JP7055367B2 - Bogie - Google Patents

Description

In the present disclosure, the seat plate of the caster is slide-inserted into the slide engaging portion on the lower surface of the pedestal, and the retainer is received by the retainer receiving portion next to the slide engaging portion, so that the seat plate becomes the slide engaging portion. Regarding the dolly that is prevented from coming off.

As a conventional trolley of this type, a retainer having an engaging protrusion on one side surface and an elastic engaging piece on the opposite side surface is known. The retainer is pushed into the retainer receiving portion by being rotated around the engaging protrusion in a state where the engaging protrusion is engaged with the inlet portion of the slide engaging portion. Then, the elastic engaging piece engages with the engaged portion of the retainer receiving portion, and the retainer is held in the retainer receiving portion (see, for example, Patent Document 1).

Japanese Patent No. 5975935 (FIGS. 7 to 10)

However, in the above-mentioned conventional trolley, it is conceivable that the engagement of the engagement protrusion may be disengaged and the retainer may fall off from the retainer receiving portion due to deformation of the pedestal due to the load of luggage, impact during traveling, or the like. In order to deal with this, it is required to develop a dolly with higher assembly strength than before.

The invention of claim 1 made to solve the above-mentioned problems is that after the seat plate of the caster is slide-inserted into the slide engaging portion provided on the lower surface of the pedestal, the retainer receiving portion next to the slide engaging portion is provided. In a carriage in which the retainer is received and the seat plate is prevented from coming off by the retainer to the slide engaging portion, the first engaging hole that opens to the inner surface of the retainer receiving portion and one side surface of the retainer. A first engaging protrusion that protrudes and engages with the first engaging hole and serves as a rotation fulcrum of the retainer with respect to the retainer receiving portion, and at least one of the retainer and the retainer receiving portion. A rotation engaging portion that engages with each other through elastic deformation and restricts rotation of the retainer in a direction away from the retainer receiving portion, and a second portion that protrudes downward from the tip of the first engaging protrusion. A 1 return protrusion and a first locked portion formed on the pedestal and facing the first return protrusion to prevent the first engagement protrusion from coming off the first engagement hole. It is a trolley to prepare.

The invention according to claim 2 is the trolley according to claim 1, wherein the first return protrusion portion and the first locked portion can come into contact with each other in a state where the rotation engaging portions are engaged with each other.

According to the third aspect of the present invention, the first engaging protrusion is arranged at a position in the middle of the one side surface of the retainer in the vertical direction, and is below the first engaging protrusion of the one side surface of the retainer. The trolley according to claim 1 or 2, wherein an interference avoidance slope is formed which is inclined so as to be separated from the inner side surface of the retainer receiving portion as the distance from the first engaging protrusion is downward.

The invention of claim 4 is an elastic engaging piece having a cantilever structure and a second engaging protrusion on the tip end side thereof, and the rotating engaging portion of the retainer is the elastic engaging portion of the retainer receiving portion. The rotary engaging portion is a second engaging hole in which the second engaging protrusion is unevenly engaged, and the second return protrusion protruding downward from the tip of the second engaging protrusion and the said portion. 13. The trolley according to any one claim.

The invention according to claim 5 is the trolley according to claim 1, wherein the rotation axis direction of the retainer and the slide insertion direction are substantially parallel to each other.

According to the sixth aspect of the present invention, the retainer has a main body portion in which the lower ends of the first and second square cylinder portions extending in parallel in the vertical direction are connected to each other by a connecting portion, and the first section is described. The aspect according to any one of claims 1 to 5, wherein the collision portion is arranged in the first square cylinder portion, while the rotation engaging portion is arranged in the second square cylinder portion. It is a trolley described in.

In the bogie of claim 1, the first return protrusion protrudes downward from the tip of the first engagement protrusion, and the first return protrusion faces the first locked portion of the pedestal. 1 The engagement between the engaging protrusion and the first engaging hole becomes difficult to disengage, and the assembling strength becomes higher than before.

