Hinge

Abstract

The invention relates to the technical field of hardware fittings, in particular to a hinge which comprises an arm body, a cup head, a torsion spring, an inner rocker arm, an outer rocker arm and two ends of the outer rocker arm, the two ends of the inner rocker arm are hinged to the cup head and the arm body respectively, the hinge further comprises a spring shaft, and the spring shaft is installed on the inner side of the arm body in the width direction of the arm body and located on the rear side of the tail end of the inner rocker arm and the rear side of the tail end of the outer rocker arm. The hinge has the advantages that the torsion spring is independently arranged outside the inner rocker arm and the outer rocker arm to provide power for closing of the hinge, the inner rocker arm and the outer rocker arm are not reserved for mounting space of the torsion spring, the distance between the inner rocker arm and the outer rocker arm can be set to be closer, the structure of the cup head is more compact, and the cup head is more attractive in appearance. The overall height of the cup head is reduced, the structure in the arm body is more compact, the overall height of the arm body is reduced, namely, the overall height of the hinge is reduced, the material cost is saved, and installation of a hinge user is facilitated.

Description

Technical Field

[0001] This invention relates to the technical field of hardware accessories, and in particular to a hinge. Background Technology

[0002] Hinges, as a basic mechanical component, are widely used to connect fixed parts and moving parts, enabling relative rotation between the two parts. In the furniture industry, hinges are used in cabinet doors, window sashes, room doors, and other furniture, allowing these components to open and close freely.

[0003] Patent application number 202521412995.2 discloses an easily adjustable single-straight hinge, including a hinge cup, an outer rocker arm, an inner rocker arm, a base assembly, and a torsion spring. The base assembly is an arm assembly, and the torsion spring is sleeved on the outside of the hinge axis between the outer rocker arm and the base assembly. The two lever arms of the torsion spring respectively abut against the base assembly and the inner rocker arm. The aforementioned solution uses a torsion spring as a spring element. The torsion spring is relatively large, requiring a large space to be reserved between the outer rocker arm and the inner rocker arm for its installation. This results in a relatively thick overall height for both the hinge cup and the base assembly. Patent document CN107109882B discloses a type of hinge for furniture... The deceleration hinge includes a fixed part, a movable part, and a leaf spring. The fixed part is the arm body, and the movable part is the cup head. When the fixed part and the movable part are closed, the leaf spring acts as a spring force. The two spring arms of the leaf spring abut against the inner surface of the fixed part and the cam, respectively. The cam then transmits the spring force to the rocker arm, which is the inner rocker arm and the outer rocker arm. The aforementioned solution uses a leaf spring as the spring force component. Compared with the traditional torsion spring, it has the advantage of smaller size. The fixed part and the movable part can be equipped with a small space to accommodate the leaf spring, thereby reducing the overall height of the fixed part and the movable part. However, the leaf spring is more expensive than the torsion spring, which brings the disadvantage of increased cost. Furthermore, after the hinge is installed on the furniture, its length needs to be adjusted according to the installation angle and length of the fixed part and the moving part. In the patent application with application number 202521412995.2, a one-piece hinge that is easy to adjust is disclosed, including a base assembly fixed to the wall and a hinge body detachable from the base assembly. The hinge body includes an arm body, and the base assembly is set inside the arm body. The base assembly includes an outer base frame and an inner base frame connected vertically. The arm body is movably connected to the outer base frame through a first fastening adjustment member and a first positioning adjustment member. After the inner base frame is fixed to the wall, the first positioning adjustment member adjusts the relative position of the hinge body and the base assembly in the length direction by driving the eccentric rotating shaft, that is, adjusting the extension length of the hinge, and then tightening the first fastening adjustment member to fix it.

[0004] However, the first positioning adjustment component is located after the first and second fastening adjustment components, that is, at the tail of the arm body. The front of the arm body is prone to friction with the outer frame of the base, which makes the adjustment of the first positioning adjustment component difficult. Furthermore, when adjusting the second fastening adjustment component to adjust the distance between the inner top surface of the arm body and the outer frame of the base, the first fastening adjustment component is used as the fulcrum, which means that the inner top surface of the arm body and the outer frame of the base can only rotate around the first fastening adjustment component. The adjustment range is small and the resistance is large. Moreover, when rotating the first positioning adjustment component in the aforementioned way, the extension length of the hinge can only be judged by observing the extension length of the arm body and the base. When rotating, the screwdriver and the first positioning adjustment component together block the user from observing the scale, so the user does not know the critical point of the extension length. If the rotation is excessive, it must be readjusted, which increases the difficulty of adjusting the extension amount of the hinge. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing torsion spring is usually installed between the inner rocker arm and the outer rocker arm, which leads to an increase in the thickness of the arm body and the cup head. Using a leaf spring can reduce the thickness, but it will increase the material cost of the parts.

