JP7742599B2 - Transport cart - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies (1) Publication date January 31, 2020 Publication Product brochure <Materials> Product brochure (2) Leasing start date (publication date) January 31, 2020 (Yokohama) February 4, 2020 (Tokyo) Leasing location (Yokohama) Taiko Bussan Co., Ltd. Yokohama Branch Yokohama Equipment Center (Tokyo) Taiko Bussan Co., Ltd. Tokyo Branch Tokyo Equipment Center

This invention relates to a transport cart that has a loading platform for loading cargo and multiple casters arranged under the loading platform.

As is well known, various transport carts are used to transport loads at construction sites and the like.
Such a transport cart includes a load receiving platform, a support member erected from the load receiving platform, and a plurality of casters arranged below the load receiving platform.
Furthermore, some of these transport carts are capable of carrying heavier loads than conventional models by arranging three pairs of casters (six in total) at symmetrical positions on the underside of the front, center, and rear sides of the loading platform (see, for example, Patent Document 1).

In addition, there are various types of support members erected from the loading platform. To improve safety during transport work using a transport cart, for example, protective members (such as ring-shaped members extending outward from the support members) are attached to the support members. This protects the hands of the transport worker holding the support members from being pinched between surrounding walls or pillars, or from being bruised by collisions, etc., and thereby improves safety during transport work. Transport carts that improve safety during transport work have been disclosed (see, for example, Patent Document 2).

Patent No. 6244577 Japanese Patent Application Laid-Open No. 2019-147561

However, when the transport carts disclosed in Patent Document 2 are transporting heavy loads, if the carts collide with each other and the support members (protective members) collide with each other, there is a risk that the support members will bend and the transport cart will be damaged.

Furthermore, if a worker is so focused on the carrying operation that their fingers or other parts of their body come into contact with the outer surface of the protective member, there is a risk that their fingers may get caught when carrying the product through narrow spaces between pillars, such as entrances and exits.
On the other hand, when a transport worker changes hands during transport work, they must avoid the protective member and grasp the support member, which inevitably reduces workability and convenience during transport work.

Furthermore, with transport carts that have insertable support members, it is possible to store the removed support members and the transport cart itself separately, but with transport carts where the support members tilt relative to the loading platform, it is difficult to store the support members.

The present invention was made in consideration of these circumstances, and aims to provide a transport cart that can improve safety during transport operations.

In order to solve the above problems, the present invention proposes the following means.
The invention described in claim 1 is a transport cart comprising a cargo receiving platform formed in a rectangular shape in a plan view for loading cargo, a support member erected relative to the cargo receiving platform, a plurality of casters arranged at the bottom of the cargo receiving platform and having wheel portions that are freely rotatable around an axle, and corner guard members arranged at the corners of the outer contour formed by the cargo receiving platform and the support member when viewed in a plan view, and protruding outward from the outer contour.

The transport cart of this invention is equipped with a load receiving platform, support members erected on the load receiving platform, multiple casters positioned below the load receiving platform, and corner guard members that are positioned at the corners of the outer contour formed by the load receiving platform and support members when viewed from above and protrude outward from the outer contour. Therefore, when the transport cart collides with walls, pillars, etc. surrounding the transport operation, or with other transport carts, the load receiving platform and support members are prevented from coming into direct contact with the other object, and the load receiving platform and support members are prevented from receiving a large impact.

In addition, when the transport cart collides with a wall, pillar, etc., or with another transport cart, the corner guard member forms a gap between the wall, pillar, or support pillar of the cart that has been hit, preventing the hands holding the support pillar member from coming into direct contact with these.
As a result, safety during transportation work can be improved.
Furthermore, since the support members can be easily changed during transportation, the workability during transportation can be prevented from decreasing.

Here, the outer contour of the loading platform and the support members refers to the outer contour of the transport cart without corner guard members when viewed from above, specifically the outer contour of the loading platform and the support members (including the support holders if the loading platform is held by the support holders).
Furthermore, the corners of the outer contour portion correspond to the corners of the cargo receiving platform when the outer contour portion coincides with the outer contour of the cargo receiving platform, for example, when the support pillar holding portion is positioned inside the cargo receiving platform when viewed in plan, and when the support pillar holding portion is positioned overlapping the corner of the cargo receiving platform when viewed in plan, the corners where the parts positioned outward in both the front-to-back and width directions intersect correspond to the corners of the cargo receiving platform, and when a corner guard member is positioned, the corners of the cargo receiving platform correspond to the corners of the cargo receiving platform when the support pillar holding portion is positioned inside the corner guard member or when the support pillar member is positioned closer to the center of the cargo receiving platform in the longitudinal or width directions than the corner guard member.

The invention described in claim 2 is the transport cart described in claim 1, characterized in that the corner guard members are arranged at the four corners of the outer contour portion.

According to the transport cart of this invention, corner guard members are arranged at the four corners of the outer contour portion, so that when the transport cart collides, the corner guard members collide first, thereby mitigating the impact on the cargo receiving platform and support members.
Furthermore, regardless of which of the four corners the transporting worker is holding onto, the worker's hand is prevented from getting pinched, thereby improving safety during transport work.

The invention described in claim 3 is the transport cart described in claim 1 or 2, characterized in that the corner guard member has multiple recesses formed on the surface positioned on the outside when viewed from above, recessed toward the outer contour portion.

According to the transport cart of this invention, the corner guard member has a plurality of recesses formed therein that are recessed from the surface positioned on the outside when viewed in a plane toward the outer contour portion, and therefore, on the outer surface of the corner guard member, wall portions are formed between the recesses that extend from the inside toward the outer peripheral surface (the surface positioned on the outside).
As a result, the impact when the transport cart collides can be effectively alleviated.

The invention described in claim 4 is a transport cart described in any one of claims 1 to 3, characterized in that the upper surface of the corner guard member is formed flush with the load receiving platform.

With the transport cart of this invention, the upper surface of the corner guard member is formed flush with the upper surface of the cargo receiving platform, preventing the corner guard member from getting in the way when loading cargo onto the cargo receiving platform. Even when cargo is loaded on top of the corner guard member, the cargo can be loaded stably.

The invention described in claim 5 is a transport cart described in any one of claims 1 to 4, characterized in that the corner guard member has an engaging portion, and is configured so that the engaging portion can be held by the outer contour portion by engaging with an engaged portion formed on the outer contour portion.

According to the transport cart of this invention, the corner guard member is provided with an engaging portion and is configured so that the engaging portion can be engaged with an engaged portion formed on the outer contour portion (load receiving platform, support member) and held on the outer contour portion, thereby preventing the corner guard member from peeling off (coming off) from the outer contour portion (load receiving platform, support member).
As a result, safety during transportation work can be stably improved.

The invention described in claim 6 is a transport cart described in any one of claims 1 to 5, characterized in that the support member is rotatably supported by a support shaft and is configured to be able to stand upright or tilt relative to the load receiving platform.

With the transport cart of this invention, the support members are rotatably supported by support shafts formed on the load receiving platform or the support member holder, and are configured to be able to stand upright or tilt relative to the load receiving platform. Therefore, by tilting the support members, the space occupied by the transport cart can be reduced.

