Fire door with enhanced air tightness

Abstract

The application discloses a fireproof door with air tightness enhancement function, and relates to the technical field of building fire-fighting equipment. The fireproof door comprises a door frame, a door plate, an enhancement unit, a leakage prevention unit and a connecting buffer unit. The door frame is used for mounting the door plate. The door plate is used for opening and closing. The enhancement unit is used for enhancing the air tightness between the door plate and the door frame. The leakage prevention unit is used for avoiding the problem of insufficient sealing between the door frame and the door plate. The connecting buffer unit is used for connecting the door plate and the door frame. When a fire breaks out, the enhancement unit actively enhances the air tightness between the door frame and the door plate, avoids smoke leakage, and avoids the problem of the decrease of pressure caused by the fire, so that the problem of smoke leakage caused by the gap between the door frame and the door plate is avoided.

Description

Technical Field

[0001] This invention relates to the field of building fire protection equipment technology, specifically a fire door with enhanced airtightness. Background Technology

[0002] In modern building fire protection systems, fire doors, as key fire-resistant partitions, directly affect the safe evacuation of personnel and the control of fire spread. The core functional indicators of fire doors include fire resistance integrity and fire insulation, and the actual performance of these two indicators highly depends on the effective airtightness between the fire door and its frame under fire conditions. Ideally, a fire door should close completely in the event of a fire, forming a tight seal with the frame to prevent the spread of flames, high-temperature smoke, and toxic gases. However, in practical applications, especially in real fire scenarios, existing technologies have revealed several key defects affecting airtightness, mainly in the following aspects: Currently, the airtightness of most fire doors relies on the door closer pushing the door leaf to close, followed by a mechanical latch locking the door, and then passively tightening it through pre-installed sealing strips around the door leaf. The compression and contact pressure of the sealing strips mainly depend on the closing force of the door closer and the alignment between the door leaf and the door frame. Long-term use can lead to performance degradation of the door closer, or building settlement can cause slight misalignment between the door leaf and the door frame, both of which can reduce the actual sealing pressure, making it difficult to guarantee an effective seal in the early stages of a fire. Existing designs wait for the sealing strips to work after the door is closed, lacking the ability to actively and forcefully drive the sealing strips to fit tightly against the door frame after a fire signal is detected, in order to cope with initial deformation of the door leaf or door frame due to uneven heating.

[0003] During the development of a fire, factors such as thermal convection, deflagration, and changes in ventilation conditions can create complex dynamic pressure differences on both sides of a fire door (e.g., negative pressure suction due to the "chimney effect" or positive pressure due to combustion expansion). These pressure differences can have serious consequences. When the fire source is located on the side of the fire door facing away from closing, the positive pressure generated by combustion will resist the closing force of the door closer. Standard door closers are typically designed to overcome only the weight of the door leaf, normal wind pressure, and frictional resistance. Their closing torque is insufficient to cope with the instantaneous pressure differences of hundreds of Pascals or even higher that may occur during a fire. This can easily cause the door leaf to be "blocked" near the closed position, failing to lock completely and creating a fatal gap, allowing a closed door leaf to be accidentally pushed open. Even if the door leaf is initially closed, subsequent pressure fluctuations may overcome the retaining force of the latch, causing the door leaf to be accidentally pushed open and losing its isolation function. Existing locks are mostly designed for anti-theft and anti-pry purposes, and do not adequately consider the continuous or alternating aerodynamic loads during a fire. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to enhance the airtightness of fire doors, and to provide a fire door with an enhanced airtightness function.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: The fire door includes a door frame, a door panel is installed on the door frame, a connecting buffer unit is installed on the door frame, and an elastic telescopic block is installed on the door panel; The door frame is provided with several reinforcing units, and the door panel is provided with several reinforcing units. Each reinforcing unit includes a sealing component and a filling component. The sealing component, in conjunction with the filling component, changes its sealing performance according to the size of the fire. The sealing component is installed on the door panel, and the filling component is installed on the door frame. The door frame is provided with an anti-leakage unit, which includes an anti-leakage component. The anti-leakage component provides a rigid locking force to the door panel by sensing temperature. The anti-leakage component includes a sensing element and a locking element. The locking element is installed on the door frame and is provided with a sensing element. The door frame is connected to the door panel via a connecting buffer unit. Although existing technologies have sealing mechanisms, they cannot achieve active and powerful sealing during a fire. This invention actively enhances the sealing between the door frame and the door panel through an enhancement unit, increasing airtightness and preventing smoke leakage. At the same time, the anti-leakage unit detects the fire and prevents the door panel from losing its seal due to pressure differences caused by the fire, further improving airtightness.

