Adjustable hinge

Abstract

This utility model discloses an adjustable clearance hinge in the field of hinge technology, including an eccentric arc connecting rod and an eccentric pivot. Compared to traditional pivots located at the geometric center of the door panel and door frame, the eccentric pivot is arranged towards the inside of the door frame and along the opening direction. The head of the eccentric arc connecting rod has an annular mounting hole, and the eccentric pivot is axially hinged inside the annular mounting hole. By employing an eccentrically arranged eccentric pivot, an eccentric arc connecting rod adapted to the clearance trajectory of the door frame, and an axial hinge structure between the annular mounting hole and the second and third leaf plates, the mechanical structure of the hinge and the movement trajectory of the door panel are optimized. When the door panel opens and closes, the eccentric arc connecting rod strictly follows the preset trajectory, highly matching the clearance design of the door frame, effectively avoiding interference and collision, and improving the smoothness and stability of the door panel opening and closing. Simultaneously, it optimizes the door's spatial layout, reduces the occupation of surrounding space, and significantly improves the overall space utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hinge technology, and in particular to an adjustable yielding hinge. Background Technology

[0002] In the fields of building decoration and furniture manufacturing, the precision and flexibility of door installation have always been key considerations. Ensuring the parallelism between the door panel and frame using traditional installation methods is no easy task. Factors such as construction errors and material deformation often lead to uneven gaps and difficulty in opening and closing the door after installation. Furthermore, different spaces have varying requirements for door opening angles. For example, in narrow corridors, a 180-degree opening is desired to save space; in certain areas, a stable 90-degree limit is required. To solve these long-standing industry challenges and meet the increasing demands for refined installation and diverse usage, the development of technologies and devices with precise parallel adjustment and multi-angle limiting functions has become an inevitable trend.

[0003] Existing hinge systems reveal significant functional limitations when the door is opened to 90 degrees. In areas such as narrow hallways in small apartments, compact kitchens, or space-efficient office partitions, the extra space occupied by the thickness of the door side when opened to 90 degrees is considerable. This not only risks collisions during frequent passage, affecting the smooth flow of movement, but also makes it difficult to rationally place furniture, equipment, or daily necessities in the already limited space, greatly limiting the effective use of space and making the already cramped space even more strained. This defect in hinges significantly reduces the practicality of these areas. We propose an adjustable yielding hinge to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Therefore, the purpose of this utility model is to provide an adjustable yielding hinge that can solve the obvious functional shortcomings of existing hinge devices when the door panel is opened to 90 degrees. In areas such as narrow passageways in small apartments, compact kitchens, or office partitions with extreme space utilization, the extra space occupied by the thickness of the door panel's sides when the door panel is opened to 90 degrees is not to be underestimated. This not only may lead to collisions when people pass through frequently, affecting the smoothness of movement, but also makes it difficult to reasonably place furniture, equipment, or daily necessities in the surrounding limited space, greatly limiting the effective use of space and making the already tight space even more cramped. The practicality of these areas is greatly reduced due to this defect of the hinge.

[0006] To solve the above-mentioned technical problems, this utility model provides an adjustable clearance hinge, which adopts the following technical solution: it includes an eccentric arc connecting rod and an eccentric rotating shaft. Compared with the traditional rotating shaft set at the geometric center of the door panel and the door frame, the eccentric rotating shaft is arranged towards the inside of the door frame and along the opening direction. The head of the eccentric arc connecting rod is provided with an annular mounting through hole, and the eccentric rotating shaft is axially hinged inside the annular mounting through hole. The eccentric arc connecting rod has a curved structure with a straight bottom and a top that gradually changes to an open downward semi-circular arc, and its curvature matches the clearance trajectory of the door frame.

[0007] Optionally, the upper and lower ends of the annular mounting through hole are axially hinged to the second and third leaf pieces respectively through an eccentric rotating shaft. The second and third leaf pieces adopt the same structure and are symmetrically arranged above and below the vertical line of the axis of the annular mounting through hole.

[0008] Optionally, it also includes a first leaf, which is fixedly connected to a fastening plate perpendicular to its own plane by a fusion welding process; a support rib is provided between the fastening plate and the first leaf, and the support rib between the fastening plate and the first leaf is integrally welded with thickened plate material and its inclined angle is consistent with the load-bearing direction of the door panel, so as to distribute the torsional load when the hinge rotates.

