CN217422722U - Screen rotating structure - Google Patents

Abstract

The utility model relates to a screen revolution mechanic for connect a screen, including a conjunction, one bears body and plural number slip group, this conjunction has a tie side to connect at a rear side of this screen, and a combination side has a first joint portion, a second joint portion and a third joint portion, this bears the weight of the body and has a spout portion corresponding this combination side of conjunction, this spout portion includes that a first arc spout extends to the left from the right of a virtual vertical central line of this bearing body has a terminal, be equipped with a second arc spout and a straight line spout respectively in this terminal left side and right side of this first arc spout, this slip group contains a first slip group, a second slip group, a third slip group establishes respectively in this first, second arc spout and this straight line spout, the one end of this first, second, third slip group respectively with this first, a first slip group, a second, a straight line spout, The second and third combining parts are connected to make each combining part slide along with each corresponding sliding group, thereby driving the screen to rotate.

Description

Screen rotating structure

Technical Field

The present invention relates to a screen rotation structure, and more particularly to a screen rotation structure that can achieve the effects of easy operation and no interference between the screen and the desktop.

Background

With the widespread use of flat panel displays, the functions of the support frame for supporting the display screen are becoming more complete and diversified, such as adjusting the elevation angle, rotating left and right, or adjusting the height. For example, the conventional screen is mostly horizontal when in use, and the display screen is also horizontal, and when viewing straight documents, pictures or pictures, the screen is reduced and inconvenient. In order to facilitate the viewing of the screen, the screen must be rotated from a horizontal state to a vertical state by the rotation function of the support frame. However, another problem is that in the process of rotating the horizontal screen into the vertical screen, the screen is easily obstructed by the desktop and cannot be rotated (rotated) continuously, so that the user must first raise the height of the supporting frame, and the height of the supporting frame needs to be adjusted to the height that the screen cannot touch the desktop in the process of rotating the screen into the vertical direction, so that the screen can be rotated from the horizontal direction into the vertical direction, and the operation convenience in use is poor.

In addition, the rotation function of the existing support frame can only stop the screen at two angles of the horizontal direction and the straight direction, but the rotation angle between the horizontal direction and the straight direction of the screen cannot be maintained to be stopped, that is, when a user rotates the screen upwards from the horizontal direction, for example, 45 degrees or 65 degrees, the hand of the user does not continuously support the screen, the gravity acceleration can quickly fall back to the horizontal position due to the overweight of the screen, so that the screen or the support frame is damaged, the safety in use is not good, and the like.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a screen rotation structure capable of achieving the effects of easy operation and preventing the screen from interfering with the desktop when rotating.

In order to achieve the above object, the present invention provides a screen rotation structure for connecting a screen, which is characterized in that the screen rotation structure comprises:

a combining piece, which is provided with a connecting side and a combining side respectively positioned at two sides of the combining piece, wherein the connecting side is connected with a rear side of the screen, and the combining side is provided with a first combining part, a second combining part and a third combining part;

the bearing body is provided with a sliding groove part corresponding to the combination side of the combination part, the sliding groove part comprises a first arc-shaped sliding groove, the first arc-shaped sliding groove extends from the right side of a virtual vertical central line of the bearing body to the left side of the virtual vertical central line to form a tail end, a second arc-shaped sliding groove is arranged on the left side of the tail end of the first arc-shaped sliding groove, a straight sliding groove is arranged on the right side of the tail end of the first arc-shaped sliding groove, the second arc-shaped sliding groove extends from the lower side of a virtual horizontal central line of the bearing body to the upper side of the virtual horizontal central line, and the straight sliding groove extends upwards from the upper side of the first arc-shaped sliding groove; and

and a plurality of sliding groups, including a first sliding group, a second sliding group and a third sliding group respectively arranged in the first arc-shaped sliding groove, the second arc-shaped sliding groove and the linear sliding groove, wherein one end of the first sliding group, one end of the second sliding group and one end of the third sliding group are respectively connected with the first combination part, the second combination part and the third combination part of the combination part, and the first sliding group and the second sliding group respectively slide along the arc extending direction of the first arc-shaped sliding groove and the second arc-shaped sliding groove and the third sliding group slide in the linear sliding groove, so that each combination part slides along the corresponding sliding group, thereby driving the screen to rotate.

