A damping mechanism with two-sided dampers and a hinge

Abstract

This utility model belongs to the field of hinge technology, specifically disclosing a buffer mechanism and hinge with dampers on both sides, including a base, a connecting rod, a transmission component, and an elastic component. The base has a guide groove and two receiving grooves on both sides of the guide groove. The guide groove is connected to the receiving grooves on both sides. In the front-back direction, the elastic component can provide a backward elastic force to the connecting rod, allowing the connecting rod to move within the guide groove. One end of the connecting rod passes through the inner wall of the guide groove. The transmission component is slidably disposed at the connection between the guide groove and the receiving groove. Dampers are provided in both receiving grooves. One end of the damper can abut against one side of the transmission component, and the other end of the connecting rod can abut against the other side of the transmission component. The other side of the transmission component faces away from the damper, thereby buffering the door and preventing the door from shaking or colliding and generating noise.

Description

Technical Field

[0001] This utility model relates to the field of hinge technology, and in particular to a buffer mechanism and hinge with dampers on both sides. Background Technology

[0002] Hinges are commonly used to connect the cabinet body and doors of wardrobes or cabinets, enabling the doors to open and close. As people's pursuit of quality of life and home products continues to increase, they are increasingly inclined towards products that are exquisite and compact. Traditional hinges typically use a combination of torsion springs and dampers to achieve automatic, slow closing of the door. However, adding a torsion spring increases the overall size of the hinge, resulting in a thicker hinge.

[0003] For example, the utility model patent with authorization announcement number CN219864588U specifically discloses a hinge structure with bidirectional buffer. According to its disclosure and the accompanying drawings, the damping component consists of a hydraulic damper and a spring connected in series. The structure is simple and compact, easy to install, simplifies the installation process of the hydraulic damper and the spring, and also reduces the installation size of the damper in the width direction, which is conducive to the compact design of the hinge, and the hinge as a whole looks thinner.

[0004] In the aforementioned patent, the hydraulic damper can achieve a two-way buffering effect. However, in some application scenarios, such as when the door is opened to 90° or when it is about to close, when the door is heavy, the door's inertia is also large. The damping force provided by the hinge is insufficient, causing the door to move too fast, resulting in the door shaking or the door colliding with the cabinet, generating noise. Utility Model Content

[0005] In order to overcome the defects of the existing technology, this utility model provides a buffer mechanism and hinge with dampers on both sides to solve the problem of door shaking or relative collision between the door and the cabinet.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a buffer mechanism with dampers on both sides, including a base, a connecting rod, a transmission component, and an elastic component. The base has a guide groove and two receiving grooves on both sides of the guide groove. The guide groove is connected to the receiving grooves on both sides. In the front-back direction, the elastic component can give the connecting rod a backward elastic force. The connecting rod can move in the guide groove. One end of the connecting rod passes through the inner wall of the guide groove. The transmission component is slidably disposed at the connection between the guide groove and the receiving groove. Dampers are provided in both receiving grooves. One end of the damper can abut against one side of the transmission component, and the other end of the connecting rod can abut against the other side of the transmission component. The other side of the transmission component is away from the damper.

[0007] As a further embodiment, the connecting rod includes a rod portion and an anti-detachment portion fixed to one end of the rod portion. The end of the rod portion away from the anti-detachment portion passes through the inner wall of the guide groove. The anti-detachment portion can abut against the other side of the transmission member. The elastic element is a spring, which is sleeved on the rod portion. One end of the spring abuts against the inner wall of the guide groove, and the other end of the spring abuts against the anti-detachment portion.

[0008] As a further embodiment, the transmission component includes a first abutting portion, guide portions fixed on both sides of the first abutting portion, and second abutting portions respectively fixed to one end of the guide portions on both sides. The second abutting portions on both sides are respectively placed in the receiving grooves on both sides. The anti-detachment portion can abut against the first abutting portion, and one end of the damper on both sides can abut against the second abutting portions on both sides respectively.

[0009] As a further embodiment, the second abutment portion is located away from the first abutment portion.

