Cart

Abstract

To provide a cart capable of being constructed through ready assembly work.SOLUTION: A cart 1 includes a caster 21, a frame 22 disposed above the caster 21, and a tabular cover 23 which is disposed above the frame 22 and on which a baggage can be placed. The cart 1 includes pieces of restriction means 224c 232c, 232d, 233c, and 233d that restrict movement in a horizontal direction of the caster 21 with respect to the cover 23. The caster 21 is secured to the cover 23 in such a condition that the movement in the horizontal direction is restricted by the pieces of restriction means 224c, 232c, 232d, 233c, and 233d and the caster abuts on the lower part of the frame 22.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a cart for transporting articles. [Background technology]

[0002] For example, in supermarkets, convenience stores, and other stores, carts are used to transport and stock products stored in the backroom. Some products are heavy, and high load-bearing capacity is required.

[0003] For example, the bogie shown in Patent Document 1 includes a bogie frame that is rectangular in plan view, a checkered steel plate fixed to the upper part of the bogie frame, and casters fixed to the four corners of the lower part of the bogie frame. The load-bearing capacity of this bogie is ensured by the highly rigid bogie frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-67965 A (page 2, Figure 1) Summary of the Invention [Problem to be solved by the invention]

[0005] However, with a bogie such as that described in Patent Document 1, assembly requires a process of fixing the casters to the bogie frame with bolts or the like, and a process of fixing the checkered steel plate with bolts or the like, which requires a large number of assembly steps and makes the assembly work complicated.

[0006] The present invention has been made in view of these problems, and has as its object to provide a carriage that can be easily assembled. [Means for solving the problem]

[0007] In order to solve the above problem, the bogie of the present invention comprises: A dolly comprising casters, a frame disposed above the casters, and a plate-shaped cover disposed above the frame on which luggage can be placed, The dolly includes a restricting means for restricting horizontal movement of the caster relative to the cover, The caster is characterized in that it is fixed to the cover in a state where its horizontal movement is restricted by the restricting means and it is in contact with the lower part of the frame. According to this feature, the frame, casters, and cover are integrated by sandwiching the frame between the cover and casters and then fastening the casters to the cover, which simplifies assembly work. In addition, the casters' horizontal movement relative to the cover is restricted by the restricting means, so the casters can be fastened to the cover with fewer steps, such as tightening bolts.

[0008] A seat portion is provided on the upper portion of the caster, spanning the frame from front to back or left to right, The cover is characterized in that a seat receiving portion is provided on the lower surface thereof to come into contact with the upper surface of the seat portion. According to this feature, the caster seat abuts against both the frame and the seat receiving portion of the cover, making it easy to accurately attach the caster to the cover.

[0009] The seat portion has a rectangular shape in a plan view, The regulating means is characterized by having at least one of front and rear contact portions that contact the front and rear surfaces of the seat portion, and left and right contact portions that contact the left and right surfaces of the seat portion. This feature allows the movement of the caster relative to the cover in the forward / backward or left / right directions and in the rotational direction to be restricted.

[0010] The restricting means has a lower surface contact portion that contacts the lower surface of the seat portion. According to this feature, the movement of the caster in the direction away from the cover can be restricted by the lower surface contact portion that contacts the underside of the seat portion.

[0011] The restricting means has a portion that extends from the cover downwardly beyond the frame. According to this feature, since the restricting means is provided on the cover side, it is easy to maintain the relative position between the caster and the cover.

[0012] The restricting means further has a portion extending downward from the frame. According to this feature, the casters are restricted in movement by the portions provided on the cover side and the portions provided on the frame side, making it easier to maintain the relative positions of the frame, casters, and cover.

[0013] The cover is made up of a plurality of divided bodies, The casters are characterized in that they are fixed to each of the divided bodies, straddling the divided bodies. According to this feature, the separate bodies are connected by the casters, which simplifies the assembly process.

