JP3245840U - Transportation trolley - Google Patents

Abstract

An object of the present invention is to provide a transportation trolley capable of turning in a small radius, easily changing course, and improving straight-line performance even on a sloped road surface. [Solution] A transportation trolley 1 is provided with mounting tables 112 and 113 for placing articles, and front wheels 12 and 12 are provided at two front corners in the traveling direction on the lower surface side of the mounting tables, respectively. , rear wheels 13 provided at two rear corners in the traveling direction on the lower surface side of the mounting table, and intermediate wheels 14 provided respectively between each front wheel and each rear wheel. Each of the rear wheels is a flexible wheel whose wheel direction moves according to changes in the traveling direction of the transport trolley, and each intermediate wheel is a fixed wheel whose wheel direction is fixed along the front-rear direction of the transport trolley. , is configured to be movable up and down between an upper position and a lower position below the upper position. [Selection diagram] Figure 1

Description

The present invention relates to a transportation trolley.

2. Description of the Related Art Conventionally, transportation carts have been frequently used to easily transport various articles at construction sites, product storage warehouses, and the like. The general structure of these conventionally used transportation carts includes a mounting table for placing articles, front wheels provided on the lower surface of the two front corners of the mounting table in the direction of movement, and a loading table. It is provided with rear wheels provided on the lower surface side of two rear corners of the table in the direction of movement. In addition, so that the direction of the transport trolley can be easily changed when changing the course of the transport trolley, the front wheels and rear wheels are designed as swivel wheels that move in accordance with changes in the direction of travel of the transport trolley. configured.

Such conventionally used transportation carts are useful because they have a small turning radius, but when the cart is moved, the cart swings from side to side, resulting in poor straightness. In particular, as shown in FIG. 10, when the truck is moved on a sloped road surface in a direction transverse to the slope direction (for example, in the direction perpendicular to the plane of the paper in FIG. 10), part of the truck load is Due to the action in the direction of inclination, there has been a problem in that the straightness of the truck is extremely deteriorated.

The present invention has been made to solve these problems, and provides a transportation trolley that can turn in a small radius, easily change course, and improve straight-line performance even on sloped surfaces. The purpose is to

The above-mentioned object of the present invention is to provide a transportation trolley provided with a mounting table for placing an article, comprising: front wheels provided at two front corners in the direction of travel on the lower surface side of the mounting table; It is provided with rear wheels provided at two rear corners in the traveling direction on the lower surface side of the mounting base, and intermediate wheels provided respectively between each of the front wheels and each of the rear wheels, and each of the front The wheels and each of the rear wheels are flexible wheels whose wheel direction moves according to changes in the traveling direction of the transport trolley, and each of the intermediate wheels is a fixed wheel whose wheel direction is fixed along the front-rear direction of the transport trolley. This is achieved by a transportation trolley, which has wheels and is configured to be movable up and down between an upper position and a lower position below the upper position.

Further, in the above-mentioned transport trolley, each of the intermediate wheels has a first state in which the wheel direction is fixed along the front-rear direction of the transport trolley and functions as a fixed wheel, and a first state in which the intermediate wheels function as fixed wheels in which the wheel direction is fixed along the front-rear direction of the transport trolley, and a first state in which the intermediate wheels function as fixed wheels in which the wheel direction is fixed along the front-rear direction of the transport trolley, and a first state in which the intermediate wheels function as fixed wheels in which the wheel direction is fixed along the front-rear direction of the transport trolley. It is preferable that the wheel direction is configured to be switchable between a second state in which the wheel direction functions as a turning wheel and a second state.

Further, each of the intermediate wheels has a ground contact surface between the upper position above a line connecting the contact surfaces of the front wheels and the rear wheels, and a line connecting the contact surfaces of the front wheels and the rear wheels. It is preferable to be configured to be movable up and down between the lower position and the lower position.