[0010] As a further embodiment, a clearance groove is formed between the first abutting part and the guide parts on both sides, one end of the guide groove is placed in the clearance groove, and the two side walls of the guide groove are respectively slidably engaged with the two side walls of the clearance groove.

[0011] As a further embodiment, the buffer mechanism further includes a movable plate and a fixed plate. The movable plate is located between the fixed plate and the base. The movable plate can seal the guide groove and the receiving grooves on both sides. A first eccentric wheel is provided between the movable plate and the fixed plate. The bottom of the first eccentric wheel is riveted to the fixed plate. A first oblong hole is provided on the movable plate to cooperate with the first eccentric wheel, so that the movable plate can move in the vertical direction relative to the fixed plate. A second eccentric wheel is provided between the movable plate and the base. The bottom of the second eccentric wheel is riveted to the movable plate. A second oblong hole is provided on the base to cooperate with the second eccentric wheel, so that the base can move in the front-back direction relative to the movable plate.

[0012] As a further embodiment, both ends of the fixed plate are fixed with guide hooks, and both ends of the movable plate are respectively engaged in the guide hooks at both ends of the fixed plate, so that the movable plate remains stationary relative to the fixed plate in the front-back and left-right directions, and can slide relative to the fixed plate in the up-down direction.

[0013] This utility model also provides a hinge, including the above-mentioned buffer mechanism with dampers on both sides, and further including a hinge cup and a hinge arm. One end of the hinge arm is connected and fixed to the base, and the other end of the hinge arm is hinged to the hinge cup through a first hinge member and a second hinge member respectively. One end of the connecting rod passing through the inner wall of the guide groove is hinged to the middle of the second hinge member through a third hinge member, so that the connecting rod can move relative to the base in the front-back direction.

[0014] The beneficial effects of this utility model are as follows: A guide groove and two receiving grooves are provided on both sides of the guide groove on the base. Each receiving groove contains a damper. One end of the damper abuts against one side of the transmission component, and the other end of the connecting rod abuts against the other side of the transmission component, with the other side of the transmission component facing away from the damper. The dampers in the receiving grooves transmit damping force to the connecting rod through the same transmission component, thereby giving the connecting rod a greater damping force. This allows the connecting rod to bear the moving inertia of the door, achieving buffering of the door and preventing the door from shaking or colliding and generating noise. Attached Figure Description

[0015] Figure 1 This is a perspective view (a) of Embodiment 1 of the present utility model; Figure 2 This is a perspective view (II) of Embodiment 1 of the present utility model (lacking a fixing piece); Figure 3 This is a perspective view (three) of Embodiment 1 of the present utility model (lacking fixed piece and movable piece); Figure 4 This is a perspective view of the base in Embodiment 1 of this utility model; Figure 5 This is a perspective view of the transmission component in Embodiment 1 of this utility model; Figure 6 This is a perspective view of Embodiment 2 of the present invention; Figure 7 This is a top view of Embodiment 2 of the present invention; Figure 8 This is an exploded view of Embodiment 2 of this utility model; Figure 9 This is a cross-sectional view of Embodiment 2 of the present invention at the second eccentric wheel; Figure 10 This is a cross-sectional view of Embodiment 2 of the present invention at the first eccentric wheel; Figure 11 This is a schematic diagram illustrating the application of Embodiment 2 of this utility model.

[0016] In the diagram, 1-base, 11-guide groove, 12-accommodating groove, 13-slot, 14-second waist-shaped hole, 2-connecting rod, 21-anti-detachment part, 22-rod part, 3-transmission component, 31-first abutment part, 32-guide part, 33-second abutment part, 34-avoiding groove, 4-elastic component, 41-damper, 5-moving piece, 51-first waist-shaped hole, 52-protruding plate, 53-slotting protrusion, 6-fixing piece, 61-guide hook, 7-first eccentric wheel, 71-second eccentric wheel, 8-hinge cup, 81-hinge arm, 9-first hinge component, 91-second hinge component, 92-third hinge component, 10-cabinet body, 101-door body. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] Example 1 As attached Figure 1-4 As shown, this embodiment provides a buffer mechanism with dampers on both sides, including a base 1, a connecting rod 2, a transmission component 3, and an elastic component 4. The base 1 has a guide groove 11 and two receiving grooves 12 on both sides of the guide groove 11. The guide groove 11 is connected to the two receiving grooves 12 on both sides. In the front-back direction, the elastic component 4 can give the connecting rod 2 a spring force in the rearward direction. The connecting rod 2 can move in the guide groove 11, and one end of the connecting rod 2 passes through the inner wall of the guide groove 11.