The invention described in claim 7 is a transport cart described in any one of claims 1 to 5, characterized in that the support member is configured to be insertable into a support holder formed on the cargo receiving platform.

With the transport cart of this invention, the support members are configured to be insertable into support holders formed on the cargo receiving platform, so the space occupied by the transport cart can be reduced by removing the support members.

The invention described in claim 8 is a transport cart described in any one of claims 1 to 7, characterized in that it has three pairs of casters arranged along the front-to-rear direction of the loading platform, and the caster arranged in the center of the three pairs of casters in the front-to-rear direction is configured so that the wheel portion can be raised and lowered relative to the floor surface.

The transport cart of this invention is equipped with three pairs of casters arranged along the front-to-rear direction of the loading platform, and the caster located in the center of the three pairs in the front-to-rear direction is configured so that the wheel section can be raised and lowered relative to the floor surface. This caster can be raised as needed for the transport work, improving workability and safety during the transport work.

The transport cart of this invention can improve safety during transport operations.

1 is a perspective view illustrating a state in which support members are erected, illustrating the schematic configuration of a transport cart according to a first embodiment of the present invention. FIG. FIG. 2 is a perspective view illustrating a state in which a support member is tilted, illustrating the schematic configuration of the transportation cart according to the first embodiment. 1 is a side view illustrating a schematic configuration of a transport cart according to a first embodiment. FIG. 1 is a front view illustrating a schematic configuration of a transport cart according to a first embodiment. FIG. FIG. 1 is a plan view illustrating a schematic configuration of a transportation cart according to a first embodiment. FIG. 4 is an enlarged perspective view illustrating details of a corner guide member of the transportation cart according to the first embodiment. FIG. 4 is a plan view illustrating details of a corner guide member of the transportation cart according to the first embodiment. FIG. 4 is a front view illustrating details of a corner guide member of the transportation cart according to the first embodiment. FIG. 4 is a side view illustrating details of a corner guide member of the transportation cart according to the first embodiment. FIG. 2 is a conceptual diagram illustrating the general configuration of a swing mechanism of a fixed-wheel caster of the transport cart according to the first embodiment, as viewed from the front. FIG. 2 is a conceptual diagram illustrating the general configuration of a swing mechanism of a fixed-wheel caster of the transport cart according to the first embodiment, as viewed from the side. FIG. 2 is a perspective view illustrating an outline of a state in which the transport carts according to the first embodiment are stacked and loaded. FIG. 10 is a perspective view illustrating a state in which support members are erected, illustrating the schematic configuration of a transport cart according to a second embodiment of the present invention. FIG. 10 is a front view illustrating a schematic configuration of a transport cart according to a third embodiment of the present invention. FIG. 10 is a plan view illustrating a schematic configuration of a transport cart according to a fourth embodiment of the present invention. FIG. 11 is a plan view illustrating a schematic configuration of a transport cart according to a fifth embodiment of the present invention. FIG. 13 is a plan view illustrating a schematic configuration of a transport cart according to a sixth embodiment of the present invention. FIG. 13 is a plan view illustrating a schematic configuration of a transport cart according to a seventh embodiment of the present invention.

First Embodiment
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 11. FIG.
Figures 1 to 5 are diagrams illustrating the schematic configuration of the transport cart according to the first embodiment, with Figure 1 being a perspective view showing the support members in an upright position, Figure 2 being a perspective view showing the support members in a tilted position, Figure 3 being a side view, Figure 4 being a front view, and Figure 5 being a plan view. Figures 6 to 9 are diagrams illustrating the details of the corner guard members.

In the figure, reference numeral 100 denotes the transport cart, reference numeral 10 denotes the load receiving platform, reference numeral 12 denotes the support post holder, reference numeral 17 denotes the casters, reference numeral 20 denotes the support members, and reference numeral 30 denotes the corner guard members. Reference numeral 10A denotes the load receiving surface (upper surface), reference numeral 10B denotes the underside of the load receiving platform, and reference numerals 10U and 10V denote caster storage sections. Reference numeral 17C denotes the liftable wheel support section. Reference numeral C denotes the outer contour. Note that the outer contour C is the contour defined by the load receiving platform and support post holder when viewed in plan, but is shown spaced apart from these for ease of identification.

As shown in Figures 1 to 7, the transport cart 100 includes, for example, a load receiving platform 10, a support pole holder 12, an insert pin (locking member) 15, casters 17, a support pole receiving bracket 18, a support pole member 20, and a corner guard member 30.

Furthermore, as shown in Figures 1 to 5, the transport cart 100 is configured such that, for example, by extracting the support member 20 from the support holding portion 12 and tilting it, the support member 20 is supported at its free end F by the support receiving bracket 18 on the side of the loading platform 10, and the support member 20 is raised and inserted into the support holding portion 12 and held by the support holding portion 12, so that the support member 20 is erected relative to the loading platform 10.
The erected support members 20 are used as handrails, and the luggage loaded on the luggage receiving platform 10 can be transported by the casters 17.

The loading platform 10 is formed in a rectangular shape in plan view, for example, with a thickness (vertical dimension) of 60 mm, a front-rear dimension of 1000 mm, and a width dimension of 600 mm.
The receiving platform 10 has a receiving surface (upper surface of the receiving platform) 10A on which cargo is loaded and a lower surface 10B.

Specifically, for example, the surrounding frame member is formed from aluminum alloy square timber (square pipe) (e.g., 60 mm x 60 mm), an aluminum alloy plate forming the load receiving surface (upper surface) 10A is welded to the top of the frame member, and an aluminum alloy plate forming the lower surface 10B of the load receiving platform 10 is welded to the underside of the frame member.
In addition, the lower surface 10B of the loading platform 10 is, for example, a surface that is positioned lower than the frame member.

In this embodiment, as shown in Figures 1 to 3, the casters 17 are arranged in three pairs (six in total) at symmetrical positions on the underside 10B of the front side F, center, and rear side R along the fore-and-aft direction of the loading platform 10.
The casters 17 include, for example, free-wheel casters 171 and fixed-wheel casters 172 .

The free-wheel casters 171 and fixed-wheel casters 172 can be positioned as desired relative to the loading platform 10, but in this embodiment, the free-wheel casters 171 (17) are positioned on the front side F and rear side R of the loading platform 10, and the fixed-wheel casters 172 (17) are positioned in the center of the loading platform 10 in the fore-and-aft direction.

The free wheel caster 171 (17) includes, for example, a wheel portion 17A, a wheel support portion 17B, and an axle 17D.
The wheel support portion 17B rotatably supports the wheel portion 17A, and is configured to allow the wheel portion 17A to rotate around a rotation axis (not shown) formed in the vertical direction.
It should be noted that the free wheel caster 171 may be a known one.

The fixed-wheel caster 172 includes, for example, a wheel portion 17A, a liftable wheel support portion 17C, and an axle 17D.
The liftable wheel support section 17C rotatably supports the wheel section 17A and holds the wheel section 17A so that it can move only in a certain direction (the front-to-rear direction of the transport cart 100).

