Single-spring self-locking door hinge of box door

Abstract

A single-spring self-locking door hinge of a box door comprises a main arm body installed on a box body, the main arm body is arranged in an open groove shape, a trigger is installed at one end of an open groove in a hinged mode through a hinged shaft, the trigger is connected with the box door, the trigger rotates around the hinged shaft to achieve opening and closing of the box door, a pull arm is further installed on the trigger in a hinged mode, and the pull arm is connected with the box door. A locking arm is hinged to the other end of the pull arm, the tail of the locking arm is connected with a tension spring fixed to the main arm body, and the tension spring generates tension to pull the trigger to move in the closing direction all the time through the locking arm and the pull arm. The main arm has the advantages that the front notch of the main arm body is provided with the connecting plate, the connecting plate is provided with the connecting hole, the fixing bolt is installed in the connecting hole, and the main arm body is connected with the box body. And the position of the connecting hole is close to a stress point between the trigger and the hinge point, so that the problems of deformation and damage of the main arm body caused by overlong supporting force arm of the main arm body are avoided, and the service life and the reliability of the door hinge are remarkably improved.

Description

Technical Field

[0001] The utility model relates to a hardware hinge, in particular to a single-spring self-locking door hinge for a box door. Background Art

[0002] As the connection and switch device between the box body and the door, the door hinge is widely used in various box structures. At present, the common door hinges on the market have several structural and functional deficiencies, which affect their use effect and life.

[0003] Existing door hinges usually adopt the following structure: one end of the main arm is fixed to the box body through a connecting piece, and the other end is connected to the trigger through a hinge shaft. This structural design has the following main problems:

[0004] 1. The stress point of the main arm is offset: In the prior art, the installation position between the main arm and the box often causes the stress point of the main arm to deviate from the hinge point of the main arm and the trigger. During the frequent opening and closing of the box door, the main arm is prone to deformation or even damage under stress due to the long support arm of the main arm. This design defect reduces the service life and reliability of the door hinge.

[0005] 2. Complex roller push structure: In order to ensure that the trigger can remain locked in the closed state, existing door hinges usually set a separate push spring on the roller to push the contact between the roller and the trigger. This design requires an additional push spring support structure to be set in the main arm body, which not only makes the door hinge structure more complicated, but also increases production costs and is difficult to manufacture and assemble.

[0006] 3. Insufficient connection and restriction of the side panels: The existing main arm body is usually composed of a bottom plate and left and right side panels, but there is a lack of effective connection and restriction between the left and right side panels. This design leads to poor bearing capacity and impact resistance of the main arm body. During use, when the main arm body is subjected to a large impact force, it is easy to cause the side panels to separate or deform, further affecting the overall strength and stability of the door hinge. Therefore, it is necessary to make further improvements. Utility Model Content

[0007] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a single-spring self-locking door hinge for a box door which is simple in structure, easy to use, effectively improves the bearing capacity and impact resistance of the main arm body, and ensures the long-term and stable use of the door hinge.

[0008] The utility model aims to achieve the following objectives: a single-spring self-locking door hinge for a box door, comprising a main arm body installed with a box body, the main arm body being arranged in an open slot shape, one end of the open slot being hingedly mounted with a trigger through a hinge shaft, the trigger being connected to the box door, the trigger rotating around the hinge shaft to realize the opening and closing of the box door, a pulling arm being hingedly mounted on the trigger, a locking arm being hingedly mounted on the other end of the pulling arm, the tail of the locking arm being connected with a tension spring fixed on the main arm body, the tension spring generating a pulling force through the locking arm and the pulling arm to pull the trigger to always move in the closing direction;

[0009] The pulling arm is also fixedly mounted with a sliding shaft, which is inserted into a guide groove in the main arm body and slides back and forth;

[0010] The locking arm is also rotatably mounted with a roller, which is arranged below the locking arm and always protrudes toward the trigger, so that the roller slides on the side wall of the trigger. The side wall of the trigger is provided with a concave locking groove. When the trigger is closed, the roller is inserted into the locking groove.