[0006] To achieve the above objectives, the present invention discloses a hinge, including an arm body, a cup head, a torsion spring, an inner rocker arm, and an outer rocker arm. The two ends of the outer rocker arm and the two ends of the inner rocker arm are respectively hinged to the cup head and the arm body. The hinge also includes a spring shaft, which is installed on the inner side of the arm body along the width direction of the arm body, and the spring shaft is located behind the ends of the inner rocker arm and the outer rocker arm. The torsion spring is sleeved on the spring shaft, and the two lever arms of the torsion spring abut against the arm body and the inner rocker arm respectively.

[0007] It also includes a first outer shaft and a first inner shaft. The outer rocker arm is hinged to the front of the arm body through the first outer shaft. The inner rocker arm is hinged to the bottom of the arm body through the first inner shaft and is located behind the first outer shaft. The spring shaft is located above and behind the first inner shaft.

[0008] It also includes an arc member, which is a curved sheet-like body. The inner arc surface of the arc member is mounted on the inner rocker arm, and the outer arc surface of the arc member protrudes in the direction of the torsion spring arm and abuts against the torsion spring.

[0009] It also includes a connecting member, which is connected to the inner rocker arm, and the inner arc surface of the arc member is connected to the connecting member.

[0010] The middle connector has a receiving groove, and the two sides of the receiving groove have respectively a locking hole. The locking holes are arranged in two sets, and the two locking holes have the same cross-section as the arc component. The receiving groove has a curved surface that fits with the inner arc surface of the arc component. The wall of the locking hole that fits with the inner arc surface is coplanar with the curved surface.

[0011] The device also includes a connecting member, which is connected to the inner rocker arm. The inner rocker arm has a connecting wing at one end near the arm body. The connecting wing is provided in two sets. The connecting member is connected between the two connecting wing portions. The outer surfaces of the two connecting wing portions and the outer surface of the connecting member are coplanar.

[0012] The device includes a base, an eccentric wheel, a locking component, and an adjusting component for adjusting the gap between the arm and the base. The top surface of the arm has an elongated groove, and the bottom surface of the groove has a first locking hole extending along the length of the arm. The base has a second locking hole, a U-shaped notch groove, and an elongated hole extending along the width of the arm. The arm has an adjustment hole and an adjusting hole. The locking component passes through the first locking hole and is threadedly connected to the second locking hole. The main body of the eccentric wheel is located between the arm and the base, and its top adjusting cap is located in the adjustment hole. The eccentric portion of the eccentric wheel is located within the elongated hole. The adjusting component is threadedly connected to the adjusting hole. The bottom of the outer wall of the adjusting component has an annular groove. The base is placed in the annular groove through the U-shaped notch groove. When the eccentric wheel rotates, the eccentric portion causes the base to move relative to the arm for adjustment.

[0013] The base is provided with an elastic tongue, the elongated hole is opened in the elastic tongue, and the wheel body of the eccentric wheel is clamped to the lower surface of the arm body through the elastic tongue.

[0014] The first locking hole, the adjustment hole, and the distance adjustment hole are arranged sequentially from the direction away from the cup head to the direction of the cup head. When the distance adjustment component is rotated, the locking component serves as a fulcrum, and the arm body and the base rotate around the locking component.

[0015] The outer top surface of the base is provided with a tooth-like body, the extension direction of the tooth-like body is perpendicular to the sliding direction of the base, and the tooth-like body abuts against the inner top surface of the arm body to increase the friction between the arm body and the base in the locked state.

[0016] The base has a protrusion on its outer top surface, the toothed body is disposed on the top surface of the protrusion, and the second locking hole passes through the toothed body.

[0017] The locking element is a screw, and the distance difference between the outer edge of the bottom surface of the long groove and the edge of the opening of the first locking hole is equal to the radius difference between the screw head of the eccentric wheel and the screw rod.

