JP2021004110A - Derailment/falling prevention device - Google Patents

Abstract

To provide a derailment/falling prevention device capable of preventing damaging of a machine or a facility while preventing derailment.SOLUTION: A derailment/falling prevention device 10 of a machine traveling by a wheel 3 comprises: a contact member 12 having a tip set on the lateral side of the traveling route of the wheel; and an absorption part 15 which absorbs a force applied to the contact member 12 along the rotational axis direction of the wheel 3. The movement of the machine can be limited by the contact member 12, and thus derailment of the wheel 3 from the traveling route can be prevented. Further, an impact force when the contact member 12 comes into contact with the traveling route can be absorbed by the absorption part 15, and thus damaging of the traveling route, the contact member 12, and the machine caused by the impact force can be prevented.SELECTED DRAWING: Figure 1

Description

The present invention relates to a derailment / fall prevention device.

Machines such as overhead cranes and portal cranes (rail traveling machines, non-rail traveling machines, etc., hereinafter simply referred to as machines) use wheels (iron wheels, urethane wheels, etc.) provided at the lower end of the machine to reach the ceiling or ground of warehouses, etc. It travels on rails and runway girders installed in. However, the wheels are only mounted on rails or the like, and if a force is applied to the machine along the width direction of the rails or the like due to an earthquake or the like, the wheels may come off.

In order to prevent such derailment, a lug is provided on the machine (for example, Patent Document 1 and the like). The lug is a member arranged so that one end is fixed to the machine and the other end is located on the side of the rail or the like, and usually, the lug is arranged so as to have a predetermined gap between the lug and the rail or the like. If such a lug is provided, when the machine moves in the width direction of the rail or the like, the lug comes into contact with the rail or the like and the machine cannot move any further, so that it is possible to prevent derailment or the machine from falling. it can.

Japanese Unexamined Patent Publication No. 11-023779

However, when the force of an earthquake is applied to the machine, the movement of the machine becomes irregular and it is difficult to control the movement. Although the movement of the machine can be restricted to some extent if the lug comes into contact with the rail or the like, it is difficult to sufficiently prevent the machine from falling or derailing.

Moreover, the impact generated when the rail or runway girder collides with the lug will be directly applied to the rail, runway or lug. The impact can then damage the rails, runways and lugs. In this case, even if the derailment of the machine can be prevented, if the rail or the like is damaged, the rail or the like needs to be repaired or replaced.
In addition, since the impact applied to the lug is applied to the machine through the lug, the machine itself may be damaged.

In view of such circumstances, an object of the present invention is to provide a derailment / fall prevention device capable of preventing damage to a machine or equipment while preventing derailment or fall of the machine.

The derailing / falling prevention device of the first invention is a derailing / falling prevention device for a machine traveling by wheels, and the tip of the derailing / falling prevention device is arranged on the side of the traveling path of the wheel. It is characterized by including a contact member and an absorbing portion that absorbs a force applied to the contact member along the rotation axis direction of the wheel.

According to the first invention, since the impact force when the contact member and the traveling route come into contact with each other can be absorbed by the absorbing portion, it is possible to prevent the wheels from coming off the traveling route and the machine from falling. Moreover, since the absorbing portion can absorb the impact force when the contact member and the traveling path come into contact with each other, it is possible to prevent damage to the traveling path, the contact member, and the machine due to the impact force.

(A) is a schematic front view of the overhead crane 1 provided with the fall prevention device 10 of the present embodiment, and (B) is a schematic sectional view taken along line BB of (A). (A) is a schematic cross-sectional view taken along the line IIA-IIA of FIG. 1, and (B) is a schematic cross-sectional view taken along the line BB of (A). It is explanatory drawing of the operation state of the fall prevention device 10 of this embodiment, (A) is a state in which contact member 12 and runway girder G are not in contact, and (B) is a contact member by movement of an overhead crane 1. 12 is in contact with the runway girder G. It is the schematic explanatory drawing of the fall prevention device 10B of another embodiment. It is a schematic front view of the overhead crane 1 provided with the fall prevention device 10 of this embodiment, and (B) is the schematic sectional view of line BB of (A). It is the schematic explanatory drawing of the fall prevention device 10C of another embodiment.

The derailing / falling prevention device of the present embodiment is attached to a machine traveling on a traveling route by wheels to prevent derailing of the wheels and falling of the machine, and a force is applied from the direction of the rotation axis of the wheels. It is characterized in that it is possible to prevent the wheels from coming off the traveling path and the machine from falling even in the case of such a case.

