Door hinge with locking device

Abstract

This utility model discloses a hinge for a locking device for a flip door, including a first hinge piece and a second hinge piece. The first and second hinge pieces are rotatably connected by a pin. One end of the outer wall of the first hinge piece is provided with a locking component for limiting the rotation of the first and second hinge pieces. This utility model has a precise limiting structure in both the unlocked and locked states. For the locking state, the limiting structure can prevent the locking pin from loosening when the vehicle is bumpy, avoiding accidental opening of the flip door and causing equipment to fall or safety accidents. The limiting structure can still be used after unlocking, and the locking pin does not need to protrude externally, thus fundamentally avoiding a series of problems caused by exposed parts. It effectively avoids collisions between the protruding locking pin and operators or work equipment, reducing the risk of bumps and injuries caused by operators hitting protruding parts when picking up or putting down equipment. It can effectively ensure the stability of the flip door state and the reliability of operation under different needs.

Description

Technical Field

[0001] This utility model mainly relates to the field of special vehicle connector technology, specifically a door hinge with a locking device. Background Technology

[0002] Special-purpose vehicles are vehicles designed and manufactured to perform specific tasks or possess special functions, and their uses extend beyond those of ordinary passenger or freight vehicles. These vehicles are typically equipped with specialized equipment or devices according to operational needs, such as medical emergency facilities for ambulances, firefighting equipment for fire trucks, and repair tools for engineering rescue vehicles, to meet the special operational requirements in different scenarios.

[0003] One of the significant differences between special-purpose vehicles and ordinary cars is that they often have functional cargo doors. These doors are not merely for personnel entry and exit or cargo loading and unloading, but are closely related to the vehicle's specific functions. For example, the side doors of ambulances need to facilitate the quick entry and exit of stretchers, while the rear doors of engineering vehicles may need to accommodate the loading and unloading of heavy tools. The hinges used for these flip doors are mechanical components specifically designed to connect these functional flip doors of special-purpose vehicles to the vehicle body, enabling the flip doors to open and close flexibly and maintain their position. Existing flip door hinges for special-purpose vehicles often lack a dual-state precise limiting design. When locked, they rely solely on a simple locking pin or spring force, which can easily cause the locking pin to loosen due to vehicle bumps, leading to accidental opening of the door and causing safety accidents. When unlocked, they rely on exposed locking pins or positioning components to maintain the state, resulting in poor operational continuity and frequent collisions between protruding parts and operators or equipment, causing injuries, snagging on clothing, ropes, etc., interfering with operations, or even damage to the locking pin due to external pulling. It is difficult to balance the stability of the flip door in the flip state with operational safety. Utility Model Content

[0004] This utility model addresses the problem that existing technical solutions are too simplistic. It mainly provides a hinged door locking device to solve the technical problems mentioned in the background, such as the lock pin loosening due to bumps during locking, which can lead to safety accidents, and the reliance on exposed parts during unlocking which can cause bumps and snagging, making it difficult to balance door stability and operational safety.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: The locking device for a hinged door includes a first hinge piece and a second hinge piece, characterized in that: the first hinge piece and the second hinge piece are rotatably connected by a pin, a tensioning mechanism is provided between the first hinge piece and the second hinge piece, and a locking component for restricting the rotation of the first hinge piece and the second hinge piece is provided at one end of the outer wall of the first hinge piece.

[0006] The locking assembly has a locking pin movably connected inside its housing. An internal limiting member is welded to the outer wall of the locking pin. An internal positioning piece is provided below the locking pin. A compression spring is sleeved on the outer wall of the locking pin. A handle is provided at one end of the outer wall of the locking assembly housing. An external limiting plate is provided at one end of the handle.

[0007] Furthermore, the tensioning mechanism includes a spring, a first movable shaft, a second fixed shaft, and screws and nuts for fixing the first movable shaft. The second fixed shaft is disposed between the inner walls of the second hinge piece, and the first movable shaft is installed between the inner walls of the first hinge piece by screws and nuts. The opposite ends of the outer walls of the first movable shaft and the second fixed shaft are connected by a spring.

[0008] Furthermore, the housing of the locking assembly is welded to the first hinge piece, and through holes are respectively opened at both ends of the housing, and the locking pin slides horizontally along the through holes within the housing.

[0009] Furthermore, the handle is welded to the external limiting plate as a whole, and the axis of the external limiting plate is integrally connected to one end of the locking pin. The housing of the locking assembly has an annular external positioning groove on one side corresponding to the external limiting plate, which is used to cooperate with the external limiting plate. The external positioning groove restricts the displacement of the handle by interlocking with the external limiting plate.