[0018] It also includes a cylindrical component and a cylindrical shaft, the cylindrical shaft being connected to the inner rocker arm, the cylindrical component being sleeved on the outside of the cylindrical shaft, and the outer ring surface of the cylindrical component abutting against the lever arm of the torsion spring.

[0019] Compared to existing technologies, the advantages of this invention are as follows: Compared to the torsion spring mounting scheme in patent application number 202521412995.2, the torsion spring of this invention is not sleeved on the first outer shaft, but rather separately sleeved on the spring shaft. Compared to the scheme in patent document publication number CN107109882B, the elastic element used in this invention is not a leaf spring, but a torsion spring. This eliminates the need for the torsion spring to be clamped between the inner and outer rocker arms, and eliminates the need to reserve installation space for the torsion spring between the inner and outer rocker arms. The distance between the arms can be set closer, making the second outer shaft and the second inner shaft more compact at the cup head, thereby reducing the distance from the bottom to the top of the cup head, i.e., reducing the overall height of the cup head; at the same time, it also allows the first outer shaft and the first inner shaft to be set closer to each other, and the mounting holes of the first outer shaft and the first inner shaft on the arm body can also be set closer, thereby making the internal structure of the arm body more compact, reducing the overall height of the arm body, i.e., reducing the overall height of the hinge, thus saving material costs. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of an embodiment 1 of a hinge; Figure 2 A perspective view of embodiment 1 of a hinge; Figure 3 A schematic diagram showing the disassembly of some parts of an embodiment 1 of a hinge; Figure 4 This is a schematic diagram of the arm and base of an embodiment 1 of a hinge; Figure 5 This is a schematic diagram showing a cross-sectional view of some parts of an embodiment 1 of a hinge. Figure 6 A schematic diagram of the torsion spring and inner rocker arm in embodiment 1 of a hinge; Figure 7 This is a schematic diagram of the arc member, the connecting member, and the locking member of an embodiment 1 of a hinge; Figure 8 This is a schematic diagram of the eccentric wheel and adjusting element in Embodiment 1 of a hinge; Figure 9 This is a structural schematic diagram showing the cross-sectional view of some parts of a second embodiment of a hinge. Figure 10 A side view of a portion of a component in embodiment 2 of a hinge.

[0021] Markings: 11. Cup head; 12. Arm body; 13. Base; 14. Eccentric wheel; 15. Locking element; 151. Screw head; 152. Screw; 16. Long slot; 17. First locking hole; 18. Second locking hole; 19. Toothed body; 20. Protrusion; 21. Outer rocker arm; 22. Inner rocker arm; 23. Arc element; 231. Outer arc surface; 232. Inner arc surface; 24. Connector; 25. Receiving groove; 26. Curved surface; 27. Mounting hole; 28. Torsion spring; 28 1. Torsion spring; 29. ​​U-shaped part; 30. Connecting wing part; 31. Adjusting piece; 311. Annular groove; 32. Adjusting hole; 33. U-shaped notch groove; 34. Receiving cover; 121. Adjusting hole; 35. Elastic tongue; 36. Elongated hole; 141. Wheel body; 142. Eccentric part; 282. Spring shaft; 211. First outer shaft; 222. First inner shaft; 122. Connecting lug; 213. Second outer shaft; 223. Second inner shaft; 37. Cylindrical part; 38. Cylindrical shaft. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the following will be combined with... Figure 1-7 The state shown is described in terms of orientation and structure.

[0023] The following will combine Figure 1-10 The invention will be further described in detail with reference to the accompanying drawings.

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, reference is made to... Figure 1-10 As shown, the present invention will now be described.

