A sublock structure for a motor home door lock

Abstract

A kind of sublock structure for motor home door lock, including being provided with the sublock body in the door of house, the lock catch box being provided on the door frame of house car and the lock hook being provided on the outer door of house car;The sublock body includes the first locking mechanism and the second locking mechanism in the sublock shell;The first locking mechanism is connected with the main lock of motor home door lock by first connecting rod;The second locking mechanism is connected with the main lock of motor home door lock by second connecting rod;The first locking mechanism includes the sublock tongue and the first lock plate of transmission connection;Swing groove is opened on the lock catch box, the other end of the sublock tongue can swing and be provided in the swing groove, and a section of clamping rib is further protruded on the side wall of the swing groove, and the other end of the sublock tongue is opened with clamping groove;The structure of the first locking mechanism of the application is simple, and the switching process is smooth, which can not only improve the service life of the entire sublock, but also effectively save the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of recreational vehicle door locks, in particular to a sub-lock structure for a recreational vehicle door lock. BACKGROUND

[0002] A recreational vehicle, also known as a motor home, is a vehicle that can be parked anywhere, such as on a beach, by a lake, on grass, on a hillside, or in a forest, while still having the lifestyle of a city: cooking delicious meals, taking a hot shower, sleeping on a soft bed, watching TV, listening to music, and playing DVDs.

[0003] A recreational vehicle is similar to a scaled-down house and can be divided into two types: self-propelled and towed. In addition to the cab, both types of recreational vehicles have a living space behind the cab, which includes a bedroom, a bathroom with a toilet, a sink, and a bathtub, a living room, and an open kitchen. Therefore, in addition to the door of the cab, a recreational vehicle door is also provided for the living space. For safety and comfort, the existing recreational vehicle door generally has a double-layer structure. At night, both doors can be closed for safety, and during the day, the outer door can be opened and the inner door, which is a screen door, can be closed to keep out mosquitoes.

[0004] There are two common ways to set the lock of the double-layer door of the existing recreational vehicle. One is to provide a separate lock system for each door to achieve independent opening and closing. The other is to use the same lock system for both doors. In this arrangement, the doors are locked together when opening and closing, and the lock system can unlock the doors to allow them to be opened and closed independently. In addition, regardless of the arrangement, the existing recreational vehicle door generally has two sub-locks similar to mortise locks in addition to the main lock located in the middle of the side of the door. The main lock and the sub-locks are connected, and the locking structure between the doors is usually integrated into the sub-locks.

[0005] As disclosed in Chinese patent application No. CN202110908272.1: "A double-door control lock includes a lock housing, an inner lock plate, an outer lock plate, and a mortise lock. It also includes a handle linkage unit. The mortise lock includes a lock piece, a transmission piece, a transmission rod, a mortise lock box, a screen door transmission rod, and a screen door lock column. The handle linkage unit connects the transmission piece and the screen door transmission piece through the transmission rod and the screen door transmission rod, connecting the lock cylinder at both ends. The mortise lock box locks the main door and the screen door together through the transmission rod."

[0006] But including the scheme recorded in the above patent, the existing house car door lock system in the sub lock structure is generally rely on complex gear transmission to realize the locking and unlocking of the sub lock, and the locking and unlocking between the outer door and the inner door; But the gear transmission sub lock structure not only the structure is too complex, and use time long after very easy to appear jammed lead to often need maintenance. SUMMARY

[0007] In order to overcome the deficiency of the prior art of the house car door lock sub lock structure is complex and easy to jam, the present application provides a test tool for sealing ring air tightness detection.

[0008] The technical scheme of the present application solves its technical problems: a sub lock structure for a house car door lock, comprising a sub lock body provided on the inner door of the house, a lock catch box provided on the door frame of the house car, and a lock hook provided on the outer door of the house car;

[0009] The sub lock body comprises a sub lock shell and a first locking mechanism and a second locking mechanism arranged in the sub lock shell;

[0010] The first locking mechanism is connected with the main lock of the house car door lock through a first connecting rod, and the first locking mechanism can change its position state relative to the lock catch box under the driving of the first connecting rod, and the first locking mechanism has at least a locking position state and an unlocking position state relative to the lock catch box;