Since the transportation trolley according to the present invention has the above-described configuration, it can be used as a trolley using intermediate wheels or without intermediate wheels. In addition, in the case where intermediate wheels are used, by setting the ground contact surface of the intermediate wheels to be below the line connecting the ground contact surfaces of the front wheels and the rear wheels, the front or rear of the truck can be raised. Since the cart can be moved in the same state, for example, even if there is a step or a depression on the road surface, it is possible to get over it without being significantly affected by the step or the like. Furthermore, when the intermediate wheel is configured as a fixed wheel, or when the intermediate wheel is configured in a first state in which the wheel direction is fixed along the front-rear direction of the transportation truck, and in accordance with a change in the traveling direction of the transportation truck, When the wheel direction is configured to be switchable between a second state in which the wheel turns and a second state in which the wheel direction turns, and when configured in the first state (a state in which the wheel functions as a fixed wheel), the progress is extremely good. I can do it. In particular, as shown in FIG. 10, even when the cart is moved on an inclined road surface in a direction transverse to the direction of inclination, extremely good straight-line performance can be achieved. Furthermore, when the intermediate wheels are used in a second state in which the wheel direction turns according to changes in the traveling direction of the transport trolley (when they function as flexible wheels), it can be used as a trolley with extremely small turning radius.

Further, each of the front wheels is provided on a front wheel support part that is arranged on the lower surface side of the above-mentioned mounting table and has a longitudinal axis along the vertical direction of the above-mentioned mounting table. It is preferable that each of the rear wheels is provided on a rear wheel support portion having a longitudinal axis extending in the vertical direction of the mounting base. By adopting such a configuration, the structure of the truck can be further simplified.

Further, each of the intermediate wheels is provided at an intermediate support section disposed between the front wheel support section and the rear wheel support section, and the intermediate support section is arranged between the front wheel support section and the rear wheel support section. It is preferable that the vehicle is provided with a pair of fixing parts that can be fixed to each of the fixing parts, and that each of the fixing parts is configured to be movable along each longitudinal axis of the front wheel support part and the rear wheel support part.

By providing an intermediate wheel in such an intermediate support part, it becomes easy to change the vertical position of the intermediate wheel, and it is possible to obtain a transportation trolley that can stably include the intermediate wheel.

The locking means maintains the first state of each of the intermediate wheels, and the locking means includes a spring-loaded engagement protrusion that locks the intermediate wheels while the intermediate wheels are turning. The shaft is configured to engage with a through hole formed in a fixed plate on which the shaft is installed, and when the intermediate wheel, which rotates toward the front wheel side, is in a state along the front-rear direction of the transportation trolley, the wheel It is possible to form a first locked state in which the direction is fixed, and a second locked state in which the intermediate wheel is fixed when the intermediate wheel pivots toward the rear wheel side is in a state along the longitudinal direction of the transportation trolley. It is preferable.

By adopting such a configuration, it is possible to reliably create a locked state by moving the cart either forward or backward, improving convenience for the cart user. I can do it.

Preferably, the locking means includes a lever portion, and is configured to be able to switch between the first state and the second state by raising and lowering the lever portion.

According to the present invention, it is possible to provide a transportation trolley that can turn in a small radius, easily change course, and can improve straight-line performance even on a sloped road surface.

FIG. 1 is a front view of a schematic configuration of a transportation trolley according to the present invention. FIG. 2 is a side view schematically showing the structure of the transportation trolley shown in FIG. 1. FIG. FIG. 2 is a schematic plan view of the structure of the transportation trolley shown in FIG. 1. FIG. FIG. 3 is an explanatory diagram for explaining how to use the transportation trolley according to the present invention. FIG. 3 is an explanatory diagram for explaining how to use the transportation trolley according to the present invention. FIG. 3 is an explanatory diagram for explaining how to use the transportation trolley according to the present invention. It is an explanatory view for explaining the effect of the transportation truck concerning the present invention. It is an explanatory view for explaining the effect of the transportation truck concerning the present invention. It is an explanatory view for explaining the effect of the transportation truck concerning the present invention. It is an explanatory view for explaining a problem in a conventional transportation trolley.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The transportation trolley 1 according to the present invention will be described below with reference to the accompanying drawings. Note that each figure is partially enlarged or reduced in order to facilitate understanding of the configuration. FIG. 1 is a front view of a schematic structure of a transportation trolley 1 according to the present invention, FIG. 2 is a side view of its schematic structure, and FIG. 3 is a plan view of its schematic structure. As shown in FIGS. 1 to 3, this transportation truck 1 includes a truck body 11, front wheels 12, rear wheels 13, and intermediate wheels 14.

