Stairway unloading trolley

Abstract

To provide a cargo-lifting cart for stairs having a simple structure and excellent operability. [Solution] This stair-accessible loading cart has a loading platform, a pair of rudder bars, one end of which is connected to each side of the loading platform, movable members provided below the front ends of each side of the loading platform, and fulcrum members, one end of which is connected to one of the pair of rudder bars at a position adjacent to the rear end of the loading platform. In this stair-accessible loading cart, the distance from the connection point of the fulcrum member with the rudder bars to the other end of the pair of rudder bars is longer than the distance from the connection point of the fulcrum member with the rudder bars to the center of the loading platform. The fulcrum member is pivotally supported by the pair of rudder bars on the underside of the loading platform so that it can rotate at least rearward.

Description

[Technical Field]

[0001] The present invention relates to a staircase loading cart used for loading cargo on stairs. [Background technology]

[0002] Conventionally, staircase carts have been used to carry loads up stairs. Some of these carts are equipped with a pair of casters with three wheels arranged on the same plane, while others have one wheel on each side and are designed to carry loads up stairs by utilizing structural and functional innovations (see, for example, Patent Document 1).

[0003] The cart in Patent Document 1 is configured so that an object to be lifted is placed on a loading platform located on the lower step of the stairs, and the handle is operated from the upper step of the stairs. The cart achieves movement of the wheels to the upper step by using a lever member and a boot connected to the free end of the lever member as a fulcrum. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2025-502234 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the cart described in Patent Document 1 has a complicated structure due to its mechanical structure, and the operation of lifting the load is also cumbersome. Therefore, there is a demand for a cart for stairs that has a simple structure and is easy to operate.

[0006] SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a cargo-lifting cart for stairs that has a simple structure and is easy to operate. [Means for solving the problem]

[0007] A stair-mounted cargo cart according to one embodiment of the present invention comprises a loading platform, a pair of rudder bar sections, one end of which is connected to each of the two sides of the loading platform, movable members respectively provided below the front ends of the two sides of the loading platform, and fulcrum members, one end of which is connected to one of the pair of rudder bar sections at a position adjacent to the rear end of the loading platform, wherein the distance from the connection point between the fulcrum member and the rudder bar sections to the other end of the pair of rudder bar sections is longer than the distance from the connection point between the fulcrum member and the rudder bar sections to the center of the loading platform, and the fulcrum member is supported by the pair of rudder bar sections so as to be able to rotate at least rearward on the back side of the loading platform. [Effects of the Invention]

[0008] The present invention comprises a pair of rudder bars, one end of which is connected to each side of the loading platform, two movable members provided below the loading platform, and a fulcrum member, one end of which is connected to the pair of rudder bars, wherein the distance from the connecting point of the fulcrum member to the other end of the pair of rudder bars is longer than the distance from the connecting point of the fulcrum member to the center of the loading platform. The fulcrum member is pivotally supported by the pair of rudder bars on the underside of the loading platform so that it can rotate at least rearward. Therefore, excellent operability can be achieved with a simple structure. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view illustrating a staircase cargo cart according to an embodiment of the present invention; [Figure 2] 2 is a plan view of the staircase cargo carrier of FIG. 1 as seen from above. [Figure 3] FIG. 2 is a side view of the staircase cargo carrier of FIG. 1 as seen from the side. [Figure 4] 2 is an explanatory diagram illustrating a state in which the staircase cargo-lifting cart of FIG. 1 is set on the stairs and an object to be lifted is placed on the loading platform. [Figure 5] 5 is an explanatory diagram illustrating the staircase cargo carrier of FIG. 1 in a state where the other ends of the pair of rudder bars are lowered from the state of FIG. 4. FIG. [Figure 6]6 is an explanatory diagram illustrating the staircase cargo lifting cart of FIG. 1 in a state in which the other end of the pair of rudder bars is raised from the state of FIG. 5 and the movable member is placed on the tread portion. [Figure 7] 7 is an explanatory diagram illustrating the staircase cargo lifting cart of FIG. 1 in a state in which the other end of the pair of rudder bars is further raised from the state of FIG. 6 to raise the fulcrum member. FIG. [Figure 8] 8 is an explanatory diagram illustrating the state in which the other end of the pair of rudder bars of the staircase cargo lifting truck of FIG. 1 is further raised from the state of FIG. 7 and the truck is moving forward. [Figure 9] 9 is an explanatory diagram illustrating the state of the staircase cargo lifting cart of FIG. 1 in which the front end of the cart abuts on the rise of the stairs from the state of FIG. 8.

[0023] FIG. [Figure 10] 1 in a state (initial state) in which the other end of the pair of rudder bars is lowered from the state in FIG. 9 so that the lower end of the fulcrum member is placed on the tread portion. [Figure 11] 10. FIG. 11 is an explanatory view illustrating the staircase cargo carrier of FIG. 1 in a state where the other ends of the pair of rudder bars are lowered from the state of FIG. [Figure 12] 12 is an explanatory diagram illustrating the state in which the other end of the pair of rudder bars is raised from the state in FIG. 11 to place the movable member on the tread portion and raise the fulcrum member in the air, in the staircase cargo hoist truck of FIG. 1. [Figure 13] 13 is an explanatory diagram illustrating the state in which the other end of the pair of rudder bars of the staircase cargo lifting truck of FIG. 1 is further raised from the state of FIG. 12 and the truck is moving forward. FIG. [Figure 14] 14 is an explanatory diagram illustrating the state in which the other end of the pair of rudder bars has been lowered and the lower end of the fulcrum member has been placed on the tread portion of the staircase cargo hoist truck of FIG. 1 after passing through the state of FIG. 13. [Figure 15] 2 is a flowchart illustrating a flow of a lifting operation using the stair lifting cart of FIG. 1. [Figure 16] FIG. 1 is a side view partially showing an example of a staircase cargo truck according to a first modified example of an embodiment of the present invention. [Figure 17] 17 is a side view illustrating the fulcrum member of FIG. 16 in a naturally hanging state. FIG. [Figure 18]FIG. 10 is an explanatory diagram illustrating a state in which the staircase cargo hoisting cart according to the first modified embodiment of the present invention is set on stairs. [Figure 19] FIG. 10 is a side view partially showing another example of the staircase cargo cart according to the first modified example of the embodiment of the present invention. [Figure 20] FIG. 10 is a side view partially showing an example of a staircase cargo carrier according to a second modified example of an embodiment of the present invention. [Figure 21] FIG. 10 is an explanatory diagram illustrating a state in which a staircase cargo hoisting cart according to a second modified embodiment of the present invention is set on stairs. [Figure 22] FIG. 10 is a side view partially showing another example of the staircase cargo cart according to the second modified example of the embodiment of the present invention. [Figure 23] 1 is a perspective view showing the configuration of one example of a staircase cargo cart according to an embodiment of the present invention. [Figure 24] 24 is a perspective view of the staircase cargo cart of FIG. 23 as seen from another direction. [Figure 25] 24 is a perspective view of the staircase cargo carrier of FIG. 23 as seen from another direction. [Figure 26] 24 is a perspective view illustrating a state in which the fulcrum member of FIG. 23 abuts against the front restraining member. FIG. [Figure 27] 24 is a perspective view illustrating a state in which the fulcrum member of FIG. 23 abuts against a rear limiting member. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 to 27, a description will be given of an example of the configuration and operation (example of operation) of the staircase cargo truck 100 according to the embodiment. The three directions shown in each figure correspond to the orientation of the staircase cargo truck 100 when in use, with the x-axis direction being the left-right direction, the y-axis direction being the front-to-back direction, and the z-axis direction being the up-to-down direction. In particular, the positive x-axis direction is the right side, the positive y-axis direction is the front side, and the positive z-axis direction is the up side. While these directions do not necessarily correspond to the actual state of the staircase cargo truck 100 during transportation, for convenience, the following description will explain the arrangement and structure of each component in relation to these directions. In each figure, some reference numerals have been omitted as appropriate to avoid cluttering the drawings.

