KR101712518B1 - device for reducing collision of Forklift - Google Patents

Abstract

The present invention relates to a collision reducing device for a corner of a forklift and, specifically, to a collision reducing device for a corner of a forklift, which can reduce costs required for maintenance and can block damage to a forklift and a colliding body by absorbing impact in case the forklift absorbs the impact as the collision reducing device for a corner of a forklift is installed at a corner of a vehicle body in a forklift loading a heavy object and moving. According to the present invention, the collision reducing device for a corner of a forklift includes: a base unit connected to the corner of the vehicle body and having first, second, and third mounting surfaces facing different directions; a first direction energy absorbing unit connected to the first mounting surface and absorbing body for absorbing the impact in a lateral direction of the vehicle body; a multidirectional impact absorbing unit including a second direction energy absorbing unit absorbing the impact in a forward direction of the vehicle body by being connected to the second mounting surface and a third direction energy absorbing unit absorbing the impact in a corner direction of the vehicle body by being connected to the third mounting surface to be located between the first direction energy absorbing unit and the second direction energy absorbing unit; a connection band unit installed to enclose the first direction energy absorbing unit, the second direction energy absorbing unit, and the third direction energy absorbing unit; and a flexible guard unit transferring the impact to the connection band unit by being connected to one side of the connection band unit and protecting the colliding body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision mitigation device for a forklift,

More particularly, the present invention relates to a collision mitigating apparatus for a corner portion of a forklift, more particularly, to a collision mitigating apparatus for a corner portion of a forklift, which is installed at a corner of a body of a forklift, The present invention relates to a collision mitigating device for a corner portion of a forklift which can reduce maintenance costs.

BACKGROUND OF THE INVENTION [0002] In general, a heavy vehicle is a vehicle that loads or lifts a heavy heavy object. Such vehicles include transfer cars, forklifts, and the like.

A forklift is used to lift and lower a relatively heavy cargo or to transport it to a desired location within a relatively limited space. Therefore, the forklift has a relatively small body and is configured as a minimum component for use in a small space.

Generally, a forklift is composed of a vehicle body having an engine mounted therein, two front drive wheels disposed at a front lower portion of the vehicle body, and a rear steering wheel provided at a rear lower portion of the vehicle body. A carriage for loading objects is formed in front of the vehicle body. The carriage is provided with a mast that is adjusted at a predetermined angle and a pair of forks that are vertically movable in the mast and are adjustable in mutual spacing.

The forklift can be easily turned in the state where the object is loaded in a relatively small space by the rear steering wheel.

When a forklift is in operation, it collides with nearby objects due to the movement of the vehicle body due to a rotational motion such as a sudden change of direction. However, in the conventional forklift truck, since a sturdy body protrudes without a separate buffering means at the corner, when the article is moved in a narrow room by such a forklift, when the corner of the body collides against a building wall surface or other object, Or the safety of the operator.

Korean Utility Model Publication No. 20-1998-061780 discloses a rich type electric forklift having a shock absorber.

The damper assembly includes a damper assembly having a damper assembly, a damper assembly, a damper assembly, a damper assembly and a damper. The damper assembly includes a cylindrical damper rotatably fixed to the shaft hole of the damper assembly by a shaft bolt. A bushing is fitted to facilitate the rotation of the damper.

However, since the shock absorber absorbs shocks with only one cylindrical damper, the shock absorber has a low buffering effect, and the damper is installed in only one specified direction, which makes it difficult to absorb shocks applied in various directions.

Korean Utility Model Registration No. 20-1998-061780: Rich type electric forklift with shock absorber

It is an object of the present invention to provide a shock absorber having a plurality of impact energy absorbers at different corners of a body of a skid steerer to effectively protect a vehicle body from an impact applied in various directions, The present invention provides a collision mitigation apparatus for a corner portion of a forklift capable of minimizing the impact energy by dispersing the impact applied in the other direction.

