Transport cart

Abstract

To provide a transportation trolley capable of nesting with a conventional trolley without detaching a panel as a door.SOLUTION: A transportation trolley includes: a front end part for arranging a front frame part located in forward; a rear end part for arranging a rear frame part located in rearward; and an undercarriage as a frame connecting the front end part and the rear end part. An opening and closing part that closes a side surface between the front frame part and the rear frame part is provided in a middle part located in the middle of the front end part and the rear end part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a transport cart having two pairs of four wheels on the bottom surface of each of the front and rear ends, and one or two intermediate wheels between them. [Background technology]

[0002] Transport carts used in the distribution industry for transporting or storing goods must be able to move straight when in use, but also need to be able to turn when moving the cart to a storage location (known as a nesting state) or from a storage location to a use location. A well-known solution to this problem is a transport cart with two pairs of four wheels on the bottom of the front and rear ends of the body, and one or two intermediate wheels between them.

[0003] When the transport cart is moved from the nested state to the state for use, the pallet, which is leaning almost upright in the nested state, is rotated to an almost horizontal position in order to place goods on the pallet, and this causes an impact and an impact noise when the pallet collides with the frame.

[0004] In order to solve the above problems, Japanese Patent Application Laid-Open No. 2014-091348 discloses "a transport cart having two pairs of four omnidirectional wheels at the front and rear ends of the chassis, and one pair of two intermediate wheels in the middle, and which takes measures to interpose an impact absorbing part between the pallet and the frame when a pallet that has been pulled up during nesting is rotated down during use."

[0005] The transport cart constructed as described above has been well received in the market because the shock absorbing portion is highly durable and can absorb shock without unnecessarily increasing costs.

[0006] Furthermore, in the above invention, there is a demand for a door panel to be disposed on the front or back of the transport cart. JP 2020-179846 A discloses such a device.

[0007] The transport cart disclosed in JP 2020-179846 has a removable door panel, and the door panel remains in place on the back, so it cannot be nested with conventional carts, and in order to nest, it is necessary to purchase a new transport cart.

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-091348 [Patent Document 2] Japanese Patent Publication No. 2020-179846 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0009] The present invention has been made in view of the above points, and an object of the present invention is to provide a transport cart that can be nested with a conventional cart without removing the door panel. [Means for solving the problem]

[0010] In order to solve the above problem, the transport cart of the first aspect has a front end portion for positioning the front frame portion at the front, a rear end portion for positioning the rear frame portion at the rear, and a chassis as a frame connecting the front end portion and the rear end portion, and the chassis has an opening / closing portion in an intermediate portion located halfway between the front end portion and the rear end portion for closing the side surface between the front frame portion and the rear frame portion.

[0011] In addition, the transport cart of the second aspect is the same as that of the first aspect, but has an intermediate platform below the opening / closing section, and has a gap between the opening / closing section and the intermediate platform through which the chassis of other transport carts can enter.

[0012] In addition, a transport cart according to a third aspect is the same as that according to the second aspect, in that the opening and closing section has a door section that closes the side, a rod-shaped support section that supports the door section so that it can be opened and closed, and a support base section for erecting the support section, and the support base section is arranged in the middle section.

[0013] In addition, the transport cart of a fourth aspect is the same as that of the third aspect, and further includes side frame portions that connect the front frame portion and the rear frame portion, and the side frame portions support the support portions.

[0014] In addition, the transport cart of the fifth aspect is the third or fourth aspect, in which the door section has a locking plate with a hole for fixing the door section when the door section is opened, and the door section has a locking bar that fits into the hole, and the locking bar fits into the hole when the door section is opened, thereby fixing the door section.

[0015] In addition, the transport cart of the sixth aspect is the same as that of the third or fourth aspect, except that it has a second locking section that secures the door section when the door section is opened, and an engaging member that engages with the second locking section, the second locking section being arranged on the chassis, and the engaging member being arranged on the door section.