[0011] First, with reference to Figures 1 to 3, an example of the configuration of a staircase cargo hoisting dolly 100 (hereinafter also referred to as "cart 100") according to an embodiment will be described. In Figures 1 to 3, some of the components are colored gray, but this is a convenient device to make it easier to visually distinguish between the components and has no relation to their actual colors. The dolly 100 has a loading platform 10, a pair of rudder bars 20 connected at one end to each side of the loading platform 10, movable members 30 provided below the front ends of both sides of the loading platform 10, and fulcrum members 40 connected to the pair of rudder bars 20.

[0012] The loading platform 10 of this embodiment is a plate-like member formed into a rectangular shape in a plan view. In the example of Figures 1 to 3, one side of the loading platform 10 is fixed to the upper part of one end of one rudder bar 20, and the other side is fixed to the upper part of the other end of the other rudder bar 20. Of course, both sides of the loading platform 10 may be fixed to the lower or side parts of the pair of rudder bars 20, but in consideration of the fixing strength, ease of placing an object to be lifted (hereinafter also simply referred to as "object"), stability, etc., it is preferable to fix them to the upper parts of the pair of rudder bars 20.

[0013] The dolly 100 in Figures 1 to 3 has cargo fall prevention units (15a, 15b) provided at the front and rear ends of the loading platform 10. The cargo fall prevention unit provided at the front end of the loading platform 10 is referred to as the front fall prevention unit 15a, and the cargo fall prevention unit provided at the rear end of the loading platform 10 is referred to as the rear fall prevention unit 15b. Hereinafter, when there is no need to distinguish between the front fall prevention unit 15a and the rear fall prevention unit 15b, they will be referred to as the "cargo fall prevention unit." In the examples of each figure, the cargo fall prevention units are attached to the surface of the loading platform 10.

[0014] Each of the pair of rudder bar sections 20 is formed in a rod shape. It is preferable that the rudder bar section 20 is formed so that at least the side fixed to the loading platform section 10 is flat. Each figure shows an example of a rudder bar section 20 that is rectangular in cross section. It is preferable that the length T2 of the rudder bar section 20 along the fore-and-aft direction be longer than the length T1 of the loading platform section 10 along the fore-and-aft direction, and more preferably be at least twice the length T1.

[0015] The movable member 30 is attached to the rudder bar section 20 or the loading platform section 10 below the front ends of both sides of the loading platform section 10. That is, the movable member 30 may be attached to the front end of each of the pair of rudder bar sections 20, or to both sides at the front end of the loading platform section 10. However, depending on the joining state between the loading platform section 10 and the rudder bar sections 20, the movable member 30 may be attached straddling the front end of the loading platform section 10 and the front end of the rudder bar sections 20. Alternatively, an auxiliary base for attaching the movable member 30 may be provided adjacent to the front end of the rudder bar section 20, and the movable member 30 may be attached to the auxiliary base or straddling the auxiliary base and the front end of the rudder bar section 20.

[0016] The movable member 30 is configured, for example, by a caster including a wheel. Although a swivel caster (swivel wheel), an omniwheel, a ball caster, or the like can be adopted as the movable member 30, a fixed caster (fixed wheel) in which the direction of the wheels is fixed is more preferable. The fixed caster as the movable member 30 is fixed so that the direction of the wheels (the direction of rotation of the wheels) is parallel to the front-to-rear direction.

[0017] The fulcrum member 40 has one end connected to the pair of rudder bar sections 20 at a position adjacent to the rear end of the platform section 10. Adjacent here does not include a state in which the rear end of the platform section 10 and the upper end of the fulcrum member 40 are in contact with each other, but the distance d between the rear end of the platform section 10 and the front end of the upper end of the fulcrum member 40 in a plan view may be set arbitrarily within a range of approximately 0 cm to 10 cm, depending on the overall size of the bogie 100. The bogie 100 may be configured so that the distance d in a plan view is 0 cm if the fulcrum member 40 does not interfere with the platform section 10.

[0018] The fulcrum member 40 is pivotally supported by the pair of rudder bars 20 on the underside of the platform 10 so as to be able to rotate at least rearward. More specifically, one end of the fulcrum member 40 is connected to the pair of rudder bars 20 via a rotation shaft 51. The fulcrum member 40 is not limited to a dense structure overall, and various structures can be employed. For example, the fulcrum member 40 may be hollow, or may be configured with plate-like or rod-like members arranged on both sides, the front end, the rear end, and the bottom. In the latter case, the horizontal cross-section of the fulcrum member 40 at its vertical center will be U-shaped (concave). Alternatively, the fulcrum member 40 may be formed into a plate by arranging multiple square timbers.

[0019] The rotating shaft 51 is formed in a cylindrical or columnar shape, and both ends are sandwiched between support members 50 attached to each of the pair of rudder bar sections 20. However, the attachment structure of the rotating shaft 51 is not limited to the examples shown in the figures, and any structure can be used as long as it can rotatably support the fulcrum member 40.