[0006] Furthermore, the sealing assembly includes a memory spring and an expansion plate. One end of the memory spring is fixedly connected to the door panel, and the other end of the memory spring is fixedly connected to the expansion plate. The expansion plate is slidably connected to the door panel. In the prior art, the sealing structure is generally a sealing strip, lacking an active sealing structure to respond to fire conditions. This invention uses a memory spring to sense temperature and drive the expansion plate to actively seal.

[0007] Furthermore, the filling assembly includes a squeezing plate, a water outlet, a return spring, and a water storage chamber. The water storage chamber is located within the door frame. The squeezing plate is connected to the water storage chamber via the return spring. Multiple water outlets are provided on the squeezing plate, and a one-way valve is installed in each water outlet. The water storage chamber has a water inlet, and a one-way valve is installed in the water inlet. Existing technologies do not adjust the sealing strength according to the fire situation. This invention senses and receives temperature through the sealing assembly, controlling the filling degree of the sealing assembly to achieve a better sealing effect as the fire situation worsens.

[0008] Furthermore, the elastic telescopic block consists of a fixed end and a telescopic end. The telescopic end of the elastic telescopic block is a wedge-shaped block with a locking cylinder on it. The fixed end of the elastic telescopic block is connected to the connecting buffer unit. Existing technologies do not address situations where a fire causes the door panel and frame to become unstable, resulting in gaps that affect the airtightness of the fire door. This invention uses the locking cylinder of the wedge-shaped block in conjunction with the anti-leakage unit to prevent the door panel from being accidentally opened.

[0009] Furthermore, the locking component includes a lock box, an adjusting spring, a locking rod, and a push plate. The lock box is fixedly installed on the door frame, and a fixed wedge block is provided inside the lock box to cooperate with the wedge block at the telescopic end of the elastic telescopic block. The push plate is connected to the outer surface of the lock box through the adjusting spring. One end of the locking rod is fixedly connected to the push plate, and the other end of the locking rod is slidably connected to the lock box. Existing technologies do not have structures for actively locking door panels. This invention uses a locking component to actively lock the door, preventing the door panel from being accidentally opened and affecting the seal.

[0010] Furthermore, the sensing element includes a mounting bracket and a memory bimetallic strip. The mounting bracket is fixedly installed on the outer surface of the lock box. One end of the memory bimetallic strip is fixedly connected to the mounting bracket, and the other end of the memory bimetallic strip abuts against the surface of the push plate away from the lock box. The expansion coefficient of the metal sheet on the side of the memory bimetallic strip closer to the mounting bracket is greater than the expansion coefficient of the metal sheet on the side farther from the mounting bracket. Although there are components in the prior art that actively detect the occurrence of fire, they are generally electronically controlled components, which may be damaged and malfunction when the fire is large. This invention uses a sensing element to monitor fire while actively cooperating with the locking element to ensure the sealing state of the door panel.

[0011] Furthermore, the connecting buffer unit automatically and smoothly resets the door panel. The connecting buffer unit includes a connecting component and a buffer component. The door panel is connected to the door frame through the connecting component, and the buffer component is fixedly connected to the fixed end of the elastic telescopic block.

[0012] Furthermore, the buffer assembly includes a spiral spring and a fixing box. The fixing box is fixedly installed on the door frame, and a fixing post is provided inside the fixing box. One end of the spiral spring is fixedly connected to the fixing post, and the other end of the spiral spring is fixedly connected to the fixing end of the elastic telescopic block. In the prior art, the door cannot automatically and smoothly return to its original position after being accidentally opened, causing the fire door to fail to perform its sealing and fireproofing function in the event of a fire. This invention achieves automatic and smooth return of the door panel through a buffer assembly.

