JP2024002383A - Dolly extension device - Google Patents

Abstract

To prevent a lining-up state of tires from being unstable when tires are placed on a dolly to be displayed or transported.SOLUTION: A dolly extension device 1 includes: an extension board 2 connected to a base 71 of a dolly 7; a caster 3 attached to the extension board 2; a caster fixing member to which the caster 3 is fixed; and a distance adjustment member 5 which hangs the caster fixing member on the extension board 2 and adjusts a distance between the extension board 2 and the caster 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a truck expansion device that is retrofitted to a truck to expand its size.

At car parts stores, service stations, tire specialty stores, etc., two groups of tires (multiple tires stacked along a vertical axis) are sometimes displayed or transported adjacent to each other on a trolley.

If the outer diameter of the tires placed on the trolley is large, a portion of one of the two tire groups will protrude significantly from the platform of the trolley, resulting in uneven alignment of the tires that make up that one tire group. There is a risk of stability.

For example, during a tire exhibition, wind or the like may act on one of two tire groups, causing the tire to shake, tilt, or fall.

Further, during tire transportation, vibrations of the truck due to unevenness of the floor surface may be transmitted to one of the two tire groups, causing the tire to tilt, collapse, or fall.

This invention was made in view of these circumstances, and its object is to prevent the alignment of the tires from becoming unstable when the tires are placed on a trolley and displayed or transported.

In order to solve the above-mentioned problem, the invention according to claim 1 provides an expansion board connected to a platform of a cart, a caster attached to the expansion board, a caster fixing member to which the caster is fixed, and a caster fixing member to which the caster is fixed. A trolley expansion device including a distance adjusting member that suspends a fixing member from the expansion board and adjusts a distance between the expansion board and the casters, wherein the caster fixing member is connected to the caster fixing member main body and the caster. a pair of first connecting members having a pair of caster fixing member side protrusions continuous to both ends of the fixing member main body, the distance adjusting member removably connecting the caster fixing member to the expansion board; The present invention is characterized in that it includes a pair of second connecting members that removably connect the pair of first connecting members to the expansion board.

The invention according to claim 2 is the trolley expansion device according to claim 1, in which the pair of first connecting members each include a first connecting member main body and a first connecting member main body connected to the first connecting member main body. a connecting member side protrusion, the expansion board has a pair of expansion board side first holes into which the first connecting member side protrusions are inserted, and the first connecting member body has a pair of expansion board side first holes into which the first connecting member side protrusions are inserted. , a first hole on the first connecting member side into which the caster fixing member side protrusion is inserted, and the second connecting member is connected to a second connecting member main body and a second connecting member main body. a continuous second connecting member side protrusion, and the first connecting member side protrusion has a first connecting member side second hole into which the second connecting member side protrusion is inserted. It is characterized by

The invention according to claim 3 is the trolley expansion device according to claim 2, wherein the distance adjusting member removably connects the pair of second connecting members to the pair of first connecting members. further comprising a pair of third connecting members, the third connecting member having a third connecting member main body and a third connecting member side protrusion continuous to the third connecting member main body, The second connecting member main body has a first hole on the second connecting member side into which the third connecting member side protrusion is inserted, and the expansion board has a first hole on the second connecting member side into which the third connecting member side protrusion is inserted. It is characterized by further having a pair of expansion board-side second holes into which the expansion board is inserted.

The invention according to claim 4 is the trolley expansion device according to claim 3, further comprising a deflection suppressing member disposed between the expansion board and the caster fixing member to suppress deflection of the caster fixing member. It is characterized by

The invention according to claim 5 is the trolley expansion device according to claim 4, in which the deflection suppressing member includes a deflection suppressing member main body and a cross-shaped deflection suppressing member side first portion connected to an upper end of the deflection suppressing member main body. and a second protrusion on the deflection suppressing member side that is continuous with the lower end of the deflection suppressing part main body, and the caster fixing member main body has a cross section into which the first protrusion on the deflection suppressing member side is inserted. The extension board has a caster fixing member side hole having a shape, and the extension board further has an extension board side third hole into which the deflection suppressing member side second protrusion is inserted.

According to a sixth aspect of the present invention, in the trolley expansion device according to the fifth aspect, the expansion board further includes a plurality of bolt holes.