[0011] The second locking mechanism is connected with the main lock of the house car door lock through a second connecting rod, and the second locking mechanism can change its position state relative to the lock hook under the driving of the second connecting rod, and the second locking mechanism has at least a locking position state and an unlocking position state relative to the lock hook;

[0012] The first locking mechanism comprises a sub lock tongue and a first lock plate connected in transmission, one end of the sub lock tongue is hinged with the sub lock shell, the first lock plate is connected with the first connecting rod, the first lock plate can move under the driving of the first connecting rod and push the sub lock tongue to swing relative to the lock catch box, the first locking mechanism changes its position state relative to the lock catch box by swinging the sub lock tongue; The lock catch box is provided with a swing groove, the other end of the sub lock tongue can swing and is arranged in the swing groove, and a clamping rib is protruded on the side wall of the swing groove, and a clamping groove is formed on the other end of the sub lock tongue;

[0013] When the first locking mechanism is in the locking position state relative to the lock catch box, the clamping rib and the clamping groove form interference fit, thereby preventing the sub lock tongue from being separated from the lock catch box;

[0014] When the first locking mechanism is in the unlocking position relative to the lock box, the interference between the clamping rib and the clamping groove is removed, so that the auxiliary lock bolt can be separated from the lock box.

[0015] Further to the structure that the auxiliary lock bolt is separated from the lock box, a separation window is further formed in the side wall of the swing groove above the clamping rib, when the first locking mechanism is in the unlocking position, one end of the auxiliary lock bolt swings to the separation window, at this time the auxiliary lock bolt can be separated from the lock box through the separation window.

[0016] Further to the auxiliary structure of the clamping groove and the clamping rib, an auxiliary roller is further rotatably arranged in the clamping groove of the auxiliary lock bolt, when the clamping rib and the clamping groove are clamped together, the auxiliary roller is abutted and matched on the clamping rib, and with the swing of the auxiliary lock bolt, the auxiliary roller can be rotated under the action of the clamping rib.

[0017] Further to the transmission structure between the first lock plate and the auxiliary lock bolt, a driving groove is further formed at the middle position of the auxiliary lock bolt, and a driving column is further protruded from the first lock plate towards the auxiliary lock bolt, the driving column is inserted and matched in the driving groove, when the first lock plate moves, the driving column translates up and down, thereby pushing the auxiliary lock bolt to swing up and down.

[0018] Further to the specific matching mode of the driving groove and the driving column, the driving groove is formed along the length direction of the auxiliary lock bolt, the driving column can slide along the driving groove in the process of up and down translation, and a anti-disengagement rib with a width greater than the width of the driving groove is further protruded on the top of the driving column.

[0019] Further to the specific structure of the auxiliary lock shell, a fixed seat and a moving seat are further arranged on the front side of the auxiliary lock shell, the fixed seat is fixedly connected on the auxiliary lock shell, and a hinge column for hinge matching with one end of the auxiliary lock bolt is further protruded on the fixed seat; the driving column is protruded on the moving seat, and the moving seat is connected on the first lock plate through bolts, so that the moving seat can move relative to the auxiliary lock shell under the driving of the first lock plate.

[0020] Further to the moving guide structure of the moving seat, a connecting part for connecting with the first lock plate is arranged on the back side of the moving seat, and a guide groove is formed on the auxiliary lock shell, the connecting part can be slidably inserted into the guide groove, when the moving seat moves under the driving of the first lock plate, the connecting part slides along the guide groove.

[0021] The hinge structure between the auxiliary lock tongue and the fixed seat further comprises a hinge groove formed on the end of the auxiliary lock tongue that is hingedly connected to the fixed seat, and the hinge column is inserted into the hinge groove, and the hinge column can slide along the hinge groove during the swinging of the auxiliary lock tongue.

[0022] The body structure of the second locking mechanism further comprises a second lock plate that is in driving connection with the second connecting rod, the second lock plate has a locking groove, the locking hook is inserted into the locking groove, and the locking hook has a locking notch; the second lock plate can be translated under the driving of the second connecting rod, and the locking hook can slide along the locking groove, so that the second locking mechanism changes its position state relative to the locking hook;

[0023] When the second locking mechanism is in the locking position state relative to the locking hook, the edge of the locking groove interferes with the locking notch, so as to prevent the second lock plate from being separated from the locking hook;

[0024] When the second locking mechanism is in the unlocking position state relative to the locking hook, the interference between the edge of the locking groove and the locking notch is removed, and the second lock plate can be separated from the locking hook.