[0014] The divided bodies are characterized by having protruding pieces extending across adjacent divided bodies. According to this feature, the protruding piece of each divided body is arranged across the adjacent divided body, so that the strength of the joint between the divided bodies can be increased. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a carriage according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Figure 5] FIG. 2 is a perspective view of wheels disposed at the four corners of the vehicle body, as viewed from below. [Figure 6] FIG. 6 is an exploded perspective view of FIG. 5. [Figure 7] FIG. 2 is a perspective view of a wheel disposed in the center of the vehicle body as viewed from below. [Figure 8] FIG. 8 is an exploded perspective view of FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of a bogie according to the present invention based on an embodiment. [Example]

[0017] A dolly according to an embodiment will be described with reference to Fig. 1 to Fig. 8. In the following description, the upper side of Fig. 3 is the front side (forward side) of the dolly, the right side of Fig. 3 is the right side of the dolly, and the left side of the dolly is the left side of the dolly.

[0018] The cart 1 according to the present invention is used, for example, to transport merchandise between the back yard and the sales floor of a supermarket, convenience store, or the like.

[0019] As shown in FIG. 1, the cart 1 is mainly composed of a car body 20, a pair of left and right side frames 30, 30, and two shelves 40, 40 serving as article holding members.

[0020] The side frames 30, 30 rise upward from both the left and right ends of the vehicle body 20. Each side frame 30 includes a pair of front and rear support pillars 31, 31, an upper connecting rod 32 and a lower connecting rod 33 that connect the upper and lower ends of the pair of support pillars 31, 31, and two upper and lower brackets 34, 34 that connect the pair of support pillars 31, 31 between the upper connecting rod 32 and the lower connecting rod 33.

[0021] Opposing surfaces 31a, 31a of the pair of support columns 31, 31 facing each other in the front and rear thereof are provided with a plurality of locking holes 31b, 31b, . . . , 31b, 31b, . . . in the vertical direction.

[0022] The bracket 34 has locking pieces at both the front and rear ends that can be locked into the locking holes 31b, 31b, and the height position at which the bracket 34 is installed can be changed by selecting the desired locking holes 31b, 31b.

[0023] The shelf board 40 is disposed between the pair of left and right brackets 34, 34. Articles can be placed on this shelf board 40. In addition to the shelf board 40, another article holding member such as a basket may be attached to the bracket 34.

[0024] As shown in Figures 2 and 3, the vehicle body 20 has a plurality of casters 21, 21, ... (five in this embodiment), a frame 22 arranged above the casters 21, 21, ..., and a plate-shaped cover 23 arranged above the frame 22 and on which items can be placed.

[0025] The cover 23 is composed of two resin divided bodies 23A and 23B. The divided bodies 23A and 23B are generally rectangular in top view. A plurality of protruding pieces 23Ab and 23Bb (see FIGS. 4 and 8) are provided in the front-rear direction at the opposing portions of the divided bodies 23A and 23B.

[0026] Specifically, as shown in Fig. 4, the protruding pieces 23Ab, 23Bb of each segment 23A, 23B protrude stepwise downward from the underside of the mounting surface 23Ac, 23Bc of the segment 23A, 23B toward the opposing segment 23A, 23B, and are arranged in a staggered manner. By combining the protruding pieces 23Ab, 23Bb in a staggered manner, the opposing surfaces 23Aa, 23Ba of the mounting surface 23Ac, 23Bc are brought into contact with each other, so that the protruding pieces 23Ab, 23Bb are arranged along the underside of the opposing mounting surface 23Ac, 23Bc. This prevents the segments 23A, 23B from bending in a mountain-like shape when viewed from the front or from shifting relative to each other in the front-to-back direction.

[0027] 3, ribs 24 are provided on the lower surfaces of the mounting surfaces 23Ac and 23Bc to reinforce the strength of the divided bodies 23A and 23B. The ribs 24 have a plurality of first ribs 241 extending in the front-rear direction and a plurality of second ribs 242 extending in the left-right direction, forming a lattice pattern.

[0028] The first rib 241 has a plurality of downward U-shaped recesses 241a that sandwich a front rod member 221 and a rear rod member 222 of the frame 22 (described later) from the front and rear sides (see FIG. 6).

[0029] 2, 3, and 6, the frame 22 includes a metal front rod member 221 and a metal rear rod member 222 that extend in the left-right direction and are arranged substantially parallel to each other with a space between them in the front-rear direction, and a plurality of metal connecting rod members 223, 223′, 223 (three in this embodiment) that connect the front rod member 221 and the rear rod member 222 in the front-rear direction. Note that the front rod member 221, the rear rod member 222, and the connecting rod member 223 are not limited to being made of metal as long as they are more rigid than the cover 23.

