Escape lock two-way opening structure and escape door using the structure

By using a two-way opening structure for the escape lock, the problem of the existing one-way opening of the escape door is solved, realizing the two-way opening and closing of the escape door and improving the utilization rate of the building's interior area.

CN122129164APending Publication Date: 2026-06-02JIANGSU MINGWEI INTELLIGENT LOCK IND CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU MINGWEI INTELLIGENT LOCK IND CO LTD
Filing Date
2026-04-24
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing escape doors can only be opened in one direction, which cannot meet the need to increase the utilization rate of the building's interior space.

Method used

The escape door adopts a two-way opening structure, including a lock body assembly, a linkage assembly, a lock base assembly, and a sealing assembly. By manually unlocking the lock body assembly, the lock base assembly and the sealing assembly are unlocked, enabling the escape door to open in both directions. The two-way locking is achieved through the cooperation of the side guide surface and the sealing pin.

Benefits of technology

It enables the escape doors to open and close in both directions, improving the utilization rate of the building's interior space.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

This application relates to the field of escape locks, and more particularly to a two-way opening structure for an escape lock and an escape door using this structure. A two-way opening structure for an escape lock includes a lock body assembly, a linkage assembly, a lock seat assembly, and a sealing assembly. The lock body assembly is used to apply force to control unlocking. The linkage assembly is used to synchronously drive the lock seat assembly when the lock body assembly moves. The lock seat assembly and the sealing assembly are used to cooperate in locking / unlocking the escape door. The lock seat assembly / sealing assembly includes a sealing hole and side guide surfaces located on both sides of the sealing hole. The sealing assembly / lock seat assembly includes a sealing pin that can be inserted into the sealing hole by cooperating with either side guide surface. When the door is closed, the door is reset. Because the lock seat assembly / sealing assembly has side guide surfaces, the sealing pin retracts along the side guide surfaces when it is in contact with them, and is inserted when the sealing pin is directly opposite the sealing hole, completing the locking action. Therefore, two-way opening is achieved.
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Description

Technical Field

[0001] This application relates to the field of escape locks, and more particularly to a two-way opening structure for an escape lock and an escape door using the structure. Background Technology

[0002] With the development of the times, especially the large-scale construction of modern buildings and factories, the phenomenon of overlapping "shared passages" in different areas of buildings has gradually emerged due to the requirement to improve the efficiency of space utilization. In other words, in order to improve the efficiency of building space utilization, everyone has unwittingly "occupied" each other's escape passage space, which has indirectly led to one family's exit escape passage becoming another family's entrance passage.

[0003] Existing escape doors can only be opened in one direction. In order to meet the need to improve the utilization rate of the building's interior space, the applicant has developed an escape door that can be opened in both directions. Summary of the Invention

[0004] In order to meet the need to improve the utilization rate of the interior area of ​​buildings and enable the escape door to open in both directions, this application provides an escape lock two-way opening door structure and an escape door using the structure.

[0005] Firstly, this application provides a two-way opening structure for an escape lock, which adopts the following technical solution: An escape lock with a two-way opening structure includes a lock body assembly, a linkage assembly, a lock base assembly, and a sealing assembly; The lock body assembly is used to apply force to control unlocking; The linkage component is used to synchronously drive the lock seat component when the lock body component moves; The lock seat assembly and sealing assembly are used to cooperate in locking / unlocking the escape door. The lock seat assembly / sealing assembly includes a sealing hole and side guide surfaces located on both sides of the sealing hole. The sealing assembly / lock seat assembly includes a sealing pin that can be inserted into the sealing hole by cooperating with either side guide surface.

[0006] By adopting the above technical solution, when the door needs to be opened, the lock body assembly is manually unlocked. The lock body assembly, through the linkage assembly, drives the lock seat assembly and the sealing assembly to complete the unlocking action. At this time, the lock seat assembly and the sealing assembly no longer play a restrictive role, and the escape door can be opened to either side. When the door needs to be closed, the door is driven to reset. Because the lock seat assembly / sealing assembly is provided with a side guide surface, the sealing pin will retract along the side guide surface when it is in contact with the side guide surface, and will be inserted when the sealing pin is aligned with the sealing hole to complete the locking action. Therefore, it can achieve two-way opening.