[0013] Furthermore, the connecting assembly includes a mounting base, a main arm, a secondary arm, and a connecting frame. The mounting base is fixedly mounted on the door panel. One end of the main arm is rotatably connected to the mounting base. The other end of the main arm is hinged to one end of the secondary arm. The other end of the secondary arm is hinged to the connecting frame. The connecting frame is fixedly mounted on the door frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes a memory spring that expands upon sensing temperature during a fire. This expansion spring, in turn, drives an expansion plate to push a compression plate along a water storage chamber. The increased pressure within the chamber causes water to flow out through a one-way valve at the outlet, wetting the expansion plate and causing it to expand further. This increases the airtightness between the door panel and frame, preventing smoke leakage. As the fire intensifies, the temperature sensed by the memory spring gradually increases, leading to a greater extension of the spring. This results in a longer distance the expansion plate pushes the compression plate, increasing the pressure within the water storage chamber and allowing more water to flow into the expansion plate, causing it to expand even further. This achieves the effect of increasing sealing between the door panel and frame as the fire intensifies and the temperature rises.

[0015] 2. In the event of a fire, the door panel remains closed. Because the elastic telescopic block and the fixed wedge are engaged, to prevent the door panel from failing to lock effectively due to increased pressure difference on both sides during a fire, thus preventing leakage, the memory bimetallic strip senses a temperature change and expands and bends. This pushes the push plate to compress the adjusting spring while simultaneously moving the locking rod downwards, inserting it into the lock cylinder of the elastic telescopic block. This further creates a rigid locking state, preventing subsequent pressure fluctuations from overcoming the holding force of the elastic telescopic block and the fixed wedge, thus preventing the door from being accidentally pushed open and losing its isolation function. This further ensures the airtightness of the door panel.

[0016] 3. This invention automatically and smoothly resets the door panel by using the restoring force of the spiral spring during the opening process, thus avoiding the situation where the fire door cannot be sealed and fireproof in the event of a fire if it is constantly open.

[0017] 4. This invention achieves fire detection, automatic locking, and enhanced sealing through a purely mechanical mechanism, avoiding the risk of leakage caused by the damage and unusability of traditional electronic control components during a fire. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a schematic diagram of the door panel appearance structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the door panel of the present invention; Figure 4 for Figure 3 A partial enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the internal structure of the door frame of the present invention; Figure 6 for Figure 5 A partial enlarged view of the structure at point B in the middle; Figure 7 for Figure 1 Another perspective structural diagram; Figure 8 for Figure 7 A partial enlarged view of the structure at point C; Figure 9 for Figure 7 A partial enlarged view of the structure at point D.

[0019] In the diagram: 1. Door frame; 2. Door panel; 3. Reinforcing unit; 31. Memory spring; 32. Expansion plate; 33. Extrusion plate; 34. Water outlet; 35. Return spring; 36. Water storage chamber; 4. Leakage prevention unit; 41. Lock box; 42. Adjusting spring; 43. Locking rod; 44. Push plate; 45. Mounting bracket; 46. Memory bimetallic strip; 5. Connecting buffer unit; 51. Spiral spring; 52. Fixing box; 53. Mounting base; 54. Main arm; 55. Secondary arm; 56. Connecting bracket. Detailed Implementation

[0020] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example: Figures 1-9 As shown, the present invention provides the following technical solution: like Figure 1 , Figure 2 , Figure 8 As shown, the fire door includes a door frame 1, a door panel 2 installed on the door frame 1, a connecting buffer unit 5 installed on the door frame 1, and an elastic telescopic block installed on the door panel 2. A number of reinforcing units 3 are provided inside the door frame 1 and a number of reinforcing units 3 are provided inside the door panel 2. The reinforcing unit 3 includes a sealing component and a filling component. The sealing component and the filling component change the sealing performance of the sealing component according to the size of the fire. The sealing component is installed on the door panel 2 and the filling component is installed on the door frame 1. A leak-proof unit 4 is provided on the door frame 1. The leak-proof unit 4 includes a leak-proof component. The leak-proof component provides a rigid locking force to the door panel 2 by sensing the temperature. The leak-proof component includes a sensing element and a locking element. The locking element is installed on the door frame 1 and the locking element is provided with a sensing element. The door frame 1 is connected to the door panel 2 via the connecting buffer unit 5.

