A buried hinge hovering opening structure

Abstract

The invention relates to an embedded hinge suspended opening structure, comprising a hinge arm assembly, an elastic assembly, a hinge cup and a bracket; the hinge arm assembly comprises a first hinge arm; the elastic assembly comprises an elastic member and a support member; the first hinge arm is rotatably connected with the hinge cup and the bracket respectively, and a point A is formed between the first hinge arm and the bracket; an extension portion is provided on the first hinge arm, and a first action position of the hinge arm and a second action position of the hinge arm are provided on the extension portion; the elastic member elastically acts on the bracket and the support member respectively, and a point B is formed between the bracket; a supporting recess is provided on the support member, and the support member elastically acts on the extension portion through the elastic member, and interacts with the first action position of the hinge arm and the second action position of the hinge arm through the supporting recess when the first hinge arm rotates; a straight line X is formed between point A and point B; when the hinge cup is hinged and opened to a certain position, and the action position between the supporting recess and the first action position of the hinge arm or the second action position of the hinge arm is close to or located at the straight line X, the hinge cup is suspended and opened on the bracket, and the practicability is strong.

Description

Technical Field

[0001] The invention relates to an embedded hinge suspended opening structure. Background Art

[0002] Chinese patent document number CN212359432U disclosed on January 15, 2021, an embedded hinge, which includes a fixed seat with a built-in elastic transmission device, and a hinge cup that is hingedly opened and closed by a connecting arm assembly and the fixed seat, the connecting arm assembly includes a first connecting arm; the first connecting arm is provided with an elastic acting part that cooperates with the elastic transmission device; a rolling member is provided at the position where the elastic acting part cooperates with the elastic transmission device, and a first limiting assembly is respectively provided on the elastic acting part and the elastic transmission device, and a second limiting assembly is provided in the fixed seat, and the first limiting assembly and the second limiting assembly form a rolling area; during the opening and closing process of the hinge, the elastic acting part and the elastic transmission device respectively roll in contact with the rolling member, and the rolling member rolls on the rolling area, thereby solving the wear problem of parts caused by sliding contact. In actual use, when the hinge cup is opened and closed, the elastic transmission device generates a closing force and an opening force due to the rotation of the first connecting arm. When the hinge cup is opened, the closing force offsets the opening force due to the rolling action of the rolling element, causing the hinge cup to move in the closing direction when it is opened to a certain angle, or even reclose and accidentally injure the user, affecting the user's experience. Therefore, further improvements are necessary. Summary of the invention

[0003] The purpose of the present invention is to provide a buried hinge suspended opening structure to overcome the deficiencies in the prior art.

[0004] An embedded hinge suspended opening structure designed for this purpose includes a hinge cup and a bracket that are elastically hinged to each other through a hinge arm assembly and an elastic assembly, and is characterized in that: the hinge arm assembly includes at least a first hinge arm; the elastic assembly includes an elastic member and a support member.

[0005] The first hinge arm is rotatably connected to the hinge cup and the bracket respectively, and the rotation position between the first hinge arm and the bracket forms point A; an extension portion is arranged on the first hinge arm, and a first action position of the hinge arm and a second action position of the hinge arm are arranged on the extension portion.

[0006] The elastic member elastically acts on the bracket and the support member respectively, and the elastic action position between the elastic member and the bracket forms point B; a supporting recess is provided on the support member, and the support member elastically acts on the extension part through the elastic member, and interacts with the first action position of the hinge arm and the second action position of the hinge arm through the supporting recess when the first hinge arm rotates.

[0007] Among them, a straight line X is formed between point A and point B; when the hinge cup is hinged and opened to a certain position, the action position between the support recess and the first action position of the hinge arm, or the action position between the support recess and the second action position of the hinge arm is close to or located at the straight line X, the hinge cup is suspended and opened on the bracket.

[0008] The supporting concave part is concavely arranged on the supporting member, and a supporting convex part is convexly arranged on the outer side thereof; the first action position of the hinge arm and the second action position of the hinge arm are convexly and concavely arranged on the extension part respectively.

