Double-spring power-assisted box door hinge

Abstract

A double-spring power-assisted box door hinge comprises a hinge arm, a containing cavity is formed in the hinge arm, a trigger is installed at one end of the containing cavity in a hinged mode, a first pull arm is further installed in the containing cavity, one end of the first pull arm is hinged to the trigger, and the other end of the first pull arm is connected with the hinge arm through a first tension spring. The first pull arm is further connected with a second pull arm, the other end of the second pull arm is connected with the hinge arm through a second tension spring, and the first tension spring and the second tension spring jointly pull the trigger to swing in the closing direction all the time. Compared with the prior art, the utility model has the beneficial effects that the two small springs are respectively connected to the first pull arm and the second pull arm, and the trigger is jointly pulled through the resultant force of the elastic forces of the two springs, so that the door body always swings towards the closing direction, and compared with a single-spring design, the double-spring design can provide larger reset elastic force while keeping the size smaller, so that the safety of the door body is improved. The spring is particularly suitable for opening and closing operation of a heavy box door or a cabinet door, and solves the problem that a heavy door body is difficult to reset due to insufficient elasticity of a traditional single spring.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hinge, in particular to a double-spring assisted box door hinge. BACKGROUND

[0002] As the core mechanical device connecting the box body and the door body, the hinge is widely used in household appliances, industrial equipment, automobiles, furniture and other fields, and its main function is to realize the opening and closing movement of the door body and provide certain assistance or reset function. In the prior art, a spring such as a tension spring is usually designed in the hinge to provide a reset force, so that the box door or cabinet door can realize automatic closing. However, the prior art has the following significant shortcomings in practical application:

[0003] 1. Insufficient reset spring force: In the existing hinge design, reset usually relies on a single tension spring to provide tension. This design can provide basic reset function when adapting to light box doors, but when facing heavy box doors or cabinet doors, the tension provided by a single tension spring is obviously insufficient, the reset effect is poor, which leads to slow closing or incomplete closing of the door body, reducing the convenience of use. In addition, when the door body is large in size and heavy in material, the tension requirement of the reset spring increases significantly, and the existing single tension spring design cannot meet the requirements.

[0004] 2. Limitation of spring size: In order to improve the reset ability, the diameter or length of the tension spring is usually increased in the existing design to enhance the tension. However, this way will directly lead to the increase of the overall size of the hinge: the increased spring needs more space for accommodation, which directly affects the compactness of the hinge structure, leading to the oversize of the hinge body, which is difficult to adapt to compact equipment or small box body.

[0005] 3. Affecting the appearance: Especially in household appliances or high-end equipment, the increased hinge may lead to protrusion or incoordination of the appearance, which seriously affects the appearance of the overall product, so it is necessary to make further improvement. INVENTION CONTENTS

[0006] The utility model aims at overcoming the shortcomings of the prior art, and provides a double-spring assisted box door hinge which is simple in structure, convenient to use, strong in reset spring force, small in size and wide in adaptability.

[0007] The utility model aims at overcoming the shortcomings of the prior art, and provides a double-spring assisted box door hinge which is simple in structure, convenient to use, strong in reset spring force, small in size and wide in adaptability.

[0008] The first pull arm is further connected with a second pull arm, and the other end of the second pull arm is connected with the hinge arm through a second pull spring.

[0009] Further, a first guide slot is formed in the hinge arm, one end of the first pull arm is provided with a first sliding shaft, and the first sliding shaft is slidingly installed in the first guide slot.

[0010] Further, a first spring pin is further arranged on the hinge arm, a second guide slot is arranged on the second pull arm in correspondence with the position of the first spring pin, the second guide slot is sleeved outside the first spring pin, and one end of the first pull spring is connected to the first spring pin.

[0011] Further, a second guide slot is formed in the hinge arm, one end of the second pull arm is provided with a second sliding shaft, and the second sliding shaft is slidingly installed in the second guide slot, and one end of the second pull spring is connected to the second sliding shaft.

[0012] Further, a second spring pin is further arranged on the hinge arm, and one end of the second pull spring is connected to the second spring pin.

[0013] Further, the two ends of the first pull spring and the second pull spring are sleeved on a pull spring hanging plate, and the pull spring hanging plate is provided with a hook and a mounting hole.

