JP7745235B2 - Transport cart - Google Patents

Description

The present invention relates to a transport cart.

Conventionally, by improving the visibility of the brake pedal on a trolley, users can instantly see the brake pedal and instantly operate the brake to brake the trolley.

Japanese Patent Application Laid-Open No. 2019-186445

However, in order to increase the visibility of the brake pedal on such transport trolleys, only the brake pedal protrudes from the trolley body, which can lead to the brake pedal being hit and damaged during normal use, for example, when the transport trolley is turning.

The present invention was made in consideration of the problems described above, and aims to provide a transport cart whose brake pedal is less likely to break.

The transport cart of the present invention is a cart comprising a cart body and casters arranged at at least four corners of the cart body and rotatable around vertical rotation axes, wherein the cart body has a frame and corner members that connect the frame at the four corners of the cart body, and the corner members have insertion holes into which push members are inserted from above and stopper portions that support the push members at a position lower than the lower end of the frame, and the casters have support portions, wheels rotatably supported by the support portions, and brake pedals for fixing the rotation of the wheels, and the brake pedals are The casters have an operating part that is stepped on with the foot, the operating part being located behind the wheels, and the casters located at the four corners , when viewed in a plan view, overlap the trolley main body part without protruding outside the trolley main body part regardless of the turning position, and one of the casters located at the four corners, when viewed in a plan view with the wheel facing in the front-to-rear direction, the operating part overlaps a first frame part of the frame part, and when viewed in a plan view with the wheel facing in the left-to-right direction perpendicular to the front-to-rear direction, the operating part overlaps a second frame part of the frame part .

This invention makes it possible to provide a transport cart with a brake pedal that is less likely to break.

FIG. 2 is a perspective view of the transport cart of the first embodiment. FIG. 2 is a bottom view of the transport cart of the first embodiment. FIG. 2 is a plan view of the transport cart of the first embodiment. FIG. 2 is a rear view of the transport cart of the first embodiment. FIG. 2 is a side view of the transport cart of the first embodiment. FIG. 4 is an enlarged view of a caster of the transport cart of the first embodiment. FIG. 10 is a perspective view of a transport cart according to a second embodiment. FIG. 10 is a bottom view of the transport cart of the second embodiment. FIG. 10 is a plan view of the transport cart of the second embodiment. FIG. 10 is a rear view of the transport cart of the second embodiment. FIG. 10 is a side view of the transport cart of the second embodiment. FIG. 10 is an enlarged view of a caster of the transport cart of the second embodiment. FIG. 10 is a perspective view of a transport cart according to a third embodiment. FIG. 11 is a bottom view of the transport cart of the third embodiment. FIG. 10 is a plan view of the transport cart of the third embodiment. FIG. 11 is a rear view of the transport cart of the third embodiment. FIG. 11 is a side view of the transport cart according to the third embodiment. FIG. 11 is an enlarged view of a caster of the transport cart of the third embodiment. 10A and 10B are diagrams illustrating an example of a configuration of a corner member according to a modified example.

The transport cart according to this embodiment will be described below with reference to the drawings. To facilitate explanation, in each drawing, the upper side is indicated as Up, the lower side as Lo, the right side as Ri, the left side as Le, the front side as Fr, and the rear side as Rr, as necessary. However, the transport cart 100 can travel in any direction, forward, backward, left, or right, on the travel surface.

(First embodiment)
Fig. 1 is a perspective view of the transport vehicle 100. Fig. 2 is a bottom view of the transport vehicle 100. Fig. 3 is a plan view of the transport vehicle 100.
The transport cart 100 comprises a cart body 110, a running section 120, and a push member 130.

The trolley main body 110 is constructed by connecting multiple frame sections and is used to carry transported goods. In a plan view, the trolley main body 110 is roughly rectangular, with the longitudinal direction being the front-to-rear direction and the transverse direction being the left-to-right direction. The trolley main body 110 has a front frame section 111a, a rear frame section 111b, a right frame section 111c, a left frame section 111d, corner members 112, reinforcing frame sections (reinforcing sections) 115a-115c, and a loading section 117.

