JP2020084519A - Movable protective fence - Google Patents

Abstract

To provide a movable protective fence capable of preventing a caster body from scattering greatly when a vehicle collides with the movable protective fence.SOLUTION: A movable protective fence 1 comprises a caster 10, the caster 10 includes a caster body 18 having a wheel 52 and a wheel supporting part 54, a mounting shaft 12 mounted on a base plate 2 and extending downward from the base plate 2, and a bearing apparatus 14 interposed between the mounting shaft 12 and the wheel supporting part 54 to allow turning of the wheel supporting part 54 taking the shaft center of the mounting shaft 12 as the center, and the movable protective fence 1 comprises a scatter preventing member 63 connecting the wheel supporting part 54 and the mounting shaft 12 so as to prevent scattering of the caster body 18 from the mounting shaft 12 while allowing the wheel supporting part 54 to turn with an outer ring member 36 of the bearing apparatus 14.SELECTED DRAWING: Figure 3

Description

The present invention relates to a movable guard fence.

BACKGROUND ART Conventionally, as protective fences installed along roads, for example, various protective fences installed at median strips of roads or at boundaries between roads and sidewalks are known.

The following Patent Document 1 discloses a movable protective fence capable of moving along the ground. The movable protective fence is installed in the median strip of the road during normal use, but it can be moved from its installation place in an emergency. Specifically, the movable protection fence is movable along the ground and has a plurality of movable-side members each having a vertically extending cylindrical column, and extends in a direction crossing the columns of the plurality of movable-side members. In addition, it is provided with a beam connecting the columns, a plurality of fixed tubes fixed to the ground, and a plurality of connecting members housed in the columns of the movable side members so as to be movable in the vertical direction.

During normal use of the movable protective fence, at the installation location, each connecting member is arranged so as to straddle the space inside the column and the space inside the corresponding fixed pipe, and the connecting member connects the column to the corresponding fixed pipe. By doing so, the movable member is fixed so as not to move. On the other hand, in an emergency, each connecting member is pulled up so as to be separated from the fixed pipe, and the connection between the support column of each movable member and the corresponding fixed pipe is released by each connecting member. Thereby, each movable member can be moved, whereby the movable protective fence can be moved from the installation place.

The movable-side member has a support base that is arranged substantially horizontally and on which the pillar is erected, and a plurality of casters attached to the support base so as to project downward from the support base. Each caster is configured to be freely rollable on the ground in any direction, and the function of this caster allows the movable member to move.

Japanese Patent No. 6014782

A caster as described above is generally a caster body having a wheel that comes into contact with the ground and rolls, and a wheel support portion that supports the wheel so that the wheel can rotate about a horizontal axis, and the support. The mounting shaft mounted on the base and extending downward from the support base is interposed between the mounting shaft and the wheel support so that the wheel support can pivot with respect to the mounting shaft about the axis of the mounting shaft. Mounted bearing device.

The bearing device includes an inner ring member fixed to the mounting shaft so as to be coaxial with the mounting shaft, and an outer ring member mounted to the inner ring member so as to be rotatable with respect to the inner ring member about an axis of the mounting shaft. And have. The wheel support portion of the caster body has a peripheral portion that is arranged so as to surround the outer ring member and is crimped to the outer ring member. By thus crimping the peripheral edge portion of the wheel support portion to the outer ring member, the wheel support portion is fixed to the outer ring member, and as a result, the caster body can rotate with respect to the inner ring member and the mounting shaft together with the outer ring member. Is becoming

By the way, when a vehicle collides with a movable protective fence having such casters, a very large force resulting from the collision acts on the casters, which may cause the caster main body to disengage from the mounting shaft and the bearing device and to be greatly scattered. is there.

Specifically, when the vehicle collides with the movable protection fence, a large force acts on the pillar to tilt the support pillar of the movable protection fence to the side opposite to the road on which the vehicle was traveling. At this time, the support base and the mounting shaft of the caster mounted on the support base and the bearing device are tilted together with the support column, and as a result, the outer ring member of the bearing device is pulled down obliquely while pulling out the outer ring member from the peripheral portion of the wheel support portion. Such a force acts to release the pressure contact between the peripheral portion and the outer ring member of the bearing device. As a result, the caster body separates from the mounting shaft and the bearing device. At the same time, the caster body is sandwiched between the diagonally inclined support base and the ground and compressed, and the compression force causes the vehicle with a large distance between the support base and the ground, that is, the vehicle that collides with the movable protective fence. Is ejected to the side of the road that was driving.

An object of the present invention is to provide a movable protective fence that can prevent the caster body from largely scattering when a vehicle collides with the movable protective fence.

In order to achieve the above object, for example, by welding the wheel support portion of the caster body to the base plate or fastening them with bolts and nuts, the wheel support portion is removed from the base plate by a force acting on the caster during a vehicle collision. It is conceivable to fix the wheel support to the base plate so as not to separate. However, in this case, since the caster body cannot rotate about the vertical axis, the function of the movable protective fence being able to freely change the direction along the ground is lost. Then, in order to solve such a subject, the inventor of this application invented the following movable protection fences.

The movable protection fence provided by the present invention is a movable protection fence installed at a predetermined location adjacent to a road and the road, and the movable protection fence has the movable protection fence installed at the predetermined location. Sometimes a beam that is arranged so as to extend along the road, a base plate that is arranged along the ground at a position that is spaced upward from the ground, a column that stands on the base plate and supports the beam, and A caster attached to the base plate so as to project downward from the base plate and configured to be movable along the ground. The caster is a caster body having a wheel that is in contact with the ground and rolls, and a wheel support portion that supports the wheel so that the wheel is rotatable about a horizontal axis; A mounting shaft extending downward, and a bearing interposed between the mounting shaft and the wheel support part such that the wheel support part can pivot with respect to the mounting shaft about the axis of the mounting shaft. And a device. The bearing device includes an inner ring member fixed to the mounting shaft so as to be coaxial with the mounting shaft, and an inner ring member that is rotatable with respect to the inner ring member about an axis of the mounting shaft. And an attached outer ring member. The wheel support portion has a peripheral edge portion surrounding the outer ring member, and the wheel support portion is fixed to the outer ring member by crimping the peripheral edge portion to the outer ring member. The movable guard fence allows the wheel support portion to pivot with respect to the mounting shaft and the inner ring member together with the outer ring member, while preventing the caster body from scattering from the mounting shaft. A scattering prevention member that connects the support portion and the mounting shaft is further provided.