[0014] Further, a plurality of spiral grooves are formed in the end face of the pull spring hanging plate, and the first pull spring or the second pull spring is clamped in the spiral groove.

[0015] Further, a guide table is arranged on the side wall of the trigger in the direction of the hinge arm, and a third guide slot is arranged on the hinge arm in correspondence, a pulley is slidingly installed in the third guide slot through a pulley shaft, and the pulley is always moved in the direction of the guide table by an elastic mechanism.

[0016] Further, the elastic mechanism comprises a push spring frame and a push spring sleeved outside the push spring frame, the connecting fork is clamped on the pulley shaft, a guide hole is arranged in the hinge arm, and the tail of the push spring frame is inserted into the guide hole and slides.

[0017] Further, one end of the push spring is pressed on the connecting fork, and the other end is pressed outside the guide hole.

[0018] The beneficial effects of the utility model are: 1. simple structure, low production cost, and improved market competitiveness.

[0019] 2. The utility model discloses two small springs are connected in first pull arm and second pull arm respectively, and the combined force of the elasticity of two springs pulls the trigger together, makes the door body swing to the closing direction all the time, compares single spring design, and the double spring design can provide greater reset elastic force while keeping the volume small, is especially suitable for the opening and closing operation of heavy box door or cabinet door, solves the problem that heavy door body resets difficultly due to the insufficient elastic force of traditional single spring.

[0020] 3. In single spring design, the reset tension is borne by a spring completely, and stress concentration leads to the problems of fatigue, deformation or fracture of the spring in long-time use. The utility model discloses that two springs share the stress, so that the load of each spring is reduced significantly, avoiding the situation of single-point excessive stress, and greatly improving the durability and service life of the spring.

[0021] 4. The design of two small springs also reduces the risk of overall hinge failure caused by single spring fatigue failure. Even if one spring has a problem, the other spring can still provide partial elastic force, thereby improving the stability and reliability of the overall hinge.

[0022] 5. In traditional single spring design, increasing the size of the spring is the main means to improve the reset ability, but this way will lead to a significant increase in the volume of the hinge, which is difficult to adapt to compact equipment or small box bodies. The utility model provides reset elastic force in the form of combined force by using two smaller springs, achieving higher elastic force output without increasing the overall volume of the hinge, optimizing the compactness and space utilization of the hinge, and being suitable for assembly requirements of various equipment.

[0023] 6. The double spring design uniformly stresses the two springs in the working process through reasonable layout and guide structure, effectively avoiding the problem of unstable reset tension caused by deformation or fatigue of single spring. In addition, the double spring layout of the utility model has a positive effect on the stability of door movement, ensuring force balance during the opening and closing process of the door, and reducing the possibility of vibration and shaking. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the general assembly drawing of the utility model.

[0025] Figure 2 It is one of the structure sectional views of the utility model.

[0026] Figure 3 , 4 It is the structure exploded view of the utility model.

[0027] Figure 5 It is the general assembly use effect drawing of the second tension spring and spring hanging plate in the utility model. DETAILED DESCRIPTION

[0028] The utility model makes further specific description below combining with the drawings. A kind of double-spring assisted box door hinge, it includes hinged arm 1, hinged arm 1 is internally provided with accommodating cavity 2, the one end of accommodating cavity 2 is hingedly installed with trigger 3, trigger 3 rotates around hinged point, realizes the opening and closing of hinge, first pull arm 4 is also installed in the accommodating cavity 2, one end of first pull arm 4 is hinged with trigger 3, and the other end is connected with hinged arm 1 by first tension spring 5;

[0029] First pull arm 4 is also connected with second pull arm 6, the other end of second pull arm 6 is connected with hinged arm 1 by second tension spring 7, and first tension spring 5 and second tension spring 7 always swing in closing direction by pulling trigger 3.

[0030] In one embodiment: the first guide slot 11 is provided on the hinged arm 1, one end of the first pull arm 4 is provided with the first sliding shaft 41, and the first sliding shaft 41 is slidingly installed in the first guide slot 11.

[0031] In one embodiment: the first spring pin 12 is further provided on the hinged arm 1, the second guide slot 61 is provided on the second pull arm 6 corresponding to the position of the first spring pin 12, the second guide slot 61 is sleeved outside the first spring pin 12, and one end of the first tension spring 5 is connected to the first spring pin 12.