[0030] The casters 21 are arranged at the four corners of the lower part of the vehicle body 20 and at the center of the lower part of the vehicle body 20.

[0031] The caster 21 has a seat portion 211 that is a generally rectangular plate-like shape in a plan view, and a wheel 212 that is attached to the lower part of the seat portion 211 so as to be rotatable in the horizontal direction and to be able to roll.

[0032] The wheels 212 are attached to the center of the seat 211. The seat 211 has through holes 211a formed at its four corners, which penetrate vertically.

[0033] Each caster 21 attached to the four corners of the lower part of the car body 20 is provided with a locking mechanism 213 that can restrict and release the rolling of the wheel 212.

[0034] The casters 21 attached to the four lower corners of the vehicle body 20 are arranged near the connection parts of the frame 22 between the front rod member 221 and the left and right connecting rod members 223, and near the connection parts of the rear rod member 222 and the left and right connecting rod members 223.

[0035] The caster 21' attached to the center of the lower part of the vehicle body 20 is disposed near the front-rear center of the connecting rod member 223' located in the middle of the left and right sides. Note that the caster 21' is not provided with a locking mechanism 213.

[0036] These casters 21, 21' are fixed to the cover 23 in a state where the frame 22 is sandwiched between the casters 21 and the cover 23.

[0037] Next, a specific description will be given of the installation state of the casters 21 attached to the four corners of the lower part of the car body 20. Note that, here, the installation state of the caster 21 attached to the front right of the car body 20 will be described as an example.

[0038] As shown in Figures 5 and 6, the cover 23 is provided with a protrusion 231 extending in the front-to-rear direction, and seat receiving portions 232, 233 provided on both left and right sides of the front end of the protrusion 231, sandwiching the protrusion 231 therebetween.

[0039] The protruding portion 231 has a cylindrical shape with a bottom and is generally rectangular when viewed from below, and the connecting rod member 223 is disposed on the protruding portion 231 .

[0040] The left seat receiving portion 232 is generally cross-shaped when viewed from below. Specifically, it includes a flat first piece 232a that extends forward and backward, and a flat second piece 232b that extends left and right and intersects with the first piece 232a.

[0041] A protrusion 232c that protrudes downward is provided at the rear end of the first piece 232a, and a protrusion 232d that protrudes downward is provided at the left end of the second piece 232b.

[0042] The right seat receiving portion 233 is generally cross-shaped when viewed from below. Specifically, it includes a flat first piece 233a extending in the front-to-rear direction, a flat second piece 233b extending in the left-to-right direction and intersecting with the first piece 233a, and a cylindrical portion 233e that is provided at the intersection of the first piece 233a and the second piece 233b and extends in the up-down direction.

[0043] The rear end of the first piece 233a is provided with a protrusion 233c that protrudes downward. The right end of the second piece 233b is provided with a protrusion 233d that protrudes downward. The cylindrical portion 233e is provided with a through-hole through which a bolt 5 (described later) can be inserted.

[0044] The connecting rod member 223 has a generally upward U-shape in cross section, and is fitted from below onto the protruding strip portion 231. This restricts movement of the connecting rod member 223 relative to the cover 23 in the left-right direction.

[0045] The front rod member 221 is a hollow, tubular member that is generally rectangular in cross section. A plate 224 that is generally U-shaped facing upward in side view is attached to the front surface of the front rod member 221 and protrudes downward from the front rod member 221. The plate 224 includes a back plate portion 224a, lower plate portions 224b, 224b provided on the left and right, and a front plate portion 224c.

[0046] An insertion opening 224d is formed at the lower end of the back plate portion 224a of the plate 224, into which the front end of the seat portion 211 of the caster 21 can be inserted. More specifically, the insertion opening 224d is provided near the connection point between the back plate portion 224a and the left and right lower plate portions 224b, 224b, and is formed by a slit between the back plate portion 224a and the left and right lower plate portions 224b, 224b. The front plate portion 224c of the plate 224 extends downward to a position overlapping the front of the insertion opening 224d.

[0047] The caster 21 is disposed across the left and right seat receiving portions 232, 233 by inserting the front end of the seat portion 211 into the insertion port 224d from diagonally downward and then abutting the upper surface of the seat portion 211 against the left and right seat receiving portions 232, 233. In this state, the bolt 5 is inserted from below the cover 23 into the through hole 211a of the seat portion 211 and the cylindrical portion 233e, and fastened to a nut (not shown) embedded in the upper surface side of the cover 23, thereby fixing the caster 21 to the cover 23.