[0020] As attached Figure 3-4 As shown, the transmission component 3 is slidably disposed at the connection between the guide groove 11 and the receiving groove 12. A damper 41 is provided in each of the two receiving grooves 12, with at least one damper 41 placed in each side. In this embodiment, it is preferable to place only one. The damper 41 can be a hydraulic damper 41. One end of the damper 41 can abut against one side of the transmission component 3, and the other end of the connecting rod 2 can abut against the other side of the transmission component 3. The other side of the transmission component 3 faces away from the damper 41. Specifically, the dampers 41 in the two receiving grooves 12 are mirror-symmetrical about the connecting rod 2 as the center line, meaning that the dampers 41 in the two receiving grooves 12 transmit the damping force to the connecting rod 2 through the same transmission component 3. In actual installation, the cylinder of the damper 41 abuts against the groove wall of the receiving groove 12, while the piston rod of the damper 41 abuts against the transmission component 3. Reversed installation is also possible. Compared to existing technologies with only one damper, this embodiment provides greater damping force to the link 2, thereby enabling the link 2 to bear the moving inertia of the door and preventing the door 101 from shaking or colliding and generating noise.

[0021] In this embodiment, a guide groove 11 and two receiving grooves 12 are provided on both sides of the guide groove 11. Each receiving groove 12 contains a damper 41. One end of the damper 41 abuts against one side of the transmission member 3, and the other end of the connecting rod 2 abuts against the other side of the transmission member 3. The other side of the transmission member 3 faces away from the damper 41. The dampers 41 in the two receiving grooves 12 transmit damping force to the connecting rod 2 through the same transmission member 3, thereby giving the connecting rod 2 a greater damping force. This allows the connecting rod 2 to bear the moving inertia of the door, achieving buffering of the door 101 and preventing the door 101 from shaking or colliding and generating noise.

[0022] Furthermore, if the transmission component 3 is directly connected and fixed to the connecting rod 2, the movement of the transmission component 3 during the forward movement of the connecting rod 2 would be limited by the corresponding internal space design, thus restricting the travel of the connecting rod 2. Therefore, the transmission component 3 is slidably positioned at the connection between the guide groove 11 and the receiving groove 12. The transmission component 3 is an independent transmission part and is not directly connected and fixed to the connecting rod 2. Instead, the damper 41 resets and pushes the transmission component 3, causing it to abut against the connecting rod 2. When the transmission component 3 abuts against one end of the guide groove 11, the connecting rod 2 can still move forward unrestricted.

[0023] In some embodiments, as shown in the appendix Figure 3 As shown, the connecting rod 2 includes a rod portion 22 and an anti-detachment portion 21 fixed to one end of the rod portion 22. The end of the rod portion 22 away from the anti-detachment portion 21 passes through the inner wall of the guide groove 11. The anti-detachment portion 21 can abut against the other side of the transmission member 3. The elastic member 4 is a spring, which is sleeved on the rod portion 22. One end of the spring abuts against the inner wall of the guide groove 11, and the other end of the spring abuts against the anti-detachment portion 21. Specifically, the anti-detachment portion 21 can be connected and fixed to the rod portion 22 by integral molding or welding. Its main function is to prevent the spring from detaching from the rod portion 22 and compressing the spring. Therefore, the anti-detachment portion 21 can be designed as a circular plate or a sphere, preferably a circular plate, which can save materials while cooperating with the rod portion 22 to move stably in the guide groove 11.

[0024] Among them, as attached Figure 3 As shown, one end of the spring abuts against the inner wall of the guide groove 11, and the other end abuts against the anti-detachment part 21. Specifically, the diameter of the anti-detachment part 21 is larger than the diameter of the spring. Therefore, when the connecting rod 2 moves within the guide groove 11, the anti-detachment part 21 moves in conjunction with the rod part 22 to compress the spring or cause the spring to return to its original position. For example, when the connecting rod 2 moves forward, the anti-detachment part 21 compresses the spring, generating a rearward elastic force on the connecting rod 2 through spring compression. During the spring's return to its original position, the connecting rod 2 moves backward under the action of the rearward elastic force.