[0020] The dolly 100 of this embodiment has a rod-shaped grip 60 provided at the other end of the pair of rudder bar sections 20 so as to connect one rudder bar section 20 to the other rudder bar section 20. In other words, the grip 60 is provided so as to bridge from one rudder bar section 20 to the other rudder bar section 20. When using the dolly 100 to lift a load up stairs, the user will raise and lower the other ends of the pair of rudder bar sections 20, and the grip 60 is the part that is gripped by the user in doing so and functions as a so-called operating handle.

[0021] The distance (length) Tb from the connection point between the fulcrum member 40 and the rudder bar sections 20 to the other end of the pair of rudder bar sections 20 is longer than the distance (length) Ta from the connection point between the fulcrum member 40 and the rudder bar sections 20 to the center of the platform section 10. The relationship between the distance Tb and the distance Ta can be freely changed according to the weight and shape of the object. In order to reduce the force applied to the other end of the pair of rudder bar sections 20 (the grip section 60 in the configuration examples of the figures) to a certain extent during operation, the trolley 100 should be configured so that the distance Tb is at least twice the distance Ta.

[0022] When placing an object, it is ideal for the center of the platform 10 and the center of gravity of the object to coincide in a plan view. However, in reality, objects have various shapes and structures, and the center of gravity is not necessarily located in the center. Furthermore, precise positioning is difficult through manual work. In this regard, if the distance Tb is configured to be at least twice the distance Ta, at least the advantage of the "leverage principle" can be obtained. However, the cart 100 may be configured so that the distance Tb is at least three, four, or five times the distance Ta, as long as the overall strength can be ensured.

[0023] In other words, the cart 100 should be configured so that the distance (length) Tc from the center of the rotating shaft 51 to the center of the gripping portion 60 is at least twice the distance Ta from the center of the rotating shaft 51 to the center of the platform portion 10. The cart 100 may also be configured so that the distance Tc is at least three, four, or five times the distance Ta, as long as the overall strength can be ensured.

[0024] The bogie 100 has rear limiting members 72 attached to the pair of rudder bars 20, which limit the rearward rotation of the fulcrum member 40 to a set angle (rearward limiting angle θm). That is, the rear limiting member 72 is positioned so that the upper limit of the rearward rotation angle θ (see FIGS. 7 and 12) of the fulcrum member 40 is the rear limiting angle θm (see FIGS. 5, 6, and 11). The rear limiting angle θm is set based on the lengths of the risers K and treads F of the stairs S where the load is to be lifted, etc. The rear limiting angle θm is determined by the distance Cb between the upper rear end of the fulcrum member 40, which is in a state perpendicular to the pair of rudder bars 20 (hereinafter referred to as the "vertical state"), and the front end of the rear limiting member 72, as well as the height of the front end of the rear limiting member 72, etc.

[0025] For example, the rear limiting member 72 is positioned so that the rear limiting angle θm is 10 degrees or more and 45 degrees or less. However, the rear limiting member 72 may be positioned so that the rear limiting angle θm is less than 10 degrees, or so that the rear limiting angle θm is greater than 45 degrees. The cart 100 is likely to be suitable for general stairs if it is configured so that the rear limiting angle θm is 20 degrees or more and 35 degrees or less. The cart 100 may have an elastic member (not shown) that absorbs the impact when the fulcrum member 40 hits the rear limiting member 72. The elastic member may be provided at the rear end of the fulcrum member 40 or the front end of the rear limiting member 72.

[0026] The bogie 100 is provided with a pair of front restraining members 71 attached to the pair of rudder bars 20, which restrain the forward rotation of the fulcrum member 40. Here, "restraining" includes not only completely preventing the forward rotation of the fulcrum member 40, but also allowing the forward rotation of the fulcrum member 40 to some extent. More specifically, the front restraining member 71 is positioned so that the upper limit of the forward rotation angle α of the fulcrum member 40 is a front restraining angle (not shown). The front restraining angle is preferably set to an angle smaller than the rear restraining angle θm. The front restraining angle is set based on factors such as the length of the risers K and treads F of the staircase S where the load is to be lifted. The front restraining angle is determined by factors such as the distance Ca between the front end of the upper part of the fulcrum member 40 in a vertical position and the rear end of the front restraining member 71, and the height of the rear end of the front restraining member 71.

[0027] For example, the front restraining member 71 is positioned so that the front limiting angle is between 0 degrees and 10 degrees. The bogie 100 may be provided with an elastic member (not shown) that absorbs the impact when the fulcrum member 40 hits the front restraining member 71. The elastic member may be provided at the front end of the fulcrum member 40 or the rear end of the front restraining member 71. If an elastic member is provided between the fulcrum member 40 and the front restraining member 71, the distance Ca is set according to the thickness of the elastic member, and even when the front limiting angle is approximately 0 degrees, the distance Ca is ensured to a certain extent. Note that the structure is permissible even if the front limiting angle becomes a slightly negative angle.

[0028] The bogie 100 has reinforcing members 25 fixed to one rudder bar section 20 and the other rudder bar section 20. The reinforcing members 25 are intended to increase the operational stability of the bogie 100. While each figure illustrates a rod-shaped reinforcing member 25, the reinforcing member 25 may be a plate-shaped member, or may be a combination of a rod-shaped member and a plate-shaped member, for example. Each figure illustrates an example in which the reinforcing member 25 is fixed to the lower surfaces of the pair of rudder bar sections 20, but this is not limiting, and the reinforcing member 25 may also be fixed to the upper surfaces of the pair of rudder bar sections 20, or may be provided between the pair of rudder bar sections 20.

[0029] In the trolley 100, the rear ends of the pair of rudder bars 20, i.e., the position of the gripping parts 60, serve as the point of force, the connecting point of the fulcrum member 40, i.e., the position of the pivot shaft 51, serves as the appropriate fulcrum, and the position of the center of gravity of the object on the loading platform 10 serves as the point of action. Here, we will consider the force moment around the fulcrum, assuming that a 150 kg object is to be lifted using a trolley 100 with a length T2 of 300 cm, a distance Tc of 210 cm, and a distance Ta of 40 cm.