Whether or not the fixed-wheel caster 172 has a liftable wheel holder 17C can be set as desired, but for example, when the fixed-wheel caster 172 (17) is raised, the free-wheel caster 171 can easily move the transport cart 100 laterally, which is advantageous.
In this embodiment, the liftable wheel support portion 17C can be moved by a swing mechanism (caster lifting mechanism) described later.

Furthermore, as shown in Figures 2, 3, and 5, when the support member 20 is tilted and laid down, the transport cart 100 is configured so that the upper side surface 20A of the support member 20 is positioned lower than the load receiving surface (upper surface of the load receiving platform) 10A, and the lower side surface 20B of the support member 20 is positioned higher than the lower surface 10B of the load receiving platform.

As shown in FIGS. 1, 2 and 5, the transporting cart 100 has, for example, a storage section 10U and a caster storage section 10V formed on the loading platform 10.
The caster storage section 10U is formed, for example, on the load receiving surface (upper surface) 10A on the front side F and rear side R of the load receiving platform 10. Specifically, a hole that is formed in the aluminum alloy plate that forms the load receiving surface (upper surface) 10A and has a rectangular opening in a plan view is configured as a recess (space) that is formed to a depth (dimension) that reaches the aluminum alloy plate that forms the lower surface 10B of the load receiving platform 10.
Furthermore, the length and width in the front-rear direction of the caster storage section 10U are such that the caster 171 (17) can be stored even if it is tilted relative to the front-rear direction.

Caster storage section 10V is formed, for example, on load receiving surface (upper surface) 10A in the center in the front-to-rear direction of load receiving platform 10. In this embodiment, as shown in Fig. 5, for example, a recess that opens into load receiving surface (upper surface) 10A and forms caster storage section 10U, and caster guide member 10G disposed in this recess, are provided.
The caster guide member 10G is configured with a recess formed so that the fixed wheel caster 172 (17) can be housed therein, for example.
The configuration of the caster receiving sections 10U and 10V is not limited to the above, and can be set arbitrarily.

The support pillar receiving bracket 18 is formed, for example, by bending a rectangular metal plate in the thickness direction, and is arranged to protrude outward in the width direction of the loading platform 10.
The support bracket 18 supports from below the free end 20F of the tilted support member 20. The support bracket 18 sets the height positions of the upper side surface 20A and the lower side surface 20B of the tilted support member 20.

The support pole holding portion 12 is formed, for example, from a square piece of aluminum alloy material (square pipe) having an insertion hole 12H on the inside.
The insertion holes 12H are attached to the front and rear side surfaces F and R of the loading platform 10 so that the insertion holes 12H face in the vertical direction.
In addition, a recess 12C is formed in the support pillar holding portion 12 facing inward (towards the center) in the fore-and-aft direction of the loading platform 10, and the recess 12C is configured so that the lower side surface 20B of the tilted support pillar member 20 abuts against it.

In addition, in the support column holding portion 12, for example, a support column member support bolt (support column member, not shown) is arranged across the insertion hole 12H in the width direction of the transport cart 100 (load receiving platform 10).
In addition, at the bottom of the square timber (square pipe) that makes up the support pillar holding portion 12, a support pillar member support bolt 13 is arranged on the wall portion that faces the transport cart 100 (load receiving platform 10) in the width direction.

As shown in FIGS. 1 to 5, the support member 20 is made of, for example, a square piece of aluminum alloy material (square pipe).
The support member 20 is configured such that, for example, two rectangular pieces (square pipes) arranged in the longitudinal direction are relatively movable in the longitudinal direction along an axial member (not shown) arranged inside.
As a result, the support member 20 is extendable along the longitudinal direction, and can be extended and contracted in the vertical direction while standing, thereby changing the height.

Furthermore, as shown in Figures 2 and 3, the square timber (square pipe) that constitutes the support member 20 has elongated holes 22 formed along the longitudinal direction of the support member 20, for example, in the wall portions that face each other on the side (width direction) of the transport cart 100 (load receiving platform 10).

As shown in Figures 3 and 5, a support bolt (support member) 13 is inserted into the elongated hole 22 of the support member 20 so as to straddle the opposing wall portions, and the support member 20 moves up and down along the insertion hole 12H as the support bolt 13 guides the elongated hole 22 between the lower and upper ends.

When the lower end of the long hole 22 abuts against the support member locking pin 13, the support member 20 is pivotally supported by the support member locking pin 13 and can tilt (rotate) with the support member pivot bolt 13 as the fulcrum.
Furthermore, when the support member locking pin 13 abuts against the upper end of the elongated hole 22 , the support member 20 can be inserted into the insertion hole 12</b>H and attached to the support member holding portion 12 .

Furthermore, once the support member 20 has been attached to the support holder 12 and is erected against the loading platform 10, the lower end of the elongated hole 22 overlaps with the support locking hole 14.

Furthermore, when an insert pin (not shown) is inserted with the lower end of the elongated hole 22 aligned with the support locking hole 14, the support member 20 is locked with the support holding portion 12, preventing the support member 20 from slipping out upward.

As shown in FIGS. 1 to 5, the corner guard members 30 are disposed at the four corners of the outer contour portion C.
In this embodiment, the outer contour portion C is formed by the outer contours of the loading platform 10 and the support pole holder 12. In other words, it is formed by the rectangle formed by the loading platform 10 and the outer contours of four approximately square timbers (square pipes) that form the support pole holder 12 attached to the side of the loading platform 10 on the front side R and the rear side R.

The corner guard members 30 are formed to protrude from the end faces of the front side F and rear side R of the loading platform 10. The corner guard members 30 protrude laterally beyond the side faces of the loading platform 10 and the support pillar holder 12, and extend inward in the width direction of the loading platform 10.
The amount of protrusion from the end faces of the front side F and rear side R of the loading platform 10 and from the side surfaces of the loading platform 10 can be set arbitrarily, but it is preferable that each be, for example, 30 mm or more.
In this embodiment, the upper surface of the corner guard member 30 is formed flush with, for example, the load receiving surface 10A of the load receiving platform 10.

Next, the corner guard member 30 will be described in detail with reference to FIGS.
Figures 6 to 9 are perspective views for explaining the details of the corner guide member, with Figure 6 being a perspective view, Figure 7 being a plan view, Figure 8 being a front view, and Figure 9 being a side view. The dashed-double-dashed lines indicate partially enlarged views.

The corner guard member 30 can be made of any material, but it is preferable to use a flexible and elastic resin material. In this embodiment, the corner guard member 30 is made of, for example, a vinyl chloride elastomer.

As shown in Figure 6, the corner guard member 30 has a bottom wall portion 31 on the side where the outer contour portion C defined by the outer contours of the cargo receiving platform 10 and the support pillar holding portion 12 is located, in other words, facing the cargo receiving platform 10 and the support pillar holding portion 12, a rising wall portion 32, a recess 35 surrounded by the rising wall portion 32 and recessed from the outside to the inside, and an engagement portion 38.
In addition, when viewed in a plane, the corner guard member 30 is formed in an approximately L-shape with the corner portion located on the outside (opposite the right angle at the L-shaped bend) being R-shaped (1/4 arc).

