the caster 5 is provided horizontally in the front and rear, and the caster 5 can be fixed by a fastening clip or the like at an arbitrary moving position of the frame, or the frame 1 has a double-pipe structure, and both tubes The position of the caster 5 is adjusted and fixed by adjusting the degree of expansion and contraction of the two pipes and fixing both pipes by bolting. By providing the guide 7 and abutting the guide 7 on the step, an upward moving force is applied to make it easier for the caster 5 to rotate in the direction of overcoming the step and to easily get over the step.
[Selection] Figure 1

Description

  The present invention relates to a wheelchair or a handcart that can travel safely without stopping road surface barriers such as road surface irregularities, steps, lateral slopes, and slopes.

When the wheelchair A is described with reference to FIG. 1, a seating portion 2 and a backrest portion 3 are provided between the left and right frames 1, 1, and left and right main wheels 4 are provided outside the frames 1, 1. In general, a front wheel caster 5 is provided at the lower part of the frame 1 and 1 in front of the main wheel 4 (see Patent Documents 1 and 2).
JP 2001-286509 A Japanese Patent Laid-Open No. 2002-126010

  Today, barrier-free is screamed, but in reality, there are very few barrier-free places, so for those who use the wheelchair A without a caregiver, the step on the running surface (moving surface) is very high. It is troublesome. In order to get over the level difference, the user (passenger) deposits weight on the main wheel 4 to reduce the installation load of the front wheel caster 5 or lift the front wheel caster 5 so that the front wheel caster 5 steps over the level difference. The main wheel 4 is advanced so that it can be easily exceeded and the level difference is overcome.

However, in order to lift the front wheel caster 5 and overcome the step, not only skill is required, but also high skill (technique) is required, so it is very difficult for ordinary users to operate it. It is. For this reason, when the wheelchair A is used, if it collides with a step, the reaction force (impact force) direction usually passes below the center of gravity of the wheelchair. In some cases, it will fall to the front side, which is very dangerous.
In particular, in the wheelchair A, the smaller the distance between the wheel shafts of the main wheel 4 and the front wheel caster 5 is, the better the small turning ability is. Yes. For this reason, the center of gravity of the wheelchair A is on the front side, and there is a high risk of the forward rotation.

  As described above, various techniques for facilitating the climbing have been proposed in consideration of the difficulty of traveling over the steps of the wheelchair A and the possibility of forward rotation. For example, as shown in Patent Document 1, a swingable auxiliary wheel is provided at the front portion of a frame, and in order to get over a stepped portion, the auxiliary wheel is pressed against a running surface to float the front wheel caster 5. Further, as disclosed in Patent Document 2 and the like, there is a frame that can be lifted over a frame 1 or 1 by a link mechanism or the like.

  In addition, there is a front wheel caster provided with a suspension function, which makes it easy to move up and down steps and travel on rough roads.

Although the conventional technology for overcoming a level difference is effective as it is, the wheelchair A having the technology is expensive and has poor operability.
Also, the step over operation varies depending on the user's physique, dexterity, exercise ability, etc. In contrast, the general wheelchair A is a standard product as a standard product.
In the case of using a suspension, the riding posture changes drastically due to its shock-absorbing property, and depending on the user, the raising / lowering operation becomes difficult or dangerous.

  Furthermore, although it can be said that there is no level difference, when the wheelchair A is used to travel on a highly uneven road surface, if the front wheel caster 5 fits into the unevenness, the conventional caster 5 can freely change the traveling direction (the axis perpendicular to the axis of the wheel). Since the direction of the wheelchair A and the direction of the wheel of the caster 5 do not coincide with each other, the caster 5 often cannot get over the unevenness smoothly. There is also a risk of falling.

  In addition, considering the drainage, the road surface is usually inclined downward (hereinafter referred to as “lateral slope road”) toward the road with the drainage groove. When traveling at A, the force in the gradient direction acts on the wheel of the front wheel caster 5, and the wheel is directed in the gradient direction. If this wheel is directed in the direction of the gradient, the direction of the wheel is often different from the traveling direction, and the front wheel casters 5 are shaken and smooth traveling cannot be performed. Further, the shaking of the front wheel casters 5 occurs also when traveling on a slope.

  The above is the case of the wheelchair A, but the push cart B in which the casters 25 are provided before and after the mounting table 23 shown in FIG.