[0030] Assuming that the center of gravity of the object coincides with the center of the loading platform 10, the torque (total force) at the center of the loading platform 10 is 6000 (150 kg × 40 cm). Therefore, the force (total force required) that must be applied to the gripping unit 60 to lift the object is equivalent to approximately 28.57 kg (6000 ÷ 210), and when the cart 100 is operated by two people, the force per person is equivalent to 14.3 kg (28.57 ÷ 2). In other words, under this assumption, the object can be lifted with a force per person that is less than 1 / 10 of the weight of the object.

[0031] Generalizing the above, when two people lift an object of weight Z, the force per person is expressed as in the following formula (1).

[0032]

number

[0033] Next, a method of operating the cart 100 will be described with reference to Figures 4 to 13. The cart 100 can be operated by one person, but when lifting relatively heavy objects such as stone, it is recommended that it be operated by two or more people. When two users are operating it, each user should split into one user on one side of the rudder bar section 20 and the other user on the other side of the rudder bar section 20 and operate it by grasping the grip section 60.

[0034] 4 shows an example of a state in which the cart 100 is set on a staircase S and an object M is placed on the loading platform 10. Once the staircase S to which the load is to be lifted has been determined, it is possible to determine the distance (length) Td from the front end of the loading platform 10 to the connection point of the fulcrum member 40 (the center of the pivot shaft 51) and the length H from the lower ends of the pair of rudder bar members 20 to the lower end of the fulcrum member 40 based on the height of the riser K of the staircase S and the length in the front-to-rear direction of the tread F. Note that the length H is necessarily determined by determining the length of the fulcrum member 40.

[0035] In the initial state before starting to lift a load, the dolly 100 is configured so that, for example, the front end of the platform 10 or the rudder bar 20 (hereinafter also referred to as the "front end of the dolly") abuts against the riser K of a certain step, the movable member 30 is positioned in front of the tread F of the step below, and the lower end of the fulcrum member 40 is positioned behind the tread F of the step two steps below the one of the movable member 30 (or on the ground G or a special scaffolding). At this time, it is preferable that the pair of rudder bar members 20 are approximately horizontal and the fulcrum member 40 is approximately perpendicular to the tread F. However, in the initial state, the user is supporting the other end of the rudder bar member 20 and a weight is applied to the movable member 30, so the lifting operation can begin as long as the lower end of the fulcrum member 40 is resting on the tread F. If there are no operational constraints, operation of the trolley 100 may begin with the lower end of the fulcrum member 40 in contact with the ground G, or a special scaffolding may be provided and operation may begin with the lower end of the fulcrum member 40 placed on the scaffolding.

[0036] When the rear end of the rudder bar 20 is lowered from the state shown in FIG. 4, the fulcrum member 40 rotates rearward, and the movable member 30 moves diagonally upward and forward, as shown in FIG. 5. The forward movement of the movable member 30 is caused by the rearward rotation of the fulcrum member 40. During this operation, the user may apply a forward force while lowering the rear end of the rudder bar 20 to encourage the rearward rotation of the fulcrum member 40. At this time, the movable member 30 is positioned above the step F of the step one step above the one it was standing on in the state shown in FIG. 4. Specifically, if the lower end of the wheel of the movable member 30 is positioned above the step F, the next operation can be carried out smoothly.

[0037] When the rear end of the rudder bar 20 is raised slightly upward from the state shown in FIG. 5, the movable member 30 rests on the tread F below, as shown in FIG. 6. When the rear end of the rudder bar 20 is raised further, the lower end of the fulcrum member 40 comes off the tread F, as shown in FIG. 7. At this time, the fulcrum member 40 rotates forward due to its own weight. When the rear end of the rudder bar 20 is raised further from there, the wheels of the movable member 30 naturally rotate forward, as shown in FIG. 8, and the bogie 100 begins to move forward. Then, the bogie 100 moves forward until the front end of the bogie abuts against the riser K, as shown in FIG. 9.

[0038] When the rear end of the rudder bar 20 is lowered from the state shown in FIG. 9, the lower end of the fulcrum member 40 comes into contact with the tread F, as shown in FIG. 10, and the load is distributed to the fulcrum member 40. The cart 100 in FIG. 10 is in a state where it has climbed exactly one step up the stairs S from the initial state shown in FIG. 4. This state in which the cart 100 is in a position similar to the initial state and begins to lift the next step is hereinafter referred to as the "initial state." By repeating the series of operations described above based on FIGS. 4 to 10, the user can use the cart 100 to carry the object M up one step at a time.

[0039] Incidentally, the above explanation illustrates the flow of operations in which the front end of the bogie abuts against the riser K (see Figure 9) and then the rear end of the rudder bar section 20 is lowered (see Figure 10). However, when the state shown in Figure 8 is reached, the bogie 100 continues to move forward due to inertia, so it is also possible to start lowering the rear end of the rudder bar section 20 before the front end of the bogie abuts against the riser K.

[0040] The method for fastening the components of the trolley 100 together may be determined depending on the materials used. For example, if the trolley 100 is manufactured using wood as the main material, the components may be connected using bolt and nut combinations, screws, etc. If the trolley 100 is manufactured using metal (stainless steel, light metal, etc.) as the main material, the components may be joined together using bolt and nut combinations, welding, etc. If the trolley 100 is manufactured using high-strength plastic such as engineering plastic as the main material, the components may be joined together using bolt and nut combinations, welding, fusion, etc. However, the trolley 100 may also be manufactured using a combination of multiple materials, such as wood, metal, and engineering plastic.

[0041] Next, the flow of the lifting operation using the dolly 100 will be explained with reference to the explanatory diagrams in Figures 10 to 14 and the flowchart in Figure 15, focusing on the actions of the user. Note that Figures 10 to 13 correspond to the flow of the operation following Figures 4 to 9, and show the same operations as Figures 4 to 9, but here the explanation will be given assuming Figure 10 as the initial state. This is because it is not necessary to start lifting from the lowest level.

[0042] For example, as shown in FIG. 10, a user places the cart 100 on a staircase S and places an object M on the loading platform 10 (step S101). Next, the user lowers the rear end of the rudder bar 20 downward as shown in FIG. 11. This causes the fulcrum member 40 to rotate rearward, and the movable member 30 to move diagonally upward and forward (step S102). Next, the user raises the rear end of the rudder bar 20 upward as shown in FIG. 12. This causes the movable member 30 to rest on the tread member F below, after which the lower end of the fulcrum member 40 disengages from the tread member F, a forward force acts on the movable member 30, and the cart 100 moves smoothly forward until the front end of the cart abuts against the riser K as shown in FIG. 13 (step S103).

