JP6175044B2 - Transport vehicle and frame structure - Google Patents

Description

  The present invention relates to a transport vehicle for transporting people and articles.

  Conventionally, various transport vehicles that can stably transport people and articles and can be folded when not in use have been used.

  For example, Patent Document 1 discloses a transport carriage that is stably supported by six wheels during traveling and can be folded to reduce the occupied floor area when not in use. In the transporting carriage, the loading platform (1) connects the front and rear end carriage parts (6a and 6b) each provided with wheels (2a to 3b) and the front and rear end carriage parts (6a and 6b) to each other and It comprises a cargo bed body (8) configured to be foldable in order to bring the front and rear carriages (6a, 6b) close to each other. The cargo bed body (8) includes two front and rear folding frames (9a, 9b). The loading platform (1) is provided with a pair of left and right universal wheels (2a, 2b) and (3a, 3b) on the lower sides of the front and rear ends, respectively. Orientation fixed wheels (4a, 4b) whose orientation is fixed in the direction are provided. And it has the interlocking opening / closing means (11) provided below the load support surface of the cargo bed main body (8), and this interlocking opening / closing means (11) holds the front and rear both end carriage parts (6a, 6b) in a fixed posture. In this state, an interlocking mechanism (14a, 14b, 15) for interlockingly opening and closing the two folding frames (9a, 9b) with each other is provided. In the transport cart, when the vehicle is not in use, when it is loaded on the cargo bed of the vehicle or stored in a limited space, the cargo body (8) is folded into an inverted V shape and the front and rear carriage portions (6a, 6b) Can be in a folded state adjacent to each other.

JP 2005-212635 A

  As described above, the transporting carriage disclosed in Patent Document 1 includes a structure that travels with six wheels including front and rear small wheels (2a to 3b) and a central fixed wheel (4a and 4b), and has high traveling stability. And However, in the transport cart of Patent Document 1, when the folding frames (9a, 9b) are folded, the fixed wheels (4a, 4b) are held in a state where they are raised from the ground. That is, the transport cart is supported by only four small wheels (2a to 3b) in its folded form. In the form in which such a transport carriage is folded, the center of gravity moves upward as the relatively large and heavy fixed wheels (4a, 4b) rise. And in the folding form, as a result of the occupied floor area of the transportation carriage becoming smaller, the support by the wheels (2a to 3b) becomes unstable, and the transportation carriage itself is very likely to fall over.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a transport vehicle that has a high running stability and can take a folded form with excellent stability.

The transport vehicle according to claim 1 includes a pair of front casters, a pair of rear casters, and a pair of wheels attached between the front casters and the rear casters, and can be folded in the front-rear direction. A transport vehicle,
A vertical frame standing on the front side and the rear side and supporting the front caster and the rear caster, respectively;
A support frame extending in a substantially vertical direction between the longitudinal frames and supporting the wheels;
A base frame constructed to be rotatable between each vertical frame and the support frame;
With
The support frame includes an insertion member having wheels attached thereto, and an extrapolation member to which the base frame is rotatably connected and slidably inserted with respect to the insertion member. .

The transport vehicle according to claim 2 is the transport vehicle according to claim 1, wherein the base frame is pivotally connected to the first connection member fixed to the extrapolation member,
By rotating the base frame with respect to both the vertical frame and the support frame, the extrapolation member slides upward, and the caster is disposed adjacent to the wheel while the wheel is grounded.

The transport vehicle according to claim 3 further includes an upper frame spanned between the vertical frame and the support frame above the base frame in the transport vehicle according to claim 1 or 2.
The upper frame and the base frame are parallel to each other, and the upper frame is pivotally connected to a second connecting member fixed to the extrapolating member above the first connecting member.

The transport vehicle according to claim 4 further includes an inclined frame that is inclined and bridged between the vertical frame and the support frame above the base frame in the transport vehicle according to any one of claims 1 to 3.
The inclined frame is inclined so that the end portion on the support frame side is positioned above, and the inclined frame is pivotally connected to a sliding connection member that is slidably disposed along the extrapolation member. It is characterized by

  The transport vehicle according to claim 5 is the transport vehicle according to any one of claims 1 to 4, further comprising a brake capable of braking the wheel, wherein the wheel has a no-puncture tire.

