Double-supporting-leg jack for motor home

Abstract

The utility model provides a double support leg jack for motor home, including connecting main part, two groups of screw rod drive assemblies and two groups of support leg assemblies, the motor of two groups of screw rod drive assemblies is installed in the middle part of movable slot of connecting main part mutually close, and one end of screw rod is connected to the motor, and the other end is rotatably connected with the bearing arranged in the end part of connecting main part, and the other end of screw rod also has the manual rotation part that passes through the bearing and is located in the outside of end part of connecting main part, the screw rod nut can be slidably sleeved in screw rod and is limited in movable slot, the support leg assembly is installed below two groups of screw rod drive assemblies respectively, the support leg assembly includes support leg, support rod and support plate, by this, the motor is located in the movable slot in the middle part of connecting main part, can be protected by the shelter of connecting main part, is not easy to be interfered with by the knock of outside, is not easy to be corroded and aged by the rain and splash, and the manual rotation part can be arranged in cooperation, and the expansion or folding of two support legs can be realized by electric or manual.

Description

Technical Field

[0001] This utility model relates to the technical field of RVs, and in particular to a double-support leg jack for RVs. Background Technology

[0002] A motorhome, also known as a "home on wheels," combines the functions of a "house" and a "vehicle." It is a type of mobile vehicle equipped with the essential facilities for living. When a motorhome is parked or stationary, a jack is an indispensable support device to reduce the swaying sensation when people walk inside.

[0003] A common type of jack is the adjustable electric jack bracket for RVs disclosed in Chinese patent CN 117263065 A. It can be electrically adjusted, but this jack has a single-leg X-shaped structure. An RV needs to install two or four outriggers, and when raising or lowering the outriggers, it is necessary to go to two different positions to lift them. Moreover, it does not have its own motor and requires the use of an external motor or manual lifting, which is inconvenient to use.

[0004] Therefore, there is a novel double-support leg jack for RVs disclosed in Chinese patent CN207142725U, which can electrically drive the two support legs to raise and lower, saving effort; however, this solution uses a single motor control and cannot raise and lower the two support legs independently. Another example is a double-support leg jack disclosed in Chinese patent CN 207142731U, which has two motors controlling the support legs separately, increasing load-bearing capacity. However, in this solution, the motors are installed externally, making them susceptible to impacts, rust, corrosion, and aging. Furthermore, this solution only allows for electric control of the support leg raising and lowering and cannot be manually adjusted; when the motor is damaged or lacks power, the support legs cannot be raised or lowered. Utility Model Content

[0005] The purpose of this utility model is to provide a double support leg jack for RVs, which has the advantages of being reliable, durable and supporting both electric and manual adjustment.

[0006] To achieve the above objectives, the solution of this utility model is:

[0007] A double-support leg jack for RVs includes a connecting body, two sets of screw drive assemblies, and two sets of support leg assemblies; the bottom of the connecting body forms a movable groove, and two sets of screw drive assemblies are symmetrically installed in the movable groove.

[0008] The lead screw drive assembly includes a motor, a lead screw, and a lead screw nut; the motors of the two sets of lead screw drive assemblies are installed close to each other in the middle of the movable groove, one end of the lead screw is connected to the motor, and the other end is rotatably connected to a bearing provided at the end of the main body. The other end of the lead screw also has a manual rotating part that passes through the bearing and is located outside the end of the connecting body; the lead screw nut is slidably fitted onto the lead screw and confined within the movable groove.

[0009] The support leg assemblies are respectively installed below the two sets of lead screw drive assemblies, and the two sets of support leg assemblies are also arranged symmetrically from left to right;

[0010] The support leg assembly includes a support leg, a support rod, and a support plate; the upper end of the support leg is hinged to a lead screw nut, the lower end of the support leg is hinged to the middle of the top surface of the support plate, and the two ends of the support rod are respectively hinged to the middle of the support leg and the end of the connecting body.

[0011] Furthermore, the connecting body is a modular assembly structure consisting of multiple segments connected in sequence.

