Transport vehicle

Abstract

The utility model provides a conveying vehicle which can convey various objects with universal wheels and is high in universality. A transport vehicle (1) that transports an object having at least two universal wheels is provided with: a pair of side frames (11, 12) that extend forward and backward along both sides of the object (100); a front frame (13) extending between the front ends of the pair of side frames; a central frame (14) extending rearward from the front frame between the pair of side frames; and an arm (30) expanding from the central frame toward the pair of side frames and extending between the two universal wheels, thereby gripping the object.

Description

Technical Field

[0001] This utility model relates to a transport vehicle for transporting objects, such as those with casters. Background Technology

[0002] Patent document 1 describes "a connecting device that automatically connects the unmanned transport vehicle and the unmanned transport vehicle when the unmanned transport vehicle enters the lower part of the transport trolley loaded with goods, so that the unmanned transport vehicle can pull the transport trolley to move, and the connecting device automatically disconnects when the transport trolley reaches the target position."

[0003] Patent Document 1: Japanese Patent Application Publication No. 2010-36644

[0004] However, in the case of the technology described in Patent Document 1, the traction trolley requires a dedicated connecting mechanism and can only be combined with a dedicated trolley originally designed for traction. In addition, the dedicated connecting mechanism is relatively large and requires a certain amount of space, so it cannot be inserted under objects with casters, such as those with very low floors.

[0005] In addition, the conveyor trolley that pulls the trolley needs a lot of space when it is moving and rotating, making it difficult to rotate on narrow roads. Furthermore, it cannot be loaded onto pallets of limited size. Utility Model Content

[0006] This utility model was made in view of the above-mentioned problems. The purpose of this utility model is to provide a highly versatile transport vehicle that can transport a variety of objects with universal wheels.

[0007] The present invention provides a conveyor for transporting objects having at least two casters, which solves the above-mentioned problems. It is characterized by having: a pair of side frames extending forward and backward along both sides of the object; a front frame extending between the front ends of the pair of side frames; a central frame extending rearward from the front frame between the pair of side frames; and an arm extending from the central frame toward the pair of side frames and extending between the two casters, thereby holding the object.

[0008] It has a traveling device, which is located at the center of the pair of side frames and has a drive wheel that is driven to rotate back and forth.

[0009] It has a lifting device, which is located at the center of the front frame, so that the central frame is raised and pressed against the lower surface of the object.

[0010] It has an expansion device for expanding and contracting the arm.

[0011] The rear frame opens and closes between the rear ends of the pair of side frames and the rear end of the central frame.

[0012] The arm has a recess into which the caster is fitted by the expansion.

[0013] In a case where the object has four casters on a bottom surface of the object, the arm has a recess into which the casters are respectively fitted.

[0014] The arm has a recess into which the casters are respectively fitted.

[0015] The central frame has a stopper that is positioned against the object by being inserted between the two casters by being relatively close to the object.

[0016] A transport cart that transports an object having at least two casters, characterized by a pair of side frames that extend forward and backward along both sides of the object, a front frame that extends between the front ends of the pair of side frames, a central frame that extends between the pair of side frames from the front frame toward the rear, and an arm that expands from the pair of side frames toward the central frame to concentrate the two casters integrally into the object, thereby holding the object.

[0017] Effects of the utility model are as follows.

[0018] According to the utility model, a transport cart that can transport various objects with casters and has high versatility can be provided.

[0019] Further features associated with the utility model are clarified by the description and drawings of the present specification. In addition, the above-mentioned problems, structures, and effects are clarified by the following description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a whole view of the transport cart of the first embodiment.

[0021] Figure 2 is a whole view of the transport cart of the first embodiment.

[0022] Figure 3 is a view that explains the structure of the arm and the expansion / contraction device in the first embodiment.

[0023] Figure 4 is a view that explains the structure of the arm and the expansion / contraction device in the first embodiment.

[0024] Figure 5 is a view that shows the structure of the lifting device that the transport device of the first embodiment has.

[0025] Figure 6 is a view showing a state of use of the conveyance device of the first embodiment.

[0026] Figure 7 is a view showing an object conveyed by the conveyance device of the first embodiment from the bottom surface side.

[0027] Figure 8 is a view showing a state of gripping of the object by the conveyance device of the first embodiment from the bottom surface side.

[0028] Figure 9 is a view showing the entire conveyance cart of the second embodiment.

[0029] Figure 10 is a view showing the entire conveyance cart of the second embodiment.