  A transport vehicle according to a sixth aspect of the present invention is the transport vehicle according to any one of the first to fifth aspects, wherein the transport vehicle is used as a stroller or an evacuation cart capable of accommodating a person and traveling.

The frame structure for a transport vehicle according to claim 7,
A vertical frame that extends in a substantially vertical direction and supports the casters;
A support frame extending substantially vertically and supporting the wheels;
A base frame rotatably mounted between the vertical frame and the support frame;
An inclined frame that is inclined and bridged between the vertical frame and the support frame above the base frame, and is inclined so that the end portion on the support frame side is positioned above,
With
The support frame includes an insertion member on which a wheel is attached, and an extrapolation member that is connected to the base frame so as to be rotatable and is slidably inserted with respect to the insertion member.
An inclined frame is pivotally coupled to a sliding coupling member that is slidably disposed along the extrapolation member.

  According to the transport vehicle of the present invention, the support frame includes an extrapolation member in which wheels are attached and an extrapolation in which the base frame is rotatably connected and slidably inserted into the interposer member. And a member. As a result, when the base frame is rotated with respect to the support frame to fold the vertical frame in the proximity direction with respect to the support frame, only the extrapolation member is moved upward while maintaining the insertion member of the support frame in place. Can be slid. And a front caster and a rear caster can be arranged adjacent to a wheel in the state where a wheel was grounded, and a cart can be folded up in the direction of order. That is, in the folded form of the traveling structure, the wheel does not rise, so that the center of gravity can be maintained at a relatively low position, and the traveling structure can be stably supported by the caster and the wheel. Therefore, the transport vehicle of the present invention greatly reduces the possibility of the transport vehicle falling over in the folded configuration while ensuring high running stability by the front casters, the rear casters and the wheels.

1 is a schematic perspective view of a transport vehicle according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of a transportable vehicle in which a cover member is omitted from the transport vehicle of FIG. 1. The schematic side view of the transport vehicle of FIG. FIG. 4 is a partial cross-sectional view of the transport vehicle of FIG. 3. FIG. 3 is a schematic exploded perspective view of the transport vehicle of FIG. 2. FIG. 6 is a partially enlarged perspective view of the transport vehicle of FIG. 5. The schematic perspective view of the conveyance vehicle of the folding form which abbreviate | omitted the cover member from the conveyance vehicle of FIG. The schematic side view of the transport vehicle of FIG. The fragmentary sectional view of the transport vehicle of FIG. The schematic perspective view of the conveyance vehicle of the modification of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the shape of each figure referred in the following description is a conceptual diagram or a schematic diagram for explaining a suitable shape dimension, and a dimension ratio etc. do not necessarily correspond with an actual dimension ratio. That is, the present invention is not limited to the dimensional ratio in the drawings.

  FIG. 1 is a schematic perspective view of a front-rear folding cart 100 according to an embodiment of the present invention. In this embodiment, the transport vehicle 100 is a stroller or an evacuation cart that can accommodate and run a person. As shown in FIG. 1, in the transport vehicle 100, a sheet-like cover member 106 is stretched on each surface except the upper surface of the frame structure 110. The cover member 106 covers the bottom surface, both side surfaces, and the front and back surfaces in a box shape so that the top surface is open, and defines an accommodation space 105 that can accommodate one or more people. In this accommodation space 105, it is assumed that generally, but not limited to, elderly people with weak legs, injured persons, persons with disabilities, infants and the like who are difficult to walk are accommodated. A handle 108 is provided at the rear of the transport vehicle 100. An operator grips the handle 108 and causes the transport vehicle 100 to travel. In other words, the transport vehicle 100 accommodates people who have difficulty in traveling, can help to move quickly during disaster evacuation, and can be used for walking assistance. However, the transport vehicle of the present invention is not limited to this application.