[0025] The matching mode between the locking hook and the second lock plate further comprises that a through hole is formed in the auxiliary lock shell, the head of the locking hook with the locking notch extends into the auxiliary lock shell through the through hole, so as to match the second lock plate.

[0026] The limiting structure for the movement of the second lock plate further comprises that a limiting column is protruded inside the auxiliary lock shell, a limiting groove is formed in the second lock plate along the length direction of the second lock plate, the limiting column is inserted into the limiting groove, and the limiting column can slide along the limiting groove with the translation of the second lock plate.

[0027] The auxiliary unlocking structure of the second locking mechanism further includes a protruding abutment plate on the top of the second locking plate. A guide bolt is threaded through the abutment plate, with its lower end threaded onto the secondary lock housing. A return spring is also fitted onto the guide bolt, acting between the abutment plate and the secondary lock housing, causing the abutment plate to have a tendency to move away from the secondary lock housing. When the second locking plate is not subjected to external force, the edge of the locking groove and the locking notch remain in an interference fit state under the action of the return spring. When the second locking plate moves under the action of external force, and the external force no longer acts on the second locking plate, the return spring can push the second locking plate back to its original position.

[0028] The unlocking method of the secondary lock of the present invention is as follows: When the entire RV door is being opened, by turning the handle on the main lock of the RV door lock, the first linkage can be moved, and the first lock plate will also be translated under the action of the first linkage. At the same time, the first lock plate drive moving seat is translated accordingly, causing the drive rod on it to push the secondary lock tongue to swing relative to the strike box. The locking groove on the secondary lock tongue is misaligned with the locking rib on the strike box as the secondary lock tongue swings, thereby releasing the interference between the two. The end of the secondary lock tongue with the locking groove also swings to the disengagement window. At this time, pushing the RV door can make the secondary lock tongue disengage from the strike box through the disengagement window, thus completing the unlocking between the secondary lock body and the strike box.

[0029] During the separation of the inner and outer doors of the RV, turning the unlocking knob on the main lock of the RV door will move the second linkage. The second lock plate will also move relative to the lock hook under the action of the second linkage. The locking groove, which originally interfered with the locking notch on the lock hook, will be misaligned with the locking notch as the second lock plate moves, thus removing the interference between the locking groove and the locking notch. At this time, pushing the outer door of the RV will allow the lock hook to disengage from the secondary lock housing through the through hole on the secondary lock body, thus completing the unlocking between the secondary lock body and the lock hook.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. Two independent locking mechanisms are set up to lock and unlock the entire RV door and the inner and outer doors of the RV door respectively. The first locking mechanism switches between locking and unlocking states by pushing the secondary lock tongue to swing relative to the lock box. This makes the structure of the first locking mechanism simpler and the switching process smoother. It can not only improve the life of the entire secondary lock but also effectively save costs.

[0032] 2. An auxiliary roller is also provided in the locking groove of the secondary lock tongue. When the locking groove and the locking rib of the lock box form a locking engagement, the auxiliary roller can abut against the locking rib, thereby improving the firmness of the engagement between the locking groove and the locking rib. When the secondary lock tongue swings relative to the locking rib during the unlocking process, the auxiliary roller can improve the smoothness of unlocking by rotating relative to the locking rib.

[0033] 3. The hinge slot at one end of the secondary latch engages with the hinge pin on the fixed base, allowing the secondary latch to swing around the junction slot as the rotation center. During the swing, the hinge pin can slide within the hinge slot to a certain extent, preventing wear between the hinge pin and the hinge slot during the swing. The swing is driven by the drive pin on the moving base and the drive slot on the secondary latch, making the drive structure simpler. At the same time, the anti-disengagement slot on the drive pin ensures that the secondary latch will not misalign with the drive pin during the drive process.

[0034] 4. The second locking mechanism uses a locking groove on the second lock plate and a locking notch on the lock hook to lock and unlock. Therefore, the state switching of the second locking mechanism only requires pushing the second lock plate to move, which makes the structure of the second locking mechanism simpler and independent of the first locking mechanism, effectively avoiding mutual interference. Attached Figure Description

[0035] Figure 1 This is a front structural diagram of the present invention.