The trolley body 11 is a frame body formed by combining metal pipes 111 made of stainless steel, aluminum, etc., and a mounting table 112 for mounting articles is disposed at the lower part. Further, a second mounting table 113 on which articles are placed is provided in the middle portion of the trolley body 11. Further, a side wall panel may be installed on the side surface of the frame body (in this embodiment, no side wall panel is installed). Note that the connection between the respective pipes is not particularly limited, and may be connected by a known pipe joint clamp or the like or by welding. Furthermore, the method of connecting the mounting tables 112 and 113 to the frame body is not particularly limited, and the connection can be made by a known joint clamp or the like or by welding. Alternatively, a hook-shaped locking portion may be attached to the side edge of the mounting table, and the locking portion may be attached by engaging with a pipe installed in a horizontal state.

The front wheels 12 are provided on the lower surface side of the mounting table 112 at two front corners in the traveling direction, and the rear wheels 13 are provided on the lower surface side of the mounting table 112 at two rear corners in the traveling direction. It is provided. More specifically, each front wheel 12 is provided on a front wheel support part 114 that is arranged on the lower surface side of the mounting table 112 and has a longitudinal axis along the vertical direction of the mounting table 112. Each rear wheel 13 is provided on a rear wheel support portion 115 which is arranged and has a longitudinal axis extending in the vertical direction of the mounting table 112 . Note that the front wheel support portion 114 is the lower end portion of two of the vertical pipes that are disposed on the front side in the traveling direction of the truck 1 among the four corner portions of the frame body. These are the lower end portions of the two standing pipes arranged on the rear side in the traveling direction of the truck 1 among the standing pipes forming the four corner parts of the frame body. The front wheel support portion 114 and the rear wheel support portion 115 are portions that are arranged to protrude downward (toward the road surface) from the mounting table 112 . Further, each of the front wheels 12 and each of the rear wheels 13 is configured as a freely movable wheel that moves (turns) in accordance with a change in the traveling direction of the transportation trolley 1.

The intermediate wheels 14 are wheels provided between the front wheels 12 and the rear wheels 13 (preferably in the center). Each of these intermediate wheels 14 is configured to be movable up and down between an upper position and a lower position below the upper position. More specifically, the contact surface of each intermediate wheel 14 is located at an upper position (the state shown in FIG. 1) above a line connecting the contact surfaces of the front wheel 12 and the rear wheel 13, and the front wheel 12 and the rear It is configured to be movable up and down between the lower position (the state shown in FIG. 5) located below the line connecting the contact surfaces of the wheels 13. Each intermediate wheel 14 is provided on an intermediate support section 15 disposed between a front wheel support section 114 and a rear wheel support section 115. The intermediate support part 15 is a bar member made of metal such as stainless steel or aluminum, and includes a pair of fixing parts 16 that can be fixed to the front wheel support part 114 and the rear wheel support part 115, respectively. The portion 114 and the rear wheel support portion 115 are configured to be movable along their respective longitudinal axes. Although the specific structure of the fixing part 16 is not particularly limited, it is preferable to use a known pipe joint clamp or the like, for example.

Further, each intermediate wheel 14 is configured as a fixed wheel whose wheel direction is fixed along the front-rear direction of the transportation trolley 1. In other words, the rotation direction of the intermediate wheels 14 is along the front-rear direction of the transportation trolley 1.

In addition, each intermediate wheel 14 has a first state in which the wheel direction is fixed along the front-rear direction of the transport trolley 1 (a state in which it functions as a fixed wheel), and a first state in which the wheel direction is fixed along the front-rear direction of the transport trolley 1, and a state in which the wheel direction is fixed according to a change in the traveling direction of the transport trolley 1. The wheel may be configured to be switchable between a second state in which the wheel direction moves (turns) (a state in which the wheel functions as a free wheel). When the intermediate wheel 14 is configured as such a switchable wheel, switching between the first state and the second state is performed via a switching means (not shown) with a lever provided on the intermediate wheel 14. It will be done. The first state and the second state can be switched by raising and lowering the lever portion. It should be noted that the configuration may be such that the rising movement of the lever part brings the first state and the descending action brings the second state, or alternatively, the lowering action of the lever part brings the first state, and the raising action brings the second state. may be configured.

