Trolley

Abstract

To provide a trolley that travels in a connection state more stably as compared to conventional ones.SOLUTION: In a trolley 10 of the present disclosure, a connection member 20 that connects trolleys 10 is allowed to pass through a through hole 32 penetrating an end of a table 11 in a longitudinal direction H1 and is protected from abutment with baggage, and therefore, limitation of a degree of freedom of motion in travel due to baggage riding on the connection member 20 as in conventional ones does not occur. As a result, the travel of the trolley 10 in the connection state is stabilized.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a multi-unit connectable bogie. [Background technology]

[0002] Conventionally, as this type of bogie, there is known one in which the bases of the bogies are connected to each other by connecting members extending from the bases (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 9-315315 (Figs. 1, 4, 23, 24) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional trolleys described above, there is a problem in which luggage climbs up onto the connecting members connecting the trolleys, restricting their freedom of movement and making the trolley unstable, so a solution to this problem is required. [Means for solving the problem]

[0005] A first aspect of the invention made to solve the above-mentioned problems is a trolley that can be connected to multiple trolleys, and has a connecting member that protrudes vertically from one vertical end of a base that is rectangular in plan view and has a tip that is bent downward to form a downward protrusion, and a protrusion receiving portion formed at the other vertical end of the base with which the downward protrusion of another trolley engages, and the trolley has a through hole that penetrates the wall portion of the other end of the base in the vertical or diagonal vertical direction and through which the connecting member passes when the downward protrusion is engaged with the protrusion receiving portion.

[0006] A second aspect of the invention is the trolley described in the first aspect, in which a portion of the through hole and the protrusion receiving portion are located below the luggage carrying surface of the base, and the trolley is provided with a ceiling wall located above the through hole at the outer edge of the luggage carrying surface and whose upper surface is the luggage carrying surface.

[0007] A third aspect of the invention is a trolley as described in the first or second aspect, in which the inner upper surface of the through hole is provided with a first inclined portion that descends in the vertical direction as it approaches the protrusion receiving portion.

[0008] A fourth aspect of the invention is a trolley described in any one of the first to third aspects, in which the connecting member is supported so as to be tiltable up and down, and the inner lower surface of the through hole is provided with a second inclined portion that rises as it approaches the protrusion receiving portion in the vertical direction, and a third inclined portion that descends toward the protrusion receiving portion is provided between the second inclined portion and the protrusion receiving portion.

[0009] A fifth aspect of the invention is a trolley described in any one of the first to fourth aspects, in which a stopper protrusion that protrudes in a stepped manner from the outer edge of the upper surface of the base and stops luggage is arranged across above the through hole.

[0010] A sixth aspect of the invention is a trolley described in any one of the first to fifth aspects, which is provided with stopper protrusions that protrude in a stepped manner from only both vertical ends of the outer edge of the top surface of the base, or from only both vertical ends and one horizontal end of the base, to stop luggage, and which can slide-load luggage only from an open portion, which is the outer edge of the top surface of the base that does not have the stopper protrusions.

[0011] A seventh aspect of the invention is the trolley described in the sixth aspect, in which the outer edge of the upper surface of the base, which forms the open portion, is provided with an anti-slip protrusion that protrudes lower than the stopper protrusion and increases the frictional resistance between the luggage and the base, thereby preventing the luggage from slipping.

[0012] In this disclosure, "wall of the base" means the wall of the member that constitutes the base, and "wall of the other end of the base" means the wall of the member that constitutes the end of the base opposite the side having the connecting member. Effect of the Invention

[0013] In the trolley of the first aspect of the invention, the connecting members connecting the trolleys are passed through through holes that penetrate the vertical ends of the base and are protected from contact with luggage, so that luggage does not ride up onto the connecting members connecting the trolleys as in the conventional case, restricting the freedom of movement during travel, and the travel of the trolleys in the connected state is stabilized.