The front frame portion 111a, rear frame portion 111b, right frame portion 111c, and left frame portion 111d form the exterior of the bogie main body portion 110. The front frame portion 111a and rear frame portion 111b correspond to an example of a pair of opposing frame portions. The right frame portion 111c and left frame portion 111d correspond to an example of a pair of opposing frame portions. The front frame portion 111a, rear frame portion 111b, right frame portion 111c, and left frame portion 111d can be made of, for example, hollow rectangular pipes made of aluminum alloy.

4 is a rear view of the transport cart 100. FIG. 5 is a side view of the transport cart 100.
The corner member 112 is made of, for example, an aluminum alloy formed by extrusion molding. The corner member 112 has an insertion hole 113 that opens to the top and a stopper portion 114 that closes the bottom. A push member 130 can be inserted into the insertion hole 113 of the corner member 112. The lower end of the push member 130 inserted into the insertion hole 113 is supported by the stopper portion 114.

Here, the corner member 112 is generally trapezoidal in side and rear views, with the height of the portion where the insertion hole 113 is located being greater than the height of the portion where it is connected to the frame portion. As seen in Figures 4 and 5, the depth of the insertion hole 113 is deeper than the frame portions that make up the outer shape of the cart main body 110. In other words, the stopper portion 114 is located at a position lower than the bottom end of the cart main body 110 and supports the push member 130.

The front frame portion 111a, the rear frame portion 111b, the right frame portion 111c, and the left frame portion 111d are joined at their four corners by corner members 112 to form a rectangular four-sided frame. The interior of the frame is reinforced by a plurality of reinforcing frame portions 115a, 115b, and 115c that are butted together in the front-rear and left-right directions and joined with screws, rivets, welding, or the like. The reinforcing frame portions 115a, 115b, and 115c may be, for example, rectangular hollow pipes or plates with uneven cross sections made of aluminum alloy. Here, by joining two reinforcing frame portions 115a, 115b that are long in the front-rear direction to twelve reinforcing frame portions 115c that are short in the left-right direction, a plurality of rectangular spaces 116 are formed that are divided into three rows in the front-rear direction and five rows in the left-right direction in a plan view.
Furthermore, the carriage body 110 has a mounting section 117 attached to the upper part of each of the spaces 116 that are not blocked by mounting members 122A and 122B (described later). The mounting section 117 is a flat metal plate on which an object to be transported is placed. The mounting section 117 is connected to each frame section and each reinforcing frame section with rivets or screws. When the same carriages 100 are stacked, portions of casters 121A and 121B (described later) of the upper carriage 100 enter into the spaces 116 that are not blocked by the mounting section 117, i.e., the spaces 116 that are open at the top.

The running section 120 runs on the running surface while supporting the load of the carriage body section 110 and the transported object.
The running unit 120 has a plurality of casters 121A, 121B. As shown in Fig. 2, the running unit 120 has six casters: four casters 121A arranged at the four corners of the bogie body 110 and two casters 121B arranged at the center in the front-to-rear direction and spaced apart on the left and right. The casters 121A, 121B are attached to the bogie body 110 via mounting members 122A, 122B connected to the respective frame portions and reinforcing frame portions in a manner that closes the space 116 from below. The casters 121A, 121B are rotatable about a rotation axis O1 that extends in the up-down direction.

Here, the casters 121A located at the four corners are brake-equipped casters that can be braked or released in response to user operation. Meanwhile, the caster 121B located in the center is a brakeless caster. The configuration of caster 121A is described below. Caster 121B is a configuration in which the brake function is omitted from caster 121A, and a detailed description thereof will be omitted.

6 is an enlarged view of the caster 121A, in which the corner member 112 is indicated by a two-dot chain line.
As shown in FIGS. 5 and 6 , the caster 121A includes a wheel 123 , a support portion 124 , a brake pedal 127 , and a swivel portion 129 .
The wheel 123 has a wheel portion with a built-in bearing and a tire portion fitted onto the outer periphery of the wheel portion.