[0030] Figure 11 is a view showing the structure of the arm and the expansion / contraction device in the second embodiment.

[0031] Figure 12 is a view showing the structure of the arm and the expansion / contraction device in the second embodiment.

[0032] Figure 13 is a view showing the structure of the lifting device possessed by the conveyance device of the second embodiment.

[0033] Figure 14 is a view showing a state of gripping of the object by the conveyance device of the second embodiment from the bottom surface side.

[0034] In the figure: 1 - conveyance cart, 10 - frame, 11 - right side frame (side frame), 12 - left side frame (side frame), 13 - front frame, 14 - central frame, 15A, 15B - rear frame, 20A, 20B - traveling device, 21 - drive wheel, 30, 50 - arm, 31, 51 - link mechanism, 32, 52 - linear actuator (expansion device), 33A, 33B - flat plate, 34, 35, 54 - recess, 40 - lifting device, 56A, 56B - stopper. DETAILED DESCRIPTION

[0035] <First Embodiment>

[0036] Next, the first embodiment of the present application will be described.

[0037] Figure 1 and Figure 2 is a view showing the entire conveyance cart of the first embodiment, Figure 1 indicates a state when the object is gripped, Figure 2 indicates a state before the object is gripped.

[0038] The transport vehicle 1 is a device that holds and transports an object 100 with multiple casters on its bottom surface. For example, it has the function of transporting the object to the target location by moving within a facility such as a factory or warehouse according to a pre-set program.

[0039] The conveyor 1 has a frame 10, traveling devices 20A and 20B, an arm 30, a lifting device 40, and a control device 60. The frame 10 has a frame structure that is generally rectangular when viewed from above, and includes: a pair of left and right side frames 11 and 12 extending forward and backward; a front frame 13 extending left and right between the front ends of the pair of side frames 11 and 12; a central frame 14 extending rearward from the front frame 13 between the pair of side frames 11 and 12; and rear frames 15A and 15B that open and close between the rear ends of the pair of side frames 11 and 12 and the rear end of the central frame 14.

[0040] A pair of side frames 11, 12 have along the object 100 (refer to) Figure 5 The length extending to both sides of the object 100. Traveling devices 20A and 20B are provided on each side frame 11 and 12. Traveling devices 20A and 20B have drive wheels 21 that are driven to rotate back and forth, a drive motor 22, and a gearbox 23. Each drive wheel 21 is arranged such that its central axis extends coaxially to the left and right sides of the side frames 11 and 12, and is positioned at the center of the long side of the side frames 11 and 12 with its rotation center located approximately at the center of the lower surface 101 of the object 100.

[0041] The base ends of the rear frames 15A and 15B are pivotally supported at the rear ends of a pair of side frames 11 and 12, allowing the front ends to swing towards or away from the central frame 14 to open and close the rear portion of the frame 10. The rear frames 15A and 15B can be selectively configured as follows: Figure 1 As shown, the front ends of the rear frames 15A and 15B are locked to the rear end of the central frame 14, and the rear ends of the pair of side frames 11 and 12 are closed to the rear end of the central frame 14 in a closed position. Figure 2 As shown, the locking mechanism is released, opening the rear ends of the pair of side frames 11, 12 and the rear end of the central frame 14 to an open position.

[0042] The central frame 14 has a flat plate shape with a predetermined thickness so that it can be inserted between the floor surface of the transport object 100 and the lower surface 101 of the object 100. The central frame 14 is mounted to the front frame 13 at the center of its long side, separated by the lifting device 40.

[0043] Figure 3 and Figure 4 This is a diagram illustrating the structure of the arm and the deployment device in the first embodiment. Figure 3 This indicates the extended or unfolded state of the arm.Figure 4 This indicates the retracted state of the arm.

[0044] An arm 30 is provided in the central frame 14. The arm 30 has a structure that expands symmetrically toward a pair of side frames 11, 12 and extends between at least two casters 102A, 102B of the object 100, thereby holding the object 100 in place. In this embodiment, it is configured to extend between casters 102A and 102B and between casters 103A and 103B, respectively, thereby holding the object 100 in place.

[0045] Arm 30 has a pair of flat plates 33A and 33B arranged separately on the left and right sides, and a linkage mechanism 31 that supports the pair of flat plates 33A and 33B so that they can contact and separate. The linkage mechanism 31 is supported by the central frame 14 and has a structure that can expand and retract to the left and right. The linkage mechanism 31 is formed by intersecting multiple flat rod members and rotatably connecting them with pins.