  Hereinafter, with reference to FIG. 2 thru | or 9, the frame structure 110 of the transport vehicle 100 of this embodiment is demonstrated in detail. 2 and 3 are a perspective view and a side view of the transport vehicle 100 in a travelable state with the cover member 106 removed. FIG. 4 is a partial cross-sectional view of FIG. FIG. 5 is an exploded perspective view of the frame structure 110. FIG. 6 is a partially exploded view of the frame structure 110. 7 and 8 are a perspective view and a side view of the transport vehicle 100 in a folded state with the cover member 106 removed. FIG. 9 is a partial cross-sectional view of FIG.

  As shown in FIGS. 2 and 3, the transport vehicle 100 of the present embodiment includes a pair of front casters 101 provided on the front side, and a pair of rear casters 102 provided on the rear side of the front casters 101, A pair of wheels 103 attached between the front caster 101 and the rear caster 102, and a frame structure 110 that supports the front caster 101, the rear caster 102, and the wheel 103 are provided.

  The front caster 101 and the rear caster 102 are supported by the frame structure 110 so as to be able to turn, and are used for changing the traveling direction of the transport vehicle 100. On the other hand, the wheel 103 is fixedly supported by the frame structure 110 so as to rotate only in the front-rear direction (not to turn). The wheel 103 has a larger diameter than the wheel portions of the front caster 101 and the rear caster 102. The wheels 103 realize high traveling stability of the transport vehicle 103. The wheel 103 is formed of a no-puncture tire that contains a foamable resin instead of air. This reduces the risk of puncture during a disaster and achieves higher safety.

  The wheel 103 can be braked by a brake 104 attached in the vicinity thereof. That is, by applying the brake 104, it is possible to lock the rotation of the wheel 103 and stop the transport vehicle 100 safely. Although not shown, a handle lever may be provided in the vicinity of the handle 108 so that the operator can operate the brake while holding the handle 108, and the brake 104 may be connected to the handle lever with a wire.

  The frame structure 110 of the present embodiment is a structure in which a pair of side frames having the same shape and configured by a plurality of pipes are connected in the left-right width direction (via the pipes). That is, the frame structure 110 has a symmetrical structure in the width direction. According to the side view of FIG. 3, the frame structure 110 supports the front caster 101, supports the first vertical frame 111 extending in a substantially vertical direction, and the rear caster 102, and extends in a substantially vertical direction. Two vertical frames 112 and a support (expandable) frame 113 that supports the wheels 103 and extends and contracts between the first vertical frame 111 and the second vertical frame 112 in a substantially vertical direction are provided. That is, the first vertical frame 111, the second frame 112, and the support frame 113 are erected substantially parallel to each other.

  In the vicinity of the lower end of the frame structure 110, a first base frame 114 extending in a substantially horizontal direction is rotatably mounted between the first vertical frame 111 and the support frame 113, and a second extending in a substantially horizontal direction. A base frame 115 is rotatably installed between the support frame 113 and the second vertical frame 112. And in the form which can drive | work, the 1st base frame 114 and the 2nd base frame 115 have aligned on the straight line.

  Further, in the middle of the frame structure 110, a first inclined frame 116 disposed above the first base frame 114 is inclined between the first vertical frame 111 and the support frame 113 so as to be inclined obliquely forward and downward. In addition, the second inclined frame 117 disposed above the second base frame 114 is inclined between the support frame 113 and the second vertical frame 112 so as to be inclined forward and upward. . That is, the inclined frames 116 and 117 are inclined so that the end portions on the support frame 113 side are positioned higher than the end portions on the vertical frames 111 and 112 side. The end portions on the support frame 113 side of the first inclined frame 116 and the second inclined frame 117 are located at the same height, and the end portions on the vertical frames 111 and 112 side are located at the same height.

  A first upper frame 118 disposed above the first inclined frame is bridged substantially horizontally between the first vertical frame 111 and the support frame 113 and is disposed above the second inclined frame 117. The second upper frame 119 is bridged between the support frame 113 and the second vertical frame 112 substantially horizontally. And in the form which can drive | work, the 1st upper frame 118 and the 2nd upper frame 119 have aligned on the straight line. That is, the upper frames 118 and 119 and the base frames 114 and 115 are arranged in parallel, and they rotate along the same locus.