[0016] In addition, the transport cart of the seventh aspect is the same as in the first to sixth aspects, and has a second fixing member that fixes the door portion when the door portion is closed, and a second fixed portion that comes into contact with and fixes the second fixing member, and the second fixing member is arranged on the door portion, and the second fixed member is arranged on the front frame portion. [Effects of the Invention]

[0017] The present invention is constructed and operates as described above, and therefore can provide a transport cart that can be nested with a conventional cart without removing the door panel. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of the transport cart in the first embodiment with the door closed. [Figure 2]FIG. 2 is a perspective view of the transport cart in the first embodiment with the door open. [Figure 3] FIG. 2 is a side view of the transport cart in the first embodiment with the door closed. [Figure 4] FIG. 2 is a left front view of the transport cart in the first embodiment. [Figure 5] FIG. 2 is a right front view of the transport cart of the first embodiment. [Figure 6] FIG. 1 is a plan view of a transport cart according to a first embodiment. [Figure 7] FIG. 2 is a side view of the transport cart in the first embodiment with the door open. [Figure 8] FIG. 2 is a plan view of the transport cart in the first embodiment with the door open. [Figure 9] FIG. 1 is a front view of a plurality of transport carts in a nested state with their doors open in the first embodiment. [Figure 10] FIG. 1 is a plan view showing a state in which a plurality of transport carts are nested with their doors open in the first embodiment. [Figure 11] FIG. 10 is a side view of the transport cart in the second embodiment with the door closed. [Figure 12] FIG. 10 is a plan view of the transport cart in the second embodiment with the door closed. [Figure 13] 11A is an enlarged view of XIIIA in Fig. 11. B is an enlarged view seen from the direction XIIIB in Fig. 11. [Figure 14] FIG. 10 is a side view of the transport cart in the second embodiment with the door open. [Figure 15] FIG. 10 is a plan view of the transport cart in the second embodiment with the door open. [Figure 16] 14A is an enlarged view of XVIA in Fig. 14. B is an enlarged view seen from the direction of XVIB in Fig. 14. BEST MODE FOR CARRYING OUT THE INVENTION

[0019] A first example will be described below with reference to the illustrated embodiment. The transport cart 10 of the first example has a substantially ladder-shaped front frame portion 20 arranged in the forward direction F, a substantially ladder-shaped rear frame portion 50 arranged in the rear direction R, a front end portion 35 that supports the front frame portion 20 so as to stand upright, and a rear end portion 65 that supports the rear frame portion 50 so as to stand upright.

[0020] The front frame 20 is supported by the front end 35. Specifically, the front frame 20 has a main shaft 21 that stands upright at the front end 35. The front frame 20 also has a first horizontal crossbar 22 supported by the main shaft 21 and disposed substantially horizontally, a first outer frame 23 smoothly connected to and integrated with the first horizontal crossbar 22, a rod-shaped second outer frame 24 that stands upright substantially vertically at the end of the first horizontal crossbar 22, and a plurality of horizontal crossbars 25 disposed substantially horizontally between the first outer frame 23 and the second outer frame 24. The first outer frame 23, the second outer frame 24, and the plurality of horizontal crossbars 25 form a ladder shape as described above. The lower end 24a of the second outer frame 24 protrudes downward from the first horizontal crossbar 22 and connects to the front frame 20. In this way, the lower end portion 24a restricts the direction when nesting with other transport carts 10. The first outer frame 23 also has a fixed mounting portion 28, which has a fixed portion 29 that keeps the door portion, which will be described later, closed. This will be described further below.

[0021] The second main shaft 21a in the front frame portion 20 is connected to the main shaft 21, is positioned approximately midway between the first outer frame 23 and the second outer frame 24, and stands upright parallel to them. The second main shaft 21a is connected to a plurality of horizontal beam portions 25 so as to intersect with them.