[0007] Preferably, the lock seat assembly includes an upper lock seat assembly and a lower lock seat assembly, and the sealing assembly includes an upper sealing assembly and a lower sealing assembly. The upper lock seat assembly and the upper sealing assembly are used to cooperate in locking / unlocking the upper side of the escape door; the lower lock seat assembly and the lower sealing assembly are used to cooperate in locking / unlocking the lower side of the escape door.

[0008] Preferably, the sealing assembly includes an upper sealing base for installation within the frame of the escape door. The upper end face of the upper sealing base is formed with an upper sealing groove, and the bottom of the upper sealing groove is formed with an upper sealing through hole smaller than the upper sealing groove. The sealing pin includes an upper sealing roller seat and an upper sealing limiting roller rotatably connected to the lower end of the upper sealing roller seat. The size of the upper sealing roller seat is larger than the size of the upper sealing through hole but smaller than the size of the upper sealing roller seat. The lower end of the upper sealing limiting roller extends out of the upper sealing base. An upper sealing inner spring is provided inside the upper sealing base to apply downward pressure to the upper sealing roller seat.

[0009] By adopting the above technical solution, when the door panel needs to be closed, it is only necessary to push the door panel to reset. The upper sealing limit roller on the upper sealing roller seat will move along the upper sealing guide plate to the position directly opposite the sealing hole. Under the action of the upper sealing spring, the upper sealing roller seat will spring into the sealing hole to complete the upper limit of the door panel.

[0010] Preferably, an upper sealing cover plate is installed near the upper end of the upper sealing groove, and the upper sealing spring is disposed in the upper sealing groove between the upper sealing cover plate and the upper sealing roller seat.

[0011] By adopting the above technical solution, the upper sealing cover plate is used as the upper limit position of the spring inside the upper sealing opening.

[0012] Preferably, the locking seat assembly includes a locking seat base, an upper sealing guide plate connected to the upper end of the locking seat base, and a locking seat mounting plate installed on the side of the locking seat base. The locking seat base includes a locking seat bottom plate and locking seat side plates located on both sides of the locking seat bottom plate at a 90-degree angle to the locking seat bottom plate. The locking seat mounting plate is located at the lateral opening of the locking seat base and is connected and fixed to the two locking seat side plates.

[0013] Preferably, the included angle between the side guide surfaces formed by bending the two sides of the upper sealing guide plate is 20-70 degrees.

[0014] Preferably, the upper sliding member is provided inside the upper locking seat base. The upper sliding member abuts against the upper locking seat base plate and the upper locking seat side plate, so that the upper sliding member can slide along the upper locking seat base in the vertical direction. The upper end of the upper sliding member is fixed with the upper locking seat push block, and the position of the upper locking seat push block is directly opposite the position of the sealing hole. The lower end of the upper sliding member is connected to the upper connecting screw tube by a pin. The lower end of the upper connecting screw tube is threadedly connected to the upper rod. The lower end of the upper rod is connected to the linkage component.

[0015] By adopting the above technical solution, the upper connecting screw tube can be adjusted to fit different sizes in cooperation with the upper rod, and the connection between the upper rod and the linkage component enables stable operation during use.

[0016] Preferably, the lower lock seat assembly includes a lower lock seat base, a lower lock seat mounting plate, a lower square pin that moves up and down between the lower lock seat base and the lower lock seat mounting plate, a pin linkage connected to the lower square pin, a lower connecting screw connected to the pin linkage, and a lower rod that is threaded into the lower connecting screw.

[0017] By adopting the above technical solution, the lower connecting screw and the lower rod can be adjusted to fit different sizes.

[0018] Secondly, this application provides an escape door, which adopts the following technical solution: An escape door includes a door frame, a door panel, and a two-way opening structure for an escape lock as described in any one of claims. The door frame and door panel are hinged on one side. The lock seat assembly includes an upper lock seat assembly and a lower lock seat assembly. The sealing assembly includes an upper sealing assembly and a lower sealing assembly. The lock body assembly is installed on the front of the door panel. The upper lock seat assembly, the lower lock seat assembly, and the linkage assembly are installed inside / on top of the door panel. The upper sealing assembly is installed on the inner side of the upper end of the door frame, directly opposite the upper lock seat assembly. The lower sealing assembly is installed on the inner side of the lower end of the door frame, directly opposite the lower lock seat assembly.