  In the frame structure 110, the first vertical frame 111 is located at the front end of the transport vehicle 100 and has a rectangular frame shape in front view (front view). The shafts of the pair of front casters 101 are welded to the lower ends of both sides in the width direction of the first vertical frame 111, respectively, and the pair of front casters 101 are supported so as to be turnable. In addition, a lower connecting portion 111 a protruding in the front-rear side is fixed (welded) to the lower end of the first vertical frame 111. The pair of lower link portions 111a pivotally support the lower end of the opening / closing member (frame) 107 on the front side. On the other hand, the pair of lower tier coupling parts 111a pivotally couple the front ends of the pair of first base frames 114 on the rear side. Further, a middle connecting portion 111b protruding rearward is fixed (welded) above the lower connecting portion 111a of the first vertical frame 111. The pair of middle-stage coupling portions 111b pivotally connect the front ends of the pair of first inclined frames 116 on the rear side. An upper connecting portion 111c protruding rearward is fixed (welded) above the middle connecting portion 111b of the first vertical frame 111. The pair of upper connection portions 111c connect the front ends of the pair of first upper frames 118 on the rear side in a rotational manner. The middle connecting portion 111b is disposed closer to the lower connecting portion 111a.

  The opening / closing member 107 axially connected to the first vertical frame 111 is configured to be able to open and close the front surface of the frame structure 110 of the transport vehicle 100. The opening / closing member 107 is formed in a panel shape with a cover member 106 stretched on a frame (see FIG. 1). On the other hand, the cover member 106 is not stretched on the first vertical frame 111. That is, it is possible to form an entrance for the user to enter the accommodation space 105 by rotating the opening / closing member 107 forward to open the front surface. Then, by locking the front surface with the opening / closing member 107 (for example, with a chain or a lock), the user can travel safely without dropping from the accommodation space 105 when the transport vehicle 100 travels.

  In the frame structure 110, the second vertical frame 112 is located at the rear end of the transport vehicle 100 and has a rectangular frame shape in rear view (rear view). The shafts of a pair of rear casters 102 are welded to the lower ends of both sides of the second vertical frame 112 in the width direction, and the pair of rear casters 102 are supported so as to be able to turn. Further, a lower connecting portion 112 a protruding forward is fixed (welded) to the lower end of the second vertical frame 112. The pair of lower tier coupling portions 112a pivotally couple the rear ends of the pair of second base frames 115 on the front side. Further, a middle connecting portion 112b protruding forward is fixed (welded) above the lower connecting portion 112a of the second vertical frame 112. The pair of middle-stage coupling portions 112b pivotally connect the rear ends of the pair of second inclined frames 117 on the front side. An upper connecting portion 112c protruding forward is fixed (welded) above the middle connecting portion 112b of the second vertical frame 112. The pair of upper connecting portions 112c connect the rear ends of the pair of second upper frames 119 on the front side in a pivotal manner. The middle connecting portion 112b is disposed closer to the lower connecting portion 112a. And each connection part 112a-c of the 2nd vertical frame 112 is each arrange | positioned at the same height as each connection part 111a-c of the 1st vertical frame 111, respectively.

  In the frame structure 110, a pair of support frames 113 extend vertically between the first vertical frames 111 and the second vertical frames 112. FIG. 4 is a partial cross-sectional view showing the internal structure of the support frame 113. As shown in FIG. 4, the support frame 113 includes a long insertion member 113a and a long insertion member 113b that is slidably inserted into the insertion member 113a. In other words, the outer insertion member 113b is a hollow tube having a diameter that can accommodate (insert) the insertion member 113a.

  The insertion member 113a includes an axle support portion 113c that can support the axle 103a of the wheel 103 at the lower end thereof. That is, the insertion member 113a rotatably supports the wheel 103 via the axle support portion 113c. The axle support portion 113c integrally projects in a step shape radially outward of the interior member 113a, and the projecting portion of the axle support portion 113c (the step portion of the interior member 113a) and the lower end surface of the outer insertion member 113b Engageable. As shown in FIG. 4, in the travelable form in which the insertion member 113a is accommodated in the outer insertion member 113b, the axle support portion 113c protrudes below the outer insertion member 113b at the lower end of the insertion member 113a. And the lower end surface of the exterior member 113b is supported by the axle support part 113c of the insertion member 113a. That is, in the present embodiment, the support frame 113 is in the most shortened state in the traveling posture in which the six wheels are in a horizontal position.

