Six-wheeled cart

Abstract

We provide a six-wheeled trolley that combines stability and maneuverability. [Solution] The six-wheeled trolley 1 is equipped with a pair of swivel casters 10, 14 on the bottom front and rear ends of the trolley frame, a pair of swivel-fixed casters 12 on the bottom center, and a first pedal 112 provided near the top of the swivel-fixed casters 12 on the trolley frame. The swivel-fixed caster 12 is equipped with a bracket 120 that is mounted on the six-wheeled trolley 1 and is rotatable relative to the six-wheeled trolley, a wheel portion 124 mounted on the bracket, a recess 122 provided on the top of the bracket 120, and a first transmission member 110 that is connected to the first pedal 112 and connected to a protrusion 121 that is rotatable with the recess 122. When the recess 122 and the protrusion 121 are engaged, the bracket 120 is fixed, and when force is applied to the first pedal 112, the recess 122 and the protrusion 121 separate, and the bracket 120 becomes rotatable.

Description

Technical Field

[0001] The present invention relates to a six-wheeled cart.

Background Art

[0002] The present invention relates to a six-wheeled cart used for transporting and storing goods.

[0003] Conventionally, there is a so-called six-wheeled cart having swivel casters at the four corners of a six-wheeled cart frame and a fixed caster provided at an intermediate position in the traveling direction of the cart. In a six-wheeled cart, when traveling with a load on it, in order to exhibit straight-ahead performance and some rotational performance, there is a structure in which the fixed caster and one or both of the swivel casters in the traveling direction are grounded. Also, in a state where no load is placed, there is a type in which only swivel casters are installed without grounding the fixed wheels in order to make a small turn effectively.

[0004] In recent years, in order to effectively utilize space, there is known a six-wheeled cart having a structure in which a front-end member and a rear-end member are arranged in parallel at a predetermined interval, the upper part of the front-end member is fixed, and the rear-end member is connected via a connecting member elevating mechanism. This cart has a cart frame composed of a connecting member fixed to the central lower part of a central member, a pair of swivel casters are respectively mounted on the bottom surfaces of the front-end member and the rear-end member, and a pair of fixed casters are mounted on the bottom surface of the central member. Also, shelf frames are respectively attached to the upper parts of the front-end member and the rear-end member.

[0005] This cart is provided with a connecting member elevating mechanism that elevates the connecting member in conjunction with the rotation of a platen mounted so as to be able to rise and fall. The connecting member elevating mechanism has a vertically cylindrical portion fixed to the rear end of the connecting member and a vertical guide portion fixed to the upper part of the rear-end member that guides the inner surface of the vertically cylindrical portion so as to be movable only in the vertical direction. Also, it is composed of a lifting link that protrudes from the side wall of the vertically cylindrical portion and connects a pivot support shaft that is a support shaft of a platen attachment member of a rotatable platen, an upper link fulcrum provided on the platen attachment member, and a lower link fulcrum provided on the rear-end member.

[0006] This six-wheeled trolley is characterized by a structure in which, when the base plate is in a down position, the fixed casters are in contact with the floor surface, and when the base plate is raised, the connecting member rises via a connecting member lifting mechanism, thereby lifting the fixed casters away from the floor surface (Patent Document 1). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 6244577 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, the trolley described in Patent Document 1 has the following problems. This six-wheeled trolley is difficult to turn and change direction, and is particularly difficult to operate in narrow spaces or complex transport routes. A trolley equipped with fixed casters has excellent straight-line movement, but it is difficult to turn freely when changing direction, making it inconvenient to operate. On the other hand, if all casters are swivel casters, the casters may rotate unnecessarily during transport, making the load unstable, which may cause safety problems.

[0009] Furthermore, with conventional six-wheeled carts, it is difficult to properly control the casters according to the user's position when operating the cart, and remotely switching or locking the casters is inconvenient, especially when operating from the side or front / rear of the cart.