[0012] Furthermore, the connecting body is composed of three C-shaped steel sections connected in sequence; the sides of the left and right ends of the connecting body are used to provide mounting plates with through holes.

[0013] Furthermore, the top of the left and right ends of the connecting body is provided with connecting pieces for connecting to the RV.

[0014] Furthermore, the two side walls of the movable groove of the connecting body are respectively formed into limiting grooves, and the front and rear ends of the lead screw nut are respectively cylindrical sliding parts, which slide into the corresponding limiting grooves.

[0015] Furthermore, the support rod includes two sub-rods distributed front and rear; each sub-rod is rotatably connected to the side wall of the connecting body and the side wall of the support leg by bolts and nuts at both ends.

[0016] Furthermore, the motor and the lead screw are connected by a coupling.

[0017] Furthermore, the lead screw has a 29° double-track trapezoidal thread profile.

[0018] Furthermore, the lead screw has a pitch of 2.54 mm; the lead screw has at least 6 teeth that mesh with the lead screw nut.

[0019] With the above technical solution, the connecting body can be pre-connected and fixed to the front or rear of the RV chassis. The connecting body has two support leg assemblies, which are driven and controlled by two sets of screw drive assemblies. This allows for electric lifting and lowering of the support legs inside the vehicle, saving manpower and improving lifting efficiency. The motor drives the screw to rotate, and the screw rotation causes the screw nut to slide back and forth along the screw in the movable groove. When the screw nut slides, it drives the support leg to move. When the support leg moves, the support rod moves accordingly, thereby controlling the extension and retraction of the support leg. The extended support leg, support rod and connecting body can form a stable triangular structure, thereby ensuring the lifting and support effect of the jack on the RV. The support plate can abut against the bottom surface to increase the contact area and ensure that the RV can stay in place stably and reliably.

[0020] Meanwhile, the motors of both sets of lead screw drive components are located in the movable slots in the middle of the connecting body. They are protected by the connecting body and are not easily affected by external impacts or rain, thus preventing corrosion and aging and extending their service life. Because the two motors are located internally, manual rotating parts can be installed at the bearing positions on the left and right ends of the connecting body for each lead screw. This allows for manual control of the lead screws. In case of motor failure or insufficient power, the two manual rotating parts can be easily rotated using tools to rotate the lead screws, thereby enabling the two support legs to extend or retract. Attached Figure Description

[0021] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0022] Figure 2 This is another perspective view of an embodiment of the present utility model;

[0023] Figure 3 This is an exploded view of an embodiment of the present utility model;

[0024] Figure 4 This is a cross-sectional view of an embodiment of the present utility model;

[0025] Figure 5 for Figure 4 Enlarged view of point A.

[0026] Labeling Explanation: Jack 10, Connecting Body 1, C-shaped Steel 11, Movable Slot 12, Bearing 13, Limiting Slot 14, Mounting Plate 15, Through Hole 151, Connecting Plate 16, Connecting Part 161, Connecting Hole 162, Screw 17, Lead Screw Drive Assembly 2, Motor 21, Lead Screw 22, Manual Rotating Part 221, Gear 222, Lead Screw Nut 23, Lead Screw Hole 231, Sliding Joint 232, Coupling 24, Support Leg Assembly 3, Support Leg 31, Support Rod 32, Sub-rod 321, Bolt 322, Nut 323, Support Plate 33. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] like Figures 1 to 4 As shown, a RV double support leg jack 10 according to this embodiment includes a connecting body 1, two sets of lead screw drive assemblies 2 and two sets of support leg assemblies 3.

[0029] The connecting body 1 can be a single integrated structure or a modular assembly structure consisting of multiple segments connected sequentially. In this embodiment, the connecting body 1 is composed of three C-shaped steel sections 11 connected sequentially, which facilitates segmented transportation and packaging, reducing transportation costs. Of course, it can also be two or four sections, etc., but three sections are preferred.

[0030] The bottom of the connecting body 1 forms a movable groove 12, and two sets of lead screw drive assemblies 2 are symmetrically installed in the movable groove 12.