  The extrapolation member 113b includes a first (fixed) connecting member 121 attached in the vicinity of the lower end thereof, a sliding connecting member 122 disposed so as to be slidable in the longitudinal direction above the first connecting member 121, And a second (fixed) connecting member 123 attached to the upper end of the extrapolating member 113b. 3 and 4, the sliding connection member 122 is disposed at a position adjacent to the second connection member 123 in the vicinity of the upper end of the support frame 113 (external insertion portion 113b). In the folded form to be described later, the sliding connection member 122 slides to the lower side of the extrapolation portion 113b.

  FIG. 5 is an exploded perspective view showing the connection relationship between the support frame 113, the base frames 114 and 115, the inclined frames 116 and 117, and the upper frames 118 and 119. FIG. 6 is an exploded view showing the relationship between the extrapolation member 113b and the connecting members 121-123. As shown in FIGS. 5 and 6, the first connecting member 121 is fixed (welded) to the outer insertion member 113b, and has connecting portions that protrude before and after the outer insertion member 113b so that the frame can be connected. A first base frame 114 rear end and a second base frame 115 front end are pivotally connected to the first connecting member 121. The slide-type connecting member 122 has a connecting portion projecting so that the frame can be connected to the front and rear of the outer insertion member 113b. The sliding connection member 122 is connected to the rear end of the first inclined frame 116 and the front end of the second inclined frame 117 in a rotational manner. The second connecting member 123 is fixed to the upper end portion of the outer insertion member 113b with a bolt, and has a connecting portion that projects before and after the outer insertion member 113b so that the frame can be connected. The rear end of the first upper frame 118 and the front end of the second upper frame 119 are connected to the second connecting member 123 in a pivotal manner.

  That is, the support frame 113 includes an insertion member 113a that supports the wheel 103 and an extrapolation member 113b that is pivotally connected to the frames 114 to 119. The telescopic member 113b can be telescopically expanded and contracted so that the outer member 113b moves relative to the inner member 113a in accordance with the rotation of the frames 114 to 119. In this transportable vehicle 100, it is preferable that the interior member 113a and the exterior member 113b are fixed to each other with a pin through a through hole (not shown). Or you may hold | maintain the interior member 113a and the external insertion member 113b in the free state which can be slid mutually. In the latter case, during running, the interior member 113a moves relative to the extrapolation member 113b relative to the unevenness of the ground, and the wheel 103 moves up and down. That is, the wheel 103 can follow the unevenness of the ground and maintain the traveling posture in contact with the six wheels as much as possible, thereby providing more stable traveling.

  As shown in FIGS. 7 and 8, the transport vehicle 100 of this embodiment can be folded in the front-rear direction so that the first vertical frame 111 and the second vertical frame 112 are close to the support frame 113. At this time, the front caster 101 and the rear caster 102 are disposed so that a part of the front caster 101 and the rear caster 102 is positioned inside the wheel 103 in the width direction. In this folded configuration, the rear ends of the first base frame 114, the first inclined frame 116, and the first upper frame 118 are rotated upward with respect to the first vertical frame 111, and the second vertical frame The front ends of the second base frame 115, the second inclined frame 117, and the second upper frame 119 are rotated upward with respect to 112. At this time, the slide type connecting member 122 moves upward from the travelable state, but slides downward due to the relative position with the external insertion member 113b.