According to a seventh aspect of the present invention, in the trolley expansion device according to the sixth aspect, the tip end of the expansion board has a convex arc shape.

According to an eighth aspect of the present invention, in the trolley expansion device according to the seventh aspect, the shape of the rear end portion of the expansion board is a concave arc shape.

The invention according to claim 9 is the trolley expansion device according to any one of claims 1 to 8, wherein the expansion board, the caster fixing member, and the distance adjustment member are each made of plastic cardboard. shall be.

This invention can prevent the alignment of tires from becoming unstable when the tires are displayed or transported on a trolley.

FIG. 1 is a perspective view showing a state in which a cart expansion device according to an embodiment of the present invention is connected to a cart. FIG. 2 is a view of the caster fixing member of the trolley extension device shown in FIG. 1 being connected to the extension board by a pair of first connection members, as seen from the back side of the extension board. FIG. 3 is a view from the front side of the expansion board, showing a state in which a pair of first connection members of the trolley expansion device shown in FIG. 1 are connected to the expansion board by a pair of second connection members. FIG. 4 is a view from the front side of the expansion board in which the pair of second connecting members of the trolley expansion device of FIG. 1 are connected to the pair of first connecting members by the pair of third connecting members. . FIG. 5 is a diagram for explaining the deflection suppressing member of the trolley expansion device of FIG. 1. FIG. FIG. 6 is a plan view of the caster fixing member of the trolley expansion device of FIG. 1. FIG. 7 is a plan view of the expansion board of the trolley expansion device of FIG. 1. FIG. 8 is a plan view of the first connecting member of the trolley expansion device of FIG. 1. 9 is a plan view of the second connecting member of the trolley expansion device of FIG. 1. FIG. FIG. 10 is a plan view of the third connecting member of the trolley expansion device of FIG. 1. FIG. 11 is a perspective view of casters of the trolley expansion device of FIG. 1. FIG. 12 is a plan view of the first connecting member of the trolley expansion device according to a modification of the present invention.

Embodiments of the present invention will be described below based on the drawings.
As shown in FIGS. 1 and 2, a trolley expansion device 1 according to an embodiment of the present invention includes an expansion board 2 connected to a base 71 of a trolley 7, casters 3 attached to the expansion board 2, and casters 3 mounted on the expansion board 2. A flat caster fixing member 4 to which the caster fixing member 3 is fixed; a distance adjusting member 5 which suspends the caster fixing member 4 from the expansion board 2 and adjusts the distance between the extension board 2 and the casters 3; A deflection suppressing member 6 is provided between the caster fixing member 4 and the caster fixing member 4 to suppress deflection of the caster fixing member 4.

The trolley 7 has a base 71, a plurality of casters 72, and a handle 73.
As shown in FIG. 6, the caster fixing member 4 includes a caster fixing member main body 41 and a pair of caster fixing member side protrusions 42 continuous to both ends of the caster fixing member main body 41.

As shown in FIG. 4, the distance adjusting member 5 includes a pair of first connecting members 51 that removably connect the caster fixing member 4 to the expansion board 2, and a pair of first connecting members 51 that connect the pair of first connecting members 51 to the expansion board 2, respectively. a pair of second connecting members 52 that are removably connected to the
It has a pair of third connecting members 53 that removably connect the pair of second connecting members 52 to the pair of first connecting members 51, respectively.

The caster fixing member 4 is connected in parallel to the expansion board 2 (see FIG. 2).
As shown in FIG. 8, each of the pair of first connecting members 51 includes a substantially rectangular first connecting member main body 511, and a long side portion of the first connecting member main body 511 (an expansion board contact portion 511a). ).

When the first connecting member side protrusion 512 is inserted into the expansion board side first elongated hole (expansion board side first hole) 2a of the expansion board 2, the expansion board contact portion of the first connecting member main body 511 511a contacts the back surface of the expansion board contact portion 511a.

The length D1 from the expansion board contact portion 511a of the first connecting member main body 511 to the first elongated hole (first hole on the first connecting member side) 51a on the first connecting member side (described later) is the length D1 of the first connecting member main body 511. and the length of the caster fixing member 4, so that the first connecting member main body 511 can be expanded so that the height of the expansion board 2 can be quickly adjusted according to the change in the height of the platform 71 of the trolley 7. It is preferable to create in advance several types of first connecting members 51 having different lengths D1 from the board contact portion 511a to the first long holes 51a on the first connecting member side.