[0010] Furthermore, one end of the compression spring is fixed to the inner wall of the locking assembly housing, and the other end abuts against one side of the internal limiting member. The locking pin forms an elastic reset structure through the compression spring. The second hinge piece has a slot at one end near the locking pin, and the shape of the slot is adapted to the locking pin.

[0011] Furthermore, the internal limiting member is cylindrical and symmetrically distributed at 180° about the axis of the locking pin, and a semi-circular groove is opened on the surface of the internal positioning piece below the locking pin to engage the internal limiting member.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. In the unlocked state, the hinge utilizes internal limiting components and internal positioning plates, while in the locked state, it utilizes external limiting plates and external positioning grooves. Both are combined with the elastic drive of the compression spring. When locked, the elastic force of the compression spring pushes the lock pin to reset, the internal limiting components return to a horizontal state, and at the same time, the external limiting plate accurately inserts into the external positioning groove, forming an axial rigid constraint. When unlocking, pulling the handle will simultaneously compress the compression spring and switch the internal limiting state. The operation is smooth and convenient, effectively ensuring the stability of the hinged door state and the reliability of operation under different needs.

[0013] 2. This hinge features precise limiting structures in both unlocked and locked states. This dual-state limiting structure allows the hinge to mechanically constrain the displacement of key components when the door is opened and closed, preventing accidental state switching due to external forces or vibrations. The limiting in the locked state prevents the locking pin from loosening during vehicle movement, thus avoiding accidental opening of the door and resulting in equipment falling or safety accidents. The limiting remains in the unlocked state, ensuring the locking pin does not protrude externally. This fundamentally avoids a series of problems caused by exposed components, effectively preventing collisions between the protruding locking pin and operators or equipment. It also reduces the risk of injury to operators from bumping into protruding components when retrieving or placing equipment. Furthermore, it prevents the exposed locking pin from snagging clothing, hoses, or ropes, ensuring smooth operation.

[0014] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the bottom structure of this utility model; Figure 2 This is a schematic diagram of the locking pin structure in the locked state of this utility model; Figure 3 This is a schematic diagram of the locking pin unlocking state structure of this utility model; Figure 4 This is a schematic diagram of the structure of the first hinge piece and the second hinge piece of this utility model; Figure 5 This is a schematic diagram of the assembly structure of this utility model.

[0016] Numbering on the map: 1. First hinge piece; 2. Second hinge piece; 3. Tensioning mechanism; 4. Locking assembly; 401. Locking pin; 402. Internal limiting component; 403. Internal positioning piece; 404. Compression spring; 405. Handle; 406. External limiting plate; 407. External positioning groove. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Please refer to the appendix carefully. Figure 1-5 The locking device includes a hinged door, comprising a first hinge piece 1 and a second hinge piece 2, which are rotatably connected by a pin. A tensioning mechanism 3 is provided between the first hinge piece 1 and the second hinge piece 2. A locking component 4 is provided at one end of the outer wall of the first hinge piece 1 to restrict the rotation of the first hinge piece 1 and the second hinge piece 2.

[0020] The locking assembly 4 has a locking pin 401 movably connected inside its housing. An internal limiting member 402 is welded to the outer wall of the locking pin 401. An internal positioning piece 403 is provided below the locking pin 401. A compression spring 404 is sleeved on the outer wall of the locking pin 401. A handle 405 is provided at one end of the outer wall of the locking assembly 4, and an external limiting plate 406 is provided at one end of the handle 405.

[0021] In this embodiment, as Figure 1 Figure 3 As shown, the tensioning mechanism 3 includes a spring, a first movable shaft, a second fixed shaft, and screws and nuts for fixing the first movable shaft. The second fixed shaft is disposed between the inner walls of the second hinge piece 2. The first movable shaft is installed between the inner walls of the first hinge piece 1 by screws and nuts. The opposite ends of the outer walls of the first movable shaft and the second fixed shaft are connected by a spring.

[0022] Through the above structure, the elastic potential energy of the spring is used to form a continuous and stable preload, which enhances the damping and return guidance of the second hinge plate 2 when it rotates. When the second hinge plate 2 drives the flip door to open, the spring adapts to the increase of the flip angle and stores energy. When the flip door needs to be closed, the spring releases its elastic potential energy to provide an auxiliary driving force for the return movement of the second hinge plate 2, making the flip reset smoother and easier. At the same time, it reduces the impact and shaking during the reset process, and improves the stability and accuracy of the flip door when it is closed. Furthermore, the installation of the first movable shaft can be adjusted according to another tensioning mechanism 3 and different installation positions to change the initial compression of the spring, accurately adapting to the flip doors of special vehicles of different weights. This avoids the opening and closing jamming caused by excessive tightness or the flip door shaking caused by excessive looseness. At the same time, corresponding inner and outer limit posts are set at the junction of the first hinge plate 1 and the second hinge plate 2, which can accurately limit the relative rotation range of the first hinge plate 1 and the second hinge plate 2, preventing the hinge components from being over-stressed and deformed due to excessive opening and closing angle, or from colliding with other structures of the vehicle body.

