Hinge with simple in-cup damping structure

Abstract

The hinge comprises a hinge cup, a hinge arm and a damper, the hinge arm is in transmission connection with the hinge cup through a connecting rod structure, one end of the damper abuts against the side wall of the hinge cup, a buffering groove is formed in the hinge cup, a sliding buckle and a tooth groove are arranged on the damper, the sliding buckle is arranged in the buffering groove in a sliding mode, and the tooth groove is arranged in the buffering groove. The connecting rod structure is provided with a tooth-shaped part, the tooth-shaped part is arranged on the upper side of the damper and can rotate relative to the damper, and when the hinge arm moves towards the side close to the hinge cup, the tooth-shaped part rotates to be meshed with the tooth groove and drives the damper to be compressed. Compared with the prior art, the tooth-shaped part is arranged on the hinge arm, and the tooth groove matched with the tooth-shaped part is formed in the damper, so that a gear and rack transmission structure is directly formed between the hinge arm and the damper, the transmission is stable and uniform, the response is quick, the overall structure is greatly simplified, and the dependence on a middle connecting piece is reduced; therefore, the transmission efficiency and reliability are improved, and meanwhile the manufacturing cost and the assembling complexity are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the hinge field, especially to a hinge with simple cup-in-damper structure. BACKGROUND

[0002] The current buffer hinge usually cannot realize the direct transmission connection between the damping and the hinge cup, and needs to pass through a series of intermediate connecting pieces to transmit the rotation of the hinge cup to the damping to drive its linear motion to realize the buffering function. However, such a structure for motion conversion and transmission through complex connecting pieces is easy to cause problems such as motion trajectory distortion and uneven buffering speed in the closing process. The gear and rack transmission, as a transmission mode that can convert rotary motion into linear motion, is especially suitable for hinge transmission, and it has the advantages of rapid transmission response and uniform and smooth motion, which is mainly due to the uniformity of the gear teeth distribution. However, if the gear and rack transmission is directly applied to the hinge, the gear structure needs to be provided on both the damping and the hinge arm, resulting in an increase in the number of parts and a complex structure, which is difficult to meet the current market requirements for structure simplification.

[0003] According to the above, the existing hinge needs to be further improved. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a hinge with simple cup-in-damper structure, which sets a tooth-shaped part on the hinge arm and a corresponding tooth groove on the damping to directly form a gear and rack transmission between the hinge arm and the damping, which is uniform and rapid in transmission and simple in overall structure.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a hinge with simple cup-in-damper structure, comprising a hinge cup, a hinge arm and a damping, the hinge arm is in transmission connection with the hinge cup through a connecting rod structure, one end of the damping abuts against the side wall of the hinge cup, a buffer groove is formed on the hinge cup, a slide buckle and a tooth groove are provided on the damping, the slide buckle is slidably arranged in the buffer groove, a tooth-shaped part is provided on the connecting rod structure, the tooth-shaped part is arranged on the upper side of the damping and can rotate relative to the damping, when the hinge arm moves towards the side close to the hinge cup, the tooth-shaped part rotates to engage with the tooth groove and drives the damping to compress.

[0006] Compared with the prior art, the present application sets a tooth-shaped part on the hinge arm and a tooth groove on the damping at the same time, so that a gear and rack transmission structure is directly formed between the hinge arm and the damping, which not only has stable and uniform transmission and rapid response, but also greatly simplifies the overall structure, reduces the dependence on intermediate connecting pieces, thereby improving the transmission efficiency and reliability, and reducing the manufacturing cost and assembly complexity.

[0007] Preferably, the tooth-shaped part has a tooth on the outer side wall, which is matched with the tooth groove. When the tooth-shaped part rotates to the tooth engaging with the tooth groove, the damping moves to the side close to or away from the hinge arm with the rotation of the tooth-shaped part, thereby compressing or restoring the damping. In the open state of the hinge, the tooth is disengaged from the tooth groove, and the tooth groove is on the rotation track of the tooth. When the hinge is converted from the open state to the closed state, the connecting rod structure drives the tooth-shaped part to rotate, the tooth first engages with the tooth groove, and then the damping moves to the side where the damping abuts against the hinge cup through the tooth groove, so that the damping is compressed to buffer the movement of the hinge. When the hinge is converted from the closed state to the open state, the tooth drives the damping to move away from the side where the damping abuts against the hinge cup through the engagement with the tooth groove, and the damping is gradually restored until the tooth is disengaged from the tooth groove.