[0022] The rear frame 50 is supported by a rear end 65. That is, the rear frame 50 has a rear main shaft 51, which serves as an upright shaft, at the rear end 65. The rear main shaft 51 also has a substantially horizontally disposed rear first horizontal beam 52 supported by the rear main shaft 51, a rear first outer frame 53 smoothly connected to and integrated with the rear first horizontal beam 52, a rod-shaped rear second outer frame 54 that is substantially vertically disposed at the end of the rear first horizontal beam 52, and a plurality of rear horizontal beams 55 disposed substantially horizontally between the rear first outer frame 53 and the rear second outer frame 54, so that the rear first outer frame 53, the rear second outer frame 54, and the plurality of rear horizontal beams 55 form a ladder shape. The rear lower end 54a of the rear second outer frame 54 protrudes downward from the rear first horizontal beam 52 and connects to the rear frame 50. In this way, the rear lower end portion 54a restricts the direction when nesting with other transport carts 10. The rear second outer frame 54 also has a fixed mounting portion 58, which has a fixed portion 59 that keeps a door portion (described later) closed. This will be described in more detail below.

[0023] The second rear main shaft 51a is connected to the rear main shaft 51 and stands parallel to and between the first rear outer frame 53 and the second rear outer frame 54. The second rear main shaft 51a is also connected to a plurality of rear horizontal beams 55 so as to intersect with them.

[0024] The transport vehicle 10 of the first embodiment also has a chassis 80 that functions as a frame for the transport vehicle 10. The chassis 80 is composed of a rod-shaped member having a hollow structure with a square-shaped cross section. In the first embodiment, it is also preferable to arrange multiple members having a square-shaped hollow structure in parallel. The chassis 80 is connected to the main axle 21 in the forward direction F and to an outer cylindrical portion 85 in the rearward direction R. The outer cylindrical portion 85 is cylindrical and is arranged to be movable up and down so as to fit onto the rear axle 51. In addition, an intermediate platform 70 is attached below an intermediate portion 83 located midway between the front end portion 35 and the rear end portion 65 of the chassis 80, which will be described later. It is also preferable that the intermediate platform 70 be attached directly below the intermediate portion 83, as in the first embodiment.

[0025] The transport cart 10 of the first embodiment also has a pallet 90 as a base plate on which an article (not shown) is placed, and the pallet 90 is rotatably positioned between a horizontal position for placing an article and a substantially vertical position for nesting. The pallet 90 has a rod-shaped shaft 91 serving as an axis. A hollow cylindrical pipe 91 is attached to the crosspiece 52 of the rear frame 50, and the rod-shaped shaft 91 is rotatably attached within the hollow cylindrical pipe 92 (see FIG. 5). In this way, by rotating about the shaft 91 disposed within the pipe 92, the pallet 90 can rotate between a horizontal position for placing an article and a substantially vertical position for nesting, as described above.

[0026] Furthermore, wheel units 57, 57 that are wheels that can freely change direction in all directions by 360 degrees are attached to the bottom surface of the front end 35. Wheel units 67, 67 that are wheels that can freely change direction in all directions by 360 degrees are also attached to the bottom surface of the rear end 65. Furthermore, intermediate wheel units 72, 72 that are wheels whose running direction is fixed are attached to the intermediate platform unit 70. In this way, the transport cart 10 of the first embodiment is a so-called six-wheel cart that has two pairs of four wheel units 57, 57, 67, 67 arranged on the bottom surfaces of the front end 35 and rear end 65, and the intermediate wheel units 72, 72.

[0027] The transport cart 10 of the first embodiment also has a brake device 100. The brake device 100 is capable of locking the rotation of the middle wheels 72, 72, and this brake device 100 is already known.

[0028] Furthermore, the chassis 80 has an intermediate section 83 located midway between the front end section 35 and the rear end section 65, which has an opening / closing section 200 for closing the side surface S between the front frame section 20 and the rear frame section 50 of the transport cart 10 of the first embodiment in an openable / closable manner. The intermediate platform section 70 is also disposed below this intermediate section 83. The intermediate platform section 70 is also disposed below the intermediate section 83, and the opening / closing section 200 is disposed in this intermediate section 83. Therefore, the opening / closing section 200 and the intermediate platform section 70 are disposed at different heights (heights from the floor G), and a gap T is formed between the opening / closing section 200 and the intermediate platform section 70. The chassis of another transport cart can enter this gap T (see FIG. 2) when nesting, as will be described later, so that multiple transport carts can be nested.