[0011] The front notch of the main arm body is provided with a connecting plate, the connecting plate is provided with a connecting hole, and a fixing bolt is installed in the connecting hole to connect the main arm body with the box body.

[0012] Furthermore: the main arm body includes a bottom plate and side plates arranged on both sides thereof, the side plates are vertically arranged between the bottom plate, the two side plates and the bottom plate form an open groove structure with an open upper end, and the trigger, pulling arm, locking arm and tension spring are installed in the open groove.

[0013] Furthermore: the connecting plate is made by bending the front end plate of the side plate, and the connecting plates on the two side plates are overlapped front and back.

[0014] Furthermore, the bottom plate, side plates and connecting plates are integrally bent from metal plates.

[0015] Furthermore: a hinge hole is arranged on the side plate, the hinge shaft is installed in the hinge hole, and a reinforcing rib is stamped and formed at a position corresponding to the side wall of the hinge hole.

[0016] The beneficial effects of the utility model are: 1. Simple structure, low production cost and improved market competitiveness.

[0017] 2. In the utility model, a connecting plate is provided at the front notch of the main arm body, and a connecting hole is provided on the connecting plate. A fixing bolt is installed in the connecting hole to connect the main arm body to the box body. The connecting hole is located close to the force point between the trigger and the hinge point, thereby avoiding the deformation and damage of the main arm body due to the excessively long supporting force arm, and significantly improving the service life and reliability of the door hinge.

[0018] 3. The utility model adopts a tension spring to replace the traditional push spring structure. The tension spring is directly connected to the locking arm and the main arm body. While the tension force is used to realize the automatic reset of the trigger, the locking arm drives the roller to realize the self-locking function of the trigger. This design does not require an additional push spring support structure in the main arm body, simplifies the overall structure of the door hinge, reduces production costs, and is more convenient to manufacture and assemble.

[0019] 4. The utility model sets a roller on the locking arm, and the roller is always in sliding contact with the side wall of the trigger through the protruding design, and when the trigger is closed, the roller is stuck in the locking groove of the side wall of the trigger to ensure the reliable locking of the trigger. This design improves the locking stability of the door hinge and avoids the problem of accidental opening of the door hinge due to loose locking after closing.

[0020] 5. The utility model provides a connecting plate at the front notch of the main arm body, which connects and fixes the left and right side panels together, thereby effectively enhancing the overall strength and stability of the main arm body, improving the bearing capacity and impact resistance of the door hinge, and avoiding the problem of separation or deformation of the side panels during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 , 2 This is the general assembly effect diagram of the utility model structure.

[0022] Figure 3 It is a cross-sectional view of the structure of the utility model.

[0023] Figure 4 This is a structural exploded view of the utility model.

[0024] Figure 5 It is a schematic diagram of the main arm structure in the utility model.

[0025] Figure 6 This is a schematic diagram of the trigger in the utility model being in an open state.

[0026] Explanation of the reference numerals: 1 - main arm body; 11 - guide groove; 12 - connecting plate; 13 - connecting hole; 14 - bottom plate; 15 - side plate; 16 - hinge hole; 17 - reinforcing rib; 2 - hinge shaft; 3 - trigger; 31 - locking groove; 4 - pulling arm; 41 - sliding shaft; 5 - locking arm; 51 - roller; 6 - tension spring. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below with reference to the accompanying drawings. A single-spring self-locking door hinge for a box door, comprising a main arm body 1 mounted on a box body, the main arm body 1 being arranged in an open slot shape, one end of the open slot being hingedly mounted with a trigger 3 through a hinge shaft 2, the trigger 3 being connected to the box door, the trigger 3 rotating around the hinge shaft 2 to realize the opening and closing of the box door, a pulling arm 4 being hingedly mounted on the trigger 3, a locking arm 5 being hingedly mounted on the other end of the pulling arm 4, the tail of the locking arm 5 being connected to a tension spring 6 fixed on the main arm body 1, the tension spring 6 generating a pulling force to pull the trigger 3 through the locking arm 5 and the pulling arm 4 to always move in the closing direction;

[0028] The pulling arm 4 is also fixedly mounted with a sliding shaft 41, which is inserted into the guide groove 11 in the main arm body 1 and slides back and forth;

[0029] The locking arm 5 is also rotatably mounted with a roller 51, which is arranged below the locking arm 5 and always protrudes toward the trigger 3, so that the roller 51 slides on the side wall of the trigger 3. The side wall of the trigger 3 is provided with a concave locking groove 31. When the trigger 3 is closed, the roller 51 is inserted into the locking groove 31.