[0010] Furthermore, trolleys with complex mechanisms often require complicated maintenance, have high manufacturing costs, and are more prone to malfunctions due to prolonged use, making maintenance and management difficult.

[0011] The present invention aims to provide a six-wheeled trolley that can achieve both stability and operability in order to solve the above-mentioned problems. [Means for solving the problem]

[0012] The present invention relates to a six-wheeled trolley comprising: a pair of swivel casters mounted on the bottom front and rear ends of a trolley frame, a pair of swivel-fixed casters mounted on the bottom center of the trolley frame, a first point of force application provided near the upper part of the swivel-fixed casters on the trolley frame, and a first transmission member having one end connected to the first point of force application provided on the trolley frame and connected to a protrusion, wherein the swivel-fixed caster comprises a bracket mounted on the trolley frame and rotatable relative to the trolley frame, a wheel portion mounted on the bracket, and a recess provided on the upper part of the bracket that can engage with the protrusion, wherein when the recess and the protrusion are engaged, the bracket is fixed, and when force is applied to the first point of force application, the recess and the protrusion separate, and the bracket becomes rotatable.

[0013] Normally, the freely adjustable fixed caster is fixed because the recessed and protruding parts are engaged. This allows the six-wheeled trolley to move stably in the desired direction. When you want to change direction, applying force, such as by stepping on the first point of force on the trolley frame, causes the recessed and protruding parts to separate, allowing the bracket to pivot freely, making it easier to change direction and improving operability.

[0014] By utilizing this switching mechanism, the freely adjustable, fixed casters can be transported without unnecessary rotation during cargo transport, remaining fixed in place. Furthermore, since rotation can be easily switched when needed, it enables transport that combines stability and convenience. This allows the six-wheeled cart to be moved flexibly even in narrow spaces or along complex routes. In this way, we can provide a six-wheeled cart that combines stability and maneuverability.

[0015] Furthermore, in one embodiment of the present invention, the first transmission member is a substantially cylindrical member connected to the substantially square first point of force application, the convex portion is arranged on the circumferential surface of the first transmission member and connected to the first point of force application at a substantially right angle, the concave portion is a substantially U-shaped notch, and by applying force in a predetermined direction to the first point of force application, the first transmission member rotates and the convex portion moves away from the concave portion, characterized in that the six-wheeled trolley is provided.

[0016] With this configuration, the locking and unlocking mechanism of the freely adjustable caster consists of a combination of a bracket, a recess, and a protrusion, enabling the locking and unlocking of the caster with a simple structure. This reduces maintenance and manufacturing costs, and ensures stable performance even with long-term use. In this way, it is possible to provide a six-wheeled trolley that combines stability and operability over a long period of time.

[0017] Furthermore, in one embodiment of the present invention, the six-wheeled bogie is characterized by comprising a second point of force application provided at the front end and / or rear end of the bogie frame, and a first link mechanism that transmits a predetermined force applied to the second point of force application to the first transmission member, wherein by applying a force in a predetermined direction to the second point of force application, the first transmission member rotates via the first link mechanism, and the convex portion moves away from the concave portion.

[0018] This configuration allows for flexible switching of the caster's operation by applying force from multiple points, such as the "first point of force" and the "second point of force." This enables users to easily lock and unlock the casters according to the situation, allowing for effective use of the trolley in various transport environments. For example, when standing on the side of the six-wheeled trolley, the trolley can be operated by stepping on the first point of force, and when operating the trolley from the front or rear, the trolley can be operated by stepping on the second point of force, allowing for flexible operation. This enables the six-wheeled trolley to be moved flexibly even in narrow spaces or along complex routes. In this way, a six-wheeled trolley that combines stability and operability can be provided.