The intermediate wheel 14 is provided with a locking means for maintaining the first state, that is, a state in which the wheel functions as a fixed wheel that rotates only along the front-rear direction of the transportation trolley 1. During the rotation of the intermediate wheel 14, the spring-loaded engagement protrusion engages with a through hole formed in the fixed plate on which the pivot axis of each intermediate wheel 14 is installed. For example, when the lever part is pushed down, the spring-biased engagement protrusion comes into contact with the lower surface of the fixed plate, and while maintaining this state, the engagement protrusion rotates as the intermediate wheel 14 turns. However, when the intermediate wheel 14 reaches the through hole, the tip of the engaging protrusion is inserted into the through hole, and the rotation of the intermediate wheel 14 is restricted. In addition, this locked state is a first locked state in which the wheel direction is fixed when the intermediate wheel 14 rotating toward the front wheel 12 side is aligned in the front-rear direction of the transportation trolley 1, and a first locked state in which the wheel direction is fixed when the intermediate wheel 14 turns toward the front wheel 12 side. It is configured to be able to form a second locked state in which it is locked when the intermediate wheels 14 that turn toward the side are in a state along the front-rear direction of the transportation trolley 1. That is, by forming the through holes on the imaginary line connecting the front wheel 12 and the rear wheel 13 and at positions on both sides of the wheel, the first locked state and the second locked state can be formed. It is composed of Note that, for example, by pushing up the lever portion, the distal end portion of the engagement protrusion comes out of the through hole downwardly, so that the intermediate wheel 14 becomes able to turn.

A method of using the transportation trolley 1 having the above configuration will be explained below. First, as shown in FIG. 4, when the ground contact surface of the intermediate wheel 14 is arranged at a position above the line connecting the ground contact surfaces of the front wheel 12 and the rear wheel 13 (in the case of an upper position), the conventional bogie It is used as a trolley that is virtually the same as the . In this case, the transportation trolley 1 will be moved using the four wheels installed on the ground, that is, the front wheels 12 and the rear wheels 13. Since the wheels are freely movable in accordance with changes in the direction of travel of the trolley 1, it is possible to make extremely small turns when transporting on flat ground, making it possible to easily change the course.

Further, as shown in FIG. 5, the fixing part 16 of the intermediate support part 15 on which the intermediate wheel 14 is arranged is once loosened, and the intermediate support part 15 is moved along each longitudinal axis of the front wheel support part 114 and the rear wheel support part 115. The ground contact surface of the intermediate wheel 14 is moved to a position below the line connecting the ground contact surfaces of the front wheel 12 and the rear wheel 13, and When re-fixing is performed, as shown in FIG. 6, the trolley 1 can be moved with the front or rear part floating, so for example, when there are steps or depressions on the road surface, the trolley 1 can be moved. It is also possible to climb over steps, etc. without being significantly affected by them, making it possible to avoid giving a large impact to the goods being transported.

In addition, in the form shown in FIGS. 5 and 6, when the intermediate wheels 14 are configured as fixed wheels, or when the intermediate wheels 14 are configured as a first state in which the wheel direction is fixed along the front-rear direction of the transportation trolley 1. , the wheel direction is configured to be switchable between a second state in which the wheel direction turns according to a change in the traveling direction of the transportation trolley 1, and the first state (a state in which the wheel functions as a fixed wheel) is configured. In this case, of the four wheels (front wheel 12 and intermediate wheel 14, or intermediate wheel 14 and rear wheel 13) installed on the ground, the intermediate wheel 14 functions as a fixed wheel, so it is difficult to transport the vehicle on flat ground. The straightness can be made extremely good. In addition, as shown in FIG. 10, when the truck 1 is moved on a sloped road surface in a direction transverse to the slope direction (for example, in a direction perpendicular to the plane of the paper in FIG. 10), part of the truck load is However, since the intermediate wheels 14 are fixed wheels, the intermediate wheels 14 do not turn and are always facing the direction of travel, so they can exhibit extremely good straight running performance. can.