[0014] According to the trolley of the second aspect of the invention, when a box-shaped cargo is loaded by sliding the cargo loading surface in an inclined position, it is expected that the corners of the cargo, which are subjected to the greatest load on the base, will pass through the outer edge of the cargo loading surface. However, since the ceiling wall covers from above the through holes located on the outer edge of the cargo loading surface and the upper surface of the ceiling wall forms the cargo loading surface, the corners of the cargo are prevented from getting caught in the through holes, enabling the cargo to be loaded smoothly.

[0015] The trolley of the third aspect of the invention has a first inclined portion on the inner upper surface of the through hole that slopes downward as it approaches the protrusion receiving portion, so that the tip of the connecting member passes smoothly through the through hole and engages with the protrusion receiving portion, and the connecting member engaged with the protrusion receiving portion is restricted from moving upward by the first inclined portion, preventing the connecting member from easily coming off the protrusion receiving portion due to impact, etc.

[0016] According to the configuration of the fourth aspect of the invention, when the tip of the connecting member of one bogie is inserted into the through-hole of the other bogie and the bogie is brought closer to the other bogie, the tip of the connecting member is guided by the second inclined portion on the inner lower surface of the through-hole and tilts upward, and when the tip of the connecting member passes the second inclined portion, the tip of the connecting member is guided by the third inclined portion and tilts downward and is guided into the protrusion receiving portion. In this way, the bogies are smoothly connected to each other.

[0017] In the trolley of the fifth aspect of the invention, the stopper projection that projects in a stepped shape from the outer edge of the upper surface of the base to stop luggage crosses above the through hole and also plays a role in reinforcing the base.

[0018] In the sixth aspect of the invention, a plurality of carts are arranged in the vertical direction of the base and connected together. Since stopper protrusions protrude in a stepped shape from both vertical ends of the outer edge of the top surface of the base, it is possible to prevent the load from falling off the base due to acceleration / deceleration while the cart is traveling. Furthermore, since one or both horizontal ends of the outer edge of the top surface of the base are open without stopper protrusions, it is possible to easily slide the load onto each cart when the carts are connected together.

[0019] In the dolly of the seventh aspect of the invention, the opening is provided with an anti-slip protrusion, so that baggage is prevented from slipping out of the opening. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of the top side of a dolly according to a first embodiment of the present disclosure; [Diagram 2] A perspective view of the underside of the trolley [Diagram 3] Side cross-sectional view of the connection between the carriages [Figure 4] Plan view of the front part of the platform [Diagram 5] A cutaway perspective view of the rear of the platform [Figure 6] Rear view of the platform [Figure 7] A perspective view of the carriages before they are coupled together [Figure 8] A perspective view of the carriages being coupled together [Figure 9] Plan view of multiple connected carriages [Figure 10] A perspective view of multiple connected carriages [Figure 11] FIG. 13 is a perspective view of a base of the carriage according to the second embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] [First embodiment] A dolly 10 according to a first embodiment of the present disclosure will be described below with reference to Figs. 1 to 10. The dolly 10 according to this embodiment shown in Fig. 1 includes a resin base 11 that is rectangular in plan view. Hereinafter, the longitudinal direction of the base 11 will be referred to as the "longitudinal direction H1," and the lateral direction of the base 11 will be referred to as the "lateral direction H2." In addition, the side of the longitudinal direction H1 that has a connecting member 20, which will be described later, will be referred to as the "front side," and the opposite side will be referred to as the "rear side."