The machine provided with the derailment / fall prevention device of the present embodiment is not particularly limited as long as it is a machine that travels on the traveling path by wheels (iron wheels, urethane wheels, etc.). For example, an overhead crane, a gantry crane, a single gantry crane, and the like, which are machines that travel on a traveling path by wheels.

The traveling route on which the derailing / falling prevention device of the present embodiment travels is not particularly limited as long as it is a route on which the wheels may derail and the machine may fall. Examples of the traveling route include rails and runway girders.

In the following, as a representative, a case where the derailing / falling prevention device of the present embodiment is adopted for an overhead crane traveling on a runway girder will be described. Further, the structure of each part of the overhead traveling crane described below shows a general structure, and the structure of the overhead traveling crane that employs the derailing / falling prevention device of the present embodiment is not limited to the following structure.

Next, an embodiment of the present invention will be described with reference to the drawings.

<Ceiling crane 1>
In FIG. 1A, reference numeral G indicates a runway girder provided on the ceiling of a building such as a factory or a warehouse. Reference numeral 1 indicates an overhead crane provided between the pair of runway girders G and G. The overhead crane 1 is mounted on a pair of runway girders G and G via a traveling portion 2 (FIG. 1 (B)).

As shown in FIG. 1 (B), the traveling portion 2 of the overhead traveling crane 1 is provided with rotatably known wheels 3 such as a wheel with a brim and a wheel without a brim, and the wheel 3 is provided on the runway girder G. It is listed in.

Since the overhead crane 1 has the traveling portion 2 as described above, if the wheels 3 of the traveling portion 2 are rolled and moved on the runway girder G, the overhead crane 1 can be moved in the longitudinal direction of the runway girder G ( It can be moved along the left-right direction of FIG. 1B).

As shown in FIG. 5A, the overhead crane 1 may have wheels 3 traveling on the rail R. When traveling on the rail R, if a wheel with a brim is used as the wheel 3 in addition to the derailment / fall prevention device 10 of the present embodiment, the effect of preventing derailment and the fall of the machine can be enhanced.

<Derailment / fall prevention device 10 of this embodiment>
Now, the derailment / fall prevention device 10 of the present embodiment will be described.
As shown in FIG. 1 (B), the derailing / falling prevention device 10 of the present embodiment is provided at both ends of the traveling portion 2 of the overhead traveling crane 1. As shown in FIGS. 1 and 2, the derailing / falling prevention device 10 of the present embodiment applies a force applied to the main body case 11, the contact member 12, and the contact member along the rotation axis direction of the wheel 3. It includes an absorbing unit 15 for absorbing.

<Main body case 11>
As shown in FIG. 2, the main body case 11 is a hollow box-shaped structure, and is a member fixed to the traveling portion 2 of the overhead crane 1. That is, it is a member that is connected to the traveling portion 2 of the overhead crane 1 when the derailing / falling prevention device 10 of the present embodiment is installed in the traveling portion 2 of the overhead crane 1. The main body case 11 is provided with a contact member 12 and an absorbing portion 15 inside, and an opening 11a communicating with the outside is provided on the lower surface thereof. Therefore, the contact member 12 can be in a state in which the tip thereof protrudes outside the main body case 11 while being housed in the main body case 11.

The shape and size of the opening 11a of the main body case 11 are not particularly limited. When the main body case 11 is attached to the traveling portion 2 of the overhead crane 1, it is formed in a size that does not hinder the swing of the contact member 12 when the contact member 12 swings as described later. Good.

<Contact member 12>
As shown in FIG. 2, the contact member 12 is a rod-shaped or strip-shaped member that is long in the axial direction (vertical direction in FIG. 2A). The contact member 12 is provided in the main body case 11 so that its tip protrudes from the opening 11a of the main body case 11. Specifically, the contact member 12 is provided so that the tip of the contact member 12 is located on the side of the runway girder G or the like when the main body case 11 is attached to the traveling portion 2 of the overhead crane 1. The contact member 12 is attached to the main body case 11 in a state where the portion between the tip end portion and the base end portion is pivotally supported by the shaft 12p. More specifically, the contact member 12 is attached to the main body case 11 so that the tip thereof can swing along the rotation axis direction of the wheel 3 with the shaft 12p as a fulcrum. For example, in the case of FIG. 2A, when the main body case 11 moves to the right and the tip of the contact member 12 comes into contact with the runway girder G and moves to the left, the base end of the contact member 12 Is provided to move to the right.

