Blocking and limiting mechanism of dragging type motor home expansion mechanism

Abstract

The utility model discloses a blocking and limiting mechanism of a dragging type touring car expansion mechanism, which belongs to the technical field of touring car expansion and comprises an expansion mechanism and a blocking and limiting mechanism. The expanding mechanism comprises a supporting pipe, an expanding rod is slidably connected into the supporting pipe, and the expanding rod is driven by a motor to move relative to the supporting pipe; the blocking and limiting mechanism comprises a brake plate connected to the tail end of the expansion rod and further comprises a baffle connected to the supporting pipe and a limiting plate connected to the expansion rod. When the limiting plate abuts against the baffle or the head end of the brake plate abuts against the tail end of the supporting pipe, the motor is overloaded and powered off; a plurality of groups of baffle holes are formed in the supporting pipe for mounting baffles; a plurality of limiting holes are formed in the expansion rod and used for mounting the limiting plates; the extending length of the expansion rod relative to the supporting pipe is changed by changing the position of the baffle on the supporting pipe or changing the position of the limiting plate on the expansion rod. The problems that in the prior art, the needed space cannot be adjusted, an electromagnet is adopted by a limiting assembly to control lifting of a limiting rod, and reliability is low are solved.

Description

Technical Field

[0001] This utility model belongs to the field of RV expansion technology, specifically relating to a blocking and limiting mechanism for a towable RV expansion mechanism. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] A motorhome is a special vehicle that integrates "clothing, food, housing, and transportation." In order to expand the interior space when parked and meet the comfort needs of users, it is often equipped with a space expansion mechanism.

[0004] The prior art discloses a safe and practical RV space expansion mechanism, including a frame and an expansion compartment. The expansion compartment is slidably disposed within the frame. A guide component, a drive component, and a limiting component are provided between the expansion compartment and the frame. Under the action of the drive component, the expansion compartment moves along the frame guided by the guide component. The limiting component is located on the upper side of the expansion compartment. When the expansion compartment is fully extended or retracted, the limiting component limits the expansion compartment.

[0005] While the above solution can achieve the limiting function for the extension mechanism, it has the following drawbacks:

[0006] The limiting component can only limit the extension compartment when it is fully extended or retracted, and users cannot adjust the required space according to different usage scenarios and needs. In addition, the limiting component uses an electromagnet to control the raising and lowering of the limiting rod, and the limiting component cannot work when the circuit fails, resulting in low reliability. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a blocking and limiting mechanism for a towable RV extension mechanism, which solves the problems of existing technologies that cannot adjust the required space according to different usage scenarios and needs; and the low reliability of the limiting component that uses an electromagnet to control the lifting and lowering of the limiting rod.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A blocking and limiting mechanism for a towable RV extension mechanism is provided, including an extension mechanism and a blocking and limiting mechanism; the extension mechanism includes a support tube, and an extension rod is slidably connected inside the support tube, and the extension rod is driven by a motor to move relative to the support tube;

[0010] The blocking and limiting mechanism includes a brake plate connected to the tail end of the extension rod, a baffle connected to the support tube, and a limiting plate connected to the extension rod; when the limiting plate abuts against the baffle, or when the head end of the brake plate abuts against the tail end of the support tube, the motor is overloaded and disconnected from power.

[0011] Multiple sets of baffle holes are made on the support tube for installing baffles; multiple limiting holes are made on the extension rod for installing limiting plates; by changing the position of the baffle on the support tube or the position of the limiting plate on the extension rod, the length of the extension rod extending relative to the support tube can be changed.

[0012] Preferably, the support tube is hollow inside and open at the bottom, with bottom support plates connected to both sides of the bottom of the support tube, and a slot reserved between the bottom support plates. The bottom of the extension rod is connected to a limiting plate and a rack rod, and a rack is fixed at the bottom of the rack rod. The limiting plate and the rack rod extend out of the support tube through the slot.

[0013] Preferably, the width of the rack rod is less than the width of the slot, the length of the rack rod is less than the length of the extension rod, the tail end of the rack rod coincides with the vertical projection of the head end of the brake plate, the limiting plate is installed on the side of the extension rod away from the rack rod, and multiple limiting holes are opened on the bottom axis of the extension rod.