[0029] The opening / closing unit 200 includes door sections 210F and 210R, rod-shaped support sections 220 that support the door sections 210F and 210R so that they can be opened and closed, and a support base 230 for erecting the support sections 220. The support base 230 is attached above the intermediate section 83 of the chassis 80. Preferably, the door sections 210F and 210R are symmetrical to each other, and therefore the following description will focus on the door section 210F, while the door section 210R may be given the same reference numeral and its description may be omitted. However, this does not exclude door sections 210F and 210R having different configurations. The fixing member 250 of the door section 210F may be different in size from the fixing member 250 of the door section 210R. The fixing member 250 will be described later.

[0030] The door section 210F has a square-shaped outer frame section 211, vertical bars 212, and multiple horizontal bars 213, and the outer frame section 211 has rod-shaped support sections 220 rotatably attached to rotating members 214. Also, a locking bar 215 is arranged in the square-shaped outer frame section 211 so as to be connected to the vertical bars 212. Also, the rotating member 214 is attached so as to be movable (slidable) up and down relative to the support sections 220. The locking bar 215 will be described later.

[0031] The support base 230 is flat, and has a base portion 231 attached to the middle portion 83 of the chassis 80. It has a tip portion 232 that protrudes in the width H direction, and rod-shaped support portions 220, 220 are erected on the tip portion 232.

[0032] Furthermore, a lock plate 240 having a hole 241 is disposed in the base portion 231 of the support base portion 230. The hole 241 in the lock plate 240 is fitted with a lock rod 215 for fixing the door portion 210F in the open state. This locks the door portion 210F in the open state, and the nesting state can be maintained. Note that the door portion 210F is attached to the rotating member 214 so that it can move up and down. Therefore, by moving the door portion 210F upward, the lock rod 215 rides up onto the lock plate 240, and by moving the door portion 210F downward, the door portion 210F is fixed to the lock plate 240 (see FIG. 2).

[0033] The fixing member 250 described above can maintain the door section 210F in a closed state by engaging with the fixed portion 29 described above. The fixing member 250 can be made by bending a metal piece, and is preferably hook-shaped. For example, when the fixing member 250 is hook-shaped, the fixed member 29 is annular. To engage the hook-shaped fixing member 250, the door section 210F having the fixing member 250 can be slid from top to bottom to engage them. Similarly, for the door section 210R, by sliding the door section 210R from top to bottom, the fixing member 250, when hook-shaped, can be engaged with the fixed member 59, when annular. In this way, the fixing member 250 can maintain the door section 210R in a closed state by engaging with the fixed portion 59 described above.

[0034] The transport cart 10 of the first embodiment also has side frame portions 300 that connect the front frame portion 20 and the rear frame portion 50. Specifically, the side frame portions 300 connect the upper end of the first outer frame 23 of the front frame portion 20 and the upper end of the rear second outer frame 54 of the rear frame portion 50, and are also connected to the upper ends of the support portions 220, 220.

[0035] Furthermore, by fixing the upper ends of the support portions 220, 220 to the side frame portion 300, the door portions 210F, 210R, which are rotatably attached to the support portions 220, 220, can rotate smoothly. When the door portions 210F, 210R are closed, the side surface S of the transport cart 10 of the first embodiment can be blocked. Specifically, when the door portion 210F of the opening / closing portion 200 is closed, the side surface SF, which is formed by the side frame portion 300, the first outer frame 23 of the front frame portion 20, and the support portion 220, is blocked. Similarly, when the door portion 210R is closed, the side surface SR, which is formed by the side frame portion 300, the support portion 220, and the rear second outer frame 54, is blocked. In this way, when the opening / closing portion 200 is closed, the side surface S between the side frame portion 300, the front frame portion 20, and the rear frame portion 50 can be blocked. In this case, the door sections 210F and 210R are disposed parallel to the chassis 80.