[0022] The base 11 has a main plate 13 on the upper surface, and a lattice-shaped lower surface rib 11L shown in FIG. 2 is stretched around the lower surface of the main plate 13. In addition, a substantially rectangular opening 12 having a size of about half the overall length and width of the base 11 is formed in the center of the base 11. Furthermore, casters 19 are arranged at the four corners of the lower surface of the base 11, and the base plates 19A above the casters 19 are fixed in a state of being accommodated in a recess surrounded by the lower end of the lower surface rib 11L. In addition, as shown in FIG. 1, rectangular wheel receiving recesses 14 elongated in the vertical direction H1 are formed at the four corners of the upper surface of the base 11 directly above one caster 19. When the carts 10 are stacked on top of each other, these wheel receiving recesses 14 receive the casters 19 of the upper cart 10, thereby restricting the misalignment of the upper and lower carts 10. In addition, reinforcing ribs 14A are formed within the two rear wheel receiving recesses 14.

[0023] Of the four outer edges of the top surface of the base plate 11, the stopper protrusions 15-17 protrude from the outer edges of three of the four edges except for the outer edge of one end in the horizontal direction H2. The stopper protrusions 15-17 have an inner side surface that rises substantially vertically from the upper surface of the main plate 13, a horizontal upper surface, and an outer side surface that is flush with the outer side surface of the entire base plate 11. Furthermore, the stopper protrusions 15-17 are substantially entirely hollow except for a portion, and the internal space is open downward. The wheel receiving recess 14 is disposed away from any of the stopper protrusions 15-17.

[0024] The horizontal upper surface of the base 11 surrounded by the stopper projections 15-17 forms the luggage placement surface 11A. The outer edge of one end of the outer edge of the upper surface of the base 11 in the horizontal direction H2 that does not have the stopper projections 15-17 forms an opening 18 for sliding luggage onto the luggage placement surface 11A. In the opening 18, the outer edge of the upper surface of the base 11 forms a slope 18B that is slightly downwardly inclined toward the outside. Furthermore, the ends of the inner surfaces of the stopper projections 15, 16 facing each other in the vertical direction H1 that are located at the opening 18 form a pair of slopes 18A that are inclined so as to move away from each other toward the outside.

[0025] As shown in Figures 1 and 3, in the middle of the stopper protrusion 16 at the front end in the horizontal direction H2, a front recess 16A is formed by removing the front portion from a midpoint in the vertical direction H1 from the upper end of the stopper protrusion 16 to the lower end of the lower surface rib 11L.

[0026] 2 and 3, a lower protrusion 25 extends downward from the lower surface rib 11L at the center of the horizontal direction H2 on the underside of the front end of the base plate 11, and projects forward to a position facing the front recess 16A from below. The front surface of the lower protrusion 25 is disposed flush with the entire front surface of the base plate 11.

[0027] As shown in Fig. 4, the lower protrusion 25 is provided with a support hole 24 that penetrates vertically through the center in the horizontal direction H2. The support hole 24 has a circular lower opening and an elliptical upper opening that extends rearward from a position directly above the lower opening, and as shown in Fig. 3, the support hole 24 gradually widens rearward from the lower opening to a midpoint in the vertical direction. The connecting member 20 is attached to the support hole 24.

[0028] The connecting member 20 is formed by bending both ends of a metal round bar at a right angle, and has a support part 22 bent at a right angle downward from the base end of the horizontally extending swivel part 21, and a downward protrusion 23 bent at a right angle downward from the tip end of the swivel part 21. The support part 22 extends downward from the downward protrusion 23, and a male screw part (not shown) is formed at its lower end. The support part 22 is inserted into the support hole 24 from above, and a nut 22N is screwed into the lower end to prevent it from coming off the support hole 24. The connecting member 20 is rotatable between a position facing one side of the lateral direction H2 from the support hole 24 and a position facing the other side, and the support part 22 tilts so as to fall backward from the vertical state to the support hole 24.

