Upturning door hinge

Abstract

An upturning door hinge comprises a base fixed in a cabinet body and a door seat fixed on a cabinet door, a first hinge arm and a second hinge arm are installed in the base in a hinged mode, and the second hinge arm is hinged to the door seat through a third hinge arm and a fourth hinge arm. The other end of the first hinge arm is hinged with the middle part of the third hinge arm; a driving arm is installed in the second hinge arm in a hinged mode, one end of the driving arm is in threaded connection with an adjusting bolt arranged in the second hinge arm, and the other end of the second hinge arm is installed in a guide groove in the second hinge arm in a sliding mode through a guide column. The linkage arm is hinged in the base, one end of the linkage arm is hinged with the pull rod, and the other end of the pull rod is hinged with the guide post; a spring guide rod is further installed in the base in a hinged mode, the spring guide rod is sleeved with a pre-pressing spring, one end of the spring guide rod is sleeved with a spring pressing plate, and the pre-pressing spring reversely drives the second hinge arm to move through the spring pressing plate, the linkage arm and the pull rod so as to provide door opening assistance when the hinge is opened.

Description

Technical Field

[0001] This invention relates to a hardware hinge, specifically an upward-opening door hinge. Background Technology

[0002] Currently, in the furniture industry, especially in kitchen and cabinet products, there are various types of door opening and closing mechanisms. Among them, the upward-opening door hinge is a common and widely used opening and closing mechanism. An upward-opening door hinge connects the cabinet body and the door via a hinge arm, allowing the door to flip upwards when opened, creating an angle between the door and the cabinet body for easy access to items. Existing upward-opening door hinge structures generally employ multi-link mechanisms, enabling the door to open and close relatively smoothly.

[0003] However, although existing technology can provide some assistance in opening doors, making it easier for users to flip cabinet doors, there are still several obvious drawbacks and shortcomings: 1. Existing lift-up door hinges mostly use fixed springs or pneumatic support structures to provide opening assistance. However, these spring forces are usually preset and cannot be adjusted according to the weight of the door. This results in the following situation: when the door is light, excessive spring force causes the cabinet door to bounce too quickly during opening, making it difficult to control the opening speed; while when the door is heavy, the preset spring force may not provide sufficient opening assistance, causing users to struggle to open the door. For cabinet doors of different thicknesses, materials, or sizes, the opening assistance of existing hinges cannot adapt to different body shapes, lacking flexibility.

[0004] 2. Existing upward-opening door hinges are typically designed as standardized products, suitable for a certain range of door weights. However, because the assistance from springs or pneumatic supports cannot be adjusted, they cannot fully adapt to doors of different weights. For example, for heavier cabinet doors, the lack of sufficient assistance makes it difficult for users to open the door, resulting in a poor user experience; while for lighter cabinet doors, excessive assistance can cause the door to spring up too quickly when opening, increasing the impact on the door and potentially affecting the lifespan of the door and hinges.

[0005] 3. In existing technologies, due to the non-adjustable spring force, the opening speed is often difficult to control precisely. In some situations, users need to adjust the opening speed according to different usage environments or personal habits, but existing upward-opening door hinges, due to structural limitations, usually cannot achieve this. This lack of elasticity and flexibility can easily lead to sudden opening and closing of the door during use, increasing potential safety hazards. Therefore, further improvements are necessary. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a lift-up door hinge that is simple in structure, easy to use, has an opening spring force that can be adjusted according to the weight of the door, can effectively control the opening and closing speed, and provides a smoother opening and closing experience.

[0007] The purpose of this invention is achieved in the following way: an upward-opening door hinge, which includes a base fixed in the cabinet body and a door seat fixed on the cabinet door, wherein a first hinge arm and a second hinge arm are hingedly installed in the base, and the second hinge arm is hinged to the door seat through a third hinge arm and a fourth hinge arm. The second, third and fourth hinge arms form a four-bar linkage with the door seat. The relative movement between each hinge arm realizes the relative displacement between the door seat and the base. The other end of the first hinge arm is hinged to the middle of the third hinge arm. The second hinge arm is hinged to a drive arm. One end of the drive arm is screwed to an adjusting bolt located inside the second hinge arm. The other end of the second hinge arm is slidably mounted in a guide groove located on the second hinge arm via a guide post. It also includes a connecting arm that is hinged to the base, with one end of the connecting arm hinged to the pull rod and the other end of the pull rod hinged to the guide post. The base is also hinged with a spring guide rod, and a preloaded spring is fitted on the outside of the spring guide rod. A spring pressure plate is fitted on one end of the spring guide rod, and the spring pressure plate presses against one end of the preloaded spring. The other end of the connecting arm is hinged to the spring pressure plate. The preloaded spring drives the second hinge arm to move in the opposite direction through the spring pressure plate, the connecting arm and the pull rod, so as to provide door opening assistance when the hinge is opened.