[0046] The linkage mechanism 31 can expand and unfold to allow a pair of flat plates 33A and 33B to protrude laterally from the central frame 14. Furthermore, the linkage mechanism 31 can retract to bring the pair of flat plates 33A and 33B closer together and store them within the central frame 14. A linear actuator (expansion device) 32 for driving the linkage mechanism 31 is provided in the central frame 14. The linear actuator 32 can cause the linkage mechanism 31 to expand and unfold, pressing the pair of flat plates 33A and 33B against the casters 102A and 102B and the casters 103A and 103B with a predetermined pushing force.

[0047] Recesses 34 and 35 are provided on the outer edges of a pair of flat plates 33A and 33B, which are expanded by a linkage mechanism 31 to accommodate casters 102A, 102B and 103A, 103B. The front recess 34 has a semi-circular shape. The rear recess 35 has a semi-elliptical shape extending longitudinally. The position and spacing of the casters of the object 100 vary depending on the type of object 100; therefore, the rear recess 35 is designed as a semi-elliptical shape to accommodate various spacings.

[0048] Figure 5 This is a diagram showing the structure of the lifting device included in the conveying device of the first embodiment.

[0049] The lifting device 40 is interposed between the front frame 13 and the central frame 14, and has a configuration that lifts the central frame 14 with respect to the front frame 13. The lifting device 40 is a device that presses the drive wheels 21 against the floor surface in order to ensure sufficient floor surface friction required for movement of the transport cart 1. The lifting device 40 lifts the central frame 14 to press it against the lower surface 101 of the object 100, applies a force in a direction to lift the object 100, and presses the drive wheels 21 against the floor surface by a reaction force thereof, thereby improving the grip of the drive wheels 21.

[0050] The lifting device 40 has a base plate 46 fixed to the front frame 13, a sliding plate 41 supported so as to be movable up and down with respect to the base plate 46, a telescopic jack 44 fixed to the front frame 13, and a rotation motor 45 that rotates a screw of the telescopic jack 44.

[0051] An upper plate 43 is provided at an upper end of the sliding plate 41, is bent toward the front, and is disposed in opposition to an upper portion of the telescopic jack 44, and a lower plate 42 is provided at a lower end of the sliding plate 41, is bent toward the rear, and is connected to the central frame 14.

[0052] The lifting device 40 rotates the screw of the telescopic jack 44 by rotational drive of the rotation motor 45, and lifts the upper plate 43 upward by the telescopic jack 44, and accordingly, is capable of integrally moving the sliding plate 41 and the lower plate 42 upward, and lifting the central frame 14. Also, is capable of pressing the central frame 14 against the lower surface 101 of the object 100, and applying a force in a direction to lift the object 100.

[0053] The control device 60 controls the drive motors 22 of the traveling devices 20A, 20B, the rotation motor 45 of the lifting device 40, and the linear actuators 32 that expand and contract the arms 30, based on detection signals from sensors not shown. The control device 60 is constituted by an electronic control device having a CPU, a memory, and the like, and controls each portion, for example, by executing a program set in advance.

[0054] Figure 6 is a view showing a use state of the transport device of the first embodiment, Figure 7 is a view showing an object transported by the transport device of the first embodiment from a floor surface side, Figure 8 is a view showing a state of gripping of the object by the transport device of the first embodiment from a floor surface side.

[0055] The object 100 is, for example, an extremely low floor type wheeled object such as an inspection device, and the like, having a size and weight that one or more workers can press by hand to move. The object 100 has no towing fittings, and the side surfaces are decorative panels. As shown in FIG. 1, the object 100 is a wheeled object having a size and weight that one or more workers can press by hand to move. Figure 7As shown, the object 100 has a plurality of casters 102A, 102B, 103A, 103B, 104A, 104B, 105A, 105B and fixed legs 106A, 106B, 107A, 107B on the lower surface 101. These plurality of casters 102A, 102B, 103A, 103B, 104A, 104B, 105A, 105B are used when the transport cart 1 is being transported.

[0056] The fixed legs 106A, 106B, 107A, 107B are used when the object 100 is being fixed, and are retracted to a recessed position compared to the casters by screw adjustment when being moved. Also, after being transported to a desired fixed location, they are made to protrude more than the casters by screw adjustment, thereby fixing the object to the floor surface. The casters 102A, 102B, 103A, 103B, 104A, 104B, 105A, 105B are freely rotatable wheels, and as shown, Figure 8 As shown, the casters 102A, 102B, 103A, 103B have a configuration that enables them to freely rotate even in a state where the pair of plates 33A, 33B of the arm 30 are pushed in and embedded in the recesses 34, 35 and are holding the object to be combined.