It should be noted that the first return protrusion portion and the first locked portion may not come into contact with each other within the clearance range in a state where the retainer and the rotation engaging portion of the retainer receiving portion are engaged with each other. It may be a structure that can be contacted (invention of claim 2). If the first return protrusion and the first locked portion can be in contact with each other, the load on the rotationally engaged portions that engage with each other on the opposite sides thereof is reduced.

In the trolley according to claim 3, since the interference avoidance slope is formed on the lower side of one side surface of the retainer from the first engaging protrusion, the rotation range of the retainer with respect to the retainer receiving portion is widened and the retainer is assembled. The rotation operation of is easy.

In the trolley according to claim 4, a second return protrusion is provided on the second engagement protrusion of the elastic engaging piece provided as the rotation engagement portion of the retainer, and the base is opposed to the second return protrusion. Since the second locked portion for preventing the second engaging protrusion from coming off to the second engaging hole is provided, both the first engaging protrusion and the second engaging protrusion are engaged with each other. Is hard to come off and the assembly strength is high.

If the rotation axis direction of the retainer and the slide insertion direction are made substantially parallel as in the configuration of claim 5, the load received by the retainer from the seat plate engaged with the slide engaging portion causes the retainer to rotate. It becomes difficult to act as. That is, the retainer's retaining function of the retainer receiving portion is enhanced.

In the dolly of claim 6, the main body portion communicates between the lower ends of the first and second square cylinder portions extending in the vertical direction by a connecting portion, and the load is applied to the first and second square cylinder portions. It can be dispersed and received, and the strength can be increased.

Bottom view of the dolly according to the first embodiment of the present disclosure. Perspective view of the first and second casters Perspective view of caster support and retainer receiving part Perspective view of the slide engagement part where the seat plate is slide-engaged Perspective view of the retainer receiving part that received the retainer Top view of the retainer Perspective view of the underside of the retainer Side cross section of the initial stage when assembling the retainer Side cross-sectional view of the intermediate stage when assembling the retainer Side sectional view of the state where the retainer assembly is completed Side sectional view of the second engaging protrusion of the second embodiment of the present disclosure.

[First Embodiment]
Hereinafter, FIGS. 1 to 10 show the dolly 10 of the present embodiment. The pedestal 11 of the trolley 10 is, for example, an injection-molded product of resin, and has a top plate 12 having a rectangular planar shape as shown in FIG. The lower surface of the top plate 12 is provided with a plurality of vertical ribs 14A extending in the vertical direction H1 and a plurality of horizontal ribs 14B extending in the horizontal direction H2. Further, a side wall 13 hangs down from the outer edge of the lower surface of the top plate 12 to surround the vertical ribs 14A and the horizontal ribs 14B. Further, a handle hole 15 is provided in the center of the base 11 in the vertical and horizontal directions.

Caster support portions 20 are provided at the four corners of the lower surface of the pedestal 11. In the present embodiment, a first caster 91 on which the wheel 90 cannot turn is attached to a pair of caster support portions 20 on one end side of the base 11 in the vertical direction H1, and a pair of caster supports on the other end side. A second caster 95 on which the wheel 90 can turn is attached to the portion 20.

Specifically, the first caster 91 has a structure in which a pair of legs 93, 93 supporting the axle 90S are bent downward at right angles from a pair of opposite sides of the rectangular seat plate 92. Further, the upper end portion of each leg portion 93 is shorter than one side of the seat plate 92, and the bending line of the seat plate 92 with the leg portion 93 is located inside the outer edge portion of the seat plate 92. The projecting pieces 92A and 92A are provided on both sides of the seat plate 92 with the leg portions 93 interposed therebetween.

On the other hand, in the second caster 95, the center plate 97B is rotatably connected to the lower surface of the rectangular seat plate 96. A pair of legs 97A and 97A that support the axle 90S are bent downward from the center plate 97B at a right angle.

As shown in FIG. 1, the caster support portions 20 at the four corners of the lower surface of the pedestal 11 described above have a pair of lateral ribs 14B and 14B that are adjacent to each other at one end side position and the other end side position in the longitudinal direction of the pedestal plate 11, respectively. It is arranged between the two, and is symmetrically arranged in both the vertical and horizontal directions H1 and H2 of the pedestal 11.