[0032] In one embodiment: the second guide slot 61 is provided on the hinged arm 1, one end of the second pull arm 6 is provided with the second sliding shaft 62, and the second sliding shaft 62 is slidingly installed in the second guide slot 61.

[0033] In one embodiment: the second spring pin 13 is further provided on the hinged arm 1, and one end of the second tension spring 7 is connected to the second spring pin 13.

[0034] In one embodiment: the two ends of the first tension spring 5 and the second tension spring 7 are sleeved on the tension spring hanging plate 8, the hanging hook 81 and the mounting hole 82 are provided on the tension spring hanging plate 8.

[0035] In one embodiment: a plurality of spiral grooves 83 are provided on the end face of the tension spring hanging plate 8, and the first tension spring 5 or the second tension spring 7 is clamped in the spiral groove 83.

[0036] In one embodiment: the side wall of the trigger 3 protrudes towards the hinged arm 1 to provide a guide table 31; correspondingly, the third guide slot 14 is provided on the hinged arm 1, the pulley 15 is slidingly installed in the third guide slot 14 by the pulley shaft 16, and the pulley 15 is always moved towards the guide table 31 by the elastic mechanism.

[0037] In one embodiment, the elastic mechanism comprises a push spring frame 17 and a push spring 18 sleeved outside the push spring frame 17, the push spring frame 17 is provided with a connecting fork 19 clamped on the pulley shaft 16, the hinge arm 1 is provided with a guide hole 9, and the tail of the push spring frame 17 is inserted into the guide hole 9 and slides.

[0038] In one embodiment, one end of the push spring is pressed on the connecting fork 19, and the other end is pressed outside the guide hole 9.

[0039] Working principle

[0040] The main structure of the hinge comprises a hinge arm 1, a trigger 3, a first pull arm 4, a second pull arm 6, a first pull spring 5 and a second pull spring 7. When the box door is opened, the trigger 3 rotates around the hinge point in the accommodating cavity 2, and drives the first pull arm 4 and the second pull arm 6 to deviate. Two springs are stretched through respective connecting points, and reverse restoring forces are generated. Through the action of the resultant force, the trigger 3 is always pulled in the closing direction, so that the automatic resetting and assisted closing function of the box door is realized. This double-spring cooperation mode avoids the problem that the single spring cannot effectively reset the door body due to insufficient torque, and is especially suitable for heavy door bodies.

[0041] In the door body opening process, the two springs are stretched at the same time, and gradually accumulate energy.

[0042] When the door body is closed, the double springs release energy and provide a resultant force on the trigger 3, so that the box door resets smoothly. Through the division and cooperation of the two springs, the resetting capacity of the spring is greatly improved, and the problems of stress concentration and insufficient tension that easily occur when the traditional single spring is stretched and deformed are avoided.

[0043] Compared with the single spring design, the double spring structure of the utility model can more efficiently distribute mechanical load, not only improves the resetting elastic force, but also prolongs the service life of the spring and reduces the failure risk caused by single-point fatigue.

[0044] In addition, in the case, the first sliding shaft 41 is slidably connected to the hinge arm 1 through the first guide groove 11, so that the first pull arm 4 maintains a stable motion trajectory under the action of the pull spring, and the motion stability of the overall structure is enhanced.

[0045] Similarly, the second sliding shaft 62 is installed in the second guide slot 61, ensuring that the movement of the second pull arm 6 under the action of the pull spring is limited to a preset path, avoiding abnormal movement or wear caused by force deviation. The design of the double guide slot makes the force direction of the pull spring more accurate, avoiding the common problems of force deviation or unstable movement in single spring systems, improving the smoothness and reliability of the reset action.

[0046] Further, the first spring pin 12 and the second spring pin 13 are respectively used to fix the end portions of the first pull spring 5 and the second pull spring 7, and through reasonable pin shaft layout, the spring can maintain uniform stress during work, effectively reducing the risk of spring wear in long-term use.