[0022] like Figure 3 , Figure 4As shown, the sealing assembly includes a memory spring 31 and an expansion plate 32. One end of the memory spring 31 is fixedly connected to the door panel 2, and the other end of the memory spring 31 is fixedly connected to the expansion plate 32. The expansion plate 32 is slidably connected to the door panel 2.

[0023] like Figure 5 , Figure 6 As shown, the filling assembly includes a squeezing plate 33, a water outlet 34, a return spring 35, and a water storage chamber 36. The water storage chamber 36 is provided inside the door frame 1. The squeezing plate 33 is connected to the water storage chamber 36 through the return spring 35. Multiple water outlets 34 are provided on the squeezing plate 33. A one-way valve is provided inside the water outlet 34. The water storage chamber 36 is provided with a water inlet. A one-way valve is provided inside the water inlet.

[0024] In the event of a fire, the memory spring 31 senses the temperature and expands, causing the expansion plate 32 to push the compression plate 33 along the water storage chamber 36. At this time, the pressure in the water storage chamber 36 increases, causing the water in the water storage chamber 36 to flow out through the one-way valve in the outlet 34, wetting the expansion plate 32 and causing the expansion plate 32 to expand to a certain extent, increasing the airtightness between the door panel 2 and the door frame 1 and preventing smoke leakage. As the fire grows larger, the temperature sensed by the memory spring 31 gradually increases, and the elongation of the memory spring 31 gradually increases. This drives the expansion plate 32 to move a longer distance, the pressure in the water storage chamber 36 increases, and more water flows into the expansion plate 32, causing the expansion plate 32 to expand even more. This achieves the effect that the larger the fire and the higher the temperature, the stronger the sealing of the expansion plate 32 between the door panel 2 and the door frame 1.

[0025] like Figure 2 As shown, the elastic telescopic block consists of a fixed end and a telescopic end. The telescopic end of the elastic telescopic block is a wedge-shaped block with a locking cylinder on it. The fixed end of the elastic telescopic block is connected to the connecting buffer unit 5.

[0026] like Figure 7 , Figure 8 As shown, the locking component includes a lock box 41, an adjusting spring 42, a locking rod 43, and a push plate 44. The lock box 41 is fixedly installed on the door frame 1. A fixed wedge block that cooperates with the wedge block at the telescopic end of the elastic telescopic block is provided inside the lock box 41. The push plate 44 is connected to the outer surface of the lock box 41 through the adjusting spring 42. One end of the locking rod 43 is fixedly connected to the push plate 44, and the other end of the locking rod 43 is slidably connected to the lock box 41.

[0027] like Figure 8As shown, the sensing element includes a mounting bracket 45 and a memory bimetallic strip 46. The mounting bracket 45 is fixedly mounted on the outer surface of the lock box 41. One end of the memory bimetallic strip 46 is fixedly connected to the mounting bracket 45, and the other end of the memory bimetallic strip 46 abuts against the surface of the push plate 44 away from the lock box 41. The expansion coefficient of the metal strip on the side of the memory bimetallic strip 46 closer to the mounting bracket 45 is greater than the expansion coefficient of the metal strip on the side away from the mounting bracket 45.

[0028] In the event of a fire, door panel 2 remains closed. Since the elastic telescopic block and the fixed wedge are engaged, to prevent the door panel 2 from failing to effectively engage due to the increased pressure difference on both sides as the fire progresses, thus causing leakage, the memory bimetallic strip 46 senses the temperature change and expands and bends. This pushes the push plate 44 to compress the adjusting spring 42, while simultaneously moving the locking rod 43 downwards. The locking rod 43 then inserts into the lock cylinder of the elastic telescopic block, further forming a rigid locking state. This prevents subsequent pressure fluctuations from overcoming the holding force of the elastic telescopic block and the fixed wedge, thus preventing the door from being accidentally pushed open and losing its isolation function. This further ensures the airtightness of door panel 2.