The expansion board 2 has a pair of expansion board-side first elongated holes 2a into which the first connecting member-side protrusions 512 are inserted (see FIG. 7).

The first connecting member main body 511 has a first long hole 51a on the first connecting member side into which the caster fixing member side protrusion 42 is inserted (see FIG. 8).

As shown in FIG. 9, the second connecting member 52 includes a second connecting member main body 521 and a second connecting member side protrusion 522 continuous to the second connecting member main body 521.

The first connecting member side protrusion 512 has a first connecting member side second long hole (first connecting member side second hole) 51b into which the second connecting member side protrusion 522 is inserted. (See Figure 8).

As shown in FIG. 10, the third connecting member 53 includes a third connecting member main body 531,
It has a third connecting member side protrusion 532 that continues to the third connecting member main body 531.

The second connecting member main body 521 has a second connecting member side first elongated hole (second connecting member side first hole) 52a into which the third connecting member side protrusion 532 is inserted.

The expansion board 2 has a pair of expansion board-side second elongated holes (expansion board-side second holes) 2b into which the third connecting member-side protrusions 532 are inserted (see FIG. 7).

FIG. 5 is a diagram for explaining the deflection suppressing member 6 of the trolley expansion device 1 of FIG. 1, and FIG. 5(c) is a perspective view of the deflection suppressing member 6.

The deflection suppressing member 6 includes a cross-shaped deflection suppressing member main body 6A, a cross-shaped deflection suppressing member side first protrusion 6B connected to the deflection suppressing member main body 6A, and an I-shaped deflection continuous to the deflection suppressing member main body 6A. It has a second protrusion 6C on the suppressing member side.

The deflection suppressing member 6 includes a first deflection suppressing plate 61 and a second deflection suppressing plate 62 (see FIGS. 5(a) and 5(b)). 5(a) is a plan view of the first deflection suppressing plate 61, and FIG. 5(b) is a plan view of the second deflection suppressing plate 62.

As shown in FIG. 5A, the first deflection suppressing plate 61 is connected to a substantially rectangular first deflection suppressing plate side deflection suppressing plate main body 611 and a first deflection suppressing plate side deflection suppressing plate main body 611. It has a first convex portion 612 on the first deflection suppressing plate side and a first recess 613 on the first deflection suppressing plate side formed in the deflection suppressing plate main body 611 on the first deflection suppressing plate side.

The first convex portion 612 on the first deflection suppressing plate side is located at the center of one long side of the first deflection suppressing plate main body 611, and the first convex portion 612 on the first deflection suppressing plate side is located at the center of one long side of the first deflection suppressing plate main body 611. 613 is located at the center of the other long side of the first deflection suppressing plate side deflection suppressing plate main body 611.

As shown in FIG. 5B, the second deflection suppressing plate 62 is connected to a substantially rectangular second deflection suppressing plate side deflection suppressing plate main body 621 and a second deflection suppressing plate side deflection suppressing plate main body 621. A first convex portion 622 on the second deflection suppressing plate side, a second convex portion 624 on the second deflection suppressing plate side connected to the deflection suppressing plate main body 621 on the second deflection suppressing plate side, and a second convex portion 624 on the second deflection suppressing plate side. It has a first convex portion 622 on the side and a first concave portion 623 on the second deflection suppressing plate side formed in the deflection suppressing plate main body 621 on the second deflection suppressing plate side.

The second deflection suppressing plate side first convex portion 622 is located at the center of one long side of the second deflection suppressing plate side deflection suppressing plate main body 621.

The second deflection suppressing plate side first convex portion 622 is located at the center of the other long side of the second deflection suppressing plate side deflection suppressing plate main body 621. The second deflection suppressing plate side first recess 623 is formed from the second deflection suppressing plate side first convex portion 622 to the second deflection suppressing plate side deflection suppressing plate main body 621.

When the first recess 613 on the first deflection suppressing plate side of the first deflection suppressing plate 61 and the first recess 623 on the second deflection suppressing plate side of the second deflection suppressing plate 62 are fitted, the first The deflection suppressing plate 61 and the second deflection suppressing plate 62 are combined in a cross shape to form a cross-shaped deflection suppressing member main body 6A, a cross-shaped deflection suppressing member side first protrusion 6B, and an I-shaped deflection suppressing member. A second member-side protrusion 6C is formed (see FIG. 5(c)).