[0057] In order for the transport cart 1 to hold the object 100, as shown, Figure 2 As shown, the arm 30 is housed within the central frame 14, and the rear frames 15A, 15B are disposed in the open position. Then, the transport cart 1 is brought relatively close to the object 100, and the central frame 14 is made to sink between the floor surface and the lower surface 101 of the object 100, and the central frame 14 is inserted between the casters 102A and 102B and between the casters 103A and 103B.

[0058] Also, as shown, Figure 8 The arm 30 is made to expand from the central frame 14 toward the pair of side frames 11, 12 and to protrude between the casters 102A and 102B and between the casters 103A and 103B, thereby holding the object 100 to be combined. By the expansion of the arm 30, the casters 102A, 102B, 103A, 103B are embedded in the recesses 34, 35 of the plates 33A, 33B. Also, the rear frames 15A and 15B are disposed in the closed position. Thereby, as shown, Figure 6 As shown, the object 100 is held by the transport cart 1 to be combined and becomes a state where it can be moved integrally.

[0059] Then, from this state, the central frame 14 is lifted by the lifting device 40 and is pressed against the lower surface of the object 100, and a reaction force that presses the drive wheels 21 against the floor surface is generated, and sufficient floor surface friction of the drive wheels 21 required for movement is ensured. The movement of the transport cart 1 is performed by controlling the traveling devices 20A and 20B.

[0060] When separating the object 100 from the transport cart 1, the arms 30 are retracted in the state of stopping to be housed in the central frame 14, and the extension between the universal wheels 102A and 102B and between the universal wheels 103A and 103B is released. Then, the rear frames 15A and 15B are arranged at the open position, and the transport cart 1 is moved in the direction of relatively distancing from the object 100 to separate it.

[0061] Next, the effects of the transport cart 1 of the present embodiment are described.

[0062] The transport cart 1 expands the arms 30 from the central frame 14 toward the pair of side frames 11 and 12 and extends between the universal wheels 102A and 102B and between the universal wheels 103A and 103B, thereby holding the object 100 to be combined. Therefore, various sizes of the object 100 that differ in the interval of the left and right universal wheels 102A and 102B or 103A and 103B can be held in correspondence.

[0063] The transport cart 1 holds the object 100 to be combined by embedding the universal wheels 102A, 102B, 103A, and 103B in the recesses 34 and 35 of the pair of plates 33A and 33B. Therefore, it is not necessary to install a dedicated coupling mechanism to the object 100, and the object 100 itself can be reliably held. Further, the recess 35 has a semi-elliptical shape that extends in the long axis direction from front to back, and thus various sizes of the object 100 that differ in the interval in the front-back direction between the universal wheels 102A, 102B, and 103A, 103B can be held in correspondence.

[0064] The transport cart 1 has the lifting device 40 that presses the drive wheels 21 against the floor surface. Therefore, sufficient floor surface friction required for the movement of the transport cart 1 can be ensured, and in particular, tire slip that can occur when transporting heavy objects can be prevented in the lightweight transport cart 1 using a slope or the like.

[0065] The transport cart 1 has a structure in which the drive wheels 21 are arranged at the central positions in the long direction of the side frames 11 and 12 with the rotation center located at substantially the center of the lower surface 101 of the object 100 to be combined, and thus the occupied space due to movement can be reduced, and the travel in facilities in which narrow roads are many, such as factories and warehouses, can be facilitated.

[0066] The transport cart 1 has a structure in which the rear frames 15A and 15B are combined with the rear ends of the central frame 14 to close the open ends. Therefore, it has high rigidity, and high travel stability can be obtained.

[0067] The transport cart 1 can hold and transport the object 100 in combination, and can reduce rigidity compared to a cart on which the object 100 is placed and transported, and can be miniaturized and lightened. Therefore, the transport cart 1 can be provided, for example, in a size that falls within the size of a pallet for a vertical lift for floor movement, and can be controlled to a weight within a transportable weight.