[0019] Furthermore, in one embodiment of the present invention, a six-wheeled trolley is provided, comprising: a gear-shaped gear portion provided between the wheel portion and the bracket; a stopping member rotatably mounted on the bracket and capable of engaging with the gear portion; and a rod-shaped member having one end connected to a third point of force provided on the trolley frame and the other end connected to the stopping member, wherein by applying force in a predetermined direction to the rod-shaped member, the stopping portion rotates around the bracket via the rod-shaped member and engages with the gear.

[0020] By configuring it in this way, the six-wheeled cart can be fixed in place by applying force, such as by stepping on the "third point of force application." This prevents unintended movements and reduces the likelihood of accidents. In this way, a six-wheeled cart that achieves both stability and operability can be provided.

[0021] Furthermore, in one embodiment of the present invention, the six-wheeled bogie is characterized by comprising a fourth point of force application provided at the front end and / or rear end of the bogie frame, and a second link mechanism that transmits a predetermined force applied to the fourth point of force application to the rod-shaped member, wherein by applying a force in a predetermined direction to the fourth point of force application, the force is transmitted to the rod-shaped member via the second link mechanism, the stopping part rotates around the bracket via the rod-shaped member and engages with the gear.

[0022] This configuration allows for operation by applying force from multiple points, such as the "third point of force" and the "fourth point of force," enabling precise stopping of the six-wheeled cart. This allows the user to easily stop and release the six-wheeled cart according to the situation. For example, when standing on the side of the cart, the user can operate it by stepping on the third point of force, and when operating the cart from the front or rear, they can operate it by stepping on the fourth point of force. This allows for flexible movement of the six-wheeled cart even in narrow spaces or along complex routes. In this way, a six-wheeled cart that combines stability and operability can be provided.

[0023] Furthermore, the six-wheeled trolley comprises a pair of swivel casters mounted on the bottom surface of the front and rear ends of the trolley frame, a pair of swivel-fixed casters mounted on the bottom surface of the central part of the trolley frame, a substantially rectangular first point of force provided on the upper part of the swivel-fixed casters on the trolley frame, a second point of force provided on the front and rear ends or one of them of the trolley frame, a third point of force provided on the upper part of the swivel-fixed casters on the trolley frame, a fourth point of force provided on the front and rear ends or one of them of the trolley frame, a substantially cylindrical first transmission member having a protrusion at one end connected to the first point of force and engaging with the recess, and a first link mechanism that transmits a substantially vertical force applied to the second point of force to the first transmission member, wherein the protrusion is arranged on the circumferential surface of the first transmission member and connected to the first point of force at a substantially right angle, and the swivel-fixed casters are mounted on the trolley frame and the trolley The six-wheeled bogie comprises a bracket that can pivot relative to the frame, a wheel portion mounted on the bracket, a substantially U-shaped notched recess provided on the upper part of the bracket, a gear-shaped gear portion provided between the wheel portion and the bracket, a stopping member that is rotatably mounted on the bracket and engages with the gear portion, and a rod-shaped member with one end connected to a third point of force application provided on the bogie frame and the other end connected to the stopping member, wherein the bogie frame is provided with a second link mechanism that transmits substantially vertical force applied to the fourth point of force application to the rod-shaped member, and by applying a substantially vertical force to the first point of force application or the second point of force application, the first transmission member rotates via the first link mechanism, the protrusion separates from the recess, the bracket becomes pivotable, and by applying a substantially vertical force to the fourth point of force application, the rod-shaped member transmits force via the second link mechanism, the stopping portion rotates around the bracket and engages with the gear portion.

[0024] By configuring it in this way, the six-wheeled cart of the present invention is characterized in that, with a structure combining a swivel caster and a fixed-switching caster, the balance between the turning performance and the straight-line performance can be appropriately adjusted. Since the caster can be fixed and switched to a swivel state, the user can significantly improve the operability by fixing or freely moving the caster according to the situation. When moving straight, the fixed caster functions, and when rotating, the swivel caster functions, enabling easy turning in a small radius and facilitating operation in narrow spaces.