[0009] When the hinge cup is hinged and closed to a certain position relative to the bracket, the support recess elastically acts on the first action position of the hinge arm through the elastic member, and the elastic action positions of the two are located outside the X straight line, the elastic member generates a closing force on the first hinge arm through the support member, and drives the hinge cup to automatically hinge and close on the bracket.

[0010] When the hinge cup is hinged and opened to a certain position relative to the bracket, the support recess elastically acts on the first action position of the hinge arm through the elastic member, and when the elastic action positions of the two are close to or located at the X straight line, the hinge cup is suspended and opened on the bracket.

[0011] When the hinge cup continues to be hinged and opened relative to the bracket, the supporting concave portion and the first action position are separated from each other, and the two are respectively located on the inner side of the X straight line. The supporting convex portion elastically acts on the second action position of the hinge arm through the elastic member, and the elastic action positions of the two are close to or located on the X straight line. The hinge cup is always suspended and opened on the bracket.

[0012] One end of the first hinge arm is rotatably connected to the hinge cup, the middle part of the first hinge arm is rotatably connected to the bracket, and the rotational position between the two forms point A; the extension part is arranged at the other end of the first hinge arm; the first action position of the hinge arm and the second action position of the hinge arm are respectively arranged at the end positions of the extension part.

[0013] A step is formed between the first action position of the hinge arm and the second action position of the hinge arm, and the transition between them is arc-shaped or angular; when the hinge cup is hinged to open and close, the supporting concave portion and / or the supporting convex portion elastically acts on the first action position of the hinge arm and / or the second action position of the hinge arm through the elastic member.

[0014] The first action position of the hinge arm is convexly arranged in an arc shape at the end position of the extension part, and the second action position of the hinge arm is concavely arranged in an arc shape at the end position of the extension part, so that a high and low step is formed between the first action position of the hinge arm and the second action position of the hinge arm, wherein the first action position of the hinge arm and the second action position of the hinge arm transition to each other in an arc shape.

[0015] A positioning portion is provided at one end of the support member, and the support member is positioned on the elastic member through the positioning portion; the support recess is arc-shapedly recessed at the other end of the support member, and a support protrusion is convexly provided on its outer side; one end of the elastic member elastically acts on the bracket, and the elastic action position between the two forms point B, and the other end of the elastic member elastically acts on the support member; the elastic member and the support member rotate or swing with point B as the axis following the extension portion when the hinge cup is hinged to open and close.

[0016] A first avoidance portion is provided on the bracket, and a limiting portion is provided on the first avoidance portion; the elastic member and the support member are located in the first avoidance portion; one end of the elastic member is positioned on the limiting portion and elastically acts on the bracket, and the elastic member passes through the limiting portion and follows the extension portion to perform limited rotation or swing with point B as the axis when the hinge cup is hinged and opened and closed.

[0017] The hinge arm assembly also includes a second hinge arm, one end of which is rotatably connected to the hinge cup and the other end is rotatably connected to the bracket; the hinge cup is elastically hinged to open and close on the bracket through the cooperation of the first hinge arm, the second hinge arm, the elastic member and the support member.

[0018] A second avoidance portion is provided on the bracket, and a damper is provided in the second avoidance portion; a damping action portion is provided on the first hinge arm, and the damping action portion acts on the damper when the hinge cup is hinged and closed to a certain position relative to the bracket, and drives the damper to compress and generate a damping force, so as to realize the damped hinged closure of the hinge cup relative to the bracket.

[0019] The bracket is also provided with an assembly cover, which is fixedly arranged on the outside of the bracket and covers the bracket, the elastic transmission group, the entire damper, and at least a part of the first hinge arm.

[0020] The present invention improves the above structure, and is provided with a first action position of the hinge arm and a second action position of the hinge arm on the extension of the first hinge arm, and is provided with a supporting recess on the supporting member, so that the supporting recess can interact with the first action position of the hinge arm and the second action position of the hinge arm through the elastic member when the first hinge arm rotates, thereby realizing the elastic hinged opening and closing of the hinge cup, so that the hinge cup can be smoothly opened and closed on the bracket by translation; and, by forming point A by the rotation position between the first hinge arm and the bracket, and point B by the elastic action position between the elastic member and the bracket, an X line is formed between them, when the hinge cup is hinged and opened to a certain position, and at the same time, the action position between the supporting recess and the first action position of the hinge arm, or the action position between the supporting recess and the second action position of the hinge arm is close to or located at the X line, the hinge cup can be suspended and opened on the bracket, so as to avoid the problem that the hinge cup of the prior art will be displaced in the closing direction due to the influence of the reaction force when opening, or even re-closed to accidentally injure the user, so that the user can stop the opening of the hinge cup at any time during use, thereby improving the user experience and safety.