[0019] By adopting the above technical solutions, the escape doors can be opened / closed in both directions, improving the utilization rate of the building's interior space.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. When the door needs to be opened, manually unlock the lock body assembly. The lock body assembly, through the linkage assembly, drives the lock seat assembly and sealing assembly to complete the unlocking action. At this time, the lock seat assembly and sealing assembly no longer play a restrictive role, and the escape door can be opened to either side. When the door needs to be closed, drive the door panel to reset. Because the lock seat assembly / sealing assembly has a side guide surface, the sealing pin will retract along the side guide surface when it is in contact with the side guide surface, and will be inserted when the sealing pin is aligned with the sealing hole to complete the locking action. Therefore, it can achieve two-way opening. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of Embodiment 1; Figure 2 This is an exploded view of the lock body assembly in Embodiment 1; Figure 3 This is a cross-sectional schematic diagram of the upper sealing component in Embodiment 1; Figure 4 This is an exploded view of the upper sealing assembly in Embodiment 1; Figure 5 This is an exploded view of the upper locking seat assembly in Embodiment 1; Figure 6 This is a schematic diagram of the lower sealing component in Embodiment 1; Figure 7 This is an exploded view of the lower locking seat assembly in Embodiment 1; Figure 8 This is a schematic diagram of the structure of Embodiment 2.

[0022] Explanation of reference numerals in the attached drawings: 1. Lock body assembly; 2. Upper lock seat assembly; 3. Lower lock seat assembly; 4. Upper sealing assembly; 5. Lower sealing assembly; 6. Linkage assembly; 7. Main lock seat; 8. Secondary lock seat; 9. Escape lock pressure rod; 10. Lock body base; 11. Handle pivot seat; 12. Lock shell; 13. Downward-pressing handle; 14. Handle return spring; 15. Lock body base plate; 16. Lock body frame plate; 17. Frame plate through hole; 18. Upper lever; 19. Upper lever plate; 20. Upper lever force rod; 21. Transmission rod; 22. Upper sealing base; 23. Upper sealing groove; 24. Upper sealing through hole; 25. Upper sealing roller seat; 26. Upper sealing limit roller; 27. Upper sealing cover plate; 28. Upper sealing... 29. Inner spring; 30. Upper lock seat base; 31. Upper sealing guide plate; 32. Upper lock seat mounting plate; 33. Upper lock seat bottom plate; 34. Side guide surface; 35. Sealing through hole; 36. Upper sliding component; 37. Upper lock seat push block; 38. Upper connecting screw tube; 39. Upper rod; 40. Lower sealing plate; 41. Lower sealing through hole; 42. Lower lock seat base; 43. Lower lock seat mounting plate; 44. Lower square pin; 45. Pin linkage component; 46. Lower connecting screw tube; 47. Lower rod; 48. First linkage plate; 49. Second linkage plate; 50. Linkage pin; 51. Linkage hole; 52. Upper annular groove; 53. Lower annular groove; 54. Door frame; 55. Door panel. Detailed Implementation

[0023] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0024] This application discloses a two-way opening structure for an escape lock and an escape door using the structure. The terms "up", "down", "left", and "right" used in the embodiments are schematic representations of relative directions and are not limitations on the positional relationship.

[0025] Example 1: like Figure 1 As shown, the escape lock's two-way opening structure includes a lock body assembly 1, an upper lock seat assembly 2, a lower lock seat assembly 3, an upper sealing assembly 4, a lower sealing assembly 5, and a linkage assembly 6 connecting the lock body assembly 1 with the upper lock seat assembly 2 and the lower lock seat assembly 3.