[0029] When not in use, the connecting member 20 is in a standby state facing either one of the horizontal directions H2. In the standby state, as shown in FIG. 4, the tip of the connecting member 20 is located on the side of the front recess 16A and fits under the base 11. In addition, in order to prevent the connecting member 20 from jumping up to the standby state, a pair of protrusions 26 protrude from the front surface inside the front recess 16A and face the rotating part 21 of the connecting member 20 in the standby state from above. Furthermore, in order to prevent the connecting member 20 from rotating forward from the standby state due to vibration or the like, a pair of protrusions 27 are formed on the front edge of the upper surface of the lower protrusion 25. The pair of protrusions 27 are formed symmetrically on both sides of the front region of the support hole 24, extend in the horizontal direction H2, and become higher as they approach each other. In addition, when using the connecting member 20, the rotating part 21 is slid on the protrusions 27 and rotated to a position extending forward from the support hole 24. Then, the swivel portion 21 fits between the pair of protrusions 27, and the connecting member 20 is held in a usable state in which it protrudes forward from the base 11.

[0030] As shown in Fig. 3, the rear end of the base plate 11 is provided with a connected portion 30 to which a connecting member 20 of another bogie 10 can be connected. In order to form the connected portion 30, a lower protrusion 39 is provided on the underside of the rear end of the base plate 11, extending downward from the lower surface rib 11L in the center in the lateral direction H2, as shown in Fig. 2. Note that, as shown in Fig. 3, the lower end surface of the lower protrusion 39 is located at the same height as the lower end surface of the lower protrusion 25, and the rear surface of the lower protrusion 39 is disposed flush with the entire rear surface of the base plate 11.

[0031] The connected portion 30 includes a projection receiving portion 31 and a through hole 32. The projection receiving portion 31 passes vertically from the lower end surface of the lower projection 39 to the luggage placement surface 11A. As shown in FIG. 2, the shape of the lower end opening of the projection receiving portion 31 is an isosceles triangle elongated in the vertical direction H1, with its base located at the front side and its rear end corners being chamfered in an arc shape. Furthermore, as shown in FIG. 3, the projection receiving portion 31 has the same cross-sectional shape as the lower end opening from the lower end to the vertical middle position, and the through hole 32 communicates with the portion above the vertical middle position of the projection receiving portion 31 from the rear via a groove portion 32M described later.

[0032] As shown in Fig. 1 and Fig. 6, the through hole 32 penetrates the wall of the base 11 obliquely with respect to the vertical direction H1, and is surrounded on all sides by the wall of the base 11. The through hole 32 and a groove portion 32M, which is opened at the upper surface of the through hole 32 and will be described later, form an introduction path 32D for introducing the tip of the connecting member 20 from the rear surface of the base 11 into the protrusion receiving portion 31. The rear end opening of the through hole 32 has a horizontally long rectangular shape, and is formed from a position close to the lower end of the lower protrusion 39 to a position slightly lower than the load placement surface 11A in the vertical direction as shown in Fig. 3, and expands symmetrically in the horizontal direction H2 with the protrusion receiving portion 31 as the center, and is about 2 to 4 times the maximum width (front end width) of the protrusion receiving portion 31.

[0033] 5(A), the inner lower surface 36 of the through hole 32 includes a second inclined portion 36A that rises toward the protrusion receiving portion 31 in the vertical direction H1, and a third inclined portion 36B that is slightly downwardly sloping from the front end of the second inclined portion 36A to the protrusion receiving portion 31. The first inclined portion 35B is provided on the inner upper surface 35 of the through hole 32, as described later. The inclination angle of the second inclined portion 36A with respect to the horizontal direction is 30 to 60 degrees, while the inclination angle of the third inclined portion 36B with respect to the horizontal direction is about 1 to 10 degrees.

[0034] The second inclined portion 36A extends from the rear end of the base 11, past below the stopper projection 15, to a position below the load placement surface 11A. Meanwhile, the third inclined portion 36B has a length in the vertical direction H1 that is much shorter than that of the second inclined portion 36A. Furthermore, as shown in FIG. 3, the boundary between the second inclined portion 36A and the third inclined portion 36B, which is the top portion of the inner lower surface 36, is located at the same height as the front portion of the support hole 24 on the upper surface of the lower projection 25.