[0021] In general, it has the characteristics of simple and reasonable structure, excellent performance, low manufacturing cost, compact connection between components, smooth opening and closing, easy, safe and reliable use, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the assembly structure of an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the assembly structure after omitting the assembly cover according to an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the decomposed structure of an embodiment of the present invention.

[0025] Figure 4-Figure 7 Schematic diagram of the opening and closing process of the hinge cup according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] See also Figure 1-Figure 7 The embedded hinge suspended opening structure includes a hinge cup 1 and a bracket 2 which are elastically hinged to each other for opening and closing through a hinge arm assembly and an elastic assembly, and is characterized in that: the hinge arm assembly includes at least a first hinge arm 3; the elastic assembly includes an elastic member 4 and a support member 5.

[0028] The first hinge arm 3 is rotatably connected to the hinge cup 1 and the bracket 2 respectively, and the rotation position between the first hinge arm 3 and the bracket 2 forms point A; the first hinge arm 3 is provided with an extension part 6, and the extension part 6 is provided with a hinge arm first action position 7 and a hinge arm second action position 8.

[0029] The elastic member 4 elastically acts on the bracket 2 and the support member 5 respectively, and the elastic action position between the elastic member 4 and the bracket 2 forms point B; a supporting recess 9 is provided on the support member 5, and the support member 5 elastically acts on the extension portion 6 through the elastic member 4, and interacts with the first action position 7 of the hinge arm and the second action position 8 of the hinge arm through the supporting recess 9 when the first hinge arm 3 rotates.

[0030] Among them, a straight line X is formed between point A and point B; when the hinge cup 1 is hinged and opened to a certain position, the action position between the support recess 9 and the first action position 7 of the hinge arm, or the action position between the support recess 9 and the second action position 8 of the hinge arm is close to or located at the straight line X, the hinge cup 1 is suspended and opened on the bracket 2.

[0031] In this embodiment, a first hinge arm action position 7 and a second hinge arm action position 8 are arranged on the extension portion 6 of the first hinge arm 3, and a support recess 9 is arranged on the support member 5, so that the support recess 9 can interact with the first hinge arm action position 7 and the second hinge arm action position 8 through the elastic member 4 when the first hinge arm 3 rotates, thereby realizing the elastic hinged opening and closing of the hinge cup 1, so that the hinge cup 1 can be smoothly opened and closed on the bracket 2 by translation; and the rotation position between the first hinge arm 3 and the bracket 2 forms the A point, and the elastic action position between the elastic member 4 and the bracket 2 forms the An X-line is formed between points B. When the hinge cup 1 is hinged and opened to a certain position, and the working position between the supporting recess 9 and the first working position 7 of the hinge arm, or the working position between the supporting recess 9 and the second working position 8 of the hinge arm is close to or located at the X-line, the hinge cup 1 can be suspended and opened on the bracket 2, so as to avoid the problem that the hinge cup of the prior art will be displaced in the closing direction due to the influence of the reaction force when opening, or even close again and accidentally injure the user. The user can stop the opening of the hinge cup 1 at any time during use, thereby improving the user experience and safety.

[0032] Specifically, one end of the first hinge arm 3 is rotatably connected to the hinge cup 1, the middle part of the first hinge arm 3 is rotatably connected to the bracket 2, and the rotation position between the two forms point A; the extension part 6 is arranged at the other end of the first hinge arm 3; the first action position 7 of the hinge arm and the second action position 8 of the hinge arm are respectively arranged at the end positions of the extension part 6.

[0033] A step is formed between the first action position 7 of the hinge arm and the second action position 8 of the hinge arm, and the transition between them is arc-shaped or angular; when the hinge cup 1 is hinged to open and close, the supporting recess 9 elastically acts on the first action position 7 of the hinge arm and the second action position 8 of the hinge arm through the elastic member 4.