[0023] In this embodiment, as Figure 1 and Figure 3 As shown, the housing of the locking assembly 4 is welded to the first hinge piece 1 as a whole, and through holes are opened at both ends of the housing respectively, and the locking pin 401 slides horizontally along the through holes in the housing.

[0024] Through the above structure, the welded integral structure ensures that the shell and the first hinge piece 1 form a rigid connection, and there is no relative displacement when it moves synchronously with the door panel. This improves the overall structural strength of the locking assembly 4, and makes the sliding and locking action of the locking pin 401 smoother and more reliable, which is suitable for the high-frequency opening and closing of the flip door of special vehicles.

[0025] In this embodiment, as Figure 2 and Figure 3 As shown, the handle 405 is welded to the external limiting plate 406 as a whole, and the axis of the external limiting plate 406 is integrally connected to one end of the locking pin 401. The housing of the locking assembly 4 has an annular external positioning groove 407 on one side corresponding to the external limiting plate 406, which is used to cooperate with the external limiting plate 406. The external positioning groove 407 restricts the displacement of the handle 405 by interlocking with the external limiting plate 406.

[0026] Through the above structure, the integrated structure ensures the synchronous movement accuracy of the handle 405, the external limiting plate 406 and the locking pin 401. The interlocking structure of the annular external positioning groove 407 and the external limiting plate 406 can mechanically lock the position of the handle 405 in the locked state, thereby preventing the axial displacement of the locking pin 401 and effectively preventing the locking pin 401 from loosening due to vehicle vibration. At the same time, it provides the operator with clear feedback that the locking is in place, which not only enhances the overall rigidity of the locking structure, but also improves the reliability and safety of operation through the linkage of multiple components.

[0027] In this embodiment, as Figure 2 and Figure 3 As shown, one end of the compression spring 404 is fixed to the inner wall of the housing of the locking assembly 4, and the other end abuts against one side of the internal limiting member 402. The locking pin 401 forms an elastic reset structure through the compression spring 404. The second hinge piece 2 has a slot at one end near the locking pin 401, and the shape of the slot is adapted to the locking pin 401.

[0028] Through the above structure, the fixed support force is transmitted through the shell, so that the elastic potential energy of the compression spring 404 can be accurately applied to the internal limiting member 402 and the locking pin 401, ensuring the reliable elastic reset mechanism of the locking pin 401. At the same time, the method of fixing on one side and abutting on the other side avoids the compression spring 404 from shifting or falling off during repeated extension and contraction.

[0029] In this embodiment, as Figure 2 and Figure 3As shown, the internal limiting member 402 is cylindrical and symmetrically distributed at 180° about the axis of the locking pin 401, and the surface of the internal positioning piece 403 below the locking pin 401 has a semi-circular groove for engaging the internal limiting member 402.

[0030] Through the above structure, the 180° symmetrical layout and semi-circular slot structure can reliably limit the reset stroke of the locking pin 401 by rotating and switching the horizontal and vertical states of the internal limiting member 402. This ensures that the locking pin 401 stably disengages from the locking slot when unlocking and also avoids accidental reset.

[0031] The specific operating procedure for this utility model is as follows: When using this hinge, as shown in the attached... Figure 5 The partial installation diagram shown illustrates that the first hinge piece 1, serving as the fixed end, is bolted to the outward-facing side of the bottom of the special vehicle's cargo compartment. This position aligns with the conventional layout of functional cargo doors on special vehicles and represents a typical installation location for the fixed end of such door hinges. The second hinge piece 2, serving as the movable end, is bolted to the opening of the folding door on the cargo door surface and is fixed to the inward-facing side of the folding door (i.e., the side of the folding door facing the interior of the cargo compartment). When the second hinge piece 2 rotates vertically by 90 degrees with the folding door, its movement trajectory is not interfered with by the cargo compartment's bottom structure, allowing for smooth opening of the folding door.