[0025] Furthermore, by providing a plurality of force points, the structure enables flexible switching of the caster operation. By applying force through the first force point or the second force point, the user can easily operate the fixing and releasing of the caster. This allows for appropriate control of the cart according to the transportation environment. Also, since the first link mechanism and the second link mechanism are responsible for force transmission, the caster can be switched even by remote operation, improving the work efficiency.

[0026] The caster fixing and releasing mechanism realizes a simple and robust structure through the combination of a bracket, a concave part, and a convex part. This suppresses the maintenance and manufacturing costs and can maintain stable performance even during long-term use. Also, since the force is transmitted by applying force in the vertical direction, the operation is not affected by the way and direction of force application, and it has a highly flexible design. As a result, the operator can fix and release the caster with less labor, reducing the work burden.

[0027] In this way, this cart is excellent in operability, stability, and transportation efficiency, and can cope with a wide range of transportation environments. Furthermore, due to the effective design of the caster free-switching mechanism and the link mechanism, the user can freely control the cart according to the situation, realizing the efficiency improvement of the transportation work.

Brief Description of the Drawings

[0028] [Figure 1] It is a front view for explaining the six-wheeled cart according to an embodiment of the present invention. [Figure 2]This is an explanatory diagram illustrating the pedals of a six-wheeled cart according to an embodiment of the present invention. [Figure 3] This is an explanatory diagram illustrating the movement of the freely lockable caster of a six-wheeled trolley according to an embodiment of the present invention. [Figure 4] This is an explanatory diagram illustrating the brake section of a six-wheeled trolley according to an embodiment of the present invention. [Figure 5] This is an explanatory diagram illustrating the link member of a six-wheeled trolley according to an embodiment of the present invention. [Figure 6] This is an explanatory diagram illustrating the movement of a pedal located at the rear of a six-wheeled cart according to an embodiment of the present invention. [Figure 7] This is an explanatory diagram illustrating the movement of a pedal located at the rear of a six-wheeled cart according to an embodiment of the present invention. [Best Mode for Carrying Out the Invention]

[0029] Figure 1 shows one embodiment of the six-wheeled trolley of the present invention. A pair of swivel casters 10 are provided at the front end of the trolley frame 20 of the six-wheeled trolley 1. A pair of swivel casters 14 are also provided at the rear end of the trolley frame 20 of the six-wheeled trolley 1. A pair of swivel-fixed / removable casters 12 are provided on the central bottom surface of the trolley frame 20 of the six-wheeled trolley 1. The swivel-fixed / removable casters 12 are normally fixed, allowing the six-wheeled trolley 1 to move stably in the desired direction. When it is desired to change direction, applying force, such as by stepping on the first pedal 112 provided on the trolley frame 20, makes it easier to change direction and improves operability.

[0030] Thus, the swivel casters 10 and 14 are examples of a pair of swivel casters mounted on the bottom surface of the front and rear ends of the trolley frame 20, respectively. Similarly, the swivel-fixed switchable caster 12 is an example of a pair of swivel-fixed switchable casters mounted on the bottom surface of the central part of the trolley frame 20.

[0031] Figure 2 is an enlarged view of the pedal section. A roughly rectangular first pedal 112 and a third pedal 130 are provided near the top of the swivel / fixed caster 12 on the trolley frame 20. When the first pedal 112 is pressed, the swivel / fixed caster 12 becomes freely directional. When the third pedal 130 is pressed, the brake is applied to the swivel / fixed caster 12. The first pedal 112 may be provided further out than the third pedal 130. When changing the direction of the six-wheeled trolley 1, providing the first pedal 112 further out than the third pedal 130 makes it easier for the operator to perform the direction change operation as the first pedal 112 is closer to them. The first pedal 112 may also be provided larger than the third pedal 130. A larger first pedal 112 makes it easier for the operator to perform the direction change operation.