The support portion 124 rotatably supports the wheel 123 via an axle. The support portion 124 has a fork member 125 that supports the wheel 123, and a pedal holding member 126 that holds a brake pedal 127 so that the brake pedal 127 can swing.
Fork member 125 is formed, for example, by press-forming a steel plate. Fork member 125 is integrally formed with a pair of side walls located on both sides of wheel 123 and a circular top plate that connects the pair of side walls above wheel 123. The top plate is rotatably held by swivel portion 129.

The pedal holding member 126 is formed, for example, by press-forming a steel plate. The pedal holding member 126 is integrally formed with a pair of side walls located on either side of the wheel 123 and fixed to the fork member 125, and a connecting plate that connects the pair of side walls at the top.

The brake pedal 127 prevents the wheels 123 from rotating. The brake pedal 127 is formed, for example, by press-forming a steel plate. The brake pedal 127 can swing up and down relative to the pedal holding member 126. The brake pedal 127 has an operating unit 128. The operating unit 128 is generally plate-shaped, and the user's foot or other device operates the brake pedal 127 to swing up and down. The operating unit 128 is located behind the wheels 123, more specifically, behind the rear ends of the wheels 123, so that it is easy for the user to operate when the wheels 123 are facing forward and backward.

When the brake is released, the brake pedal 127 is in a raised position. On the other hand, when the user operates the operating portion 128 of the brake pedal 127 by depressing it downward with their foot, the brake pedal 127 swings downward against the bias of the spring, as shown by the two-dot chain line in Figure 6. As the brake pedal 127 moves, the brake pedal 127 directly or indirectly presses firmly against the outer circumferential surface of the wheel 123, preventing the wheel 123 from rotating and placing the brake in an applied state. Furthermore, the brake pedal 127 functions as a stopper because it is maintained in the applied state.
The rotating portion 129 rotates the wheels 123, the support portion 124, and the brake pedal 127.

While caster 121A has been described here, caster 121B is configured in such a way that the brake-related components of caster 121A are omitted. That is, caster 121B has wheel 123, support portion 124, and swivel portion 129, but does not have brake pedal 127. Therefore, like caster 121A, caster 121B can swivel around pivot axis O1 via the top plate of fork member 125, but cannot be braked.

The casters 121A, 121B can be attached to the cart main body 110 by attaching the swivel portions 129 of the casters 121A, 121B configured in this manner to the mounting members 122A, 122B at predetermined positions on the cart main body 110 with rivets or screws.
The casters 121A and 121B are set at positions where the ground contact position of the wheels 123 and the rotation axis O1 are eccentric in a plan view. Therefore, the casters 121A and 121B rotate around the rotation axis O1 so that the wheels 123 are on the rear side relative to the front side, which is the direction of travel.

Here, as shown in Figures 2 and 6, when the rear caster 121A is viewed in a plan view with the wheel 123 facing forward and backward, the operating unit 128 is positioned so that it overlaps with the bogie main body 110. Specifically, when viewed in a plan view, the operating unit 128 is positioned so that it overlaps with the rear frame portion 111b of the bogie main body 110. In other words, the rear end (rear end of the operating unit 128) of the brake pedal 127 is positioned forward of the rear end of the bogie main body 110, so that it does not protrude from the rear end of the bogie main body 110. This prevents the brake pedal 127 from coming into contact with an obstacle and being damaged.

In addition, in Figure 2, the trajectory T1 of the component of caster 121A (brake pedal 127) that is farthest from the pivot axis O1 when caster 121A pivots around pivot axis O1 is shown by a dashed dotted line. Also, the trajectory T1' of the component of caster 121B (wheel 123) that is farthest from the pivot axis O1 when caster 121B pivots around pivot axis O1 is shown by a dashed dotted line.

Here, the entire trajectory T1 is inside the bogie main body 110 in a bottom view. In other words, when the caster 121A rotates, it overlaps with the bogie main body 110 in a plan view regardless of its position. In other words, the operating part 128 of the brake pedal 127 does not protrude from the bogie main body 110, thereby preventing the brake pedal 127 from coming into contact with an obstacle and being damaged. On the other hand, the trajectory T1 does not overlap with the insertion hole 113 of the corner member 112 or the handrail member 130 inserted into the insertion hole 113. The predetermined positions for attaching the mounting member 122A are the four corner positions of the bogie main body 110 where the trajectory T1 follows the trajectory described above.