In this movable guard fence, the scattering prevention member allows the wheel support portion of the caster body to pivot with respect to the mounting shaft and the inner ring member together with the outer ring member of the bearing device, while preventing the scattering of the caster body from the mounting shaft. Since the wheel support and the mounting shaft are connected so as to restrain the caster, the caster is protected from collision when the vehicle collides with the moveable guard while maintaining the function that the moveable guard can freely change the direction of the caster along the ground. The main body can be prevented from scattering greatly.

Specifically, in this movable protective fence, the vehicle collides with the movable protective fence, and the force acting on the caster at that time releases the crimping of the peripheral portion of the wheel support part to the outer ring member of the bearing device, and the caster body is attached. Even if the caster body is disengaged from the shaft and the bearing device, the caster body is prevented from being greatly scattered from the mounting shaft and the bearing device by the scattering suppressing member that connects the wheel support portion of the caster body and the mounting shaft attached to the base plate. Can be deterred.

Further, in this movable protective fence, the scattering prevention member that connects the wheel support portion of the caster body and the mounting shaft attached to the base plate, the wheel support portion of the caster body together with the outer ring member of the bearing device to the mounting shaft and inner ring member. Since the caster body is allowed to turn relative to the caster body, the function of the caster that allows the caster body to turn can be maintained, and as a result, the function that the movable guard fence can freely turn around along the ground can be maintained.

The scattering prevention member has a mounting shaft mounting portion mounted on the mounting shaft, and the mounting shaft mounting portion has an insertion hole through which the mounting shaft is inserted, and is inserted into the insertion hole. The mounting shaft is preferably attached to the mounting shaft by surrounding the mounting shaft.

In this configuration, since the mounting shaft mounting portion of the scattering suppressing member is mounted on the mounting shaft by surrounding the mounting shaft inserted in the insertion hole, when the scattering suppressing member suppresses scattering of the caster body. Even if a large force is applied to the scattering prevention member, it is possible to prevent the mounting shaft mounting portion from coming off the mounting shaft.

The scattering prevention member further includes a wheel supporting portion mounting portion mounted on the wheel supporting portion of the caster body, and an intermediate connecting portion connecting the mounting shaft mounting portion and the wheel supporting portion mounting portion, The mounting shaft mounting portion, the wheel supporting portion mounting portion and the intermediate connecting portion are formed of a single metal plate, the insertion hole penetrates the mounting shaft mounting portion in the plate thickness direction of the metal plate, It is preferable that the mounting shaft mounting portion is mounted so as to be rotatable with respect to the mounting shaft about the axis of the mounting shaft.

According to this configuration, the mounting shaft and the wheel supporting part of the caster body are connected by the mounting shaft mounting part, the wheel supporting part mounting part, and the intermediate coupling part of the scattering suppressing member formed of a single metal plate. As compared with the case where the mounting shaft and the wheel supporting portion of the caster body are connected by a flexible cord, for example, the wheel supporting portion of the caster body can be more firmly connected to the mounting shaft. Therefore, the caster body can be more reliably prevented from scattering. Further, when the attachment shaft and the wheel support portion are connected by the cord, the cord may wind around the caster body while the caster body turns many times, and the turning of the caster body may be hindered. However, in this configuration, the mounting shaft mounting portion, the wheel support mounting portion, and the intermediate coupling portion of the scattering prevention member are formed of a single metal plate, and the mounting shaft mounting portion of the scattering prevention member is attached to the mounting shaft. Since the caster body is rotatably mounted on the mounting shaft about the shaft center, when the caster body pivots with respect to the mounting shaft, the anti-scattering member works together with the caster body without obstructing the pivoting of the caster body. Can be swiveled around the mounting axis. Therefore, in this configuration, even when the caster body turns for many rounds, the turning of the caster body is not hindered by the scattering prevention member.

The wheel support portion has an axle that penetrates and supports the wheel so that the wheel can rotate, and an axle holding portion that holds the axle so that the axle extends in a horizontal direction. The axle holding portion has a pair of side wall portions arranged on both sides of the wheel in a direction along the axial direction of the wheel, and the axle penetrates one side wall portion of the pair of side wall portions. It is preferable that the wheel support attachment portion is attached to the protrusion of the axle.

With this configuration, the wheel support portion mounting portion of the scattering prevention member can be attached to the wheel support portion using the axle, so that the portion for attaching the wheel support portion mounting portion of the scattering prevention member is set to the wheel support portion. It is possible to prevent the caster configuration from becoming complicated as compared with the case where the casters are separately provided.

As described above, according to the present invention, it is possible to prevent the caster main body from being largely scattered when a vehicle collides with the movable protective fence while maintaining the function that the movable protective fence can freely change the direction along the ground. Can provide a deterrent movable guard fence.

FIG. 3 is a front view of a plurality of movable protection fences in a state where a plurality of movable protection fences are installed side by side according to an embodiment of the present invention. It is sectional drawing of the movable guard fence along the II-II line in FIG. It is a figure showing a state where the caster of the movable guard fence and the base plate are attached along the caster along the axial direction of the wheels of the caster. It is the figure which looked at the caster and base plate shown in FIG. 3 from the IV direction in FIG. FIG. 5 is a view showing the caster and the base plate shown in FIG. 4 partially broken along the axial center of the mounting shaft in the vicinity of the connection portion of the wheel support portion of the caster body with respect to the mounting shaft. It is sectional drawing which followed the VI-VI line in FIG. It is a front view of the scattering prevention member used for the caster. It is the figure which looked at the said scattering prevention member from the VIII direction in FIG. It is the figure which looked at the said scattering prevention member from the IX direction in FIG. It is a figure for demonstrating the process which the coupling|bonding of the wheel support part of a caster main body and the outer ring member of a bearing device is disengaged by the force which acts on a base plate and a caster, when a vehicle collides with a movable guard fence. It is a figure for demonstrating the process which the coupling|bonding of the wheel support part of a caster main body and the outer ring member of a bearing device is disengaged by the force which acts on a base plate and a caster, when a vehicle collides with a movable guard fence. It is a figure corresponding to FIG. 3 which shows the scattering prevention member and the caster to which it was attached by one modification of this invention. FIG. 13 is a view of the scattering prevention member and the caster according to the modified example shown in FIG. 12 viewed from the XIII direction in FIG. 12 in a state in which the intermediate connecting portion of the scattering prevention member is removed. FIG. 6 is a view corresponding to FIG. 4 showing a scattering prevention member and casters to which the scattering prevention member is mounted according to another modification of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The movable guard fence 1 according to the embodiment of the present invention is installed on various places such as on a road, a place adjacent to the road, and a boundary between a sidewalk and a roadway. For example, the movable protective fence 1 according to the present embodiment is installed on the median strip of highways and other roads. At that time, as shown in FIG. 1, a plurality of movable protective fences 1 are installed side by side. The plurality of movable guard fences 1 are arranged along the road so that each movable guard fence 1 extends along the road, partitioning the roads on both sides of the median strip from one road to the opposite lane. Prevent vehicles from entering the road. Further, each movable protective fence 1 is configured so that it can be moved from its installation place in case of emergency.