<Absorbent 15>
As shown in FIG. 2, in the main body case 11, the absorbing portion 15 is provided on the side of the contact member 12 and above the shaft 12p. The absorbing portion 15 has a function of absorbing a force applied from the contact member 12 when the base end of the contact member 12 comes into contact with the absorbing portion 15. Further, the absorbing unit 15 also has a function of restoring the original state when the force applied from the contact member 12 is removed. For example, as shown in FIG. 2, a damper can be used as the absorbing unit 15.

As shown in FIG. 2, when a damper is used as the absorbing portion 15, the absorbing portion 15 is provided so that the expansion / contraction direction thereof is along the direction in which the base end of the contact member 12 swings. In other words, when the main body case 11 is attached to the traveling portion 2 of the overhead crane 1, the absorbing portion 15 is arranged so that the expansion / contraction direction of the absorbing portion 15 is parallel to the rotation axis direction of the wheels 3 (horizontal direction in FIG. 2). Will be installed.

When a damper is used as the absorbing portion 15, the absorbing portion 15 may be provided so that the expansion / contraction direction thereof is the vertical direction. In this case, since the length of the wheel 3 in the wheel removal / fall prevention device 10 in the rotation axis direction (width of the wheel removal / fall prevention device 10) can be shortened, the wheel removal / fall prevention device 10 can be miniaturized and the wheel can be removed. -The degree of freedom in the installation position of the fall prevention device 10 can be increased. In the case of such a configuration, when the base end of the contact member 12 swings, it is necessary to convert the movement of the base end (the direction of the rotation axis of the wheel 3) into the movement in the vertical direction and apply a force to the absorbing portion 15. There is. For example, a link mechanism provided with a pressing member between the base end of the contact member 12 and the absorbing portion 15 so as to come into contact with the absorbing portion 15 from above and below when the base end of the contact member 12 swings. The method of providing can be adopted. Further, the contact member 12 is provided with a portion (pressing portion) extending in a direction intersecting the axial direction (that is, the rotation axis direction of the wheel 3) so that the tip thereof is located above or below the absorbing portion 15. 12 may be arranged. Also in this case, when the base end of the contact member 12 swings, the pressing portion can be brought into contact with the absorbing portion 15 from above or below.

<Derailment / fall prevention device 10 of this embodiment>
Since the derailing / falling prevention device 10 of the present embodiment has the above structure, it functions as follows. In the following description, a case where a damper is used as the absorbing unit 15 will be described.

First, as shown in FIG. 3, it is assumed that the main body case 11 of the derailing / falling prevention device 10 of the present embodiment is attached to the traveling portion 2 of the overhead crane 1. Specifically, it is assumed that the tip of the contact member 12 is located on the left side of the runway girder G and is attached so as to have a slight gap. In this case, if the traveling portion 2 of the overhead crane 1 normally moves along the axial direction of the runway girder G (the direction orthogonal to the paper surface in FIG. 3), the contact member 12 and the runway girder G are not in contact with each other. , The overhead crane 1 moves.

On the other hand, when a force for moving the overhead crane 1 in the right direction (direction of arrow A) in FIG. 3 (B) is applied along the rotation axis direction of the wheels 3 due to an earthquake or the like, the tip of the contact member 12 is applied to the runway girder G. Contact. Then, the tip of the contact member 12 swings to the left with the shaft 12p as a fulcrum. On the other hand, the base end of the contact member 12 swings to the right with the shaft 12p as a fulcrum. Since the absorbing portion 15 is provided on the right side of the base end of the contact member 12, the base end of the contact member 12 comes into contact with the absorbing portion 15.

When the base end of the contact member 12 comes into contact with the absorption unit 15, the absorption unit 15 becomes a movement resistance of the base end of the contact member 12, so that the movement of the overhead crane 1 can be restricted to some extent. At this time, if the force for moving the overhead crane 1 is not so large, the movement of the overhead crane 1 can be stopped only by the resistance when the contact member 12 and the absorbing portion 15 come into contact with each other. Therefore, it is possible to prevent the wheels 3 of the overhead crane 1 from coming off the runway girder G.