[0048] The lower surfaces of the left and right seat receiving portions 232, 233, that is, the lower surfaces of the first pieces 232a, 233a and second pieces 232b, 233b, are designed to be at the same height as the lower surfaces of the front rod member 221 and connecting rod member 223 installed on the cover .

[0049] Therefore, when the caster 21 is fixed to the cover 23 , the upper surface of the seat portion 211 abuts against the lower surfaces of the seat receiving portions 232 and 233 , the lower surface of the front rod member 221 , and the lower surface of the connecting rod member 223 .

[0050] Furthermore, the protrusions 232c and 233c abut against the rear surface 211b of the seat 211 of the caster 21, and the front plate 224c of the plate 224 abuts against the front surface 211c of the seat 211 of the caster 21. Furthermore, the right surface of the protrusion 232d abuts against the left surface 211d of the seat 211 of the caster 21, and the left surface of the protrusion 233d abuts against the right surface 211e of the seat 211 of the caster 21.

[0051] This allows the caster 21 to be properly positioned while restricting its movement in the front-to-back, left-to-right, and rotational directions relative to the cover 23. In other words, the protrusions 232c, 233c, the protrusions 232d, 233d, and the front panel 224c of the plate 224 function as restricting means for restricting the movement of the caster 21 in the horizontal direction.

[0052] In this way, the casters 21 and the cover 23 sandwich the frame 22 (front rod member 221 and connecting rod member 223) from above and below, and the casters 21 are fixed to the cover 23, thereby integrating the frame 22, casters 21, and cover 23. This eliminates the need for two separate fastening operations: fastening the frame 22 to the casters 21 and fastening the frame 22 to the cover 23, making assembly easy.

[0053] Furthermore, since the relative movement between the cover 23 and the caster 21 is restricted by the restricting means, the frame 22, the caster 21 and the cover 23 can be assembled with a small number of bolts 5, making the assembly work even easier.

[0054] In particular, in this embodiment, the underside of the front end of the seat portion 211 of the caster 21 can abut against the lower plate portion 224b of the plate 224, and the movement of the caster 21 in a direction away from the cover 23 is restricted, so that the frame 22, caster 21, and cover 23 can be assembled with a single bolt 5, making the assembly work extremely simple.

[0055] Furthermore, the seat portion 211 of the caster 21 is arranged across the connecting rod member 223 on both sides and abuts against the connecting rod member 223 and the left and right seat receiving portions 232, 233, so that when the caster 21 is fixed to the cover 23, the seat portion 211 is prevented from tilting, and it is easy to attach the caster 21 accurately to the cover 23.

[0056] Furthermore, protrusions 232c, 233c and protrusions 232d, 233d are portions that extend from cover 23 downward beyond frame 22. In this way, protrusions 232c, 233c and protrusions 232d, 233d are provided on the cover 23 side, and therefore the relative positions of casters 21 and cover 23 can be easily maintained.

[0057] Furthermore, front panel portion 224c of plate 224 is a portion that extends downward from frame 22. In this way, movement is restricted by protrusions 232c, 233c and protrusions 232d, 233d on the cover 23 side and front panel portion 224c on the frame 22 side, which increases the sense of unity between frame 22, caster 21, and cover 23, making it easier to maintain their respective relative positions.

[0058] Next, the installation state of the caster 21' attached to the center of the lower part of the car body 20 will be specifically described.

[0059] As shown in FIGS. 7 and 8, the cover 23 is provided with seat receiving portions 234, 235 on both the left and right sides of the protruding pieces 23Ab, 23Bb.

[0060] The left-side seat receiving portion 234 comprises a first piece 234a extending downward from the first rib 241, second pieces 234b, 234b extending downward from two second ribs 242, 242 that intersect with the first piece 234a, and a cylindrical portion 234e located at the intersection of the front second piece 234b and the first piece 234a and extending in the vertical direction.

[0061] The first piece 234a has downwardly protruding projections 234c at its front and rear ends, respectively. The second pieces 234b each have a downwardly protruding projection 234d at their left ends. The cylindrical portion 234e also has a through-hole through which a bolt 5 can be inserted.