Specifically, the movable protection fence 1 includes a plurality of base plates 2, a plurality of columns 4, a plurality of insertion tubes 6, a plurality of beams 8, a plurality of beam connecting members 9, and a plurality of casters 10. I have it.

The plurality of base plates 2 serve as a base of the movable protective fence 1. Each base plate 2 has a flat plate shape that is arranged substantially horizontally, and is arranged along the ground G at a position separated from the ground G upward.

The plurality of columns 4 support the beam 8 via the beam connecting member 9. Each of the plurality of columns 4 penetrates the corresponding base plate 2 and is erected and fixed to the base plate 2 in a posture of extending upward from the base plate 2. Each column 4 has a hollow cylindrical shape.

Each of the plurality of insertion tubes 6 is inserted into the corresponding support column 4 so as to be relatively movable in the axial direction (vertical direction) of the support column 4. When the movable protection fence 1 is installed at the installation location, the insertion tube 6 is arranged so as to straddle the space inside the fixed tube 100 and the space inside the support column 4 embedded in the ground at the installation location. The fixed pipe 100 and the support column 4 are connected to each other, whereby the movable protective fence 1 is fixed at its installation location. Further, when the movable protective fence 1 is moved from its installation place, the insertion tube 6 is pulled out upward from the space inside the fixed tube 100, and the connection between the fixed tube 100 and the column 4 by the insertion tube 6 is released. As a result, the movable protective fence 1 can be moved from the installation location.

Each of the plurality of beams 8 has a corrugated plate shape and extends along the longitudinal direction of the movable protective fence 1 (the direction in which the movable protective fence 1 extends). Each beam 8 is arranged so as to extend along the road when the movable guard fence 1 is installed at its installation location. The beam 8 constitutes one side surface and the other side surface of the movable protective fence 1 in the horizontal direction orthogonal to the longitudinal direction of the movable protective fence 1, and in the horizontal direction orthogonal to the longitudinal direction of the movable protective fence 1. They are arranged on one side and on the opposite side of the base plate 2 and the pillar 4 (see FIG. 2). The beam 8 arranged on one side of the base plate 2 and the support column 4 and the beam 8 arranged on the opposite side of the base plate 2 and the support column 4 are arranged on one side of the central divider with the movable protective fence 1 installed on the central divider. Facing the road in the opposite lane and the road in the opposite lane.

As shown in FIG. 2, the plurality of beam connecting members 9 connect the beams 8 arranged on one side and the opposite side with respect to the base plate 2 and the column 4. Specifically, the plurality of beam connecting members 9 are arranged in the longitudinal direction of the beam 8 between the beam 8 arranged on one side and the beam 8 arranged on the opposite side with respect to the base plate 2 and the column 4. Each extends in the horizontal direction orthogonal to each other. Then, both ends in the longitudinal direction of each beam connecting member 9 are coupled to the corresponding beam 8, respectively, so that each beam connecting member 9 is provided on one side and the opposite side with respect to the base plate 2 and the column 4. The arranged beams 8 are connected to each other. In addition, as shown in FIG. 1, the beam connecting members 9 are arranged at positions near both ends in the longitudinal direction of the beam 8 and at positions close to the columns 4, respectively. The beam connecting member 9 arranged at a position close to each of the columns 4 is coupled to the column 4. As a result, the columns 4 and the beams 8 are connected to each other via the beam connecting members 9 connected to the columns 4.

The plurality of casters 10 enables the movable protective fence 1 to move on the ground G and change direction freely. Each caster 10 is configured to be movable on the ground G along the ground G. Each caster 10 is attached to the base plate 2 so as to project downward from the base plate 2. In the present embodiment, four casters 10 are attached to one base plate 2, and the four casters 10 are arranged in four directions centered on the position of the column 4. Each caster 10 has a mounting shaft 12 (see FIG. 3 ), a bearing device 14 (see FIG. 5 ), a cover 16, a caster body 18, and a frame cover 20.

The attachment shaft 12 is a portion of the caster 10 that is attached (fixed) to the base plate 2, penetrates the base plate 2 in the vertical direction, and extends downward from the base plate 2. The axis of the mounting shaft 12 extends in the vertical direction (vertical direction). The mounting shaft 12 includes a shaft member 22, a nut 24, and a washer 25.

The shaft member 22 extends in the vertical direction. As shown in FIG. 5, the shaft member 22 has a bolt shaft portion 26, a hexagonal bolt head portion 28, a bearing device mounting portion 30, and a retaining portion 32. The bolt shaft portion 26, the bolt head portion 28, the bearing device mounting portion 30, and the retaining portion 32 are coaxially arranged and integrally formed.

The bolt shaft portion 26 vertically penetrates the base plate 2. The bolt shaft portion 26 has a screw groove formed on the outer peripheral surface thereof.

The bolt head portion 28 is provided at the lower end of the bolt shaft portion 26 and is arranged below the base plate 2.

The bearing device mounting portion 30 is a part to which the bearing device 14 is mounted. The bearing device mounting portion 30 has a columnar shape and extends downward from the bolt head portion 28.

The retaining portion 32 is provided at the lower end of the bearing device attaching portion 30 and is a portion for preventing the bearing device 14 attached to the bearing device attaching portion 30 from falling off. The retaining portion 32 has a shape that extends from the lower end of the bearing device mounting portion 30 to the outside in the radial direction of the bearing device mounting portion 30.

The nut 24 is screwed into a portion of the bolt shaft portion 26 that protrudes upward from the base plate 2. The washer 25 is sandwiched between the nut 24 and the upper surface of the base plate 2 while being fitted onto the bolt shaft portion 26. The nut 24 is fastened to the side of the base plate 2 via the washer 25, and the shaft member 22 is fastened to the base plate 2 so that the base plate 2 is sandwiched between the nut 24 and the bolt head 28.

The bearing device 14 includes a shaft member 22 of the mounting shaft 12 and a wheel supporting portion 54 so as to allow a wheel supporting portion 54 (described later) of the caster body 18 to rotate about the shaft center of the mounting shaft 12. It is interposed between and. As shown in FIG. 5, the bearing device 14 has an inner ring member 34, an outer ring member 36, and a plurality of balls 37.