The caster fixing member main body 4 has a cross-shaped caster fixing member side hole 4a into which the first protrusion 6B on the deflection suppressing member side is inserted (see FIG. 6).

The expansion board 2 has a third elongated hole 2c on the expansion board side (third hole on the expansion board side) into which the second protrusion 6C on the deflection suppressing member side is inserted, and eight bolt holes 2d1 to 2d4. .

Four of the eight bolt holes 2d1 to 2d4 are formed on one side of the expansion board 2, and the remaining four bolt holes 2d1 to 2d4 are formed on the other side of the expansion board 2. (See Figure 7). The bolt through holes 2d1 to 2d4 are arranged at equal intervals along the front-rear direction of the truck 7.

To connect the expansion board 2 to the tip of the base 71 of the cart 7 with the bolts 8, insert the two bolts 8 passed through the two bolt holes (not shown) of the washer 9 into the four bolt holes 2d1 to 2d1. 2d4, screw into two of four screw holes (not shown) selected according to the outer diameter of the tire to be placed on the truck 7.

The washer 9 has two bolt holes, and the distance between the two bolt holes is equal to the distance between two adjacent bolt holes of the four bolt holes 2d1 to 2d4 of the expansion board 2.

When connecting the expansion board 2 to the stand 71 of the trolley 7 with the bolts 8, two bolt holes may be selected from the four bolt holes 2d1 to 2d4 depending on the outer diameter of the tire to be placed on the stand 71.

The tip of the expansion board 2 has a convex arc shape. In this way, damage to the tip of the expansion board 2 can be reduced.

The rear end of the expansion board 2 has a concave arc shape.
The expansion board 2, caster fixing member 4, and distance adjusting member 5 are each made of plastic cardboard.

As shown in FIG. 11, the caster 3 includes a main body 31, a top plate 32 connected to the upper part of the main body 31 via a rotating part, an axle 33 connected to the lower part of the main body 31, and a bearing on the axle 33. It has a wheel 34 connected through the vehicle.

The top plate 32 has a plurality of bolt holes 32a through which bolts (not shown) are passed.

Next, an example of how to use the trolley expansion device 1 will be explained.
It is assumed that before connecting the expansion board 2 of the trolley expansion device 1 to the platform 71 of the trolley 7, the first connecting member 51 corresponding to the height of the platform 71 of the trolley 7 is selected.

First, the pair of caster fixing member side protrusions 42 of the caster fixing member 4 are inserted into the first long hole 51a on the first coupling member side of the first coupling member 51 and connected to the first coupling member 51. , the cross-shaped deflection suppressing member side first protrusion 6B of the deflection suppressing member 6 is inserted into the cross-shaped caster fixing member side hole 4a of the caster fixing member 4, and connected to the caster fixing member 4.

Next, the first connecting member side protrusion 512 of the first connecting member 51 is inserted into the first long hole 2a on the expansion board side of the expansion board 2 to connect the first connecting member 51 to the expansion board 2. At the same time, the I-shaped second protrusion 6C on the deflection suppressing member side of the deflection suppressing member 6 is inserted into the third elongated hole 2c on the expansion board side of the expansion board 2 and connected to the expansion board 2.

Then, turn over the expansion board 2 so that the surface of the expansion board 2 is facing up, and insert the second connecting member side protrusion 522 of the second connecting member 52 into the second long hole 51b on the first connecting member side. to connect the second connecting member 52 to the first connecting member 51. As a result, the first connecting member 51 becomes difficult to detach from the expansion board 2.

Next, the third connecting member side protrusion 532 of the third connecting member 53 is inserted into the first long hole 52a on the second connecting member side and the second long hole 2b on the expansion board side of the expansion board 2. The third connecting member 53 is connected to the second connecting member 52 and the expansion board 2. As a result, the second connecting member 52 becomes difficult to separate from the first connecting member 51.