[0036] Figure 2 This is a schematic diagram of the rear structure of the present invention.

[0037] Figure 3 This is an exploded view of the present invention.

[0038] Figure 4 This is a schematic diagram of the state when the first locking mechanism in the present invention is in the locked position.

[0039] Figure 5 This is a cross-sectional view of the first locking mechanism in the present invention when it is in the unlocked position.

[0040] Figure 6 This is a cross-sectional view of the first locking mechanism in the present invention when it is in the locked position.

[0041] Figure 7 This is a cross-sectional view of the second locking mechanism in the present invention when it is in the locked position.

[0042] Figure 8 This is a cross-sectional view of the second locking mechanism in the present invention when it is in the unlocked position.

[0043] Figure 9 This is a schematic diagram of the secondary locking tongue in this invention.

[0044] Figure 10 This is a schematic diagram of the movable base in this invention.

[0045] The following are the labeling elements in the diagram: 1. Secondary lock housing; 2. Snap lock box; 3. Lock hook; 4. First connecting rod; 5. Secondary connecting rod; 6. Secondary lock tongue; 7. First lock plate; 8. Swing groove; 9. Snap-fit ​​rib; 10. Snap-fit ​​groove; 11. Auxiliary roller; 12. Drive groove; 13. Drive column; 14. Anti-detachment rib; 15. Fixed base; 16. Moving base; 17. Hinge column; 18. Connecting part; 19. Guide groove; 20. Hinge groove; 21. Second lock plate; 22. Locking groove; 23. Locking notch; 24. Through hole; 25. Limiting column; 26. Limiting groove; 27. Abutment plate; 28. Guide bolt; 29. ​​Return spring; 30. Disengagement window. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0047] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0048] Example

[0049] Combination Figures 1 to 3The diagram illustrates a secondary lock structure for a motorhome door lock, comprising a secondary lock body mounted on the interior door of the motorhome, a strike box 2 mounted on the door frame, and a lock hook 3 mounted on the exterior door. The secondary lock body includes a secondary lock housing 1 and a first locking mechanism and a second locking mechanism disposed within the secondary lock housing 1. The first locking mechanism is connected to the main lock of the motorhome door lock via a first connecting rod 4, and the first locking mechanism can change its position relative to the strike box 2 under the action of the first connecting rod 4, and the first locking mechanism has at least a locked position and an unlocked position relative to the strike box 2. The second locking mechanism is connected to the main lock of the motorhome door lock via a second connecting rod 5, and the second locking mechanism can change its position relative to the lock hook 3 under the action of the second connecting rod 5, and the second locking mechanism can change its position relative to the lock hook 3. The second locking mechanism has at least a locked position and an unlocked position relative to the locking hook 3; the first locking mechanism includes a secondary locking tongue 6 and a first locking plate 7 that are connected in a transmission manner. One end of the secondary locking tongue 6 is hinged to the secondary lock housing 1. The first locking plate 7 is connected to the first connecting rod 4. The first locking plate 7 can move under the drive of the first connecting rod 4 and push the secondary locking tongue 6 to swing relative to the lock box 2. The first locking mechanism achieves a change in position relative to the lock box 2 by swinging the secondary locking tongue 6; the lock box 2 is provided with a swing groove 8. The other end of the secondary locking tongue 6 can swing through the swing groove 8. A section of locking rib 9 is also protruding from the side wall of the swing groove 8. The other end of the secondary locking tongue 6 is provided with a locking groove 10.

[0050] Among them, such as Figure 4 and Figure 6 As shown, when the first locking mechanism is in the locked position relative to the lock box 2, the locking rib 9 and the locking groove 10 form an interference fit, thereby preventing the secondary locking tongue 6 from disengaging from the lock box 2.

[0051] Among them, such as Figure 1 and Figure 5 As shown, when the first locking mechanism is in the unlocked position relative to the lock box 2, the interference between the locking rib 9 and the locking groove 10 is released. Since the side wall of the swing groove 8 is provided with a release window 30 above the locking rib 9, one end of the secondary locking tongue 6 swings to the release window 30. At this time, the secondary locking tongue 6 can be released from the lock box 2 through the release window 30.