[0043] Next, as shown in FIG. 14, the user lowers the rear end of the rudder bar 20 until the lower end of the fulcrum member 40 abuts against the tread portion F (step S104, step S105 / No). As a result, the lower end of the fulcrum member 40 abuts against the tread portion F, and the cart 100 enters the initial movement state (step S105 / Yes). At this time, if the movable member 30 of the cart 100 has not reached the target step (step S106 / No), the user repeats the series of operations of steps S102 to S105. Note that the target step is not limited to the top step of the staircase S. If the movable member 30 of the cart 100 has reached the target step (step S106 / Yes), the user or the like removes the object M from the platform 10, and the operation of lifting the object M is completed (step S107). In this way, by using the carriage 100, the load can be smoothly lifted one level at a time by repeating the three simple steps of "lowering, raising and lowering" the rear end of the rudder bar portion 20.

[0044] As described above, the bogie 100 in this embodiment has a pair of rudder bar sections 20, one end of which is connected to each side of the bed section 10, movable members 30 provided below the front ends of each side of the bed section 10, and a fulcrum member 40, one end of which is connected to the pair of rudder bar sections 20. In the bogie 100, the distance Tb from the connecting point of the fulcrum member 40 to the other end of the pair of rudder bar sections 20 is longer than the distance Ta from the connecting point of the fulcrum member 40 to the center of the bed section 10. The fulcrum member 40 is pivotally supported by the pair of rudder bar sections 20 on the back side of the bed section 10 so as to be able to rotate at least rearward. Therefore, when the movable member 30 is placed on the tread of an upper staircase and the fulcrum member 40 is positioned, for example, on the lower staircase, lowering the other ends of the pair of rudder bars 20 causes the fulcrum member 40 to rotate backward, and the connection point of the fulcrum member 40 and the movable member 30 move diagonally upward and forward, resulting in the movable member 30 being positioned above the next step. Here, when the other ends of the pair of rudder bars 20 are raised, the movable member 30 moves forward on the next step. Further lowering the other ends of the pair of rudder bars 20 places the fulcrum member 40 on the tread of the next step. By repeating the above simple actions, a user can smoothly lift a load up and down stairs. In other words, the trolley 100 achieves excellent operability with a simple structure.

[0045] The dolly 100 may be configured so that, in a side view, the distance Tb from the connection point between the fulcrum member 40 and the rudder bar sections 20 to the other end of the pair of rudder bar sections 20 is at least twice the distance Ta from the connection point between the fulcrum member 40 and the rudder bar sections 20 to the center of the platform section 10. In this way, the distance from the fulcrum to the point of application is at least twice the distance from the fulcrum to the point of force, so the force required for operation is equivalent to less than half the weight of the object, and when operated by two users, it is equivalent to less than one-quarter of the weight of the object, allowing for efficient lifting with little force.

[0046] The dolly 100 may have a rod-shaped grip 60 at the other end of the pair of rudder bars 20, connecting one rudder bar 20 to the other rudder bar 20. This improves user operability and increases the connecting force at the rear ends of the pair of rudder bars 20, thereby improving operational stability. When the dolly 100 has the grip 60, the grip 60 functions as a force point. Therefore, taking into account that the fulcrum member 40 is connected to the pair of rudder bars 20 via the pivot shaft 51, the preferable relationship between the fulcrum, force point, and point of action can be summarized as follows: That is, the dolly 100 should be configured so that, in a side view, the distance Tc from the center of the pivot shaft 51 to the center of the grip 60 is at least twice the distance Ta from the center of the pivot shaft 51 to the center of the platform 10.

[0047] The carriage 100 may have a rear limiting member 72 that limits the rearward rotation of the fulcrum member 40 to within a set angle (rear limit angle θm). With this configuration, for example, when performing the operation from FIG. 4 to FIG. 5 and the operation from FIG. 10 to FIG. 11, excessive rearward rotation of the fulcrum member 40 can be prevented, thereby reducing the amount by which the user lowers the other end of the rudder bar unit 20. In addition, the load of the object can be stably supported by the fulcrum member 40, thereby reducing the workload on the user.

[0048] The cart 100 may have a front restraining member 71 that restrains the fulcrum member 40 from rotating forward. By adopting such a configuration, unnecessary forward rotation of the fulcrum member 40 can be prevented in the initial state or in the initial movement state (see FIGS. 4 and 10), and the object can be stably supported. Furthermore, during the operations shown in FIGS. 8 to 10 and the operations shown in FIGS. 13 to 14, the fulcrum member 40 can be prevented from falling forward and resting on the tread portion F, so the weight of the object can be supported more stably, and the user can perform the next operation more smoothly.

[0049] The dolly 100 may have load drop prevention parts (15a, 15b) provided at the front and rear ends of the loading platform 10. In this way, even if an object is displaced on the loading platform 10, it is possible to prevent the object from falling, thereby increasing safety and improving work efficiency.

[0050] <Variation 1> A description will be given of a cart (stair lifting cart) according to a first modified example of the embodiment of the present invention with reference to Figures 16 to 19. The cart of this first modified example is characterized by the mounting position of the fulcrum member and the shape and structure thereof, but its basic configuration is the same as the configuration example of Figures 1 to 14. Therefore, the cart of this modified example and its respective components are given the same reference numerals as the configuration example of Figures 1 to 14, and their description will be omitted or simplified.

[0051] The bogie 100 of the present modified example 1 employs a structure (hereinafter also referred to as an "eccentric structure") in which, in a side view, the center of gravity g of the fulcrum member 40 is located forward of an axial line J, which is a straight line that passes through the center of the rotating shaft 51 and is parallel to the extension direction of the fulcrum member 40. The extension direction of the fulcrum member 40 is the direction from the connection point with the rudder bar unit 20 toward the lower end of the fulcrum member 40, and is hereinafter also simply referred to as the "extension direction" (see the outline arrow in Figure 16, etc.). In other words, the bogie 100 is configured such that a center line O, which is a straight line that passes through the center of gravity g of the fulcrum member 40 and is parallel to the extension direction, is located forward of the axial line J. In other words, the rotating shaft 51 is disposed so that the axial line J is shifted rearward from the center line O by an eccentric length k. The eccentric length k can be set arbitrarily.