[0025] In some embodiments, the elastic element 4 is a tension spring. One end of the tension spring is fixed to the connecting rod 2, and the other end is fixed to the groove arm of the receiving groove 12. The tension spring passes through the transmission element 3, meaning it is located between the two dampers 41. When the connecting rod 2 moves forward, it pulls the tension spring, which then exerts a rearward elastic force on the connecting rod 2. During the spring's return to its original position, the connecting rod 2 moves backward under the action of the rearward elastic force.

[0026] Furthermore, as one embodiment, as shown in the appendix Figure 3-5 As shown, the transmission component 3 includes a first abutment portion 31, guide portions 32 fixed on both sides of the first abutment portion 31, and second abutment portions 33 respectively fixed to one end of the guide portions 32 on both sides. Preferably, the guide portions 32 on both sides are perpendicular to the first abutment portion 31, and the second abutment portions 33 are perpendicular to the guide portions 32, and the first abutment portion 31, guide portions 32, and second abutment portions 33 are integrally formed. The second abutment portions 33 on both sides are respectively placed in the receiving grooves 12 on both sides. The anti-detachment portion 21 can abut against the first abutment portion 31, and one end of the damper 41 on both sides can abut against the second abutment portions 33 on both sides respectively. The second abutment portions 33 are far away from the first abutment portion 31. This design can save space inside the buffer mechanism, thereby making the buffer mechanism smaller and giving the transmission component 3 a longer travel. Furthermore, the damping force of the dampers 41 on both sides acts on the second abutment part 33 on both sides, and then transmits the damping force to the anti-detachment part 21 and the rod part 22 through the first abutment part 31 in the middle. Through this design, the connecting rod 2 is given a greater damping force and the connecting rod 2 is more stable under force.

[0027] Furthermore, as attached Figure 3 , 5 As shown, a clearance groove 34 is formed between the first abutment portion 31 and the guide portions 32 on both sides. One end of the guide groove 11 is placed in the clearance groove 34, and the anti-detachment portion 21 at one end of the rod portion 22 can move within the clearance groove 34, thereby increasing the travel of the connecting rod 2. The two side walls of the guide groove 11 slide in conjunction with the two side walls of the clearance groove 34, respectively, to provide guidance, thereby enabling the transmission component 3 to slide stably in the front-back direction, and making the damping force output of the damper 41 more stable.

[0028] Further details are attached. Figure 4 , 8As shown, the buffer mechanism also includes a movable plate 5 and a fixed plate 6. The movable plate 5 is located between the fixed plate 6 and the base 1. The movable plate 5 can seal the guide groove 11 and the two side receiving grooves 12, thereby preventing the connecting rod 2, the damper 41, and the transmission component 3 from detaching from the guide groove 11 and the receiving groove 12. In the actual installation process, two symmetrical protrusions 52 can be set on the movable plate 5 in the direction perpendicular to the movable plate 5. A locking protrusion 53 is integrally formed on the outer surface of the two protrusions 52, and a locking groove 13 is opened in the base 1. By extending the protrusions 52 into the base 1, the locking protrusions 53 can be inserted into the locking groove 13, thereby fixing the movable plate 5 to the base 1 together, thereby preventing the connecting rod 2, the transmission component 3, and the damper 41 from detaching from the guide groove 11 and the receiving groove 12.

[0029] As attached Figure 10 As shown, a first eccentric wheel 7 is provided between the movable piece 5 and the fixed piece 6. The bottom of the first eccentric wheel 7 is riveted to the fixed piece 6, which allows the first eccentric wheel 7 to rotate relative to the fixed piece 6 and also creates an interaction force between the fixed piece 6 and the movable piece 5. The movable piece 5 has a first oblong hole 51 that matches the first eccentric wheel 7. The first eccentric wheel 7 rotates within the first oblong hole 51, allowing the movable piece 5 to move vertically relative to the fixed piece 6, while the fixed piece 6 is fixed to the inner wall of the cabinet 10.