[0008] Preferably, the sliding buckle includes a fixed part and a reverse buckle extending outward from both sides of the fixed part. The outer side of the reverse buckle is provided with an inclined surface, so that the width of the reverse buckle gradually decreases from top to bottom. A deformation groove is formed between the two reverse buckles. The reverse buckle enables the damping to be quickly assembled with the hinge cup. The sliding buckle is aligned with the buffer groove and then pressed down. The deformation groove is used to reserve the deformation space during the installation of the reverse buckle.

[0009] Preferably, the damping further includes a base, a plug cylinder and a plug rod. The plug cylinder is arranged on the upper side of the base. One end of the plug rod is movably arranged in the plug cylinder, and the other end abuts against the side wall of the hinge cup. The sliding buckle is arranged on the lower side of the base. The upper wall surface of the base is concave to form the tooth groove.

[0010] Preferably, the connecting rod structure includes a first connecting rod and a second connecting rod arranged on the lower side of the first connecting rod. One end of the first connecting rod is hingedly connected with the hinge arm through a first hinge joint, and the other end is hingedly connected with the hinge cup through a third hinge joint. One end of the second connecting rod is hingedly connected with the hinge arm through a second hinge joint, and the other end is hingedly connected with the hinge cup through a fourth hinge joint. The tooth-shaped part is arranged on the first connecting rod. Through the hinge connection with the hinge arm and the hinge cup, the first connecting rod and the second connecting rod transmit the movement of the hinge arm to the hinge cup and the damping.

[0011] Preferably, it further includes a torsional spring. The torsional spring is hingedly connected with the first connecting rod and the hinge arm through the first hinge joint. The torsional arm of the torsional spring abuts against the upper side of the second connecting rod. The torsional spring always applies an elastic force to the second connecting rod, so that the second connecting rod remains stable in the static state, thereby the hinge remains stable in the open or closed state.

[0012] Preferably, the hinge arm includes a mounting seat and an upper cover. The upper cover covers the upper part of the mounting seat. The upper wall surface of the mounting seat is provided with an open-ended assembly groove. The upper cover is provided with a push block. The push block is slidably arranged in the assembly groove. The first hinge joint and the second hinge joint are arranged on the upper cover. The upper cover can be slid into the assembly groove through the push block, thereby being assembled on the mounting seat.

[0013] Preferably, a limiting post is arranged between the two side walls of the upper cover, and the limiting post is arranged at one side of the second connecting rod and the hinge arm.

[0014] Preferably, the upper cover is provided with a one-way open decorative cover, and the upper wall of the upper cover is provided with a bayonet, and the side wall of the decorative cover extends inwardly and downwardly with a clamping tongue, and the clamping tongue is clamped on the bayonet.

[0015] Preferably, the hinge cup is provided with a "U"-shaped first fixing pin and a second fixing pin, the first fixing pin comprises a first pin leg passing through the third hinge joint and being hinged with the first connecting rod, and a second pin leg passing through the side wall of the hinge cup, the second fixing pin comprises a third pin leg passing through the third hinge joint and being hinged with the first connecting rod, and a fourth pin leg arranged on the fourth hinge joint and being hinged with one end of the second connecting rod; the first fixing pin is used for fixing the hinged position of the first connecting rod at one side of the hinge cup, the second fixing pin is used for fixing the hinged position of the first connecting rod at the other side of the hinge cup and the hinged position of the second connecting rod on the hinge cup. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural diagram of the present application Figure 1 .

[0017] Figure 2 is a structural diagram of the present application Figure 2 .

[0018] Figure 3 is a structural exploded view of the present application.

[0019] Figure 4 is a structural diagram of the damping and transmission structure Figure 1 .

[0020] Figure 5 is a structural diagram of the damping and transmission structure Figure 2 .

[0021] Figure 6 is a structural diagram of the damping Figure 1 .

[0022] Figure 7 is a structural diagram of the damping Figure 2 .

[0023] Figure 8 is a structural diagram of the hinge cup Figure 1 .