[0008] Furthermore, the second hinge arm is provided with an adjustment hole, through which an adjustment bolt passes and is screwed to an adjustment nut located at the end of the drive arm.

[0009] Furthermore, the bottom of the second hinge arm is provided with a concave adjustment platform, and the adjustment hole is located inside the adjustment platform.

[0010] Furthermore: the spring guide rod is provided with a limiting groove, and the spring pressure plate is provided with a limiting shaft. The limiting shaft is inserted into the limiting groove, and the spring pressure plate is installed on the spring guide rod to limit the relative displacement between the spring pressure plate and the spring guide rod.

[0011] Furthermore: the limiting shaft is provided with both ends protruding from the end faces of the spring pressure plate, and the connecting arm is hinged to the spring pressure plate through the limiting shaft.

[0012] Furthermore: the connecting arm is provided with two pieces, which are connected by a base plate to form a clamping area between the two connecting arms, and the pull rod and spring pressure plate are clamped and installed in the clamping area.

[0013] Furthermore: a door closing buffer is installed inside the second hinge arm. The door closing buffer extends into the movement path of the fourth hinge arm. When the hinge is closed, the door closing buffer is pressed against the fourth hinge arm to slow down the closing speed.

[0014] Furthermore: the door closing buffer is a hydraulic damper, and a door closing guide sleeve is fixedly installed inside the second hinge arm, with the door closing buffer inserted into the door closing guide sleeve.

[0015] Furthermore, the fourth hinge arm is equipped with a door opening buffer that extends into the movement path of the third hinge arm. When the hinge is opened, the door opening buffer is pressed against the third hinge arm to slow down the opening speed.

[0016] Furthermore: the door opening buffer is a hydraulic damper, and a door opening guide sleeve is fixedly installed inside the fourth hinge arm, with the door opening buffer inserted into the door opening guide sleeve.

[0017] The beneficial effects of this invention are: 1. Simple structure, low production cost, and improved market competitiveness.

[0018] 2. This invention, by incorporating an adjusting bolt and a preload spring within the second hinge arm, allows the door opening force to be adjusted according to the weight of the cabinet door. The adjusting bolt is connected to the drive arm; by rotating the adjusting bolt, the compression of the preload spring can be precisely adjusted, thereby changing the spring force. This design allows users to flexibly adjust the door opening assistance according to the weight of the door, ensuring that the door opens smoothly under any weight, without affecting the user experience due to excessive or insufficient spring force.

[0019] 3. Due to its adjustable spring force, the upward-opening door hinge of this invention can adapt to doors of different weights. Whether it is a lightweight or heavy cabinet door, the appropriate opening assistance can be provided by adjusting the spring force, ensuring that the door remains smooth and gentle during opening. Compared with traditional hinges that cannot adjust the spring force, this invention greatly expands the applicability of the hinge, meeting the needs of doors of different materials and sizes.

[0020] 4. The hinge of this invention is equipped with buffer devices for both opening and closing. By installing opening buffers and closing buffers in the second and fourth hinge arms respectively, the door can be buffered during opening and closing, avoiding sudden opening or closing and preventing impact caused by excessive speed. This not only improves the safety of the door but also extends the service life of the hinge.

[0021] 5. This invention, through the combined design of the connecting arm, pull rod, and spring guide rod, forms a stable force transmission mechanism, enabling the preloaded spring to provide opening assistance to the door through the spring pressure plate and connecting arm. This design ensures reliable force transmission and avoids insufficient assistance or failure due to unreasonable structural design. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hinge in the open state in this invention.