[0009] Optionally, the fastening plate is fastened to the eccentric arc connecting rod on the left side by bolts and nuts; the bottom of the eccentric arc connecting rod is a straight section that extends from bottom to top and then bends smoothly to form a downward-facing semi-circular arc shape; the top of the eccentric arc connecting rod is provided with an annular mounting through hole.

[0010] Optionally, the door panel is installed at the rear of the first leaf using bolts, and the door panel has a groove in which the first leaf is embedded; the door frame is installed at the front of the second and third leaf using bolts.

[0011] Optionally, a clearance groove is provided on the side wall of the door frame facing the inner side of the door panel to conform to the movement trajectory of the arc-shaped connecting rod. A clearance notch with a width greater than the length of the straight section of the arc-shaped connecting rod extends from the right side of the clearance groove. When the door panel is opened to 90°, the arc-shaped connecting rod is completely accommodated in the clearance groove and the notch, so that the outer surface of the door panel is flush with the side wall of the door frame.

[0012] Optionally, a number of corner limiting blocks are fixed around the annular mounting through hole by welding. Each corner limiting block has an arc groove on its left and rear sides that matches the shape of the limiting block of the limiting device, so as to achieve limiting fit at 90° and 180° opening and closing angles.

[0013] Optionally, a limiting device that cooperates with several corner limiting blocks is fastened to the front of the eccentric rotating shaft. The limiting device has a limiting block that is movably installed inside through a limiting structure. The limiting block can move linearly within the limiting device. The head shape of the limiting block matches the arc groove on the corner limiting block.

[0014] Optionally, a high-strength return spring in the shape of a square top view is installed at the connection between the limiting device and the limiting block; when the door panel rotates to 90° or 180°, the high-strength return spring releases elastic potential energy, driving the limiting block to embed into the arc groove of the corner limiting block, thereby realizing the limiting function at a specific angle.

[0015] In summary, this utility model has at least one of the following beneficial effects: 1. By employing an eccentrically arranged eccentric rotating shaft and an eccentrically curved connecting rod whose curvature adapts to the clearance trajectory of the door frame, as well as an annular mounting through hole and an axial hinge structure for the second and third leaf plates, the purpose of optimizing the hinge mechanical structure and the door panel movement trajectory is achieved. During the mechanical action of opening and closing the door panel, the eccentrically curved connecting rod strictly follows the preset kinematic trajectory, and its movement path achieves a high degree of geometric fit with the clearance design of the door frame. This precise trajectory control effectively avoids interference and collision between the eccentrically curved connecting rod and the door frame during movement, improving the smoothness and stability of the door panel opening and closing from a mechanical dynamics perspective. At the same time, this design optimizes the layout of the door in space, reduces the occupation of surrounding space during opening and closing, significantly improves the overall space utilization efficiency, and provides mechanical structural protection for the efficient use of building space.

[0016] 2. By incorporating support ribs made of thickened sheet metal welded together with an angled bevel adapted to the load-bearing direction of the door panel, and installing a high-strength return spring in a square top-view shape in conjunction with a corner limit block, the design enhances the hinge's structural stability and precisely controls the door panel's opening and closing angle. During hinge rotation, the support ribs effectively distribute torsional loads based on mechanical principles, improving the hinge's load-bearing capacity and structural durability. When the door panel rotates to a specific angle of 90° or 180°, the high-strength return spring releases its elastic potential energy, precisely driving the limit block to engage with the arc-shaped groove of the corner limit block, achieving precise angle control based on mechanical limiting principles. This design ensures the accuracy of the door panel's opening and closing angle, improves the safety and stability of the door, and meets the requirements for door opening and closing precision in practical applications. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 The diagram shows the overall structure of the adjustable yielding hinge of this utility model in multiple working conditions, including the closed state, the 90° open state, and the 180° open state.

[0020] Figure 3 This is a detailed enlarged view of the partially cut-off structure and limiting device of the adjustable clearance hinge of this utility model;

[0021] Figure 4 This is a close-up of the structure of the adjustable clearance hinge of this utility model in the closed, 90° open and 180° open states, and an enlarged view of the dynamic operation of the limiting device.