In addition, because caster 121B does not have any brake-related components, it can be located anywhere in the center of the bogie main body 110, as shown in Figure 2. However, caster 121B may have the same configuration as caster 121A. In this case, the trajectory T1' when caster 121B is attached will be the same as the trajectory T1 when caster 121A is attached. In other words, the specified position for attaching mounting member 122B is the center of the bogie main body 110 so that when rotated, it overlaps with the bogie main body 110 in a plan view regardless of the position.

The push member 130 is a member that the user holds onto when moving the transport cart 100. The user moves the transport cart 100 by grasping the push member 130 and pushing or pulling it. The push member 130 is attached to the cart body 110 by inserting its lower end into the insertion hole 113 of the corner member 112. The transport cart 100 has four push members 130, which are inserted into the insertion hole 113 of each corner member 112. All four push members 130 have approximately the same configuration. However, the number of push members 130 is not limited to four; one, two, or three push members 130 may also be attached. The push members 130 can be removed from the cart body 110 by pulling them out of the insertion holes 113 of the corner members 112.

The push member 130 has a main body member 131 as a main body portion, a protective member 133, and a reinforcing member 134.
The main body member 131 is a rod-shaped or long, pipe-shaped member. The main body member 131 is made of, for example, an aluminum alloy and formed by extrusion molding. The main body member 131 has a metallic color such as silver. The inside of the main body member 131 is reinforced in a cross shape to improve its strength.

The protective member 133 protects the user's hands from coming into contact with surrounding objects when the user grasps the push member 130. The protective member 133 also serves as an indicator of the maximum loading height when loading transported items. The protective member 133 is fixed to the upper side of the main body member 131 at a predetermined distance from the top end with bolts, rivets, etc. The portion of the push member 130 above the protective member 133 functions as a grip portion that the user grasps with their hands. The protective member 133 is disc-shaped and protrudes outward from the outer periphery of the main body member 131, and has a larger outer diameter than the main body member 131.

The reinforcing member 134 is fixed to the lower end of the main body member 131, specifically at a position close to the lower end, with bolts, rivets, etc. The reinforcing member 134 not only reinforces the strength of the main body member 131, but also prevents rattling between the main body member 131 and the insertion hole 113 of the corner member 112 when the main body member 131 is inserted into the insertion hole 113. The reinforcing member 134 is made of, for example, an aluminum alloy and is formed by extrusion molding.

As such, the transport cart 100 of this embodiment is equipped with casters 121A that follow a trajectory T1 that overlaps with the cart main body 110 in a bottom view, regardless of the rotation position. In other words, when the transport cart 100 is viewed from above, the cart main body 110 and the operating part 128 of the brake pedal 127 overlap. Therefore, when the transport cart 100 is moved, the operating part 128 comes into contact with the cart main body 110 before coming into contact with the operating part 128, thereby reducing contact between the operating part 128 and an obstacle that could cause damage to the operating part 128.

In addition, in the transport cart 100 of this embodiment, the trajectory T1 does not overlap the insertion hole 113 of the corner member 112 or the handhold member 130 inserted into the insertion hole 112, so the operating unit 128 does not interfere with the push member 130, improving the design freedom of the corner member 112. However, the trajectory T1 may also overlap the insertion hole 113 of the corner member 112 or the handhold member 130 inserted into the insertion hole 112.

Second Embodiment
Fig. 7 is a perspective view of the transport cart 200. Fig. 8 is a bottom view of the transport cart 200. Fig. 9 is a plan view of the transport cart 200. Fig. 10 is a rear view of the transport cart 200. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof will be omitted as appropriate.
The running unit 220 has a plurality of casters 221A, 121B. As shown in Fig. 8, the running unit 220 has six casters: four casters 221A arranged at the four corners of the carriage body 110 and two casters 121B arranged at the center in the front-to-rear direction and spaced apart on the left and right. The caster 221A can rotate around a rotation axis O2 along the up-down direction.