[0052] Combination Figure 9As shown, in this embodiment, an auxiliary roller 11 can also be rotatably disposed in the locking groove 10 of the secondary locking tongue 6. When the locking rib 9 and the locking groove 10 form a locking engagement, the auxiliary roller 11 abuts against the locking rib 9, and as the secondary locking tongue 6 swings, the auxiliary roller 11 can rotate under the action of the locking rib 9.

[0053] In this embodiment, a drive groove 12 is provided at the middle position of the secondary locking tongue 6, and a drive post 13 is protruding from the first locking plate 7 toward the secondary locking tongue 6. The drive post 13 is inserted into the drive groove 12. When the first locking plate 7 moves, the drive post 13 moves up and down accordingly, thereby pushing the secondary locking tongue 6 to swing up and down.

[0054] In this embodiment, the drive groove 12 is opened along the length direction of the secondary locking tongue 6, the drive column 13 can slide along the drive groove 12 during the up and down translation process, and an anti-detachment rib 14 with a width greater than the width of the drive groove 12 is also provided on the top of the drive column 13.

[0055] In this embodiment, a fixed seat 15 and a movable seat 16 are provided on the front side of the secondary lock housing 1. The fixed seat 15 is fixedly connected to the secondary lock housing 1, and a hinge post 17 is protruding on the fixed seat 15 for forming a hinged engagement with one end of the secondary lock tongue 6. The drive post 13 protrudes on the movable seat 16, and the movable seat 16 is bolted to the first lock plate 7, so that the movable seat 16 can move relative to the secondary lock housing 1 under the drive of the first lock plate 7.

[0056] Reference Figure 10 As shown, in this embodiment, the rear side of the movable seat 16 is provided with a connecting part 18 for connecting with the first locking plate, and the secondary lock housing 1 is provided with a guide groove 19. The connecting part 18 can be slidably inserted into the guide groove 19. When the movable seat 16 moves under the drive of the first locking plate 7, the connecting part 18 slides along the guide groove 19.

[0057] In this embodiment, a hinge groove 20 is provided on one end of the secondary locking tongue 6 that forms a hinged engagement with the fixed base 15. The hinge pin 17 is inserted into the hinge groove 20, and the hinge pin 17 can slide along the hinge groove 20 during the swinging process of the secondary locking tongue 6.

[0058] Reference Figure 2 and Figure 3As shown, in this embodiment, the second locking mechanism includes a second locking plate 21 that is connected to the second connecting rod 5 in a transmission manner. The second locking plate 21 has a locking groove 22, and the locking hook 3 is inserted into the locking groove 22. The locking hook 3 also has a locking notch 23. The second locking plate 21 can be translated under the drive of the second connecting rod 5, and the locking hook 3 can slide along the locking groove 22, thereby realizing the change of position of the second locking mechanism relative to the locking hook 3.

[0059] Among them, such as Figure 7 As shown, when the second locking mechanism is in the locked position relative to the locking hook 3, the edge of the locking groove 22 and the locking notch 23 form an interference fit, thereby preventing the second locking plate 21 from separating from the locking hook 3.

[0060] Among them, such as Figure 8 As shown, when the second locking mechanism is in the unlocked position relative to the locking hook 3, the interference between the edge of the locking groove 22 and the locking notch 23 is released, and the second locking plate 21 can be separated from the locking hook 3.

[0061] In this embodiment, a through hole 24 is provided on the secondary lock housing 1, and the head of the lock hook 3 with a locking notch 23 extends into the secondary lock housing 1 through the through hole 24, thereby realizing the cooperation between the lock hook 3 and the second lock plate 21.

[0062] In this embodiment, a limiting post 25 is protruding inside the secondary lock housing 1, and a limiting groove 26 is also provided on the second lock plate 21 along its length direction. The limiting post 25 is inserted into the limiting groove 26, and as the second lock plate 21 moves, the limiting post 25 can slide along the limiting groove 26.