  The first object of the present invention is to enable a user to easily get over a step and to stably travel on an uneven road surface. The second problem is to stabilize the traveling on a side slope road or a slope. And

In order to solve the first problem, one means of the present invention enables the position of the front wheel caster to be adjusted back and forth.
The load (load) applied to the front wheel caster changes at the position of the front wheel caster, and the traveling stability of the user and the degree of overcoming the step are affected by the load. For this reason, in a wheelchair, according to a user's physique, dexterity, etc., it sets to the optimal front-wheel caster position. In normal traveling, the front wheel casters are moved forward and fixed forward on road surfaces with many irregularities such as steps, etc., in order to obtain a small turning ability, between the wheel axles as in the past. Furthermore, the front wheel casters can be fixed (support shafts in the direction perpendicular to the axis of the wheel are fixed) on lateral slopes, slopes, and the like. In this case, the support shaft of the front wheel caster can be rotated and fixed.

  Specifically, in a wheelchair in which a seating portion and a backrest portion are provided between the left and right frames, left and right main wheels are provided outside the frame, and a front wheel caster is provided at the lower portion of the frame in front of the main wheels. The front wheel caster is configured such that its mounting position can be adjusted in the front-rear direction and can be fixed at its moving position.

  As the adjustable structure, various known modes are conceivable. For example, a support frame for a front wheel caster is provided horizontally in the front and rear, and can be fixed at an arbitrary position of the frame by a fastening clip or the like. It is possible to consider a mode in which the position of the front wheel caster is adjusted and fixed by adjusting the degree of expansion and contraction of both pipes by fixing the both pipes by bolting or the like.

Another means of the present invention for solving the first problem is that an auxiliary wheel is provided in front of the front wheel caster and capable of moving upward from the ground contact position.
With this auxiliary wheel, the wheelchair becomes a six-wheeled wheelchair, and while traveling is stable, the auxiliary wheel will first collide with the step when it gets over the step, which is the same as when the front wheel caster is positioned forward. As a result, the ride is smoother and less likely to bend forward. Compared to the case of using a front wheel caster, this overriding operation is smooth (smoothly overcoming) because the load applied to the auxiliary wheel is small.
Also, considering that 6 wheels can support a wheelchair with 4 wheels, even if one wheel is located in a recess, it is unlikely to fit in the recess, so that it can run stably on uneven roads. Can do.
This auxiliary wheel may be one in which a support shaft in a direction perpendicular to the axis of the wheel is capable of rotating, one fixed in reverse, or one that can be selected to be rotatable or fixable.

  In these wheelchair configurations, a guide projecting forward from the front wheel caster or auxiliary wheel is attached to the frame, and the front surface of the guide is a tapered surface inclined upward, and the height of the tapered surface. The height of the center of rotation of the front wheel caster or auxiliary wheel is located inside, and the front portion below the center of rotation of the front wheel caster or auxiliary wheel may protrude from the plane including the tapered surface.

  When the guide is provided in this way, the wheelchair faces the step, and when the upper edge of the step comes into contact with the tapered surface of the guide, the guide pushes the step due to the forward inertial force that the wheelchair has traveled so far. Since the front surface of the guide is a tapered surface that is inclined upward, the reaction force that pushes the guide upward from the upper edge of the step works against the pressing force, so that the guide, that is, the front wheel caster or auxiliary wheel Lift up.

  At this time, in order for the front wheel caster or auxiliary wheel to easily get over the step, the upper edge of the step and the position where the front wheel caster or auxiliary wheel hits are preferably below the center of the caster, and the height of the tapered surface of the guide Since the front center of the front wheel caster or auxiliary wheel is located inside and the front portion below the center of the front wheel caster or auxiliary wheel protrudes from the plane including the tapered surface, the front wheel is moved upward. The caster or auxiliary wheel also rises and eventually touches the upper edge of the step. The contacted state is below the center of rotation of the front wheel caster or auxiliary wheel, and the front wheel caster or auxiliary wheel is easy to rotate in the direction of overcoming the step, and it is easy to get over. For this reason, the possibility that the steps of the wheelchair can be easily overcome increases.