In addition, in the form shown in FIGS. 5 and 6, when the intermediate wheels 14 are in the second state (state functioning as a free wheel) in which the wheel direction turns according to the change in the traveling direction of the transportation trolley 1, All of the four installed wheels (front wheel 12 and intermediate wheel 14, or intermediate wheel 14 and rear wheel 13) are swivel wheels, so when transporting on flat ground, it is extremely easy to turn, and the course can be easily changed. It becomes possible to do so.

Further, the transport trolley 1 according to the present invention has a first state in which the intermediate wheels 14 are fixed along the front-rear direction of the transport trolley 1, and a wheel direction in which the intermediate wheels 14 are fixed in the forward and backward direction of the transport trolley 1; When the intermediate wheels 14 are configured to be switchable between the second state in which the direction turns and the second state, the intermediate wheels 14 function as fixed wheels in which the wheels rotate only in the first state, that is, along the front-rear direction of the transportation trolley 1. The locking means fixes the direction of the wheels when the intermediate wheels 14, which turn toward the front wheels 12, are aligned in the longitudinal direction of the transportation trolley 1. and a second lock state in which the vehicle is locked when the intermediate wheels 14 rotating toward the rear wheels 13 are aligned in the longitudinal direction of the transportation trolley 1. There is. With such a configuration, the intermediate wheels 14 can be fixed in the wheel direction along the front-rear direction of the transportation truck 1 from the second state in which the wheel direction rotates according to changes in the traveling direction of the transportation truck 1. It is possible to improve workability when shifting to the first state.

That is, in the present invention, as described above, in the locking means, for example, when the lever part is pushed down, the spring-biased engagement protrusion comes into contact with the lower surface of the fixed plate, and the intermediate wheel 14 When the engagement protrusion, which rotates as the intermediate wheel 14 rotates, reaches the through hole, the tip of the engagement protrusion is automatically inserted into the through hole, thereby restricting the rotation of the intermediate wheel 14. , the through holes are formed on an imaginary line connecting the front wheel 12 and the rear wheel 13, and are formed at positions on both sides of the wheel. However, if the configuration includes a single through hole, Even if the lever portion is pushed down and the spring-biased engagement protrusion comes into contact with the lower surface of the fixing plate, depending on the direction in which the intermediate wheel 14 turns thereafter, the tip of the engagement protrusion may not be inserted into the through hole. There are cases where it always functions as a swivel wheel.

To explain more specifically, as a configuration having a single through hole, the single through hole exists on the arrow A side in FIG. Consider the case where the tip of the mating protrusion is inserted into the through hole and locked. In such a case, in FIG. 8, which shows a state in which the intermediate wheels 14 function as free wheels before pressing down the lever part, after pressing down the lever part, the trolley 1 is moved in the direction of arrow B (backward direction of the trolley 1) 7, the intermediate wheel 14 turns toward the front wheel 12 of the trolley 1, and the tip of the engagement protrusion is inserted into the through hole, as shown in FIG. When the truck 1 is moved in the C direction (the front direction of the truck 1), the intermediate wheel 14 turns toward the rear wheel 13 side as shown in FIG. The through hole cannot be engaged with the hole, and the intermediate wheel 14 cannot be locked. In such a case, the user will notice that the cart 1 is not locked after moving it a predetermined distance, and after realizing this, move the cart 1 in the direction B, which is a direction different from the direction C, which is the traveling direction. It is necessary to move the intermediate wheel 14 and turn it toward the front wheel 12 side. In other words, when the user wants to lock the intermediate wheels 14, the trolley 1 must be moved in the opposite direction to the direction the user wants to go, making it impossible to form the locked state efficiently and making it difficult to move smoothly. Not being able to transport it will be a hassle. In addition, in explaining the configuration of the transportation trolley 1 according to the present invention, the wheels are explained separately as the front wheels 12 and the rear wheels 13 for convenience, but in actual use, the rear wheels 13 side are the front wheels in the traveling direction. Since this frequently occurs, it is thought that the user often becomes unsure in which direction the trolley 1 should be moved to achieve the locked state, and there is no waste in forming the locked state as described above. These actions can occur frequently. In contrast, by forming the through holes on the imaginary line connecting the front wheels 12 and the rear wheels 13 at positions on both sides of the wheels, the bogie 1 can be moved either forward or backward. By moving it to , you can reliably create a locked state. In other words, there is no need to move the trolley 1 in the opposite direction if the lock state does not occur, and it is possible to create a special zone state by always moving the trolley 1 in the desired direction, increasing the convenience of the trolley user. It can be greatly improved.