[0023] Figure 2 This is a schematic diagram of the hinge in the closed state in this invention.

[0024] Figure 3 This is an exploded view of the structure of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the present invention after the outer shell is hidden.

[0026] Figure 5 This is a schematic diagram showing the adjusting bolt in its tightest state in this invention.

[0027] Figure 6 This is a schematic diagram showing the adjusting bolt in its loosest state in this invention.

[0028] Figure 7 This is a cross-sectional view of the structure of the present invention. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings. A hinge for an upward-opening door includes a base 1 fixed in the cabinet body and a door seat 2 fixed on the cabinet door. A first hinge arm 3 and a second hinge arm 4 are hingedly installed in the base 1. The second hinge arm 4 is hinged to the door seat 2 through a third hinge arm 5 and a fourth hinge arm 6. The second hinge arm 4, the third hinge arm 5 and the fourth hinge arm 6 form a four-bar linkage with the door seat 2. The relative movement between each hinge arm realizes the relative displacement between the door seat 2 and the base 1. The other end of the first hinge arm 3 is hinged to the middle of the third hinge arm 5. The second hinge arm 4 is hingedly mounted with a drive arm 7. One end of the drive arm 7 is screwed to an adjusting bolt 8 located inside the second hinge arm 4. The other end of the second hinge arm 4 is slidably mounted in a guide groove 41 located on the second hinge arm 4 via a guide post 9. It also includes a connecting arm 10 hinged in the base 1, one end of the connecting arm 10 is hinged to the pull rod 11, and the other end of the pull rod 11 is hinged to the guide post 9. A spring guide rod 12 is also hinged inside the base 1. A preloaded spring 13 is fitted around the spring guide rod 12. A spring pressure plate 14 is fitted onto one end of the spring guide rod 12. The spring pressure plate 14 presses against one end of the preloaded spring 13. The other end of the connecting arm 10 is hinged to the spring pressure plate 14. The preloaded spring 13 drives the second hinge arm 4 to move in the opposite direction through the spring pressure plate 14, the connecting arm 10, and the pull rod 11, providing door opening assistance when the hinge is opened.

[0030] In one embodiment: the second hinge arm 4 is provided with an adjustment hole 42, and the adjustment bolt 8 passes through the adjustment hole 42 and is screwed to the adjustment nut 71 provided at the end of the drive arm 7.

[0031] In one embodiment: the bottom of the second hinge arm 4 is provided with a concave adjustment platform 43, and the adjustment hole 42 is provided in the adjustment platform 43.

[0032] In one embodiment: the spring guide rod 12 is provided with a limiting groove 15, and the spring pressure plate 14 is provided with a limiting shaft 16. The limiting shaft 16 is inserted into the limiting groove 15, and the spring pressure plate 14 is installed on the spring guide rod 12 to limit the relative displacement between the spring pressure plate 14 and the spring guide rod 12.

[0033] In one embodiment: the limiting shaft 16 is provided with both ends protruding from the end face of the spring pressure plate 14, and the connecting arm 10 is hinged to the spring pressure plate 14 through the limiting shaft 16.

[0034] In one embodiment: the connecting arm 10 is provided with two pieces, and the two connecting arms 10 are connected by a base plate 17, forming a clamping area 18 between the two connecting arms 10, and the pull rod 11 and the spring pressure plate 14 are clamped and installed in the clamping area 18.

[0035] In one embodiment: a door closing buffer 44 is installed inside the second hinge arm 4. The door closing buffer 44 extends into the movement path of the fourth hinge arm 6. When the hinge is closed, the door closing buffer 44 is pressed against the fourth hinge arm 6 to slow down the closing speed.

[0036] In one embodiment: the door closing buffer 44 is a hydraulic damper, and a door closing guide sleeve 45 is fixedly installed inside the second hinge arm 4, and the door closing buffer 44 is inserted into the door closing guide sleeve 45.

[0037] In one embodiment: a door opening buffer 61 is installed inside the fourth hinge arm 6. The door opening buffer 61 extends into the movement path of the third hinge arm 5. When the hinge is opened, the door opening buffer 61 is pressed against the third hinge arm 5 to slow down the opening speed.