[0014] Preferably, the tail end of the support tube is connected to two drive connecting plates, and a drive shaft is rotatably connected between the drive connecting plates. One end of the drive shaft is connected to a drive tube, and the other end of the drive tube is connected to the motor output end. Between the two drive connecting plates, a gear is connected on the drive shaft, and the gear meshes with the rack at the bottom of the rack rod.

[0015] Preferably, multiple first positioning holes are formed on the top surface of the extension rod and the support tube, and the first positioning holes of the extension rod coincide with the vertical projection of the limiting hole; the head end of the brake plate abuts against the tail end of the support tube, and the first positioning holes on the extension rod and the support tube coincide.

[0016] Preferably, the limiting plate is an L-shaped plate, including a flat plate and a longitudinal plate that are perpendicular to each other and fixedly connected. A first threaded hole is opened on the flat plate so that the first threaded hole is aligned with the corresponding limiting hole. The flat plate is fixedly connected to the bottom surface of the extension rod with limiting plate bolts.

[0017] Preferably, a reinforcing plate is provided between the flat plate and the longitudinal plate, and the reinforcing plate is fixedly connected to the flat plate and the longitudinal plate. Both the flat plate and the reinforcing plate are located on the side of the longitudinal plate facing the front of the vehicle. The reinforcing plate is connected to the side of the flat plate and the longitudinal plate facing the inside of the vehicle. A rubber pad is also fixedly installed on the side of the longitudinal plate facing the rear of the vehicle.

[0018] Preferably, the baffle is a U-shaped baffle, including a horizontal plate, with vertical plates connected vertically at both ends of the horizontal plate, and the vertical plates connected to the side wall of the support tube. The horizontal plate is located at the bottom of the support tube, lower than the bottom surface of the rack and pinion, and higher than the bottom surface of the limiting plate. The baffle hole is installed in conjunction with the second threaded hole on the vertical plate.

[0019] Preferably, multiple sets of second positioning holes are provided on the side walls of both the support tube and the extension rod. The number of sets of second positioning holes is the same as the number of sets of baffle holes, and the second positioning holes are provided between the multiple baffle holes in a single set.

[0020] Preferably, the head end of the brake plate abuts against the tail end of the support tube, and the extension rod and the second positioning hole on the support tube coincide.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are:

[0022] This invention features multiple sets of baffle holes on the support tube for installing baffles and multiple limiting holes on the extension rod for installing limiting plates. By changing the position of the baffles on the support tube or the position of the limiting plates on the extension rod, the length of the extension rod extending relative to the support tube can be changed, thereby altering the expansion space of the extension compartment. This solves the problem in existing technologies where the required space cannot be adjusted according to different usage scenarios and needs. By connecting the brake plate to the tail end of the extension rod, connecting the baffles to the support tube, and connecting the limiting plates to the extension rod, when the motor drives the extension rod to move towards the front of the vehicle or away from the support tube, and when the brake plate contacts the support tube or when the limiting plates contact the baffles, the motor is overloaded and disconnected from the power supply. This avoids the problem of low reliability in existing technologies where electromagnets are used to drive the limiting rod to rise and fall, and the limiting components cannot work when there is a circuit fault. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0024] Figure 1 This is a schematic diagram showing the position and structure of the brake plate according to an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the baffle and the limiting plate according to an embodiment of the present utility model;

[0026] Figure 3 This is a schematic diagram of the first positioning hole in an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the second positioning hole in an embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram showing the installation positions of the baffle and the limiting plate in an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the rubber pad according to an embodiment of the present utility model;

[0030] In the picture:

[0031] 1. Support tube; 11. Drive connecting plate; 12. Drive shaft; 13. Drive round tube; 14. First positioning hole; 15. Base plate; 16. Groove; 2. Extension rod; 21. Brake plate; 22. Baffle; 221. Baffle hole; 222. Baffle bolt; 23. Limiting plate; 231. Limiting hole; 232. Limiting plate bolt; 24. Reinforcing plate; 25. Rubber pad; 251. Buffer plate; 252. Self-locking rod; 253. Self-locking piece; 26. Second positioning hole; 27. Rack rod. Detailed Implementation

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] The present invention will now be described in detail with reference to the accompanying drawings.