[0052] FIG. 16 is a side view partially illustrating an example of a bogie 100 according to the first modified example. The bogie 100 in FIG. 16 has an eccentric structure in which the center of the pivot shaft 51 is positioned rearward of the center line O. In the case of the bogie 100 employing the eccentric structure, when the pair of rudder bars 20 are held horizontal and the fulcrum member 40 is allowed to hang naturally without any force being applied to it, the fulcrum member 40 stops in a position where it has rotated rearward, as shown in FIG. 17. The rotation angle θ at this time is determined by the positions of the center of the pivot shaft 51 and the center of gravity g, etc. Therefore, in the initial state or initial movement state (see FIGS. 4 and 10), a rearward force acts on the lower end of the fulcrum member 40, and as a reaction to this force, a forward force acts on the pair of rudder bars 20 at the pivot shaft 51, as shown in FIG. 18. Therefore, when the rear ends of the rudder bar sections 20 are lowered from the initial state or initial movement state (see FIGS. 4 to 5, 10 to 11), a forward force is already being applied to the pair of rudder bar sections 20, so the pair of rudder bar sections 20 can be moved forward more naturally. This allows the user to more smoothly perform the operation in step S102 in FIG. 15.

[0053] 16 and 17 show an example in which the center of gravity g of the fulcrum member 40 coincides with the center of the fulcrum member 40 in the front-to-rear direction in side view for the sake of convenience of explanation, but this is not limiting. The fulcrum member 40 can have a variety of structures and can be manufactured by combining a variety of materials, so the center of gravity g of the fulcrum member 40 does not necessarily coincide with the center of the fulcrum member 40 in the front-to-rear direction in side view. In other words, the center of gravity g of the fulcrum member 40 may be shifted forward or rearward from the center in the front-to-rear direction.

[0054] However, the bogie 100 of the present modified example 1 may have an eccentric structure in which the center of gravity g of the fulcrum member 40 is located forward of the axis line J by changing the structure of the fulcrum member 40 without shifting the center position of the rotation shaft 51 from the center of the fulcrum member 40 in the fore-and-aft direction. For example, the fulcrum member 40 may have an eccentric structure by making the specific gravity of the material in the front portion greater than that of the material in the rear portion, by providing a space or gap in the rear region, by providing a cutout portion (notch) on the rear side of the lower end portion, or by combining at least two of these methods. When the specific gravity of the material of the fulcrum member 40 is partially changed, using a material with a relatively high specific gravity for at least the front portion of the lower end portion allows the center of gravity g to be efficiently moved forward.

[0055] Fig. 19 is a side view partially showing another example of the bogie 100 according to the present modified example 1. The fulcrum member 40 in Fig. 19 is an example in which a notched portion (cutout portion) is provided on the rear side of the lower end portion. The fulcrum member 40 is pivotally supported by a pair of rudder bars 20 on the back side of the platform 10 so as to be able to rotate at least rearward.

[0056] More specifically, the fulcrum member 40 has a base 41, one end of which is connected to the pair of rudder bars 20 via a pivot shaft 51, and a support portion 42, which is connected to the other end of the base 41. In a side view of the fulcrum member 40, the front-to-rear width of the support portion 42 is shorter than the front-to-rear width of the base 41. While FIG. 19 shows an example in which the front ends of the base 41 and the support portion 42 are flush with each other, the fulcrum member 40 may have a recess formed in the front portion of the lower end. The fulcrum member 40 may have a generally solid structure or a hollow structure, and may be configured with plate-like or rod-like members disposed on both sides, the front end, the rear end, and the bottom. However, at least the notch prevents the center of gravity g from shifting forward. The shape of the notch is not limited to a stepped shape, and various shapes, such as a curved shape, may be used.

[0057] 17, when the fulcrum member 40 is allowed to hang naturally, the fulcrum member 40 also stops in a state where it has rotated rearward. Therefore, in the initial state or initial movement state, the lower end of the fulcrum member 40 receives a rearward force from the tread portion F, and as a reaction to this force, a forward force acts on the pivot shafts 51 of the pair of rudder bar portions 20. Therefore, when the rear end of the rudder bar portion 20 is lowered from the initial state or initial movement state, the forward movement of the rudder bar portion 20 is promoted, and the user can more smoothly perform the operation of step S102 in FIG. 15.

[0058] 19, the rear edge E of the lower end of the support part 42 is contained within the region R formed by extending the pivot shaft 51 along the extension direction of the fulcrum member 40. Therefore, for example, during the initial state, the initial movement state, and the operations before and after, the force applied to the connection point (the pivot shaft 51) with the pair of rudder bar parts 20 can be efficiently and stably supported by the fulcrum member 40, thereby improving the stability of the lifting operation. For convenience, the region R is shaded in FIG. 16. Other configurations and alternative configurations and structures of the bogie 100 of this modified example 1 are the same as those of the configuration examples described with reference to FIGS. 1 to 15.

[0059] As described above, the bogie 100 of this first modified example is configured so that the center of gravity g of the fulcrum member 40 is located forward of the axis line J in a side view. Therefore, in the initial state or initial movement state, a forward force acts on the pivot shafts 51 of the pair of rudder bar sections 20 due to the reaction of the rearward force acting on the lower end of the fulcrum member 40. Therefore, when the rear ends of the rudder bar sections 20 are lowered from the initial state or initial movement state, the pair of rudder bar sections 20 naturally move forward, thereby improving operability for the user. However, the bogie 100 of this first modified example can also achieve the various effects described using Figures 1 to 15, etc.

[0060] 1 to 15 , the eccentric structure of Modified Example 1 can be incorporated into the bogie 100 by simply modifying the structure of the fulcrum member 40, without shifting the center position of the pivot shaft 51 from the center in the front-to-rear direction of the fulcrum member 40. The eccentric structure of the bogie 100 may be realized by combining a technique for shifting the center position of the pivot shaft 51 from the center in the front-to-rear direction of the fulcrum member 40 with a structural modification of the fulcrum member 40.

[0061] <Variation 2> 20 to 22, a description will be given of a cart (stair lifting cart) according to Modification 2 of the embodiment of the present invention. Although the cart of Modification 2 is characterized by the shape and structure of its fulcrum member, its basic configuration is similar to the configuration examples of Figures 1 to 14 and 16 to 19. Therefore, the cart of Modification 2 and its respective components will be given the same reference numerals as those in the configuration examples of Figures 1 to 14 and 16 to 19, and their description will be omitted or simplified.

