KR20190119742A - Spherical bearing for withdrawing protecting function using t-typed up-lift withdrawing protecting bar and guide plate - Google Patents

Abstract

The present invention relates to a spherical bearing, which is manufactured for withdrawing prevention so as to be possible to effectively resist withdrawing force while having a function of a spherical bearing. The spherical bearing includes a base plate, first and second lower friction plates, a stainless plate, first and second upper friction plates, upper and lower spherical caps, an upper plate, a T-shaped up-lift withdrawing preventing device and a guide plate, thereby being driven in a one directional driving end manner by the guide plate and being capable of negative reaction support by the T-shaped up-lift withdrawing preventing device and the guide plate.

Description

SPRINGICAL BEARING FOR WITHDRAWING PROTECTING USING T-TYPED UP-LIFT WITHDRAWING PROTECTING BAR AND GUIDE PLATE}

The present invention relates to a spherical bearing for preventing pull-out using a T-shaped up-lift pullout prevention guide and a guide plate. More specifically, the present invention relates to a spherical bearing for preventing pull, which has a function of a spherical bearing of a one-way movable end type, and which can effectively resist pullout force.

Figure 1a shows a perspective view of a conventional spherical bearing for preventing pull.

That is, in the bridge device provided between the bridge deck and the bridge to accommodate rotational displacement and movement displacement,

A lower plate 71 fastened to an upper side of the piers, and formed with a spherical seating groove having a predetermined radius of curvature in a central region;

A spherical shape having a shape corresponding to the spherical seating groove,

Is formed on the upper side of the spherical, and consists of an upper plate 72 disposed on the lower side of the bridge top plate,

The upper plate 72 is formed with guides 73 extending from both sides of the upper plate to both sides of the lower plate to face in the direction perpendicular to the bridge axial direction of the bridge,

A through hole 74 is formed in the guide 73 in a direction perpendicular to the bridge axially, and the lower plate has a pin 75 fixedly inserted therein corresponding to the through hole.

When the rotational displacement of the bridge in the axial direction of the bridge, the spherical surface is rotated along the spherical seating groove to accommodate the rotational displacement of the upper plate, the upper portion by the pin 75 inserted through the through hole of the guide It can be seen that it is to prevent the departure due to the accidental force of the plate.

Figure 1b shows a bridge device for a conventional movable spherical type bridge.

That is, the lower step 50 is provided by the anchor bolt on the piers, and having a lower stopper 51 for receiving a horizontal force;

An upper body 60 having an upper stopper 61 supporting the upper plate and receiving a horizontal force;

In the seating device consisting of a spherical bearing 70 is installed between the lower and upper answers to receive shock and vibration (load),

The lower stopper 51 of the lower step 50 and the synthetic resin rods 80 and 90 receiving horizontal forces transmitted from the upper plate between the inner and left and right sides of the upper stopper 61 of the upper answer 60 are interposed therebetween. To ensure that

Efficiently absorb the horizontal force generated from the upper structure in normal times by the synthetic resin rods 80 and 90, and at the same time ensure that the upper body 60 displaced by the horizontal force can always be restored to its original position with respect to the lower body 50. The effect is to achieve.

Figure 1c shows a perspective view of the conventional spherical bridge bearing.

The spherical indentation part 12 is formed in the protrusion 11 protruding upward, and the spherical indentation part 12 in which the spherical surface of the bearing plate 31 is rolled, and the lower stopper 13 in which the side blocks 14 are installed on both sides is formed. Lower answer 10;

A rubber pad is mounted on the spherical recess 12 of the lower step 10 to form a spherical surface that rotates, and a rubber pad including a fluorine resin plate (PTFE) 34 having a lower coefficient of friction with respect to the upper part 20. The bearing plate (33) is vulcanized (heat-sealed) and has pinned holes (32) formed in parallel with the holes (34a) of the fluororesin plate (34) and the holes (33a) of the rubber pad (33). A spherical bearing 30 composed of 31;

A pin 40 inserted into the pin fixing hole 32 of the bearing plate 30 having the fluorine resin plate (P.T.F.E) 34 and the rubber pad 33, and inserted into the key hole of the upper body 20;

A keyhole having a depth that can be inserted with the ends of the pins 40 spaced apart from each other is formed on the bottom, and has an upper stopper 21 that is restricted to the lower stopper 13 of the lower step 10 ( 20),

At this time, the lower stopper 13 is formed on both sides of the protrusion 11 having the spherical recess 12 and the side stop 14 is provided on the lower stopper 13 to hold the upper body 20. It can be seen that.