In order to attain the above object, a collision mitigation apparatus for a corner portion of a forklift according to the present invention is provided with a collision mitigation apparatus installed on a body of a forklift to mitigate an impact upon a collision, 1 and a second and a third mounting surface; A first direction energy absorbing member coupled to the first mounting surface for absorbing impact in the lateral direction of the vehicle body, a second direction energy absorbing member coupled to the second mounting surface for absorbing impact in the front direction of the vehicle body, And a third direction energy absorbing member coupled to the third mounting surface so as to be positioned between the first direction energy absorbing member and the second direction energy absorbing member and absorbing impact in a corner direction of the vehicle body, ; A connecting band portion installed to surround the first, second, and third direction energy absorbing members from the outside and connecting the first, second, and third direction energy absorbing members to disperse the impact in all directions; And a guard portion of flexible material coupled to one surface of the connection band portion to transmit an impact to the connection band portion and protect the impact body.

The first, second, and third direction energy absorbing members are hollow tubes that are empty and have a plurality of corrugated accordion shapes to cause deformation during collision.

The connection band portion includes a first plate coupled to an end of the first direction energy absorbing body, a second plate bent from the first plate and extending in the direction of the third direction energy absorbing body, A fourth plate formed to be bent at the third plate and extending in the direction of the second direction energy absorbing body, and a second plate that is bent at the fourth plate, And a fifth plate coupled to an end of the second direction energy absorber.

The third plate is formed to be bent in the direction of the vehicle body at the edges of the second and fourth plates, and a mounting space portion is provided between the third plate and the guard portion, And an elastic block is provided in the mounting space portion so as to be able to absorb the elastic block.

A sensor unit installed at the connection band unit for detecting a collision and a control unit for braking a driving wheel of the forklift by a collision detection signal output from the sensor unit.

Wherein the base includes a magnetic pad attached to the vehicle body by a magnetic force, and a second mounting surface coupled to the magnetic pad, the first mounting surface, the second mounting surface, and the third mounting surface, And a dispersing plate for dispersing an impact to be transmitted.

The first, second, and third energy absorbers further include an elastic ring coupled to each of the plurality of grooves formed on the outer surface of the hollow tube, and a deformed hole The deformed holes are formed to have different sizes depending on the positions of the elastic rings. The smaller the size of the deformed holes is, the closer the elastic ring is to the base.

Each of the hollow tubes has a cut-out groove for each corrugated part, and the cut-out groove formed at the cornice is formed to be sequentially smaller toward the base part.

As described above, according to the present invention, it is possible to prevent breakage of a forklift and safety accidents caused by a collision by providing it at the corner of the body of the forklift.

In particular, three energy absorbing members for absorbing impacts in the forward, backward, lateral and corner directions can be provided to protect the vehicle body from impacts applied in various directions and to disperse the impact applied in any direction in a plurality of directions Impact energy can be minimized.

INDUSTRIAL APPLICABILITY The present invention has an effect of preventing breakage and damage of a vehicle in advance, increasing service life and reducing maintenance costs.

1 is a plan view showing a state where a collision mitigation apparatus according to an embodiment of the present invention is installed at a corner of a body of a forklift,
Fig. 2 is an exploded perspective view of Fig. 1,
Fig. 3 is an exploded perspective view of the collision mitigation apparatus applied to Fig. 1,
FIG. 4 is a block diagram showing a configuration for collision detection of the collision mitigation apparatus applied to FIG. 1,
5 is a perspective view showing a second direction energy absorbing body applied to the collision mitigation apparatus according to another embodiment of the present invention,
6 is a perspective view illustrating a second direction energy absorbing body applied to the collision mitigation apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an edge collision mitigation apparatus for a forklift according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, the collision mitigation apparatus 10 of the present invention is installed on a rear side of a vehicle body 3 of a forklift 1. For example, they can be installed at both right and left corner portions of the vehicle body 3.

The present invention absorbs shocks when colliding with a collision object in the process of moving the forklift 1, thereby preventing breakage and damage of the vehicle body 3. [ At the same time, it protects the damage of collision objects such as workers, facilities, and other vehicles.

A collision mitigation apparatus (10) of the present invention comprises a base portion (12) coupled to a corner portion of a vehicle body (3), and a multi-directional collision preventing portion A connecting band portion 50 to be coupled to the multi-directional buffer portion, and a guard portion 70 to be coupled to the connecting band portion 50.

The base portion 12 has first, second and third mounting surfaces 14, 18 and 16 which are joined to the corner portions of the vehicle body 3 and face in different directions.