[0026] like Figure 2 As shown, the lock body assembly 1 includes a main lock seat 7, a secondary lock seat 8, and an escape locking lever 9 connecting the main lock seat 7 and the secondary lock seat 8. Both the main lock seat 7 and the secondary lock seat 8 include a lock body base 10, a handle pivot seat 11 mounted on the lock body base 10, a lock housing 12, a push-down handle 13 connected to the handle pivot seat 11, and a handle return spring 14 mounted on the push-down handle 13. One end of the push-down handle 13, extending out of the lock housing 12, is connected to the escape locking lever 9. The lock body base 10 includes a lock body bottom plate 15 and a U-shaped lock body frame plate 16 connected to the lock body bottom plate 15. A frame plate through hole 17 is formed on the side of the lock body frame plate 16 away from the lock body bottom plate 15, and one end of the push-down handle 13 passes through the frame plate through hole 17. An upper lever 18, capable of moving vertically, is provided between the lock body base plate 15 and the lock body frame plate 16. The upper lever 18 includes two upper lever plates 19 and an upper lever force rod 20 connecting the two upper lever plates 19. The distance between the two upper lever plates 19 is equal to the width of one end of the downward-pressing handle 13 that penetrates into the through hole 17 of the frame plate, and the end of the downward-pressing handle 13 that penetrates into the through hole 17 of the frame plate abuts against the lower side of the upper lever force rod 20. A transmission rod 21 is fixedly connected to the upper lever 18, and the transmission rod 21 passes through the lock body base plate 15 and cooperates with the linkage assembly 6. By pressing down the escape lock lever 9, the downward-pressing handle 13 is rotated, which drives the upper lever 18 to move upward, thus performing the unlocking action.

[0027] like Figure 3 and Figure 4 As shown, the upper sealing assembly 4 includes an upper sealing base 22 for installation within the door frame 54 of the escape door. A square upper sealing groove 23 is formed on the upper end face of the upper sealing base 22, and an upper sealing through hole 24, smaller than the upper sealing groove 23, is formed at the bottom of the upper sealing groove 23. An upper sealing roller seat 25 is provided within the upper sealing groove 23, and the size of the upper sealing roller seat 25 is larger than the size of the upper sealing through hole 24 but smaller than the size of the upper sealing roller seat 25, ensuring that the upper sealing roller seat 25 does not pass through the upper sealing through hole 24. An upper sealing limiting roller 26 is rotatably mounted on the lower side of the upper sealing roller seat 25, and the lower end of the upper sealing limiting roller 26 extends out of the upper sealing base 22. An upper sealing cover plate 27 is installed near the upper end of the upper sealing groove 23, and an upper sealing inner spring 28 is provided in the upper sealing groove 23 between the upper sealing cover plate 27 and the upper sealing roller seat 25 to apply downward pressure to the upper sealing roller seat 25. The upper sealing roller seat 25 and the upper sealing limiting roller 26 are combined to form a sealing pin.

[0028] like Figure 5As shown, the locking seat assembly 2 includes a locking seat base 29, an upper sealing guide plate 30 connected to the upper end of the locking seat base 29, and a locking seat mounting plate 31 installed on the side of the locking seat base 29. The locking seat base 29 includes a locking seat bottom plate 32 and locking seat side plates 33 located on both sides of the locking seat bottom plate 32 at a 90-degree angle to the locking seat bottom plate 32. The locking seat mounting plate 31 is located at the lateral opening of the locking seat base 29 and is connected and fixed to the two locking seat side plates 33. The upper sealing guide plate 30 is bent at a 20-70 degree angle on both sides to form side guide surfaces 34 on both sides. A sealing perforation 35 is formed in the middle of the upper sealing guide plate 30. The upper sealing guide plate 30 and the locking seat base 29 are fixedly connected by fasteners, so that the sealing perforation 35 is directly opposite the opening at the upper end of the locking seat bottom plate 32. An upper sliding member 36 is provided inside the upper locking seat base 29. The upper sliding member 36 abuts against the upper locking seat base plate 32 and the upper locking seat side plate 33, allowing the upper sliding member 36 to slide vertically along the upper locking seat base 29. An upper locking seat push block 37 is fixed to the upper end of the upper sliding member 36, and the position of the upper locking seat push block 37 is directly opposite the position of the sealing through hole 35. The lower end of the upper sliding member 36 is connected to an upper connecting screw tube 38 by a pin. The lower end of the upper connecting screw tube 38 is threadedly connected to an upper rod 39. The lower end of the upper rod 39 is formed with an upper annular groove 52 that engages with the linkage component 6.