At this time, the upper answer 20 from the lower answer 10 adopts a side block 14 which serves as a kind of stopper in order to prevent the detachment due to the drawing due to the working load, but in practice, the side block 14 has a degree of locking means. Since there is a role, such as high-speed railway, such a shock acts largely had a problem that there is a limit.

Furthermore, although the pin 40 is inserted into the key hole of the upper answer 20, it can be seen that such a pin is for restraining the upper answer to the bearing plate, but is not a means for resisting the lifting force. It can be seen that no more effective means of controlling the lifting force in spherical bearings has yet been introduced.

That is, the conventional spherical bearings can be seen to be manufactured to have a function as a separate, movable bridge bearing for maintenance, but it can be seen that does not disclose a particularly effective configuration for the lifting force.

Republic of Korea Utility Model Registration No. 20-0398507 (Inventive name: Spherical type bridge device, date of publication: October 12, 2005) Republic of Korea Utility Model Registration No. 20-0402133 (Name of invention: movable spherical type bridge device, notification date: November 25, 2005) Republic of Korea Patent No. 10-1334104 (Invention name: bearing plate for bridge bearing using steel and bridge bearing using the same, notification date: August 31, 2011) Republic of Korea Patent Publication No. 2003-0058993 (Invention name: Operation support of the bridge, Announcement date: July 07, 2003)

Accordingly, the present invention is to solve the spherical bearing, more effective for preventing the pull-out, to provide a spherical bearing for preventing the pull-out using a T-type up-lift pullout prevention guide and a guide plate that can be manufactured in a one-way movable end method as a simple structure. It is assumed that the technical problem.

Pull-out spherical bearing using the T-shaped up-lift pullout prevention guide and guide plate to achieve the above object

A base plate having a central hole having a screw portion formed on an inner circumferential surface thereof and formed on a central bottom surface of the spherical groove of an upper surface thereof; A lower spherical cap having a central hole formed therein and accommodated in the spherical groove; A top groove is formed on the upper surface to accommodate the T-shaped up-lift pullout prevention cap and the upper spherical cap, and the center hole penetrates the socket part so that the T-type up-lift pullout prevention guard penetrates through the center of the bottom of the upper groove. Is formed, the upper plate is fixed to the lower end of the socket portion is inserted into the top of the spherical groove of the base plate; An upper spherical cap having a central hole formed therein and accommodated in the upper groove; A guide plate which is guided to a pin fixed horizontally by a guide block on an upper outer circumferential surface of the upper plate to slide on an upper surface of the upper plate; A portion of the upper plate and the vertical screw rod is accommodated in the upper groove of the upper plate, and the lower end is screwed into the center hole of the base plate through the center hole of the upper spherical cap, the center hole of the upper plate, and the lower hole of the lower spherical cap. And, the upper end is a T-shaped up-lift pull-out prevention formed in the upper groove of the upper surface of the upper plate; including, so that the upper plate is not drawn from the base plate by the T-shaped up-lift pullout.

The spherical bearing according to the present invention is greatly improved by using the T-type up-lift pull-out preventer formed by the fastening method and can be separated by a rotation method when replacing it later, and more efficient. Due to the simple structure it is possible to install in a one-way movable end method.

Figure 1a is a perspective view of a conventional spherical bearing of the one-way movable end method,
1B and 1C are structural perspective views of a conventional spherical bearing and a movable end spherical bearing,
2A, 2B and 2C are constituent elevation views, constituent perspective views and completed perspective views of a spherical bearing for preventing pull-out using a T-shaped up-lift pullout prevention guide and a guide plate of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

Figures 2a, 2b and 2c shows a constituent elevation view, a configuration perspective view and a complete perspective view of the spherical bearing 100 for preventing the pull-out using the T-type up-lift pullout prevention guide and the guide plate of the present invention, respectively.