The inner ring member 34 is fixed to the bearing device mounting portion 30 of the shaft member 22 of the mounting shaft 12 so as to be coaxial with the mounting shaft 12. Specifically, the inner ring member 34 has a cylindrical shape, and the bearing device mounting portion 30 is press-fitted into the inner ring member 34 so as to be externally fitted and fixed to the bearing device mounting portion 30. When the bearing device mounting portion 30 is press-fitted into the inner ring member 34, the bearing device mounting portion 30 is press-fitted into the inner ring member 34 from the slip-out preventing portion 32 of the shaft member 22, and the slip-out preventing portion 32 passes through the inside of the inner ring member 34. The device mounting portion 30 is press-fitted inside the inner ring member 34. The inner ring member 34 is arranged coaxially with the bearing device mounting portion 30, that is, coaxially with the shaft member 22.

The outer ring member 36 is arranged coaxially with the inner ring member 34 and radially outside the inner ring member 34 so as to surround the inner ring member 34, and rotates with respect to the inner ring member 34 about the axis of the mounting shaft 12. It is possible to install. The outer ring member 36 has an outer ring member main body 38 and a receiving cover 42.

The outer ring member main body 38 has a cylindrical shape having an inner diameter larger than the outer diameter of the inner ring member 34, and is arranged radially outside the inner ring member 34 so as to surround the inner ring member 34. A plurality of balls 37 are arranged between the outer ring member main body 38 and the inner ring member 34 so as to be lined up in the circumferential direction of the outer ring member main body 38 and the inner ring member 34, and the plurality of balls 37 are arranged between the outer ring member main body 38 and the inner ring member 34. It is held between 34 and. The outer ring member main body 38, the inner ring member 34, and the plurality of balls 37 form a ball bearing.

The receiving cover 42 covers a region from the lower surface of the inner ring member 34 and the outer ring member main body 38 to the outer peripheral surface of the outer ring member main body 38, and thereby the space between the inner ring member 34 and the outer ring member main body 38 from the lower side. It prevents foreign matter such as dust from entering. The receiving cover 42 is fitted so as to come into close contact with the outer ring member main body 38, and is integrated with the outer ring member main body 38 so as to align the shaft center of the mounting shaft 12 with respect to the mounting shaft 12 and the inner ring member 34. It is designed to rotate around the center. Further, the receiving cover 42 has a crimp portion 42a that is crimped to a peripheral edge portion 62b of a caster frame 58, which will be described later, of the wheel support portion 54 of the caster body 18. The crimping portion 42a extends from a portion of the receiving cover 42 that covers the outer peripheral surface of the outer ring member main body 38 so as to project above the upper end of the outer ring member main body 38, and from the outer side in the radial direction of the outer ring member main body 38 to the lower side. It has a shape folded back.

The cover 16 is placed on the bearing device 14 so as to cover the bearing device 14 from above, thereby preventing foreign matter such as dust from entering the space between the inner ring member 34 and the outer ring member body 38 from above. I'm out. In the center of the cover 16, there is provided a through hole into which the bearing device mounting portion 30 of the shaft member 22 is inserted. With the bearing device mounting portion 30 inserted in the through hole, the cover 16 is sandwiched between the lower surface of the bolt head 28 of the shaft member 22 and the upper surface of the inner ring member 34, whereby the shaft member 22 and It is fixed to the inner ring member 34. Further, the cover 16 is in contact with the upper surface of the crimp portion 42a of the receiving cover 42, but allows the outer ring member 36 to rotate about the axis of the mounting shaft 12. That is, the outer ring member 36 rotates with respect to the mounting shaft 12, the inner ring member 34, and the covering cover 16 about the axis of the mounting shaft 12 while the crimping portion 42 a of the receiving cover 42 is in sliding contact with the covering cover 16. It is like this.

As shown in FIG. 3, the caster body 18 has wheels 52 and wheel support portions 54, and is configured to be rollable on the ground G by the wheels 52. Further, the caster body 18 is connected to the mounting shaft 12 via the bearing device 14 so that the caster body 18 can be swiveled with respect to the mounting shaft 12 about the shaft center of the mounting shaft 12, whereby the ground G It is possible to roll in any direction along.

The wheel 52 is made of a metal disc and has a through hole 52a (see FIG. 4) in the center thereof. The wheel 52 contacts the ground G in a posture in which its axis extends in the horizontal direction, in other words, a posture in which the axis extends in a direction orthogonal to the axis of the mounting shaft 12, and rotates about the axis. To roll on the ground G.

The wheel support portion 54 supports the wheel 52 so that the wheel 52 can rotate around its axis (horizontal axis). As shown in FIG. 4, the wheel support portion 54 has an axle 56, a caster frame 58, and a nut 59.

The axle 56 is a portion that penetrates and supports the wheel 52 so that the wheel 52 can rotate. The axle 56 includes a shaft portion 56a that is inserted into the through hole 52a of the wheel 52, a bolt head 56b provided at one longitudinal end of the shaft portion 56a, and an end of the shaft portion 56a opposite to the bolt head 56b. And a screw portion 56c formed on the portion (tip portion). The screw portion 56c is an example of the protruding portion in the present invention. The wheel 52 is supported by the shaft portion 56a and is configured to rotate around the shaft portion 56a.

As shown in FIG. 4, the caster frame 58 is arranged so as to surround both sides of the wheel 52 in the axial direction and the upper side of the wheel 52, and holds the axle 56 so that the axle 56 extends in the horizontal direction. ing. The caster frame 58 is an example of the axle holding portion in the present invention. The caster frame 58 has a pair of side wall portions 60 and 61 arranged on both sides of the wheel 52 in a direction along the axial direction of the wheel 52, and a top wall portion 62 located above the wheel 52.

Each of the pair of side wall portions 60 and 61 is positioned around and below the mounting shaft 12, and is curved so as to bulge outward in the direction along the axial direction of the wheel 52, and the curved portion 60a. , 61a, and flat plate-shaped extending portions 60b and 61b extending to one side in a direction orthogonal to both the axial direction of the mounting shaft 12 and the axial direction of the wheel 52. Through holes are provided in the vicinity of the lower ends of the extending parts 60b and 61b so as to pass through these parts in the horizontal direction, and the shaft part 56a of the axle 56 is inserted into the through holes. In this state, the bolt head 56b of the axle shaft 56 is arranged outside the extending portion 60b of the one side wall portion 60, and the screw portion 56c of the axle shaft 56 projects outward from the extending portion 61b of the other side wall portion 61. .. That is, the screw portion 56c penetrates the extending portion 61b of the side wall portion 61 and projects outward. Then, the nut 59 is screwed onto the screw portion 56c outside the extending portion 61b of the other side wall portion 61, and the extending portion 60b of the pair of side wall portions 60, 61 is formed by the nut 59 and the bolt head 56b. The axle shaft 56 is fixed to the pair of side wall portions 60 and 61 so that the shaft portion 56a does not come out of the through hole of 61b.