After that, turn over the expansion board 2 so that the back side of the expansion board 2 is facing up, place the top plate 32 of the upside down casters 3 on the caster fixing member 4, and connect the bolt holes 4b of the opposing caster fixing member 4 to the top plate 32. The caster 3 is fixed to the caster fixing member 4 by passing a bolt through the bolt through hole 32a and screwing a nut (not shown) into the tip of the bolt.

Finally, the expansion board 2 is turned over again so that the surface of the expansion board 2 is facing upward, and the rear end of the expansion board 2 is connected to the tip of the stand 71 of the cart 7 with the bolt 9. As a result, the platform 71 of the truck 7 is expanded, and the two tire groups (not shown) mounted adjacent to the platform 71 do not protrude significantly from the truck 7.

According to the trolley expansion device 1 of this embodiment, even if the outer diameter of the tires placed on the trolley 7 increases, a part of one of the two tire groups will largely protrude from the base 71 of the trolley 7. Therefore, the alignment of the plurality of tires constituting one tire group is stabilized.

Further, the distance adjusting member 5 is connected to a pair of first connecting members 51 that removably connects the caster fixing member 4 to the expansion board 2, and a pair of first connecting members 51 are each removably connected to the expansion board 2. Since the distance between the expansion board 2 and the caster fixing member 4 can be adjusted by constructing the pair of second connection members 52 that The height can be matched. As a result, the alignment of the plurality of tires constituting the tire group becomes more stable.

Since the deflection suppressing member 6 suppresses deflection of the caster fixing member 4, the movement of the caster 3 is stabilized.

Since the distance adjusting member 5 is composed of three types of connecting members: the first connecting member 51, the second connecting member 52, and the third connecting member 53, the second connecting member 52 is connected to the first connecting member 51. It becomes difficult to come off.

Next, a trolley expansion device according to a modified example of the present invention will be described based on FIG. 12.
Portions common to those in the above-described embodiments are designated by the same reference numerals, and descriptions thereof will be omitted. Hereinafter, only the main differences from the above-described embodiments will be explained. Except for the following differences, this modification has the same configuration as the above-described embodiment.

As shown in FIG. 12, each of the pair of first connecting members 151 of the trolley expansion device according to this modification includes a substantially rectangular first connecting member main body 1511 and a length of one of the first connecting member main bodies 1511. A first protrusion 1512 on the first connecting member side that is connected to a side portion (expansion board contact portion 1511a) and a first protrusion portion 1512 that is connected to the other long side portion (expansion board contact portion 1511b) of the first connection member main body 1511. 1 and a second protrusion 1513 on the connecting member side.

When the first protrusion 1512 on the first connecting member side is inserted into the first elongated hole 2a on the expansion board side of the expansion board 2, the expansion board contacting portion 1511a of the first connecting member main body 1511 Touch the back side. On the other hand, when the second protrusion 1513 on the first connecting member side is inserted into the first elongated hole 2a on the expansion board side of the expansion board 2, the expansion board contacting portion 1511b of the first connecting member main body 1511 Contact the back side of the expansion board 2.

When the platform 71 of the truck 7 is high, the second protrusion 1513 on the first connecting member side is inserted into the first long hole 2a on the expansion board side of the expansion board 2 with the second protrusion 1513 facing upward.

The first connecting member main body 1511 has a first connecting member side first long hole (first connecting member side first hole) 51a into which the caster fixing member side protrusion 42 is inserted.

The first connecting member side first protrusion 1512 is a first connecting member side second elongated hole (first connecting member side second hole) into which the second connecting member side protrusion 522 is inserted. 51b.

The first connecting member side second protrusion 1513 is a first connecting member side third elongated hole (first connecting member side third hole) into which the second connecting member side protrusion 522 is inserted. 51c.

According to the trolley expansion device of this modification, the same effects as the trolley expansion device 1 of the above-described embodiment are achieved, and the length from the expansion board contact portion 1511b to the first elongated hole 51a on the first connecting member side is Since D2 is longer than the length D1 from the expansion board contact portion 1511a to the first elongated hole 51a on the first connecting member side, the first connecting member 151 is turned upside down (the first connecting member side The height of the expansion board 2 can be adjusted by simply turning the protrusion 1513 of the expansion board 2 upward, improving work efficiency. If a deflection suppressing member is used at this time, it should be longer than the length in the vertical direction of the deflection suppressing member body 6A of the deflection suppressing member 6 described above by the difference between the length D1 and the length D2. A deflection suppressing member (not shown) having a deflection suppressing member body having a length in the vertical direction may be used.