[0036] Next, when the opening / closing part 200 is opened, the opening / closing part 200 overlaps with the intermediate part 83 in a plan view. Specifically, the door parts 210F, 210R of the opening / closing part 200 in the closed state open. At this time, in a plan view, the door parts 210F, 210R are arranged so as to be back-to-back in contact with each other, perpendicular to the chassis 80, and overlap with the intermediate part 83.

[0037] In addition, the intermediate platform 70 is disposed below the intermediate section 83, and the support sections 220, 220 of the opening / closing section 200 and the support platform 230 for erecting the support sections 220, 220 are also disposed so as to overlap the opening / closing section 200 and the intermediate platform 70 in a plan view. Therefore, when the door sections 210F, 210R are opened, the opening / closing section 200 and the intermediate platform 70 are disposed so as to overlap in a plan view. Also, as described above, there is a gap T between the opening / closing section 200 and the intermediate platform 70. Therefore, as will be described later, transport carts 10 in a nested state can be nested without interfering with each other. Furthermore, the transport cart 10 can be nested not only with the transport cart 10 of the first embodiment but also with conventional transport carts.

[0038] The method of using the transport cart 10 having the above configuration will be described. When the transport cart 10 having the above configuration is in use, the pallet 90 is rotated to be vertical. That is, the pallet 90 is positioned so that it leans against the rear frame portion 50. In this case, the intermediate wheels 72, 72 are positioned away from the floor G.

[0039] Next, when the opening / closing section 200 is opened from a state in which the side surface S of the transport cart 10 of the first embodiment is covered by the opening / closing section 200 (see FIG. 1), the opening / closing section 200 overlaps with the intermediate platform section 70 in a plan view. Specifically, when the door sections 210F, 210R of the opening / closing section 200 in the closed state are opened, the door sections 210F, 210R are arranged so as to be in contact with each other and perpendicular to the chassis 80 in a plan view, and so as to overlap with the intermediate platform section 70 in a plan view. This state is a nesting state suitable for so-called nesting of multiple transport carts 10.

[0040] A plurality of transport carts 10 in this nested state are nested. Each part of the transport carts 10 in the nested state will be described with reference to A, B, C, and D. Each member with reference to A indicates a part of the transport cart 10A, and similarly, each member with reference to B indicates a part of the transport cart 10B, and the same applies to C and D below.

[0041] The transport carts 10A, 10B, 10C, and 10D are nested. Specifically, they are arranged so that they are shifted to the right direction R.

[0042] In this case, the opening / closing units 200A, 200B, 200C, and 200D are arranged to overlap the intermediate base units 70A, 70B, 70C, and 70D in a plan view. Furthermore, there is a gap TA between the opening / closing unit 200A and the intermediate base unit 70A. Similarly, there is a gap TB between the opening / closing unit 200B and the intermediate base unit 70B. There is a gap TC between the opening / closing unit 200C and the intermediate base unit 70C. Furthermore, there is a gap TD between the opening / closing unit 200D and the intermediate base unit 70D.

[0043] When nesting multiple transport carts, the chassis 80A enters the gap TB, and the chassis 80B enters the gap TC, allowing multiple transport carts to be nested. In this way, the above-mentioned transport carts 10A, 10B, 10C, and 10D can be nested without interfering with each other. Furthermore, although not shown, they can also be nested with conventional transport carts.

[0044] Next, a transport cart 12 of a second embodiment will be described. The transport cart 12 of the second embodiment has a second fixing member 550 that fixes the door section 210F in the closed state, and a second fixed part 580 that comes into contact with and fixes the second fixing member 550. Similarly, the transport cart 12 has a second fixing member 550 and a third fixed part 590 in the door section 210R.