Specifically, the pair of lateral ribs 14B and 14B having the caster support portions 20 in between are provided with trapezoidal protrusions 24 and 24 protruding downward from positions near both ends in the longitudinal direction thereof. Further, as shown in FIG. 3, of the pair of horizontal ribs 14B and 14B, the portions having the trapezoidal protrusions 24 and 24 are connected between the one ends by the first connecting rib 21 and are close to one end. The positions are connected to each other by the second connecting rib 22, and the other ends are connected to each other by the third connecting rib 23. The portion surrounded on all sides by the first connecting rib 21 and the second connecting rib 22 and the pair of lateral ribs 14B and 14B forms the retainer receiving portion 30, and the second connecting rib 22 and the third connecting rib 23 and 1 are formed. The portion surrounded on all sides by the pair of lateral ribs 14B and 14B forms the caster support portion 20. The retainer receiving portion 30 is arranged on the base 11 on the center side of the lateral direction H2 from the caster supporting portion 20.

The lower surfaces of the first and second connecting ribs 21 and 22 are located slightly above the lower surface of the trapezoidal protrusion 24. Further, the central portion of the first connecting rib 21 in the width direction of the surface facing the second connecting rib 22 is slightly recessed in a stepped shape. Further, the second connecting rib 22 has a slightly stepped central portion in the width direction on both the front and back surfaces and the lower surface. The lower surface of the first connecting rib 21 and the lower surfaces of both ends of the second connecting rib 22 in the width direction are flush with each other. Further, the lower surfaces of the plurality of vertical ribs 14A arranged between the pair of first connecting ribs 21 and 21 between the horizontal ribs 14B and 14B are also flush with the lower surface of the first connecting rib 21. .. Further, between the second connecting rib 22 and the third connecting rib 23, a plurality of ribs 26 project from the facing surfaces of the lateral ribs 14B and 14B toward each other, and the lower surface of the ribs 26 is also the first connecting rib. It is flush with the lower surface of 21. Further, the central portion in the width direction of the second connecting rib 22 and the central portion in the width direction of the third connecting rib 23 are connected by an orthogonal rib 27. The entire lower surface of the orthogonal rib 27 except for the end portion on the second connecting rib 22 side is flush with both ends of the lower surface of the second connecting rib 22. The end of the lower surface of the orthogonal rib 27 on the side of the second connecting rib 22 is inclined so as to slightly rise toward the center of the lower surface of the second connecting rib 22, and the end thereof is the second connecting rib 22. It is located at the same height as the central part of the lower surface of.

The third connecting rib 23 protrudes significantly downward as compared with the first and second connecting ribs 21 and 22, and the lower surface thereof is flush with the lower surface of the trapezoidal protrusion 24. Further, from the position near the lower end of the facing surfaces of the trapezoidal protrusions 24, 24, the engaging protrusions 28, 28 project to the side approaching each other. The engaging protrusions 28, 28 have a strip-like shape extending in the lateral direction H2, and have a grid-like reinforcing rib 28B on the lower surface, and the lower surface of a part of the reinforcing rib 28B is flush with the lower surface of the trapezoidal protrusion 24. It has become. One end of the engaging protrusion 28 is connected to the third connecting rib 23, and the lower surface of the reinforcing rib 28B and the lower surface of the third connecting rib 23 are flush with each other at the connecting portion. At the central portion of the engaging projectile 28 in the longitudinal direction, the reinforcing rib 28B is gradually lowered toward the tip of the engaging projectile 28.

The upper surface of the engaging protrusion 28 is located slightly below the lower surface of the rib 26 group and the second connecting rib 22. A slide engaging portion 33 is formed between the upper surface of the engaging projectile 28 and the lower surface of the rib 26 group and the second connecting rib 22. The surfaces of the engaging protrusion 28 and the second connecting rib 22 facing the first connecting rib 21 side are flush with each other.