The spherical bearing 100 for preventing pull-out using the T-type up-lift pullout prevention guide and the guide plate includes a base plate 110, first and second lower friction plates 120a and 120b, stainless plate 130, and first and second ones. The upper friction plate (140a, 140b), the upper and lower spherical caps (150a, 150b), the upper plate 170, T-type up-lift pullout prevention 180 and the guide plate 190 is configured.

First, as shown in FIGS. 2A, 2B, and 2C, the base plate 110 serves as a plate that is fixed by an anchor bolt, which is pre-installed in a bridge lower structure (eg, a pier), and is formed in a horizontal plate shape. However, it can be formed in various forms.

The upper surface of the base plate 110 is formed so that the lower spherical cap 150b and the lower portion of the upper plate 170 are accommodated in the shape of the groove in which the spherical groove 112 is dug.

The spherical groove 112 can be formed in the shape of a circular groove having a certain depth and diameter, the central hole 111 in the center of the spherical groove 112 so that the T-type up-lift pullout prevention 180 can be penetrated through. It can be seen that there is formed, the inner circumferential surface of the central hole 111 has a screw portion is formed so that it can be screwed to the lower end of the T-type up-lift pullout prevention 180.

Next, the spherical cap 150 is divided into upper and lower spherical caps 150a and 150b, as shown in FIGS. 2a, 2b and 2c.

The lower spherical cap 150b serves to offset and absorb the occurrence of displacement in the direction of the bridge by the temperature and the working load of the upper structure of the bridge (for example, the girder). The center hole 151 is also formed to penetrate) and the upper surface is curved upward, and the bottom surface is formed of a horizontally formed ring-shaped steel, brass, etc., which is based on the bearing plate based on FIGS. 1A and 1B. Corresponds to (31,70).

In this case, the first and second lower friction plates 120a and 120b and the stainless plate 130 may be further formed between the base plate 110 and the lower spherical cap 150b as shown in FIGS. 2A, 2B, and 2C. .

That is, the first lower friction plate 120a is formed as a horizontal plate-shaped ring installed to be inserted into a groove formed in the bottom surface of the lower spherical cap 150b and supports while absorbing the displacement transmitted from the lower spherical cap 150b. It serves to transfer the working load to the base plate 110 and is to be accommodated in the spherical groove (112).

The stainless plate 130 is located between the first lower friction plate 120a and the bottom of the spherical groove 112 so as not to interfere with the action of the first lower friction plate 120a and the lower spherical cap 150b, and also the central hole. 131 is to be accommodated in the spherical groove 112 in the form of a ring formed.

In addition, the second lower friction plate 120b is further formed on the upper surface of the lower spherical cap 150b. Since the upper surface of the lower spherical cap 150b is curved, a central hole 121 is formed to be in contact with the curved surface, and the upper surface is curved. It is to be formed in a ring shape, it is to be inserted into the groove formed in the lower bottom surface of the upper plate (170).

The second lower friction plate 120b is to be accommodated in the spherical groove 112, which is also a groove in the form of a ring while transferring and supporting the load transmitted from the upper plate 170 and the lower spherical cap 150b.

2A, 2B and 2C, the upper spherical cap 150a is formed on the bottom surface of the upper plate 181 and the upper plate 170 of the T-type up-lift pullout prevention device 180 to be described later ( 172) It is disposed between the bottom surface to facilitate the rotation of the upper plate 170 may be referred to as the lower spherical cap (150b) complement.

The upper spherical cap 150a is also formed with a central hole 151 through which the T-shaped up-lift pullout preventer 180 can penetrate, the upper surface is formed horizontally, and the lower surface is formed to be curved downward. The brass plate, etc. will be used.

At this time, the first and second upper friction plates 140a and 140b between the bottom surface of the upper plate 181 of the T-shaped up-lift pullout preventer 180 and the bottom surface of the upper groove 172 formed to be curved on the upper plate 170. ) May be further formed.

The first upper friction plate 140a is to be formed between the bottom of the upper spherical cap 150a and the bottom of the upper groove 172 formed in the upper plate 170, as shown in FIGS. 2A, 2B and 2C. Since the bottom surface is a curved surface, the central hole 141 is formed to be in contact with the curved surface, and the bottom and top surfaces are formed in a curved ring shape, respectively, and are inserted into the bottom groove 173 formed on the bottom surface of the top groove 172. Will be installed.

