JP6354573B2 - Transport cart - Google Patents

Description

  The present invention relates to a transport carriage used for transporting a transported object.

In the factory, when carrying various parts, products, etc., a carrier cart that can be manually pushed by an operator or pulled by a towing vehicle is often used. In order to improve the convenience of the conveyance carriage, various devices have been devised to add various functions to the wheels provided in the conveyance carriage.
For example, in the fixed / universal type carriage of Patent Document 1, a state in which the movable part is grounded and a state in which the movable surface is not grounded can be formed with respect to the base part provided with a plurality of universal wheels. It is disclosed to provide a single fixed wheel. By providing this fixed type wheel, it is possible to easily change the direction, and the convenience of storage and entry into a narrow place is improved.
In addition, for example, in the towed vehicle of Patent Document 2, it is described that a cushion damper for moving the left and right rotatable wheels up and down is used when the travel path is uneven.

JP 7-242175 A JP 2014-4859 A

  However, in the conventional transport carriage, no ingenuity has been made to minimize the inner ring difference (difference in the radius of the arc drawn by the front wheel and the rear wheel) as much as possible, and to suppress the left-right wobbling when the transport carriage moves forward. This wobbling to the left and right becomes prominent when the transport carriage moves on a moving surface (ground) with a step or unevenness. In Patent Document 2, when wheels are arranged at the front and rear, an inner wheel difference occurs in the tow vehicle, and when the wheels are arranged in a horizontal row, there remains a problem that the posture of the tow vehicle is difficult to stabilize.

  The present invention has been made in view of such a background, can minimize the difference between the inner rings, suppress the left-right wobbling during movement, flexibly follow the step or unevenness in the ground, the posture It was obtained in an attempt to provide a transport cart that can stably maintain the vehicle.

One aspect of the present invention is a transport carriage used for transporting a transported object,
A loading platform on which the transported goods are loaded;
At least three universal wheels provided on the cargo bed so as to be rotatable around a vertical rotation axis;
It is arranged from the end of the cargo bed to the middle region in the front-rear direction and the left-right direction of the cargo bed, and swings with a rocking base end that engages with the edge of the cargo bed as a fulcrum. A swing frame that swings the swing unit positioned in the vertical direction;
A fixed wheel provided on the lower surface of the rocking portion of the rocking frame and having a rotation axis oriented in the left-right direction;
At the end of the loading platform, a base end mounting portion is mounted above the swing base end portion of the swing frame, and the swing frame is disposed obliquely downward from the base end mounting portion. And a damper for biasing the oscillating portion of the oscillating frame downward by utilizing a viscous resistance of a fluid. .

In the transport cart, the swing frame is arranged from the end of the loading platform to the middle region in the front-rear direction and the left-right direction of the loading platform, and on the lower surface of the swinging portion of the swinging frame located in the middle region of the loading platform, A fixed wheel having a rotation axis oriented in the left-right direction is provided. Further, the swing frame receives a biasing force from the damper, and can swing the fixed wheel in the vertical direction.
When the transport carriage is moved by towing by a towing vehicle or manually pushed by an operator, the free wheel is grounded and the fixed wheel is grounded. And, because the fixed wheel that can rotate only in the front-rear direction is located in the middle area as the center part of the loading platform, when the transport cart is bent and moved left and right, the fixed wheel can change the posture of the transport cart. It can be the starting point when changing from left to right. As a result, the transport carriage can bend and move to the left and right with almost no difference between the inner rings, and the left and right wobbling of the transport carriage can be suppressed.

  Further, when the transport carriage moves on a ground with a step or unevenness, any of the free wheels may float from the ground. Even in this case, it is possible to form a state in which the fixed wheel positioned in the intermediate region as the center portion of the loading platform flexibly follows the level difference or unevenness of the ground and is always in contact with the ground. As a result, the fixed wheel always supports the intermediate region as the center part of the cargo bed, and prevents the transport cart from slipping without the fixed wheel being grounded when the transport cart moves. Can do.