The top wall portion 62 is arranged so as to be orthogonal to the axis of the mounting shaft 12, that is, horizontally. The top wall portion 62 is provided with a fitting hole 62a penetrating the top wall portion 62 in the vertical direction, and the top wall portion 62 has a peripheral edge portion 62b of the fitting hole 62a. The outer ring member 36 of the bearing device 14 is fitted into the fitting hole 62a of the top wall portion 62, and the peripheral edge portion 62b of the top wall portion 62 surrounds the outer ring member 36 and the crimp portion of the receiving cover 42 of the outer ring member 36. It is crimped to 42a. Specifically, the peripheral portion 62b has a taper shape that is directed upward as it goes radially inward of the fitting hole 62a. The peripheral portion 62b is inserted inside the folded crimp portion 42a of the receiving cover 42, and the crimp portion 42a is crimped with the peripheral portion 62b sandwiched from the inside and outside, whereby the peripheral portion 62b and the crimp portion 42a are separated from each other. Is crimped.

The frame cover 20 covers the upper end of the caster frame 58 and the cover 16 and covers the upper end of the caster frame 58 and the cover 16 from above. The frame cover 20 is provided with a hexagonal through hole 20a corresponding to the shape of the bolt head 28 of the shaft member 22. The frame cover 20 covers the upper end portion of the caster frame 58 and the cover 16 with the bolt head 28 of the shaft member 22 inserted through the through hole 20 a. The frame cover 20 is prevented from rotating around the shaft center of the shaft member 22 with respect to the bolt head 28 by fitting the hexagonal through hole 20 a and the hexagonal bolt head 28.

The movable guard fence 1 according to the present embodiment prevents the caster body 18 of each caster 10 from scattering from the mounting shaft 12 by the force acting on each caster 10 when the vehicle collides with the movable guard fence 1. In addition, a plurality of scattering prevention members 63 are provided.

The scattering prevention member 63 is attached to each caster 10. The scattering prevention member 63 allows the wheel support portion 54 to pivot with respect to the mounting shaft 12 and the inner ring member 34 together with the outer ring member 36, while suppressing the scattering of the caster body 18 from the mounting shaft 12. The wheel support portion 54 and the mounting shaft 12 are connected to each other.

Specifically, the scattering prevention member 63 is fixed to the wheel support portion 54 of the caster body 18 and is rotatably attached to the mounting shaft 12 about the axis of the mounting shaft 12. The scattering prevention member 63 has a mounting shaft mounting portion 64, a wheel support portion mounting portion 66, and an intermediate coupling portion 68 which are formed of a single metal plate.

The mounting shaft mounting portion 64 is a portion mounted on the mounting shaft 12. The mounting shaft mounting portion 64 has a flat plate shape that is disposed substantially horizontally, and has a circular insertion hole 64a (see FIG. 9) that penetrates the mounting shaft mounting portion 64 in the plate thickness direction (vertical direction) thereof. As shown in FIGS. 5 and 6, the bolt head 28 of the shaft member 22 of the mounting shaft 12 is inserted into the insertion hole 64a, and the mounting shaft mounting portion 64 is the bolt of the mounting shaft 12 inserted into the insertion hole 64a. It is mounted on the mounting shaft 12 by surrounding the head 28. The inner diameter of the insertion hole 64a is set to such a size that a gap is formed between the entire inner peripheral surface of the insertion hole 64a and the outer surface of the bolt head 28 inserted into the insertion hole 64a. ing. Accordingly, the mounting shaft mounting portion 64 is mounted so as to be rotatable with respect to the bolt head portion 28 of the mounting shaft 12 about the shaft center of the mounting shaft 12.

The wheel support attachment portion 66 is a portion that is attached to the wheel support portion 54, and is specifically attached to the screw portion 56c of the axle 56 of the wheel support portion 54 and fixed to the screw portion 56c by the nut 59. It By fixing the wheel supporting portion mounting portion 66 to the screw portion 56c of the axle 56, the scattering suppressing member 63 is fixed to the wheel supporting portion 54. The wheel supporting portion mounting portion 66 has a flat plate shape arranged along the outer surface of the extending portion 61b of the other side wall portion 61 of the caster frame 58. The wheel supporting portion mounting portion 66 has an axle insertion hole 66a (see FIG. 7) that penetrates the wheel supporting portion mounting portion 66 in the plate thickness direction (horizontal direction) thereof. The screw portion 56c of the axle 56 is inserted into the axle insertion hole 66a, and in this state, the wheel support attachment portion 66 has the nut 59 screwed into the screw portion 56c and the extension portion 61b of the other side wall portion 61. It is fixed to the axle 56 of the wheel support portion 54 by being sandwiched between them.

The intermediate connecting portion 68 is a portion that connects the mounting shaft mounting portion 64 and the wheel supporting portion mounting portion 66 to each other. The intermediate connecting portion 68 has an upper horizontal portion 68a, a hanging portion 68b, and a lower horizontal portion 68b.

The upper horizontal portion 68a is located outside the extension portion 61b of the other side wall portion 61 in the direction along the axial direction of the wheel 52 of the mounting shaft attachment portion 64, and the extension portion 61b is the curved portion. It has a flat plate shape that horizontally protrudes so as to be continuous from the end portion facing the side extended from 61a.

The hanging portion 68b extends downward from an outer edge of the upper horizontal portion 68a in a direction along the axial direction of the wheel 52, and has a slender flat plate shape arranged so as to be orthogonal to the axial direction of the wheel 52. There is. The hanging portion 68b is arranged perpendicular to the mounting shaft mounting portion 64 and the upper horizontal portion 68a.

The lower horizontal portion 68b extends horizontally from the lower end of the hanging portion 68b toward the extending portion 61b of the other side wall portion 61, and is connected to the upper end of the wheel support attaching portion 66. The lower horizontal portion 68b is arranged vertically to the hanging portion 68b.