[0022] Explanation of reference numerals in the attached drawings: 1. Offset connecting rod; 2. Eccentric rotating shaft; 3. Annular mounting through hole; 4. Second leaf plate; 5. Third leaf plate; 6. First leaf plate; 7. Fastening plate; 8. Support rib; 9. Bolt; 10. Nut; 11. Door panel; 12. Groove; 13. Door frame; 14. Clearance groove; 15. Clearance notch; 16. Corner limiting block; 17. Limiting device; 18. Limiting block; 19. Circular groove; 20. High-strength return spring. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0024] Example 1, refer to Figure 1-4 In this embodiment, to address the significant functional shortcomings of existing hinge devices when the door panel is opened to 90 degrees, this invention discloses an adjustable yielding hinge. In areas such as narrow passageways in small apartments, compact kitchens, or space-efficient office partitions, the extra space occupied by the thickness of the door panel's sides when opened to 90 degrees is considerable. This not only may lead to collisions during frequent passage, affecting the smoothness of movement, but also makes it difficult to rationally place furniture, equipment, or daily necessities in the already limited space, greatly limiting the effective use of space and making the already cramped space even more strained. This defect in hinges significantly reduces the practicality of these areas.

[0025] The system includes an eccentric connecting rod 1 and an eccentric rotating shaft 2. Unlike traditional rotating shafts located at the geometric center of the door panel 11 and door frame 13, the eccentric rotating shaft 2 is positioned inwards towards the door frame 13 and along the opening direction. The head of the eccentric connecting rod 1 has an annular mounting hole 3, and the eccentric rotating shaft 2 is axially hinged inside the annular mounting hole 3. The eccentric connecting rod 1 has a curved structure with a straight bottom and a gradually changing top that opens downwards into a semi-circular arc, and its curvature matches the clearance trajectory of the door frame 13. This is achieved by installing the eccentric rotating shaft 2, which is eccentrically positioned inwards towards the door frame 13 and along the opening direction. The device includes an anular mounting hole 3 at the head, which is axially hinged to the eccentric rotating shaft 2. The device has a straight bottom and a gradually opening, downward-facing semi-circular curved structure at the top, with the curvature matching the clearance trajectory of the door frame 13. This design optimizes the opening and closing space utilization and movement trajectory of the door panel 11. During the opening and closing process of the door panel 11, the eccentric connecting rod 1 moves according to a specific trajectory, precisely matching the clearance requirements of the door frame 13. This effectively avoids interference with the door frame 13, making the door panel 11 open more smoothly and improving the overall space utilization efficiency.

[0026] The upper and lower ends of the annular mounting through hole 3 are axially hinged to the second leaf piece 4 and the third leaf piece 5 respectively via the eccentric rotating shaft 2. The second leaf piece 4 and the third leaf piece 5 adopt the same structure and are symmetrically arranged above and below the vertical line of the axis of the annular mounting through hole 3. By using the eccentric rotating shaft 2 to axially hinge the upper and lower ends of the annular mounting through hole 3 to the second leaf piece 4 and the third leaf piece 5, which adopt the same structure and are symmetrically arranged above and below the vertical line of the axis of the annular mounting through hole 3, the purpose of constructing a symmetrical and stable rotation structure is achieved. This ensures that the door panel 11 is subjected to uniform force on both sides during the opening and closing process, and the rotation is more stable and smooth. This guarantees the overall structural stability and reliability of the hinge and improves the user experience.

[0027] It also includes a first leaf piece 6, which is fixedly connected to a fastening plate 7 perpendicular to its own plane by a fusion welding process. A support rib 8 is provided between the fastening plate 7 and the first leaf piece 6. The support rib 8 between the fastening plate 7 and the first leaf piece 6 is made of thickened plate material and welded together, and its inclined side angle is consistent with the load-bearing direction of the door panel 11. It is used to distribute the torsional load when the hinge rotates. By setting the first leaf piece 6 and fixing it to the fastening plate 7 perpendicular to its own plane by a fusion welding process, and at the same time installing the support rib 8 made of thickened plate material and welded together between the fastening plate 7 and the first leaf piece 6, the purpose of strengthening the connection structure between the first leaf piece 6 and the fastening plate 7 and improving the load-bearing capacity is achieved. It effectively distributes the torsional load generated when the hinge rotates, enhances the overall stability of the hinge, extends its service life, and ensures the stable operation of the hinge in frequent use.