[0032] Figure 3 illustrates the mechanism that enables the direction change of the freely adjustable fixed caster 12. The freely adjustable fixed caster 12 comprises a bracket 120 that is mounted on the trolley frame 20 and is rotatable relative to the trolley frame 20, and a wheel portion 120 mounted on the bracket 120. Thus, the bracket 120 is an example of a bracket that is mounted on the trolley frame and is rotatable relative to the trolley frame.

[0033] As shown in Figure 3, a recess 122 is provided on the upper part of the bracket 120. Preferably, the recess 122 is a roughly U-shaped notch. The six-wheeled trolley 1 is also provided with a first transmission member 110, one end of which is connected to a first pedal 112 provided on the trolley frame 20, and the other end of which is connected to a protrusion 121 that can engage with the recess 122. This first transmission member 110 is a roughly cylindrical member. The protrusion 121 is positioned on the circumferential surface of the first transmission member 110. The protrusion 121 is connected to the first pedal 112 at roughly a right angle. When the protrusion 121 and the recess 122 engage, the bracket 120 is fixed, and the freely adjustable caster 12 is fixed (see Figure 3A). On the other hand, when a force is applied in a roughly vertical direction, such as when the first pedal 112 is stepped on by an operator, the protrusion 121 and the recess 122 separate (see Figure 3B). As a result, the bracket 120 becomes freely rotatable, allowing the freely fixed and switchable caster 12 to change direction freely (see Figure 3C).

[0034] Thus, the first pedal 112 is an example of a first pedal provided near the upper part of the freely fixed switchable caster 12 on the trolley frame 20. Also, as shown, the protrusion 121 is an example of a protrusion arranged on the circumferential surface of the first transmission member 110 and connected to the first pedal 112 at approximately a right angle. As shown, the recess 122 is an example of a recess provided on the upper part of the bracket 120. Also, as shown, the recess 122 is an example of a recess that is approximately U-shaped. Thus, the first transmission member 110 is an example of a first transmission member in which one end is connected to the first pedal 112 provided on the trolley frame 20 and is connected to a protrusion 121 that can engage with the recess 122. Also, as shown, the first transmission member 110 is an example of a first transmission member that is approximately cylindrical and connected to the approximately square first pedal 112. Furthermore, the six-wheeled trolley 1 is an example of a six-wheeled trolley in which, when the convex portion 121 and the concave portion 122 are engaged, the bracket 120 is fixed, and when force is applied to the first pedal 112, the concave portion 122 and the convex portion 121 separate, and the bracket 120 becomes rotatable. Furthermore, the six-wheeled trolley 1 is an example of a six-wheeled trolley in which, when force is applied to the first pedal 112 in a predetermined direction, the first transmission member 110 rotates and the convex portion 121 separates from the concave portion 122.

[0035] Figure 4 illustrates the brake mechanism of the freely adjustable fixed caster 12. A gear-shaped gear section 125 is provided between the wheel section 124 and the bracket 120. A stopping member 126 is rotatably mounted on the bracket 120. This stopping member 126 can engage with the gear section 125. Furthermore, the stopping member 126 is connected to a rod-shaped member 128. One end of this rod-shaped member 128 is connected to a third pedal 130 provided on the trolley frame 20, and the other end is connected to the stopping member 126. Under normal circumstances, the gear section 125 and the stopping member 126 are separated by the action of an elastic member such as a spring (see B in Figure 4), and the wheel section 124 can move freely. On the other hand, when an operator steps on the third pedal 130, the rod-shaped member 128 moves in a substantially vertical direction. Through this movement, the stopping member 126 rotates around the bracket 120 and engages with the gear section 125. This engagement stops the rotation of the wheel section 124 (see A in Figure 4).