[0062] The right-side seat receiving portion 235 comprises a first piece 235a extending downward from the first rib 241, second pieces 235b, 235b extending downward from two second ribs 242, 242 that intersect with the first piece 235a, and a cylindrical portion 235e located at the intersection of the rear second piece 235b and the first piece 235a and extending in the vertical direction.

[0063] The first piece 235a has a protrusion 235c protruding downward at its front end and rear end. The second piece 235b has a protrusion 235d protruding downward at its right end. The cylindrical portion 235e has a through-hole through which a bolt 5 can be inserted.

[0064] The connecting rod member 223' has a generally downward U-shape in cross section, and its upper surface is disposed in contact with the lower surfaces of the protruding pieces 23Ab and 23Bb.

[0065] The caster 21' is disposed across the left and right seat receiving portions 234, 235 by bringing the upper surface of the seat portion 211' into contact with the left and right seat receiving portions 234, 235. In this state, bolts 5 are inserted from below the cover 23 into the diagonally arranged through-holes 211a' and cylindrical portions 234e, 235e of the seat portion 211' and tightened into nuts (not shown) embedded in the upper surface of the cover 23, thereby fixing the caster 21' to the cover 23.

[0066] The lower surfaces of the left and right seat receiving portions 234, 235, that is, the lower surfaces of the first pieces 234a, 235a and second pieces 234b, 235b, are designed to be at the same height as the lower surface of the connecting rod member 223' installed on the cover .

[0067] Therefore, when the caster 21' is fixed to the cover 23, the upper surface of the seat portion 211' abuts against the lower surfaces of the seat receiving portions 234 and 235 and the lower surface of the connecting rod member 223'.

[0068] Furthermore, the protrusions 234c and 235c abut against a front surface 211c' and a rear surface 211b' of the seat 211' of the caster 21'. Furthermore, the protrusions 234d and 235d abut against a left surface 211d' and a right surface 211e' of the seat 211' of the caster 21'.

[0069] This allows the caster 21' to be properly positioned while restricting its movement in the front-to-back, left-to-right, and rotational directions relative to the cover 23. In other words, the protrusions 234c, 235c and the protrusions 234d, 235d function as restricting means for restricting the horizontal movement of the caster 21'.

[0070] In this way, the caster 21' and the cover 23 sandwich the frame 22 (connecting rod member 223') from above and below, and the caster 21' is fixed to the cover 23, thereby integrating the frame 22, caster 21', and cover 23. This eliminates the need for two separate fastening operations: fastening the frame 22 to the caster 21' and fastening the frame 22 to the cover 23, making assembly easy.

[0071] Furthermore, since the caster 21' is fixed to the cover 23 by the bolts 5 at positions diagonally opposite the seat portion 211', fewer bolts 5 are required to attach the caster 21' to the cover 23, simplifying the assembly process.

[0072] Furthermore, the casters 21' are arranged across the divided bodies 23A, 23B of the cover 23 and are fixed to each of the divided bodies 23A, 23B with bolts 5. Therefore, the casters 21' increase the connection strength of the divided bodies 23A, 23B, and the cover 23 can be easily assembled.

[0073] Furthermore, since the protruding pieces 23Ab, 23Bb of the divided bodies 23A, 23B are arranged across the adjacent divided bodies 23A, 23B, the strength of the joint between the divided bodies 23A, 23B can be increased.

[0074] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0075] For example, in the above embodiment, the regulating means for the casters 21 arranged at the four corners of the vehicle body 20 is provided on the cover 23 side (protrusions 232c, 233c, 232d, 233d) and the frame 22 side (front panel portion 224c of plate 224), and the regulating means for the caster 21' arranged in the center of the vehicle body 20 is provided only on the cover 23 side (protrusions 234c, 235c, 234d, 235d), but it may also be provided only on the frame 22.

[0076] In the above embodiment, the casters 21, 21' straddle the connecting rod members 223, 223' of the frame 22 from side to side, but they may straddle the front rod member 221 or the rear rod member 222 from front to back, for example.

[0077] In the above embodiment, the seat portions 211, 211' are rectangular in plan view, but may be circular, elliptical, or other polygonal in plan view.

[0078] In addition, while the frame 22 is shaped like a ladder in the above embodiment, it is not limited to this. For example, it may be a rectangular or H-shaped frame. That is, there may be one or three or more members extending in the left-right direction, and there may be one or three or more members extending in the front-rear direction.