In addition, the second upper friction plate 140b is to be formed between the bottom surface of the upper plate 181 and the upper surface of the upper spherical cap 150a of the T-type up-lift pullout prevention 180, but also the central hole 141 is formed. And the bottom and the top surface is to be formed in a horizontal ring shape, it is to be inserted into the groove formed in the upper surface of the upper spherical cap (150a).

The first and second lower friction plates 140a and 140b may be formed on the upper plate 170 in the form of a ring so that the T-type up-lift pullout preventer 180 can more easily accommodate rotation inside the upper plate 170. It is to be accommodated in the formed upper groove 172.

2A, 2B, and 2C, the upper plate 170 serves as a plate fixed to a soul plate pre-installed on a bridge upper structure (eg, a girder), and a socket portion 174 protrudes downward from a bottom thereof. It can be seen that it is formed in the form of a horizontal plate, which corresponds to the upper (20, 60) based on Figures 1a and 1b.

The lower portion of the socket 174 is connected to the base plate 110 by being inserted into a predetermined depth at the top of the spherical groove 112 of the base plate 110.

Accordingly, the upper surface of the upper plate 170 is formed with an upper groove 172 that can accommodate the T-shaped up-lift pullout prevention 180 and the upper spherical cap 150a,

It can be seen that the center hole 171 penetrating the socket part 174 is formed in the center of the bottom surface of the upper groove 172 so that the T-shaped up-lift lifting prevention device 180 can be fastened through.

The central hole 171 is to be penetrated through the T-shaped up-lift pullout preventer 180 is not fastened.

In addition, it can be seen that the bottom of the upper plate 170 is formed in a groove shape corresponding to the shape of the lower spherical cap 150b so that the lower spherical cap 150b can be accommodated, and the guide plate 190 is formed on the upper outer circumferential surface thereof. The pin 192 is inserted into the horizontal to form a pin hole to be installed, the guide block 391 formed with a through hole so that the pin 192 can be penetrated to be formed integrally around the pin hole.

2A, 2B and 2C, the T-shaped up-lift pullout preventer 180 is a vertical rod-shaped vertical bar extending below the bottom of the center of the upper plate 181 and the upper plate 181 It includes a four-rod 182, the screw portion is formed only on the lower outer peripheral surface so that the lower end is screwed into the central hole 111 of the base plate (110).

The T-shaped up-lift pullout 180 is a part of the upper plate 181 and the vertical screw rod 182 in the upper groove 172 of the upper plate 170, the upper groove of the upper plate 170 The center hole 141 of the second upper friction plate 140b, the center hole 151 of the upper spherical cap 150a, the center hole 141 of the first upper friction plate 140a, and the upper plate The central hole 171, the central hole 121 of the first lower friction plate 120a, the central hole 151 of the lower spherical cap 150b, the central hole 121 of the second lower friction plate 120b and the stainless plate ( Installed through the central hole 131 of 130,

The lower end is screwed to the base plate 110, the vertical screw rod 182 is formed in a form that is not otherwise screwed to play an important role to resist the drawing of the spherical bearing due to the working load do.

Next, the guide plate 190 moves in one direction by the guide groove 195 of the guide 194 of the guide plate 190 inserted into the pin 192 formed on the upper plate 170. To be possible.

Accordingly, the guide plate 190 includes a guide block 191, a pin 192, a guide upper plate 193, a guide 194, a guide hole 195, an upper stainless plate 196, and a guide friction plate 197. Include.

First, the guide block 191 is formed in a block shape on the upper outer circumferential surface of the upper plate 170, as shown in Figures 2a, 2b and 2c is used that the through-hole is formed so that the pin 192 can pass through. , To favor the stable horizontal fixation of the pin 192, and serves to offset the impact light transmitted from the guide 192.

2A, 2B, and 2C, the pin 192 penetrates the guide block 191 and is inserted into the upper end of the upper plate 170 at a predetermined depth so as to be fixed to the guide block 191. When installed so that the end is fitted to the upper plate while being fastened, a stable horizontal setting is possible and it is easy to separate later.