[0028] The fastening plate 7 is fastened to the eccentric arc connecting rod 1 on the left side by bolts 9 and nuts 10. The bottom of the eccentric arc connecting rod 1 is a straight rod section that extends upwards and then bends smoothly to form a downward-facing semi-circular arc. The top of the eccentric arc connecting rod 1 is provided with an annular mounting through hole 3. By fastening the fastening plate 7 to the eccentric arc connecting rod 1 on the left side with bolts 9 and nuts 10, the eccentric arc connecting rod 1 is fastened to the eccentric arc connecting rod 1. The bottom of the eccentric arc connecting rod 1 is a straight rod section that extends upwards and smoothly transitions to form a downward-facing semi-circular arc with an annular mounting through hole 3 at the top. This achieves the purpose of constructing a stable connection and a specific motion trajectory structure. It enables the eccentric arc connecting rod 1 to be firmly connected to the fastening plate 7 and to move along a specific trajectory according to its own shape when the hinge is in operation. This provides precise guidance for the opening and closing of the door panel 11, ensures that the hinge function is normal, and improves the smoothness and stability of opening and closing.

[0029] The door panel 11 is installed directly behind the first leaf 6 using bolts 9. The door panel 11 has a groove 12 machined on it, and the first leaf 6 is embedded in the groove 12. The door frame 13 is installed directly in front of the second leaf 4 and the third leaf 5 using bolts 9. By installing the first leaf 6 directly behind the door panel 11 in the pre-machined groove 12 on the door panel 11 using bolts 9, and by installing the door frame 13 directly in front of the second leaf 4 and the third leaf 5 using bolts 9, the purpose of reliably connecting the hinge to the door panel 11 and the door frame 13 is achieved. This ensures that the door panel 11 and the door frame 13 are firmly connected to the corresponding hinge leaves, ensuring that the hinge can effectively transmit force during the opening and closing of the door panel 11, ensuring smooth opening and closing of the door, and improving the overall structural stability and connection firmness.

[0030] A clearance groove 14, conforming to the movement trajectory of the curved connecting rod 1, is provided on the side wall of the door frame 13 facing the inside of the door panel 11. A clearance notch 15, wider than the length of the straight section of the curved connecting rod 1, extends from the right side of the clearance groove 14. When the door panel 11 is opened to 90°, the curved connecting rod 1 is completely accommodated within the clearance groove 14 and the notch, making the outer surface of the door panel 11 flush with the side wall of the door frame 13. This is achieved by providing a clearance groove 14 on the side wall of the door frame 13 facing the inside of the door panel 11 to conform to the movement trajectory of the curved connecting rod 1. Furthermore, an avoidance notch 15 with a width greater than the length of the straight section of the eccentric arc connecting rod 1 extends from the right side of the clearance groove 14. This achieves the purpose of providing precise clearance space for the eccentric arc connecting rod 1 during the opening and closing of the door panel 11. When the door panel 11 is opened to 90°, the eccentric arc connecting rod 1 can be completely accommodated in the clearance groove 14 and the notch, making the outer surface of the door panel 11 flush with the side wall of the door frame 13. This optimizes space utilization, avoids space obstruction caused by protruding components, and enhances the overall aesthetics and practicality of the door.

[0031] Several corner limiting blocks 16 are fixed around the annular mounting through hole 3 by welding. Each corner limiting block 16 has an arc groove 19 on its left and rear sides that matches the shape of the limiting block 18 of the limiting device 17. This is used to achieve limiting fit at 90° and 180° opening and closing angles. By fixing several corner limiting blocks 16 around the annular mounting through hole 3 by welding, and machining arc grooves 19 on the left and rear sides of each corner limiting block 16 that match the shape of the limiting block 18 of the limiting device 17, the purpose of precisely limiting the opening and closing angle of the door panel 11 is achieved. This ensures that when the door panel 11 rotates to 90° and 180°, the limiting block 18 in the limiting device 17 can fit tightly with the arc groove 19 of the corner limiting block 16, preventing the door panel 11 from continuing to rotate. This ensures that the opening and closing angle of the door panel 11 is precisely controlled, improving the safety and stability of the door.