[0063] In this embodiment, a contact plate 27 is protruding from the top of the second locking plate 21. A guide bolt 28 is also provided on the contact plate 27. The lower end of the guide bolt 28 is threaded to the secondary lock housing 1, and a return spring 29 is also sleeved on the guide bolt 28. The return spring 29 acts between the contact plate 27 and the secondary lock housing 1, thereby giving the contact plate 27 a tendency to move away from the secondary lock housing 1. When the second locking plate 21 is not subjected to external force, the locking groove edge 22 and the locking notch 23 remain in an interference fit state under the action of the return spring 29. When the second locking plate 21 moves under the action of external force, and the external force no longer acts on the second locking plate 21, the return spring 29 can push the second locking plate 21 back to its original position.

[0064] The secondary lock unlocking method of this embodiment is as follows: When the entire RV door is being opened, by turning the handle on the main lock of the RV door lock, the first linkage 4 can be moved, and the first lock plate 7 will also be moved horizontally under the action of the first linkage 4. At the same time, the first lock plate 7 drives the moving seat 16 to move horizontally, causing the drive rod on it to push the secondary lock tongue 6 to swing relative to the strike box 2. The locking groove 10 on the secondary lock tongue 6 is misaligned with the locking rib 9 on the strike box 2 as the secondary lock tongue 6 swings, thereby releasing the interference between the two. The end of the secondary lock tongue 6 with the locking groove 10 also swings to the disengagement window 30. At this time, pushing the RV door can make the secondary lock tongue 6 disengage from the strike box 2 through the disengagement window 30, thus completing the unlocking between the secondary lock body and the strike box 2.

[0065] During the separation of the inner and outer doors of the RV, turning the unlocking knob on the main lock of the RV door can move the second linkage 5. The second lock plate 21 will also move relative to the lock hook 3 under the action of the second linkage 5. The locking groove 22, which originally interfered with the locking notch 23 on the lock hook 3, will be displaced from the locking notch 23 as the second lock plate 21 moves, thereby removing the interference between the locking groove 22 and the locking notch 23. At this time, pushing the outer door of the RV will allow the lock hook 3 to disengage from the secondary lock housing 1 through the through hole 24 on the secondary lock body, thus completing the unlocking between the secondary lock body and the lock hook 3.

[0066] The advantage of this embodiment is that the secondary lock relies on two independent locking mechanisms to cooperate with the latch and the hook respectively, so that the two locking mechanisms will not interfere with each other. Moreover, the structures of the two locking mechanisms are relatively simple, and the state switching of the two locking mechanisms is very smooth. While meeting the functional requirements of the RV door lock secondary lock, it effectively improves the overall service life of the secondary lock and saves costs.

[0067] The above specific embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A secondary lock structure for a motorhome door lock, comprising a secondary lock body disposed on the inner door of the motorhome, a lock box (2) disposed on the door frame of the motorhome, and a lock hook (3) disposed on the outer door of the motorhome; Its features are: The secondary lock body includes a secondary lock housing (1) and a first locking mechanism and a second locking mechanism disposed within the secondary lock housing (1); The first locking mechanism is connected to the main lock of the RV door lock through the first link (4), and the first locking mechanism can change its position relative to the lock box (2) under the action of the first link (4), and the first locking mechanism has at least a locked position state and an unlocked position state relative to the lock box (2). The second locking mechanism is connected to the main lock of the RV door lock through the second link (5), and the second locking mechanism can change its position relative to the lock hook (3) under the action of the second link (5), and the second locking mechanism has at least a locked position state and an unlocked position state relative to the lock hook (3); The first locking mechanism includes a secondary locking tongue (6) and a first locking plate (7) that are connected in a transmission relationship. One end of the secondary locking tongue (6) is hinged to the secondary lock housing (1). The first locking plate (7) is connected to the first connecting rod (4). The first locking plate (7) can move under the drive of the first connecting rod (4) and push the secondary locking tongue (6) to swing relative to the lock box (2). The first locking mechanism relies on the swing of the secondary locking tongue (6) to achieve a change in position relative to the lock box (2). The lock box (2) is provided with a swing groove (8). The other end of the secondary locking tongue (6) can swing through the swing groove (8). A section of snap-fit ​​rib (9) is also protruding on the side wall of the swing groove (8). The other end of the secondary locking tongue (6) is provided with a snap-fit ​​groove (10). When the first locking mechanism is in the locked position relative to the lock box (2), the snap-fit ​​rib (9) and the snap-fit ​​groove (10) form an interference fit, thereby preventing the secondary lock tongue (6) from disengaging from the lock box (2); When the first locking mechanism is in the unlocked position relative to the lock box (2), the interference between the locking rib (9) and the locking groove (10) is released, thereby allowing the secondary locking tongue (6) to disengage from the lock box (2); An auxiliary roller (11) can also be rotatably provided in the snap-fit ​​groove (10) of the secondary locking tongue (6). When the snap-fit ​​rib (9) and the snap-fit ​​groove (10) form a snap-fit ​​engagement, the auxiliary roller (11) abuts against the snap-fit ​​rib (9). As the secondary locking tongue (6) swings, the auxiliary roller (11) can rotate under the action of the snap-fit ​​rib (9). A drive groove (12) is provided at the middle position of the secondary lock tongue (6). A drive post (13) is protruding from the first lock plate (7) toward the secondary lock tongue (6). The drive post (13) is inserted into the drive groove (12). When the first lock plate (7) moves, the drive post (13) moves up and down, thereby pushing the secondary lock tongue (6) to swing up and down.