On the other hand, when the force for moving the overhead crane 1 is large and the movement of the overhead crane 1 cannot be stopped only by the base end of the contact member 12 contacting the absorbing portion 15, the tip of the contact member 12 contacts the runway girder G. After that, the contact member 12 and the overhead crane 1 move further to the right. Then, the tip end portion of the contact member 12 further moves to the left side, and the base end portion of the contact member 12 further moves to the right direction, so that the force can be absorbed by the absorption portion 15 contracting. Therefore, the movement of the overhead crane 1 can be restricted, and the impact generated by the contact between the runway girder G and the tip of the contact member 12 can be reduced.

As described above, if the derailing / falling prevention device 10 of the present embodiment is provided, even if a force for moving the overhead crane 1 is applied along the rotation axis direction of the wheels 3, the wheels 3 of the overhead crane 1 can be moved. It is possible to prevent the wheel from coming off the runway girder G and the overhead crane 1 from falling.

Moreover, since the impact force when the runway girder G and the tip of the contact member 12 come into contact with each other can be absorbed by the absorbing unit 15, damage to the overhead crane 1 and the runway girder G due to the impact force can be prevented.

When the force for moving the overhead crane 1 is lost due to an earthquake or the like and the force applied from the contact member 12 is lost, the absorbing portion 15 returns to the original state. Therefore, when the impact force when the runway girder G and the tip of the contact member 12 come into contact with each other is small, the derailment / fall prevention device 10 of the present embodiment makes contact between the runway girder G and the tip of the contact member 12. It returns to the state before. Therefore, if the force for moving the overhead crane 1 due to an earthquake or the like is within a certain range, the overhead crane 1 can be used without repairing the derailing / falling prevention device 10 or the overhead crane 1 of the present embodiment. You can return to operation.

<About the contact member 12>
The position where the contact member 12 is pivotally supported by the shaft 12p is not particularly limited as long as the tip of the contact member 12 can swing along the rotation axis direction of the wheel 3. However, the shaft is at a position where the distance L1 from the position where the contact member 12 is connected (or contacted) to the absorbing portion 15 to the shaft 12p is longer than the distance L2 to the position where the contact member 12 comes into contact with the runway girder G. It is desirable that it is supported (see FIG. 3 (A)). If the contact member 12 is pivotally supported by the shaft 12p at such a position, the force applied to the absorbing portion 15 is smaller than the force applied to the contact member 12 from the runway girder G, and then the force applied to the contact member 12 It is also possible to use the absorption unit 15 having a small absorption capacity. Then, since the absorption unit 15 can be miniaturized, the derailing / falling prevention device 10 of the present embodiment can also be miniaturized.

<About absorption unit 15>
The absorbing unit 15 preferably has a function of absorbing a force applied to the contact member 12 and a function of restoring the original state when the force is removed, and various devices or the like are adopted. Can be done. For example, a general hydraulic damper or the like can be used.

Further, the absorption unit 15 is not only a general hydraulic damper or the like that generates a certain amount of reaction force for returning to the original state when the force is removed, but also deforms when a force is applied. However, even if the force is removed, a strong reaction force is not generated and a device that gradually returns to the original shape may be adopted.

Further, as the absorbing portion 15, one which is deformed when a force is applied but does not return to the original shape may be adopted.

Further, the absorbing portion 15 is not limited to one that contracts by an amount corresponding to the applied force when the base end of the contact member 12 comes into contact with the absorbing portion 15 (for example, a linear type damper), and a predetermined force is applied. It is possible to use a damper (for example, a bilinear type damper) which has a small amount of contraction and exhibits a function of greatly contracting and absorbing the force when a force exceeding a predetermined force is applied. In this case, when the force applied to the overhead crane 1 (in other words, to the absorbing unit 15) is smaller than the predetermined force, the derailing / falling prevention device 10 of the present embodiment is equivalent to the conventional lug. While the function can be exerted, when the force applied to the overhead crane 1 becomes larger than a predetermined force, the force can be absorbed by the absorbing unit 15. If such an absorption unit 15 is used, it becomes easier to prevent the overhead crane 1 from coming off or falling as compared with the case where the absorption unit 15 absorbs the force from a state in which the force applied to the overhead crane 1 is small.