[0038] In one embodiment: the door opening buffer 61 is a hydraulic damper, and a door opening guide sleeve 62 is fixedly installed inside the fourth hinge arm 6, and the door opening buffer 61 is inserted into the door opening guide sleeve 62.

[0039] Working Principle: The upward-opening door hinge of this invention relies primarily on a four-bar linkage to achieve smooth opening and closing of the door. This four-bar linkage consists of a base 1, a second hinge arm 4, a third hinge arm 5, and a fourth hinge arm 6, all hinged to the door seat 2. When the user pushes or pulls the door, the hinge arms within the four-bar linkage move relative to each other through their hinge points, causing relative displacement between the door seat 2 and the base 1, thus allowing the door to flip upwards at a certain angle. Throughout the flipping process, the four-bar linkage provides stable mechanical support, ensuring smooth and stable opening and closing of the door.

[0040] In this invention, a drive arm 7 and an adjusting bolt 8 are installed within the second hinge arm 4, and door opening assistance is provided through a spring guide rod 12 and a preload spring 13. When the door is closed, the preload spring 13 is compressed, storing energy for the opening process. When the user opens the door, the preload spring 13 drives the second hinge arm 4 in the opposite direction through the spring pressure plate 14, the connecting arm 10, and the pull rod 11, providing upward assistance, thereby reducing the force required for the user to open the door and maintaining the open state after the cabinet door is opened.

[0041] It is worth noting that the adjusting bolt 8 is screwed to the drive arm 7. Users can change the fulcrum position between the pull rod 11 and the second drive arm by rotating the adjusting bolt, thereby changing the compression of the preload spring when the hinge opens and closes, and thus adjusting the spring force. This design allows the hinge to be adjusted according to the door weight, ensuring that both lightweight and heavy doors receive appropriate opening assistance.

[0042] In addition, to prevent impact caused by excessive speed when the door opens and closes, the present invention provides a closing buffer 44 and an opening buffer 61 in the second hinge arm 4 and the fourth hinge arm 6, respectively. When the user closes the door, the fourth hinge arm 6 presses against the closing buffer 44 during its movement. The buffer provides resistance, thereby slowing down the closing speed and preventing noise or damage to the door due to rapid closing. Similarly, when the door opens, the third hinge arm 5 presses against the opening buffer 61, slowing down the opening speed and providing a smooth opening experience.

[0043] A limiting groove 15 is provided on the spring guide rod 12, while a limiting shaft 16 is provided on the spring pressure plate 14, with the limiting shaft inserted into the limiting groove. This design is used to limit the relative displacement between the spring pressure plate and the spring guide rod, ensuring that the spring guide rod can extend and retract within a specified range, preventing structural damage or failure due to excessive spring displacement. Simultaneously, the guide post 9 is slidably mounted on the second hinge arm 4 via a guide groove 41. The guide groove ensures the direction of movement of the guide post, keeping the entire hinge structure stable during opening and closing.

[0044] Compared to traditional technologies, one of the greatest technical advantages of this invention lies in its adjustable door opening assistance design. By adjusting the bolt 8 to control the elasticity of the preload spring 13, the user can adjust the hinge's door opening assistance according to the different weights of the door. This design solves the problem of fixed assistance in existing technologies, enabling the hinge to adapt to doors of different weights, providing a balanced door opening experience regardless of weight.

[0045] Meanwhile, through the rational design of the four-bar linkage, the hinge points between each hinge arm maintain good coordination during the opening and closing of the door, ensuring the smooth movement of the door during opening and closing and avoiding problems such as jamming and wobbling that may occur in traditional hinge designs. At the same time, the sliding guide groove 41 further improves the stability of the hinge and ensures the smooth operation of the entire structure.

[0046] Furthermore, by incorporating an opening buffer 61 and a closing buffer 44, this invention effectively controls the opening and closing speed of the door, preventing impacts caused by excessive speed during opening and closing. This not only improves the safety of the door but also extends the service life of the hinges and the door itself.