  Furthermore, the swing frame is disposed from the end of the loading platform to the middle region of the loading platform, and the damper can be disposed obliquely downward in a direction as close as possible to the direction in which the swing frame is disposed. Thereby, a damper can be accommodated below the upper surface of a loading platform, the height of a loading platform can be maintained low, and the length dimension of the damper to be used can be taken large. Therefore, the range in which the fixed wheel can swing in the vertical direction can be easily secured.

  Therefore, according to the transport carriage, the difference between the inner rings can be minimized, and the left and right wobbling during movement can be suppressed, and the posture can be stabilized by flexibly following the steps or irregularities on the ground. Can keep.

Explanatory drawing which shows the state which looked at the conveyance trolley | bogie from the left-right direction concerning an Example. Explanatory drawing which shows the state which looked at the conveyance trolley | bogie from an upper direction concerning an Example. Explanatory drawing which shows the state which looked at a part of conveyance cart concerning the Example from the front-back direction. Explanatory drawing which shows the state which detected the time of the damper base end side abnormality by the abnormality detection member concerning an Example. Explanatory drawing which shows the state which detected the time of a damper front end side abnormality by the abnormality detection member concerning an Example. Explanatory drawing which shows the state which detected the time of wheel abnormality by the abnormality detection member concerning an Example.

A preferred embodiment of the above-described transport carriage will be described.
The transport carriage is movably provided on the swing frame, and when the damper proximal end is abnormal, that is, when the base end mounting portion of the damper is detached from the end of the cargo bed, When the front end of the damper, which is when the front end mounting portion of the damper is detached from the swinging portion, is abnormal, or when an abnormality occurs in the support state of the wheel portion of the fixed wheel by the wheel support portion of the fixed wheel When the wheel is abnormal, the damper is extended or the wheel part of the fixed wheel is moved by receiving a force that rises relative to the wheel support part of the fixed wheel. You may further provide the abnormality detection member for detecting the abnormality of the said fixed wheel.

  By using the abnormality detection member, even when an abnormality occurs in the damper mounting state or the fixed wheel support state, an operator or the like can easily detect this abnormality. As a result, when an abnormality occurs in the mounting state of the damper or the support state of the fixed wheel, an operator or the like can detect this abnormality at an early stage, and improve the reliability of the transport carriage using the damper and the fixed wheel. be able to.

The abnormality detection member is a first abnormality detection member attached to the swing frame in a swingable manner at a swing intermediate portion located between the swing base end portion and the swing portion. And a second abnormality detection member that is rotatably connected to the first abnormality detection member and slides upon receiving the rotation of the first abnormality detection member, and is provided at the end of the cargo bed. May be provided with a display plate that can be rotated by receiving a slide of the second abnormality detecting member.
When an abnormality occurs in the damper mounting state or the wheel support state, the abnormality can be further easily detected by an operator or the like by rotating the display board from the initial position to the display position.

Below, the Example concerning a conveyance trolley is described with reference to drawings.
As shown in FIGS. 1 and 2, the transport cart 1 of this example is used for transporting a transported object 8. The transport carriage 1 includes a loading platform 2, a free wheel 31, a swing frame 4, a fixed wheel 32, and a damper 5.
The loading platform 2 is a portion on which the conveyed product 8 is loaded, and has a loading surface 20 on which the conveyed product 8 is loaded. Three universal wheels 31 are provided on the lower surface of the loading platform 2 so as to be rotatable around a rotation axis 310 in the vertical direction H. The swing frame 4 is disposed from the front end portion 201 of the loading platform 2 to the central portion as an intermediate region between the longitudinal direction L and the lateral direction W of the loading platform 2. The swing frame 4 swings with a swing base end 41 engaged with the front end 201 of the loading platform 2 as a fulcrum and moves a swinging portion (swing tip) 42 located at the center of the loading platform 2 up and down. It is configured to swing in the direction H.