[0047] More specifically, the pull spring hanging plate 8 is used to fix the installation position of the two pull springs, and the pull spring is clamped on the hanging plate through the spiral groove 83, and the stable fixation and quick installation of the pull spring are realized through the hook 81 and the mounting hole 82. This design greatly improves the installation and replacement efficiency of the spring. In addition, the spiral groove on the hanging plate in the case contacts the pull spring at multiple points, which can effectively disperse the force points and avoid the structural fatigue problem caused by single-point concentrated stress of the traditional hinge.

[0048] In summary, in the utility model, the double springs share the tension demand generated in the reset process through reasonable stress distribution. Compared with the single spring design, the double springs can significantly reduce the load pressure of a single spring, avoiding the influence of single-point concentrated stress on the durability of the spring. Even after long-term use, if a single spring appears certain fatigue deformation or functional attenuation, the other spring can still provide part of the elastic force, ensuring the normal work of the hinge. This design greatly prolongs the service life of the hinge, improves its application range and use reliability, and is especially suitable for heavy doors or high-frequency opening and closing scenes.

[0049] Therefore, it can be widely used.

[0050] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model can have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A double-spring assisted box door hinge, comprising a hinge arm (1), a containing cavity (2) is formed in the hinge arm (1), a trigger (3) is hingedly installed at one end of the containing cavity (2), the trigger (3) rotates around the hinge point to realize opening and closing of the hinge, characterized in that: The cavity (2) is also equipped with a first pull arm (4), one end of which is hinged to the trigger (3), and the other end is connected to the hinge arm (1) through a first tension spring (5); The first pull arm (4) is also connected to a second pull arm (6). The other end of the second pull arm (6) is connected to the hinge arm (1) through a second tension spring (7). The first tension spring (5) and the second tension spring (7) work together to pull the trigger (3) to swing in the closed direction.

2. A dual spring assisted box door hinge according to claim 1, wherein: The hinge arm (1) is provided with a first guide groove (11) that passes through its body. One end of the first pull arm (4) is provided with a first sliding shaft (41). The first sliding shaft (41) is slidably installed in the first guide groove (11). One end of the first tension spring (5) and the second pull arm (6) are connected to the first sliding shaft (41).

3. A dual spring assisted box door hinge according to claim 1, wherein: The hinge arm (1) is also provided with a first spring pin (12). Corresponding to the position of the first spring pin (12), the second pull arm (6) is provided with a second guide groove (61). The second guide groove (61) is fitted outside the first spring pin (12). One end of the first tension spring (5) is connected to the first spring pin (12).

4. A dual spring assisted box door hinge according to claim 1, wherein: The hinge arm (1) is provided with a second guide groove (61) that passes through its body. One end of the second pull arm (6) is provided with a second sliding shaft (62), which is slidably installed in the second guide groove (61). One end of the second tension spring (7) is connected to the second sliding shaft (62).

5. A dual spring assisted box door hinge according to claim 1, wherein: The hinge arm (1) is also provided with a second spring pin (13), and one end of the second tension spring (7) is connected to the second spring pin (13).

6. A dual spring assisted box door hinge according to claim 1, wherein: The first tension spring (5) and the second tension spring (7) are fitted onto the tension spring mounting plate (8), which is provided with hooks (81) and mounting holes (82).

7. A dual spring assisted box door hinge according to claim 6, wherein: The end face of the tension spring plate (8) is provided with several spiral grooves (83), and the first tension spring (5) or the second tension spring (7) is inserted into the spiral grooves (83).

8. A dual spring assisted box door hinge according to claim 1, wherein: The side wall of the trigger (3) is provided with a guide platform (31) protruding towards the hinge arm (1); correspondingly, a third guide groove (14) is provided on the hinge arm (1), and the pulley (15) is slidably installed in the third guide groove (14) through the pulley shaft (16). The pulley (15) is pushed by the elastic mechanism to always move towards the guide platform (31).

9. A dual spring assisted box door hinge according to claim 8, characterised in that: The elastic mechanism includes a push spring frame (17) and a push spring (18) fitted on it. A connecting fork (19) is provided on the push spring frame (17) and clamped on the pulley shaft (16). A guide hole (9) is provided in the hinge arm (1). The tail of the push spring frame (17) slides through the guide hole (9).

10. A dual spring assisted box door hinge according to claim 9, wherein: One end of the push spring is pressed against the connecting fork (19), and the other end is pressed against the outside of the guide hole (9).

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