2. The secondary lock structure for a motorhome door lock according to claim 1, characterized in that: The drive groove (12) is opened along the length direction of the secondary locking tongue (6). The drive post (13) can slide along the drive groove (12) during the up and down translation process. Furthermore, an anti-detachment rib (14) with a width greater than the width of the drive groove (12) is also protruding from the top of the drive post (13).

3. The secondary lock structure for a motorhome door lock according to claim 1, characterized in that: The front side of the secondary lock housing (1) is also provided with a fixed seat (15) and a movable seat (16). The fixed seat (15) is fixedly connected to the secondary lock housing (1), and the fixed seat (15) is also provided with a hinge post (17) for one end of the secondary lock tongue (6) to form a hinge engagement. The drive post (13) is provided on the movable seat (16), and the movable seat (16) is connected to the first lock plate (7) by bolts, so that the movable seat (16) can move relative to the secondary lock housing (1) under the drive of the first lock plate (7).

4. The secondary lock structure for a motorhome door lock according to claim 3, characterized in that: The secondary locking tongue (6) is provided with a hinge groove (20) at one end that forms a hinge engagement with the fixed base (15). The hinge pin (17) is inserted into the hinge groove (20), and the hinge pin (17) can slide along the hinge groove (20) during the swinging process of the secondary locking tongue (6).

5. The secondary lock structure for a motorhome door lock according to claim 1, characterized in that: The second locking mechanism includes a second locking plate (21) that is connected to the second connecting rod (5) in a transmission manner. The second locking plate (21) has a locking groove (22) and the locking hook (3) is inserted into the locking groove (22). The locking hook (3) also has a locking notch (23). The second locking plate (21) can be translated under the drive of the second connecting rod (5) and the locking hook (3) can slide along the locking groove (22), thereby realizing the change of position of the second locking mechanism relative to the locking hook (3). When the second locking mechanism is in the locked position relative to the locking hook (3), the edge of the locking groove (22) and the locking notch (23) form an interference fit, thereby preventing the second locking plate (21) from separating from the locking hook (3); When the second locking mechanism is in the unlocked position relative to the locking hook (3), the interference between the edge of the locking groove (22) and the locking notch (23) is released, and the second locking plate (21) can be separated from the locking hook (3).

6. The secondary lock structure for a motorhome door lock according to claim 5, characterized in that: The inner part of the secondary lock housing (1) is also provided with a limiting post (25), and the second lock plate (21) is also provided with a limiting groove (26) along its length direction. The limiting post (25) is inserted into the limiting groove (26), and as the second lock plate (21) moves, the limiting post (25) can slide along the limiting groove (26).

7. The secondary lock structure for a motorhome door lock according to claim 5, characterized in that: The top of the second locking plate (21) is also provided with an abutment plate (27), and a guide bolt (28) is also provided on the abutment plate (27). The lower end of the guide bolt (28) is threaded to the sub-lock housing (1), and a return spring (29) is also sleeved on the guide bolt (28). The return spring (29) acts between the abutment plate (27) and the sub-lock housing (1), so that the abutment plate (27) has a tendency to move away from the sub-lock housing (1).

Images