[0031] The lead screw drive assembly 2 includes a motor 21, a lead screw 22, and a lead screw nut 23; the motors 21 of the two sets of lead screw drive assemblies 2 are installed close to each other in the middle of the movable groove 12, one end of the lead screw 22 is connected to the motor 21, and the other end is rotatably connected to the bearing 13 provided at the end of the main body 1. The other end of the lead screw 22 also has a manual rotating part 221 that passes through the bearing 13 and is located outside the end of the connecting main body 1; the lead screw nut 23 is slidably fitted on the lead screw 22 and confined within the movable groove 12.

[0032] The support leg assembly 3 is installed below the two sets of lead screw drive assemblies 2 respectively, and the two sets of support leg assemblies 3 can also be arranged symmetrically from left to right.

[0033] The support leg assembly 3 includes a support leg 31, a support rod 32, and a support plate 33; the upper end of the support leg 31 is hinged to the lead screw nut 23, the lower end of the support leg 31 is hinged to the middle of the top surface of the support plate 33, and the two ends of the support rod 32 are respectively hinged to the middle of the support leg 31 and the end of the connecting body 1.

[0034] Therefore, the connecting body 1 of this embodiment can be pre-connected and fixed to the front or rear of the RV chassis. The connecting body 1 has two support leg assemblies 3, which are driven and controlled by two sets of lead screw drive assemblies 2 respectively. Thus, the support legs 31 can be independently and electrically raised and lowered by a control switch inside the vehicle, which can save manpower and improve the lifting efficiency. Specifically, the motor 21 drives the lead screw 22 to rotate. The rotation of the lead screw 22 causes the lead screw nut 23 to slide back and forth along the lead screw 22 in the movable groove 12. When the lead screw nut 23 slides, it drives the support leg 31 to move. When the support leg 31 moves, the support rod 32 moves accordingly, thereby controlling the support leg 31 to unfold or retract. The unfolded support leg 31, support rod 32 and connecting body 1 can form a stable triangular structure, thereby ensuring the lifting and support effect of the jack 10 on the RV. The support plate 33 can abut against the ground to increase the contact area and ensure that the RV is lifted stably and reliably.

[0035] Meanwhile, the motors 21 of both sets of lead screw drive components 2 are located in the middle of the movable groove 12 in the middle of the connecting body 1. They can be protected by the connecting body 1, are not easily affected by external bumps and interference, and are not easily corroded and aged by rain and water splashes, thus having a long service life.

[0036] Since the two motors 21 are located internally, manual rotating parts 221 can be provided at the positions where the two lead screws 22 extend from the bearings 13 at the left and right ends of the main body 1, respectively. This allows the lead screws 22 to have a manual control function. When the motors 21 malfunction or the power is insufficient, the two manual rotating parts 221 can be easily rotated with a tool to manually rotate the lead screws 22, thereby enabling the two support legs 31 to unfold or retract. In this embodiment, the manual rotating part 221 can be in the shape of an external hexagonal nut.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the two side walls of the movable groove 12 of the C-shaped steel 11 of the connecting body 1 respectively form limiting grooves 14 for the front and rear ends of the limiting screw nut 23. The screw nut 23 can adopt a cylindrical structure. The middle part of the screw nut 23 is the screw hole 231. The front and rear ends of the screw nut 23 respectively have cylindrical sliding parts 232. The sliding parts 232 slide in the corresponding limiting grooves 14. Through the arc surface sliding, the contact area is small, which can reduce the friction of the screw nut 23 sliding and improve the lifting force.

[0038] Mounting plates 15 can be provided on the sides of the left and right ends of the connecting body 1. The mounting plates 15 have through holes 151 in the middle for the lead screw 22 to pass through. Connecting plates 16 can be provided on the top of the left and right ends of the connecting body 1. The front and rear ends of the connecting plates 16 extend out of the connecting body 1 to form connecting parts 161. Connecting holes 162 are provided on the connecting parts 161 to facilitate locking and fixing with areas such as the RV chassis.