A magnetic pad 11 attached to the vehicle body 3 as an example of the base portion 12 and first and second and third mounting surfaces which are coupled to the magnetic pad 11, 2, and a third direction energy absorbing member 20, 30, and 40, respectively.

The inner surface of the magnetic pad 11 is formed in a shape corresponding to a corner portion of the vehicle body 3, and the outer surface is formed to be bent. In this specification, the inner surface means a surface facing the direction of its own, and the outer surface means a surface directed toward the outer side of the vehicle body.

The magnetic pad 11 may be formed by molding a material having a permanent magnet therein or having a magnetic force therein. The magnetic pads 11 can be easily coupled to the vehicle body 3 of the forklift by a magnetic force. It is needless to say that the pad can be fixed to the vehicle body by welding, bolt or the like using a pad made of metal or synthetic resin having no magnetic property.

The dispersion plate 13 is coupled to the magnetic pad 11. To this end, a plurality of coupling protrusions 12b protruding toward the magnetic pad 11 are formed on the inner surface of the dispersion plate 13, and a plurality of coupling grooves 12b may be formed on the outer surface of the magnetic pad 11 . Alternatively, the dispersion plate and the magnetic pad may be bonded to each other in various manners.

The dispersion plate 13 is formed so as to bend in a shape corresponding to the outer shape of the magnetic pad 11. The first mounting surface 14, the second mounting surface 18, and the third mounting surface 16 are formed on the outer surface of the dispersion plate 13.

The first mounting surface, the second mounting surface, and the third mounting surface are formed to face in different directions. The first mounting surface 14 faces the lateral direction of the vehicle body 3, the second mounting surface 18 faces the front surface of the vehicle body 3, and the third mounting surface 16 faces the corner of the vehicle body 3 . The mounting surfaces may be provided with coupling jaws 15, 19, and 17 which are formed to protrude and engage with ends of the first, second, and third direction energy absorbing members, respectively.

The dispersion plate 13 serves to disperse impact transmitted through the first, second, and third direction energy absorbing members.

The multi-directional buffer portion is provided between the base portion 12 and the connection band portion 50.

The multi-directional shock absorber absorbs shocks applied in multiple directions, that is, in three directions, to mitigate shocks. Specifically, shocks are absorbed by absorbing impacts in the front direction (0 占 direction) of the vehicle body, the lateral direction of the vehicle body (90 占 direction), and the corner direction of the vehicle body (45 占 direction). The front or rear direction of the vehicle body can be regarded as a 0 degree direction and the side direction of the vehicle body can be regarded as a 90 degree direction based on the forward and backward moving directions of the forklift.

The multi-directional buffer includes a first direction energy absorbing body 20, a second direction energy absorbing body 30 and a third direction energy absorbing body 40 for absorbing impact in three directions.

The first direction energy absorbing member 20 is provided on the first mounting surface 14 of the dispersion plate 13 to absorb the impact in the lateral direction of the vehicle body 3.

The first direction energy absorbing member 20 is made of a hollow tube 21 whose interior is empty. The material of the hollow tube 21 may be formed of a rigid metal material or a flexible synthetic resin material. The hollow tube 21 is formed in an accordion shape having a plurality of corrugations and can be easily deformed when an impact is applied to the side of the vehicle body. During the collision, the hollow tube 21 acts to absorb external shocks by causing deformation such as collapse or warping.

A coupling protrusion 51a formed on the inner surface of the coupling band portion 50 at the other end of the hollow tube 21 is inserted and coupled with the coupling protrusion 15 formed on the first mounting surface 14 at one end of the hollow tube 21, Can be inserted and coupled. In addition, both ends of the hollow tube can be joined by welding or the like.

The second direction energy absorbing body 30 is formed of a hollow tube 31 having an accordion shape formed with a plurality of corrugations and hollow inside. The material of the hollow tube 31 may be formed of a rigid metal material or a flexible synthetic resin material. The hollow tube 31 is formed in an accordion shape formed with a plurality of corrugations and can be easily deformed when an impact in the front direction of the vehicle body 3 is applied. During the collision, the hollow tubular body 31 deforms such as collapse or bending, thereby absorbing external impact.