  And in the transport vehicle 100 of this embodiment, as shown in FIG. 9, each flame | frame 114-119 rotates with respect to the external insertion member 113b of the support frame 113 via the connection members 121-123, and the external insertion member 113b. Is pulled upward with respect to the insertion member 113a. That is, the support frame 113 is in an extended state. And since the motion of each frame 114-119 does not act on the insertion member 113a, the insertion member 113a is maintained on the spot, and the wheel 103 is grounded together with the casters 101 and 102. That is, the transport vehicle 100 of this embodiment can be folded back and forth so that the front caster 102 and the rear caster 102 are disposed adjacent to the wheel 103 while the wheel 103 is grounded. In this folded configuration, the front caster 102, the rear caster 102, and the wheels 103 are in contact with the ground and the center of gravity is maintained at a relatively low position, so that the transport vehicle 100 is stably placed. The

  In the folding-type transport vehicle 100 of the present embodiment, it is preferable that the upper end of the interior member 113a is processed so as not to fall out from the lower end of the outer insertion member 113b in a state where the support frame 113 is extended. For example, although not shown, by providing a flange on the upper end of the interior member 113a and providing a flange portion projecting inwardly on the lower end of the exterior member 113b, it can be prevented from falling off due to end engagement. Alternatively, it can be prevented from falling off by forming a through hole in the interior member 113a and the exterior member 113b and fixing both with a pin in the folded form.

  In addition, each frame of the frame structure 110 of this embodiment is comprised with the hollow pipe made from SUS. However, the present invention is not limited to this, and other metal materials, hard synthetic resins, and wood materials may be selected for the frame structure.

  Hereinafter, the effect of the transport vehicle 100 of this embodiment is demonstrated.

  According to the transport vehicle 100 of the present embodiment, the support frame 113 is rotatably connected to the insertion member 113a on which the wheel 103 is attached, and at least the first base frame 114 and the second base frame 115. And an extrapolating member 113b slidably extrapolated with respect to the intercalating member 113a. Accordingly, the first base frame 114 is rotated with respect to the first vertical frame 111 and the support frame 113 in order to fold the first vertical frame 111 and the second vertical frame 112 in the proximity direction, and the second base frame 115 is rotated. When the frame is rotated with respect to the second vertical frame 112 and the support frame 113, only the outer insertion member 113b can be slid upward while maintaining the insertion member 113a of the support frame 113 in place. And the front caster 101 and the rear caster 102 can be arrange | positioned adjacent to the wheel 103 in the state which grounded the wheel 103, and the conveyance vehicle 100 can be folded in the front-back direction. That is, in the folded form of the transport vehicle 100, the wheel 103 does not rise, so the center of gravity is maintained at a relatively low position, and the transport vehicle 100 is stably supported by the six wheels of the front caster 101, the rear caster 102, and the wheel 103. It is possible. Therefore, the transport vehicle 100 according to the present embodiment greatly reduces the risk of the transport vehicle 100 falling over in the folded configuration while ensuring high traveling stability by the front casters 101, the rear casters 102, and the wheels 103. .

  Furthermore, according to the transport vehicle 100 of the present embodiment, the frame structure 110 has higher strength by providing the inclined frames 116 and 117 and the upper frames 118 and 119 in addition to the base frames 114 and 115. Yes. In particular, the slide type connecting member 122 that is slidable in the longitudinal direction is disposed on the outer insertion member 113 b, so that the inclined frames 116 and 117 are rotated between the vertical frames 111 and 112 and the support frame 113 by being inclined from the horizontal direction. It was built dynamically. That is, in the form in which the transport vehicle 100 can travel, the inclined frames 116 and 117 are bridged from the lower side of the vertical frames 111 and 112 to the upper side of the support frame 113. Thereby, it is possible to effectively reinforce the frame structure 110 without hindering the folding operation.

[Modification]
The transport vehicle of this invention is not limited to the said embodiment, For example, it can deform | transform as follows.

(1) In the above embodiment, the transport vehicle 100 is a stroller or an evacuation cart, but the transport vehicle of the present invention is not limited to the application. The application of the transport vehicle may be, for example, a cargo transport cart, a stretcher, a display wagon, a shopping cart, or the like. FIG. 10 is a schematic view showing an embodiment in which the transport vehicle of the present invention is a stretcher (stretcher). The transport vehicle 100 ′ in FIG. 10 is configured by laying a mat 109 on the upper frames 118 and 119, excluding the opening / closing member, the cover material, and the accommodation space, and each component is common to the above embodiment. In other words, the transport vehicle can be modified according to its use within the technical scope of the present invention.