Here, the casters 221A located at the four corners are braked casters that can be braked or released according to the user's operation.

As shown in Figures 11 and 12, the caster 221A has a wheel 123, a support portion 224, a brake pedal 127, and a swivel portion 129.

The support portion 224 rotatably supports the wheel 123 via an axle. The support portion 224 has a fork member 225 that supports the wheel 123, and a pedal holding member 126 that holds the brake pedal 127 so that it can swing.
The fork member 225 is formed, for example, by press-forming a steel plate. The fork member 225 is integrally formed with a pair of side walls located on both sides of the wheel 123 and a circular top plate that connects the pair of side walls above the wheel 123.

In Figure 8, when the caster 221A rotates around the pivot axis O2, the locus of the component of the caster 221A (brake pedal 127) that is farthest from the pivot axis O2 is shown as locus T2, indicated by a dashed line. Similarly, the locus of the part of the wheel 123 that is farthest from the pivot axis O2 is shown as locus T2', indicated by a dashed line. For this reason, locus T2 is a larger locus than locus T2'.

The swivel portions 229 of the casters 221A can be attached to the mounting members 222A at predetermined positions on the carriage body 110 with rivets or screws.
Here, the specified position is a position where the caster 221A can rotate, and when viewed from above, the caster 221A is facing forward/backward or left/right, and at least a portion of the wheel 123 and the operating unit 128 do not overlap with the trolley main body 110.
11 and 12, when the transport cart 200 is viewed from the side, the pivot axis O2 and the pedal holding member 126 sandwich the fork member 225, and thus have a certain distance l1 between them. Similarly, there is also a maximum distance l3 between the wheels 123. In this case, the size of the distance l1 can be adjusted to adjust the size of the distance l, which is the sum of the distance l2 between the pedal holding member 126 and the brake pedal 127 in a direction horizontal to the floor, and the size of the maximum distance l' between the wheels 123 in a direction horizontal to the floor.
That is, the size of the loci T2 and T2' depends on the size of the distance l1, and the size of the distance l1 depends on the size of the fork member 225.
When caster 221A is viewed in a plan view facing the front-to-rear or left-to-right direction, at least a portion of wheel 123 and operating unit 128 do not overlap with cart main body 110. Therefore, distance 11 is set to a size such that trajectories T2 and T2′ do not overlap with cart main body 110.

In this way, in the transport cart 200 of this embodiment, at least a portion of the wheels 123 and the operating unit 128 are located outside the cart main body 110. Therefore, when an obstacle comes into contact with the operating unit 128, it comes into contact not only with the operating unit 128 but also with the wheels 123, thereby dispersing the force acting on the operating unit 128 and preventing it from being subjected to damaging forces.

(Third embodiment)
Fig. 13 is a perspective view of the transport cart 300. Fig. 14 is a bottom view of the transport cart 300. Fig. 15 is a plan view of the transport cart 300. Fig. 16 is a rear view of the transport cart 300. Fig. 17 is a side view of the transport cart 300. Note that the same components as those in the first and second embodiments are designated by the same reference numerals, and descriptions thereof will be omitted as appropriate.

The corner member 312 is made of, for example, an aluminum alloy formed by extrusion molding. The corner member 312 has an insertion hole 313 that opens to the top and a stopper portion 314 that closes the bottom.

Fig. 18 is an enlarged view of the casters of the transport cart 300. In Fig. 18, the corner members 312 are indicated by two-dot chain lines.
The corner member 312 is a generally L-shaped member in a plan view, and is generally rectangular in a side, front, and rear view. The push member 130 can be inserted into the insertion hole 313 of the corner member 312. The lower end of the push member 130 inserted into the insertion hole 313 is supported by a stopper portion 314.
Here, the corner member 312 has a rectangular shape in side and rear views, with the height dimension of the portion where the insertion hole 313 is located being the same as the height dimension of the portion where it is joined to the frame. The push member 130 is supported at least at the lower end of the frame portion of the cart main body 110. In other words, the stopper portion 314 is installed at the same height as the lower end of the frame portion of the cart main body 110, and supports the push member 130. Furthermore, at least the operating portion 128 of the caster 121A is located at a lower position than the corner member 312.