  In the state where the front portion below the rotation center of the front wheel caster or auxiliary wheel protrudes from the plane including the tapered surface, the state where the outer peripheral surface of the front portion below the rotation center of the front wheel caster or auxiliary wheel is in contact with the plane is also included. Including. This guide can also be used for a wheelchair in which the front wheel caster or auxiliary wheel mounting position is not adjustable in the front-rear direction. In addition, the guide can easily pass through unevenness on rough roads and can also move away obstacles. For this reason, for example, it becomes a wheelchair effective also for the leg injury victim who was damaged by the earthquake in Cambodia etc.

In order to solve the above second problem, the present invention makes the front wheel a fixed type that cannot change direction.
The front wheel sways during travel because the front wheel has a support shaft in a direction perpendicular to the axis of the wheel so that the direction can be changed easily. Disappear. For this reason, when traveling on uneven roads, side slope roads, slopes and the like, smooth running is possible by eliminating the shaking.
Making the front wheel a fixed type that cannot change direction can be adopted for the wheelchairs having the above-described configurations as described above.

  Each of the above means can also be adopted in a hand cart, and exhibits the same action. Specifically, in a handcart with casters provided before and after the mounting table, the front caster adopts a configuration in which the mounting position thereof is movable in the front-rear direction.

  In this configuration, a guide projecting forward from the front caster is attached to the frame of the front caster, and the front surface of the guide is inclined upward toward the front to form a tapered surface, and the front side is within the height of the tapered surface. The rotation center height of the caster is located, and the front portion below the rotation center of the front caster protrudes from the plane including the tapered surface.

Moreover, in the handcart provided with casters before and after the mounting table, an auxiliary wheel that can select the grounding position and the non-grounding position above it can be provided in front of the front caster.
In this configuration, similarly, a guide projecting forward from the auxiliary wheel is attached to the frame of the auxiliary wheel, and the front surface of the guide is a tapered surface that is inclined upward and has a height of the tapered surface. The height of the rotation center of the auxiliary wheel is positioned inside, and a front portion below the rotation center of the auxiliary wheel protrudes from a plane including the tapered surface.

  Further, similarly, the front casters or the auxiliary wheels can be fixed so as not to change direction.

As described above, since the position of the front wheel caster (front caster) can be adjusted back and forth as described above, the optimal front wheel caster position can be set according to the physique, dexterity, etc. of the user. It becomes easy to use.
Further, since an auxiliary wheel that can be moved upward from the ground contact position is provided in front of the front wheel caster (front caster), it is possible to easily get over the step and to travel on uneven roads.
Furthermore, by providing a guide, the step can be easily overcome.
By the way, if the forward position of the front wheel casters and the presence of auxiliary wheels eliminate the forward bending or forward rotation at the time of a collision with a step, etc., even if the step cannot be overcome, it is possible to re-challenge the movement operation. , It is possible to give the user an awareness of “safe even if it fails”.

  1 to 3 show an embodiment of a wheelchair. The basic structure of this embodiment is the same as a conventional standard product, and a seating portion 2 and a backrest portion 3 are provided between the left and right frames 1 and 1. The left and right main wheels 4 are provided on the outer side between the frames 1 and 1, and the front wheel casters 5 are provided below the frames 1 and 1 in front of the main wheels 4.

  The left and right front wheel casters 5 are respectively attached to support rods 1 a extending in front of the lower part of the frame 1 by fastening brackets (clips) 6. The fastening bracket 6 is fixed to the support rod 1a by dividing the upper portion into two parts and tightening the bolt 6a through the support rod 1a therebetween (see FIG. 3). For this reason, the front wheel caster 5 is moved to an arbitrary position of the support rod 1a, and the fastening bracket 6a is tightened at that position, whereby the front wheel caster 5 is fixed at the arbitrary position. That is, the front wheel caster 5 can move in the front-rear direction and can be fixed at the moving position.

  A guide 7 is provided on the side of the support shaft (above the rotating portion) of both front wheel casters 5, and the front surface 7a of the guide 7 is formed as a tapered surface that is inclined upward. Whether the rotation center c of the front wheel caster 5 is located within the height h of the tapered surface 7a, and whether the outer peripheral surface of the front portion below the rotation center c of the front wheel caster 5 is in contact with the plane including the tapered surface 7a. It is in a protruding state (see FIGS. 2 and 3). The guide 7 is preferably made of a material that is resistant to impacts, and the tapered surface 7a is preferably slippery.