<Other examples of derailment / fall prevention device 10>
In the derailment / fall prevention device 10 described above, the contact member 12 is configured to swing with the shaft 12p as a fulcrum, but the contact member 12 does not necessarily have to be configured to swing. For example, as shown in the figure on the right side of FIG. 4A, a guide shaft 13 parallel to the rotation axis direction of the wheel 3 is provided in the main body case 11, and the contact member 12 can move along the guide shaft 13. You may do so. In this case, an absorbing portion 15 is provided between the base end of the contact member 12 and the inner surface of the main body case 11 so as to absorb the force in the direction parallel to the guide shaft 13. In the case of such a structure, when the tip of the contact member 12 is moved in contact with the runway girder G, the base end of the contact member 12 moves along the guide shaft 13 in parallel with the rotation axis direction of the wheel 3 (FIG. 4 (FIG. 4). In A), it moves to the right). Then, since the force for contracting the absorption unit 15 is applied to the absorption unit 15 due to the movement, the force applied to the contact member 12 from the runway girder G, that is, the force applied to the overhead crane 1, can be absorbed by the absorption unit 15. Then, when the absorbing unit 15 has a restoring force, the contact member 12 can be returned to the original position when the force applied to the overhead crane 1 is removed.

Further, as shown in the figure on the left side of FIG. 4A, the contact member 12 may be fixed to the main body case 11 and an absorption portion 15 may be provided at the tip of the contact member 12. In this case, the absorbing unit 15 directly absorbs the force applied to the contact member 12 from the runway girder G. In the case of such a configuration, since a movable structure such as a configuration for swinging the contact member 12 or a configuration for moving the contact member 12 is not provided, the structure of the derailment / fall prevention device 10 can be further simplified. Can be done.

<Example of providing contact members 12 on both sides>
In the above example, the case where the derailing / falling prevention device 10 of the present embodiment has the contact member 12 in contact with one side of the runway girder G has been described. When the contact members 12 can be provided on both sides of the travel path of the rail R or the like, such as when the overhead crane 1 travels on the rail R provided on the runway girder G, the rail R or the like travels. The contact member 12 may be provided so as to sandwich the route from both sides. In this case, the derailing / falling prevention device 10 can absorb the force applied to the overhead crane 1 regardless of the direction in which the force for moving the overhead crane 1 is applied along the rotation axis direction of the wheels 3.

For example, as shown in FIG. 4B, two contact members 12 are provided symmetrically with respect to a plane parallel to the traveling direction of the overhead crane 1, and both rods are provided between the base ends of the two contact members 12. A damper is provided as an absorption unit 15. For example, both rod dampers provided so that both ends of one shaft protrude from both ends of the cylinder case are provided as absorption portions 15, and both ends of the shaft are in contact with the base ends of the two contact members 12. It is provided so as to be. In this case, the force applied to the overhead crane 1 can be absorbed by the absorbing unit 15 regardless of which direction the force is applied in the direction of the rotation axis of the wheel 3.

When the two contact members 12 are provided on both sides of the traveling path such as the rail R, both rod dampers as described above may be provided as the absorption unit 15, but the absorption corresponding to each contact member 12 may be provided. Each unit 15 may be provided. However, if both rod dampers are used as the absorption unit 15, the absorption unit 15 can be integrated into one, so that there is an advantage that the structure of the device can be simplified and miniaturized.

Further, when there is only one contact member 12, the force applied in one direction of the overhead crane 1 is absorbed by the derailing / falling prevention device 10 provided on one of the traveling portions 2. For example, in FIG. 1, when a force for moving the overhead crane 1 to the right is applied, the force applied to the overhead crane 1 is absorbed only by the derailing / falling prevention device 10 provided on the traveling portion 2 on the right side. However, when the derailing / falling prevention device 10 having the contact members 12 arranged so as to sandwich the rail R or the like from both sides is provided, the derailing / falling prevention device 10 provided on both the left and right traveling portions 2. Can absorb the force to move the overhead crane 1 to the right. On the contrary, the force for moving the overhead crane 1 to the left can also be absorbed by the derailing / falling prevention device 10 provided on both the left and right traveling portions 2. Then, since the performance of absorbing the force applied to the overhead crane 1 can be enhanced, it is possible to effectively prevent the derailment from the rail R or the like.

<About the installation of the derailment / fall prevention device 10 of this embodiment>
In the above example, the case where the derailing / falling prevention device 10 of the present embodiment is provided at both ends of the traveling portion 2 of the overhead crane 1 has been described. In this case, there is an advantage that the operator can easily inspect and repair the derailing / falling prevention device 10.