[0034] A blocking and limiting mechanism is provided for a towable RV extension mechanism, such as... Figure 1 , Figure 2 As shown, it includes an expansion mechanism (installed at the rear of the RV) and a blocking and limiting mechanism. The expansion mechanism includes a support tube 1, with an expansion rod 2 slidably connected inside the support tube. The expansion rod 2 is driven by a motor to move relative to the support tube 1. The tail end of the expansion rod 2 is fixedly connected to an expansion frame, and the expansion compartment is connected to the expansion frame. The expansion rod 2 is driven by a motor to move relative to the support tube 1 a corresponding distance, thereby moving the expansion frame a corresponding distance to realize the space expansion of the RV.

[0035] like Figure 1 As shown, the blocking and limiting mechanism includes a brake plate 21, which is connected to the top surface of the tail end of the extension rod 2 (i.e., the end facing the rear of the RV). In this embodiment, the brake plate 21 is fixedly installed on the top surface of the tail end of the extension rod 2 using bolts; the top surface of the brake plate 21 is flush with the top surface of the tail end of the support tube 1.

[0036] When the motor drives the extension rod 2 to move toward the front end of the vehicle, that is, toward the support tube 1, the extension rod 2 retracts into the support tube 1. When the head end of the brake plate 21 (that is, the end toward the front of the RV) touches the tail end of the support tube 1, the extension rod 2 cannot move relative to the support tube 1 under the action of the brake plate 21 and the support tube 1. Under the blocking effect, the motor current is overloaded, and the power is cut off after the current exceeds the limit value.

[0037] like Figure 2As shown, the blocking and limiting mechanism also includes a baffle 22 and a limiting plate 23. The baffle 22 is connected to the support tube 1, and the limiting plate 23 is connected to the extension rod 2. When the motor drives the extension rod 2 to move towards the rear end of the vehicle, that is, the extension rod 2 moves away from the support tube 1, the extension rod 2 extends out of the support tube 1 and drives the extension box to expand. When the limiting plate 23 abuts against the baffle 22, the extension rod 2 cannot move relative to the support tube 1. Under the blocking effect, the motor current is overloaded, and the power is cut off after the current exceeds the limit value.

[0038] like Figures 1 to 4 As shown, in this embodiment, multiple sets of baffle holes 221 are opened on the support pipe 1, and the baffle 22 is connected to the support pipe 1 by baffle bolts 222; multiple limiting holes 231 are opened on the extension rod 2, and the limiting plate 23 is connected to the extension rod 2 by limiting plate bolts 232; by changing the position of the baffle 22 installed on the support pipe 1 or changing the position of the limiting plate 23 installed on the extension rod 2, the length of the extension rod 2 extending relative to the support pipe 1 can be changed, thereby changing the expansion space of the extension compartment.

[0039] It should be noted that in this embodiment, the brake plate 21 cooperates with the tail end of the support tube 1, and the baffle 22 cooperates with the limiting plate 23 to limit the relative position of the extension rod 2 and the support tube 1. This can avoid the problem of low reliability caused by the use of electromagnets to drive the limiting rod to rise and fall in the prior art, where the limiting component cannot work when the circuit fails.

[0040] It should also be noted that the baffle 22 or the limiting plate 23 is installed by the baffle bolt 222 or the limiting plate bolt 232, which facilitates the disassembly of the baffle 22 or the limiting plate 23 and changes the position of the baffle 22 or the limiting plate 23. This allows for the quick assembly and disassembly of the blocking and limiting mechanism without disassembling the overall structure of the extension mechanism, thereby enabling the adjustable extension distance of the extension mechanism and achieving multiple space adjustments. This not only meets the basic requirements of customers but also enhances their user experience.

[0041] like Figures 1 to 4 As shown, the support tube 1 is hollow inside with an opening at the bottom. Bottom support plates 15 are connected to both sides of the bottom of the support tube 1, and a slot 16 is reserved between the bottom support plates 15. The bottom of the extension rod 2 is connected to a limiting plate 23 and a rack rod 27. A rack is fixed to the bottom of the rack rod 27. The limiting plate 23 and the rack rod 27 extend out of the support tube 1 through the slot 16. When the extension rod 2 moves the limiting plate 23 and the rack rod 27 relative to the support tube 1, the slot 16 prevents the limiting plate 23 and the rack rod 27 from interfering with the bottom of the support tube 1, thus preventing the extension rod 2 from being unable to move relative to the support tube 1. The bottom support plates 15 provide support for the extension rod 2.