A coupling jaw 59 formed on the inner surface of the coupling band portion 50 at the other end of the hollow tube 31 is inserted and coupled with the coupling jaw 19 formed on the second mounting surface 18 at one end of the hollow tube 31, Can be inserted and coupled. In addition, both ends of the hollow tube can be joined by welding or the like.

The third direction energy absorbing member (40) absorbs impact in the corner direction of the vehicle body (3). The third direction energy absorbing body (40) is located between the first direction energy absorbing body (20) and the second direction energy absorbing body (30).

The third direction energy absorbing member 40 is formed of a hollow tube 41 having an accordion shape with a plurality of wrinkles formed therein and an empty interior. The material of the hollow tube 41 may be formed of a rigid metal material or a flexible synthetic resin material. The hollow tube 41 is formed in an accordion shape having a plurality of corrugations and can be easily deformed when an impact in the corner direction of the vehicle body 3 is applied. During the collision, the hollow tube 41 is deformed such as collapse or bending, thereby absorbing external impact.

The coupling step 17 formed on the third mounting surface 16 is inserted into one end of the hollow tube 41 and the coupling step 55a formed on the inner surface of the connecting band part is inserted into the other end of the hollow tube 41 Can be combined. In addition, both ends of the hollow tube 41 can be joined by welding or the like.

The connecting band portion 50 is installed to surround the first, second, and third energy absorbers 20, 30, and 40 in the outer direction. The connecting band portion 50 interconnects the first, second, and third direction energy absorbing members to disperse impacts in multiple directions to transmit impacts to the respective energy absorbing members and reduce kinetic energy by deformation.

The connecting band portion 50 can be formed by bending a rigid metal plate.

For example, the connection band portion 50 may include a first plate 51 coupled to an end of the first direction energy absorber 20, and a second plate 51 extending from the first plate 51 toward the third direction energy absorbing body 40 A third plate 55 coupled to the end of the third direction energy absorber 40 and formed to be bent at the second plate 53 and a third plate 55 which is bent at the third plate 55, A fourth plate 57 formed to extend in the second direction energy absorber 30 and extending in the direction of the second direction energy absorbing body 30 and a fifth plate 57 formed to be bent at the fourth plate 57, (59).

The third plate 55 is formed to be bent in the corner direction of the vehicle body 3 from the second plate 53 and the fourth plate 57. Therefore, the third plate 55 and the guard 70 are spaced apart from each other, and a recessed mounting space 60 is provided between the third plate 55 and the guard 70.

The mounting space portion 60 is provided with an elastic block 80. The elastic block 80 is formed of a flexible material such as rubber. The elastic block 80 primarily absorbs the impact applied in the corner direction of the vehicle body 3. Therefore, the elastic block 80 reinforces the buffering force of the energy absorber 40 in the third direction.

The guard portion 70 is coupled to the outer surface of the connection band portion 50 to transmit an impact applied from the outside to the connection band portion 50 and to reduce the impact. The guard portion 70 is made of a flexible material and protects the collision object which collides with the vehicle body 3 at the time of a collision. The guard portion 70 is formed of a flexible material such as rubber.

A plurality of coupling protrusions 90 may be formed on the outer surface of the connecting band portion 50 to couple the guard portion 70 to the connecting band portion 50. The engaging projection 90 includes a protruding bar 91 and a head 95 formed at an end of the protruding bar 91 and having a diameter larger than that of the protruding bar 91. A coupling hole 71 is formed in the guard portion 70 at a position corresponding to the coupling projection 90. The diameter of the engaging hole 71 is larger than the diameter of the protruding bar 91 and smaller than the diameter of the head 95. When the head 95 of the coupling protrusion forcibly enters the coupling hole 71, the coupling hole 71 of the flexible guard 70 is elastically expanded and the head 95 is inserted.

In the meantime, the present invention may further include a sensor unit for sensing a collision to stop the forklift in a collision state to reduce an impact, and a control unit 110 for controlling a driving unit of the forklift by an output signal of the sensor unit.

The sensor unit is installed in the connection band unit 50 and the elastic block 80 to detect a collision. Three sensors can be used as the sensor part. That is, the first sensor 101 is mounted on the first plate 51 of the connecting band portion to sense the collision of the vehicle body 3 in the lateral direction, and the second sensor 103 detects the collision of the fifth plate 59 of the connecting band portion, And the third sensor 105 is mounted on the elastic block 80 to sense collision of the vehicle body 3 in the corner direction. A conventional collision detection sensor can be used as the first to third sensors.