As shown in FIG. 4, the seat plate 92 of the first caster 91 is slide-inserted into the slide engaging portion 33 from the second connecting rib 22 side. When one side surface of the seat plate 92 comes into contact with the third connecting rib 23, the side surface on the opposite side becomes substantially flush with the inner side surface of the retainer receiving portion 30 in which the slide engaging portion 33 opens. Then, as shown in FIG. 5, the retainer 50 described later is received by the retainer receiving portion 30, so that the seat plate 92 is prevented from coming off by the slide engaging portion 33. The same applies to the seat plate 96 of the second caster 95.

As shown in FIG. 4, of the pair of lateral ribs 14B and 14B, the pair of facing walls 25 and 25 of the retainer receiving portion 30 sandwiched between the first and second connecting ribs 21 and 22 are a pair. The lateral ribs 14B and 14B are stepped away from each other with respect to the whole. Further, those stepped surfaces are flush with the facing surfaces of the first and second connecting ribs 21 and 22.

A first engaging hole 31 is formed in one of the facing walls 25 and 25 located on the center side of the base plate 11 in the vertical direction H1, and a second engaging hole 31 is formed in the other facing wall 25. The hole 32 is formed. The first and second engaging holes 31 and 32 both form a quadrangle, the first engaging hole 31 is arranged near the lower end of one facing wall 25, and the second engaging hole 32 is the other facing wall. It is arranged near the upper end of 25. Further, as shown in FIG. 8, a guide surface 25S is formed on the facing wall 25 having the second engaging hole 32 by chamfering the corners of the inner side surface and the lower surface by C chamfering.

As shown in FIG. 6, the retainer 50 has first and second square cylinder portions 51 and 52 extending in parallel in the vertical direction and aligned in the vertical direction H1. Then, the lower ends of the first and second square tube portions 51 and 52 are communicated with each other by the connecting portion 56 to form the main body portion 50H of the retainer 50.

The first square tube portion 51 has approximately twice the size of, for example, the second square tube portion 52 in the vertical direction H1, and the first and second square tube portions 51 in the horizontal direction H2 and the vertical direction. 52 have the same size.

Further, the upper ends of the first and second square cylinder portions 51 and 52 are opened as shown in FIG. 6, and the lower ends are formed by a bottom wall 70 extending over the entire vertical direction H1 of the retainer 50 as shown in FIG. It is blocked. Further, as shown in FIG. 8, a reinforcing rib 59 that stands upright from the bottom wall 70 is provided in the lower portion of the first square tube portion 51. In the second square tube portion 52, the distance L1 between the inner side surfaces facing each other in the vertical direction H1 and the distance L2 between the reinforcing rib 59 and the wall portion facing the reinforcing rib 59 in the vertical direction H1 are substantially the same. .. Further, when the retainer 50 is accommodated in the retainer receiving portion 30, the reinforcing rib 59 is located in front of the seat plates 92 and 96 in the slide engaging portion 33 (see FIG. 10).

As shown in FIG. 7, the connecting portion 56 includes a lower beam 54A which is a part of the bottom wall 70 passed between the lower ends of the first and second square cylinder portions 51 and 52, and the first beam. A rib that is passed between the intermediate portions of the second square cylinder portions 51 and 52 and connects the upper beam 54B parallel to the lower beam 54A and the central portion of the upper beam 54B and the lower beam 54A in the width direction. It consists of 55 and a pair of ribs 53, 53 that stand up from both side edges of the upper beam 54B and connect between the first and second square cylinder portions 51, 52.

As shown in FIG. 7, a stepped surface 51D is formed in the middle portion in the vertical direction on the side surface 51A on the opposite side of the second square cylinder portion 52 of the first square cylinder portion 51. The lower side surface 51C below the stepped surface 51D of the side surface 51A is displaced from the upper upper side surface 51B toward the second square tube portion 52. Further, the corner portion where the lower side surface 51C and the lower surface of the first square cylinder portion 51 intersect is chamfered to form an interference avoidance slope 58.