[0030] The front notch of the main arm body 1 is provided with a connecting plate 12, and the connecting plate 12 is provided with a connecting hole 13, and a fixing bolt is installed in the connecting hole 13 to connect the main arm body 1 with the box body.

[0031] In one embodiment: the main arm body 1 includes a bottom plate 14 and side plates 15 arranged on both sides thereof, the side plates 15 and the bottom plate 14 are vertically arranged, and the two side plates 15 and the bottom plate 14 form an open groove structure with an open upper end, and the trigger 3, pulling arm 4, locking arm 5 and tension spring 6 are installed in the open groove.

[0032] In one embodiment, the connecting plate 12 is made by bending the front end plate of the side plate 15 , and the connecting plates 12 on the two side plates 15 overlap each other front to back.

[0033] In one embodiment, the bottom plate 14, the side plate 15 and the connecting plate 12 are integrally bent from metal plates.

[0034] In one of the embodiments: a hinge hole 16 is provided on the side plate 15 , the hinge shaft 2 is installed in the hinge hole 16 , and a reinforcing rib 17 is stamped and formed at a position corresponding to the side wall of the hinge hole 16 .

[0035] Working principle: The main arm body 1 in this case is an open groove structure, which is composed of a bottom plate 14 and two side plates 15. The main arm body is connected to the box body through the connecting plate 12 of its front notch. The connecting plate 12 is provided with a connecting hole 13, which is installed on the box body through a fixing bolt, so that the main arm body is firmly fixed on the box body. Among them, the position of the connecting hole 13 is located in the middle of the connecting plate, so that the fixing bolt can avoid the position of the trigger, thereby avoiding the overlapping and interference of the trigger movement trajectory. The connecting plate 12 is formed by bending the front end plate of the side plate 15, and overlapping and lapped front and back, so that the left and right side plates are connected as a whole through the connecting plate, thereby enhancing the structural strength of the main arm body.

[0036] Further: Figure 6 As shown, the connecting plate 12 provided also serves to limit the maximum opening angle of the trigger, so that the gravity of the door can be borne on the connecting plate through the trigger, so that the connecting plate plays the role of bearing the weight of the door, avoiding the need to use the limit of the pull arm to bear the load in the traditional technology, which has the disadvantages of insufficient bearing capacity and easy damage to the door hinge.

[0037] Furthermore, the trigger 3 is hingedly mounted on one end of the main arm body 1 through the hinge shaft 2 and connected to the box door. The trigger 3 rotates around the hinge shaft 2 to open and close the box door. By reasonably arranging the distance between the hinge point and the connecting hole, the weight of the box door is transmitted to the connecting hole with the shortest force arm after passing through the hinge point, and finally transmitted to the box body.

[0038] Among them, a pulling arm 4 is hingedly mounted on the trigger 3, and a locking arm 5 is hingedly mounted on the other end of the pulling arm 4. The tail of the locking arm 5 is connected to the pulling spring fixed on the main arm body 1 through a tension spring 6. The tension spring 6 generates a pulling force, which acts on the trigger 3 through the locking arm 5 and the pulling arm 4, so that the trigger always moves in the closing direction, thereby providing an automatic closing force for the box door.

[0039] Among them, a roller 51 is rotatably mounted on the locking arm 5, and the roller 51 protrudes from the bottom of the locking arm 5 and always protrudes toward the trigger 3, so that the roller 51 slides on the side wall of the trigger 3. A concave locking groove 31 is provided on the side wall of the trigger 3. When the trigger 3 is closed, the roller 51 is inserted into the locking groove 31 to ensure that the trigger is reliably locked and prevent the door hinge from accidentally opening after closing.