[0062] In the bogie 100 of the second modified example, the front portion of the lower end of the fulcrum member 40 is recessed in the shape of a notch. That is, as illustrated in Fig. 20, the fulcrum member 40 has a notch C formed in the front portion of the lower end. More specifically, the fulcrum member 40 has a base 41 having one end connected to the pair of rudder bar sections 20 via a rotating shaft 51, and a support section 42 connected to the other end of the base 41. In a side view of the fulcrum member 40, the width n in the front-to-rear direction of the support section 42 is shorter than the width m in the front-to-rear direction of the base 41.

[0063] In a side view of the fulcrum member 40, it is preferable that the distance p from a line along the rear end of the base 41 to the front end of the support portion 42 is less than one-half of the width m of the base 41 in the front-to-rear direction. In other words, in a side view of the fulcrum member 40, it is preferable that the distance q from the front end of the support portion 42 to a line along the front end of the base 41 is at least one-half of the width m of the base 41 in the front-to-rear direction. In the fulcrum member 40 illustrated in FIG. 20, the rear end of the base 41 and the rear end of the support portion 42 are flush with each other, so the distance p is equal to the width n of the support portion 42. If the width n of the support portion 42 of the fulcrum member 40 is too short, the strength of the fulcrum member 40 may be insufficient. Therefore, it is preferable that the width n of the support portion 42 is at least one-fifth of the width m of the base 41, for example. As long as strength can be ensured, the distance p of the fulcrum member 40 may be 2 / 5 or less of the width m of the base 41, 1 / 3 or less, or 3 / 10 or less.

[0064] In the initial state or initial movement state, the load of the object M is applied to the connection point of the fulcrum member 40 with the rudder bar 20 (see FIG. 21 ). However, because the fulcrum member 40 of this second modification has a notch C formed in the front portion of its lower end, it is somewhat unstable in terms of supporting this load. That is, as illustrated by the outline arrow in FIG. 21 , a torque acts on the fulcrum member 40, centered on the front edge U of the lower end of the support portion 42. Therefore, when the rear end of the rudder bar 20 is lowered from the initial state or initial movement state, a forward force is already being applied to the rudder bar 20, allowing the rudder bar 20 to move forward more naturally. This allows the user to more smoothly perform the operation in step S102 of FIG. 15 .

[0065] The fulcrum member 40 may be configured so that the edge U is located rearward of the axial line J in a side view. The shape of the notch C is not limited to a stepped shape, and various shapes, such as a shape with a curved surface, may be adopted. The fulcrum member 40 may have a dense structure overall, or may have a hollow structure, and may be configured with plate-like or rod-like members arranged on both sides, the front end, the rear end, and the bottom. The fulcrum member 40 may also be formed into a plate by arranging multiple square pieces of material with notches at their ends.

[0066] The fulcrum member 40 may have a recess formed in the rear portion of the lower end, as shown in Figure 22. Even in such a configuration, it is preferable that the distance p of the fulcrum member 40 is less than half the width m of the base 41 in a side view. In this way, when the rotation shaft 51 is positioned at the center of the fulcrum member 40 in the fore-and-aft direction in a side view, the edge U is located rearward of the axis line J. Other configurations and alternative configurations and structures of the bogie 100 of this modified example 2 are the same as those of the exemplary configuration described with reference to Figures 1 to 19. The bogie 100 may be configured by combining the structure of modified example 1 and the structure of modified example 2 to the extent possible.

[0067] As described above, the bogie 100 of the second modified example has a notch C formed in the front portion of the lower end of the fulcrum member 40. In other words, the entire front portion of the lower end of the fulcrum member 40 is recessed in a notched shape. Therefore, in the initial state or initial movement state, a forward torque is generated due to the load applied to the pivot shaft 51 of the fulcrum member 40. Therefore, when the rear end of the rudder bar 20 is lowered from the initial state or initial movement state, the rudder bar 20 naturally moves forward, improving operability for the user. However, the bogie 100 of the second modified example can also achieve the various effects described using Figures 1 to 15, etc. The fulcrum member 40 may have a distance p that is equal to or greater than ½ or ⅓ of the width m of the base 41 in a side view.

[0068] <Example> 23 to 27, the structure of a truck 100 made primarily of wood will be described as one embodiment. The truck 100 illustrated in FIGS. 23 to 27 corresponds to the structure of a modified example. The truck 100 of this embodiment is approximately the same size as the truck with the above-mentioned "distance Tc of 210 cm and distance Ta of 40 cm," and the rear limit angle θm is set to approximately 25 to 30 degrees (approximately 27.5 degrees).

[0069] The bogie 100 of this embodiment has a loading platform 10, a front fall prevention part 15a, a rear fall prevention part 15b, a pair of rudder rods 20, two movable members 30, a fulcrum member 40, a support member 50, a pivot shaft 51, a gripping part 60, a front restraining member 71, and a rear restricting member 72. In the example of each figure, two front fall prevention parts 15a are provided on the loading platform 10, reinforcing the strength of the front end part of the bogie. The bogie 100 of this embodiment also has a pair of support members 65 that support both ends of the gripping part 60.

[0070] The steering bar 20 of this embodiment is composed of a first member 2a to which the platform 10 is fixed, a second member 2b to which the grip 60 is attached, and a connecting member 2x that connects the first member 2a and the second member 2b. The first member 2a, the second member 2b, and the connecting member 2x are connected by a connecting member 2n. The connecting member 2n is composed of, for example, a bolt and a nut.

[0071] The cart 100 can be separated into a front member 1A and a rear member 1B by removing the connecting members 2x. The front member 1A consists of a first member 2a and multiple components connected directly or indirectly thereto, and the rear member 1B consists of a second member 2b and multiple components connected directly or indirectly thereto. Separating the cart into the front member 1A and the rear member 1B facilitates transportation and saves space when storing the cart in a warehouse or the like. It is preferable that the front member 1A has movable members 35 attached to the rear ends of the pair of first members 2a. This makes it easy to take the front member 1A in and out of a warehouse or the like. Swivel casters (swivel wheels) are suitable as the movable members 35.

[0072] An elastic member 26 that covers the front end of each of the pair of rudder bar sections 20 is attached via the mounting member 6a. The elastic member 26 can mitigate the impact when the front end of the carriage collides with the riser K (see Figures 9, 10, and 14). The shape and size of the elastic member 26 and the structure of the mounting member 6a are not limited to the examples shown in the figures.