The curved portion 61a of the caster frame 58 is located immediately below the mounting shaft mounting portion 64 and bulges outward in the axial direction of the wheel 52 from the extending portion 61b of the caster frame 58, and the axle 56 is mounted on the mounting shaft. The caster frame 58 is arranged at a position apart from the mounting shaft 12 in the horizontal direction orthogonal to the axial center of the 12, but the intermediate connecting portion 68 of the scattering suppressing member 63 is configured as described above. While avoiding the interference of the intermediate connecting portion 68 with the curved portion 61a, the mounting shaft 12 and the screw portion 56c of the axle 56 arranged as described above can be connected by the scattering inhibiting member 63. ..

When the vehicle collides with the movable protective fence 1 and the peripheral edge portion 62b of the caster frame 58 of the wheel support portion 54 and the crimp portion 42a of the receiving cover 42 of the outer ring member 36 are released from each other, the caster body 18 is detached from the mounting shaft 12. In this case, the kinetic energy of the caster body 18 is reduced by plastically deforming the intermediate connecting portion 68 of the scattering restraint member 63, and the scattering restraint member 63 connects the caster body 18 to the mounting shaft 12 so that the caster body 18 is held. Is prevented from scattering. Further, when the caster body 18 is disengaged from the mounting shaft 12 with a very strong force, the intermediate connecting portion 68 may be broken, but even in such a case, the scattering suppressing member 63 is Since the caster main body 18 is held until the connecting portion 68 is broken, the scattering distance of the caster main body 18 is reduced.

In the movable protective fence 1 according to the present embodiment, as described above, the scattering suppressing member 63 causes the wheel support portion 54 of the caster body 18 to swivel with the outer ring member 36 of the bearing device 14 with respect to the mounting shaft 12 and the inner ring member 34. Since the wheel support portion 54 and the mounting shaft 12 are connected so as to prevent the caster main body 18 from scattering from the mounting shaft 12, the movable guard fence 1 can be freely moved by the caster 10 along the ground G. It is possible to prevent the caster body 18 from largely scattering when the vehicle collides with the movable protective fence 1 while maintaining the function of being able to change the direction.

Specifically, when the vehicle collides with the movable protective fence 1, the vehicle collides with the beam 8, and the collision vehicle travels from the beam 8 to the column 4 via the beam connecting member 9 on the column 4. The external force acts to lean toward the lane opposite to the opposite lane. If the external force is large to some extent, the insertion pipe 6 inserted across the support 4 and the fixed pipe 100 opposes each other so that the support 4 can withstand without tilting. However, if the external force is too large, The column 4 tilts, and the base plate 2 and the mounting shaft 12 and the bearing device 14 of the caster 10 mounted on the base plate 2 also tilt. As a result, the crimping between the crimping portion 42a of the receiving cover 42 of the outer ring member 36 and the peripheral portion 62b of the caster frame 58 is released. The behavior at this time is shown in FIGS. 10 and 11, the frame cover 20 and the scattering prevention member 63 are not shown in order to clearly show the behavior in which the crimp portion 42a and the peripheral portion 62b are released from the crimp. The behavior will be specifically described below.

When the vehicle collides with the movable protective fence 1, an external force in the F direction shown in FIG. 10 acts, and if the external force is too large as described above, the support column 4 tilts and the base plate as shown in FIG. 2. The mounting shaft 12 and the bearing device 14 are integrally tilted. At this time, the cover 16 is deformed so that the collision vehicle side portion 16a of the cover cover 16 is lifted up, and the collision vehicle side portion 62c of the peripheral edge portion 62b of the caster frame 58 is deformed and pressed. It is pulled out from the portion 42a and the crimp is released.

After that, the external force causes the base plate 2, the mounting shaft 12, and the bearing device 14 to incline as shown in FIG. 11, and the portion of the bearing device 14 on the collision vehicle side is fitted into the fitting hole 62a of the top wall portion 62 of the caster frame 58. Leave from. After that, when the inclination of the base plate 2 further progresses due to the external force, the entire bearing device 14 separates from the caster frame 58, and as a result, the caster body 18 completely separates from the mounting shaft 12 and the bearing device 14.

At this time, if the caster body 18 and the mounting shaft 12 are not connected by the scattering restraint member 63, the caster body 18 compressed between the inclined base plate 2 and the ground G is repelled by the compression force and scattered. To do. Specifically, when the movable guard fence 1 is installed at the installation location, the caster body 18 is usually arranged so that the wheels 52 face the longitudinal direction of the movable guard fence 1, but the caster body 18 is inclined to the inclined base plate 2. When the caster main body 18 is sandwiched between the ground G and the ground G, the caster main body 18 is pressed between the base plate 2 and the ground G, and a force is exerted on the caster main body 18 such that the wheels 52 are laid sideways. To do. As a result, the caster body 18 scatters toward the side where the distance between the base plate 2 and the ground G is large, that is, toward the road side on which the collision vehicle is traveling.

On the other hand, in the present embodiment, when the vehicle collides with the movable protective fence 1, the peripheral force 62b of the caster frame 58 of the wheel support 54 is pressed against the outer ring member 36 of the bearing device 14 by the external force acting on the caster 10. Even if the caster body 18 comes off and detaches from the mounting shaft 12 and the bearing device 14, the scattering prevention member 63 connects the wheel support portion 54 of the caster body 18 and the mounting shaft 12 mounted to the base plate 2. Therefore, it is possible to prevent the caster body 18 from largely scattering from the mounting shaft 12 and the bearing device 14.

Further, if only the caster main body 18 is prevented from scattering, for example, the wheel support portion 54 can be secured by welding the caster frame 58 of the wheel support portion 54 to the base plate 2 or fastening it with bolts and nuts. It is also conceivable to fix the wheel support portion 54 to the base plate 2 so that the wheel support portion 54 is not separated from the base plate 2 by an external force that acts when the vehicle collides. However, in this case, the caster main body 18 cannot turn, so that the function of the movable protective fence 1 being able to freely change the direction along the ground G is lost. On the other hand, in the present embodiment, the mounting shaft mounting portion 64 of the scattering prevention member 63 is mounted so as to be rotatable with respect to the shaft member 22 of the mounting shaft 12 about the shaft center of the mounting shaft 12. Thus, the scattering prevention member 63 that connects the wheel support portion 54 and the mounting shaft 12 allows the wheel support portion 54 to pivot with respect to the mounting shaft 12 and the inner ring member 34 together with the outer ring member 36 of the bearing device 14. Therefore, the function of the caster 10 that the caster body 18 can swivel can be maintained. Therefore, the function that the movable protection fence 1 can freely change the direction along the ground G can be maintained.