The guide upper plate 193 is a plate member which is integrated with the saw plate of the bridge upper structure as shown in FIGS. 2A, 2B and 2C and moves together as the bridge upper structure moves in one direction. .

2A, 2B, and 2C, the guide 194 is formed in a U-shape so that the guide hole 195 is formed, and the upper surface is integrated with the bottom surface of the upper guide plate 193.

Accordingly, the guide hole 195 penetrates the pin 192 so that the guide 194 is limited in one direction by the pin 392 so that the guide plate integrated with the bridge substructure by the pin 392 is not drawn out. It also plays a role.

The guide friction plate 197 is fitted into the groove formed on the upper plate 170, and the upper stainless plate 196 is positioned between the guide friction plate 197 and the bottom of the guide plate 190 to enable one-way operation. Done.

According to Figure 2c, the spherical bearing 100 for preventing the pull-out using the T-type up-lift pull-out of the one-way movable end type base is formed anchor bolts to be fixed to the bridge lower structure (shift, piers) Plate 110, the first and second lower friction plates 120a and 120b set up and down accommodated in the upper plate 170, the stainless plate 130, the first and second upper friction plates 140a and 140b, upper and lower parts Spherical caps (150a, 150b), T-shaped up-lift pullout prevention 180, the upper plate 170 is to be fixed to the soul plate fixed to the anchor bolt to the upper structure of the bridge (girder, etc.) It can be seen.

At this time, in the pull-out spherical bearing 100 using the T-type up-lift pull-out of the one-way movable end method, the first and second set up and down accommodated in the upper plate 170 to enhance the spherical function Lower friction plates 120a and 120b, stainless plate 130, first and second upper friction plates 140a and 140b, upper and lower spherical caps 150a and 150b, and T-type up-lift pullout preventers 180 It can be seen that more than two can be installed.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: Anti-pulling spherical bearing with T-shaped up-lift pullout and guide plate
110: base plate 111: central hole
112: spherical groove 120a, 120b: the first and second lower friction plate
130: stainless plate 140a, 140b: first and second upper friction plate
141: central hole 150: spherical cap
150a, 150b: upper and lower logical caps
151: concourse
170: upper plate 171: central hole
172: top groove 173: bottom groove
174: socket
180: T type up-lift pullout
181: head 182: vertical screw rod
190: guide plate
191: guide block 192: pin
193: upper guide plate 194: guide
195: guide hole 196: upper stainless plate
197: guide friction plate

Claims (8)