[0024] Figure 9 is a structural diagram of the hinge cup Figure 2 .

[0025] Figure 10 is a structural diagram of the hinge arm.

[0026] Figure 11 is a structural exploded view of the hinge arm.

[0027] Figure 12 is a structural schematic view of the upper cover.

[0028] Figure 13 is a structural schematic view of the decorative cover.

[0029] Figure 14 is a structural schematic view of the damping of Example Two.

[0030] Figure 15 is a structural schematic view of the damping of Example Three.

[0031] Figure 16 is a structural schematic view of the damping of Example Four.

[0032] Label Explanation: The hinge 1 with a simple cup inner damping structure, the hinge cup 2, the buffer groove 21, the third hinge joint 22, the fourth hinge joint 23, the first fixed pin 24, the first pin leg 241, the second pin leg 242, the second fixed pin 25, the third pin leg 251, the fourth pin leg 252, the hinge arm 3, the first hinge joint 31, the second hinge joint 32, the mounting seat 33, the assembly groove 331, the strip-shaped groove 332, the bottom plate 333, the extension 3331, the first adjusting groove 3332, the mounting cover 334, the second adjusting groove 3341, the upper cover 34, the knob 341, the clamping opening 342, the adjusting nail 343, the limiting column 344, the adjusting hole 345, the decorative cover 35, the clamping tongue 351, the damping 4, the sliding buckle 41, the fixed part 411, the reverse buckle 412, the deformation groove 413, the tooth groove 42, the base 43, the plug cylinder 44, the plug rod 45, the connecting rod structure 5, the tooth-shaped part 51, the gear tooth 511, the first connecting rod 52, the notch 521, the second connecting rod 53, the first bending part 531, the second bending part 532, the fin 533, the torsional spring 6. DETAILED DESCRIPTION

[0033] In the description of the present application, it should be understood that the "upper", "lower", "left", "right", "horizontal", "inner", "outer" and the like indicated orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] Example One See Figures 1 to 13The embodiment discloses a hinge with simple cup damping structure, which comprises a hinge cup 2, a hinge arm 3 and a damping 4, the hinge arm 3 is in transmission connection with the hinge cup 2 through a connecting rod structure 5, one end of the damping 4 abuts on the side wall of the hinge cup 2, a buffer groove 21 is formed on the hinge cup 2, a slide buckle 41 and a tooth groove 42 are arranged on the damping 4, the slide buckle 41 is slidably arranged in the buffer groove 21, a tooth-shaped part 51 is arranged on the connecting rod structure 5, the tooth-shaped part 51 is arranged on the upper side of the damping 4 and can rotate relative to the damping 4, when the hinge arm 3 moves to the side close to the hinge cup 2, the tooth-shaped part 51 rotates to engage with the tooth groove 42 and drives the damping 4 to compress.

[0035] A tooth 511 is arranged on the outer side wall of the tooth-shaped part 51 and matched with the tooth groove 42, when the tooth-shaped part 51 rotates to engage the tooth 511 with the tooth groove 42, the damping 4 moves to the side close to or away from the hinge arm 3 with the rotation of the tooth-shaped part 51, thereby compressing or recovering the damping 4. When the hinge 1 is in an open state, the tooth 511 is disengaged from the tooth groove 42, and the tooth groove 42 is located in the rotation track range of the tooth 511; when the hinge 1 is converted from the open state to the closed state, the connecting rod structure 5 drives the tooth-shaped part 51 to rotate, so that the tooth 511 is first engaged with the tooth groove 42, thereby pushing the damping 4 to move to the direction close to the hinge cup 2 through the tooth groove 42, realizing the compression of the damping 4, thereby buffering the movement of the hinge 1; when the hinge 1 is converted from the closed state to the open state, the tooth 511 drives the damping 4 to move away from the hinge cup 2 through the engagement with the tooth groove 42, so that the damping 4 is gradually reset until the tooth 511 is disengaged from the tooth groove 42.

[0036] The tooth-shaped part 51 is arranged in a circular arc shape, and the side wall of the tooth groove 42 is arranged in an inclined surface, so that the tooth 511 can more smoothly slide into or out of the tooth groove 42.