(2) In the above embodiment, a metal pipe is used as each frame, but the present invention is not limited to this. For example, instead of a pair of left and right pipe-shaped frames, a single panel-shaped frame can be adopted. More specifically, each frame may be a panel extending in the width direction, and each panel may be rotatably connected by a hinge.

(3) In the above embodiment, each frame extends perpendicularly to the vertical direction and the horizontal direction, and forms a substantially rectangular parallelepiped framework. However, each frame may be inclined to some extent from the vertical direction and the horizontal direction as long as the effects of the present invention can be exhibited.

(4) In the above embodiment, the support frame 113 is most shortened in the traveling posture in which the six wheels are in the horizontal position. However, the support frame may be shortened and extended from a configuration in which the six wheels are in a horizontal position. And, by allowing the extrapolation member and the insertion member to slide freely during traveling, the wheel can move up and down according to the unevenness of the ground, and can travel more stably on the uneven ground. It becomes possible.

  The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes as long as they belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Transport vehicle 101 Front caster 102 Rear caster 103 Wheel 103a Axle 104 Brake 105 Housing space 106 Cover member 107 Opening and closing member 108 Handle 109 Mat 110 Frame structure 111 1st vertical frame 111a Lower connection part 111b Middle connection part 111c Upper connection part 112 2nd vertical frame 112a Lower connection part 112b Middle connection part 112c Upper connection part 113 Support frame 113a Inner member 113b Outer member 113c Axle support part 114 First base frame 115 Second base frame 116 First inclined frame 117 Second inclination Frame 118 First upper frame 119 Second upper frame 121 First connecting member 122 Sliding connecting member 123 Second connecting member

Claims (7)

A pair of front casters, a pair of rear casters, and a pair of wheels attached between the front casters and the rear casters, and a foldable vehicle that can be folded in the front-rear direction,
A vertical frame that is erected on the front side and the rear side and supports the front casters and the rear casters, respectively.
A support frame extending in a substantially vertical direction between the longitudinal frames and supporting the wheels;
A base frame rotatably mounted between each vertical frame and the support frame;
With
The support frame includes an insertion member on which the wheel is attached, and an extrapolation member to which the base frame is rotatably connected and is slidably inserted with respect to the insertion member. A transport vehicle characterized by The base frame is pivotally connected to a first connecting member fixed to the extrapolation member,
By rotating the base frame with respect to both the vertical frame and the support frame, the extrapolation member slides upward, and the caster is disposed adjacent to the wheel while the wheel is grounded. The transport vehicle according to claim 1, wherein An upper frame spanned between the vertical frame and the support frame above the base frame;
The upper frame and the base frame are parallel to each other, and the upper frame is pivotally coupled to a second coupling member fixed to the extrapolation member above the first coupling member. The transport vehicle according to claim 1 or 2. Further comprising an inclined frame that is inclined and bridged between the vertical frame and the support frame above the base frame;
The inclined frame is inclined so that the end portion on the support frame side is positioned above, and the inclined frame is pivoted to a sliding connection member that is slidable along the extrapolation member. The transport vehicle according to claim 1, wherein the transport vehicle is connected to the vehicle.   The vehicle according to any one of claims 1 to 4, further comprising a brake capable of braking the wheel, wherein the wheel has a no-puncture tire.   6. The transport vehicle according to claim 1, wherein the transport vehicle is used as a stroller or an evacuation cart that can accommodate and run a person. A vertical frame that extends in a substantially vertical direction and supports the casters;
A support frame extending substantially vertically and supporting the wheels;
A base frame rotatably mounted between the vertical frame and the support frame;
An inclined frame that is inclined and bridged between the vertical frame and the support frame above the base frame, and is inclined so that an end portion on the support frame side is positioned further upward;
With
The support frame includes an insertion member on which a wheel is attached, and an extrapolation member that is connected to the base frame so as to be rotatable and is slidably inserted with respect to the insertion member.
A frame structure of a transport vehicle, wherein the inclined frame is pivotally coupled to a sliding coupling member that is slidably disposed along the extrapolation member.

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