[0029] like Figures 7-9 As shown, the connecting buffer unit 5 automatically and smoothly resets the door panel 2. The connecting buffer unit 5 includes a connecting component and a buffer component. The door panel 2 is connected to the door frame 1 through the connecting component, and the buffer component is fixedly connected to the fixed end of the elastic telescopic block.

[0030] like Figure 7 As shown, the buffer assembly includes a spiral spring 51 and a fixed box 52. The fixed box 52 is fixedly installed on the door frame 1. A fixed column is provided inside the fixed box 52. One end of the spiral spring 51 is fixedly connected to the fixed column, and the other end of the spiral spring 51 is fixedly connected to the fixed end of the elastic telescopic block.

[0031] During the opening of door panel 2, the self-restoring force of the spiral spring 51 pulls door panel 2 to automatically and smoothly return to its original position, thus preventing the fire door from being constantly open and thus failing to achieve sealing and fire prevention in the event of a fire.

[0032] like Figure 9 As shown, the connecting assembly includes a mounting base 53, a main arm 54, a secondary arm 55, and a connecting frame 56. The mounting base 53 is fixedly installed on the door panel 2. One end of the main arm 54 is rotatably connected to the mounting base 53, and the other end of the main arm 54 is hinged to one end of the secondary arm 55. The other end of the secondary arm 55 is hinged to the connecting frame 56, and the connecting frame 56 is fixedly installed on the door frame 1.

[0033] During the user's opening and closing of the door, the mounting base 53 on the door panel 2 drives the main arm 54 to rotate, thereby causing the auxiliary arm 55 to rotate around the connecting frame 56, ensuring that the opening and closing action of the door panel 2 is normal.

[0034] Working principle of the invention: In the event of a fire, the memory spring 31 senses the temperature and expands, causing the expansion plate 32 to push the compression plate 33 along the water storage chamber 36. At this time, the pressure in the water storage chamber 36 increases, causing the water in the water storage chamber 36 to flow out through the one-way valve in the outlet 34, wetting the expansion plate 32 and causing the expansion plate 32 to expand to a certain extent, increasing the airtightness between the door panel 2 and the door frame 1 and preventing smoke leakage. As the fire grows larger, the temperature sensed by the memory spring 31 gradually increases, and the elongation of the memory spring 31 gradually increases. This drives the expansion plate 32 to move a longer distance, the pressure in the water storage chamber 36 increases, and more water flows into the expansion plate 32, causing the expansion plate 32 to expand even more. This achieves the effect that the larger the fire and the higher the temperature, the stronger the sealing of the expansion plate 32 between the door panel 2 and the door frame 1.

[0035] In the event of a fire, door panel 2 remains closed. Since the elastic telescopic block and the fixed wedge are engaged, to prevent the door panel 2 from failing to effectively engage due to the increased pressure difference on both sides as the fire progresses, thus causing leakage, the memory bimetallic strip 46 senses the temperature change and expands and bends. This pushes the push plate 44 to compress the adjusting spring 42, while simultaneously moving the locking rod 43 downwards. The locking rod 43 then inserts into the lock cylinder of the elastic telescopic block, further forming a rigid locking state. This prevents subsequent pressure fluctuations from overcoming the holding force of the elastic telescopic block and the fixed wedge, thus preventing the door from being accidentally pushed open and losing its isolation function. This further ensures the airtightness of door panel 2.

[0036] During the opening of door panel 2, the self-restoring force of the spiral spring 51 pulls door panel 2 to automatically and smoothly return to its original position, thus preventing the fire door from being constantly open and thus failing to achieve sealing and fire prevention in the event of a fire.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fire door with enhanced airtightness, characterized in that: The fire door includes a door frame (1), a door panel (2) installed on the door frame (1), a connecting buffer unit (5) installed on the door frame (1), and an elastic telescopic block installed on the door panel (2). The door frame (1) is provided with a number of reinforcing units (3), and the door panel (2) is provided with a number of reinforcing units (3). The reinforcing unit (3) includes a sealing component and a filling component. The sealing component and the filling component change the sealing performance of the sealing component according to the size of the fire. The sealing component is installed on the door panel (2), and the filling component is installed on the door frame (1). The door frame (1) is provided with a leak prevention unit (4), the leak prevention unit (4) includes a leak prevention component, the leak prevention component provides a rigid locking force to the door panel (2) by sensing temperature, the leak prevention component includes a sensing element and a locking element, the locking element is installed on the door frame (1), and the locking element is provided with a sensing element; The door frame (1) is connected to the door panel (2) via a connecting buffer unit (5).