  As shown in FIG. 3, the fixed wheel 32 is provided on the lower surface of the swing portion 42 of the swing frame 4 with the rotation axis 320 directed in the left-right direction W. As shown in FIG. 1, the base end attachment portion 51 of the damper 5 is attached above the swing base end portion 41 of the swing frame 4 at the front end portion 201 of the loading platform 2. 52 is attached to the swinging portion 42 of the swinging frame 4 in a state of being disposed obliquely downward from the base end mounting portion 51. The damper 5 is configured to urge the swinging portion 42 of the swinging frame 4 downward using the viscous resistance of the fluid.

Below, the conveyance trolley | bogie 1 of this example is explained in full detail with reference to FIGS.
The transport cart 1 of this example is configured to be pulled by a towing vehicle in a state where a plurality of vehicles are connected. The plurality of transport carts 1 are guided to move in the front-rear direction L by the fixed wheels 32 when pulled by the towing vehicle. The trolley carrier 1 can move, for example, from a storage position of a transported object 8 (products, parts, etc.) in a factory to another storage position or a shipping position. Further, when each carriage 1 is manually pushed by an operator, the direction can be easily changed by rotating around a vertical axis with the fixed wheel 32 as a fulcrum.

  As shown in FIG. 1, the loading platform 2 includes a frame portion 21 formed in a square frame shape, and a top plate portion 22 provided on the frame portion 21. A handle portion 211 that can be manually pushed by an operator is provided at the front end portion 201 of the frame portion 21. The front end 201 of the loading platform 2 is provided with a towing arm 26 that is connected to the towing vehicle. The middle portion of the loading platform 2 (auxiliary frame 23 to be described later) is provided with a towing arm of another transport cart 1. A pulling engagement portion 27 for connecting and pulling 28 is provided. In FIG. 2, the top plate 22 is omitted.

As shown in FIG. 2, the free wheel 31 of this example is provided at two places on the left and right of the front part on the lower surface of the loading platform 2 and one place on the left and right center of the rear portion on the lower surface of the loading platform 2. The universal wheels 31 may be provided at a total of four locations on the left and right of the front portion and the rear portion on the lower surface of the loading platform 2.
The swing frame 4 is arranged from the front end portion 201 of the loading platform 2 to the center portion of the loading platform 2 in the front-rear direction L and the left-right direction W. The center portion of the loading platform 2 is a portion including not only the central portion when the loading platform 2 is viewed in plan but also the periphery of this central portion.

The swing frame 4 is disposed substantially horizontally from the center position in the left-right direction W at the front end 201 of the loading platform 2 toward the rear. The swing center axis 410 of the swing base end 41 of the swing frame 4 that engages with the front end 201 of the load platform 2 is directed in the left-right direction W of the load platform 2.
An auxiliary frame portion 23 is provided in the left-right direction W at the center position of the loading platform 2 in the front-rear direction L. On the lower surface of the auxiliary frame portion 23, a damper guide portion 24 that guides the swing portion 42 of the swing frame 4 from the left and right is provided.

  As shown in FIGS. 1 and 6, the damper 5 of this example is an oil damper that utilizes the viscous resistance of oil as a fluid. The damper 5 may be an air damper that uses the viscous resistance of air as a fluid. The damper 5 has a cylinder 53 and a piston rod 54 that strokes against the cylinder 53, and always generates a biasing force in a direction in which the piston rod 54 projects from the cylinder 53. The end portion of the cylinder 53 as the base end mounting portion 51 of the damper 5 is rotatably attached above the swing base end portion 41 of the swing frame 4 at the front end portion 201 of the loading platform 2. An end portion of the piston rod 54 as the tip mounting portion 52 of the damper 5 is rotatably attached to the swinging portion 42 of the swinging frame 4.