[0073] As shown in Figures 26 and 27, in the bogie 100 of this embodiment, an auxiliary base 29 is provided inside the front end of the rudder bar unit 20 to ensure mounting space for the movable member 30. The bogie 100 in each figure has an elastic member 38 provided at the front end of the fulcrum member 40. The elastic member 38 absorbs the impact when the fulcrum member 40 abuts against the front restraining member 71. The fulcrum member 40 of this embodiment has a base 41 formed by combining a plate material and a square timber, and a square timber is fixed to the base 41 as a support member 42. With this structure, the fulcrum member 40 is configured so that the rear edge E of the lower end of the support member 42 fits within the region R. The square timber and plate materials that constitute the bogie 100 may have R-chamfered edges. As can be seen from Figures 26 and 27, the fulcrum member 40 is supported by a pair of rudder bar sections 20 via a rotation shaft 51 so that it can rotate at least rearward on the back side of the loading platform section 10.

[0074] The above-described embodiment (including the modified examples and examples) is merely an example of the staircase cargo hoisting cart according to the present invention, and the technical scope of the present invention is not limited to these embodiments. For example, the cart 100 may be configured without the gripping portion 60. In this case, a user can move the cart 100 by holding the other end of the pair of rudder bars 20. When two people are operating the cart 100, one person can hold the rear end of one of the rudder bars 20, and the other person can hold the other rudder bar 20 to operate the cart 100. In this case, the other end of the pair of rudder bars 20 can be processed to be easy to grip, or a grip or the like can be provided on the other end of the pair of rudder bars 20. Alternatively, the cart 100 can be configured with two rod-shaped gripping portions 60. In this case, each gripping portion 60 can be fixed to the inside of one rudder bar 20 and the other rudder bar 20, respectively.

[0075] In each figure, one pivot shaft 51 connecting one rudder bar section 20 and the other rudder bar section 20 is illustrated, but a pivot shaft 51 may be provided on each of the one rudder bar section 20 and the other rudder bar section 20. In other words, the bogie 100 may have a pivot shaft 51 connecting one side of the fulcrum member 40 to one rudder bar section 20, and a pivot shaft 51 connecting the other side of the fulcrum member 40 to the other rudder bar section 20.

[0076] The dolly 100 does not have to have the rear limiting member 72. Even in this case, the object can be unloaded by the operations exemplified in FIGS. 4 to 15. However, providing the dolly 100 with the rear limiting member 72 will improve the stability and operability of the unloading operation. The dolly 100 does not have to have the front suppressing member 71. Even in this case, the object can be unloaded by the series of operations shown in FIGS. 4 to 15. However, providing the dolly 100 with the front suppressing member 71 will improve the stability and work efficiency of the unloading operation.

[0077] The trolley 100 may be configured to have only one of the front fall prevention portion 15a and the rear fall prevention portion 15b, or may be configured to have neither. However, from the standpoint of workability and safety, it is preferable to provide both the front fall prevention portion 15a and the rear fall prevention portion 15b. Each figure shows an example of a configuration in which both side surfaces of the platform portion 10 and the side surfaces of the pair of rudder bars 20 are flush with each other, but this is not limited thereto. For example, the trolley 100 may be configured so that both side surfaces of the platform portion 10 are located outboard of the side surfaces of each of the rudder bars 20. Each figure shows an example of a configuration in which the front end surface of the platform portion 10 and the front end surfaces of the pair of rudder bars 20 are flush with each other, but this is not limited thereto. For example, the trolley 100 may be configured so that the front end surface of the platform portion 10 is located rearward of the front end surfaces of each of the rudder bars 20. In this case, the front fall prevention portion 15a may be fixed to the pair of rudder bars 20.

[0078] In each figure, one rod-shaped load-fall prevention member (15a, 15b) is shown as an example, but this is not limited to this. The load-fall prevention member may be composed of multiple rod-shaped members, multiple block-shaped members, or multiple protruding members. The surface of the loading platform 10 is not limited to being flat, and may also be uneven. A sheet-shaped anti-slip member made of rubber or the like may be attached to the surface of the loading platform 10. [Explanation of symbols]

[0079] 1A front member, 1B rear member, 2a first member, 2b second member, 2n connecting device, 2x connecting member, 6a mounting member, 10 loading platform portion, 15a front fall prevention portion (load fall prevention portion), 15b rear fall prevention portion (load fall prevention portion), 20 rudder bar portion, 25 reinforcing member, 26, 38 elastic member, 29 auxiliary base, 30, 35 movable member, 40 fulcrum member, 41 base portion, 42 support portion, 50, 65 support member, 51 pivot shaft, 60 grip portion, 71 front restraining member, 72 rear limiting member, 100 stair lifting cart (cart), C notch, Ca, Cb, T1, T2, Ta, Tb, Tc, d distance (length), p, q distance, m, n width, E, U edge, F tread portion, g Center of gravity, G ground, K riser, k eccentric length, M object, R area, S stairs, α, θ rotation angle, θm rear restriction angle.

Claims

1. The loading platform and A pair of rudder rods each having one end connected to both side portions of the loading platform; Movable members provided below the front ends of both sides of the loading platform; a fulcrum member having one end connected to a position adjacent to the rear end of the platform portion of the pair of rudder bar portions, a distance from a connection point between the fulcrum member and the rudder bar portion to the other end of the pair of rudder bar portions is longer than a distance from the connection point between the fulcrum member and the rudder bar portion to a center of the loading platform portion, The fulcrum member is A stair-mounted cargo cart in which the pair of rudder rods are pivotally supported on the back side of the loading platform so as to be able to rotate at least rearward, and a notch is formed in the front portion of the lower end.

2. The loading platform and A pair of rudder rods each having one end connected to both side portions of the loading platform; Movable members provided below the front ends of both sides of the loading platform; a fulcrum member, one end of which is connected to a position adjacent to the rear end of the loading platform, and which is pivotally supported by the pair of rudder bar sections on the back side of the loading platform so as to be able to rotate at least rearward, a distance from a connection point between the fulcrum member and the rudder bar portion to the other end of the pair of rudder bar portions is longer than a distance from the connection point between the fulcrum member and the rudder bar portion to a center of the loading platform portion, The fulcrum member is a base portion having one end connected to the pair of rudder bar portions; a support portion connected to the other end of the base portion, A staircase loading cart in which, when viewed from the side, the distance from a straight line along the rear end of the base to the front end of the support part is less than half the front-to-rear width of the base.

Images