In the above-mentioned embodiment, the distance adjustment member 5 is composed of three types of connection members: the first connection member 51, the second connection member 52, and the third connection member 53. It may be configured with only two types of connecting members, the connecting member 51 and the second connecting member 52.

In the embodiment described above, the expansion board 2, the caster fixing member 4, and the distance adjusting member 5 are each made of plastic cardboard, but their materials are not limited to plastic cardboard, and may be synthetic resin or metal other than plastic cardboard.

1 Bogie expansion device 2 Expansion board 2a First long hole on the expansion board side (first hole on the expansion board side)
2b Second long hole on the expansion board side (second hole on the expansion board side)
2c Third long hole on the expansion board side (third hole on the expansion board side)
2d1 to 2d4 Bolt through hole 3 Caster 31 Main body 32 Top plate 32a Bolt through hole 33 Axle 34 Wheel 4 Caster fixing member 4a Caster fixing member side hole 4b Bolt through hole 41 Caster fixing member main body 42 Caster fixing member side protrusion 5 Distance adjustment Member 51, 151 First connecting member 51a First long hole on the first connecting member side (first hole on the first connecting member side)
51b Second long hole on the first connecting member side (second hole on the first connecting member side)
51c Third long hole on the first connecting member side (third hole on the first connecting member side)
511, 1511 First connecting member main body 511a, 1511a, 1511b Expansion board contact portion 512 First connecting member side protrusion 1512 First connecting member side first protruding portion 1513 First connecting member side second protrusion Part 52 Second connecting member 52a Second connecting member side first long hole (second connecting member side first hole)
521 Second connecting member main body 522 Second connecting member side protrusion 53 Third connecting member 531 Third connecting member main body 532 Third connecting member side protruding portion 6 Deflection suppressing member 6A Deflection suppressing member main body 6B Deflection suppressing Member side first protrusion 6C Deflection suppressing member side second protrusion 61 First deflection suppressing plate 611 First deflection suppressing plate side deflection suppressing plate main body 612 First deflection suppressing plate side first convex part 613 First concave portion 62 on first deflection suppressing plate side Second deflection suppressing plate 621 Second deflection suppressing plate main body 622 First convex portion on second deflection suppressing plate side 623 Second deflection suppressing plate First concave part 624 Second convex part 7 on the second deflection suppressing plate Cart 71 Base 72 Caster 73 Handle 8 Bolt 9 Washers D1, D2 From the expansion board contact part to the first elongated hole on the first connecting member side length of

In order to solve the above-mentioned problem, the invention according to claim 1 provides an expansion board connected to a platform of a cart, a caster attached to the expansion board, a caster fixing member to which the caster is fixed, and a caster fixing member to which the caster is fixed. A trolley expansion device including a distance adjusting member that suspends a fixing member from the expansion board and adjusts a distance between the expansion board and the casters, wherein the caster fixing member is connected to the caster fixing member main body and the caster. a pair of first connecting members having a pair of caster fixing member side protrusions continuous to both ends of the fixing member main body, the distance adjusting member removably connecting the caster fixing member to the expansion board; a pair of second connection members that removably connect the pair of first connection members to the expansion board, and each of the pair of first connection members is connected to the first connection member main body; a first connecting member side protrusion connected to the first connecting member main body, and the expansion board has a pair of expansion board side first holes into which the first connecting member side protrusions are inserted. The first connecting member main body has a first connecting member side first hole into which the caster fixing member side protrusion is inserted, and the second connecting member has a second connecting member main body. and a second connecting member side protrusion continuous to the second connecting member main body, and the first connecting member side protrusion has a first connecting member side protrusion into which the second connecting member side protrusion is inserted. It is characterized by having a second hole on the connecting member side.

The invention according to claim 2 is the trolley expansion device according to claim 1 , wherein the distance adjusting member removably connects the pair of second connecting members to the pair of first connecting members. further comprising a pair of third connecting members, the third connecting member having a third connecting member main body and a third connecting member side protrusion continuous to the third connecting member main body, The second connecting member main body has a first hole on the second connecting member side into which the third connecting member side protrusion is inserted, and the expansion board has a first hole on the second connecting member side into which the third connecting member side protrusion is inserted. It is characterized by further having a pair of expansion board-side second holes into which the expansion board is inserted.