[0037] The slide buckle 41 comprises a fixed part 411 and a reverse buckle 412 formed by extending outward from both sides of the fixed part 411, the outer side of the reverse buckle 412 is arranged in an inclined surface, so that the width thereof gradually decreases from top to bottom, a deformation groove 413 is formed between the two reverse buckles 412, and the cross section of the slide buckle 41 is in the shape of "Ω".

[0038] The damping 4 further comprises a base 43, a plug cylinder 44 and a plug rod 45, the plug cylinder 44 is arranged on the upper side of the base 43, one end of the plug rod 45 is movably arranged in the plug cylinder 44, the other end abuts on the side wall of the hinge cup 2, the slide buckle 41 is arranged on the lower side of the base 43, and the upper wall surface of the base 43 is concave to form the tooth groove 42. The damping 4 realizes the length change of the plug rod 45 relative to the plug cylinder 44 through sliding, thereby completing the telescopic movement.

[0039] The connecting rod structure 5 comprises a first connecting rod 52 and a second connecting rod 53 arranged on the lower side of the first connecting rod 52, one end of the first connecting rod 52 is hinged with the hinge arm 3 through a first hinge point 31, the other end is hinged with the hinge cup 2 through a third hinge point 22, one end of the second connecting rod 53 is hinged with the hinge arm 3 through a second hinge point 32, the other end is hinged with the hinge cup 2 through a fourth hinge point 23, and the tooth-shaped part 51 is arranged on the first connecting rod 52. Through the hinge of the first connecting rod 52 and the second connecting rod 53 with the hinge arm 3 and the hinge cup 2 respectively, the movement of the hinge arm 3 is transmitted to the hinge cup 2 and the damper 4.

[0040] The distance between the first hinge point 31 and the upper wall surface of the hinge arm is less than the distance between the second hinge point 32 and the upper wall surface of the hinge arm 3, that is, the first hinge point 31 and the second hinge point 32 are not in the same horizontal plane, avoiding the conflict of the first connecting rod 52 and the second connecting rod 53 during movement.

[0041] The second connecting rod 53 comprises a first bending part 531 and a second bending part 532, the first bending part 531 is arranged on one side close to the second hinge point 32, and the second bending part 532 is arranged on one side close to the fourth hinge point 23.

[0042] A torsional spring 6 is further included, the torsional spring 6 is hinged with the first connecting rod 52 and the hinge arm 3 through the first hinge point 31, and the torsional arm of the torsional spring 6 abuts on the upper side of the second connecting rod 53. The torsional spring 6 continuously applies an elastic force to the second connecting rod 53, so that the second connecting rod 53 can keep stable position in static state, thereby ensuring that the hinge 1 can keep stable in the open or closed state.

[0043] The hinge arm 3 comprises a mounting seat 33 and an upper cover 34, the upper cover 34 covers the upper part of the mounting seat 33, an assembly groove 331 with one end opening is arranged on the upper wall surface of the mounting seat 33, a pushing block 341 is arranged in the upper cover 34, the pushing block 341 is slidably arranged in the assembly groove 331, and the first hinge point 31 and the second hinge point 32 are arranged on the upper cover 34. The mounting seat 33 is used for being mounted on a door plate, the upper cover 34 is in transmission connection with the connecting rod structure 5, and the connection between the mounting seat 33 and the upper cover 34 can transmit the movement of the door plate to the connecting rod structure 5, thereby closing or opening the hinge 1.

[0044] A strip-shaped groove 332 is arranged on the upper wall surface of the mounting seat 33, an adjusting nail 343 is arranged on the upper cover 34 and can slide in the strip-shaped groove 332, and the adjusting nail 343 is used for adjusting the relative position of the upper cover 34 and the mounting seat 33, so that the mounting is more accurate.

[0045] The mounting base 33 includes a base plate 333 and a mounting cover 334. The base plate 333 has upwardly extending portions 3331 on both sides. The mounting cover 334 is connected to the extending portions 3331 by screws. The base plate 333 has a first adjustment groove 3332, which is strip-shaped. During installation, the base plate 333 is first roughly positioned on the door panel using screws. The installation position of the base plate 333 is then fine-tuned using the first adjustment groove 3332. Finally, the mounting cover 334 is screwed onto the base plate 333, making installation simple and precise.