  The damper 5 has a tilt angle of 3 to 20 ° with respect to the horizontal direction, and is disposed from the proximal end mounting portion 51 to the distal end mounting portion 52. The base end mounting portion 51 of the damper 5 is disposed below the top plate portion 22 of the loading platform 2. Further, the tip mounting portion 52 of the damper 5 of this example is provided at a position offset in the left-right direction W with respect to the swing frame 4. The reason for this is to prevent the tip mounting portion 52 of the damper 5 detached from the swinging portion 42 of the frame 4 from interfering with the swinging frame 4 at the time X2 when the damper tip side is abnormal. Further, in FIG. 2, the state in which the entire damper 5 is offset in the left-right direction W with respect to the swinging frame 4 is shown for ease of illustration. The base end mounting portion 51 of the damper 5 may be positioned above the swing frame 4 so that the entire damper 5 may be inclined in the left-right direction W.

  The transport cart 1 of this example is devised to monitor a part of the transport cart 1 that is likely to fail. Specifically, the abnormality detecting member 6 is movably provided on the swing frame 4, so that even when an abnormality (failure) occurs in the attachment state of the damper 5 or the support state of the fixed wheel 32, the work can be performed. A person or the like can easily detect this abnormality. As shown in FIG. 4, the abnormality in the transport carriage 1 is, as shown in FIG. 5, when the damper proximal end side abnormality X1 when the proximal end mounting portion 51 of the damper 5 is detached from the front end 201 of the loading platform 2 is removed. In addition, when the tip end portion 52 of the damper 5 is detached from the swinging portion 42 of the swing frame 4 when the tip end side of the damper is abnormal X2, as shown in FIG. 6, the fixed wheel 32 is fixed to the wheel support portion 321. This is assumed as a wheel abnormality time X3, which is when an abnormality occurs in the support state of the wheel portion 322 of the fixed wheel 32.

  Here, when the damper proximal end abnormality X1, the factors that cause the base end mounting portion 51 of the damper 5 to be detached from the front end portion 201 of the loading platform 2 are as follows. Damage to the shaft and welded parts is considered. In addition, when the damper tip end side abnormality X2 is considered, the cause of the disengagement of the tip mounting portion 52 of the damper 5 with respect to the swinging portion 42 of the swinging frame 4 is considered to be damage to bolts, mounting pins, shaft portions, welded portions, and the like. It is done. Further, in the abnormal state X3 of the wheel, the abnormality of the support state of the wheel portion 322 of the fixed wheel 32 by the wheel support portion 321 of the fixed wheel 32 includes the breakage of the shaft portion 323 of the fixed wheel 32, the shaft portion 323 of the fixed wheel 32, The bearing that is in rolling contact may be damaged.

  As shown in FIGS. 1 and 4, the abnormality detection member 6 is rotated in the front-rear direction L at a swing intermediate portion 43 located between the swing base end portion 41 and the swing portion 42 in the swing frame 4. The first abnormality detection member 6A is movably provided, and the second abnormality detection member 6B slides in the front-rear direction L in response to the rotation of the first abnormality detection member 6A. The front end 201 of the loading platform 2 is provided with a display plate 71 that receives the slide of the second abnormality detection member 6B and rotates from the initial position 711 to the display position 712.

As shown in FIGS. 4 and 5, the first abnormality detection member 6 </ b> A is configured to rotate by receiving a force that the damper 5 extends when the damper base end side abnormal time X <b> 1 and the damper front end side abnormal time X <b> 2. ing. In addition, as shown in FIG. 6, the first abnormality detection member 6 </ b> A generates a force by which the wheel portion 322 of the fixed wheel 32 rises relative to the wheel support portion 321 of the fixed wheel 32 during the wheel abnormality X <b> 3. It is configured to receive and rotate.
As shown in FIG. 1, the swinging intermediate portion 43 of the swinging frame 4 is provided with a support portion 44 that rotatably supports the first abnormality detecting member 6A. The first abnormality detecting member 6A includes An attachment fulcrum portion 61 supported by the support portion 44 is provided.