The screen rotating structure, wherein: the first sliding group, the second sliding group and the third sliding group are respectively provided with a sliding body and a connecting piece, the sliding bodies of the first sliding group, the second sliding group and the third sliding group are respectively provided with a sliding body outer side which is arranged in the first arc-shaped sliding groove, the second arc-shaped sliding groove and the linear sliding groove, the sliding bodies are respectively provided with a sliding body through hole, the connecting pieces of the first sliding group and the second sliding group respectively penetrate through the sliding body through holes of the first sliding group and the second sliding group and are connected with the first combining part and the second combining part, and the connecting piece of the third sliding group is connected with one end of the third combining part penetrating through the third sliding body.

The screen rotating structure, wherein: the third sliding group is further provided with a pair of sliding rails and a moving plate, the pair of sliding rails are arranged on the rear side of the bearing body and are adjacent to two sides of the linear sliding groove, the moving plate is connected to the pair of sliding rails in a crossing mode and is provided with an opening penetrating through two sides of the moving plate, and the opening is combined with one end of the sliding body of the third sliding group.

The screen rotating structure, wherein: an elastic piece is arranged between the pair of slide rails of the third sliding group, is arranged at the top side adjacent to the bearing body and is positioned above the linear sliding groove to be connected with the moving plate.

The screen rotating structure, wherein: the elastic element is a constant force spring.

The screen rotating structure, wherein: the combining part is a frame or a screen back frame.

The screen rotating structure, wherein: still contain a box body and a base, this box body and base are established in the bottom of this box body, and this box body is equipped with an enclosing cover, and this enclosing cover lid closes on a frame portion, has a accommodation space in this frame portion, supplies to place this and bears the weight of the body, and is equipped with plural fluting in the bottom side of this frame portion, and this plural fluting corresponds first arc spout, second arc spout and this sharp spout respectively.

The screen rotating structure, wherein: the first sliding set is further provided with a linkage part and a propping part, the linkage part and the propping part are arranged on the linkage part, one end of the linkage part is connected with the outer side of the sliding body of the first sliding set, and the other end of the linkage part is pivoted on the bearing body.

The screen rotating structure, wherein: the bearing body is provided with a pair of stopping parts which are arranged at the front side of the bearing body and are respectively positioned at the front end adjacent to the first arc-shaped sliding groove and the lower side of the tail end.

Borrow by the utility model discloses should first, two slip groups slide and this third slip group slides in this sharp spout along the arc extending direction of this first, two arc spouts respectively, make each this joint portion follow and correspond each this slip group and slide, borrow this screen of drive and do the rotation for can let this screen can not be good with the effect and the operation convenience that the desktop interferes when rotatory.

Drawings

Fig. 1 is an exploded perspective view of an embodiment of the present invention.

Fig. 2 is a perspective view of an embodiment of the present invention.

Fig. 3A is an actuation schematic diagram of the first, second, and third sliding sets and the linking portion of the bearing body of the present invention.

Fig. 3B is another schematic view of the first, second, and third sliding sets and the linking portion of the carrier body according to the present invention.

Fig. 4A is a schematic view of an embodiment of the present invention in which the screen is horizontally disposed and upwardly rotated to a rotation angle of, for example, 45 degrees.

Fig. 4B is a schematic view of an embodiment of the present invention in which the rotation angle of the screen is 75 degrees, and the screen is rotated upward to be upright.

Fig. 5 is a schematic view of the screen connected to the screen rotating structure of the present invention being placed on a desktop.

The reference numbers illustrate: a screen rotating structure 1; a bonding member 11; a connecting side 110; a bonding side 111; first, second, and third coupling portions 112, 113, and 114; a carrier body 12; a front side 120; a rear side 121; a slide groove portion 122; first and second arc chutes 123, 124; a front end 1230; a tip 1231; a linear chute 125; a stopper portion 126; first, second and third sliding groups 13, 14 and 15; sliders 131, 141, 151; slide outsides 1311, 1411, 1511; the sliding body through holes 1312, 1412 and 1512; connectors 133, 143, 153; a linking portion 135; an abutting portion 136; a slide rail 155; a moving plate 156; an opening 1561; an elastic member 17; a case 18; a slot 181; an outer cover 182; a frame portion 183; an accommodating space 1831; a base 19; a screen 2; a screen housing 21; a housing bore 211; a table 3; a tabletop 31; a virtual vertical centerline L1; a virtual horizontal center line L2.