[0045] The second fixing member 550 preferably uses a magnet, specifically, product number MC-158 manufactured by Sugatsune Kogyo Co., Ltd. This is a well-known product in which a neodymium magnet is disposed in the center of a thin plate-like main body. The second fixed portion 580 is preferably made of metal and thin plate-like so that it can be attracted to the neodymium magnet.

[0046] Furthermore, the third fixed part 590 is preferably made of metal and has a thin plate shape so that it can be attracted to the neodymium magnet. Furthermore, the third fixed part 590 preferably has a larger area, i.e., a larger height and width, than the second fixed part 580. As described above, when the transport cart 10 having the above configuration is in use, the rod-shaped shaft 91 disposed inside the pipe 92 fixed to the rear frame 50 is rotatably arranged, and the pallet 90 is rotated around the rod-shaped shaft 91 disposed inside the pipe 92 to make it vertical. Then, when the pallet 90 is placed against the rear frame 50, the intermediate wheels 72, 72 are positioned away from the floor G, causing the third fixed part 590 to move up and down. In this way, in order for the third fixed part 590 to adhere to the second fixing member 550 within the range of its up and down movement, as described above, it is preferable that the area of ​​the third fixed part 590 be larger, i.e., the height and width be larger, than that of the second fixed part 580.

[0047] The second fixing members 550 are attached to two locations, one above and one below, on the vertical portions 211a of the square-shaped outer frame portion 211 of the door portion 210F. In addition, the second fixed portions 580 are attached to two locations, one above and one below, on the second outer frame 24, and these positions are arranged to coincide with each other.

[0048] The second fixing member 550 is attached to the vertical portion 211a of the square-shaped outer frame portion 211 of the door section 210R at two locations, one above the other. The third fixed portion 590 is attached to the rear first outer frame 53 at two locations, one above the other, and the positions of the two fixed portions are aligned. By arranging the second fixing member 550 and the second fixed portion 580, or the second fixing member 550 and the third fixed portion 590 in this manner, the door section 210F and the door section 210R can be maintained in a closed state. Although not shown, the second fixing member 550 and the second fixed portion 580 that fix the door section 210F in the closed state, as well as the second fixing member 550 and the third fixed portion 590 of the door section 210R, are also preferably arranged on the transport cart 10 of the first embodiment.

[0049] Furthermore, the transport cart 12 of the second embodiment differs from the transport cart 10 of the first embodiment in that it includes second locking units 600F, 600R that secure the door unit 210F or 210R in an open state and an engaging member 700 that engages with the second locking units 600F, 600R. Therefore, the transport cart 12 is otherwise substantially similar, and the same parts as those of the transport cart 10 of the first embodiment are designated by the same reference numerals, and their description may be omitted. The second locking units 600F, 600R are arranged to be suspended from the lower part 211b, which is located at the bottom of the square-shaped outer frame 211 of the door unit 210F. The second locking units 600F, 600R also include roller units 610F, 610R that are arranged to roll, and mounting units 620F, 620R to which the roller units 610F, 610R are respectively attached. The mounting portions 620F, 620R are literally for mounting the second locking portions 600F, 600R.

[0050] The above-described engaging member 700 is disposed at the base portion 231 of the support base portion 230. In a side view, the engaging member 700 has a first inclined portion 710F and a second inclined portion 710R that are inclined in a tapered shape, and a first groove portion 720F and a second groove portion 720R that are groove-shaped and disposed therebetween (see FIG. 16).

[0051] When an attempt is made to open the door part 210F, the roller part 610F of the second lock part 600F moves up the first inclined part 710F, which is tapered in side view, and drops into the first groove part 720F, where it engages with the first groove part 720F. As a result, the door part 210F is fixed to the support base part 230 in the open state.