[0025] Example 1: Since hinges require adjustment of their length after installation on furniture based on the installation angle and length of the fixed and moving parts, patent application number 202521412995.2 discloses an easily adjustable single-piece hinge. This hinge includes a base assembly fixed to a wall and a hinge body detachably mounted on the base assembly. The hinge body includes an arm, and the base assembly is housed within the arm. The base assembly includes an outer base frame and an inner base frame connected vertically. The arm is movably connected to the outer base frame via a first fastening adjustment member and a first positioning adjustment member. After the inner base frame is fixed to the wall, the first positioning adjustment member adjusts the relative position of the hinge body and the base assembly in the length direction by driving an eccentric rotating shaft, thus adjusting the hinge's extension length. The first fastening adjustment member is then tightened to secure the hinge. This is achieved through the aforementioned method. When rotating the first positioning adjustment component, the hinge's extension length can only be judged by observing the extension and retraction of the arm and base. Furthermore, the screwdriver, in conjunction with the first positioning adjustment component, obstructs the user's view of the scale, making it difficult to determine the critical point of extension and retraction. Excessive rotation necessitates readjustment, increasing the difficulty of adjusting the hinge's extension and retraction. Additionally, the first positioning adjustment component is located after the first and second fastening adjustment components, i.e., at the tail of the arm. The front of the arm is prone to friction with the outer frame of the base, leading to difficulty in adjusting the first positioning adjustment component. Moreover, when adjusting the second fastening adjustment component to adjust the distance between the inner top surface of the arm and the outer frame of the base, the first fastening adjustment component is used as a fulcrum, causing the inner top surface of the arm and the outer frame of the base to only rotate around the first fastening adjustment component, resulting in a small adjustment range and high resistance. To solve these problems, refer to... Figure 1-8As shown, the present invention provides a hinge, including an arm 12, a base 13, an eccentric wheel 14, a locking element 15, a cup head 11, and a receiving cover 34. The receiving cover 34 is installed on the cup head 11 to accommodate and fix a buffer assembly installed on the cup head 11. One of the arm 12 and the cup head 11 is connected to the fixed part of the furniture, and the other is connected to the movable part of the furniture. The arm 12 and the cup head 11 rotate relative to each other to allow the movable part of the furniture to rotate relative to the fixed part. The top surface of the arm 12 has an elongated groove 16, and the bottom surface of the elongated groove 16 has a first locking hole 17, which is elliptical or rectangular. The base 13 has a second locking hole 18. The eccentric wheel 14 is connected between the arm 12 and the base 13 and is used for driving. The boom body 12 and the base 13 move relative to each other. The specific driving method has been disclosed in the patent application with application number 202521412995.2, and will not be described in detail here. The locking member 15 passes through the first locking hole 17 and is threadedly connected to the second locking hole 18. The boom body 12 has an adjustment hole 121, and the base 13 has an elastic tongue 35. The elastic tongue 35 has an elongated hole 36 extending along the width direction of the boom body 12. The eccentric wheel 14 includes a wheel body 141 and an eccentric part 142. The wheel body 141 of the eccentric wheel 14 is located between the boom body 12 and the base 13, and the top adjustment cap is located in the adjustment hole 121. Specifically, the wheel body 141 of the eccentric wheel 14 is clamped to the lower surface of the boom body 12 by the elastic tongue 35. The eccentric part 142 is slidably connected to the elongated hole 36, so that when the eccentric wheel 14 is rotated, the eccentric part 142 slides in the elongated hole 36, thereby driving the base 13 to move relative to the arm body 12. The base 13 has a U-shaped notch groove 33, and the arm body 12 has an adjustment hole 32. The adjustment part 31 is threadedly connected to the adjustment hole 32. The bottom of the outer wall of the adjustment part 31 has an annular groove 311. The base 13 is connected to the annular groove 311 through the U-shaped notch groove 33. The locking part 15 is threadedly connected to the second locking hole 18. The first locking hole 17, the adjustment hole 121, and the adjustment hole 32 are arranged sequentially on the arm body 12 from the side away from the cup head 11 to the side closer to the cup head 11. The eccentric wheel 14 is rotated through the adjustment hole 121 to adjust the distance. Hole 121 is located between locking member 15 and adjusting member 31. Eccentric wheel 14 is the first positioning adjustment member in the patent application with application number 202521412995.2 mentioned in the background art. In contrast, the eccentric wheel 14 of the present invention is set at a position close to the middle of the arm body 12, and the eccentric part 142 slides at a position close to the middle of the base 13. Through the above setting, the smoothness of driving the base 13 is improved. When the adjusting member 31 is rotated to adjust the gap between the inner top surface of the arm body 12 and the outer top surface of the base 13, if the gap between the arm body 12 and the base 13 becomes smaller, the wheel body 141 of the eccentric wheel 14 will press against the elastic tongue 35, and the elastic tongue 35 will elastically deform to play the role of cooperating with the position change of the wheel body 141. When the adjusting member 31 is rotated to adjust the gap between the inner top surface of the arm body 12 and the outer top surface of the base 13, the locking member 15 acts as a fulcrum, that is, the arm body 12 or the base 13 rotates slightly around the locking member 15. Compared with the patent application with application number 202521412995.2 mentioned in the background art, the fulcrum is located at the position of the second adjustment hole, which is close to the middle of the arm body. In this invention, the locking member 15 and the first locking hole 17 are set near the tail of the arm body 12. The distance between the adjusting member 31 and the locking member 15 is larger, and the resistance to adjustment is smaller, thereby making the adjustable range of the distance between the arm body 12 and the base 13 larger.