As shown in FIGS. 6 and 7, the bottom wall portion 31 is positioned on the side of the loading platform 10 and the support column holder 12.
In addition, when viewed in a plane, the bottom wall portion 31 has a cross section that is bent and folded in an approximately L shape along the outer surface of the square pipe that constitutes the pillar holding portion 12, and this cross section is formed in the shape of a bent flat plate that extends in the vertical direction.

As shown in Figure 6, the rising wall portion 32 includes horizontal rising wall portions 33 and vertical rising wall portions 34. Specifically, it includes three horizontal rising wall portions 33 and six vertical rising wall portions 34.

As shown in Figures 6 and 7, the lateral rising wall portion 33 is connected to the bottom wall portion 31 in the lateral direction (horizontal direction), rises outward from the bottom wall portion 31, and is formed in a shape that is approximately the same as an L-shape when the corner guard member 30 is viewed in a plan view.
In this embodiment, the lateral rising wall portions 33 are formed, for example, at the upper end, the lower end, and the center (or near the center) in the height direction of the bottom wall portion 31 .

The vertically rising wall portion 34 is connected to the bottom wall portion 31 in the vertical direction (up and down direction), and intersects with the horizontally rising wall portion 33 at the center (or near the center) of the bottom wall portion 31 in the height direction.
The vertically rising wall portion 34 is formed to rise outward from the bottom wall portion 31 .
In this embodiment, as shown in Figures 6, 8, and 9, the vertically raised wall portions 34 are formed, for example, in two rows on the side surfaces of the bottom wall portion 31 of the transport cart 100, three rows on the front and rear surfaces, and one row on the corners.
Ten recesses 35 are formed in the area surrounded by the rising wall portion 31, specifically, in the area surrounded by the horizontal rising wall portion 33 and the vertical rising wall portion 34.

The engagement portion 38 is formed on the rear surface of the bottom wall portion 31 (the surface on the support holding portion 12 side).
In this embodiment, the engaging portion 38 includes, for example, a first engaging portion 38A and a second engaging portion 38B.

The first engagement portion 38A is formed, for example, on a surface corresponding to the front side F and rear side R of the transport cart 100.
In this embodiment, the first engaging portion 38A is formed in a generally L-shape in plan view and extends in the vertical direction.
The first engaging portion 38A is inserted vertically into the L-shaped grooves (engaged portions) 12T located on the front side F and rear side R of the support pole holding portion 12.

The second engagement portion 38B is formed on a surface that corresponds to the side surface of the transport cart 100, for example.
In this embodiment, the second engaging portion 38B is formed in a generally L-shape in plan view and extends in the vertical direction.
The second engaging portion 38B is inserted vertically into an L-shaped groove (engaged portion) 12S located on the side surface of the support pole holding portion 12.

The corner guard member 30 is then attached to the support post holding portion 12 by inserting the first engaging portion 38A and the second engaging portion 38B into the L-shaped grooves (engaged portions) 12T, 12S formed in the support post holding portion 12, installing a bolt (not shown) through the mounting hole 39, and installing the support post member support bolt 13.

Next, an example of a swing mechanism will be described with reference to FIGS.
Fig. 10 is a conceptual diagram seen from the front explaining the schematic configuration of the swing mechanism constituting the liftable wheel support part of the fixed-wheel caster of the transport cart according to the first embodiment, and Fig. 11 is a side view. In Fig. 10, the solid line indicates the state in which the wheel part is raised, and the two-dot chain line indicates the state in which the wheel part is lowered.

In Figures 10 and 11, reference numeral 17C denotes a liftable wheel support portion of the fixed-wheel caster, reference numeral 110 denotes a toggle mechanism, reference numeral 111 denotes an attachment bracket, reference numeral 112 denotes a first link member, reference numeral 113 denotes a second link member, reference numeral 114 denotes a universal joint portion, and reference numeral 115 denotes an arm member.
Also, reference numeral 121 denotes a first rotation shaft, reference numeral 122 denotes a second rotation shaft, reference numeral 123 denotes a third rotation shaft, reference numeral 124 denotes a fourth rotation shaft, and reference numeral 125 denotes an arm rotation shaft. Reference numeral 130 denotes a return spring.

In this embodiment, the liftable wheel support portion 17C is configured by a swing mechanism (caster lifting mechanism).
It is possible to arbitrarily set whether or not the liftable wheel support section 17C is configured with a swing mechanism, but it is preferable in that it can be raised and lowered directly from the side of the transport cart 100, for example.

As shown in Figures 10 and 11, the liftable wheel support unit 17C includes, for example, a mounting bracket 111, a toggle mechanism 110, a universal joint unit 114, a fourth pivot shaft 124, an arm member 115, an arm pivot shaft 125, and a restoring spring 130.

As shown in Figure 11, the mounting bracket 111 includes, for example, a first bracket connecting portion 111A (111) that is connected to the first link member 112, a second bracket connecting portion 111B (111) that is connected to the arm member 115, and a loading platform fixing portion 111C (111) that is fixed to the underside 10B of the loading platform 10.
The liftable wheel support portion 17C is attached to the loading platform 10 via a mounting bracket 111.

The arm member 115 is made up of a bracket, supports the wheel portion 17A via an axle 17D at one end, and has an arm rotation shaft 125 arranged parallel to the axle 17D at the other end.
The arm member 115 is connected to the stay 111 E of the mounting bracket 111 by an arm rotation shaft 125 and is rotatable around the arm rotation shaft 125 .

As shown in Figures 10 and 11, the toggle mechanism 110 includes, for example, a first link member 112, a third link member 113, a first rotating shaft 121, a second rotating shaft 122, and a third rotating shaft 123.
The first rotating shaft 121, the second rotating shaft 122, and the third rotating shaft 123 are arranged parallel to one another and along a direction perpendicular to the axle 17D.

The first link member 112 and the second link member 113 are formed, for example, in a U-shape (channel shape). The second link member 113 is disposed inside the first link member 112.
The first link member 112 and the third link member 113 are connected via a second rotation shaft 122 .
The first link member 112 and the third link member 113 are rotatable relative to each other around a second rotation shaft 122 .

The upper portion of the first link member 112 is rotatably connected to the mounting bracket 111 via a first rotation shaft 121 .
The second link member 113 has a lower portion rotatably connected to the universal joint portion 114 via a third rotation shaft 123 .

In addition, the first link member 112 is formed with an operation pedal 112C that extends outward in the width direction of the loading platform 10.
When the operation pedal 212C is depressed, the first link member 112 and the third link member 113 rotate relative to each other around the second rotation shaft 122 and are arranged bent or linearly.
As a result, the crossing angle θ formed between the first link member 112 and the third link member 113 at the second rotation shaft 122 changes.

When the first link member 112 and the third link member 113 are arranged linearly and the first rotating shaft 121, the second rotating shaft 122, and the third rotating shaft 123 are arranged in a straight line, the dead center of the toggle mechanism 110 is formed.
Furthermore, when the toggle mechanism 110 forms the dead point, the pressing portion 112S comes into contact with and presses the lower surface 111S of the mounting bracket 111, thereby holding the toggle mechanism 110 at the dead point.