[0047] In summary, this invention features a compact design, with all components rationally arranged, occupying minimal space and facilitating installation. Furthermore, due to its adjustable elasticity, the hinge can adapt to doors of different sizes and weights, demonstrating strong applicability and wide applicability to various types of cabinet doors, thus enabling its widespread adoption.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A hinge for an upward-opening door, characterized in that: It includes a base (1) fixed inside the cabinet and a door seat (2) fixed on the cabinet door. The base (1) is hinged with a first hinge arm (3) and a second hinge arm (4). The second hinge arm (4) is hinged to the door seat (2) through a third hinge arm (5) and a fourth hinge arm (6). The second hinge arm (4), the third hinge arm (5) and the fourth hinge arm (6) form a four-bar linkage with the door seat (2). The relative movement between each hinge arm realizes the relative displacement between the door seat (2) and the base (1). The other end of the first hinge arm (3) is hinged to the middle of the third hinge arm (5); The second hinge arm (4) is hinged to a drive arm (7). One end of the drive arm (7) is screwed to an adjusting bolt (8) located in the second hinge arm (4). The other end of the second hinge arm (4) is slidably installed in a guide groove (41) located on the second hinge arm (4) via a guide post (9). It also includes a connecting arm (10) hinged in the base (1), one end of the connecting arm (10) is hinged to the pull rod (11), and the other end of the pull rod (11) is hinged to the guide post (9); The base (1) is also hinged to a spring guide rod (12), and a preload spring (13) is fitted on the outside of the spring guide rod (12). A spring pressure plate (14) is fitted on one end of the spring guide rod (12), and the spring pressure plate (14) presses on one end of the preload spring (13). The other end of the connecting arm (10) is hinged to the spring pressure plate (14). The preload spring (13) drives the second hinge arm (4) to move in the opposite direction through the spring pressure plate (14), the connecting arm (10) and the pull rod (11), providing door opening assistance when the hinge is opened.

2. The upward-opening door hinge according to claim 1, characterized in that: The second hinge arm (4) is provided with an adjustment hole (42), and the adjustment bolt (8) passes through the adjustment hole (42) and is screwed to the adjustment nut (71) provided at the end of the drive arm (7).

3. The upward-opening door hinge according to claim 2, characterized in that: The bottom of the second hinge arm (4) is provided with a concave adjustment platform (43), and the adjustment hole (42) is provided inside the adjustment platform (43).

4. The upward-opening door hinge according to claim 1, characterized in that: The spring guide rod (12) is provided with a limiting groove (15), and the spring pressure plate (14) is provided with a limiting shaft (16). The limiting shaft (16) is inserted into the limiting groove (15) and the spring pressure plate (14) is installed on the spring guide rod (12) to limit the relative displacement between the spring pressure plate (14) and the spring guide rod (12).

5. A hinge for an upward-opening door according to claim 4, characterized in that: The limiting shaft (16) is set at both ends protruding from the end face of the spring pressure plate (14), and the connecting arm (10) is hinged to the spring pressure plate (14) through the limiting shaft (16).

6. The upward-opening door hinge according to claim 1, characterized in that: The connecting arm (10) is provided with two pieces, which are connected by a base plate (17) to form a clamping area (18) between the two connecting arms (10). The pull rod (11) and the spring pressure plate (14) are clamped and installed in the clamping area (18).

7. The upward-opening door hinge according to claim 1, characterized in that: The second hinge arm (4) is equipped with a door closing buffer (44), which extends into the movement path of the fourth hinge arm (6). When the hinge is closed, the door closing buffer (44) and the fourth hinge arm (6) are squeezed together to slow down the closing speed.

8. A hinge for an upward-opening door according to claim 7, characterized in that: The door closing buffer (44) is a hydraulic damper. The door closing guide sleeve (45) is fixedly installed inside the second hinge arm (4), and the door closing buffer (44) is inserted into the door closing guide sleeve (45).

9. A hinge for an upward-opening door according to claim 1, characterized in that: The fourth hinge arm (6) is equipped with a door opening buffer (61). The door opening buffer (61) extends into the movement path of the third hinge arm (5). When the hinge is opened, the door opening buffer (61) and the third hinge arm (5) are squeezed together to slow down the opening speed.

10. A hinge for an upward-opening door according to claim 9, characterized in that: The door opening buffer (61) is a hydraulic damper. A door opening guide sleeve (62) is fixedly installed inside the fourth hinge arm (6), and the door opening buffer (61) is inserted into the door opening guide sleeve (62).

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