[0029] like Figure 6 As shown, the lower sealing assembly 5 is a lower sealing plate 40, and a lower sealing through hole 41 is formed in the center of the lower sealing plate 40.

[0030] like Figure 7 As shown, the lower lock seat assembly 3 includes a lower lock seat base 42, a lower lock seat mounting plate 43, a lower square pin 44 that moves vertically between the lower lock seat base 42 and the lower lock seat mounting plate 43, a pin linkage member 45 connected to the lower square pin 44, a lower connecting screw tube 46 connected to the pin linkage member 45, and a lower rod 47 threadedly engaged with the lower connecting screw tube 46. The pin linkage member 45 includes a first linkage plate 48 whose lower end is hinged to the lower square pin 44, and two second linkage plates 49 connected to the upper end of the first linkage plate 48. A linkage pin 50 is connected to the upper end of the first linkage plate 48, and the second linkage plates 49 have waist-shaped linkage holes 51 formed on them, with the length direction of the linkage holes 51 being vertical. The linkage pin 50 passes through the linkage holes 51, allowing the first linkage plate 48 and the second linkage plate 49 to rotate relative to each other and move vertically. The upper end of the second linkage plate 49 is hinged to the lower connecting screw tube 46, and the upper end of the lower rod 47 is formed with a lower annular groove 53, which is engaged and fixed with the linkage component 6.

[0031] Example 2: like Figure 8As shown, the escape door includes a door frame 54, a door panel 55, and the two-way opening structure of the escape lock described in Embodiment 1. The door frame 54 and the door panel 55 are hinged on one side. The lock body assembly 1 is installed on the front of the door panel 55. The upper lock seat assembly 2, the lower lock seat assembly 3, and the linkage assembly 6 are installed inside / on the door panel 55. The upper sealing assembly 4 is installed on the inner side of the upper end of the door frame 54, directly opposite the upper lock seat assembly 2. The lower sealing assembly 5 is installed on the inner side of the lower end of the door frame 54, directly opposite the lower lock seat assembly 3. The lower sealing plate 40 is flush with the inner side wall of the lower end of the door frame 54 and the ground.

[0032] Specific usage process: When it is necessary to open the door panel 55, press the escape lock lever 9. The escape lock lever 9 drives the downward handle 13 to rotate. During the rotation of the downward handle 13, the upper lever 18 moves upward, causing the lower square pin 44 inserted into the lower sealing through hole 41 to disengage from the lower sealing plate 40. At the same time, the upper lock seat push block 37 moves upward, pushing the upper sealing roller seat 25 into the upper sealing base 22, so that both the upper and lower ends of the door panel 55 are unlocked. At this time, the door panel 55 can be opened inward or outward.

[0033] When it is necessary to close the door panel 55, simply push the door panel 55 back to its original position. The upper sealing limit roller 26 on the upper sealing roller seat 25 will move along the upper sealing guide plate 30 to the position directly opposite the sealing through hole 35. Under the action of the upper sealing inner spring 28, the upper sealing roller seat 25 will spring into the sealing through hole 35 to complete the upper limit of the door panel 55. At the same time, the lower square pin 44 will be aligned with and inserted into the lower sealing through hole 41.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A two-way opening structure for an escape lock, characterized in that, It includes a lock body assembly (1), a linkage assembly (6), a lock base assembly, and a sealing assembly; The lock body assembly (1) is used to apply force to control unlocking; The linkage component (6) is used to synchronously drive the lock seat component when the lock body component (1) is in motion; The lock seat assembly and sealing assembly are used to cooperate in locking / unlocking the escape door. The lock seat assembly / sealing assembly includes a sealing through hole (35) and side guide surfaces (34) located on both sides of the sealing through hole (35). The sealing assembly / lock seat assembly includes a sealing pin that can be inserted into the sealing through hole (35) in cooperation with either side guide surface (34).

2. The escape lock bidirectional opening structure according to claim 1, characterized in that, The lock seat assembly includes an upper lock seat assembly (2) and a lower lock seat assembly (3), and the sealing assembly includes an upper sealing assembly (4) and a lower sealing assembly (5). The upper lock seat assembly (2) and the upper sealing assembly (4) are used to cooperate in locking / unlocking the upper side of the escape door; the lower lock seat assembly (3) and the lower sealing assembly (5) are used to cooperate in locking / unlocking the lower side of the escape door.