[0034] A positioning portion 10 is provided at one end of the support member 5, and the support member 5 is positioned and sleeved on the elastic member 4 through the positioning portion 10; the support recess 9 is arc-shapedly recessed at the other end of the support member 5, and a support protrusion 11 is convexly provided on its outer side; one end of the elastic member 4 elastically acts on the bracket 2, and the elastic action position between the two forms point B, and the other end of the elastic member 4 elastically acts on the support member 5; the elastic member 4 and the support member 5 rotate or swing with point B as the axis following the extension portion 6 when the hinge cup 1 is hinged to open and close.

[0035] A first avoidance portion 12 is provided on the bracket 2, and a limiting portion 13 is provided on the first avoidance portion 12; the elastic member 4 and the support member 5 are located in the first avoidance portion 12; one end of the elastic member 4 is positioned and sleeved on the limiting portion 13 and elastically acts on the bracket 2, and the elastic member 4 is limitedly rotated or swung along the extension portion 6 with point B as the axis through the limiting portion 13 when the hinge cup 1 is hinged to open and close.

[0036] The first action position 7 of the hinge arm is convexly arranged in an arc shape at the end position of the extension part 6, and the second action position 8 of the hinge arm is concavely arranged in an arc shape at the end position of the extension part 6, so that a high and low step is formed between the first action position 7 of the hinge arm and the second action position 8 of the hinge arm, wherein the first action position 7 of the hinge arm and the second action position 8 of the hinge arm transition to each other in an arc shape.

[0037] That is, there are arc-shaped transitions between the supporting recess 9 and the supporting protrusion 11, and between the first action position 7 of the hinge arm and the second action position 8 of the hinge arm. When the first hinge arm 3 is rotating, the transition between the supporting recess 9 and the first action position 7 of the hinge arm and the second action position 8 of the hinge arm, as well as the transition between the supporting protrusion 11 and the first action position 7 of the hinge arm and the second action position 8 of the hinge arm, can achieve unobstructed and smooth cooperation, further enabling the hinge cup 1 to open and close on the bracket 2 smoothly through translation.

[0038] When the hinge cup 1 is hinged and closed to a certain position relative to the bracket 2, the support recess 9 elastically acts on the first action position 7 of the hinge arm through the elastic member 4, and the elastic action positions of the two are located outside the X straight line, the elastic member 4 generates a closing force on the first hinge arm 3 through the support member 5, and drives the hinge cup 1 to automatically hinge and close on the bracket 2.

[0039] like Figure 4 As shown, the elastic action position between the support recess 9 and the first action position 7 of the hinge arm is located on the right side of the straight line X, and a triangle is formed between the elastic action position between the support recess 9 and the first action position 7 of the hinge arm and points A and B. At this time, the elastic member 4 will generate a closing force on the first hinge arm 3 through the support member 5, and the hinge cup 1 will always be automatically hinged and closed on the bracket 2.

[0040] When the hinge cup 1 is hinged and opened to a certain position relative to the bracket 2, the support recess 9 elastically acts on the first action position 7 of the hinge arm through the elastic member 4, and when the elastic action positions of the two are close to or located at the X straight line, the hinge cup 1 is suspended and opened on the bracket 2.

[0041] like Figure 5 As shown, the elastic action position between the support recess 9 and the first action position 7 of the hinge arm is located on the straight line X, the support protrusion 11 and the second action position 8 of the hinge arm are separated from each other, and the two are respectively located outside the straight line X. At this time, the elastic member 4 will generate a force on the point A through the support member 5, and the force is essentially without effect, so the hinge cup 1 will hover open on the bracket 2.

[0042] When the hinge cup 1 continues to be hinged and opened relative to the bracket 2, the supporting recess 9 and the first action position 7 are separated from each other, and the two are respectively located on the inner side of the X straight line, and the supporting protrusion 11 elastically acts on the second action position 8 of the hinge arm through the elastic member 4, and the elastic action positions of the two are close to or located on the X straight line, and the hinge cup 1 is always suspended and opened on the bracket 2.