[0026] Rotate the eccentric wheel 14 to adjust the relative position of the arm body 12 and the base 13. The base 13 drives the locking member 15 to move in the first locking hole 17 through the second locking hole 18, that is, the locking member 15 moves in the long groove 16. By observing the position of the locking member 15 in the long groove 16, the user can determine the critical point of the relative movement distance between the arm body 12 and the base 13, thereby determining the extension length of the hinge, that is, the critical point of the relative extension length between the arm body 12 and the base 13. This reduces the possibility that the screwdriver and the eccentric wheel 14 will obstruct the user's position of the locking member 15 in the long groove 16 when rotating, making the relative extension length between the arm body 12 and the base 13 visible. Stop rotating the eccentric wheel 14 and tighten the locking member 15 so that the inner top surface of the arm body 12 abuts against the outer bottom surface of the base 13, increasing the friction to lock the arm body 12 and the base 13.

[0027] The second locking hole 18 is a circular screw hole, and the eccentric wheel 14 is a screw.

[0028] When the arm body 12 and the base 13 are subjected to mutual abutment force by the locking member 15, the friction between the arm body 12 and the base 13 locks their relative positions. However, since both the arm body 12 and the base 13 are made of polished metal, the friction between the arm body 12 and the base 13 is relatively small, which makes it more likely that the arm body 12 and the base 13 will move relative to each other when subjected to force. To solve the above problem, the outer top surface of the base 13 is provided with a toothed body 19. The extension direction of the toothed body 19 is perpendicular to the sliding direction of the base 13. When the arm body 12 and the base 13 are locked relative to each other, the toothed body 19 abuts against the inner top surface of the arm body 12. The toothed body 19 increases the friction between the arm body 12 and the base 13, thereby improving the locking stability between the arm body 12 and the base 13.

[0029] A further embodiment is that the outer top surface of the base 13 is provided with a protrusion 20, and a toothed body 19 is provided on the top surface of the protrusion 20. The second locking hole 18 passes through the toothed body 19 and the protrusion 20. With the above arrangement, when the arm body 12 is locked with the base 13, the pressure of the locking member 15 on the arm body 12 and the base 13 acts on the toothed body 19 around the second locking hole 18, further improving the friction of the arm body 12 and the base 13 in the locked state.

[0030] A further embodiment is that the bottom surface of the long groove 16 is elliptical, the opening of the first locking hole 17 is elliptical, and the outer edge of the bottom surface of the long groove 16 and the edge of the opening of the first locking hole 17 are equidistant.

[0031] The locking element 15 is a screw. The distance difference between the outer edge of the bottom surface of the long groove 16 and the edge of the opening of the first locking hole 17 is equal to the radius difference between the screw head 151 and the screw rod 152 of the eccentric wheel 14. When the eccentric wheel 14 adjusts the arm body 12 and the base 13 to its longest extension, the locking element 15 is closest to the arc-shaped sidewall of the long groove 16 away from the eccentric wheel 14. When the eccentric wheel 14 adjusts the arm body 12 and the base 13 to its shortest extension, the locking element 15 is closest to the arc-shaped sidewall of the long groove 16 near the eccentric wheel 14, thereby further making the relative extension length of the arm body 12 and the base 13 visible.