Further, in the present embodiment, the mounting shaft mounting portion 64 of the scattering prevention member 63 is attached to the mounting shaft 12 by surrounding the mounting shaft 12 inserted into the insertion hole 64 a provided in the mounting shaft mounting portion 64. It is installed. For this reason, even if a large force is applied to the scattering suppressing member 63 when the scattering suppressing member 63 suppresses the scattering of the caster body 18, the mounting shaft mounting portion 64 can be prevented from coming off the mounting shaft 12.

In addition, in the present embodiment, the mounting shaft mounting portion 64, the wheel supporting portion mounting portion 66, and the intermediate connecting portion 68 of the scattering suppressing member 63 formed of a single metal plate are used to mount the mounting shaft 12 and the wheel supporting portion of the caster body 18. 54 are connected to each other, the wheel support portion 54 of the caster body 18 can be made more flexible than when the mounting shaft 12 and the wheel support portion 54 of the caster body 18 are connected to each other by, for example, a flexible cord. It can be firmly connected to the mounting shaft 12. Therefore, the caster body 18 can be more reliably prevented from scattering.

Further, when the attachment shaft 12 and the wheel support portion 54 are connected by the cord, the cord is wound around the caster body 18 while the caster body 18 is rotating for many rounds, and the turning of the caster body 18 is hindered. However, in the present embodiment, the mounting shaft mounting portion 64, the wheel support portion mounting portion 66, and the intermediate connecting portion 68 of the scattering restraint member 63 are formed of a single metal plate, and the scattering restraint is performed. Since the mounting shaft mounting portion 64 of the member 63 is mounted rotatably with respect to the mounting shaft 12 about the shaft center of the mounting shaft 12, when the caster body 18 swivels with respect to the mounting shaft 12, a scattering suppressing member. 63 rotates with respect to the mounting shaft 12 together with the caster body 18 without hindering the rotation of the caster body 18. Therefore, in the present embodiment, even if the caster body 18 turns for many rounds, the turning of the caster body 18 is not hindered by the scattering inhibiting member 63.

Further, in the present embodiment, the axle 56 has the screw portion 56c which penetrates the extending portion 61b of the side wall portion 61 of the caster frame 58 and projects outward, and the wheel support attaching portion 66 of the scattering restraining member 63 is It is attached to the screw portion 56c of the axle 56. Therefore, in the present embodiment, the wheel support portion mounting portion 66 of the scattering prevention member 63 can be attached to the wheel support portion 54 of the caster 10 by utilizing the axle shaft 56. Therefore, the structure of the caster 10 is prevented from becoming complicated as compared with the case where a portion for mounting the wheel supporting portion mounting portion 66 of the scattering prevention member 63 is separately provided on the caster frame 58 of the wheel supporting portion 54. it can.

The movable guard fence according to the present invention is not necessarily limited to the one having the above-mentioned configuration. For example, the movable guard fence according to the present invention may have the following configurations.

The scattering suppressing member is not necessarily limited to the one in which the mounting shaft mounting portion, the wheel supporting portion mounting portion, and the intermediate connecting portion are formed of a single metal plate. For example, as in the modified example shown in FIG. 12, the scattering prevention member 63 has a mounting shaft mounting portion 74, a wheel support portion mounting portion 76, and an intermediate connecting portion 78 which are separately configured, and the intermediate connecting portion 78. Connects the mounting shaft mounting portion 74 and the wheel supporting portion mounting portion 76, and the wheel supporting portion mounting portion 76 fixed to the wheel supporting portion 54 with respect to the mounting shaft mounting portion 74 fixed to the mounting shaft 12. It may have flexibility and slack so as to allow the swiveling.

Specifically, in this modified example, the mounting shaft mounting portion 74 is formed by bending a metal plate, and is fixed to the mounting shaft 12 with a flat plate-shaped fixed portion 74a and the fixed portion 74a. And a flat wire member attachment portion 74b bent and raised from the fixed portion 74a so as to be vertical.

The fixed portion 74a has a through hole (not shown) through which the shaft portion 26 of the shaft member 22 is inserted, and the upper surface of the base plate 2 and the washer 25 are inserted with the shaft portion 26 of the shaft member 22 inserted therethrough. It is fixed to the shaft member 22 by being sandwiched between and and tightened by the nut 24.

The wire member attachment portion 74b is a portion to which the wire member 80 of the intermediate coupling portion 78 is attached. The wire member mounting portion 74b has a mounting hole 74c (see FIG. 13) penetrating the wire member mounting portion 74b, and one end portion of the wire member 80 is connected to the wire member mounting portion 74b using the mounting hole 74c. Is attached to. Further, the wire member mounting portion 74b has a hook portion locking hole 74d (see FIG. 13) penetrating the wire member mounting portion 74b.

The wheel supporting portion mounting portion 76 is formed by bending a metal plate, and is a plate-shaped fixed portion 76a fixed to the wheel supporting portion 54 of the caster body 18, and is perpendicular to the fixed portion 76a. So that the connection fitting connection portion 76b is bent and raised from the fixed portion 76a.

The fixed portion 76a has an unillustrated axle insertion hole through which the screw portion 56c of the axle 56 is inserted, and in the state where the screw portion 56c is inserted into the axle insertion hole, the wheel support attachment portion of the above embodiment is provided. It is fixed to the screw portion 56c of the axle 56 in the same manner as 66.

The connection fitting connecting portion 76b is a portion of the intermediate connecting portion 78 to which a connection fitting 82 described later is connected. The connection fitting connection part 76b has a connection hole 76c (see FIG. 13) penetrating the connection fitting connection part 76b.

The intermediate connecting portion 78 is a wire member 80 whose one end is connected to the wire member mounting portion 74 b of the mounting shaft mounting portion 74, and a connection fitting of the wheel supporting portion mounting portion 76 which is mounted on the other end of the wire member 80. And a connecting fitting 82 connected to the connecting portion 76b.

The wire member 80 is made of a flexible wire, and one end of the wire member 80 is connected to the wire member mounting portion 74b by forming a ring shape through the mounting hole 74c of the wire member mounting portion 74b. Further, the wire member 80 has such a length as to cause slack when the intermediate connecting portion 78 connects the mounting shaft mounting portion 74 and the wheel supporting portion mounting portion 76, and the slack of the wire member 80. The caster body 18 is rotatable with respect to the mounting shaft 12 within the range.

The connecting fitting 82 is a wire member connecting portion that is connected to a hook portion 82a that is a portion connected to the connecting fitting connecting portion 76b of the wheel support attaching portion 76 and an end portion of the wire member 80 opposite to the one end portion. 82b.