[0036] Thus, the wheel portion 124 is an example of a wheel portion mounted on the bracket 120. Thus, the gear portion 125 is an example of a gear-shaped gear portion provided between the wheel portion 124 and the bracket 120. Also, the stopping member 126 is an example of a stopping member that is rotatably mounted on the bracket 120 and can engage with the gear portion 125. Also, the third pedal 130 is an example of a third pedal provided on the upper part of the freely fixed switchable caster 12 on the trolley frame 20. Also, the rod-shaped member 128 is an example of a rod-shaped member in which one end is connected to the third pedal 130 provided on the trolley frame 20 and the other end is connected to the stopping member 126. Also, the six-wheeled trolley 1 is an example of a six-wheeled trolley in which, by applying force in a predetermined direction to the rod-shaped member 128, the stopping member 126 rotates around the bracket 120 via the rod-shaped member 128 and engages with the gear portion 125.

[0037] Figure 5 illustrates the connecting member. Figures 6 and 7 illustrate the second pedal 129 and the fourth pedal 131. As shown in Figure 5, the second pedal 129 and the fourth pedal 131 are provided at the rear end of the trolley frame 20. The second pedal 129 is connected to the first link mechanism 200. The other end of the first link mechanism 200 is connected to the first transmission member 110. The fourth pedal 131 is connected to the second link mechanism 300. The other end of the second link mechanism 300 is connected to the rod-shaped member 128.

[0038] Figure 6 shows the state when the second pedal 129 is not pressed. As shown in Figure 7, when the second pedal 129 is pressed, force is transmitted to the first transmission member 110 via the first link mechanism 200, causing the first transmission member 110 to rotate. As the first transmission member 110 rotates, the convex portion 121 moves away from the concave portion 122. As a result, the freely adjustable fixed caster 12 can change direction freely.

[0039] Thus, the second pedal 129 is an example of a second pedal provided at the front end and / or rear end of the bogie frame 20. Also, as described above, the first link mechanism 200 is an example of a first link mechanism that transmits a predetermined force applied to the second pedal 129 to the first transmission member 110. Also, as described above, the fourth pedal 131 is an example of a fourth pedal provided at the front end and / or rear end of the bogie frame 20. Also, as described above, the second link mechanism 300 is an example of a second link mechanism that transmits a predetermined force applied to the fourth pedal 131 to the rod-shaped member 128. Also, as described above, the six-wheeled bogie 1 is an example of a six-wheeled bogie in which, by applying a force in a predetermined direction to the second pedal 129, the first transmission member 110 rotates via the first link mechanism 200, and the convex portion 121 moves away from the concave portion 122. Also, as described above, the fourth pedal 131 is an example of a fourth pedal provided at the front end and / or rear end of the bogie frame 20. Furthermore, the second link mechanism 300 is an example of a second link mechanism that transmits a predetermined force applied to the fourth pedal 131 to the rod-shaped member 128. In addition, the six-wheeled trolley 1 is an example of a six-wheeled trolley in which, by applying a force in a predetermined direction to the fourth pedal 131, force is transmitted to the rod-shaped member 128 via the second link mechanism 300, and the stopping member 126 rotates around the bracket 120 via the rod-shaped member 128 and engages with the gear section 125.

[0040] Furthermore, when the fourth pedal 131 is pressed, the rod-shaped member 128 moves substantially vertically via the second link mechanism 300. As a result, the stopping member 126 rotates around the bracket 120 and engages with the gear section 125. This engagement stops the rotation of the wheel section 124.

[0041] Normally, the freely adjustable fixed caster 12 is fixed by the engagement of the recess 122 and the protrusion 121, allowing the six-wheeled trolley 1 to move stably in the desired direction. When it is desired to change direction, applying force to the first pedal 112 provided on the trolley frame 20 causes the recess 122 and the protrusion 121 to separate, and the bracket 120 becomes freely rotatable. This makes it easier to change direction and improves operability.