On the other hand, when the operating pedal 212C is kicked from below (moved upward), the first link member 112 and the third link member 113 rotate and bend around the second rotating shaft 122, and the toggle mechanism 110 is released from its dead center. As a result, the wheel section 17A rises.

As shown in Figures 10 and 11, the universal joint portion 114 includes, for example, a pair of opposing wall portions 114B connected to the main wall portion 114A and extending upward from the main wall portion 114A, a pair of wall portions 114C arranged perpendicular to the pair of opposing wall portions 114B when viewed along the thickness direction of the main wall portion 114A, connected to the main wall portion 114A, and extending downward from the main wall portion 114A (in the opposite direction to the pair of opposing wall portions 114B) and facing each other, rubber (elastic member) 114E arranged between the pair of opposing wall portions 114C and layered in sequence from the main wall portion 114A, and a metal plate 114F.
A third rotation shaft 123 is inserted through the pair of opposing wall portions 114B, and a fourth rotation shaft 124 is inserted through the pair of opposing wall portions 114C.

In other words, the universal joint portion 114 connects the third rotating shaft 123 and the fourth rotating shaft 124 in directions perpendicular to each other, allowing the third rotating shaft 123 and the fourth rotating shaft 124 to rotate around each other, thereby forming a universal joint.

The universal joint portion 114 has a third link member 113 disposed inside the pair of opposing wall portions 114B, and is rotatably connected to the second link member 113 via a third rotation shaft 123.
Furthermore, the universal joint portion 114 has an arm member 115 disposed on the outside of the universal joint portion 114C, and is rotatably connected to the arm member 115 via a fourth rotation shaft 124.

In addition, rubber (elastic member) 114E and metal plate 114F are laminated in this order from the main wall portion 114A. Even if a heavy object is loaded onto the loading platform 10 and the loading platform 10 flexes, the dimensional changes caused by the flexure are absorbed, allowing the wheel portion 17A to be easily raised and lowered.

When the position of the fourth pivot shaft 124 changes, the arm member 115 rotates around the arm pivot shaft 125, causing the arm member 115 to swing.

The arm rotation shaft 125 is located on the opposite side of the fourth rotation shaft 124 from the axle 17D.
The arm rotation shaft 125 is located above the axle 17D and below the fourth rotation shaft 124.

The restoring spring 130 is made of, for example, a tension coil spring, and connects one end of the arm member 115 to the mounting bracket 111 .
Then, one end of the arm member 115 is pulled upward.
As a result, when the dead point of the toggle mechanism 110 is released, the arm member 115 is rotated around the arm rotation shaft 125, and the wheel portion 17A is raised.

Next, the operation of the caster receiving portion will be described with reference to FIG.
FIG. 12 is a perspective view illustrating an outline of a state in which the transporting carts are stacked one on top of another.

As shown in Figure 12, by tilting and tilting the support member 20 of the transport cart 100, the free-wheel caster 171 and fixed-wheel caster 172 of another transport cart 100 can be stored in the caster storage section 10U and caster storage section 10V of the transport cart 100 located below.
As a result, a plurality of transport carts 100 can be stored in a stacked manner.

At this time, the fixed casters 172 of the transport cart 100 are accommodated within a predetermined range in the front-to-rear and width directions by the guide recesses 10D of the caster storage section 10V, allowing the transport cart 100 to be stably loaded.

At this time, because the caster storage section 10U is formed larger than the free-wheel caster 171, the free-wheel caster 171 is prevented from getting caught on the loading platform 10, etc., and the fixed-wheel caster 172 can be easily and efficiently stored in the caster storage section 10V.

According to the transport cart 100 of the first embodiment, the corner guard member 30 is arranged at the corner of the outer contour portion defined by the loading platform 10 and the support pillar holding portion 12, so that when the transport cart 100 collides with a wall, pillar, etc., or another transport cart, the impact of the collision on the transport cart can be mitigated.
Furthermore, in the event of a collision of the transporting cart 100, the hands gripping the support members 20 are prevented from being pinched. As a result, safety during transporting operations can be improved.

In addition, with the transport cart 100, corner guard members 30 are positioned at the four corners of the outer contour, which reduces the risk of hands getting caught when the transport cart 100 collides with any part of the cart, improving safety during transport work.

Furthermore, according to the transport cart 100, the corner guard member 30 is formed with multiple recesses 35 that are recessed from the surface positioned on the outside in a plan view toward the outer contour portion, thereby efficiently mitigating the impact when the transport cart 100 collides.

Furthermore, with the transport cart 100, the upper surface of the corner guard member 30 is formed flush with the upper surface 10A of the cargo receiving platform 10, so the corner guard member 30 does not get in the way when loading cargo onto the cargo receiving platform 10, and even when cargo is loaded on top of the corner guard member 30, the cargo can be stably supported.

Furthermore, according to the transport cart 100, the corner guard member 30 is provided with an engaging portion 38, which engages with the L-shaped grooves (engaged portions) 12T, 12S formed in the support pillar holding portion 12 to hold it to the outer contour portion C, thereby preventing the corner guard member 30 from peeling off (coming off) from the outer contour portion (load receiving platform, support pillar member) C.
As a result, safety during transportation work can be stably improved.

Furthermore, with the transport cart 100, the support members 20 are pivotally supported by support member pivot bolts 13 arranged on the load receiving platform 20 and are configured to be able to stand upright or tilt relative to the load receiving platform 10. Therefore, by tilting the support members 20, the space occupied by the transport cart 100 (for example, the space required for storage) can be reduced.

Furthermore, according to the transport cart 100, of the three pairs of casters 17 arranged along the front-to-rear direction of the cargo receiving platform 10, the fixed-wheel caster 172, which is located in the center in the front-to-rear direction, is configured so that the wheel section 17A can be raised and lowered relative to the floor surface. Therefore, this caster 172 can be raised as needed for the transport work, improving workability and safety during the transport work.

In the transport cart 100 according to the first embodiment, the fixed-wheel caster 172 is equipped with a liftable wheel support portion 17C, allowing the wheel portion 17A to be raised and lowered. Therefore, by lifting the wheel portion 17A off the floor, the transport cart 100 can be moved laterally (widthwise) easily and efficiently.

In addition, according to the transport cart 100, the fixed-wheel caster 172 is equipped with an operating pedal 112C, which allows the wheel portion 17A to be lowered or raised. As a result, transport work can be carried out efficiently.

In addition, the transport cart 100 is equipped with a support support bracket 18, which supports the free end 20F of the tilted support member 20, allowing the upper side surface 20A and lower side surface 20B of the support member 20 to be positioned at a predetermined height.

Furthermore, with the transport cart 100, when the support member 20 is tilted and laid down, the upper side surface 20A of the support member 20 is positioned below the load receiving surface 10A of the load receiving platform 10, thereby preventing damage to the support member 20 due to the weight of the cargo loaded on the load receiving platform 10.

Furthermore, with the transport cart 100, the lower surface 20B of the support member 20 is positioned higher than the lower surface 10B of the loading platform 10. Therefore, even if, for example, the forks of a forklift are inserted under the loading platform 10, the support member 20 is prevented from coming into contact with the forks and being damaged.