Mounting grooves are provided in the connecting band 50 and the elastic block 80 to mount the sensors. The first sensor 101 is mounted on the mounting groove 52 formed on the first plate 51 of the connecting band portion and the second sensor 103 is mounted on the mounting groove 58 formed on the fifth plate 59 of the connecting band portion. And the third sensor 105 is mounted to the mounting groove 85 formed in the elastic block 80. [ It is needless to say that the sensors installed in the respective mounting grooves are electrically connected to the control unit installed on the forklift, though not shown.

Each of the sensors is exposed to the outside through an exposure groove formed in the guard portion 70. That is, the first sensor 101 is exposed through the exposure groove 73 formed on one side of the guard portion 70, and the second sensor 103 is exposed through the exposure groove 77 formed on the other side of the guard portion 700 And the third sensor 105 is exposed through the exposure groove 75 formed at the center of the guard portion 70. [

The control unit 110 may control the braking unit 120 mounted on the forklift according to a collision detection signal output from the sensor unit, thereby braking the driving wheels. An ECU (electronic control unit) installed in the forklift can be used as the control unit 110. [

FIG. 5 illustrates a third direction energy absorber that can be applied to the multi-directional buffer according to another embodiment of the present invention.

Referring to FIG. 5, the third direction energy absorber 150 is formed of a hollow tube 151 having an accordion shape formed with a plurality of wrinkles and hollow inside. Further, the hollow tube 151 is provided with deformation promoting means to facilitate deformation in the event of a collision.

As one example of the deformation promoting means, a plurality of cut-out grooves 155 are provided. The incision groove 155 is formed for each of the corrugated nodules 153 of the hollow tube. The cutout groove 155 formed in each node 153 gradually decreases in size from the connecting band toward the base portion.

Due to the structure of the cutout groove 155, deformation of the hollow tube 151 near the connecting band portion is relatively severe, and deformation of the side away from the connecting band is less. Accordingly, when the impact is applied through the connecting band, the energy absorbing member 150 in the third direction can gradually protect the forklift by gradually reducing the impact energy.

Although not shown, the first and second direction energy absorbing members may be formed to have different cut-out grooves for each node of the hollow tube, as in the illustrated third direction energy absorbing member.

FIG. 6 illustrates a third direction energy absorber that can be applied to the multi-directional buffer according to another embodiment of the present invention.

Referring to FIG. 6, the third direction energy absorbing member 160 further includes an elastic ring 165 coupled to each of the plurality of grooves formed on the outer surface of the hollow tube 161.

The hollow tube 161 is formed into an accordion shape having a plurality of corrugations. Hence, grooves are formed between the corrugated nodes. One elastic ring 165 is engaged for each groove. The elastic ring 165 may be formed of a material capable of being elastically deformed. For example, it may be formed of a rubber material.

Since the elastic ring 165 is mounted between the nodes of the hollow tube 161, when the impact is applied to the hollow tube 161, when the hollow tube 161 deforms such as collapse or bending, The buffering effect of the energy absorber in the third direction can be further enhanced.

A deformation hole 167 is formed in each elastic ring 165. In the illustrated example, two elastic holes 167 are formed in one elastic ring so as to be vertically spaced. It is a matter of course that the cross section of the deforming hole 167 may be formed in various shapes other than a square shape. The deformed hole 167 is deformed by the deformation force applied to the elastic ring when the impact is applied to the hollow tube 161, and absorbs the shock.

Preferably, the deforming holes 167 formed in the elastic rings 165 are formed to have different sizes from each other. That is, the deformation holes 167 are formed to have different sizes depending on the positions of the elastic rings 165. For example, the deformation hole of the elastic ring at a position near the dispersion plate 13 of the base portion is smaller than the deformation hole of the elastic ring at a position close to the connection band portion 50. Therefore, as the elastic ring is closer to the base portion, the size of the deformation hole is formed smaller.

The above-described elastic ring structure is configured so that the size of the deformed hole is adjusted so that the impact absorbing force of each elastic ring becomes gradually smaller as it approaches the base portion. Therefore, when the impact is applied from the connecting band portion, the impact applied to the vehicle body can be smoothly mitigated by gradually reducing the impact energy.