3. The escape lock bidirectional opening structure according to claim 2, characterized in that, The sealing assembly includes an upper sealing base (22) for installation in the door frame (54) of the escape door. The upper sealing base (22) has an upper sealing groove (23) formed on its upper end surface. The bottom of the upper sealing groove (23) has an upper sealing through hole (24) with a size smaller than that of the upper sealing groove (23). The sealing pin includes an upper sealing roller seat (25) and an upper sealing limiting roller (26) rotatably connected to the lower end of the upper sealing roller seat (25). The size of the upper sealing roller seat (25) is larger than that of the upper sealing through hole (24) and smaller than that of the upper sealing roller seat (25). The lower end of the upper sealing limiting roller (26) extends out of the upper sealing base (22). The upper sealing base (22) is provided with an upper sealing inner spring (28) that applies downward pressure to the upper sealing roller seat (25).

4. The escape lock bidirectional opening structure according to claim 3, characterized in that, An upper sealing cover plate (27) is installed near the upper end of the upper sealing groove (23), and the upper sealing inner spring (28) is located in the upper sealing groove (23) between the upper sealing cover plate (27) and the upper sealing roller seat (25).

5. The escape lock bidirectional opening structure according to claim 4, characterized in that, The locking seat assembly (2) includes a locking seat base (29), an upper sealing guide plate (30) connected to the upper end of the locking seat base (29), and a locking seat mounting plate (31) installed on the side of the locking seat base (29). The locking seat base (29) includes a locking seat bottom plate (32) and locking seat side plates (33) located on both sides of the locking seat bottom plate (32) at a 90-degree angle to the locking seat bottom plate (32). The locking seat mounting plate (31) is located at the lateral opening of the locking seat base (29) and is connected and fixed to the two locking seat side plates (33).

6. The escape lock bidirectional opening structure according to claim 5, characterized in that, The included angle between the side guide surfaces (34) formed by bending the upper sealing guide plate (30) on both sides is 20-70 degrees.

7. The escape lock bidirectional opening structure according to claim 5, characterized in that, The upper sliding member (36) is provided inside the upper locking base (29). The upper sliding member (36) abuts against the upper locking base plate (32) and the upper locking side plate (33), so that the upper sliding member (36) can slide along the upper locking base (29) in the vertical direction. The upper sliding member (36) is fixed with an upper locking push block (37), and the position of the upper locking push block (37) is directly opposite the position of the sealing through hole (35). The lower end of the upper sliding member (36) is connected to an upper connecting screw tube (38) by a pin. The lower end of the upper connecting screw tube (38) is threadedly connected to an upper rod (39). The lower end of the upper rod (39) is connected to the linkage component (6).

8. The escape lock bidirectional opening structure according to claim 5, characterized in that, The lower lock seat assembly (3) includes a lower lock seat base (42), a lower lock seat mounting plate (43), a lower square pin (44) that moves up and down between the lower lock seat base (42) and the lower lock seat mounting plate (43), a pin linkage (45) connected to the lower square pin (44), a lower connecting threaded tube (46) connected to the pin linkage (45), and a lower rod (47) that is threadedly engaged with the lower connecting threaded tube (46).

9. An escape door, characterized in that, The device includes a door frame (54), a door panel (55), and a two-way opening structure for an escape lock as described in any one of the claims. The door frame (54) and the door panel (55) are hinged on one side. The lock seat assembly includes an upper lock seat assembly (2) and a lower lock seat assembly (3). The sealing assembly includes an upper sealing assembly (4) and a lower sealing assembly (5). The lock body assembly (1) is installed on the front of the door panel (55). The upper lock seat assembly (2), the lower lock seat assembly (3), and the linkage assembly (6) are installed inside / on the door panel (55). The upper sealing assembly (4) is installed on the inner side of the upper end of the door frame (54) directly opposite the upper lock seat assembly (2). The lower sealing assembly (5) is installed on the inner side of the lower end of the door frame (54) directly opposite the lower lock seat assembly (3).