  Since the guide 7 is on the side of the front wheel caster 5, it does not interfere with rotation (in the direction of the arrow in FIG. 2) around the support shaft of the caster 5 (support shaft in the direction perpendicular to the axis of the wheel). The side may be inside (illustrated) or outside, but it should not interfere with the footrest (footrest). The guide 7 can also be provided directly on the frame (supporting rod) 1a so as to be movable and fixed in the front-rear direction.

  This wheelchair A has the above-described configuration. As shown in FIG. 4A, when a person gets on and reaches the step D and advances as it is, a step (stepped portion) D lower than the upper edge of the tapered surface 7a of the guide 7 is formed. In this case, first, when the guide 7 hits the step D (b in the same figure), the guide 7 pushes the step D by the forward inertial force (white arrow) that the wheelchair A has traveled so far, and the guide 7 A reaction force that pushes the guide 7 upward from the upper edge of the step D acts on the tapered surface 7a of the front surface of the front surface of the front surface of the front surface of the front wheel caster 5 so that the guide 7, that is, the front wheel caster 5 is lifted.

  When the front wheel caster 5 is raised (lifted), the front part of the lower part of the front wheel caster 5 that protrudes eventually comes into contact with the upper edge of the step D (FIG. 3c). At this time, the height of the rotation center c of the front wheel caster 5 is located within the height h of the tapered surface 7a of the guide 7, and the front portion 5a below the center c of the front wheel caster 5 from the plane including the tapered surface 7a Since it protrudes, the contacted portion 5a is below the rotation center c of the front wheel caster 5, and the preliminary caster 5 is easy to rotate in the direction of overcoming the step D, and it is easy to get over. For this reason, the wheelchair A easily gets over the step D by its forward force (from d to e in the figure). The main wheel 4 gets over the step D by turning it.

  When the step D is higher than the upper edge of the guide 7, as in the conventional case, if the front wheel caster 5 is slightly lifted and the step D becomes lower than the upper edge of the guide 7, the step D can be easily overcome by the above-described action. .

  FIG. 5 shows another example of the adjusting and fixing structure of the front wheel caster 5. In this embodiment, the support rod 1a of the frame 1 is formed in a cylindrical shape, and the front wheel caster 5 and the guide 7 are attached to the support rod 1a. Is inserted into the mounting rod 8 so that lateral holes 8a are formed at required intervals in the length direction of the mounting rod 8, and a fixing pin 9 made of a bolt, a nut, or the like is inserted into the hole 8a from the support rod 1a. The mounting rod 8 can be fixed to the support rod 1a. In this embodiment, the front wheel caster 5 is adjusted and fixed at a required position by fixing the mounting rod 8 by projecting the required length.

  In the above embodiment, the front wheel caster 5 has a support shaft in a direction perpendicular to the axis of the wheel that can freely rotate. However, the front wheel caster 5 can be made non-rotatable or both can be selected.

7 to 9a to c show still another embodiment. In this embodiment, an auxiliary wheel 15 is provided in front of the front wheel caster 5 and can be retreated upward from the ground contact position. The retreat distance (elevation distance) may be set as appropriate by experiments or the like in consideration of travelability, and is set to about 1 cm or less, for example.
The auxiliary wheel 15 is swingably attached to a frame 1b protruding forward from the middle of the footrest frame, and its swinging is restricted by a locking piece 16, a spring 17, a stopper pin 16a, and the like similar to a bicycle stand. Is done.

  That is, as shown in FIG. 9 a, when the locking piece 16 is tilted forward, the upper edge 16 b of the locking piece 16 is brought into contact with the metal fitting 16 c fixed to the frame 1 b by the spring 17, and beyond that of the auxiliary wheel 15. Prevent forward swing. On the other hand, as shown in FIG. 5B, when the locking piece 16 is tilted rearward, the stopper pin 16a of the locking piece 16 is brought into contact with the metal fitting 16c by the spring 17, and as shown in FIG. 15 is allowed to swing backward. At this time, the stopper pin 16a slides on the arc edge of the metal fitting 16c.