[0040] Among them, the bottom plate 14, the side plate 15 and the connecting plate 12 of the main arm body are all formed by bending metal plates in one piece, and each part is tightly connected to form an integral structure. This one-piece molding design not only improves the structural strength and durability of the main arm body, but also simplifies the production process and reduces the production cost. At the same time, the reinforcing ribs 17 on the main arm body are set at the position of the hinge hole 16 of the side plate 15 by stamping, which further enhances the bearing capacity and impact resistance of the main arm body, and ensures the stability and durability of the door hinge in a high-intensity and high-frequency use environment.

[0041] Through the above structure and, the single-spring self-locking door hinge of the box door of the utility model can effectively solve the problems of uneven force on the main arm body and easy deformation and damage in the prior art during use. Furthermore, in this case, a tension spring is used to replace the traditional push spring structure. The tension spring is directly connected to the locking arm and the main arm body. While the trigger is automatically reset by pulling the tension, the roller is driven to swing by the locking arm, thereby realizing the self-locking function of the trigger. This design does not require an additional push spring support structure to be set in the main arm body, simplifies the overall structure of the door hinge, reduces production costs, and makes its manufacture and assembly more convenient, so it can be widely promoted and used.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the scope of protection of the claims created by the utility model.

Claims

1. A single-spring self-locking door hinge for a box door, comprising a main arm body (1) mounted on a box body, the main arm body (1) being arranged in an open slot shape, one end of the open slot being hingedly mounted with a trigger (3) through a hinge shaft (2), the trigger (3) being connected to the box door, the trigger (3) rotating around the hinge shaft (2) to realize the opening and closing of the box door, characterized in that: The trigger (3) is also hingedly mounted with a pulling arm (4), and the other end of the pulling arm (4) is hingedly mounted with a locking arm (5), and the tail of the locking arm (5) is connected to a tension spring (6) fixed on the main arm body (1), and the tension spring (6) generates a pulling force to pull the trigger (3) through the locking arm (5) and the pulling arm (4), so that the trigger (3) always moves in the closing direction; The pulling arm (4) is also fixedly mounted with a sliding shaft (41), and the sliding shaft (41) is inserted into a guide groove (11) located in the main arm body (1) and slides back and forth; A roller (51) is rotatably mounted on the locking arm (5). The roller (51) is arranged below the locking arm (5) and always protrudes in the direction of the trigger (3), so that the roller (51) slides on the side wall of the trigger (3). The side wall of the trigger (3) is provided with a concave locking groove (31). When the trigger (3) is closed, the roller (51) is inserted into the locking groove (31). The front notch of the main arm body (1) is provided with a connecting plate (12), and the connecting plate (12) is provided with a connecting hole (13). A fixing bolt is installed in the connecting hole (13) to connect the main arm body (1) to the box body.

2. The single-spring self-locking door hinge for a door according to claim 1, characterized in that: The main arm body (1) comprises a bottom plate (14) and side plates (15) arranged on both sides thereof, the side plates (15) and the bottom plate (14) are arranged vertically, and the two side plates (15) and the bottom plate (14) form an open groove structure with an open upper end, and the trigger (3), the pulling arm (4), the locking arm (5) and the tension spring (6) are installed in the open groove.

3. The single spring self-locking door hinge for a door according to claim 2, characterized in that: The connecting plate (12) is made by bending the front end plate of the side plate (15), and the connecting plates (12) on the two side plates (15) are overlapped front and back.

4. The single-spring self-locking door hinge for a door according to claim 3, characterized in that: The bottom plate (14), the side plate (15) and the connecting plate (12) are integrally formed by bending a metal plate.

5. The single spring self-locking door hinge for a door according to claim 2, characterized in that: The side plate (15) is provided with a hinge hole (16), the hinge shaft (2) is installed in the hinge hole (16), and a reinforcing rib (17) is stamped and formed at a position corresponding to the side wall of the hinge hole (16).

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