Second Embodiment
A transport cart according to a second embodiment of the present invention will now be described with reference to FIG.
FIG. 13 is a front view illustrating the schematic configuration of a transport cart according to the second embodiment.
In FIG. 13, reference numeral 200 denotes a transport cart.

As shown in FIG. 13, the transport cart 200 includes, for example, a loading platform 10, a support pole holder 12, casters 17, support pole members 20, and corner guard members 30.
The support member 20 can be set upright relative to the loading platform 10 or tilted down.

The transport cart 200 differs from the first embodiment in that, while the transport cart 100 is equipped with three pairs of casters 17 in the front-to-rear direction, the transport cart 200 is equipped with two pairs of free-wheel casters 171 (17) located on the front side F and rear side R of the load receiving platform 10. As the rest of the components are the same as those in the first embodiment, the same reference numerals are used and their explanations are omitted.

Third Embodiment
Hereinafter, a transport cart according to a third embodiment of the present invention will be described with reference to FIG.
FIG. 14 is a front view illustrating the schematic configuration of a transport cart according to the third embodiment.
In FIG. 14, reference numeral 300 denotes a transport cart, reference numeral 20 denotes a support member, reference numeral 20A denotes the upper side of the support member in a laid-down state, and reference numeral 20B denotes the lower side of the support member in a laid-down state.

As shown in FIG. 14, the transport cart 300 includes, for example, a loading platform 10, a support pole holder 12, casters 17, support pole members 20, and corner guard members 30.
The support member 20 can be erected or tilted relative to the loading platform 10.

The transport cart 300 is configured so that, for example, when the support member 20 pivotally supported by the support holding portion 12 is tilted and laid down, the side surface 20A located on the upper side of the support member 20 is positioned flush with the load receiving surface (upper surface of the load receiving platform) 10A, and the side surface 20B located on the lower side of the support member 20 is positioned at a higher position than the lower surface 10B of the load receiving platform.
Other than that, the second embodiment is similar to the first embodiment, so the same reference numerals are used and the description will be omitted.

Fourth Embodiment
A fourth embodiment of the present invention will now be described with reference to FIG.
FIG. 15 is a plan view illustrating a schematic configuration of a transport cart according to the fourth embodiment.
In Figure 15, reference numeral 400 denotes a transport cart, reference numeral 410 denotes a loading platform, reference numeral 412 denotes a support column holder, reference numeral 413 denotes a support column member support bolt (support column shaft support member), reference numeral 420 denotes a support column member, and reference numeral 430 denotes a corner guard member.

As shown in Figure 15, the transport cart 400 includes, for example, a cargo receiving platform 410 having a rectangular outer shape in a plan view, a support pole holder 412, casters (not shown), support pole members 420, and corner guard members 430.

As shown in Figure 15, the pillar holding portion 412 is, for example, a cylindrical member that is rectangular in plan view, and two are arranged on each side of the front side F and rear side R of the loading platform 410 in the width direction (near the center), with their hollow portions aligned in the vertical direction.
The support pillar holders 412 are disposed in recesses recessed inward from the end faces of the front side F and rear side R of the loading platform 410. Specifically, the support pillar holders 412 are flush with the end faces of the loading platform 410 on the front side F and rear side R.
In addition, the support pillar holder 412 has a support pillar member support bolt (support pillar shaft support member) 413 arranged to pass through opposing wall portions in the width direction of the loading platform 410.

The support member 420 is formed, for example, from a square pipe, and at the bottom of the support member 420, a long hole (not shown) is formed along the longitudinal direction in the wall portion facing the width direction of the loading platform 410.
The support column member 420 is supported by the support column member support bolt 413 by inserting the support column member support bolt 413 into this elongated hole, and is movable relative to the support column member support bolt 413 in the longitudinal direction.

As a result, the support member 420 can be inserted into the support member holding portion 412 while standing upright relative to the receiving platform 410, and by removing it from the support member holding portion 412, it can be rotated around the support member support bolt 413 and tilted relative to the receiving platform 410.
In addition, a groove (not shown) is formed on the upper surface of the loading platform 410 along the longitudinal direction.
The tilted support member 420 is stored in this groove (not shown) so that the support member 420 does not protrude from the upper surface of the loading platform 410.

As shown in FIG. 15, the corner guard members 430 are arranged at the four corners of the outer contour portion C of the transport cart 400.
In the fourth embodiment, the outer contour portion C of the transport cart 400 in plan view is defined by the outer contour of the load receiving platform 410 and the outer contour of the support column holder 412. Specifically, the corners of the outer contour portion C of the transport cart 400 are the four corners of the load receiving platform 410.

15, the corner guard members 430 are formed to protrude from the end faces of the front side F and rear side R of the load receiving platform 410, and also to protrude laterally from the side faces of the load receiving platform 410. The amount of protrusion from the end faces of the front side F and rear side R of the load receiving platform 410 and from the side faces of the load receiving platform 410 can be set arbitrarily, but it is preferable that each be, for example, 30 mm or more.
The rest is the same as in the first embodiment, so the explanation will be omitted.

Fifth Embodiment
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 16 is a plan view illustrating a schematic configuration of a transport cart according to the fifth embodiment.
In Figure 16, reference numeral 500 denotes a transport cart, reference numeral 510 denotes a loading platform, reference numeral 512 denotes a support column holder, reference numeral 513 denotes a support column member support bolt (support column shaft support member), reference numeral 520 denotes a support column member, and reference numeral 530 denotes a corner guard member.

As shown in Figure 16, the transport cart 500 includes, for example, a cargo receiving platform 510 having a rectangular outer shape in a plan view, a support pole holder 512, casters (not shown), support pole members 520, and corner guard members 530.

As shown in Figure 16, the pillar holding portion 512 is, for example, a cylindrical member that is rectangular in plan view, and two are arranged on each side of the front side F and rear side R of the loading platform 510 in the width direction (near the center), with their hollow portions aligned in the vertical direction.
The support pillar holders 512 are attached to the end faces of the front side F and rear side R of the loading platform 510 and are positioned to protrude from the loading platform 510 toward the front side F and rear side R.
In addition, the support pillar holder 512 has a support pillar member support bolt (support pillar shaft support member) 513 arranged to pass through opposing wall portions in the width direction of the loading platform 510.

The support member 520 is formed, for example, from a square pipe, and at the bottom of the support member 520, a long hole (not shown) is formed along the longitudinal direction in the wall portion facing the width direction of the loading platform 510.
The support column member 520 is supported by the support column member support bolt 513 by inserting the support column member support bolt 513 into this elongated hole, and is movable relative to the support column member support bolt 513 in the longitudinal direction.

As a result, the support member 520 can be inserted into the support member holding portion 512 while standing upright relative to the loading platform 510, and by removing it from the support member holding portion 512, it can be rotated around the support member support bolt 513 and tilted relative to the loading platform 510.
In addition, a groove (not shown) is formed on the upper surface of the loading platform 510 along the longitudinal direction.
The tilted support member 520 is stored in this groove (not shown) so that the support member 520 does not protrude from the upper surface of the loading platform 510.