[0043] like Figure 6 , Figure 7 As shown, the support recess 9 and the first action position 7 are separated from each other, and the two are respectively located on the inner side of the X straight line, and the elastic action position between the support protrusion 11 and the second action position 8 of the hinge arm is located on the X straight line. At this time, the elastic member 4 will generate a force on the point A through the support member 5, and the force is essentially without effect, so the hinge cup 1 will hover open on the bracket 2.

[0044] That is, the hinge cup 1 is Figure 5-Figure 7 At the opening angle, the hinge cup 1 can be in a hovering open state relative to the bracket 2. At the same time, since the second action position 8 of the hinge arm and the supporting concave portion 9 are arc-shaped, they can play a certain limiting role on the supporting convex portion 11 and the first action position 7 of the hinge arm, so as to prevent the elastic member 4 and the supporting member 5 from rotating or swinging after the hinge cup 1 is hovering and opened, and ensure that the hinge cup 1 can be in a hovering open state relative to the bracket 2.

[0045] The hinge arm assembly of this embodiment also includes a second hinge arm 14, one end of the second hinge arm 14 is rotatably connected to the hinge cup 1, and the other end is rotatably connected to the bracket 2; the hinge cup 1 is opened and closed on the bracket 2 through the coordinated elastic hinge of the first hinge arm 3, the second hinge arm 14, the elastic member 4 and the support member 5.

[0046] A second avoidance portion 15 is provided on the bracket 2, and a damper 16 is provided in the second avoidance portion 15; a damping action portion 17 is provided on the first hinge arm 3, and the damping action portion 17 acts on the damper 16 when the hinge cup is hinged and closed to a certain position relative to the bracket 2, and drives the damper 16 to compress and generate a damping force, so as to realize the damped hinged closure of the hinge cup 1 relative to the bracket 2.

[0047] The bracket 2 is also provided with an assembly cover 18 , which is fixedly arranged on the outside of the bracket 2 and covers the bracket 2 , the elastic transmission group, the entire damper 16 , and at least a part of the first hinge arm 3 .

[0048] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An embedded hinge suspended opening structure, comprising a hinge cup (1) and a bracket (2) which are elastically hinged to each other for opening and closing through a hinge arm assembly and an elastic assembly, characterized in that: The hinge arm assembly at least comprises a first hinge arm (3); the elastic assembly comprises an elastic member (4) and a support member (5); the first hinge arm (3) is rotatably connected to the hinge cup (1) and the bracket (2), respectively, and the rotation position between the first hinge arm (3) and the bracket (2) forms point A; an extension portion (6) is provided on the first hinge arm (3), and a first hinge arm action position (7) and a second hinge arm action position (8) are provided on the extension portion (6); the elastic member (4) elastically acts on the bracket (2) and the support member (5), respectively, and the elastic action position between the elastic member (4) and the bracket (2) forms point B; a support recess (9) is provided on the support member (5), and the support member (5) elastically acts on the extension portion (6) through the elastic member (4), and interacts with the first hinge arm action position (7) and the second hinge arm action position (8) through the support recess (9) when the first hinge arm (3) rotates; A straight line X is formed between point A and point B; when the hinge cup (1) is hinged and opened to a certain position, the action position between the support recess (9) and the first action position (7) of the hinge arm, or the action position between the support recess (9) and the second action position (8) of the hinge arm is close to or located at the straight line X, and the hinge cup (1) is suspended and opened on the bracket (2); The support recess (9) is concavely arranged on the support member (5), and a support protrusion (11) is convexly arranged on the outer side thereof; the first action position (7) of the hinge arm and the second action position (8) of the hinge arm are respectively convexly and concavely arranged on the extension portion (6); When the hinge cup (1) is hinged and closed to a certain position relative to the bracket (2), the support recess (9) elastically acts on the first action position (7) of the hinge arm through the elastic member (4), and the elastic action positions of the two are located outside the X straight line, the elastic member (4) generates a closing force on the first hinge arm (3) through the support member (5), and drives the hinge cup (1) to automatically hinge and close on the bracket (2); When the hinge cup (1) is hinged and opened to a certain position relative to the bracket (2), the support recess (9) elastically acts on the first action position (7) of the hinge arm through the elastic member (4), and the elastic action positions of the two are close to or located on the X straight line, the hinge cup (1) is suspended and opened on the bracket (2); When the hinge cup (1) continues to be hinged and opened relative to the bracket (2), the support recess (9) and the first action position (7) are separated from each other, and the two are respectively located on the inner side of the X straight line, and the support protrusion (11) elastically acts on the second action position (8) of the hinge arm through the elastic member (4), and the elastic action positions of the two are close to or located on the X straight line, and the hinge cup (1) is always suspended and opened on the bracket (2); A step is formed between the first action position (7) of the hinge arm and the second action position (8) of the hinge arm, and the transition between them is in an arc or angle shape; when the hinge cup (1) is hinged to open or close, the supporting concave portion (9) and / or the supporting convex portion (11) elastically acts on the first action position (7) of the hinge arm and / or the second action position (8) of the hinge arm through the elastic member (4).