[0032] A limiting device 17, which mates with several corner limiting blocks 16, is fastened to the front of the eccentric rotating shaft 2. A limiting block 18 is movably mounted inside the limiting device 17 via a limiting structure. The limiting block 18 can move linearly within the limiting device 17. The head shape of the limiting block 18 matches the arc groove 19 on the corner limiting block 16. By fastening the limiting device 17, which mates with several corner limiting blocks 16, to the front of the eccentric rotating shaft 2, and by providing a limiting mechanism inside the limiting device 17 that allows the limiting block 18 to move linearly... The limiting block 18 is installed in a position structure and is movably mounted, and the shape of the head of the limiting block 18 matches the arc groove 19 on the corner limiting block 16. This achieves the purpose of precisely controlling the opening and closing angle of the door panel 11. When the door panel 11 rotates to a specific angle, the limiting block 18 can move linearly within the limiting device 17 and accurately embed into the arc groove 19 of the corner limiting block 16, effectively preventing the door panel 11 from continuing to rotate, ensuring that the opening and closing angle of the door panel 11 is accurate, and greatly improving the stability and safety of the door opening and closing.

[0033] A high-strength return spring 20 in a square top view shape is installed at the connection between the limiting device 17 and the limiting block 18. When the door panel 11 rotates to 90° or 180°, the high-strength return spring 20 releases its elastic potential energy, driving the limiting block 18 to embed into the arc groove 19 of the corner limiting block 16, thereby achieving the limiting function at a specific angle. By installing a high-strength return spring 20 in a square top view shape at the connection between the limiting device 17 and the limiting block 18, the purpose of providing the limiting block 18 with the power to automatically embed into the groove 12 of the corner limiting block 16 is achieved. This ensures that when the door panel 11 rotates to 90° or 180°, the high-strength return spring 20 releases its elastic potential energy in a timely manner, quickly driving the limiting block 18 to accurately embed into the arc groove 19 of the corner limiting block 16, efficiently completing the limiting action at a specific angle, ensuring the accuracy and stability of the opening and closing angle of the door panel 11, and enhancing the reliability of the hinge.

[0034] The innovative principle and advantages of the eccentric hinge design: The hinge of a traditional hinge is usually located in the middle between the door panel 11 and the door frame 13, and the door opens in a conventional circular motion with the hinge as the center. However, the "eccentric hinge 2" of this patent is located inside the door frame 13 and is eccentrically arranged along the opening direction. This change makes the opening trajectory of the door panel 11 no longer traditional. In conjunction with the eccentric arc connecting rod 1, it can flexibly and accurately make way according to the special starting point and trajectory given by the eccentric arc shape. In narrow scenarios or scenarios with special requirements for space utilization, it can effectively avoid surrounding obstacles and improve the practicality of door opening and closing and spatial adaptability.

[0035] The specific working principle is as follows: By employing an eccentrically arranged eccentric rotating shaft 2 and an eccentrically curved connecting rod 1 whose curvature adapts to the clearance trajectory of the door frame 13, as well as the axial hinge structure of the annular mounting through hole 3 and the second and third leaf plates, the aim of optimizing the hinge mechanical structure and the movement trajectory of the door panel 11 is achieved. During the mechanical action of opening and closing the door panel 11, the eccentrically curved connecting rod 1 strictly follows the preset kinematic trajectory, and its movement path achieves a high degree of geometric fit with the clearance design of the door frame 13. This precise trajectory control effectively avoids interference and collision between the eccentrically curved connecting rod 1 and the door frame 13 during movement, improving the smoothness and stability of the opening and closing of the door panel 11 from a mechanical dynamics perspective. At the same time, this design optimizes the layout of the door in space, reduces the occupation of surrounding space during opening and closing, significantly improves the overall space utilization efficiency, and provides mechanical structural guarantees for the efficient use of building space. By incorporating a support rib 8, integrally welded from thickened sheet metal with an angled bevel adapted to the load-bearing direction of the door panel 11, and a structure consisting of a high-strength return spring 20 in a square top-view shape cooperating with the corner limit block 16, the design enhances the hinge's structural stability and precisely controls the opening angle of the door panel 11. During hinge rotation, the support rib 8 effectively disperses torsional loads based on mechanical principles, improving the hinge's load-bearing capacity and structural durability. When the door panel 11 rotates to a specific angle of 90° or 180°, the high-strength return spring 20 releases its elastic potential energy, precisely driving the limit block 18 into the arc-shaped groove 19 of the corner limit block 16, achieving precise angle control based on the mechanical limit principle. This design ensures the accuracy of the door panel 11's opening angle, improves the safety and stability of the door, and meets the requirements for door opening and closing precision in practical applications.