However, in the overhead crane 1, the place where the derailing / falling prevention device 10 of the present embodiment is installed is not particularly limited. When a force for moving the overhead crane 1 is applied along the rotation axis direction of the wheels 3, the contact portion 12 may be provided so as to come into contact with the runway girder R and absorb the impact. For example, it may be provided inward of the end of the traveling portion 2 of the overhead traveling crane 1, or may be provided in the middle of the traveling direction of the traveling portion 2. Further, the derailing / falling prevention device 10 of the present embodiment may be provided on a portion of the overhead crane 1 other than the traveling portion 2, for example, a girder of the overhead crane 1 (see FIG. 5B).

Further, in the above example, the case where the derailing / falling prevention device 10 of the present embodiment has the main body case 11 has been described, but the main body case 11 does not necessarily have to be provided. The contact portion 12 and the absorption portion 15 may be installed directly on the traveling portion 2 or the like of the overhead crane 1 (see FIG. 5B). However, as described above, if the main body case 11 is provided and the contact portion 12 and the absorption portion 15 are housed in the main body case 11, the main body case 11 can be simply attached to the traveling portion 2 or the like of the overhead crane 1. , The derailing / falling prevention device 10 of the present embodiment can be installed in the traveling portion 2 or the like of the overhead crane 1. That is, it becomes easy to install the derailing / falling prevention device 10 of the present embodiment on the traveling portion 2 and the like of the overhead crane 1. Moreover, when the derailment / fall prevention device 10 is damaged, the derailment / fall prevention device 10 can be removed together with the main body case 11 and a new derailment / fall prevention device 10 can be installed. Then, even if the derailment / fall prevention device 10 is damaged, the operation of the overhead crane 1 can be restored simply by replacing the derailment / fall prevention device 10. Moreover, since the derailment / fall prevention device 10 can be repaired and inspected by removing it from the overhead crane 1, the maintainability of the derailment / fall prevention device 10 can be improved.

<Another example of the derailing / falling prevention device 10 of the present embodiment>
Further, as the derailment / fall prevention device 10 of the present embodiment, the absorption unit 15 may be directly installed on the crane girder of the overhead crane 1 to be the derailment / fall prevention device 10 (see FIG. 6). In this case, the derailing / falling prevention device 10 of the present embodiment can be formed only by providing the absorbing portion 15 such as a damper on the existing crane girder such as an overhead crane. Then, the structure of the derailment / fall prevention device 10 of the present embodiment becomes simple, and the derailment / fall prevention device 10 of the present embodiment can be easily installed.

The derailing / falling prevention device of the present invention is suitable as a derailing / falling prevention device for machines traveling on rails and runway girders by wheels, for example, overhead cranes, portal cranes, and single-gate cranes.

1 Overhead crane 2 Traveling part 3 Wheel 10 Derailing / falling prevention device 11 Main body case 11a Opening 12 Contact member 12p Axis 13 Guide shaft 15 Absorbing part 16 Rug G Runway girder R rail

Claims (10)

It is a derailment / fall prevention device for machines that run on wheels.
The derailment / fall prevention device
A contact member whose tip is arranged on the side of the traveling path of the wheel,
A derailing / falling prevention device comprising an absorbing portion that absorbs a force applied to the contact member along the direction of the rotation axis of the wheel. The absorption part
The derailment according to claim 1, wherein when the force applied to the contact member is removed along the direction of the rotation axis of the wheel, the contact member has a function of returning to the original state. Fall prevention device. The contact member
The tip is attached to the machine so that it can move along the direction of rotation of the wheel.
The absorption part
The derailment / fall prevention device according to claim 1 or 2, wherein the contact member is arranged so as to limit the movement of the tip of the contact member along the rotation axis direction of the wheel. The contact member
The derailment / fall prevention device according to claim 3, wherein the tip is attached to the machine so that the tip can swing along the rotation axis direction of the wheel. The contact member
The derailment / fall prevention device according to claim 1, 2, 3 or 4, wherein the device is provided on both sides in the width direction of the traveling path. The derailing / falling prevention device according to claim 5, wherein the absorbing portion includes both rod dampers. The absorption part is provided with a damper.
The damper is
The derailment / fall prevention device according to any one of claims 1 to 6, wherein the expansion / contraction direction is provided parallel to the rotation axis direction of the wheel. The absorption part is provided with a damper.
The damper is
The derailment / fall prevention device according to any one of claims 1 to 6, wherein the expansion / contraction direction is provided in the vertical direction. The derailment / fall prevention device according to any one of claims 1 to 8, wherein the traveling path of the wheel is a rail. The derailment / fall prevention device
The derailment / fall prevention device according to any one of claims 1 to 9, wherein the device is provided at the end of the machine in the traveling direction.

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