[0052] Similarly, when an attempt is made to open the door section 210R, the roller section 610R of the second locking section 600R moves up the second inclined section 710R, which is tapered in side view, and drops into the second groove section 720R, engaging with the second groove section 720R. This secures the door section 210R to the support base 230 in an open state. Note that apart from the above configuration, the transport cart 12 of the second embodiment is identical to the transport cart 10 of the first embodiment, and the same parts are designated by the same reference numerals and their description will be omitted. Therefore, the so-called nesting operation is the same, and the transport cart 12 can be nested with the transport cart 10 of the first embodiment as well as with conventional transport carts.

[0053] In the transport cart 12 of the second embodiment having the above-described configuration, an operator (not shown) attempts to close the door section 210F at the front side of the drawing in FIG. 11, and therefore, by pushing the open door section 210F toward the depth of the drawing, the second fixing member 550 and the second fixed section 580 come into contact and are fixed, so the operator attempting to close the door section 210F does not need to go around to the depth side of the drawing in FIG. 11.

[0054] Next, when an operator (not shown) attempts to open the door section 210F, the operator pulls the door section 210F back toward the front of the drawing, which easily separates the second fixing member 550 from the second fixed portion 580, and the door section 210F opens. The operator (not shown) then pulls the door section 210F back toward the front of the drawing, and the roller section 610F of the first locking section 600F moves up the first inclined section 710F, which is inclined in a tapered shape in side view, and is dropped into the first groove section 720F, whereby the door section 210F in the open state is fixed to the support base section 230.

[0055] To close the door section 210F again, the roller section 610F that was dropped into the first groove section 720F is lifted up by lifting the door section 210F, thereby removing the roller section 610F from the first groove section 720F. From this point on, the above process is repeated. In this way, a worker (not shown) can perform the so-called nesting work on the front side of the drawings (see, for example, Figures 11 and 14), thereby improving work efficiency. The door section 210R can also be maintained in both the closed and open states by performing approximately the same operations. [Explanation of symbols]

[0056] 10 Transport cart 20 Front frame 22 First crosspiece 23 First outer frame 24 Second outer frame 21 Spindle 50 Rear frame 55 Front end 65 Rear end 70 Intermediate platform 80 chassis 83 Middle section 200 opening and closing section 210F, 210R door section 215 Locking Stick 220 Support part 230 Support part 240 Lock Plate 241 holes 300 Side frame 550 Second fixing member 580 2nd fixed part 590 3rd fixed part 600F, 600R second locking part 610F, 610R roller part 620F, 620R mounting part 700 Engagement member 710F 1st slope 710R 2nd slope section 720F First groove 720R Second groove T-gap

Claims

1. a front end portion for disposing a front frame portion; a rear end portion for disposing a rear frame portion at the rear; a chassis as a frame connecting the front end portion and the rear end portion, a middle portion of the chassis located midway between the front end portion and the rear end portion; an opening / closing portion that closes a side surface between the front frame portion and the rear frame portion, an intermediate base portion below the opening / closing portion, A gap is provided between the opening / closing section and the intermediate platform section, allowing the chassis of another transport vehicle to enter, The opening and closing section includes a door section for closing the side surface, a rod-shaped support portion that supports the door portion so that it can be opened and closed; a support base portion for erecting the support portion, The support base is a transport cart disposed in the intermediate portion.

2. A side frame portion connecting the front frame portion and the rear frame portion, The transporting cart according to claim 1 , wherein the side frame portions support the support portions.

3. A lock plate having a hole for fixing the door portion when the door portion is opened; The door portion has a lock rod that fits into the hole, 3. The transport cart according to claim 1, wherein the locking rod is fitted into the hole when the door is open, thereby fixing the door.

4. A second locking portion that fixes the door portion when the door portion is opened; an engaging member that engages with the second locking portion, The second locking portion is disposed on the chassis, 3. The transporting cart according to claim 1, wherein the engaging member is disposed on the door portion.

5. A second fixing member that fixes the door portion when the door portion is closed; a second fixed portion that comes into contact with and fixes the second fixing member, The second fixing member is disposed on the door portion, The transport cart according to claim 1 , wherein the second fixed portion is disposed on the front frame portion.

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