[0046] The mounting cover 334 has second adjustment grooves 3341 on both sides, and the upper cover 34 has adjustment holes 345 on both sides. The pin passes through the adjustment holes 345 and the second adjustment grooves 3341 to finely adjust the relative installation position of the upper cover 34 and the mounting cover 334.

[0047] The second connecting rod 53 extends a fin 533 on the side that is hinged to the hinge arm 3, and a limiting post 344 is connected between the two side walls of the upper cover 34, the limiting post 344 being disposed through the fin 533.

[0048] The upper cover 34 has a one-way open decorative cover 35 on its upper side. The upper wall of the upper cover 34 has a latch 342. The side wall of the decorative cover 35 extends inward with a downward latch 351, which engages with the latch 342. The mounting base 33, the upper cover 34, and the decorative cover 35 are assembled by stacking them layer by layer. This structure is easy to install, accurately positioned, and can effectively cover the internal components of the hinge arm 3, making the overall appearance neater and more beautiful.

[0049] The hinge cup 2 is provided with a U-shaped first fixing pin 24 and a second fixing pin 25. The first fixing pin 24 includes a first pin leg 241 that passes through the third hinge point 22 and is hinged to the first connecting rod 52, and a second pin leg 242 that passes through the side wall of the hinge cup 2. The second fixing pin 25 includes a third pin leg 251 that passes through the third hinge point 22 and is hinged to the first connecting rod 52, and a fourth pin leg 252 that is disposed on the fourth hinge point 23. The fourth pin leg 252 is hinged to one end of the second connecting rod 53. The first fixing pin 24 is used to define the hinge position of the first connecting rod 52 on one side of the hinge cup 2, and the second fixing pin 25 is used to fix the hinge position of the first connecting rod 52 on the other side of the hinge cup 2 and the hinge position of the second connecting rod 53 on the hinge cup 2.

[0050] The first connecting rod 52 is provided with a notch 521, and the fourth pin leg 252 is placed on the notch 521.

[0051] The first pin 241 and the second pin 242 are of equal or similar length and both pass through only one side wall of the hinge cup 2. The first pin 241 passes through the rotation axis of the third hinge point 22 and the toothed part 51. The third pin 251 passes through only one side wall of the hinge cup 2 and passes through the rotation axis of the third hinge point 22 and the toothed part 51. The fourth pin 252 passes through both side walls of the hinge cup 2. One end of the second connecting rod 53 is coiled around the fourth pin 252.

[0052] The base 43 is octagonal in shape, and the plug 44 is circular.

[0053] Compared with the prior art, the present invention provides a toothed part 51 on the hinge arm 3 and a toothed groove 42 on the damper 4 to cooperate with it, so that the hinge arm 3 and the damper 4 directly form a gear and rack transmission structure. This not only makes the transmission smooth and uniform and responds quickly, but also greatly simplifies the overall structure and reduces the dependence on intermediate connecting parts, thereby improving the transmission efficiency and reliability, while reducing manufacturing costs and assembly complexity.

[0054] Example 2 See Figure 14 This embodiment is an improvement on the first embodiment, and the difference between it and the first embodiment is that the shape of the damper 4 is different.

[0055] The stopper 44 is rocket-shaped, and the base 43 is hexagonal.

[0056] Compared with Example 1, the damper 4 in this example has a more unique design, which meets consumers' demand for personalized products.

[0057] Example 3 See Figure 15 This embodiment is an improvement on the first embodiment, and the difference between it and the first embodiment is that the shape of the damper 4 is different.

[0058] The base 43 is shaped like a flying fish, and the plug 44 is circular.

[0059] Compared with Example 1, the damper 4 in this example has a more unique design, which meets consumers' demand for personalized products.

[0060] Example 4 See Figure 16 This embodiment is an improvement on the first embodiment, and the difference between it and the first embodiment is that the shape of the damper 4 is different.

[0061] The base 43 is shaped like a flying fish, and the plug 44 is shaped like a rocket.

[0062] Compared with Example 1, the damper 4 in this example has a more unique design, which meets consumers' demand for personalized products.