One end of the second abnormality detection member 6B is provided with a rotation fulcrum 68 that is rotatably supported by the first abnormality detection member 6A. The other end of the second abnormality detection member 6B is provided with a display board. A rotation operation unit 62 that comes into contact with 71 is provided. The rotation operation unit 62 is provided with a roller (cam follower).
As shown in FIG. 1, when the display board 71 is at the initial position 711, the display board 71 is in a suspended state due to its own weight. As shown in FIGS. 4, 5, and 6, the display board 71 is pushed forward from the front end 201 of the loading platform 2 by the second abnormality detection member 6 </ b> B at any abnormality X1, X2, and X3. Then, it rotates from the initial position 711 to the display position 712. The display board 71 at the display position 712 is in a substantially horizontal state. Characters such as abnormalities can be written on the surface of the display board 71. When the operator confirms that the display plate 71 is at the display position 712, the operator can detect that an abnormality has occurred in the damper 5 or the fixed wheel 32 and perform maintenance of the transport carriage 1.

As shown in FIGS. 1 and 4, the first abnormality detection member 6A of this example has common detections at the time of three abnormalities, that is, a damper proximal end abnormality X1, a damper distal end abnormality X2, and a wheel abnormality X3. It has a shape to perform. 6 A of 1st abnormality detection members are extended to the front and back of the attachment fulcrum part 61, and the parallel part 601 arrange | positioned in the state close | similar to the damper 5 and the downward direction extended below from the position of the attachment fulcrum part 61 in the parallel part 601 Part 602.
The rotation fulcrum portion 68 of the second abnormality detection member 6B is rotatably connected to the lower end portion of the lower portion 602 of the first abnormality detection member 6A. The second abnormality detection member 6 </ b> B is guided to slide by a roller 25 provided at the front end 201 of the loading platform 2 and a guide 45 provided at the swing frame 4. The slide of the second abnormality detection member 6B can be guided by various structures.

  As shown in FIGS. 4 and 5, the swing frame 4 has a base end side that guides the base end side portion of the damper 5 obliquely upward when the damper 5 extends in the damper base end side abnormal time X1. A guide portion 63 and a tip-side guide portion 64 that guides the tip-side portion of the damper 5 obliquely downward when the damper 5 extends in the damper tip-side abnormal X2 are provided. The base end side guide portion 63 is provided on the base end side portion of the swing frame 4 in a state where the portion of the cylinder 53 as the base end side portion of the damper 5 is sandwiched from the left and right. The front end side guide portion 64 is provided at the front end side portion of the swing frame 4 in a state in which the end portion of the piston rod 54 as the front end side portion of the damper 5 can be pressed obliquely from above.

  The first abnormality detecting member 6A includes a base end side engaging portion 65 that is lifted by a base end side portion of the damper 5 and rotates the abnormality detecting member 6 in the damper base end side abnormal time X1, and a damper. A distal end side engaging portion 66 is provided that is pushed down by the distal end side portion of the damper 5 to rotate the abnormality detecting member 6 when the distal end side abnormality X2 occurs. The proximal end side engaging portion 65 is formed from the parallel portion 601 of the first abnormality detection member 6 </ b> A to above the proximal end side portion of the damper 5. The front end side engaging portion 66 is formed from the parallel portion 601 of the first abnormality detecting member 6A to the lower side of the front end side portion of the damper 5.

  As shown in FIGS. 1, 3, and 6, the swing frame 4 is provided with an abnormality transmission member 72 that rotates when the wheel is abnormal X3. The abnormality transmission member 72 is in contact with a first contact portion 721 that contacts the outer periphery of the wheel portion 322 of the fixed wheel 32 and a second engagement portion 67 that is provided in the lower portion 602 of the first abnormality detection member 6A. A contact portion 722. The first contact portion 721 and the second contact portion 722 are provided with rollers (cam followers). The first contact portion 721 is in rolling contact with the outer periphery of the wheel portion 322 of the fixed wheel 32, and the second contact portion 722. Is in rolling contact with the wheel engaging portion 67.