Detailed Description

The above objects, together with the structure and functional characteristics of the invention, will be best understood from the following description of the preferred embodiments when read in connection with the accompanying drawings.

The utility model provides a screen revolution mechanic 1 is for connecting a screen 2, and this screen 2 contains a display panel (like liquid crystal display panel or emitting diode display panel; not shown in the figure), a screen back of the body frame and a screen shell 21, and this screen back of the body frame is connected at this display panel's rear side and together is framed in this screen shell 21, and this screen shell 21 has seted up plural shell hole 211 and has run through to this screen shell 21's the outside from this screen shell 21's inboard.

Referring to fig. 1, fig. 2, fig. 4A, fig. 4B, and fig. 5, as shown in the figure, the screen rotating structure 1 includes a connecting member 11, a carrying body 12, and a plurality of sliding sets. The connector 11 is a frame or a screen frame, in this embodiment, the connector 11 is illustrated as a screen frame, that is, the connector 11 is one of the partial components of the screen 2 itself, the connector 11 has a connecting side 110 and a connecting side 111 respectively located at two sides of the connector 11, the connecting side 110 is connected to the rear side of the display panel of the screen 2, and the connecting side 111 of the connector 11 is disposed in the screen shell 21 of the screen 2, but not limited thereto. In one embodiment, the joint member 11 can be a single frame and the screen 2 can be two independent components, and the whole screen 2 is accommodated in the joint member 11.

The combining side 111 of the combining member 11 has a first combining portion 112, a second combining portion 113 and a third combining portion 114, the first, second and third combining portions 112, 113 and 114 are disposed on the combining side 111 at intervals and respectively protrude to the outside of the screen housing 21 toward the housing holes 211 corresponding to the screen 2, in this embodiment, the first, second and third combining portions 111, 112 and 113 are explained by a screw-lock structure.

Referring to fig. 1 and 2, the supporting body 12 is a plate-shaped body, and has a front side 120, a rear side 121 and a sliding slot portion 122 corresponding to the connecting side 111 of the connecting member 11, and the sliding slot portion 122 has a first arc-shaped sliding slot 123, a second arc-shaped sliding slot 124 and a straight sliding slot 125 respectively penetrating from the front side 120 to the rear side 121 of the supporting body 12.

Further, referring to fig. 3A and 3B, in order to clearly illustrate the arrangement of the sliding grooves of the sliding groove portion 122, the carrying body 12 has a virtual vertical central line L1 and a virtual horizontal central line L2 which intersect each other. Wherein the virtual vertical center line L1 extends vertically from the top side of the carrier body 12 to the bottom side of the carrier body 12 as shown by the vertical dashed line in fig. 3A, and the virtual horizontal center line L2 extends horizontally from the left side of the carrier body 12 to the right side of the carrier body 12 as shown by the horizontal dashed line in fig. 3A. The first curved sliding slot 123 has a front end 1230 extending from the right side of the virtual vertical center line L1 of the carrying body 12 to the left side of the virtual vertical center line to form a tail end 1231, a second curved sliding slot 124 is disposed at the left side of the tail end 1231 of the first curved sliding slot 123, and a straight sliding slot 125 is disposed at the right side of the tail end 1231 of the first curved sliding slot 123. The second arc-shaped sliding slot 124 extends from the lower edge of the virtual horizontal center line L2 of the carrying body 12 to the upper edge of the virtual horizontal center line L2. The linear chute 125 extends upward from the upper side of the first arc-shaped chute 123.

Referring to fig. 3A and 3B, a pair of stopping portions 126 are disposed on the front side 120 of the supporting body 12 and respectively located under the front end 1230 and the end 1231 of the first arc chute 123. The sliding sets include a first sliding set 13, a second sliding set 14, and a third sliding set 15 respectively disposed in the first arc-shaped sliding slot 123, the second arc-shaped sliding slot 124, and the linear sliding slot 125, wherein one end of the first sliding set 13, the second sliding set 14, and the third sliding set 15 is respectively combined with the first combining portion 112, the second combining portion 113, and the third combining portion 114. With this arrangement, the first and second sliding sets 13 and 14 respectively slide along the arc extending directions of the first and second arc sliding slots 123 and 124 and the third sliding set 15 slides up and down in the linear sliding slot 125, so that each of the connecting portions slides along the corresponding sliding set, thereby driving the screen to rotate.