1 Transport trolley 11 Truck main body 114 Front wheel support section 115 Rear wheel support section 12 Front wheel 13 Rear wheel 14 Intermediate wheel 15 Intermediate support section

Claims (7)

A transportation trolley equipped with a mounting table for placing articles,
Front wheels provided at two front corners in the direction of travel on the lower surface side of the mounting table;
Rear wheels provided at two rear corners in the direction of travel on the lower surface side of the mounting table;
and an intermediate wheel provided between each of the front wheels and each of the rear wheels,
Each of the front wheels and each of the rear wheels are flexible wheels whose wheel direction moves according to changes in the traveling direction of the transportation trolley,
Each of the intermediate wheels is a fixed wheel whose wheel direction is fixed along the front-rear direction of the transportation trolley, and is configured to be movable up and down between an upper position and a lower position below the upper position. A transportation trolley characterized by: Each of the intermediate wheels has a first state in which it functions as a fixed wheel in which the wheel direction is fixed along the front-rear direction of the transportation truck, and a first state in which it functions as a fixed wheel in which the wheel direction is fixed along the front-rear direction of the transportation truck, and as a flexible wheel in which the wheel direction turns according to a change in the traveling direction of the transportation truck. The transportation trolley according to claim 1, wherein the transportation trolley is configured to be switchable between a functioning second state and a functioning second state. Each of the intermediate wheels has a ground contact surface at the upper position above a line connecting the ground contact surfaces of the front wheels and the rear wheels, and at a position below the line connecting the ground contact surfaces of the front wheels and the rear wheels. The transportation trolley according to claim 1 or 2, wherein the transportation trolley is configured to be movable up and down between the lower position and the lower position. Each of the front wheels is provided on a front wheel support part that is disposed on the lower surface side of the mounting table and has a longitudinal axis along the vertical direction of the mounting table,
Transportation according to claim 1 or 2, characterized in that each of the rear wheels is provided on a rear wheel support part which is arranged on the lower surface side of the mounting table and has a longitudinal axis along the vertical direction of the mounting table. trolley. Each intermediate wheel is provided at an intermediate support section disposed between the front wheel support section and the rear wheel support section,
The intermediate support part includes a pair of fixing parts that can be fixed to the front wheel support part and the rear wheel support part, respectively, and each of the fixing parts is fixed to each longitudinal axis of the front wheel support part and the rear wheel support part. The transportation trolley according to claim 4, characterized in that it is configured to be movable along. comprising locking means for maintaining the first state of each of the intermediate wheels;
The locking means is configured such that, while the intermediate wheels are turning, the spring-biased engagement protrusions engage with through holes formed in the fixed plate on which the pivot shafts of the respective intermediate wheels are installed, thereby locking the first intermediate wheels. It is a configuration that forms a state,
a first locking state in which the wheel direction is fixed when the intermediate wheel turns toward the front wheel side and is in a state along the front-rear direction of the transportation trolley; and a first lock state in which the intermediate wheel turns toward the rear wheel side. 3. The transporting trolley according to claim 2, wherein the transporting trolley is capable of forming a second locked state in which the wheels are locked when the wheels are aligned in the front-rear direction of the transporting trolley. The locking means includes a lever portion,
7. The transportation trolley according to claim 6, wherein the first state and the second state are switchable by raising and lowering the lever portion.

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