[0068] The central frame 14 of the transport cart 1 has a flat plate shape, and the flat plates 33A, 33B of the arms 30 and the link mechanism 31 also have a structure that can be accommodated in the central frame 14 with a small thickness, and therefore even if the lower surface 101 of the object 100 is an extremely low floor with a low height from the floor surface, the central frame 14 can be inserted between the lower surface 101 of the object 100 and the floor surface.

[0069] Note that in the above embodiment, a structure in which the arms 30 expand and deploy bilaterally symmetrically from the central frame 14 toward the pair of side frames 11, 12 to hold and combine the object 100 is described, but the structure of the present application is not limited to the above structure. For example, a configuration in which the arms 30 are accommodated in the side frames 11, 12 on both sides, and are held by expanding the arms inward from each side frame can also be used. More specifically, the arms can expand and deploy from the pair of side frames 11, 12 toward the central frame 14, sandwich the at least two casters 102A, 102B of the object 100 integrally, and hold and combine the object 100.

[0070] <Second Embodiment>

[0071] Next, a second embodiment of the present application will be described.

[0072] Note that the same reference numerals are used for the same components as in the first embodiment, and detailed descriptions thereof will be omitted.

[0073] Figure 9 Fig. 1 is a perspective view of a transport cart according to a second embodiment of the present application, Figure 10 Fig. 1 is a perspective view of a transport cart according to a second embodiment of the present application, Figure 11 Fig. 1 is a perspective view of a transport cart according to a second embodiment of the present application, Figure 12 Fig. 1 is a perspective view of a transport cart according to a second embodiment of the present application, Figure 13 Fig. 1 is a perspective view of a transport cart according to a second embodiment of the present application, Figure 14 Fig. 1 is a perspective view of a transport cart according to a second embodiment of the present application.

[0074] The present embodiment is characterized by a structure in which the length of the arms is shortened to achieve light weight, and the arms are expanded and deployed between the two casters 102A, 102B to hold and combine the object.

[0075] An arm 50 is provided to the central frame 14. The arm 50 is configured to expand symmetrically left and right toward the pair of side frames 11, 12 to project between the two casters 102A, 102B of the object 100, thereby holding the object 100 to be coupled.

[0076] The arm 50 has a pair of flat plates 53A, 53B arranged apart left and right and a link mechanism 51 supporting the pair of flat plates 53A, 53B so as to be able to contact and separate from each other. The link mechanism 51 is supported to the central frame 14 and has a structure capable of expanding and retracting left and right. The link mechanism 51 is configured by crossing a plurality of bar members in a flat plate shape and pivotably pin-coupling them.

[0077] The link mechanism 51 is capable of projecting the pair of flat plates 53A, 53B left and right from the central frame 14 by expanding and expanding. Also, the link mechanism 51 is capable of storing the pair of flat plates 53A, 53B in the central frame 14 by retraction so as to approach each other. A linear actuator (expansion device) 52 that drives the link mechanism 51 is provided to the central frame 14. As shown, for example, the linear actuator 52 is capable of expanding and expanding the link mechanism 51 to push the pair of flat plates 53A, 53B against the casters 102A, 102B with a predetermined pressing force. Figure 14

[0078] A recess 54 into which the casters 102A, 102B are inserted by expansion and expansion of the link mechanism 51 is provided to the outer end edge of the pair of flat plates 53A, 53B. The recess 54 has a semicircular shape.

[0079] Positioning stops 56A, 56B are provided to the base end of the central frame 14. When the central frame 14 is inserted between the lower surface 101 of the object 100 and the floor surface, the positioning stops 56A, 56B abut against the casters 104A, 104B of the object 100, and the object 100 is positioned with respect to the front and rear directions of the transport cart 1.

[0080] Also, a pair of auxiliary wheels 24 is provided to the front frame 13. The auxiliary wheels 24 are capable of assisting stable travel of the transport cart 1, and, when the object 100 is not held and coupled, the auxiliary wheels 24 are capable of stabilizing the posture state of the frame 10. The auxiliary wheels 24 are supported so as to be movable in the vertical direction and are urged downward by a spring. The auxiliary wheels 24 have the effect of absorbing displacement that occurs when a step or a slope on the floor surface is crossed in a state in which the object 100 is held and coupled.

[0081] ​The lifting device 40 has a sliding upper member 411 supported on the bottom plate 46 of the front frame 13 so as to be movable up and down via a first linear guide 412. The sliding upper member 411 has a substantially T-shaped shape in plan view, with a front end portion 411a projecting in a direction intersecting the front frame 13 in an upward direction of the front frame 13, and a base end portion 411b extending from one end of the front end portion 411a toward the side frames 11 in mutually diverging directions. A telescopic jack 44 is arranged between the front end portion 411a and the front frame 13, and the sliding upper member 411 is movable up and down relative to the front frame 13 by extension and contraction of the telescopic jack 44.