Although not shown, the first and second direction energy absorbing members may also be formed in the same structure as the illustrated third direction energy absorbing member.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

1: Forklift 3: Bodywork
11: magnetic pad 13: dispersive plate
20: first direction energy absorbing member 30: second direction energy absorbing member
40: third direction energy absorbing member 50: connecting band
70: guard portion 80: elastic block
101: first sensor 103: second sensor
105: Third sensor

Claims (8)

Claims [1] A crash damping device installed on a vehicle body of a forklift to mitigate an impact upon collision,
A base portion coupled to a corner portion of the vehicle body and having first, second, and third mounting surfaces facing in different directions;
A first direction energy absorbing member coupled to the first mounting surface for absorbing impact in the lateral direction of the vehicle body, a second direction energy absorbing member coupled to the second mounting surface for absorbing impact in the front direction of the vehicle body, And a third direction energy absorbing member coupled to the third mounting surface so as to be positioned between the first direction energy absorbing member and the second direction energy absorbing member and absorbing impact in a corner direction of the vehicle body, ;
A connecting band portion installed to surround the first, second, and third direction energy absorbing members from the outside and connecting the first, second, and third direction energy absorbing members to disperse the impact in all directions;
And a guard portion of flexible material coupled to one surface of the connection band portion to transmit an impact to the connection band portion and protect the impact body,
The connection band portion includes a first plate coupled to an end of the first direction energy absorbing body, a second plate bent from the first plate and extending in the direction of the third direction energy absorbing body, A fourth plate formed to be bent at the third plate and extending in the direction of the second direction energy absorbing body, and a second plate that is bent at the fourth plate, And a fifth plate coupled to an end of the second direction energy absorbing member. 2. The forklift according to claim 1, wherein the first, second, and third energy absorbers are hollow tubes that are empty and have a plurality of corrugated accordions, Collision mitigation device. delete [2] The apparatus of claim 1, wherein the third plate is formed to be bent in the direction of the vehicle body at an edge of the second and fourth plates, and a mounting space portion is provided between the third plate and the guard portion,
Wherein an elastic block is provided in the mounting space part so that the impact applied in the third direction can be absorbed first. 2. The forklift according to claim 1, further comprising: a sensor unit installed at the connection band unit for detecting a collision; and a control unit for braking a driving wheel of the forklift by a collision detection signal output from the sensor unit. Corner area collision mitigating device. Claims [1] A crash damping device installed on a vehicle body of a forklift to mitigate an impact upon collision,
A base portion coupled to a corner portion of the vehicle body and having first, second, and third mounting surfaces facing in different directions;
A first direction energy absorbing member coupled to the first mounting surface for absorbing impact in the lateral direction of the vehicle body, a second direction energy absorbing member coupled to the second mounting surface for absorbing impact in the front direction of the vehicle body, And a third direction energy absorbing member coupled to the third mounting surface so as to be positioned between the first direction energy absorbing member and the second direction energy absorbing member and absorbing impact in a corner direction of the vehicle body, ;
A connecting band portion installed to surround the first, second, and third direction energy absorbing members from the outside and connecting the first, second, and third direction energy absorbing members to disperse the impact in all directions;
And a guard portion of flexible material coupled to one surface of the connection band portion to transmit an impact to the connection band portion and protect the impact body,
Wherein the base includes a magnetic pad attached to the vehicle body by a magnetic force, and a second mounting surface coupled to the magnetic pad, the first mounting surface, the second mounting surface, and the third mounting surface, And a dispersing plate for dispersing an impact to be transmitted to the corner portion of the forklift. The energy absorber according to claim 2, wherein the first, second, and third energy absorbers further include an elastic ring coupled to each of the plurality of grooves formed on the outer surface of the hollow tube,
The elastic ring is provided with a deforming hole for deforming its shape upon collision,
Wherein the deforming hole is formed to have a different size according to a position of the elastic ring, and a size of the deforming hole is smaller as the elastic ring is closer to the base. [3] The apparatus of claim 2, wherein the hollow tube has a cut-away groove formed in each corrugated part, and a cut-out groove formed in each of the corrugated parts is formed to gradually decrease in the direction of the base part, .

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