A base plate 110 having a central hole 111 having a screw portion formed on an inner circumferential surface thereof, formed on a central bottom surface of the spherical groove 112 of an upper surface thereof;
A lower spherical cap 150b having a central hole 151 formed therein and installed in the spherical groove 112;
An upper groove 172 is formed on the upper surface to accommodate the T-shaped up-lift pullout prevention device 180 and the upper spherical cap 150a, and a T-type up-lift pull-out chamber is formed at the center of the lower surface of the upper groove 172. A central hole 171 penetrating through the socket portion 174 is formed to allow the earth 180 to be fastened therethrough, and an upper portion of the spherical groove 112 of the base plate 110 inserted into and fixed to the lower end of the socket portion 174. Plate 170;
An upper spherical cap 150a having a central hole 151 formed therein and installed in the upper groove 172;
A guide plate 190 guided to a pin 192 horizontally fixed by a guide block 191 on an upper outer circumferential surface of the upper plate 170 to slide on an upper surface of the upper plate 170;
A portion of the upper plate 181 and the vertical screw rod 182 is accommodated in the upper groove 172 of the upper plate 170, the central hole 151 of the upper spherical cap 150a, the central hole 171 of the upper plate. ), The lower end is screwed into the central hole 111 of the base plate 110 by penetrating through the central hole 151 of the lower spherical cap 150b, and the upper end is formed inside the upper end of the upper groove of the upper plate 170. Including; T-type up-lift pullout prevention 180;
A spherical bearing for preventing pull-out using a T-type up-lift pullout prevention guide and a guide plate to prevent the upper plate 170 from being drawn from the base plate 110 by the T-type pull-out pullout prevention 180. The method of claim 1,
A first lower friction plate 120a is further mounted on the bottom surface of the lower spherical cap 150b, and a stainless plate 130 is further installed between the first lower friction plate 120a and the upper surface of the spherical groove 112. A second lower friction plate 120b is further mounted on the upper surface of the spherical cap 150b, and the first lower friction plate 120a, the stainless plate 130, and the second lower friction plate 120b are accommodated in the spherical groove 112. Pull-out spherical bearings with T-shaped up-lift pullouts and guide plates. The method of claim 1,
The T-type up-lift pullout prevention 180 is
The upper plate 181 of the circular plate shape and the vertical screw rod 182 of the circular rod shape extending below the bottom of the center of the upper plate 181, the lower end is screwed into the central hole 111 of the base plate 110 T-shaped up-lift pullout prevention guide and guide plate for receiving a portion of the upper plate 181 and the vertical screw rod 182 is formed in the upper groove 172 of the upper plate 170 so that the threaded portion is formed only on the lower outer peripheral surface Drawing spherical bearings. The method of claim 1,
The first upper friction plate 140a and the second upper friction plate 140b are further formed on the upper and lower surfaces of the upper spherical cap 150a accommodated in the upper groove 172.
The first upper friction plate 140a is formed between the bottom surface of the upper spherical cap 150a and the bottom surface of the upper groove 172 formed on the upper plate 170, and the lower groove 173 formed on the lower surface of the upper groove 172. To be installed in the
The second upper friction plate 140b is to be formed between the bottom surface of the upper plate 181 and the upper surface of the upper spherical cap 150a of the T-shaped up-lift pullout prevention 180, but formed on the upper surface of the upper spherical cap 150a Is inserted into the groove and installed,
The first and second lower friction plates (140a, 140b) is a spherical bearing for preventing pull-out using a T-shaped up-lift pullout and guide plate to be accommodated in the upper groove 172 formed in the upper plate (170). The method of claim 4, wherein
The T-type up-lift pullout prevention 180 is
While the upper plate 181 and the vertical screw rod 182 are partially accommodated in the upper groove 172 of the upper plate 170, the second upper friction plate 140b of the upper plate 170 is accommodated in the upper groove 172 of the upper plate 170. The central hole 141, the central hole 151 of the upper spherical cap 150a, the central hole 141 of the first upper friction plate 140a, the central hole 171 of the upper plate, the first lower friction plate 120b It is installed through the central hole 121, the central hole 151 of the lower spherical cap 150b, the central hole 121 of the second lower friction plate 120b and the central hole 131 of the stainless plate 130 The base plate 110 is screwed into the central hole 111, the upper end of the spherical bearing for preventing pull-out using a T-shaped up-lift pullout prevention guide and guide plate formed inside the upper groove of the upper plate 170. The method of claim 1,
The guide block 191 of the guide plate 190 is formed in a block shape on the upper outer circumferential surface of the upper plate 170 to use a through-hole formed so that the pin 192 can pass through,
The pin 192 penetrates the guide block 191 so that the end is inserted into the upper end of the upper plate 170 so as to be fixed to the guide block 191 while the end is fitted to the upper plate. Pull-out spherical bearings using T-shaped up-lift pullout guards and guide plates that can be set horizontally and detachable later. The method of claim 6,
The guide plate 190 allows the upper guide plate 193 to slide on the upper surface of the upper plate 170, the upper guide plate 193 is a portion that is integrated in contact with the saw plate of the upper bridge structure, the bridge upper structure is one direction It is a plate member that can be moved together as it moves by moving,
A guide 194 is formed in the guide upper plate 193, but the guide 194 is formed in a U-shape so that the guide hole 195 is formed so that the upper surface is integrated with the bottom of the guide upper plate 193. Pull-out spherical bearings with type up-lift pull-out. The method of claim 7, wherein
The guide hole 195 penetrates the pin 192 so that the guide 194 is limited in one direction by the pin 192, so that the guide plate integrated with the bridge lower structure by the pin 192 is not drawn out. The guide friction plate 197 is inserted into the groove formed on the upper plate 170, and the upper stainless plate 196 is positioned between the guide friction plate 197 and the bottom of the guide plate 190 in one direction. Pull-out spherical bearings using T-shaped up-lift pull-outs to enable operation.

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