[0035] Then, as shown in Fig. 7, when the bogie 10 with the connecting member 20 in a usable state is inserted into the coupled portion 30 of another bogie 10, the lower end of the downward projection 23 of the connecting member 20 of the rear bogie 10 abuts against a position near the rear lower end of the second inclined portion 36A in the through hole 32 of the front bogie 10. When the rear bogie 10 is moved closer to the front bogie 10 in this state, the downward projection 23 slides against the second inclined portion 36A and moves upward, and the connecting member 20 tilts upward, as shown in Fig. 8. Then, when the lower end of the downward projection 23 passes the top portion of the inner lower surface 36, it slides against the third inclined portion 36B and moves slightly downward, and the connecting member 20 tilts slightly downward. When the downward protrusion 23 is positioned above the rear end of the protrusion receiving portion 31, it drops all at once and engages with the protrusion receiving portion 31 as shown in Fig. 3, and the carts 10 are connected to each other. When the connected carts 10 are pulled together, the arcuate surface 31A at the rear end of the protrusion receiving portion 31 comes into contact with the arcuate surface that is the side surface of the downward protrusion 23.

[0036] 1 and 6, a pair of inner surfaces 37 of the through hole 32 are formed flat from the rear surface of the base 11 to a position slightly forward of the arc surface 31A of the protrusion receiving portion 31, are parallel to the up-down direction, and are inclined toward the front in the vertical direction H1. As a result, even if the connecting member 20 is shifted or inclined in the horizontal direction H2 inside the through hole 32, it is guided toward the protrusion receiving portion 31.

[0037] As shown in FIG. 3, the inner upper surface 35 of the through hole 32 is formed from the rear end of the base 11 to a position slightly forward of the top of the inner lower surface 36. More specifically, the rear part of the through hole 32 is covered from above by the middle part of the stopper protrusion 15, and the front part of the through hole 32 is covered from above by the ceiling wall 34, the upper surface of which forms part of the outer edge of the load placement surface 11A. The front end of the ceiling wall 34 is within a range directly above the third inclined portion 36B. That is, the through hole 32 is formed up to a position just before the protrusion receiving portion 31, and from the front end of the through hole 32 to the protrusion receiving portion 31, the through hole 32 is opened upward and forms a groove portion 32M that opens to the load placement surface 11A, which is the upper surface of the base 11.

[0038] As shown in FIG. 6, the intermediate portion of the stopper protrusion 15 crossing above the through hole 32 has a structure including a plurality of horizontal ribs 15L1 extending in the horizontal direction H2, vertical ribs 15L2 extending in the vertical direction and intersecting the horizontal ribs 15L1, a front wall 15A that blocks the space between the horizontal ribs 15L1 from the front, and a partition wall 15B that separates the internal space on both sides of the intermediate portion of the stopper protrusion 15 from the space between the horizontal ribs 15L1.

[0039] 5(B), the inner upper surface 35 of the through hole 32 has a first horizontal portion 35A from the rear end of the through hole 32 to a position midway in the vertical direction H1 of the ceiling wall 34, a first inclined portion 35B that slopes downward toward the front from the first horizontal portion 35A to a position near the front end of the ceiling wall 34, and a second horizontal portion 35C from the third inclined portion 36B to the front end of the ceiling wall 34. This allows the front end of the connecting member 20 passing under the ceiling wall 34 to be guided downward, making it easier for the downward protrusion 23 of the connecting member 20 to engage with the protrusion receiving portion 31. Furthermore, since the through hole 32 narrows toward the protrusion receiving portion 31 due to the first inclined portion 35B and the third inclined portion 36B, even if the connecting member 20, whose downward protrusion 23 is engaged with the protrusion receiving portion 31, bounces up or down due to an impact or the like, the amount of the bounce is limited, and the connecting member 20 will not inadvertently come off the protrusion receiving portion 31.