Furthermore, the stopper portion 314 of the corner member 312 does not have to support the push member 130 at the lower end of the frame portion, but may be located at any position in the insertion hole 313 as long as it supports the push member 130 at a position above the lower end of the frame portion. For example, the stopper portion 314 may be located midway through the insertion hole 313 to support the push member 130. In this case, at least the operating portion 128 of the caster 121A is located at a lower position than the corner member 312.

Furthermore, the casters 121A and 121B of the transport cart 300 can rotate around a rotation axis O1.
14, the dashed-dotted line indicates a locus T3 of the component of the caster 121A (the brake pedal 127) that is farthest from the pivot axis O1 when the caster 121A pivots about the pivot axis O1. The dashed-dotted line also indicates a locus T1' of the component of the caster 121B (the wheel 123) that is farthest from the pivot axis O1 when the caster 121B pivots about the pivot axis O1.
The swivel axis O1 of the casters 121A, 121B is set so that when facing the front-rear or left-right direction, a portion of the casters 121A, 121B does not overlap with the cart main body 110 in a plan view. In other words, the mounting positions of the casters 121A, 121B are also determined based on this, but other positions are also possible. Furthermore, although the locus T3 overlaps with the insertion hole 313 of the corner member 312 or the handrail member 130 inserted into the insertion hole 313, the corner portion 312 has the insertion hole 313 supported at the lower end of the frame portion or at a position above the lower end, so that the operating unit 128 does not come into contact with the corner portion 312.

In this way, the transport cart 300 of this embodiment does not have any components other than the running section 120 below the bottom end position of the cart main body 110, and even when the casters 121A, 121B rotate, they do not come into contact with other components of the transport cart 300. This reduces contact with other components that could cause damage to the brake pedal 127.

The present invention has been described above using various embodiments, but the present invention is not limited to the above-described embodiments, and modifications and variations are possible within the scope of the present invention, and the embodiments and variations may be combined as appropriate.
For example, the transport cart 200 may be provided with corner members 312 .

In the above-described embodiment, the corner members 112 and 312 are used, but the present invention is not limited to this.
Fig. 19(a) is a perspective view of a modified corner member 412, and Fig. 19(b) is a plan view of the modified corner member 412. In Fig. 19(a), a portion of the side wall of the corner member 412 is cut away as shown by the dashed dotted line so that the interior of the insertion hole 413 can be seen.
The corner member 412 has a cylindrical portion 414 , connecting portions 415 a and 415 b , and a stopper portion 416 .

An insertion hole 413 is formed inside the cylindrical portion 414 in the vertical direction. The height of the lower end of the cylindrical portion 414 is approximately the same as the height of the lower end of the bogie main body 110. On the other hand, the height of the upper end of the cylindrical portion 414 is higher than the height of the upper end of the bogie main body 110.
The connecting portions 415a, 415b connect two adjacent frame portions among the front frame portion 111a, the rear frame portion 111b, the right frame portion 111c, and the left frame portion 111d using bolts, rivets, welding, etc. The connecting portions 415a, 415b extend perpendicularly from the tubular portion 414 and are each composed of a pair of parallel side walls. The front frame portion 111a, the rear frame portion 111b, the right frame portion 111c, and the left frame portion 111d are connected while being sandwiched between the pair of side walls of the connecting portions 415a, 415b. The height of the lower ends of the connecting portions 415a, 415b is approximately the same as the height of the lower end of the bogie main body 110. On the other hand, the height of the upper ends of the connecting portions 415 a and 415 b gradually decreases from a point approximately equal to the height of the upper end of the cylindrical portion 414 to a point approximately equal to the height of the upper end of the carriage main body portion 110 .