  The first contact portion 721 is always in contact with the diagonally upper position on the outer periphery of the wheel portion 322 of the fixed wheel 32, and the second contact portion 722 is always in contact with the upper side of the wheel engagement portion 67. The first abnormality detection member 6A is in contact with the abnormality transmission member 72, and the abnormality transmission member 72 is in contact with the fixed wheel 32, so that the rotation posture of the first abnormality detection member 6A is maintained. Further, as shown in FIG. 6, at the time of wheel abnormality X3, the first contact portion 721 is pushed upward by the outer periphery of the wheel portion 322 of the fixed wheel 32 and the second contact portion 722 is engaged with the wheel engagement portion 67. Is pushed downward, the first abnormality detection member 6A rotates, and the first abnormality detection member 6A slides the second abnormality detection member 6B.

Next, the effect of the conveyance cart 1 of this example is demonstrated.
When the transport carriage 1 is moved by towing by the towing vehicle, the free wheel 31 is grounded to the ground and the fixed wheel 32 is grounded. And since the fixed wheel 32 which can rotate only to the front-back direction L is located in the center part of the loading platform 2, when the conveyance trolley 1 bends and moves to the left and right, the fixed wheel 32 of the conveyance trolley 1 is. It can be a starting point when changing posture from side to side. As a result, the transport carriage 1 can bend and move to the left and right with almost no inner ring difference, and the left and right wobbling of the transport carriage 1 can be suppressed as much as possible.

  Further, when the transport carriage 1 towed by the towing vehicle moves on a stepped or uneven ground, any of the free wheels 31 may float from the ground. Even in this case, it is possible to form a state in which the fixed wheel 32 positioned at the center of the loading platform 2 flexibly follows the level difference or unevenness of the ground and is always in contact with the ground. Thereby, the center part of the loading platform 2 is always supported by the fixed wheel 32, and when the transport cart 1 moves, the transport cart 1 is prevented from slipping without the fixed wheel 32 being grounded. be able to.

  Furthermore, the swing frame 4 is disposed from the front end portion 201 of the loading platform 2 to the center portion of the loading platform 2, and the damper 5 is directed obliquely downward in a direction as close as possible to the direction in which the swing frame 4 is disposed. Can be arranged. Thereby, the damper 5 can be accommodated below the upper surface of the loading platform 2, the height of the loading platform 2 can be kept low, and the length of the damper 5 to be used can be increased. Therefore, the range in which the fixed wheel 32 can swing in the vertical direction H can be easily secured.

  Therefore, according to the transport carriage 1 of the present example, the difference between the inner rings can be minimized, and the left-right wobbling during movement can be suppressed, and the posture can be flexibly followed by steps or irregularities on the ground. Can be kept stable.

  Further, in the transport cart 1 of this example, the fixed wheel 32 is provided on the swing frame 4 that can swing by the damper 5, and only the fixed wheel 32 guides the movement of the transport cart 1 in the front-rear direction L. . For this reason, the role of the fixed wheel 32 is important, and when the fixed wheel 32 stops functioning due to a failure, it is necessary to find this failure at an early stage.

  Therefore, by using the abnormality detection member 6 (the first abnormality detection member 6A and the second abnormality detection member 6B), the abnormality transmission member 72, and the display plate 71 for the transport carriage 1, the mounting state of the damper 5 or the fixed wheel 32 Even when an abnormality occurs in the support state, an operator or the like can easily detect this abnormality. As a result, when an abnormality occurs in the mounting state of the damper 5 or the support state of the fixed wheel 32, the operator or the like can detect this abnormality at an early stage, and the conveyance carriage 1 using the damper 5 and the fixed wheel 32 can be detected. Reliability can be improved.