[0042] It should be noted that the circumferential cross-sectional width of the rack 27 is smaller than that of the extension rod 2 and also smaller than the width of the slot 16. The rack 27 is fixedly connected to the bottom surface of the extension rod 2, and the top axis of the rack 27 coincides with the bottom axis of the extension rod 2. The length of the rack 27 is smaller than that of the extension rod 2. The tail end of the rack 27 coincides with the vertical projection of the head end of the brake plate 21. The limiting plate 23 is installed on the side of the extension rod 2 away from the head end of the rack 27. Multiple limiting holes 231 are opened on the bottom axis of the extension rod 2 (in this embodiment, the inner wall of the limiting hole 231 is provided with internal thread) for installing the limiting plate 23.

[0043] like Figure 1 As shown, the tail end of the support tube 1 is connected to two drive connecting plates 11, and the drive connecting plates 11 are rotatably connected to the drive shaft 12. One end of the drive shaft 12 is connected to the drive tube 13, and the other end of the drive tube 13 is connected to the output end of the motor (not shown in the figure). Between the two drive connecting plates 11, a gear is connected on the drive shaft 12, and the gear meshes with the rack at the bottom of the rack rod 27.

[0044] It is understandable that the rotational force of the motor is transmitted to the transmission shaft 12 through the transmission tube 13, and then driven to move the extension rod 2 relative to the support tube 1 through the meshing of the gear and rack. When the limiting plate 23 and the baffle 22 collide, the extension rod 2 cannot move relative to the support tube 1. Under the obstruction, the motor current is overloaded, and the power is cut off after the current exceeds the limit value.

[0045] like Figure 3 As shown, multiple first positioning holes 14 are formed on the top surface of the extension rod 2 and the top surface of the support tube 1. The first positioning holes 14 of the extension rod 2 coincide with the vertical projection of the limiting hole 231. It should be noted that when the head end of the brake plate 21 abuts against the tail end of the support tube 1 (i.e., the initial position), the first positioning holes 14 on the extension rod 2 and the support tube 1 coincide. The purpose of this is to monitor whether there is a positional deviation between the support tube 1 and the extension rod 2. In the initial position, the multiple first positioning holes 14 on the extension rod 2 and the support tube 1 coincide, indicating that there is no positional deviation between the support tube 1 and the extension rod 2, and the limiting plate 23 is installed in the desired limiting hole 231. In the initial position, the multiple first positioning holes 14 on the extension rod 2 and the support tube 1 do not coincide, indicating that there is a positional deviation between the support tube 1 and the extension rod 2, and maintenance is required.

[0046] like Figure 2 , Figure 3 As shown, the limiting plate 23 is an L-shaped plate, including a flat plate and a longitudinal plate. The flat plate is connected perpendicularly to the longitudinal plate. A first threaded hole is opened on the flat plate. The flat plate is attached to the bottom surface of the extension rod 2 so that the first threaded hole is aligned with the corresponding limiting hole. The flat plate of the limiting plate 23 is fixedly connected to the bottom surface of the extension rod 2 using the limiting plate bolt 232.

[0047] like Figure 2 , Figure 3 As shown, a reinforcing plate 24 is provided between the flat plate and the longitudinal plate of the limiting plate 23. The flat plate is located on the side of the longitudinal plate facing the front of the vehicle. The reinforcing plate 24 is fixedly connected to the flat plate and the longitudinal plate, and is located on the side of the longitudinal plate facing the front of the vehicle to increase the strength of the longitudinal plate. When the extension rod 2 moves the limiting plate 23 away from the support tube 1, the longitudinal plate of the limiting plate 23 abuts against the baffle 22. The reinforcing plate can strengthen the longitudinal plate of the limiting plate 23 and prevent the longitudinal plate from bending, which would cause deviation in the limiting position. It should also be noted that the reinforcing plate 24 is connected to the side of the flat plate and the longitudinal plate facing the inside of the vehicle, which facilitates the disassembly of the limiting plate bolt 232.