2. A fire door with enhanced airtightness according to claim 1, characterized in that: The sealing assembly includes a memory spring (31) and an expansion plate (32). One end of the memory spring (31) is fixedly connected to the door panel (2), and the other end of the memory spring (31) is fixedly connected to the expansion plate (32). The expansion plate (32) is slidably connected to the door panel (2).

3. A fire door with enhanced airtightness according to claim 1, characterized in that: The filling assembly includes a squeezing plate (33), a water outlet (34), a return spring (35), and a water storage chamber (36). The water storage chamber (36) is provided inside the door frame (1). The squeezing plate (33) is connected to the water storage chamber (36) through the return spring (35). The squeezing plate (33) is provided with multiple water outlets (34). A one-way valve is provided inside the water outlet (34). The water storage chamber (36) is provided with a water inlet. A one-way valve is provided inside the water inlet.

4. A fire door with enhanced airtightness according to claim 1, characterized in that: The elastic telescopic block consists of a fixed end and a telescopic end. The telescopic end of the elastic telescopic block is a wedge-shaped block with a locking cylinder on it. The fixed end of the elastic telescopic block is connected to the connecting buffer unit (5).

5. A fire door with enhanced airtightness according to claim 1, characterized in that: The locking components include a lock box (41), an adjusting spring (42), a locking rod (43), and a push plate (44). The lock box (41) is fixedly installed on the door frame (1). A fixed wedge block is provided inside the lock box (41) to cooperate with the wedge block at the telescopic end of the elastic telescopic block. The push plate (44) is connected to the outer surface of the lock box (41) through the adjusting spring (42). One end of the locking rod (43) is fixedly connected to the push plate (44), and the other end of the locking rod (43) is slidably connected to the lock box (41).

6. A fire door with enhanced airtightness according to claim 5, characterized in that: The sensing element includes a mounting bracket (45) and a memory bimetallic strip (46). The mounting bracket (45) is fixedly mounted on the outer surface of the lock box (41). One end of the memory bimetallic strip (46) is fixedly connected to the mounting bracket (45), and the other end of the memory bimetallic strip (46) abuts against the surface of the push plate (44) away from the lock box (41). The expansion coefficient of the metal sheet on the side of the memory bimetallic strip (46) closer to the mounting bracket (45) is greater than the expansion coefficient of the metal sheet on the side away from the mounting bracket (45).

7. A fire door with enhanced airtightness according to claim 4, characterized in that: The connecting buffer unit (5) automatically and smoothly resets the door panel (2). The connecting buffer unit (5) includes a connecting component and a buffer component. The door panel (2) is connected to the door frame (1) through the connecting component. The buffer component is fixedly connected to the fixed end of the elastic telescopic block.

8. A fire door with enhanced airtightness according to claim 7, characterized in that: The buffer assembly includes a spiral spring (51) and a fixed box (52). The fixed box (52) is fixedly installed on the door frame (1). A fixed column is provided inside the fixed box (52). One end of the spiral spring (51) is fixedly connected to the fixed column, and the other end of the spiral spring (51) is fixedly connected to the fixed end of the elastic telescopic block.

9. A fire door with enhanced airtightness according to claim 1, characterized in that: The connecting assembly includes a mounting base (53), a main arm (54), a secondary arm (55), and a connecting frame (56). The mounting base (53) is fixedly mounted on the door panel (2). One end of the main arm (54) is rotatably connected to the mounting base (53). The other end of the main arm (54) is hinged to one end of the secondary arm (55). The other end of the secondary arm (55) is hinged to the connecting frame (56). The connecting frame (56) is fixedly mounted on the door frame (1).

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