[0040] The configuration of the bogie 10 of this embodiment has been described above. Next, the action and effect of the bogie 10 will be described. The bogie 10 of this embodiment can be used alone, or can be used by connecting a plurality of bogies as shown in Figs. 9 and 10. To connect the bogies 10 to each other, the connecting member 20 is set in a usable state as described above, and the bogies 10 are brought close to each other. Then, as shown in Fig. 3, the connecting member 20 of the rear bogie 10 passes through the through hole 32 of the front bogie 10 and engages with the protrusion receiving portion 31, and the bogies 10 are connected to each other. Then, a state is created in which the bogies 10 are allowed to rotate around the downward protrusion 23 of the connecting member 20 between them.

[0041] In addition, the multiple connected carts 10 have stopper projections 15, 16 in the line-up direction of the multiple carts 10, preventing the cargo from shifting due to acceleration and deceleration during travel. At the same time, the multiple carts 10 have an opening 18 on one side perpendicular to the line-up direction, so that cargo can be easily loaded and unloaded onto the cargo placement surface 11A of the base 11 of each cart 10 without being hindered by the stopper projections 15, 16, 17. In addition, the opening 18 has slopes 18A, 18B, so that the cargo can be slid smoothly onto the cargo placement surface 11A.

[0042] In addition, when the cargo is box-shaped like the container 70 shown in Figs. 9 and 10, the cargo may be slid on the cargo placement surface 11A of the base 11 in an inclined position with one end lowered in the horizontal direction H2. In this case, the base 11 may receive the largest load from the two corners of the cargo that are on the lower side in the inclined position. In contrast, the wheel receiving recess 14 on the cargo placement surface 11A is provided away from the stopper protrusions 15 and 16 extending in the horizontal direction H2, so that the corners of the cargo will not get caught by the wheel receiving recess 14. In addition, the through hole 32 is also covered by the ceiling wall 34 near the stopper protrusion 15, and the upper surface of the ceiling wall 34 is also part of the cargo placement surface 11A, so that the corners of the cargo will not get caught by the through hole 32.

[0043] Also, although not shown, luggage may be packed in a bag and loaded onto the trolley 10. Such luggage may easily deform and collapse onto the connecting portion of the trolleys 10. However, in the trolley 10 of this embodiment, the connecting member 20 connecting the trolleys 10 is passed through the through hole 32 and is protected from the luggage abutting against it. This prevents the luggage from climbing onto the connecting member 20 connecting the trolleys 10 and restricting the freedom of movement as in the conventional case, and the travel of the trolleys 10 in the connected state is stabilized. In addition, since the above-mentioned stopper protrusion 15 is formed to cross the upper part of the through hole 32, in addition to preventing the luggage from shifting, the stopper protrusion 15 also reinforces the base plate 11.

[0044] [Second embodiment] In FIG. 11, the dolly 10V of this embodiment is shown without the casters. The base 11V of this dolly 10V has the stopper protrusions 17 at the ends in the horizontal direction H2 removed from the base 11 of the first embodiment, and has openings 18 on both sides in the horizontal direction H2. Each opening 18 has a pair of anti-slip protrusions 75 on the edge of the luggage placement surface 11A along the slope 18B. The anti-slip protrusions 75 are protrusions that have a trapezoidal cross section and extend in the vertical direction H1, and protrude less from the luggage placement surface 11A than the stopper protrusions 15 and 16. The anti-slip protrusions 75 also have a horizontal upper surface 75B, a nearly vertical slope 75C on the outer side of the upper surface 75B, and a gently sloping slope 75A on the opposite side.

[0045] In the present embodiment, the dolly 10V has stopper projections 15, 16 projecting in a stepped manner from both ends in the vertical direction H1 of the outer edge of the top surface of the base plate 11, preventing cargo from falling off the base plate 11 due to acceleration / deceleration during travel of the dolly 10V. In addition, both ends in the horizontal direction H2 of the outer edge of the top surface of the base plate 11 do not have stopper projections 15, 16, and instead have openings 18 equipped only with anti-slip projections 75 that are significantly lower than the stopper projections 15, 16, so that cargo can be easily slid onto the dolly 10V when it is connected. In addition, since each opening 18 is equipped with an anti-slip projection 75, cargo is prevented from easily sliding off the opening 18.