[0048] like Figure 2 , Figure 3 As shown, a rubber pad 25 is also fixedly installed on the longitudinal plate of the limiting plate 23 facing the rear of the vehicle, which is used to protect the baffle 22 and the limiting plate 23 from collision and damage caused by long-term contact between the baffle 22 and the limiting plate 23.

[0049] It should be noted that, as Figure 6 As shown, the rubber pad 25 includes an integrally manufactured buffer plate 251 and a self-locking rod 252. The self-locking rod 252 has multiple self-locking tabs 253 facing the buffer plate 251. A circular hole corresponding to the size of the self-locking rod 252 is formed on the longitudinal plate of the limiting plate 23. With the buffer plate 251 of the rubber pad 25 facing the rear of the vehicle, the self-locking rod 252 is inserted into the circular hole of the longitudinal plate of the limiting plate 23. Because the rubber pad 25 is made of rubber and is elastic, the self-locking tabs 253 deform. After the self-locking rod 252 is inserted into the circular hole, the self-locking tabs 253 return to their original shape, mounting the rubber pad 25 on the longitudinal plate of the limiting plate 23 and preventing the rubber pad 25 from falling out. When the buffer plate 251 of the rubber pad 25 is damaged, the self-locking rod 252 can be cut off directly, and the rubber pad 25 can be removed and replaced.

[0050] like Figure 2 As shown, the baffle 22 is a U-shaped baffle, including a horizontal plate, with vertical plates connected vertically to both ends of the horizontal plate. The vertical plates are connected to the side walls of the support tube 1. The horizontal plate is located at the bottom of the support tube 1, lower than the bottom surface of the rack 27 and higher than the bottom surface of the limiting plate 23. This allows the rack 27 to pass through the baffle 22 normally, and causes the limiting plate 23 to collide and contact with the baffle 22, thus achieving the limiting function.

[0051] like Figure 2 , Figure 4 As shown, multiple sets of baffle holes 221 are provided on the support pipe 1 for installation in conjunction with the second threaded holes on the vertical plate of the baffle 22. In this embodiment, each set of baffle holes 221 consists of three holes, evenly arranged along the circumference of the support pipe 1 to ensure the stable fixation of the baffle 22. The vertical plate of the baffle 22 also has a number of identical, equally spaced second threaded holes, and the baffle 22 is installed on both sides of the support pipe 1 using baffle bolts 222.

[0052] like Figure 2 , Figure 4 As shown, multiple sets of second positioning holes 26 are provided on the sidewalls of both the support tube 1 and the extension rod 2. The number of sets of second positioning holes 26 is the same as the number of sets of baffle holes 221, and the second positioning holes 26 are provided between the multiple baffle holes 221 in a single set. It should be noted that when the head end of the brake plate 21 abuts against the tail end of the support tube 1 (i.e., the initial position), the second positioning holes 26 on the extension rod 2 and the support tube 1 coincide. The purpose of this is to monitor whether there is a positional deviation between the support tube 1 and the extension rod 2. In the initial position, the multiple second positioning holes 26 on the extension rod 2 and the support tube 1 coincide, indicating that there is no positional deviation between the support tube 1 and the extension rod 2, and the baffle 22 is installed in the desired baffle hole 221. In the initial position, the multiple second positioning holes 26 on the extension rod 2 and the support tube 1 do not coincide, indicating that there is a positional deviation between the support tube 1 and the extension rod 2, and maintenance is required.

[0053] In one specific implementation, such as Figure 5 As shown, three sets of baffle holes are provided on the support tube 1 for installing baffles (the three baffles shown in the figure are only for illustrative purposes; not all three baffles are installed simultaneously, only one baffle is installed). Three limiting holes are provided on the extension rod 2 for installing limiting plates (the three limiting plates shown in the figure are only for illustrative purposes; not all three baffles are installed simultaneously, only one limiting plate is installed). By installing the baffles and limiting plates in different positions, different extension lengths can be achieved, thus realizing an adjustable extension distance of 18 inches, 24 inches, 30 inches, 37 inches, 40 inches, and other multiple settings.