[0042] This switching mechanism allows the freely adjustable fixed caster 12 to be transported in a fixed position without unnecessarily rotating during transport. When rotation is required, it can be easily switched, resulting in transport that combines stability and convenience. This allows the six-wheeled trolley 1 to be moved flexibly even in narrow spaces or along complex routes.

[0043] This configuration allows for the simple structure of fixing and releasing the caster 12 using a combination of the bracket 120, recess 122, and protrusion 121. This reduces maintenance and manufacturing costs and ensures stable performance even with long-term use.

[0044] Multiple points of force application (such as the first pedal 112 and the second pedal 129) allow for flexible locking and unlocking of the casters 12. Depending on the situation, the user can operate by pressing the first pedal 112, or by pressing the second pedal 129 when positioned at the front or rear of the trolley 1, enabling free movement of the trolley 1 even in narrow spaces or complex environments.

[0045] The six-wheeled cart 1 can be fixed in place by applying force, such as by pressing the third pedal 130. As a result, unintended movements are prevented, and accidents during transport can be prevented. This provides a six-wheeled cart 1 that combines safety and operability.

[0046] The six-wheeled trolley 1 can be stopped freely by using the third pedal 130 or the fourth pedal 131. Depending on the situation, the trolley 1 can be stopped using either the third pedal 130 or the fourth pedal 131, allowing for flexible control of the trolley 1 even in narrow spaces or along complex routes.

[0047] The six-wheeled trolley 1 of the present invention has a structure that balances turning performance and straight-line movement performance through the combination of swivel casters 10 and swivel / fixed switchable casters 12. By switching the casters between fixed and swivel, the user can significantly improve the operability of the trolley 1. The fixed casters 12 are active when moving straight, and the swivel casters 10 are active when turning, allowing for tight turns and easy operation even in narrow spaces.

[0048] By applying force via the first pedal 112 and the second pedal 129, the user can easily lock and unlock the casters 12. Furthermore, the first link mechanism 200 and the second link mechanism 300 allow for remote operation switching of the casters 12, improving work efficiency.

[0049] The locking and unlocking mechanism of the caster 12 features a simple yet robust structure achieved through a combination of a bracket 120, a recess 122, and a protrusion 121. This design minimizes maintenance and manufacturing costs while maintaining stable performance over the long term. Because force is transmitted by applying vertical force, operation is independent of the direction of the force, allowing the caster 12 to be locked and unlocked with minimal effort.

[0050] The six-wheeled trolley 1 of the present invention offers excellent operability, stability, and transport efficiency, and can be adapted to various transport environments. Through the effective design of the freely adjustable switching mechanism and link mechanism, the user can freely control the trolley 1 according to the situation, thereby improving the efficiency of transport work. [Explanation of symbols]

[0051] 1. Six-wheeled trolley 10 Swivel Casters 12 Swivel and Fixed Switching Casters 14 Swivel Casters 20 Trolley Frames 110 First transmission member 112 First pedal (first point of force) 120 bracket 121 Convex part 122 recess 124 Wheel section 125 Gear section 126 Stopping member 128 Rod-shaped member 129 Second pedal (second point of force) 130 Third pedal (third point of force) 131. Fourth pedal (fourth point of force application) 200 First Link Mechanism 300 Second Link Mechanism

Claims

1. A pair of swivel casters are mounted on the bottom of the front and rear ends of the trolley frame, A pair of freely adjustable fixed casters are mounted on the bottom surface of the central part of the aforementioned trolley frame, The first point of force application is provided near the upper part of the freely adjustable caster on the trolley frame, A six-wheeled bogie comprising a first transmission member having one end connected to a first point of force provided on the bogie frame and connected to a protrusion, The aforementioned freely adjustable fixed caster is, A bracket attached to the aforementioned trolley frame and rotatable relative to the trolley frame, The wheel portion attached to the bracket, The bracket is provided with a recess that can engage with the protrusion, A six-wheeled trolley characterized in that the bracket is fixed when the recess and the protrusion are engaged, and when force is applied to the first point of force application, the recess and the protrusion separate, and the bracket becomes rotatable.