The invention according to claim 3 is the trolley expansion device according to claim 2 , further comprising a deflection suppressing member disposed between the expansion board and the caster fixing member to suppress deflection of the caster fixing member. It is characterized by

The invention according to claim 4 is the trolley expansion device according to claim 3 , in which the deflection suppressing member includes a deflection suppressing member main body and a cross-shaped deflection suppressing member side first portion connected to an upper end of the deflection suppressing member main body. and a second protrusion on the deflection suppressing member side that is continuous with the lower end of the deflection suppressing part main body, and the caster fixing member main body has a cross section into which the first protrusion on the deflection suppressing member side is inserted. The expansion board further includes a third expansion board hole into which the second projection on the deflection suppressing member is inserted.

According to a fifth aspect of the present invention, in the trolley expansion device according to the fourth aspect, the expansion board further includes a plurality of bolt holes.

According to a sixth aspect of the present invention, in the trolley expansion device according to the fifth aspect, the tip end of the expansion board has a convex arc shape.

According to a seventh aspect of the present invention, in the trolley expansion device according to the sixth aspect, the shape of the rear end portion of the expansion board is a concave arc shape.

The invention according to claim 8 is the trolley expansion device according to any one of claims 1 to 7 , characterized in that the expansion board, the caster fixing member, and the distance adjustment member are each made of plastic cardboard. shall be.

Claims (9)

An expansion board connected to the platform of the trolley,
casters attached to the expansion board;
a caster fixing member to which the casters are fixed;
A trolley expansion device comprising: a distance adjusting member that suspends the caster fixing member from the expansion board and adjusts a distance between the expansion board and the casters,
The caster fixing member is
A caster fixing member body;
a pair of caster fixing member side protrusions continuous to both ends of the caster fixing member main body,
The distance adjustment member is
a pair of first connecting members that removably connect the caster fixing member to the expansion board;
A trolley expansion device comprising: a pair of second connection members that removably connect the pair of first connection members to the expansion board. Each of the pair of first connecting members is
a first connecting member main body;
a first connecting member side protrusion continuous to the first connecting member main body,
the expansion board has a pair of expansion board-side first holes into which the first connecting member-side protrusions are inserted;
the first connecting member main body has a first hole on the first connecting member side into which the caster fixing member side protrusion is inserted;
The second connecting member is
a second connecting member main body;
a second connecting member side protrusion continuous to the second connecting member main body,
The trolley expansion device according to claim 1, wherein the first connecting member side protrusion has a first connecting member side second hole into which the second connecting member side protrusion is inserted. . The distance adjustment member is
further comprising a pair of third connecting members that removably connect the pair of second connecting members to the pair of first connecting members,
The third connecting member is
a third connecting member main body;
a third connecting member side protrusion continuous to the third connecting member main body,
The second connecting member main body is
a second connecting member side first hole into which the third connecting member side protrusion is inserted;
The trolley expansion device according to claim 2, wherein the expansion board further includes a pair of expansion board-side second holes into which the third connecting member-side protrusions are inserted. The trolley expansion device according to claim 3, further comprising a deflection suppressing member disposed between the expansion board and the caster fixing member to suppress deflection of the caster fixing member. The deflection suppressing member is
a deflection suppressing member main body;
a cross-shaped deflection suppressing member side first protrusion extending from the upper end of the deflection suppressing member main body;
a second protrusion on the deflection suppressing member side that is continuous with the lower end of the deflection suppressing portion main body;
The caster fixing member main body has a cross-shaped caster fixing member side hole into which the first protrusion on the deflection suppressing member side is inserted;
The trolley expansion device according to claim 4, wherein the extension board further has an expansion board-side third hole into which the deflection suppressing member-side second protrusion is inserted. The trolley expansion device according to claim 5, wherein the expansion board further has a plurality of bolt holes. The trolley expansion device according to claim 6, wherein the tip end of the expansion board has a convex arc shape. The trolley expansion device according to claim 7, wherein the rear end of the expansion board has a concave arc shape. The trolley expansion device according to any one of claims 1 to 8, wherein the expansion board, the caster fixing member, and the distance adjustment member are each made of plastic cardboard.

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