The first square tube portion 51 is provided with a first engaging protrusion 60 that engages with the first engaging hole 31 of the retainer receiving portion 30 described above. The first engaging protrusion 60 is an L-shaped rib 60A that protrudes horizontally from the lower edge portion of the upper side surface 51B and is bent downward at a right angle, and extends horizontally from a position near the lower end of the lower side surface 51C and is L-shaped. It consists of a horizontal rib 60B connected to the rib 60A and a rib 60C connecting between the L-shaped rib 60A and the center of the horizontal rib 60B in the width direction. Further, the lower end of the L-shaped rib 60A protrudes downward from the horizontal rib 60B to form a first return protrusion 60T. Further, the L-shaped rib 60A and the horizontal rib 60B are narrower than the side surface 51A.

As shown in FIG. 6, the second square tube portion 52 is provided with an elastic engaging piece 61, and the elastic engaging piece 61 and the above-mentioned second engaging hole 32 form a retainer 50 and a retainer receiving portion. Each of the 30 rotation engaging portions is adapted to engage with each other. Specifically, the bottom wall 70 is extended from the second square tube portion 52 to the opposite side of the first square tube portion 51, and the elastic engaging piece 61 is bent at a right angle upward from the tip thereof. The upper end of the elastic engaging piece 61 is located slightly below the upper end of the second square tube portion 52. Further, the upper end portion of the elastic engaging piece 61 is provided with a second engaging protrusion 62 on a surface facing the side opposite to the second square cylinder portion 52. The second engaging protrusion 62 has a wedge shape in which the amount of protrusion from the elastic engaging piece 61 gradually increases from the upper end of the elastic engaging piece 61 downward. Further, the width of the second engaging protrusion 62 is narrower than that of the main body portion of the elastic engaging piece 61.

A pair of ribs 64, 64 is connected between the elastic engaging piece 61 and the lower end portion of the facing surface of the second square cylinder portion 52. The pair of ribs 64, 64 communicates between the side edges of the elastic engagement piece 61 and the second square tube 52, and also connects to the bottom wall 70. Further, a pair of ridges 63, 63 is extended from a pair of ribs 64, 64 on both side edges of a portion of the facing surface of the second square tube portion 52 above the rib 64.

This concludes the description of the configuration of the carriage 10 of the present embodiment. Next, the action and effect of the carriage 10 will be described. The first and second casters 91 and 95 are attached to the carriage 10 of the present embodiment as follows.

For example, the pedestal 11 is turned inside out to mount the first and second casters 91, 95. Then, the seat plates 92, 96 of the first and second casters 91, 95 are placed on the first connecting rib 21 and the vertical rib 14A next to the first connecting rib 21, for example, and are placed in the slide engaging portion 33. And slide is inserted. Then, as described above, one side surface of the seat plates 92 and 96 abuts on the third connecting rib 23, and the opposite side surface thereof is substantially flush with the inner surface surface of the retainer receiving portion 30 (FIG. 4). reference). Further, the ribs 26 group, the orthogonal ribs 27 and the second connecting ribs 22 abut on the upper surfaces of the seat plates 92 and 96.

The retainer 50 is then assembled within the retainer receiving section 30. Therefore, as shown in FIG. 8, the retainer 50 is tilted at an angle of, for example, approximately 45 degrees with respect to the vertical direction, and the first square tube portion 51 side is received by the retainer receiving portion 30, and the first engagement hole is formed. The first engaging protrusion 60 is arranged to face the 31. Then, as shown in FIG. 9, the retainer 50 is horizontally paralleled while maintaining the inclined posture, and the first engaging protrusion 60 is inserted into the first engaging hole 31 from the first return protrusion 60T side, and the retainer 50 is inserted. The interference avoidance slope 58 is pressed against the opening edge of the first engagement hole 31.

In this state, the retainer 50 is rotated around the first engaging protrusion 60 as a rotation fulcrum, and the second square tube portion 52 is inserted into the retainer receiving portion 30. Then, as shown in FIG. 9, the tip of the elastic engagement piece 61 of the retainer 50 or the second engagement protrusion 62 of the elastic engagement piece 61 with respect to the guide surface 25S of the opening edge of the retainer receiving portion 30. Abuts on the slope 62S of.