[0032] When the hinge is locked, i.e. when the flip door needs to be opened, it needs to be pulled outward with the help of the external handle 405. At the same time as pulling, the handle 405 is rotated axially. At this time, the handle 405 will drive the locking pin 401 to disengage from the corresponding locking groove. During the horizontal movement of the locking pin 401, the internal limiting members 402 symmetrically distributed on its outer wall will also move synchronously, while the compression spring 404 is in a compressed state during this process.

[0033] As the operator rotates the handle 405 while pulling it, the internal limiting member 402 flips from its original horizontal symmetrical position to vertical symmetrical position. When the locking pin 401 completely disengages from the corresponding locking groove, the operator releases the force applied to the handle 405, the compression spring 404 stops compressing, and the locking pin 401 resets with the help of the elastic structure of the compression spring 404. However, within a small range of reset, due to the restriction of the internal positioning piece 403, the internal limiting member 402 is locked and fixed by the internal positioning piece 403, so that the door panel flips and opens vertically at 90° with the second hinge piece 2.

[0034] When the folding door needs to be locked, first flip the door panel to the closed position, then pull it outward with the external handle 405. While pulling, rotate the handle 405 axially in the opposite direction, and then release the force. At this time, the internal limiting member 402 will flip back from its original vertical symmetrical position to the horizontal symmetrical position. The locking pin 401 will then be reset under the elastic action of the compression spring 404 and re-inserted into the corresponding locking groove on the surface of the second hinge piece 2. This locking groove and the locking pin 401 are in clearance fit. The diameter of the groove is 0.1-0.2mm larger than the outer diameter of the locking pin 401, and the depth of the groove is 1.5 times the effective insertion length of the locking pin 401. The edge of the groove opening is chamfered at 30° to facilitate the smooth insertion of the locking pin 401 during the closing process of the folding door.

[0035] During the movement of the locking pin 401, the handle 405 will move synchronously with the external limiting plate 406, ultimately achieving the engagement of the external limiting plate 406 with the external positioning groove 407, thus completing the locking operation of the flip door.

[0036] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A hinge for a locking device, comprising a first hinge piece (1) and a second hinge piece (2), characterized in that: The first hinge piece (1) and the second hinge piece (2) are rotatably connected by a pin. A tensioning mechanism (3) is provided between the first hinge piece (1) and the second hinge piece (2). A locking component (4) for limiting the rotation of the first hinge piece (1) and the second hinge piece (2) is provided at one end of the outer wall of the first hinge piece (1). The locking assembly (4) has a locking pin (401) movably connected inside its housing. An internal limiting member (402) is welded to the outer wall of the locking pin (401). An internal positioning piece (403) is provided below the locking pin (401). A compression spring (404) is sleeved on the outer wall of the locking pin (401). A handle (405) is provided at one end of the outer wall of the housing of the locking assembly (4). An external limiting plate (406) is provided at one end of the handle (405).

2. The hinge of the locking device according to claim 1, characterized in that: The tensioning mechanism (3) includes a spring, a first movable shaft, a second fixed shaft, and screws and nuts for fixing the first movable shaft. The second fixed shaft is disposed between the inner walls of the second hinge piece (2). The first movable shaft is installed between the inner walls of the first hinge piece (1) by screws and nuts. The opposite ends of the outer walls of the first movable shaft and the second fixed shaft are connected by a spring.

3. The hinge of the locking device according to claim 1, characterized in that: The housing of the locking assembly (4) is welded to the first hinge piece (1) as a whole, and through holes are opened at both ends of the housing respectively. The locking pin (401) slides horizontally along the through holes in the housing.

4. The hinge of the door locking device according to claim 1, characterized in that: The handle (405) is welded to the external limiting plate (406) as a whole, and the axis of the external limiting plate (406) is integrally connected with one end of the locking pin (401). The housing of the locking assembly (4) has an annular external positioning groove (407) on one side corresponding to the external limiting plate (406) for use with the external limiting plate (406). The external positioning groove (407) restricts the displacement of the handle (405) by interlocking with the external limiting plate (406).

5. The hinge of the locking device according to claim 1, characterized in that: One end of the compression spring (404) is fixed to the inner wall of the housing of the locking assembly (4), and the other end abuts against one side of the internal limiting member (402). The locking pin (401) forms an elastic reset structure through the compression spring (404). The second hinge piece (2) has a slot at one end near the locking pin (401), and the shape of the slot is adapted to the locking pin (401).

6. The hinge of the locking device according to claim 1, characterized in that: The internal limiting member (402) is cylindrical and symmetrically distributed about the axis of the locking pin (401) at 180°. The surface of the internal positioning piece (403) below the locking pin (401) has a semi-circular groove for engaging the internal limiting member (402).

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