Therefore, for normal traveling, as shown in FIGS. 8 and 9c, the auxiliary wheels 15 are swung upward to prevent them from interfering with the traveling (the ground contact surface of the auxiliary wheels 15 is connected to the front wheel casters). 5). Since the auxiliary wheel 15 is not grounded, the distance between the axles of the front and rear wheels is the same as that of the prior art, so that the small turning ability is good.
However, if this small turning property is not required, the auxiliary wheel 15 may be always grounded for traveling.

In the stepped portion D, it is preferable that the auxiliary wheel 15 is lowered and grounded as shown in FIGS. 7 and 9a. The load on the front wheel caster 5 is reduced by the grounding of the auxiliary wheel 15, and the step D is overcome by the auxiliary wheel 15. At this time, since the load applied to the auxiliary wheel 15 is small compared to the case of using only the front wheel casters 5, the auxiliary wheel 15 gets over smoothly.
The rider of the wheelchair A may raise or lower the auxiliary wheel 15 by himself or a caregiver. Even if the auxiliary wheel 15 is not grounded and reaches the stepped portion D, the auxiliary wheel 15 is above the running surface, and the auxiliary wheel 15 is on the upper side, so that it is easy to get over the step D. For this reason, it is not always necessary to ground the auxiliary wheel 15 in the step portion D.

In the embodiment shown in FIG. 10, the raising / lowering means of the auxiliary wheel 15 is automated, and the auxiliary wheel 15 is raised and lowered by an elevator 18 such as an air cylinder, a hydraulic cylinder, a hydraulic jack, and a screw jack. is there.
The power source of the elevator 18 is provided by mounting an air supply device, a hydraulic device, a power source, etc. on the wheelchair A. This elevator is operated by a switch operation by a passenger.

  Similarly, in this embodiment, the auxiliary wheel 15 is appropriately raised for normal traveling, and the auxiliary wheel 15 is lowered and grounded at the step portion D to reduce the load on the front wheel caster 5. Get over the step D with the auxiliary wheel 15.

Also in the embodiment shown in FIGS. 7 and 10, as shown in the drawing, the auxiliary wheel 15 can be provided by attaching the guide 7 to the surrounding frame. In this case, similarly to the above, the height of the rotation center of the auxiliary wheel 15 is located within the height h of the taper surface 7a of the guide 7, and the plane including the taper surface 7a is below the rotation center of the auxiliary wheel 15. The outer peripheral surface of the front portion is in contact with or protrudes.
With this guide 7, the auxiliary wheel 15 smoothly gets over the step D with the same action as that provided in the front wheel caster 5.
In these embodiments, the auxiliary wheel 15 has a support shaft in a direction perpendicular to the axial center of the wheel that cannot rotate. However, the auxiliary wheel 15 may be rotatable or may be selected.

  Needless to say, the wheelchair A according to the present invention can easily get over the step D by a similar action even when a caregiver is present, and is also effective in that case. Of course, the strength and configuration of the structure such as the frame 1 need to be designed so that the strength of the wheelchair A conforms to the JIS standard.

  Although each said embodiment was the case of the wheelchair A, as shown to FIG. 11, FIG. 12, also in the handcart B which provided the caster 25 before and behind the mounting base 23, each said said means is employ | adopted. In this way, the same effect can be exhibited. The caster 25 on the rear side is usually one in which the support shaft in the direction perpendicular to the axis of the wheel cannot rotate, but can also be freely rotatable, or both can be selected.

In the embodiment of FIG. 11, as in the embodiment of FIG. 1, a mechanism 20 is provided in which the front caster 25 can be moved in the front-rear direction by the clip 6 and can be fixed at the moving position. The mechanism shown in FIG.
In the embodiment of FIG. 12, as in the embodiment of FIG. 7, an auxiliary wheel 15 is provided at the front portion of the mounting table 23, and the auxiliary wheel 15 can be moved away by the lifting mechanism 21. The elevating mechanism 21 may be the one shown in FIG.

Similar to each wheelchair A described above, these handcarts B can smoothly get over the stepped portion D and ensure smooth running on uneven roads, slopes, and side slope roads.
In the embodiment shown in FIG. 11, the front caster 25 can rotate a support shaft in a direction perpendicular to the axis of the wheel. In the embodiment shown in FIG. 12, the auxiliary wheel 15 rotates in a direction perpendicular to the axis of the wheel. Although it is impossible, it is also possible to make them non-rotatable or rotatable, or to select both of them.