[0032] In patent application number 202521412995.2, the two lever arms of the torsion spring abut against the base assembly and the inner rocker arm respectively, resulting in a large angle between the two lever arms. This causes the torsion spring to loosen easily, has a short fatigue life, and consequently shortens its service life. Furthermore, the existing torsion spring is usually installed between the inner and outer rocker arms, leading to an increase in the thickness of the arm body and the cup head. While using a leaf spring can reduce the thickness, it increases the material cost of the parts. To solve the above problems, this invention... Figure 1In this invention, direction a represents the forward direction and direction b represents the backward direction, defining the front and rear parts of the arm body 12, and the front end and rear end of the arm body 12. The invention also includes an outer rocker arm 21, an arc member 23, a torsion spring 28, a spring shaft 282, a first outer shaft 211, a first inner shaft 222, a second outer shaft 213, a second inner shaft 223, and an inner rocker arm 22 for abutting against the torsion spring 28. The spring shaft 282 is installed on the inner side of the arm body 12 and extends towards the width direction of the arm body 12. The torsion spring 28 is sleeved on the spring shaft 282. The two ends of the outer rocker arm 21 are hinged to the cup head 11 and the arm body 12, respectively. The outer rocker arm 21 is hinged to the connecting ear 122 at the front end of the arm body 12 via the first outer shaft 211, and to the cup head 11 via the second outer shaft 213. The inner rocker arm 22 is hinged to the bottom of the arm body 12 via the first inner shaft 222 and is located at the connecting ear 122. On the rear side, the inner rocker arm 22 is hinged to the cup head 11 via the second inner shaft 223. The spring shaft 282 is located above and behind the first inner shaft 222. The two ends of the inner rocker arm 22 are respectively hinged to the cup head 11 and the arm body 12. The arc member 23 is a curved sheet-like body. The inner arc surface 232 of the arc member 23 is installed on the inner rocker arm 22. The outer arc surface 231 of the arc member 23 protrudes towards the direction of the torsion spring 28 lever arm. The outer arc surface 231 of the arc member 23 abuts against the torsion spring 28. Through the above configuration, the arc member 23 makes the angle between the two lever arms of the torsion spring 28 smaller, which can increase the service life of the torsion spring 28. The arc member 23 and the inner rocker arm 22 are detachable. When assembling the hinge, the arc member 23 and the inner rocker arm 22 are installed. When selecting materials, the arc member 23 uses a material with high wear resistance, while the inner rocker arm 22 uses a material with high hardness.

[0033] To address the issues of thickness and compactness of the cup head and arm mentioned in the background art, the above solution uses a torsion spring 28, with its lever arm abutting against the inner surface of the arm 12 and the outer arc surface 231 of the arc member 23. The arc member 23 then acts on the inner rocker arm 22. This ensures that the elastic force of the torsion spring 28 acts between the inner rocker arm 22 and the arm 12. Compared to the torsion spring installation scheme in patent application number 202521412995.2, the torsion spring 28 of this invention is not sleeved on the first outer shaft 211, but rather separately sleeved on the spring shaft 282. This eliminates the need for the torsion spring 28 to be clamped between the inner rocker arm 22 and the outer rocker arm 21, and eliminates the need for a pre-reserved space between the inner rocker arm 22 and the outer rocker arm 21. With an installation space of 8, the distance between the inner rocker arm 22 and the outer rocker arm 21 can be set closer, making the second outer shaft 213 and the second inner shaft 223 more compact at the position of the cup head 11, thereby reducing the distance from the bottom to the top of the cup head 11, i.e., reducing the overall height of the cup head 11; at the same time, it also allows the first outer shaft 211 and the first inner shaft 222 to be set closer to each other, and on the arm body 12, the mounting holes of the first outer shaft 211 and the first inner shaft 222 can also be set closer, thereby making the structure inside the arm body 12 more compact, reducing the overall height of the arm body 12, i.e., reducing the overall height of the hinge, thereby saving material costs and facilitating the installation of the hinge into the furniture.

[0034] Since the spring shaft 282 and torsion spring 28 are independently set outside the inner rocker arm 22 and the outer rocker arm 21, and for the sake of hinge compactness, a torsion spring 28 with a short lever arm is usually required. However, if the angle between the lever arms of the torsion spring 28 is large, the torsion spring 28 will easily loosen, have a short fatigue life, and thus shorten its service life. The above problem is solved by setting the arc member 23. The outer arc surface of the arc member 23 lifts the lever arm of the torsion spring 28, thereby reducing the angle between the two lever arms of the torsion spring 28, improving the fatigue life of the torsion spring 28, and thus improving its service life.

[0035] The present invention also includes a connecting member 24, which is used to connect the arc member 23 and the inner rocker arm 22. The connecting member 24 is connected to the inner rocker arm 22, and the inner arc surface 232 of the arc member 23 is connected to the connecting member 24.