[0030] As attached Figure 9 As shown, a second eccentric wheel 71 is provided between the movable piece 5 and the base 1. The bottom of the second eccentric wheel 71 is riveted to the movable piece 5, which allows the second eccentric wheel 71 to rotate relative to the movable piece 5 and also creates an interaction force between the base 1 and the movable piece 5. The base 1 has a second oblong hole 14 that mates with the second eccentric wheel 71. The second eccentric wheel 71 rotates within the second oblong hole 14, allowing the base 1 to move relative to the movable piece 5 in the front-back direction.

[0031] As an improvement, see attached Figure 1 , 8 As shown, guide hooks 61 are fixed at both ends of the fixed plate 6, and the two ends of the movable plate 5 are respectively locked in the guide hooks 61 at both ends of the fixed plate 6, so that the movable plate 5 keeps its position relative to the fixed plate 6 in the front-back and left-right directions, forming a more stable whole. The movable plate 5 can slide relative to the fixed plate 6 in the up-down direction, thereby allowing the base 1 to slide relative to the fixed plate 6 in the up-down direction.

[0032] Example 2 As attached Figure 6-10As shown, this embodiment provides a hinge, including a buffer mechanism with dampers 41 on both sides as in Embodiment 1, and also includes a hinge cup 8 and a hinge arm 81. The hinge cup 8 is fixed to the door body 101, and one end of the hinge arm 81 is connected and fixed to the base 1, preferably by welding. The other end of the hinge arm 81 is hinged to the hinge cup 8 through a first hinge member 9 and a second hinge member 91, respectively. Specifically, one end of the first hinge member 9 and the second hinge member 91 is hinged to the hinge arm 81 through a pin, and the other end of the first hinge member 9 and the second hinge member 91 is hinged to the hinge cup 8 through a pin. One end of the connecting rod 2, which passes through the inner wall of the guide groove 11, is hinged to the middle of the second hinge member 91 through a third hinge member 92, so that the connecting rod 2 can move relative to the base 1 in the front-back direction. Specifically, one end of the third hinge 92 is hinged to the end of the connecting rod 2 that passes through the inner wall of the guide groove 11 via a pin, and the other end of the third hinge 92 is hinged to the middle of the second hinge 91 via a pin, so that the hinge cup 8 can swing relative to the base 1 to realize the opening and closing of the door 101.

[0033] Furthermore, as attached Figure 11 As shown, during the opening and closing of the door 101, the connecting rod 2 and the base 1 move relative to each other in the front-back direction. When the door 101 is opened, the hinge cup 8 pulls the connecting rod 2 forward, thereby compressing the spring or stretching the tension spring. The spring or tension spring generates a rearward elastic force on the connecting rod 2, which is the closing force on the door 101. At the same time, the damper 41 resets and pushes the transmission component 3, causing the transmission component 3 to abut against the connecting rod 2. Generally, after the door 101 is positioned, it will continue to open more than 90° and sway due to inertia. When the door 101 is fully opened more than 90°, the hinge cup 8 continues to pull the base 1 forward through the first connecting component and the hinge arm 81, which in turn drives the damper 41 on the base 1 to move forward. The damping force of the damper 41 is transmitted to the hinge cup 8 through the transmission component 3, the connecting rod 2, the third hinge component 92, and the second hinge component 91, thereby buffering the door 101 and preventing the door 101 from continuing to sway. When the door 101 is closing, the elastic element 4 returns to its original state, generating a backward elastic force on the connecting rod 2, pulling the connecting rod 2 to move backward. Finally, the connecting rod 2 abuts against the transmission element 3, and the transmission element 3 abuts against the damper 41, achieving a buffering effect.

[0034] The hinge of this invention can achieve a buffering effect when opening and closing the door 101, thus enabling bidirectional buffering.