[0063] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A hinge with a simple cup-like internal damping structure, characterized in that, The device includes a hinge cup (2), a hinge arm (3), and a damper (4). The hinge arm (3) is connected to the hinge cup (2) via a connecting rod structure (5). One end of the damper (4) abuts against the side wall of the hinge cup (2). The hinge cup (2) has a buffer groove (21). The damper (4) has a sliding buckle (41) and a toothed groove (42). The sliding buckle (41) is slidably disposed in the buffer groove (21). The connecting rod structure (5) has a toothed part (51). The toothed part (51) is disposed on the upper side of the damper (4) and can rotate relative to the damper (4). When the hinge arm (3) moves toward the side closer to the hinge cup (2), the toothed part (51) rotates to mesh with the toothed groove (42) and drives the damper (4) to compress.

2. The hinge according to claim 1, characterized in that, The outer wall of the toothed part (51) has protruding teeth (511) that are adapted to the tooth groove (42). When the toothed part (51) rotates to the point where the teeth (511) mesh with the tooth groove (42), the damping (4) moves toward or away from the hinge arm (3) as the toothed part (51) rotates, thereby compressing or restoring the damping (4).

3. The hinge according to claim 1, characterized in that, The sliding buckle (41) includes a fixing part (411) and an undercut (412) extending outward from both sides of the fixing part (411). The outer side of the undercut (412) is set as an inclined surface so that its width gradually decreases from top to bottom. A deformation groove (413) is formed between the two undercuts (412).

4. The hinge according to claim 2, characterized in that, The damping (4) also includes a base (43), a plug cylinder (44) and a plug rod (45). The plug cylinder (44) is located on the upper side of the base (43). One end of the plug rod (45) is movably located inside the plug cylinder (44), and the other end abuts against the side wall of the hinge cup (2). The sliding buckle (41) is located on the lower side of the base (43), and the upper wall surface of the base (43) is recessed to form the tooth groove (42).

5. The hinge according to claim 1, characterized in that, The connecting rod structure (5) includes a first connecting rod (52) and a second connecting rod (53) disposed on the lower side of the first connecting rod (52). One end of the first connecting rod (52) is hinged to the hinge arm (3) through a first hinge point (31), and the other end is hinged to the hinge cup (2) through a third hinge point (22). One end of the second connecting rod (53) is hinged to the hinge arm (3) through a second hinge point (32), and the other end is hinged to the hinge cup (2) through a fourth hinge point (23). The toothed part (51) is disposed on the first connecting rod (52).

6. The hinge according to claim 5, characterized in that, It also includes a torsion spring (6), which is hinged to the first link (52) and the hinge arm (3) through the first hinge point (31), and the torsion arm of the torsion spring (6) abuts against the upper side of the second link (53).

7. The hinge according to claim 5, characterized in that, The hinge arm (3) includes a mounting base (33) and a top cover (34). The top cover (34) covers the upper part of the mounting base (33). The mounting base (33) has an assembly groove (331) with one end open on its upper wall. The top cover (34) is provided with a lever (341). The lever (341) is slidably placed in the assembly groove (331). The first hinge point (31) and the second hinge point (32) are both located on the top cover (34).

8. The hinge according to claim 7, characterized in that, Limiting posts (344) are connected between the two side walls of the upper cover (34), and the limiting posts (344) are located on the side where the second connecting rod (53) is hinged to the hinge arm (3).

9. The hinge according to claim 7, characterized in that, The upper cover (34) has a decorative cover (35) with a one-way opening on the upper side. The upper wall of the upper cover (34) has a slot (342). The side wall of the decorative cover (35) extends inward with a downward latch (351). The latch (351) is engaged with the slot (342).

10. The hinge according to claim 5, characterized in that, The hinge cup (2) is provided with a "U"-shaped first fixing pin (24) and a second fixing pin (25). The first fixing pin (24) includes a first pin leg (241) that passes through the third hinge point (22) and is hinged to the first connecting rod (52) and a second pin leg (242) that passes through the side wall of the hinge cup (2). The second fixing pin (25) includes a third pin leg (251) that passes through the third hinge point (22) and is hinged to the first connecting rod (52) and a fourth pin leg (252) that is provided on the fourth hinge point (23). The fourth pin leg (252) is hinged to one end of the second connecting rod (53).

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