The stopper portion 416 supports the push member 140 inserted into the insertion hole 413. The stopper portion 416 has a shaft member 417 and a fixing member 418. The shaft member 417 is, for example, a bolt, and the fixing member 418 is, for example, a nut. Opposing side walls of the cylindrical portion 414 are each formed with an insertion hole for inserting the shaft member 417, and the shaft member 417 is positioned so that it crosses the insertion hole 413 by inserting it through the insertion hole in a substantially horizontal direction. The fixing member 418 fixes the shaft member 417 on the outside of the cylindrical portion 414 to prevent the shaft member 417 from coming off the cylindrical portion 414. Specifically, the fixing member 418 is screwed into the threaded portion of the shaft member 417, thereby fixing the shaft member 417 to the cylindrical portion 414.

The push member 140 has a main body member 141 that can be inserted into the insertion hole 413. By inserting the push member 140 into the insertion hole 123, the lower end of the push member 140 is supported by the stopper portion 416. The stopper portion 416 supports the push member 140 at a position higher than the lower ends of the front frame portion 111a, rear frame portion 111b, right frame portion 111c, and left frame portion 111d. Even in this case, the upper end of the corner member 412 is higher than the upper ends of the trolley body 110 or the front frame portion 111a, rear frame portion 111b, right frame portion 111c, and left frame portion 111d, thereby preventing the insertion hole 413 from becoming shallow. While the modified example described above uses a bolt as the shaft member 417, the shaft member 417 may be a rivet, and the fixing member 418 may be formed by crimping the tip of the rivet. In addition, in a modified example, the push member 140 does not have a reinforcing member 134, but may have a reinforcing member 134.

100, 200, 300: Transport cart 110: Cart body 121, 221: Caster 112, 312, 412: Corner member 114, 314, 416: Stopper portion 125, 225: Fork member 126: Pedal holding member 127: Brake pedal 111a, 111b, 111c: Frame portion T1, T1', T2, T2': Trajectory 116: Space 117: Placement portion 124, 224: Support portion 123: Wheel 122A, 122B, 222A, 222B: Mounting member 130, 140: Push member O1, O2: Swivel shaft 129, 229: Swivel portion 113, 313, 413: Insertion hole 128: Operation portion 120, 220: Running section 133: Protective member 115: Reinforcing frame 134: Reinforcing member 131: Main body member l, l1, l2, l3: Distance

Claims (4)

A bogie main body;
A transport cart comprising: casters arranged at at least four corners of the cart body and rotatable around a rotation axis along a vertical direction;
The bogie main body includes a frame portion and corner members that connect the frame portions to each other at four corners of the bogie main body,
The corner member has an insertion hole into which the push member is inserted from above, and a stopper portion that supports the push member at a position lower than the lower end of the frame portion,
The caster includes a support portion, a wheel rotatably supported by the support portion, and a brake pedal for fixing the rotation of the wheel,
The brake pedal has an operating portion that is depressed by a foot,
The operating unit is located rearward of the wheels,
The casters located at the four corners are:
When viewed in a plan view, the operating unit overlaps with the carriage body unit without protruding outside the carriage body unit at any rotation position,
One of the casters located at the four corners is
When the wheel is oriented in the front-rear direction in a plan view, the operation unit overlaps with a first frame portion of the frame portion,
A transport cart characterized in that, when viewed in a plan view with the wheels facing left and right, perpendicular to the front and rear direction, the operating unit overlaps with a second frame portion of the frame portion . The casters located at the four corners are:
2. The transporting cart according to claim 1 , wherein the operating portion does not overlap with the insertion hole when viewed from the bottom, regardless of the rotation position. The casters located at the four corners are:
3. The transport cart according to claim 1, wherein, when viewed from the bottom, the operating portion does not overlap the push member inserted into the insertion hole, regardless of the rotation position. If the casters located at the four corners are called first casters,
The transport cart is
a pair of second casters positioned laterally apart between the pair of first casters positioned at the front side and the pair of first casters positioned at the rear side;
The pair of second casters are
The carriage can be rotated around a rotation axis along the vertical direction, and when viewed in a plan view, the carriage overlaps the carriage body without protruding outside the carriage body at any rotation position,
When the first caster turns, the circle of the locus of the member of the first caster that is farthest from the turning axis of the first caster is
4. The transport cart according to claim 1, wherein when the second caster is rotated, the circle of the locus is larger than the circle of the member of the second caster that is farthest from the rotation axis of the second caster.