From there, the retainer 50 is further rotated toward the retainer receiving portion 30, and the retainer 50 is inserted to the inner part of the retainer receiving portion 30 through elastic deformation of the elastic engaging piece 61. Then, as shown in FIG. 10, the second engaging protrusion 62 of the elastic engaging piece 61 engages with the second engaging hole 32 of the retainer receiving portion 30, and the retainer 50 is prevented from coming off by the retainer receiving portion 30. To. Then, the seat plates 92, 96 (only the seat plate 92 is shown in FIG. 10) are restricted from moving in the direction of coming out of the slide engaging portion 33 by the retainer 50, and the seat plates 92, 96 support the casters. It is held by the unit 20. As described above, the first and second casters 91 and 95 are attached to the base 11.

If the second engaging protrusion 62 is pressed from the outside of the retainer receiving portion 30, the engagement with the second engaging hole 32 can be easily released. Then, if the retainer 50 is taken out from the retainer receiving unit 30 by performing the reverse operation to the above operation, the first and second casters 91 and 95 can be replaced. At that time, by pinching the lower beam 54A of the retainer 50, the retainer 50 can be easily taken out from the retainer receiving portion 30.

By the way, for example, the pedestal 11 and the retainer 50 may be deformed by the load, impact, vibration, etc. that the trolley 10 receives during use. However, in the trolley 10 of the present embodiment, the first return protrusion 60T protrudes from the tip of the first engagement protrusion 60, and the first engagement is the opening edge of the first engagement hole 31 of the pedestal 11. Since it faces the stop portion 31A, the engagement between the first engagement protrusion 60 and the first engagement hole 31 is difficult to disengage. That is, the dolly 10 of the present embodiment has higher assembly strength than the conventional one, and can be used stably.

Further, the rotation axis direction of the retainer 50 and the slide insertion direction are substantially parallel, and the load received by the retainer 50 from the seat plates 92 and 96 is unlikely to act as a force for rotating the retainer 50. Further, the main body portion 50H of the retainer 50 communicates between the lower ends of the first and second square cylinder portions 51 and 52 extending in parallel in the vertical direction by the connecting portion 56, and the load is set to the first. It can be dispersed and received by the second square cylinder portions 51 and 52. These also increase the assembly strength of the dolly 10 and enable stable use.

Further, as described above, since the first engaging protrusion 60 is provided with the first return protrusion 60T, the first engaging protrusion that becomes the center of rotation when the rotation operation is performed when the retainer 50 is assembled. The position of the portion 60 is stable, and the assembly work becomes easy. Further, since the interference avoidance slope 58 is formed below the first engaging protrusion 60 of the retainer 50, the rotation range of the retainer 50 with respect to the retainer receiving portion 30 is widened, and the retainer 50 can be easily operated. Become.

In the above embodiment, the first return protrusion 60T and the first locked portion 31A may come into contact with each other within the clearance range in a state where the retainer 50 is received to the inner part of the retainer receiving portion 30. , It doesn't have to be. If the structure is such that the first return protrusion 60T and the first locked portion 31A can come into contact with each other, the load received by the elastic engaging piece 61 is reduced.

[Second Embodiment]
This embodiment is shown in FIG. 11 and differs from the first embodiment only in that the second engaging protrusion 62 of the retainer 50V is provided with the second return protrusion 80. Specifically, the second return protrusion 80 projects stepwise from the tip edge of the lower surface of the second engagement protrusion 62. Then, when the retainer 50V is received to the inner part of the retainer receiving portion 30, the second engaging protrusion 62 enters and engages with the second engaging hole 32 together with the second return protrusion 80, and the retainer 50V is engaged by its own weight. As it descends, the second return protrusion 80 faces the second locked portion 81, which is the opening edge of the second engagement hole 32. As a result, in the present embodiment, both the first and second engaging protrusions 60 and 62 are less likely to be disengaged by the first and second return protrusions 60T and 80, respectively, and the assembly strength is increased. Will be higher.