Referring to fig. 1, 3A and 3B, the structure and connection relationship of the first, second and third sliding sets 13, 14 and 15 will be described in detail.

The first, second and third sliding sets 13, 14 and 15 each have a sliding body 131, 141 and 151 and a connecting member 133, 143 and 153. In the embodiment, the structures of the sliding bodies 131 and 141 of the first and second sliding groups 13 and 14 are different from the structure of the sliding body 151 of the third sliding group 15, that is, the sliding bodies 131 and 141 of the first and second sliding groups 13 and 14 are composed of two sliding blocks, and the sliding body 151 of the third sliding group 15 is composed of one sliding block. In practical implementation, the structures of the sliding bodies 131, 141, 151 of the first, second, and third sliding groups 13, 14, 15 may be designed to be the same.

The sliding bodies 131, 141, 151 of the first, second, and third sliding groups 13, 14, 15 respectively have a sliding body outer side 1311, 1411, 1511 and a sliding body through hole 1312, 1412, 1512 penetrating through each sliding body 131, 141, 151. The outer sides 1311, 1411, 1511 of the first, second, third sliding sets 13, 14, 15 are slidably disposed in the first, second arc chutes 123, 124 and the linear chute 125, respectively. Specifically, the sliding bodies 131 of the first sliding group 13 slide back and forth along the arc direction of the first arc-shaped sliding groove 123 (e.g., slide from left to right or slide from right to left), and the sliding bodies 141, 151 of the second and third sliding groups slide back and forth along the arc direction of the second arc-shaped sliding groove 124 and the linear direction of the linear sliding groove 125 (e.g., slide from bottom to top or slide from top to bottom), respectively.

The connecting members 133, 134 (e.g. screws) of the first and second sliding sets 13, 14 respectively penetrate through the sliding body through holes 132, 142 of the first and second sliding bodies 131, 141 and are connected to the corresponding first and second connecting portions 112, 113 in a locking manner. The connecting member 153 (e.g., a nut) of the third sliding set 15 is locked with an end of the third coupling portion 114 of the coupling member 11 penetrating through the third sliding body 151. Thus, the joint member 11 is coupled to the load-bearing body 12. In this embodiment, the connecting members 133 and 143 of the first, second, and third sliding sets 13, 14, and 15 are respectively engaged with the first, second, and third combining portions 112, 113, and 114 by screw-locking structures, but the invention is not limited thereto. In another embodiment, the connecting members 133 of the first, second and third sliding sets 13, 14 and 15 and the first, second and third engaging portions 112, 113 and 114, respectively, may be a pin structure or other engaging structure.

Referring to fig. 3A, the first sliding set 13 further has a linking portion 135 and an abutting portion 136 disposed on the linking portion 135, the linking portion 135 is, for example, a rod and is located between the pair of stopping portions 126, that is, one end of the linking portion 135 is connected to the outer side 1311 of the sliding body 131 of the first sliding set 13, and the other end of the linking portion 135 is pivoted on the carrying body 12, so that the linking portion 135 slides back and forth along with the sliding body 131 of the first sliding set 13 in the first arc sliding slot 123, and the linking portion 135 is limited by the pair of stopping portions 126 to limit the back and forth sliding displacement amplitude of the linking portion 135, and further the sliding amplitude of the sliding body 131 of the first sliding set 13 is limited, thereby effectively protecting the sliding body 131 of the first sliding set 13 from sliding over head and being damaged.

Referring to fig. 4A and 4B, referring to fig. 1, the third sliding set 15 further includes a pair of sliding rails 155 and a moving plate 156, the pair of sliding rails 155 are disposed at the rear side 121 of the carrying body 12 and adjacent to two sides of the linear sliding groove 125, that is, the pair of sliding rails 155 is, for example, a linear sliding rail 155 disposed in parallel with the linear sliding groove 125. The moving plate 156 is slidably connected to the pair of sliding rails 155 in a straddling manner, and an opening 1561 is provided to penetrate through both sides of the moving plate 156, the opening 1561 is sleeved and combined with one end of the sliding body 151 of the third sliding group 15, so that the moving plate 156 slides back and forth on the pair of sliding rails 155 along with the sliding body 151 of the third sliding group 15 in the linear sliding groove 125.