As shown in FIG. 16, the corner guard members 530 are arranged at the four corners of the outer contour portion C: of the transport cart 500.
In the fifth embodiment, the outer contour portion C of the transport cart 500 in a plan view is defined by the outer contour of the load receiving platform 510 and the outer contour of the support column holder 512 that protrudes from the load receiving platform 510 to the front side F and the rear side R. Specifically, the corners of the outer contour portion C of the transport cart 500 are the four corners of the load receiving platform 510.

16, the corner guard members 530 are formed to protrude from the end faces of the front side F and rear side R of the cargo receiving platform 510. The corner guard members 530 protrude laterally from the side surfaces of the cargo receiving platform 510 and extend outward (to the vicinity of) the support pillar holders 512 in the width direction of the cargo receiving platform 510.
The amount of protrusion from the end faces of the front side F and rear side R of the loading platform 510 and from the side surfaces of the loading platform 510 can be set arbitrarily, but it is preferable that each be, for example, 30 mm or more.

As shown in FIG. 16, the corner guard member 530 preferably projects forward F and backward R beyond the support pole holding portion 512, for example.
The rest of the configuration is the same as the first and fourth embodiments, so a description thereof will be omitted.

Sixth Embodiment
A sixth embodiment of the present invention will be described below with reference to FIG.
FIG. 17 is a plan view illustrating a schematic configuration of a transport cart according to the sixth embodiment.
In FIG. 17, reference numeral 600 denotes a transport cart, and reference numeral 630 denotes a corner guard member.

As shown in FIG. 17, the transport cart 600 includes a load receiving platform 510, a support pole holder 512, casters (not shown), support pole members 520, and corner guard members 630.
The loading platform 510, the support pole holder 512, and the support pole member 520 are the same as those in the fifth embodiment, and therefore the same reference numerals are used and the description thereof will be omitted.

As shown in FIG. 17, the corner guard members 630 are arranged at the four corners of the outer contour portion C of the transport cart 600.
In the sixth embodiment, the outer contour C of the transport cart 600 in plan view is defined by the outer contour of the load receiving platform 510 and the outer contour of the support column holder 512 protruding from the load receiving platform 510 to the front side F and rear side R. Specifically, the corners of the outer contour C of the transport cart 600 are the four corners of the load receiving platform 510.

As shown in Figure 17, the corner guard members 630 are formed to protrude, for example, from the end faces of the front side F and rear side R of the loading platform 510, and also protrude laterally from the side faces of the loading platform 510. The amount of protrusion from the end faces of the front side F and rear side R of the loading platform 510 and from the side faces of the loading platform 510 can be set as desired, but it is preferable that each be, for example, 30 mm or more.

As shown in FIG. 17, the corner guard member 630 has a recess 630U formed therein to accommodate the support post holding portion 512, and is formed to protrude forward F and rearward R beyond the support post holding portion 512.
Other than that, the second embodiment is similar to the first and fifth embodiments, and therefore a description thereof will be omitted.

In the transport cart 600 according to the sixth embodiment, a recess 630U is formed in the corner guard member 630, and the support holding portion 612 is housed in the corner guard member 630, preventing the hand holding the support member 520 from being pinched by a wall or the like. Furthermore, if the transport cart 600 collides with a wall, another cart, or the like, the force of the collision is mitigated, preventing damage to the wall, other cart, or the like.

Seventh Embodiment
Hereinafter, a seventh embodiment of the present invention will be described with reference to FIG.
FIG. 18 is a plan view illustrating a schematic configuration of a transport cart according to the seventh embodiment.
In FIG. 18, reference numeral 700 denotes a transport cart, and reference numeral 730 denotes a corner guard member.

As shown in FIG. 18, the transport cart 700 includes, for example, a load receiving platform 510, a support pole holder 512, casters (not shown), support pole members 520, and corner guard members 730.
The loading platform 510, the support pole holder 512, and the support pole member 520 are the same as those in the fifth embodiment, and therefore the same reference numerals are used and the description thereof will be omitted.

As shown in FIG. 18, the corner guard members 730 are arranged at the four corners of the outer contour portion C of the transport cart 700.
In the sixth embodiment, the outer contour portion C of the transport cart 700 in a plan view is defined by the outer contour of the load receiving platform 510 and the outer contour of the support column holder 512 that protrudes from the load receiving platform 510 to the front side F and the rear side R. Specifically, the corners of the outer contour portion C of the transport cart 700 are the four corners of the load receiving platform 510.

As shown in Figure 18, the corner guard members 730 are formed to protrude, for example, from the end faces of the front side F and rear side R of the loading platform 510, and also protrude laterally from the side faces of the loading platform 510. The amount of protrusion from the end faces of the front side F and rear side R of the loading platform 510 and from the side faces of the loading platform 510 can be set as desired, but it is preferable that each be, for example, 30 mm or more.

As shown in FIG. 18, if safety can be ensured, the amount of protrusion of the corner guard member 730 to the front side F and rear side R may be smaller than the amount of protrusion of the support pole holding portion 512.
Other than that, the second embodiment is similar to the first and fifth embodiments, and therefore a description thereof will be omitted.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, in the above embodiment, the corner guard members 30, 430, 530, 630, 730 are disposed at the four corners of the outer contour C of the transport cart 100, 200, 300, 400, 500, 600, 700, but the positions and number of the corner guard members can be set arbitrarily. For example, they may be disposed at either a corner on the front side F or the rear side R of the loading platform 10, 410, 510, or at either a corner on the left or right side. They may also be disposed in one location.

In addition, in the above embodiment, the corner guard members are described as being made of a flexible and pliable PVC elastomer, but the material from which the corner guard members are made can be selected as desired. For example, they may be made of a resin material other than a PVC elastomer, or they may be made of a material that is not flexible or pliable.

In addition, in the above embodiment, the corner guard members 30, 430, 530, and 730 are generally L-shaped in plan view, with the corners formed with an arc-like R-shape. However, the shape and configuration of the corner guard members can be set as desired. For example, the front and rear surfaces and the side surfaces may be formed from two or more separate pieces, or one of the corners may be formed with a shape other than an arc or R-shape.

In addition, in the above embodiment, the corner guard member 30 is described as having ten recesses 35 recessed from the outside to the inside, but whether or not recesses are formed in the corner guard member, and if recesses are formed, the shape, position, and number of recesses can be set arbitrarily.
For example, the shape of the recess when viewed from the opening side may be set arbitrarily, such as a honeycomb shape (hexagonal), a circle, or a semicircle.

In addition, in the above embodiment, the corner guard member 30 is described as having engaging portions 38A, 38B (38), but it is possible to arbitrarily determine whether or not to form engaging portions 38A, 38B (38) on the corner guard member 30. For example, the corner guard member 30 may be configured without engaging portion 38, or may be configured with only one of engaging portions 38A, 38B.

In addition, in the above embodiment, the engaging portions 38 of the corner guard member 30 are engaging portions 38A, 38B that are L-shaped in plan view and engage with the L-shaped grooves (engaged portions) 12T, 12S formed in the support pole holding portion 12. However, the configuration of the engaging portions 38 can be set arbitrarily, and for example, they may be formed into other shapes, such as T-shaped protrusions, that allow the corner guard member 30 to be accurately attached.