DESCRIPTION OF SYMBOLS 1 Transfer trolley 2 Loading platform 201 Front end part 31 Free wheel 32 Fixed wheel 321 Wheel support part 322 Wheel part 4 Oscillation frame 41 Oscillation base end part 42 Oscillation part 43 Oscillation intermediate part 5 Damper 51 Base end attachment part 52 Tip attachment Part 6 Abnormality detection member 6A First abnormality detection member 6B Second abnormality detection member 61 Mounting fulcrum part 62 Rotating operation part 63 Base end side guide part 64 Front end side guide part 65 Base end side engagement part 66 Front end side engagement part 67 Wheel engagement portion 71 Display plate 711 Initial position 712 Display position 72 Abnormal transmission member 721 First contact portion 722 Second contact portion 8 Conveyed object X1 When the damper proximal end is abnormal X2 When the damper distal end is abnormal X3 When wheel is abnormal L Front-back direction W Left-right direction H Up-down direction

Claims (5)

A transport carriage used for transporting a transported object,
A loading platform on which the transported goods are loaded;
At least three universal wheels provided on the cargo bed so as to be rotatable around a vertical rotation axis;
It is arranged from the end of the cargo bed to the middle region in the front-rear direction and the left-right direction of the cargo bed, and swings with a rocking base end that engages with the edge of the cargo bed as a fulcrum, in the middle region of the cargo bed A swing frame that swings the swing unit positioned in the vertical direction;
A fixed wheel provided on the lower surface of the rocking portion of the rocking frame and having a rotation axis oriented in the left-right direction;
At the end of the loading platform, a base end mounting portion is mounted above the swing base end portion of the swing frame, and the swing frame is disposed obliquely downward from the base end mounting portion. And a damper for biasing the swinging portion of the swinging frame downward using a viscous resistance of a fluid. When the base end side of the damper is abnormal when the base end mounting portion of the damper is detached from the end of the loading platform and is movably provided on the swing frame. When the damper tip side is abnormal when the tip mounting part of the damper is removed, or when the wheel is abnormal when the wheel support part of the fixed wheel is supported by the wheel support part of the fixed wheel. In the above, the damper is extended or the fixed wheel is moved relative to the wheel support part of the fixed wheel, and the damper or the fixed wheel is abnormal. The conveyance cart according to claim 1, further comprising an abnormality detection member for detecting the abnormality. The abnormality detection member includes a first abnormality detection member attached in a swingable manner to a swing intermediate portion located between the swing base end portion and the swing portion in the swing frame; The second abnormality detection member is rotatably connected to the first abnormality detection member, and slides upon receiving the rotation of the first abnormality detection member.
The transport cart according to claim 2, wherein a display plate is provided at an end of the cargo bed, the display plate being rotatable by receiving a slide of the second abnormality detection member. The swing frame includes a base end side guide portion that guides a base end side portion of the damper upward or obliquely upward when the damper extends when the damper base end side is abnormal, and a front end side of the damper A tip side guide portion for guiding the tip side portion of the damper downward or obliquely downward when the damper is extended at the time of abnormality;
The first abnormality detection member includes a base end side engaging portion that is lifted by a base end side portion of the damper and rotates the first abnormality detection member when the damper base end side abnormality occurs, 4. A front end side engaging portion that is pushed down by a front end side portion of the damper and rotates the first abnormality detection member when the front end side of the damper is abnormal is provided. The transport cart described in 1. The swing frame includes an abnormality having a first contact portion that contacts an outer periphery of a wheel portion of the fixed wheel and a second contact portion that contacts a wheel engagement portion provided in the first abnormality detection member. The transmission member is provided in a rotatable state,
The abnormality transmitting member is configured such that, when the wheel is abnormal, the first contact portion is pushed by the outer periphery of the wheel portion of the fixed wheel, and the second contact portion pushes the wheel engaging portion. 5. The transport carriage according to claim 3, wherein the abnormality detection member is configured to rotate.

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