[0035] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A buffer mechanism with dampers on both sides, characterized in that: The device includes a base (1), a connecting rod (2), a transmission component (3), and an elastic component (4). The base (1) has a guide groove (11) and two receiving grooves (12) on both sides of the guide groove (11). The guide groove (11) is connected to the two receiving grooves (12) on both sides. In the front-back direction, the elastic component (4) can give the connecting rod (2) a backward elastic force. The connecting rod (2) can move in the guide groove (11). One end of the connecting rod (2) passes through the inner wall of the guide groove (11). The transmission component (3) is slidably disposed at the connection between the guide groove (11) and the receiving groove (12). A damper (41) is provided in each of the two receiving grooves (12). One end of the damper (41) can abut against one side of the transmission component (3). The other end of the connecting rod (2) can abut against the other side of the transmission component (3). The other side of the transmission component (3) is away from the damper (41).

2. A buffer mechanism with dampers on both sides according to claim 1, characterized in that: The connecting rod (2) includes a rod portion (22) and an anti-detachment portion (21) fixed to one end of the rod portion (22). The end of the rod portion (22) away from the anti-detachment portion (21) passes through the inner wall of the guide groove (11). The anti-detachment portion (21) can abut against the other side of the transmission member (3). The elastic member (4) is a spring. The spring is sleeved on the rod portion (22). One end of the spring abuts against the inner wall of the guide groove (11), and the other end of the spring abuts against the anti-detachment portion (21).

3. A buffer mechanism with dampers on both sides according to claim 2, characterized in that: The transmission component (3) includes a first abutting part (31), guide parts (32) fixed on both sides of the first abutting part (31), and second abutting parts (33) fixed on one end of the guide parts (32) on both sides respectively. The second abutting parts (33) on both sides are respectively placed in the receiving grooves (12) on both sides. The anti-detachment part (21) can abut against the first abutting part (31), and one end of the damper (41) on both sides can abut against the second abutting parts (33) on both sides respectively.

4. A buffer mechanism with dampers on both sides according to claim 3, characterized in that: The second abutting part (33) is away from the first abutting part (31).

5. A buffer mechanism with dampers on both sides according to claim 3, characterized in that: An air-avoiding groove (34) is formed between the first abutting part (31) and the guide parts (32) on both sides. One end of the guide groove (11) is placed in the air-avoiding groove (34), and the two side walls of the guide groove (11) slide in cooperation with the two side walls of the air-avoiding groove (34).

6. A buffer mechanism with dampers on both sides according to claim 1, characterized in that: The buffer mechanism further includes a movable piece (5) and a fixed piece (6). The movable piece (5) is located between the fixed piece (6) and the base (1). The movable piece (5) can seal the guide groove (11) and the receiving grooves (12) on both sides. A first eccentric wheel (7) is provided between the movable piece (5) and the fixed piece (6). The bottom of the first eccentric wheel (7) is riveted to the fixed piece (6). A first waist-shaped hole (51) that matches the first eccentric wheel (7) is provided on the movable piece (5) so that the movable piece (5) can move in the vertical direction relative to the fixed piece (6). A second eccentric wheel (71) is provided between the movable piece (5) and the base (1). The bottom of the second eccentric wheel (71) is riveted to the movable piece (5). A second waist-shaped hole (14) that matches the second eccentric wheel (71) is provided on the base (1) so that the base (1) can move in the front-back direction relative to the movable piece (5).

7. A buffer mechanism with dampers on both sides according to claim 6, characterized in that: Both ends of the fixed plate (6) are fixed with guide hooks (61), and both ends of the movable plate (5) are respectively locked in the guide hooks (61) at both ends of the fixed plate (6) so that the movable plate (5) remains stationary relative to the fixed plate (6) in the front-back and left-right directions, and can slide relative to the fixed plate (6) in the up-down direction.

8. A hinge, characterized in that: The buffer mechanism with dampers on both sides according to any one of claims 1-7 further includes a hinge cup (8) and a hinge arm (81), one end of the hinge arm (81) is connected and fixed to the base (1), and the other end of the hinge arm (81) is hinged to the hinge cup (8) through a first hinge member (9) and a second hinge member (91), respectively. One end of the connecting rod (2) passing through the inner wall of the guide groove (11) is hinged to the middle of the second hinge member (91) through a third hinge member (92), so that the connecting rod (2) can move relative to the base (1) in the front-back direction.

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