An elastic element 17 is disposed between the pair of sliding rails 155 of the third sliding set 15 and is disposed near the top side of the carrying body 12, and is located above the linear sliding groove 125 and connected to the moving plate 156, that is, the elastic element 17 is, for example, a rollable constant force spring (or constant force tension spring) having the functions of back-rolling constant force and fixed force, so that one end of the elastic element 17 can be elastically deformed, rolled and retracted along with the upward sliding of the moving plate 156, or elastically deformed, rolled and stretched along with the downward sliding of the moving plate 156. When the horizontally disposed (horizontal) screen 2 rotates to any rotation angle (e.g. 0-90 degrees) and any height between the vertically disposed (vertical) screens 2, the elastic member 17 keeps the screen 2 in a suspended state, for example, after the upward rotation angle of the horizontally disposed (e.g. 0 degree) screen 2 is 45 degrees, the movable plate 156 is kept fixed at the current moving position by the fixed force characteristic of the elastic member 17, and the sliding bodies 131, 141, 151 of the first, second, and third sliding groups 13, 14, 15 are further limited to be kept at the current moving position. Therefore, the effect of overall safety is effectively improved, and the problem that the user is injured by falling down automatically due to the overweight of the screen 2 after the screen 2 rotates to a half and loosens hands suddenly and leaves the screen 2 can be solved.

Referring to fig. 1 and 5, in order to be placed on a carrier 3 (such as a table 3), the bottom of the screen rotation structure 1 of the present invention may be additionally provided with a base 19, and the periphery of the screen rotation structure may be additionally provided with a box 18 for protection and dust prevention, i.e., the screen rotation structure 1 further comprises a box 18 and a base 19 disposed at the bottom of the box 18. The box body 18 has a cover 182 covering a frame 183, and the frame 183 has a receiving space 1831 for placing the carrying body 12. And a plurality of slots 181 are disposed on the bottom side of the frame portion 183 of the accommodating space 1831, the slots 181 correspond to the first, second arc-shaped chutes 123, 124 and the linear chute 125, respectively, and the slots 181 are penetrated by the first, second and third coupling portions 112, 113 and 114, respectively, so that the first, second and third coupling portions 112, 113 and 114 are coupled to the case 18.

Therefore, the carrying body 12 is enclosed in the box 18 to effectively protect the carrying body 12 and achieve the dustproof effect. In addition, the position of the empty space in the accommodating space 1831 of the box body 18 (for example, the position of the accommodating space 1831 without the notch 181) can be used to accommodate other components (for example, a PC motherboard, a fan, and a hard disk electronic component).

The following description is given:

referring to fig. 1, 4A, 4B and 5, when the screen 2 rotates, after a user applies a force path to the horizontally-swinging screen 2 upwards, the connecting member 11 on the screen 2 is forced upwards to rotate upwards (for example, counterclockwise; as shown in fig. 4A), and simultaneously, the sliding bodies 131 of the first sliding group 13 slide along the first arc-shaped sliding groove 123 from left to right, and the sliding bodies 141 and 151 of the second and third sliding groups 14 and 15 slide along the second arc-shaped sliding groove 124 and the linear sliding groove 125 from bottom to top, respectively. When the rotation angle (e.g. 75 degrees) of the joint member 11 is close to the upright position (e.g. 90 degrees), the sliding body 131 of the first sliding set 13 is close to the middle position of the first arc-shaped sliding slot 123, and the sliding bodies 151 of the second and third sliding sets 15 are close to the upper ends of the second arc-shaped sliding slot 124 and the linear sliding slot 125, respectively (see fig. 4B), and then after the screen 2 rotates to the upright position, the sliding body 131 of the first sliding set 13 stays at the end 1231 of the first arc-shaped sliding slot 123, and the sliding bodies 141, 151 of the second and third sliding sets 14, 15 stay at the upper end of the second arc-shaped sliding slot 124 and the middle position of the linear sliding slot 125, respectively (see fig. 4B).