Schematic side view of one embodiment of a wheelchair Main part enlarged side view of the same embodiment Main part front view seen from the left of FIG. Operational diagram of the embodiment Operational diagram of the embodiment Operational diagram of the embodiment Operational diagram of the embodiment Operational diagram of the embodiment Side view of main part of other embodiment Plan view Schematic side view of another embodiment Operational diagram of the embodiment Operational diagram of the embodiment Operational diagram of the embodiment Operational diagram of the embodiment Schematic side view of another embodiment A perspective view of an embodiment of a handcart Perspective view of another embodiment of handcart

Explanation of symbols

A Wheelchair D Step 1 Frame 1a Front wheel caster support rod 4 Main wheel 5 Front wheel caster 6 Fastening bracket 7 Guide 7a Guide taper surface 8 Front wheel caster mounting rod 8a Mounting rod hole 9 Mounting rod fixing pin 15 Auxiliary wheel 16 Engagement Stop piece 16a Stopper pin 16b Upper edge 16c of locking piece Fixing bracket 17 of frame 1b Spring 18 Elevator 23 Mounted table of handcart 25 Caster of handcart c Center of rotation of front wheel caster h Height of tapered surface of guide

Claims (12)

A seating portion 2 and a backrest portion 3 are provided between the left and right frames 1, 1, and left and right main wheels 4, 4 are provided outside the frame 1, 1. In wheelchair A provided with a front wheel caster 5
The front wheel caster 5 has a mounting position that can be moved in the front-rear direction and fixed at the moving position.   A guide 7 that protrudes forward from the front wheel caster 5 is attached to the frame of the front wheel caster 5, and the front surface of the guide 7 is formed as a tapered surface 7a that is inclined upward and has a height h of the tapered surface 7a. The height of the rotation center c of the front wheel caster 5 is located inside, and a front portion 5a below the rotation center c of the front wheel caster 7 protrudes from a plane including the tapered surface 7a. Wheelchair as described in   The wheelchair according to claim 1 or 2, wherein the front wheel casters (5) are fixed so as not to change direction. A seating portion 2 and a backrest portion 3 are provided between the left and right frames 1, 1, and left and right main wheels 4, 4 are provided outside the frame 1, 1. In wheelchair A provided with a front wheel caster 5
A wheelchair characterized in that an auxiliary wheel 15 capable of selecting a grounding position and a non-grounding position above the front wheel caster 5 is provided.   A guide 7 protruding forward from the auxiliary wheel 15 is attached to the frame of the auxiliary wheel 15, and the front surface of the guide 7 is formed as a tapered surface 7a that is inclined upward and has a height h of the tapered surface 7a. The height of the rotation center c of the auxiliary wheel 15 is located inside, and a front portion below the rotation center c of the auxiliary wheel 15 protrudes from a plane including the tapered surface 7a. The listed wheelchair.   The wheelchair according to claim 4 or 5, wherein the auxiliary wheel (15) is a fixed type that cannot change direction.   In the hand cart B provided with casters 25 before and after the mounting table, the front casters 25 are movable in the front-rear direction and fixed at the moving position.   A guide 7 that protrudes forward from the front caster 25 is attached to the frame of the front caster 25, and the front surface of the guide 7 is formed as a tapered surface 7a that is inclined upward and has a height h of the tapered surface 7a. The height of the rotation center c of the front caster 25 is located inside, and a front portion below the rotation center c of the front caster 25 protrudes from a plane including the tapered surface 7a. The described handcart.   9. The hand cart according to claim 7 or 8, wherein the front caster 25 is fixed so as not to change direction.   In the handcart B provided with casters 25 before and after the mounting table, an auxiliary wheel 15 capable of selecting a grounding position and a non-grounding position above the front caster 25 is provided.   A guide 7 protruding forward from the auxiliary wheel 15 is attached to the frame of the auxiliary wheel 15, and the front surface of the guide 7 is formed as a tapered surface 7a that is inclined upward and has a height h of the tapered surface 7a. The height of the rotation center c of the auxiliary wheel 15 is located inside, and a front portion below the rotation center c of the auxiliary wheel 15 protrudes from a plane including the tapered surface 7a. The described handcart.   The handcart according to claim 10 or 11, wherein the auxiliary wheel 15 is a fixed type that cannot change direction.

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