2. A six-wheeled trolley according to claim 1, The first transmission member is a substantially cylindrical member, Connected to the first point of force of the roughly rectangular shape, The aforementioned protrusion is positioned on the circumferential surface of the first transmission member and is connected to the first point of force application at approximately a right angle. The aforementioned recess is a roughly U-shaped notch, A six-wheeled trolley characterized in that, by applying force in a predetermined direction to the first point of force application, the first transmission member rotates and the convex portion separates from the concave portion.

3. A six-wheeled trolley according to claim 2, A second point of force applied to the front end and / or rear end of the aforementioned bogie frame, The system includes a first link mechanism that transmits a predetermined force applied to the second point of force application to the first transmission member, A six-wheeled trolley characterized in that, by applying force in a predetermined direction to the second point of force application, the first transmission member rotates via the first link mechanism, and the convex portion moves away from the concave portion.

4. A six-wheeled trolley according to claim 3, A gear-shaped gear portion is provided between the wheel portion and the bracket, A stopping member is rotatably mounted on the bracket and is capable of engaging with the gear portion, The vehicle comprises a rod-shaped member, one end of which is connected to a third point of force application provided on the trolley frame, and the other end of which is connected to the stopping member. A six-wheeled trolley characterized in that, by applying force to the rod-shaped member in a predetermined direction, the stopping part rotates around the bracket via the rod-shaped member and engages with the gear.

5. A six-wheeled trolley according to claim 4, A fourth point of force application is provided at the front end and / or rear end of the aforementioned bogie frame, The system includes a second link mechanism that transmits a predetermined force applied to the fourth point of force application to the rod-shaped member, A six-wheeled trolley characterized in that, by applying force in a predetermined direction to the four points of force application, force is transmitted to the rod-shaped member via the second link mechanism, the stopping part rotates around the bracket via the rod-shaped member and engages with the gear.

6. A pair of swivel casters are mounted on the bottom of the front and rear ends of the trolley frame, A pair of freely adjustable fixed casters are mounted on the bottom surface of the central part of the aforementioned trolley frame, A roughly rectangular first point of force is provided on the upper part of the freely adjustable caster in the trolley frame, A second point of force applied to the front end and / or rear end of the aforementioned bogie frame, A third point of force applied to the upper part of the freely adjustable caster in the trolley frame, A fourth point of force application is provided at the front end and / or rear end of the aforementioned bogie frame, A first transmission member having a roughly cylindrical shape, with one end connected to the first point of force application and having a protrusion that engages with the recess, A six-wheeled trolley comprising a first link mechanism that transmits a substantially vertical force applied to the second point of force application to the first transmission member, The aforementioned protrusion is positioned on the circumferential surface of the first transmission member and is connected to the first point of force application at approximately a right angle. The aforementioned freely adjustable fixed caster is, A bracket is attached to the aforementioned trolley frame and is rotatable relative to the trolley frame, The wheel portion attached to the bracket, A recess with a roughly U-shaped cutout is provided on the upper part of the bracket, A gear-shaped gear portion is provided between the wheel portion and the bracket, A stopping member is rotatably mounted on the bracket and engages with the gear portion, The vehicle comprises a rod-shaped member, one end of which is connected to a third point of force application provided on the trolley frame, and the other end of which is connected to the stopping member. The trolley frame is equipped with a second link mechanism that transmits the substantially vertical force applied to the fourth point of force application to the rod-shaped member. By applying force substantially perpendicular to the first or second point of force application, the first transmission member rotates via the first link mechanism, the protrusion separates from the recess, and the bracket becomes rotatable. A six-wheeled trolley characterized in that, by applying force substantially perpendicular to the four points of force application, the rod-shaped member transmits force via the second link mechanism, the stopping part rotates around the bracket, and engages with the gear part.

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