Therefore, the design of the screen rotation structure 1 of the present invention, the sliding bodies 131, 141, 151 of the first, second and third sliding groups 13, 14, 15 are three independent and all different axial centers, so that the sliding bodies 131, 141, 151 of the first, second and third sliding groups 13, 14, 15 in the rotation process of the combining member 11 can continuously change the position, so that the screen 2 on the combining member 11 is always at the most suitable height, and the screen 2 can be directly rotated and adjusted to any viewing angle to have the characteristics of vertical, horizontal and oblique adjustment, so that the screen 2 is not obstructed by a desktop 31 of the desk 3 when rotating, and the operation convenience is effectively achieved. So the utility model discloses effectively improve and must in advance go up the height that screen 2 rotation can not hit the desktop to the high up-regulation of support frame that supports screen 2 when knowing screen 2 is rotatory, could carry out the problem of the rotatory adjustment of screen 2.

Claims (9)

1. A screen rotation structure for connecting a screen, the screen rotation structure comprising:

a combining piece, which is provided with a connecting side and a combining side respectively positioned at two sides of the combining piece, wherein the connecting side is connected with a rear side of the screen, and the combining side is provided with a first combining part, a second combining part and a third combining part;

the bearing body is provided with a sliding groove part corresponding to the combination side of the combination part, the sliding groove part comprises a first arc-shaped sliding groove, the first arc-shaped sliding groove extends from the right side of a virtual vertical central line of the bearing body to the left side of the virtual vertical central line to form a tail end, a second arc-shaped sliding groove is arranged on the left side of the tail end of the first arc-shaped sliding groove, a straight sliding groove is arranged on the right side of the tail end of the first arc-shaped sliding groove, the second arc-shaped sliding groove extends from the lower side of a virtual horizontal central line of the bearing body to the upper side of the virtual horizontal central line, and the straight sliding groove extends upwards from the upper side of the first arc-shaped sliding groove; and

and the first sliding group and the second sliding group can respectively slide along the arc extending direction of the first arc-shaped sliding groove and the second arc-shaped sliding groove and slide in the linear sliding groove, so that each combining part slides along each corresponding sliding group to drive the screen to rotate.

2. The screen rotation structure of claim 1, wherein: the first sliding group, the second sliding group and the third sliding group are respectively provided with a sliding body and a connecting piece, the sliding bodies of the first sliding group, the second sliding group and the third sliding group are respectively provided with a sliding body outer side which is arranged in the first arc-shaped sliding groove, the second arc-shaped sliding groove and the linear sliding groove, each sliding body is provided with a sliding body through hole, the connecting pieces of the first sliding group and the second sliding group respectively penetrate through the sliding body through holes of the first sliding group and the second sliding group and are connected with the first combining part and the second combining part, and the connecting piece of the third sliding group is connected with one end of the third combining part penetrating through the third sliding body.

3. The screen rotation structure of claim 2, wherein: the third sliding group is further provided with a pair of sliding rails and a moving plate, the pair of sliding rails are arranged on the rear side of the bearing body and are adjacent to two sides of the linear sliding groove, the moving plate is connected to the pair of sliding rails in a crossing mode and is provided with an opening penetrating through two sides of the moving plate, and the opening is combined with one end of the sliding body of the third sliding group.

4. A screen rotation structure as defined in claim 3, wherein: an elastic piece is arranged between the pair of slide rails of the third slide group, is arranged on the top side close to the bearing body and is positioned above the linear chute to be connected with the moving plate.

5. The screen rotation structure of claim 4, wherein: the elastic element is a constant force spring.

6. The screen rotation structure of claim 1, wherein: the combining part is a frame or a screen back frame.

7. The screen rotation structure of claim 1, wherein: still contain a box body and a base, this box body and base are established in the bottom of this box body, and this box body is equipped with an enclosing cover, and this enclosing cover lid closes on a frame portion, has a accommodation space in this frame portion, supplies to place this and bears the weight of the body, and is equipped with plural fluting in the bottom side of this frame portion, and this plural fluting corresponds respectively to first arc spout, second arc spout and this sharp spout.

8. The screen rotation structure of claim 2, wherein: the first sliding set is further provided with a linkage part and a propping part, the linkage part and the propping part are arranged on the linkage part, one end of the linkage part is connected with the outer side of the sliding body of the first sliding set, and the other end of the linkage part is pivoted on the bearing body.

9. The screen rotation structure of claim 8, wherein: the bearing body is provided with a pair of stopping parts which are arranged at the front side of the bearing body and are respectively positioned at the front end adjacent to the first arc-shaped sliding groove and the lower side of the tail end.

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