[Other embodiments]
(1) In the above embodiment, when the retainers 50 and 50V are rotated, the direction of the rotation shaft and the slide insertion direction of the seat plates 92 and 96 into the slide engaging portion 33 are substantially parallel. They may be orthogonal. Specifically, for example, the space between the first connecting rib 21 and the second connecting rib 22 of the first embodiment is widened, and the retainer 50 is correspondingly enlarged in the lateral direction H2 to increase the second connecting rib. The first engaging hole 31 is provided on the 22 side, while the second engaging hole 32 is provided on the first connecting rib 21 side, and the retainer 50 is associated with the first engaging protrusion 60 and the elastic engaging piece 61. And may be provided.

(2) In the above embodiment, the retainer 50 is provided with the elastic engaging piece 61 and the retainer receiving portion 30 is provided with the second engaging hole 32, but these are reversed and the retainer receiving portion 30 is elastically engaged. The unit 61 may be provided, and the retainer 50 may be provided with a second engagement hole 32.

10 trolley 11 pedestal 30 retainer receiving part 31 first engaging hole 31A first locked part 32 second engaging hole 33 slide engaging part 50, 50V retainer 50H main body part 51 first square tube part 52 second Square cylinder part 56 Communication part 58 Interference avoidance slope 60 First engagement protrusion 60T, 80 Return protrusion 61 Elastic engagement piece 62 Second engagement protrusion 81 Second locked part 91 First caster 92,96 Seat plate 95 2nd caster

Claims (6)

After the seat plate of the caster is slide-inserted into the slide engaging portion provided on the lower surface of the pedestal, the retainer is received by the retainer receiving portion next to the slide engaging portion, and the seat plate is slid by the retainer. In the trolley that is prevented from coming off by the engaging part
A first engaging hole that opens on the inner surface of the retainer receiving portion,
A first engaging protrusion that protrudes from one side surface of the retainer and engages with the first engaging hole and serves as a rotation fulcrum of the retainer with respect to the retainer receiving portion.
A rotation engaging portion formed on the retainer and the retainer receiving portion, engaged with each other through at least one elastic deformation, and restricting rotation of the retainer in a direction away from the retainer receiving portion.
A first return protrusion protruding downward from the tip of the first engagement protrusion,
A dolly including a first locked portion formed on the pedestal, which faces the first return protrusion and prevents the first engagement protrusion from coming off the first engagement hole. The trolley according to claim 1, wherein the first return protrusion and the first locked portion can come into contact with each other in a state where the rotation engaging portions are engaged with each other. The first engaging protrusion is arranged at an intermediate position in the vertical direction of the one side surface of the retainer.
On the lower side of the one side surface of the retainer from the first engaging protrusion, there is an interference avoidance slope that inclines so as to move away from the inner side surface of the retainer receiving portion as the distance from the first engaging protrusion decreases downward. The trolley according to claim 1 or 2 which is formed. The rotary engaging portion of the retainer is an elastic engaging piece having a cantilever structure and a second engaging protrusion on the tip end side thereof.
The rotation engaging portion of the retainer receiving portion is a second engaging hole in which the second engaging protrusion is unevenly engaged.
A second return protrusion protruding downward from the tip of the second engagement protrusion, and a second return protrusion.
Claims 1 to 3 include a second locked portion formed on the pedestal and facing the second return protrusion to prevent the second engaging protrusion from coming off the second engaging hole. The dolly according to any one of claims. The trolley according to claim 1, wherein the rotation axis direction of the retainer and the slide insertion direction are substantially parallel to each other. The retainer has a main body portion formed by connecting the lower ends of the first and second square cylinder portions extending in parallel in the vertical direction with each other by a connecting portion.
The first engaging protrusion is arranged in the first square cylinder portion, while the rotary engaging portion is arranged in any of the second square cylinder portions, according to any one of claims 1 to 5. The dolly described in claim 1.

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