[0036] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An adjustable swing-away hinge comprising an eccentric link (1) and an eccentric pivot (2), characterized in that: Compared to the traditional pivots set at the geometric center of the door panel (11) and the door frame (13), the eccentric pivot (2) is arranged towards the inside of the door frame (13) and along the opening direction; the head of the eccentric arc connecting rod (1) is provided with an annular mounting through hole (3), and the eccentric pivot (2) is axially hinged inside the annular mounting through hole (3); the eccentric arc connecting rod (1) has a curved structure with a straight bottom and a top that gradually changes to an open downward semi-circular arc, and its curvature matches the clearance trajectory of the door frame (13); The door frame (13) has a relief groove (14) on the side wall facing the inside of the door panel (11) to adapt to the movement trajectory of the arc-shaped connecting rod (1). The right side of the relief groove (14) extends a clearance notch (15) with a width greater than the length of the straight rod section of the arc-shaped connecting rod (1). When the door panel (11) is opened to 90°, the arc-shaped connecting rod (1) is completely accommodated in the relief groove (14) and the notch, so that the outer surface of the door panel (11) is flush with the side wall of the door frame (13).

2. A hinge according to claim 1, wherein: The upper and lower ends of the annular mounting through hole (3) are axially hinged to the second leaf (4) and the third leaf (5) respectively through the eccentric rotating shaft (2). The second leaf (4) and the third leaf (5) adopt the same structure and are symmetrically arranged above and below the vertical line of the axis of the annular mounting through hole (3).

3. A hinge according to claim 2, wherein: It also includes a first leaf piece (6), which is fixedly connected to a fastening plate (7) perpendicular to its own plane by a fusion welding process; a support rib (8) is provided between the fastening plate (7) and the first leaf piece (6), and the support rib (8) between the fastening plate (7) and the first leaf piece (6) is integrally welded with thickened plate and its inclined angle is consistent with the load-bearing direction of the door panel (11), which is used to distribute the torsional load when the hinge rotates.

4. An adjustable swing-away hinge according to claim 3, wherein: The fastening plate (7) is fastened to the left side by bolts (9) and nuts (10) and the eccentric arc connecting rod (1); the bottom of the eccentric arc connecting rod (1) is a straight rod section that extends from bottom to top and then bends smoothly to form a semi-circular arc with the opening facing downwards; the top of the eccentric arc connecting rod (1) is provided with an annular mounting through hole (3).

5. An adjustable swing-away hinge according to claim 4 wherein: The door panel (11) is installed directly behind the first leaf piece (6) by bolts (9). The door panel (11) has a groove (12) and the first leaf piece (6) is embedded in the groove (12). The door frame (13) is installed directly in front of the second leaf piece (4) and the third leaf piece (5) by bolts (9).

6. An adjustable clearance hinge according to claim 2, characterized in that: The annular mounting through hole (3) is surrounded by several corner limiting blocks (16) by welding. Each corner limiting block (16) has a circular arc groove (19) on its left and rear sides to achieve limiting fit at 90° and 180° opening and closing angles.

7. An adjustable swing-away hinge according to claim 6 wherein: The eccentric rotating shaft (2) is fastened with a limiting device (17) that cooperates with several corner limiting blocks (16) in front. The limiting device (17) has a limiting block (18) installed inside through a limiting structure. The limiting block (18) can move linearly within the limiting device (17). The head shape of the limiting block (18) matches the arc groove (19) on the corner limiting block (16).

8. An adjustable swing-away hinge according to claim 7, wherein: A high-strength reset spring (20) in the shape of a square top view is installed at the connection between the limiting device (17) and the limiting block (18); when the door panel (11) rotates to 90° or 180°, the high-strength reset spring (20) releases elastic potential energy, driving the limiting block (18) to embed into the arc groove (19) of the corner limiting block (16) to achieve the limiting function of a specific angle.

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