[0036] Specifically, the connecting member 24 has a receiving groove 25, and two sets of locking holes 27 are provided on both sides of the receiving groove 25. The two locking holes 27 have the same cross-section as the arc member 23. The receiving groove 25 has a curved surface 26 that fits against the inner arc surface 232 of the arc member 23. The curved surface 26 and the hole wall of the locking hole 27 are coplanar. When assembling the hinge, the arc member 23 is first installed on the connecting member 24, and the inner arc surface 232 of the arc member 23 fits against the curved surface 26. The two ends are respectively placed in two mounting holes 27 to realize the installation of the arc member 23 and the middle connector 24. Then, the arc member 23 and the middle connector 24 that have been installed together are installed into the inner rocker arm 22. With the above settings, the middle connector 24 does not need to abut against the torsion spring 28, nor does it need to be hinged to other parts, so that the material of the middle connector 24 can be set to plastic, saving costs. At the same time, the arc member 23 is installed into the middle connector 24 first, and then installed into the inner rocker arm 22, which improves the convenience of installing the arc member 23.

[0037] A further embodiment is that the inner rocker arm 22 is provided with a connecting wing 30 at one end near the torsion spring 28. The connecting wing 30 is provided in two sets, and the middle connector 24 is connected between the two connecting wing 30. The sides of the two connecting wing 30 facing the torsion spring 28 are flush with the sides of the middle connector 24 facing the torsion spring 28. The top surfaces of the two connecting wing 30 and the top surface of the middle connector 24 are coplanar. That is, the outer surfaces of the two connecting wing 30 and the outer surfaces of the middle connector 24 are coplanar.

[0038] A further embodiment is that the torsion spring 28 is a double torsion spring 28, which includes two sub-torsion springs 281. The torsion walls of the two sub-torsion springs 281 are connected and form a U-shaped part 29, which abuts against the arc member 23.

[0039] The present invention also includes an adjusting member 31, which is a screw. The arm body 12 has an adjusting hole 32, and the base 13 has a U-shaped notch groove 33. The adjusting member 31 passes through the adjusting hole 32 and the U-shaped notch groove 33. The first locking hole 17, the eccentric wheel 14, and the adjusting hole 32 are arranged in sequence on the arm body 12.

[0040] Example 2: Refer to Figure 9 , 10 As shown, the difference between this embodiment and Embodiment 1 is that the intermediate connector 24 and the arc member 23 are replaced by the cylindrical member 37 and the cylindrical shaft 38. The cylindrical shaft 38 is connected to the inner rocker arm 22, and the cylindrical member 37 is sleeved on the outside of the cylindrical shaft 38. The outer ring surface of the cylindrical member 37 abuts against the U-shaped part 29 of the torsion spring 28. Thus, the cylindrical member 37 and the cylindrical shaft 38 replace the function of the intermediate connector 24 and the arc member 23. The cylindrical member 37 lifts the lever arm of the torsion spring 28, that is, 37 lifts the U-shaped part 29 of the torsion spring 28, thereby reducing the lever arm angle of the torsion spring 28. At the same time, the cylindrical member 37 replaces the function of the intermediate connector 24 and the arc member 23, optimizing the number of parts and saving costs.

[0041] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They cannot be used to limit the scope of protection of the present invention. All modifications made according to the spirit of the main technical solution of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hinge comprising an arm body (12), a cup head (11), a torsion spring (28), an inner rocker arm (22), and an outer rocker arm (21), wherein the two ends of the outer rocker arm (21) and the two ends of the inner rocker arm (22) are respectively hinged to the cup head (11) and the arm body (12), characterized in that, It also includes a spring shaft (282), which is installed on the inner side of the arm body (12) along the width direction of the arm body (12), and the spring shaft (282) is located on the rear side of the end of the inner rocker arm (22) and the end of the outer rocker arm (21). The torsion spring (28) is sleeved on the spring shaft (282), and the two lever arms of the torsion spring (28) abut against the arm body (12) and the inner rocker arm (22) respectively.

2. A hinge according to claim 1, characterized in that, It also includes a first outer shaft (211) and a first inner shaft (222). The outer rocker arm (21) is hinged to the front of the arm body (12) through the first outer shaft (211). The inner rocker arm (22) is hinged to the bottom of the arm body (12) through the first inner shaft (222) and is located behind the first outer shaft (211). The spring shaft (282) is located above and behind the first inner shaft (222).