2. According to claim 1, the embedded hinge suspended opening structure is characterized in that: One end of the first hinge arm (3) is rotatably connected to the hinge cup (1), the middle part of the first hinge arm (3) is rotatably connected to the bracket (2), and the rotational position between the two forms a point A; the extension part (6) is arranged at the other end of the first hinge arm (3); the first action position (7) of the hinge arm and the second action position (8) of the hinge arm are respectively arranged at the end positions of the extension part (6).

3. The embedded hinge suspended opening structure according to claim 2, characterized in that: The first action position (7) of the hinge arm is convexly arranged at the end position of the extension part (6) in an arc shape, and the second action position (8) of the hinge arm is concavely arranged at the end position of the extension part (6) in an arc shape, so that a step is formed between the first action position (7) of the hinge arm and the second action position (8) of the hinge arm, wherein the first action position (7) of the hinge arm and the second action position (8) of the hinge arm transition to each other in an arc shape.

4. The embedded hinge suspended opening structure according to claim 1, characterized in that: A positioning portion (10) is provided at one end of the support member (5), and the support member (5) is positioned and sleeved on the elastic member (4) through the positioning portion (10); a support recess (9) is recessed in an arc shape at the other end of the support member (5), and a support protrusion (11) is convexly provided on the outer side thereof; one end of the elastic member (4) elastically acts on the bracket (2), and the elastic acting position between the two forms a point B, and the other end of the elastic member (4) elastically acts on the support member (5); when the hinge cup (1) is hingedly opened or closed, the elastic member (4) and the support member (5) rotate or swing with the extension portion (6) around the point B as the axis.

5. The embedded hinge suspended opening structure according to claim 1, characterized in that: The bracket (2) is provided with a first avoidance portion (12), and a limiting portion (13) is provided on the first avoidance portion (12); the elastic member (4) and the support member (5) are located in the first avoidance portion (12); one end of the elastic member (4) is positioned and sleeved on the limiting portion (13) and elastically acts on the bracket (2); the elastic member (4) is limitedly rotated or swung by the limiting portion (13) with point B as the axis center following the extension portion (6) when the hinge cup (1) is hingedly opened or closed.

6. The embedded hinge suspended opening structure according to any one of claims 1 to 5, characterized in that: The hinge arm assembly also includes a second hinge arm (14), one end of the second hinge arm (14) is rotatably connected to the hinge cup (1), and the other end is rotatably connected to the bracket (2); the hinge cup (1) is opened and closed on the bracket (2) through the coordinated elastic hinge connection of the first hinge arm (3), the second hinge arm (14), the elastic member (4) and the support member (5).

7. The embedded hinge suspended opening structure according to claim 6, characterized in that: The bracket (2) is provided with a second avoidance portion (15), and a damper (16) is provided in the second avoidance portion (15); the first hinge arm (3) is provided with a damping action portion (17), and the damping action portion (17) acts on the damper (16) when the hinge cup is hinged and closed to a certain position relative to the bracket (2), and drives the damper (16) to compress and generate a damping force, so as to realize the damping hinge closure of the hinge cup (1) relative to the bracket (2); the bracket (2) is also provided with an assembly cover (18), and the assembly cover (18) is fixedly arranged on the outside of the bracket (2), and covers the bracket (2), the elastic transmission group, the entire damper (16), and at least a part of the first hinge arm (3).

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