In addition, in the above embodiment, the corner guard member 30 is described as being positioned flush with the upper surface 10A of the cargo receiving platform 10, but the height positions of the upper and lower surfaces of the corner guard member 30 can be set as desired. For example, the corner guard member 30 may be set higher than the upper surface 10A of the cargo receiving platform 10, or the corner guard member 30 may be positioned between the upper surface 10A and the lower surface 10B of the cargo receiving platform 10. Furthermore, the lower surface of the corner guard member 30 may be positioned flush with the lower surface 10B of the cargo receiving platform 10, or may be positioned lower than the lower surface of the cargo receiving platform 10.

In addition, in the above embodiment, the transport carts 100, 200, 300, 400, 500, 600, and 700 are described as being equipped with tiltable support members 20, 420, and 520. However, corner guard members may also be used on transport carts equipped with fixed support members or insertable support members, for example.

In addition, in the above embodiment, the fixed-wheel caster 172 is equipped with a liftable wheel support portion 17C, and the wheel portion 17A can be raised and lowered by the toggle mechanism 110. However, it is possible to arbitrarily set whether or not the fixed-wheel caster 172 is equipped with a lifting mechanism.

In addition, when raising and lowering the wheel section 17A, it is possible to arbitrarily set whether to use the liftable wheel support section 17C configured with a swing mechanism, and whether the liftable wheel support section 17C can raise and lower the wheel section 17A using the toggle mechanism 110. For example, the axle section 17A can be configured to be liftable and lowerable using a plunger, coil spring, etc.

In addition, in the above embodiment, a long hole 22 is formed along the longitudinal direction of the support member 20, and a support member pivot bolt (protrusion) 13 is arranged in the support holding portion 12. However, a configuration in which a long hole is formed along the vertical direction of the support holding portion 12, and a support member pivot pin (protrusion) or the like is arranged in the support member 20, may also be used.

In addition, in the above embodiment, the upper side surface 20A of the tilted support member 20 is positioned lower than the load receiving platform 10 or flush with the load receiving surface 10A, and the lower side surface 20B is positioned higher than the lower surface 10B of the load receiving platform 10. However, the positional relationship in the height direction between the upper side surface 20A of the support member 20 and the load receiving surface 10A of the load receiving platform 10, and between the lower side surface 20B of the support member 20 and the lower surface 10B of the load receiving platform 10, may be set arbitrarily. For example, the upper side surface 20A of the support member 20 may be positioned higher than the load receiving surface 10A of the load receiving platform 10, or the lower side surface 20B may be positioned lower than the lower surface 10B of the load receiving platform 10.

In addition, in the above embodiment, the transport cart 100 is described as being equipped with caster storage units 10U and 10V, but whether or not the caster storage units 10U and 10V are equipped, and if the caster storage units 10U and 10V are equipped, their shape, size, configuration, arrangement, etc. can be set arbitrarily.

The transport cart of the present invention can improve safety during transport operations and is therefore applicable industrially.

100, 200, 300, 400, 500, 600, 700 Transport cart 10, 410, 510 Load receiving platform 10A Load receiving surface (upper surface of loading platform)
10B Underside of receiving platform 10U, 10V Caster storage section 12, 412 Support column holding section 17 Caster 171 Free wheel caster 172 Fixed wheel caster 17A Wheel section (caster)
17B Wheel support part (caster)
17C Elevating wheel support unit (caster)
17D Axle 20, 420, 520 Support member 20A Upper surface of support portion (tilted state)
20B Lower surface of support part (tilted state)
20F: Free end of support member 22: Slots 30, 430, 530, 630, 730: Corner guard member 35: Recess (corner guard)
110 toggle mechanism 112 first link member 113 second link member 114 universal joint portion 115 arm member

Claims (6)

a cargo receiving platform formed in a rectangular shape in a plan view on which cargo is loaded;
A support member erected on the loading platform;
a plurality of casters each having a wheel portion that is arranged under the loading platform and is rotatable around an axle;
corner guard members that are disposed at corners of an outer contour portion defined by the loading platform and the support members when viewed from above and that protrude outward from the outer contour portion;
Equipped with
The corner guard member is
a plurality of recesses are formed that are recessed from a surface positioned on the outside in a plan view toward the outer contour portion, and are arranged side by side along the outer contour portion in a plan view and are arranged side by side in the vertical direction;
The corner guard member is
The upper surface is formed flush with the loading platform.
A transport cart characterized by: a cargo receiving platform formed in a rectangular shape in a plan view on which cargo is loaded;
A support member erected on the loading platform;
a plurality of casters each having a wheel portion that is arranged under the loading platform and is rotatable around an axle;
corner guard members that are disposed at corners of an outer contour portion defined by the loading platform and the support members when viewed from above and that protrude outward from the outer contour portion;
Equipped with
The corner guard member is
a plurality of recesses are formed that are recessed from a surface positioned on the outside in a plan view toward the outer contour portion, and are arranged side by side along the outer contour portion in a plan view and are arranged side by side in the vertical direction;
The corner guard member has an engaging portion,
The engaging portion is configured to be engaged with an engaged portion formed on the outer contour portion so as to be held by the outer contour portion.
A transport cart characterized by: a cargo receiving platform formed in a rectangular shape in a plan view on which cargo is loaded;
A support member erected on the loading platform;
a plurality of casters each having a wheel portion that is arranged under the loading platform and is rotatable around an axle;
corner guard members that are disposed at corners of an outer contour portion defined by the loading platform and the support members when viewed from above and that protrude outward from the outer contour portion;
Equipped with
The corner guard member is
a plurality of recesses are formed that are recessed from a surface positioned on the outside in a plan view toward the outer contour portion, and are arranged side by side along the outer contour portion in a plan view and are arranged side by side in the vertical direction;
The support member is
The load receiving platform is rotatably supported by a support shaft and is configured to be able to stand or tilt relative to the load receiving platform.
A transport cart characterized by: a cargo receiving platform formed in a rectangular shape in a plan view on which cargo is loaded;
A support member erected on the loading platform;
a plurality of casters each having a wheel portion that is arranged under the loading platform and is rotatable around an axle;
corner guard members that are disposed at corners of an outer contour portion defined by the loading platform and the support members when viewed from above and that protrude outward from the outer contour portion;
Equipped with
The corner guard member is
a plurality of recesses are formed that are recessed from a surface positioned on the outside in a plan view toward the outer contour portion, and are arranged side by side along the outer contour portion in a plan view and are arranged side by side in the vertical direction;
The support member is
The support rod is configured to be insertable into a support rod holder formed on the loading platform.
A transport cart characterized by: The transport cart according to any one of claims 1 to 4 ,
The transport cart, wherein the corner guard members are arranged at four corners of the outer contour portion. The transport cart according to any one of claims 1 to 5 ,
Three pairs of casters are provided along the front-rear direction of the loading platform,
The transport cart is characterized in that the caster disposed in the center in the front-to-rear direction among the three pairs of casters is configured so that the wheel portion can be raised and lowered relative to a floor surface.