3. A hinge according to claim 2, characterized in that, It also includes an arc member (23), which is a curved sheet. The inner arc surface (232) of the arc member (23) is mounted on the inner rocker arm (22). The outer arc surface (231) of the arc member (23) protrudes toward the lever arm of the torsion spring (28) and abuts against the torsion spring (28).

4. A hinge according to claim 3, characterized in that, It also includes a middle connector (24), which is connected to the inner rocker arm (22), and the inner arc surface (232) of the arc member (23) is connected to the middle connector (24).

5. A hinge according to claim 4, characterized in that, The middle connector (24) has a receiving groove (25), and the two sides of the receiving groove (25) are respectively provided with mounting holes (27). The mounting holes (27) are provided in two sets, and the two mounting holes (27) are the same as the cross section of the arc member (23). The receiving groove (25) has a curved surface (26) that fits with the inner arc surface (232) of the arc member (23). The hole wall that fits with the mounting hole (27) and the inner arc surface (232) is coplanar with the curved surface (26).

6. A hinge according to claim 1, characterized in that, It also includes a middle connector (24), which is connected to the inner rocker arm (22). The inner rocker arm (22) has a connecting wing (30) at one end near the arm body (12). The connecting wing (30) is provided in two sets. The middle connector (24) is connected between the two connecting wing (30). The outer side of the two connecting wing (30) is coplanar with the outer side of the middle connector (24).

7. A hinge according to claim 1, characterized in that, The arm (12) includes a base (13), an eccentric wheel (14), a locking member (15), and an adjusting member (31) for adjusting the gap between the arm (12) and the base (13). The top surface of the arm (12) has a long groove (16), and the bottom surface of the long groove (16) has a first locking hole (17) extending along the length of the arm (12). The base (13) has a second locking hole (18), a U-shaped notch groove (33), and an elongated hole (36) extending along the width of the arm (12). The arm (12) has an adjusting hole (121) and an adjusting hole (32). The locking member (15) passes through the first locking hole (17) and is connected to the second locking hole (18). 18) Threaded connection, the wheel body (141) of the eccentric wheel (14) is located between the arm body (12) and the base (13), and the top adjustment cap is located in the adjustment hole (121). The eccentric part (142) of the eccentric wheel (14) is located in the elongated hole (36). The adjusting member (31) is threadedly connected to the adjusting hole (32). The bottom of the outer wall of the adjusting member (31) is provided with an annular groove (311). The base (13) is placed in the annular groove (311) through the U-shaped notch slot (33). When the eccentric wheel (14) rotates, the eccentric part (142) causes the base (13) to move and adjust relative to the arm body (12).

8. A hinge according to claim 7, characterized in that, The base (13) is provided with an elastic tongue (35), and the elongated hole (36) is opened on the elastic tongue (35). The wheel body (141) of the eccentric wheel (14) is clamped to the lower surface of the arm body (12) through the elastic tongue (35).

9. A hinge according to claim 7, characterized in that, The first locking hole (17), the adjustment hole (121), and the distance adjustment hole (32) are arranged in sequence from away from to near the cup head (11). When the distance adjustment member (31) is rotated, the locking member (15) serves as the fulcrum, and the arm body (12) and the base (13) rotate around the locking member (15).

10. A hinge according to claim 7, characterized in that, The outer top surface of the base (13) is provided with a toothed body (19). The extension direction of the toothed body (19) is perpendicular to the sliding direction of the base (13). The toothed body (19) abuts against the inner top surface of the arm body (12) to increase the friction between the arm body (12) and the base (13) in the locked state.

11. A hinge according to claim 10, characterized in that, The outer top surface of the base (13) is provided with a protrusion (20), the toothed body (19) is provided on the top surface of the protrusion (20), and the second locking hole (18) passes through the toothed body (19).

12. A hinge according to claim 10, characterized in that, The locking element (15) is a screw, and the distance difference between the outer edge of the bottom surface of the long groove (16) and the edge of the opening of the first locking hole (17) is equal to the radius difference between the screw head (151) and the screw (152) of the eccentric wheel (14).

13. A hinge according to claim 2, characterized in that, It also includes a cylindrical part (37) and a cylindrical shaft (38), the cylindrical shaft (38) being connected to the inner rocker arm (22), the cylindrical part (37) being sleeved on the outside of the cylindrical shaft (38), and the outer ring surface of the cylindrical part (37) abutting against the lever arm of the torsion spring (28).

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