[0054] It should be noted that in this embodiment, when the extension mechanism is in its initial position (i.e., when the brake plate head is in contact with the support tube tail), the blocking and limiting mechanism can be quickly disassembled and reassembled without disassembling the overall structure of the extension mechanism. This allows for adjustable extension distance (e.g., 18 inches, 24 inches, 30 inches, 37 inches, 40 inches, etc.), thus enabling various space adjustments. This satisfies basic customer requirements while enhancing the user experience.

[0055] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A blocking and limiting mechanism for a towable RV extension mechanism, characterized in that, It includes an expansion mechanism and a blocking and limiting mechanism; the expansion mechanism includes a support tube, and an expansion rod is slidably connected inside the support tube, and the expansion rod is driven by a motor to move relative to the support tube; The blocking and limiting mechanism includes a brake plate connected to the tail end of the extension rod, a baffle connected to the support tube, and a limiting plate connected to the extension rod; when the limiting plate abuts against the baffle, or when the head end of the brake plate abuts against the tail end of the support tube, the motor is overloaded and powered off. The support tube has multiple sets of baffle holes for installing baffles; the extension rod has multiple limiting holes for installing limiting plates; changing the position of the baffle on the support tube or changing the position of the limiting plate on the extension rod changes the length of the extension rod extending relative to the support tube.

2. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 1, characterized in that, The support tube is hollow inside and open at the bottom. The bottom of the support tube is connected to the bottom support plates on both sides. A slot is reserved between the bottom support plates. The bottom of the extension rod is connected to the limiting plate and the rack rod. The rack rod is fixed at the bottom. The limiting plate and the rack rod extend out of the support tube through the slot.

3. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 2, characterized in that, The width of the rack rod is less than the width of the slot, the length of the rack rod is less than the length of the extension rod, the tail end of the rack rod coincides with the vertical projection of the head end of the brake plate, the limiting plate is installed on the side of the extension rod away from the rack rod, and multiple limiting holes are opened on the bottom axis of the extension rod.

4. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 3, characterized in that, The tail end of the support tube is connected to two drive connecting plates, and a drive shaft is rotatably connected between the drive connecting plates. One end of the drive shaft is connected to a drive tube, and the other end of the drive tube is connected to the motor output end. Between the two drive connecting plates, a gear is connected on the drive shaft, and the gear meshes with the rack at the bottom of the rack rod.

5. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 1, characterized in that, The top surfaces of the extension rod and the support tube are provided with a plurality of first positioning holes, and the first positioning holes of the extension rod coincide with the vertical projection of the limiting holes; the head end of the brake plate abuts against the tail end of the support tube, and the first positioning holes on the extension rod and the support tube coincide.

6. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 5, characterized in that, The limiting plate is an L-shaped plate, comprising a flat plate and a longitudinal plate that are perpendicular to each other and fixedly connected. A first threaded hole is opened on the flat plate so that the first threaded hole is aligned with the corresponding limiting hole. The flat plate is fixedly connected to the bottom surface of the extension rod with limiting plate bolts.

7. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 6, characterized in that, A reinforcing plate is provided between the flat plate and the longitudinal plate. The reinforcing plate is fixedly connected to the flat plate and the longitudinal plate. Both the flat plate and the reinforcing plate are located on the side of the longitudinal plate facing the front of the vehicle. The reinforcing plate is connected to the side of the flat plate and the longitudinal plate facing the inside of the vehicle. A rubber pad is also fixedly installed on the side of the longitudinal plate facing the rear of the vehicle.

8. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 1, characterized in that, The baffle is a U-shaped baffle, including a horizontal plate, with vertical plates connected vertically to both ends of the horizontal plate. The vertical plates are connected to the side wall of the support tube. The horizontal plate is located at the bottom of the support tube, lower than the bottom surface of the rack and pinion, and higher than the bottom surface of the limiting plate. The baffle hole is installed in conjunction with the second threaded hole on the vertical plate.

9. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 8, characterized in that, Multiple sets of second positioning holes are provided on the side walls of both the support tube and the extension rod. The number of sets of second positioning holes is the same as the number of sets of baffle holes. Second positioning holes are provided between multiple baffle holes in a single set.

10. The blocking and limiting mechanism of a towable RV extension mechanism as described in claim 9, characterized in that, The head end of the brake plate abuts against the tail end of the support tube, and the extension rod coincides with the second positioning hole on the support tube.

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