The hook portion 82a is connected to the connecting fitting connecting portion 76b by being hooked on the connecting fitting connecting portion 76b through the connecting hole 76c. The hook portion 82a is attachable to and detachable from the connecting fitting connecting portion 76b. The wire member connecting portion 82b is coupled to the hook portion 82a so as to be rotatable relative to the hook portion 82a. As a result, twisting of the wire member 80 is reduced.

In this modification, when the caster body 18 may turn beyond the range of slack of the wire member 80 when the movable protective fence 1 is moved along the ground G, the hook portion 82a is connected to the connecting metal fitting. By removing the caster body 18 from the portion 76b, the caster body 18 can freely rotate without being restricted by the extension of the wire member 80. In this case, the hook portion 82a removed from the connecting fitting connecting portion 76b can be hooked and held by the wire member attaching portion 74b through the hook engaging hole 74d, whereby the connecting fitting 82 and the wire can be moved when the movable protective fence 1 moves. The member 80 can be prevented from being dragged on the ground G and becoming an obstacle.

As another modified example, in a scattering suppressing member in which the mounting shaft mounting portion, the wheel support portion mounting portion, and the intermediate connecting portion are formed from a single metal plate, the hanging portion of the intermediate connecting portion has a plate width direction. May be configured to match the direction along the axial direction of the wheel. FIG. 14 shows a caster of a movable protective fence in which the scattering suppressing member according to such a modification is used.

In this modification, the hanging portion 68b of the intermediate connecting portion 68 of the scattering restraint member 63 extends downward from an edge (tip) in the horizontal direction orthogonal to the axial direction of the wheel 52 of the upper horizontal portion 68a, and the plate width direction thereof. Has an elongated flat plate shape that is arranged so as to be along the axial direction of the wheel 52. According to this modification, the rigidity of the scattering restraint member 63 in the scattering direction of the caster body 18 can be increased. Therefore, the effect of suppressing the caster body 18 from scattering can be enhanced.

Further, the wheel supporting portion mounting portion of the scattering prevention member is not necessarily limited to the one that is mounted on the wheel supporting portion of the caster body using the axle as in the above embodiment. For example, the wheel support attachment portion may be attached to an attachment portion that is separately provided at an arbitrary portion of the caster body different from the axle (for example, the side wall portion of the caster frame).

Further, in the scattering prevention member, the intermediate connecting portion and the wheel supporting portion mounting portion are arranged outside the side wall portion of the caster frame on the bolt head side of the axle, and the wheel supporting portion mounting portion has the side wall portion and the bolt head of the axle. It may be sandwiched between and fixed. Further, such a scattering suppressing member, the intermediate connecting portion and the wheel supporting portion mounting portion are arranged outside the side wall portion on the screw portion side of the axle of the caster frame, and the wheel supporting portion mounting portion is a screw between the side wall portion and the axle. Two scattering suppressing members, which are a scattering suppressing member which is sandwiched and fixed between a nut screwed to the portion, may be provided.

In addition, a common mounting shaft mounting portion mounted on the shaft member of the mounting shaft is common, and the one intermediate coupling portion is disposed and fixed from the mounting shaft mounting portion to the outside of the side wall portion on the screw portion side of the axle of the caster frame. It may include both the wheel supporting portion mounting portion, the other intermediate connecting portion arranged and fixed on the outer side of the side wall portion of the caster frame on the bolt head side of the axle, and the wheel supporting portion mounting portion.

1 Movable Guard Fence 2 Base Plate 4 Support 8 Beam 10 Castor 12 Mounting Shaft 14 Bearing Device 34 Inner Ring Member 36 Outer Ring Member 52 Wheel 54 Wheel Support 56 Axle 56c Screw Part (Projection)
58 caster frame (axle holding part)
62b Peripheral part 63 Scattering prevention member 64 Mounting shaft mounting part 64a Insertion hole 66 Wheel support mounting part 68 Intermediate connection part

Claims (4)

A movable protective fence installed at a predetermined location adjacent to the road and the road,
A beam arranged so as to extend along the road when the movable guard fence is installed at the predetermined place,
A base plate arranged along the ground at a position spaced upward from the ground,
A pillar that stands on the base plate and supports the beam,
A caster attached to the base plate so as to project downward from the base plate and configured to be movable along the ground;
The caster is a caster body having a wheel that contacts the ground and rolls, and a wheel support portion that supports the wheel so that the wheel can rotate about a horizontal axis; A mounting shaft extending downward, and a bearing interposed between the mounting shaft and the wheel support part such that the wheel support part can swivel with respect to the mounting shaft about an axis of the mounting shaft. And a device,
The bearing device includes an inner ring member fixed to the mounting shaft so as to be coaxial with the mounting shaft, and an inner ring member that is rotatable with respect to the inner ring member about an axis of the mounting shaft. An outer ring member attached,
The wheel support portion has a peripheral portion surrounding the outer ring member, and the wheel support portion is fixed to the outer ring member by crimping the peripheral portion with the outer ring member,
The movable protective fence allows the wheel support portion to pivot with respect to the mounting shaft and the inner ring member together with the outer ring member, and at the same time prevents the caster body from scattering from the mounting shaft. A movable protective fence further comprising a scattering prevention member that connects a support portion and the mounting shaft. The scattering prevention member has a mounting shaft mounting portion mounted on the mounting shaft, and the mounting shaft mounting portion has an insertion hole through which the mounting shaft is inserted, and is inserted into the insertion hole. The movable protective fence according to claim 1, which is mounted on the mounting shaft by surrounding the mounting shaft. The scattering prevention member further has a wheel supporting portion mounting portion mounted on the wheel supporting portion of the caster body, and an intermediate connecting portion connecting the mounting shaft mounting portion and the wheel supporting portion mounting portion,
The mounting shaft mounting portion, the wheel supporting portion mounting portion and the intermediate connecting portion are formed from a single metal plate,
The insertion hole penetrates the mounting shaft mounting portion in the plate thickness direction of the metal plate,
The movable protection fence according to claim 2, wherein the mounting shaft mounting portion is mounted so as to be rotatable with respect to the mounting shaft about an axis of the mounting shaft. The wheel support portion has an axle that penetrates and supports the wheel so that the wheel can rotate, and an axle holding portion that holds the axle so that the axle extends in a horizontal direction. ,
The axle holding portion has a pair of side wall portions arranged on both sides of the wheel in a direction along the axial direction of the wheel,
The axle has a protrusion that penetrates one side wall of the pair of side walls and protrudes outward.
The movable protection fence according to claim 3, wherein the wheel support attachment portion is attached to the protrusion of the axle.