[0046] [Other embodiments] (1) In the cart 10V of the second embodiment, the anti-slip protrusions 75 may be removed from each opening 18.

[0047] (2) In the first embodiment, the connecting member 20 of the trolley 10 was supported so as to be rotatable, but the connecting member 20 may only tilt up and down, or may be fixed to the base 11 so as not to tilt or rotate, or may be formed integrally with the base 11.

[0048] (3) In the dolly 10 of the first embodiment, the lower end of the protrusion receiving portion 31 may be closed. Also, the upper end of the protrusion receiving portion 31 may be closed so that the protrusion receiving portion 31 does not open to the baggage placement surface 11A.

[0049] (4) In the first embodiment, the groove portion 32M is formed between the through hole 32 and the projection receiving portion 31, with the upper surface of the through hole 32 being open. However, the upper surface of the groove portion 32M may also be covered with the ceiling wall 34 to form the through hole 32. Also, only the portion of the through hole 32 covered with the stopper projection 15 may be left, and the entire upper portion of the through hole 32 forward of the stopper projection 15 may be opened upward to form the groove portion 32M. Furthermore, the portion above the through hole 32 may be a plate-shaped wall portion that does not have the stopper projection 15. Whether or not to open the upper surface of a part of the through hole 32 to form the groove portion 32M and whether or not to open the upper surface of the projection receiving portion 31 may be freely combined.

[0050] (5) In the first embodiment, the inner underside 36 of the through hole 32 was configured so that the through hole 32 penetrated the wall portion of the base plate 11 at an angle to the vertical direction H1, but the through hole 32 may also be configured so that it penetrates the wall portion of the base plate 11 parallel to the vertical direction H1.

[0051] (6) In the bogie 10 of the first embodiment, any one of the stopper protrusions 15-17 may be eliminated, or all of them may be eliminated to make the upper surface of the base 11 flat. Also, the stopper protrusions 15-17 may be provided intermittently along each outer edge of the upper surface of the base 11. Furthermore, in the bogie 10 of the first embodiment, the outer surfaces of the stopper protrusions 15-17 and the outer surface of the base 11 below the stopper protrusions 15-17 are flush with each other, but they do not have to be flush with each other.

[0052] (7) In the first embodiment, the third inclined portion 36B on the inner lower surface 36 of the through hole 32 is inclined downward toward the protrusion receiving portion 31, but the third inclined portion 36B may be inclined upward toward the protrusion receiving portion 31 at an angle different from that of the second inclined portion 36A (which may be an angle larger or smaller than that of the second inclined portion 36A). In addition, the third inclined portion 36B may not be provided, and the second inclined portion 36A may extend to the protrusion receiving portion 31, or a flat and horizontal portion may be provided instead of the third inclined portion 36B of the inner lower surface 36. When a horizontal portion is provided instead of the third inclined portion 36B, the horizontal portion becomes the apex portion of the inner lower surface 36, and the front end of the ceiling wall 34 may be located within the range of the apex portion, or the entire horizontal portion may be covered by the ceiling wall 34.