[0082] The base end portion 411b of the sliding upper member 411 is supported on a sliding plate 414 so as to be movable up and down via a second linear guide 413. A lower plate 42 projecting toward the rear and connected to the central frame 14 is provided at a lower end of the sliding plate 414. The sliding plate 414 is sandwiched between the sliding upper member 411 with a compression spring 416 interposed therebetween, and is urged upward in a manner approaching the sliding upper member 411.

[0083] The compression spring 416 adjusts the force with which the central frame 14 is urged against the bottom surface of the object 100. In the case where the transport cart 1 travels over a step or slope in the floor surface in a state in which the object 100 is held in combination, the compression spring 416 can absorb displacement between the wheels resulting from the positional relationship between the universal wheels 102A, 102B, 103A, 103B of the object 100 and the drive wheels 21 of the transport cart 1.

[0084] For example, in combination with holding of the object 100, the sliding upper member 411 is raised using the telescopic jack 44 to urge the central frame 14 against the bottom surface of the object 100. Then, the sliding upper member 411 is relatively moved upward by further raising to compress the compression spring 416. Then, the sliding position is adjusted in a manner in which the displacement of the compression spring 416 becomes a central position of spring elongation, and is set in a state in which the object 100 is supported in a manner movable up and down with a cushion.

[0085] Thus, when the transport cart 1 passes over a step in the floor surface, displacement between the drive wheels 21 of the transport cart 1 and the universal wheels 102A, 102B, 103A, 103B of the object 100 can be absorbed by extension and contraction of the compression spring 416. Also, sufficient pressing force of the object 100 against the central frame 14 can be ensured, and prevention of slippage of the drive wheels 21 and prevention of damage to the transport cart 1 due to excessive load can be achieved.

[0086] The embodiments of the present application have been described in detail above, but the present application is not limited to the above-described embodiments, and various design changes can be made within the scope of the technical concept of the present application as recited in the scope of the claims. For example, the above-described embodiments are described in detail for the purpose of facilitating understanding of the present application, and are not limited to necessarily having all the structures described. In addition, a part of the structure of one embodiment can be replaced with the structure of another embodiment, and in addition, the structure of one embodiment can be added with the structure of another embodiment. Furthermore, regarding a part of the structure of each embodiment, addition, deletion, and replacement of other structures can be made.

Claims

1. A transport cart that transports an object having at least two caster wheels, characterized by comprising: a pair of side frames that extend forward and backward along both sides of the object; a front frame that extends between the front ends of the pair of side frames; a center frame that extends between the pair of side frames from the front frame toward the rear; and an arm that expands from the center frame toward the pair of side frames and protrudes between the two caster wheels, thereby holding the object.

2. The transport cart according to claim 1, characterized by comprising a traveling device that is provided at a central position of the pair of side frames and has drive wheels that are driven to rotate forward and backward.

3. The transport cart according to claim 1, characterized by comprising a lifting device that is provided at a central position of the front frame and lifts the center frame to press it against the lower surface of the object.

4. The transport cart according to claim 1, characterized by comprising a deployment device that expands and contracts the arm.

5. The transport cart according to claim 1, characterized by comprising a rear frame that opens and closes between the rear ends of the pair of side frames and the rear end of the center frame.

6. The transport cart according to claim 1, characterized in that the arm has a recess into which the caster wheels are fitted by the expansion.

7. The transport cart according to claim 6, characterized in that, in the case where the object has four caster wheels on the bottom surface of the object, the arm has a recess into which the caster wheels are respectively fitted one by one.

8. The transport cart according to claim 7, characterized in that the arm has a recess into which the caster wheels are respectively fitted two by two.

9. The transport cart according to claim 1, characterized in that the center frame has a stopper that is positioned in abutment with the object by being inserted between the two caster wheels by being relatively close to the object.

10. A transport cart that transports an object having at least two caster wheels, characterized by comprising: a pair of side frames that extend forward and backward along both sides of the object; a front frame that extends between the front ends of the pair of side frames; a center frame that extends between the pair of side frames from the front frame toward the rear; and an arm that expands from the pair of side frames toward the center frame to sandwich the two caster wheels integrally, thereby holding the object. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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