[0079] In the above embodiment, the cover 23 is composed of two divided bodies 23A and 23B, but it may be composed of three or more divided bodies, or may be composed of a single plate-like member. Furthermore, the cover 23 is not limited to being divided into left and right parts, but may also be divided into front and rear parts.

[0080] In the above embodiment, the cover 23 has the ribs 24, but the cover 23 may not have the ribs. The shape of the ribs 24 is not limited to that of the above embodiment.

[0081] Furthermore, the protruding pieces 23Ab, 23Bb of the segments 23A, 23B are not limited to the configuration of the above embodiment. For example, one segment may have a protruding portion and the other segment may have a recessed portion, with the protruding portion inserted into the recessed portion. Furthermore, the protruding pieces 23Ab, 23Bb may be omitted.

[0082] In addition, in the above embodiment, the bolts 5 are used to connect the cover 23 and the casters 21, but the connecting means may be freely changed.

[0083] In the above embodiment, the restricting means has both front-rear and left-right contact portions, but this is not limiting and it is sufficient if it has at least one of front-rear or left-right contact portions. Even in this case, it is possible to restrict the movement of the caster in the front-rear or left-right direction and the rotational direction relative to the cover.

[0084] In the above embodiment, the plate 224 is shown as having the back plate 224a and the front plate 224c connected by the left and right separated lower plate portions 224b, 224b, but the insertion port may be a slit provided in the back plate, and the lower plate portion may be an integral structure connected to the left and right, thereby increasing the strength of the plate.

[0085] In addition, in the above embodiment, an example was given of a form in which the casters 21, 21' are fixed to the cover 23 by screwing the bolts 5 into nuts embedded above the cylindrical portions 233e, 234e, 235e in the cover 23, but a female threaded portion may be provided on the inner surface of the cylindrical portions 233e, 234e, 235e, and the bolts 5 may be screwed into the female threaded portion. [Explanation of symbols]

[0086] 1 cart 5 volts 20 Body 21,21' Caster 22 frames 23 Cover 23A,23B Split body 23Ab,23Bb Projecting piece 211,211' seat 212 Wheels 221 Front rod member 222 Rear rod member 223,233' Connecting rod member 224b Lower plate part (regulating means, lower surface contact part) 224c Front plate part (regulating means, front and rear contact parts) 232,233 Seat receiving part 232c Projection (regulating means, front and rear contact parts) 232d Projection (regulating means, left and right contact parts) 233c Projection (regulating means, front and rear contact parts) 233d Projection (regulating means, left and right contact parts) 234,235 Seat receiving part 234c Projection (regulating means, front and rear contact parts) 234d Projection (regulating means, left and right contact parts) 235c protrusion (regulatory means, front and rear joints) 235d protrusion (regulatory means, left and right joints)

Claims

1. A dolly comprising casters, a frame disposed above the casters, and a plate-shaped cover disposed above the frame on which luggage can be placed, The dolly includes a restricting means for restricting horizontal movement of the caster relative to the cover, The caster is fixed to the cover in a state where its horizontal movement is restricted by the restricting means and it is in contact with the lower part of the frame.

2. A seat portion is provided on the upper portion of the caster, spanning the frame from front to back or left to right, 2. The bogie according to claim 1, wherein a seat receiving portion that abuts against an upper surface of the seat portion is provided on a lower surface of the cover.

3. The seat portion has a rectangular shape in a plan view, The bogie described in claim 2, characterized in that the regulating means has at least one of front and rear abutment portions that abut the front and rear surfaces of the seat portion, and left and right abutment portions that abut the left and right surfaces of the seat portion.

4. 3. The bogie according to claim 2, wherein the restricting means has a lower surface abutment portion that abuts against the lower surface of the seat portion.

5. 2. The bogie according to claim 1, wherein the restricting means has a portion extending from the cover downwardly beyond the frame.

6. 6. The bogie according to claim 5, wherein the restricting means further comprises a portion extending downward from the frame.

7. The cover is made up of a plurality of divided bodies, The bogie according to claim 1 , wherein the casters are fixed to the divided bodies so as to straddle the divided bodies.

8. 8. The bogie according to claim 7, wherein the divided bodies are provided with protruding pieces extending across adjacent divided bodies.

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