[0053] In addition, although this specification and drawings disclose specific examples of the technology included in the scope of the claims, the technology described in the claims is not limited to these specific examples, but includes various modifications and variations of the specific examples, as well as parts of the specific examples taken alone. [Explanation of symbols]

[0054] 10,10V Cart 11,11V base plate 11A Luggage loading area 15~17 Stopper protrusion 18 Open area 20 Connecting members 23 Downward protrusion 30 Connected part 31 Protrusion receiving part 32 Through hole 34 Ceiling Wall 35 Inside top surface 35B 1st slope part 36 Inner lower surface 36A 2nd slope section 36B 3rd slope part 37 Inner surface 39 Lower protrusion 75 Anti-slip protrusion

Claims

1. A connecting member that protrudes in the vertical direction from one end of the base plate that is rectangular in plan view and has a tip that is bent downward to form a downward protrusion; A protrusion receiving portion is formed on the other end of the base in the vertical direction, and the protrusion receiving portion is engaged with the downward protrusion of another carriage. a through hole penetrating the wall portion at the other end of the base in the vertical direction or the oblique vertical direction, through which the connecting member passes when the downward protrusion is engaged with the protrusion receiving portion; A dolly in which the connecting member can pass through the through hole and the downward protrusion can engage with the protrusion receiving portion while maintaining a state in which the connecting member does not protrude from the upper surface of the base.

2. A connecting member that protrudes in the vertical direction from one end of the base plate that is rectangular in plan view and has a tip that is bent downward to form a downward protrusion; A protrusion receiving portion is formed on the other end of the base in the vertical direction, and the protrusion receiving portion is engaged with the downward protrusion of another carriage. a through hole penetrating the wall portion at the other end of the base in the vertical direction or the oblique vertical direction, through which the connecting member passes when the downward protrusion is engaged with the protrusion receiving portion; A dolly having an inner upper surface of the through hole that is provided with a first inclined portion that descends in the vertical direction as it approaches the protrusion receiving portion.

3. A connecting member that protrudes in the vertical direction from one end of the base plate that is rectangular in plan view and has a tip that is bent downward to form a downward protrusion; A protrusion receiving portion is formed on the other end of the base in the vertical direction, and the protrusion receiving portion is engaged with the downward protrusion of another carriage. a through hole penetrating the wall portion at the other end of the base in the vertical direction or the oblique vertical direction, through which the connecting member passes when the downward protrusion is engaged with the protrusion receiving portion; The connecting member is supported so as to be tiltable up and down, A dolly having a second inclined portion on an inner lower surface of the through hole, the second inclined portion rising as it approaches the protrusion receiving portion in the vertical direction.

4. The dolly according to claim 3 , further comprising a third inclined portion between the second inclined portion and the projection receiving portion, the third inclined portion being downwardly inclined toward the projection receiving portion.

5. A connecting member that protrudes in the vertical direction from one end of the base plate that is rectangular in plan view and has a tip that is bent downward to form a downward protrusion; A protrusion receiving portion is formed on the other end of the base in the vertical direction, and the protrusion receiving portion is engaged with the downward protrusion of another carriage. a through hole penetrating the wall portion at the other end of the base in the vertical direction or the oblique vertical direction, through which the connecting member passes when the downward protrusion is engaged with the protrusion receiving portion; A stopper protrusion that protrudes in a stepped manner from the outer edge of the top surface of the base to stop luggage is provided across above the through hole.

6. A connecting member that protrudes in the vertical direction from one end of the base plate that is rectangular in plan view and has a tip that is bent downward to form a downward protrusion; A protrusion receiving portion is formed on the other end of the base in the vertical direction, and the protrusion receiving portion is engaged with the downward protrusion of another carriage. a through hole penetrating the wall portion at the other end of the base in the vertical direction or the oblique vertical direction, through which the connecting member passes when the downward protrusion is engaged with the protrusion receiving portion; A cart that has stopper protrusions that protrude in a stepped manner from only both vertical ends of the outer edge of the top surface of the base, or from only both vertical ends and one horizontal end of the base, to stop luggage, and that can slide-load luggage only from the open portion, which is the outer edge of the top surface of the base that does not have the stopper protrusions.

7. The trolley described in claim 6, wherein an anti-slip protrusion is provided on the outer edge of the upper surface of the base, which is the open portion, so as to protrude lower than the stopper protrusion and increase the frictional resistance between the luggage and the base, thereby suppressing the luggage from slipping.

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