[0039] Both the mounting plate 15 and the connecting plate 16 can be welded and fixed to the connecting body 1, and the three C-shaped steel sections 11 of the connecting body 1 can be locked and fixed by screws 17.

[0040] like Figure 3 As shown, the support rod 32 in this embodiment includes two sub-rods 321 distributed in the front and rear, which can improve structural stability, make the operation smoother, and increase the lifting force. The two ends of each sub-rod 321 can be rotatably connected to the side wall of the connecting body 1 and the side wall of the support leg 31 by bolts 322 and nuts 323 respectively, which can facilitate packaging and transportation while ensuring support strength.

[0041] In this embodiment, the motor 21 and the lead screw 22 are connected by a coupling 24. When the support leg 31 supports the RV, the RV and the people walking inside it have a reaction force on the support leg and the connected lead screw 22. By setting the coupling 24, the effect of shock absorption and vibration damping can be achieved, which can reduce the impact on the motor 21 when people walk and improve the service life of the motor 21.

[0042] like Figure 4 and Figure 5 As shown, this embodiment uses a transmission mechanism with a double-track trapezoidal lead screw 22 and lead screw nut 23 with a thread profile of 29°, which has low cost and self-locking function.

[0043] In practice, the screw 22 of a conventional RV jack 10 has a pitch of 3.175 mm. However, this jack 10 has a risk of reverse descent during actual use, which can cause the RV to become unstable and prone to sinking and swaying. Therefore, in this embodiment, the screw 22 is redesigned with a pitch of 2.54 mm. This increases the number of teeth engaged between the screw 22 and the screw nut 23 while maintaining the same screw nut 23 size. In this embodiment, the screw 22 has 6 teeth 222 that engage with the screw nut 23 (see [reference]). Figure 5 This can increase the friction between the lead screw 22 and the lead screw nut 23, preventing the RV from sinking and shaking due to the lead screw nut 23 reversing and retracting. Depending on actual needs, the lead screw 22 can also be configured to have 8 teeth 222 meshing with the lead screw nut 23 to further increase the friction.

[0044] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of this utility model should still fall within the protection scope of this utility model.

[0045] In the description of the embodiments of this application, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships commonly used when the product is in use, or the orientations or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise explicitly specified.

Claims

1. A double-support leg jack for RVs, comprising a connecting body, two sets of lead screw drive assemblies, and two sets of support leg assemblies; characterized in that: The bottom of the connecting body forms a movable groove, and two sets of lead screw drive components are symmetrically installed in the movable groove. The lead screw drive assembly includes a motor, a lead screw, and a lead screw nut; the motors of the two sets of lead screw drive assemblies are installed close to each other in the middle of the movable groove, one end of the lead screw is connected to the motor, and the other end is rotatably connected to a bearing provided at the end of the main body. The other end of the lead screw also has a manual rotating part that passes through the bearing and is located outside the end of the connecting body; the lead screw nut is slidably fitted onto the lead screw and confined within the movable groove. The support leg assemblies are respectively installed below the two sets of lead screw drive assemblies, and the two sets of support leg assemblies are also arranged symmetrically from left to right; The support leg assembly includes a support leg, a support rod, and a support plate; the upper end of the support leg is hinged to a lead screw nut, the lower end of the support leg is hinged to the middle of the top surface of the support plate, and the two ends of the support rod are respectively hinged to the middle of the support leg and the end of the connecting body.

2. The RV double-support leg jack according to claim 1, characterized in that: The connecting body is a modular assembly structure consisting of multiple segments connected sequentially.

3. The RV double-support leg jack according to claim 2, characterized in that: The connecting body is composed of three C-shaped steel sections connected in sequence; the sides of the left and right ends of the connecting body are used to set mounting plates with through holes.

4. The RV double-support leg jack according to claim 1, characterized in that: The top left and right ends of the connecting body are provided with connecting pieces for connecting to the RV.

5. A double-support leg jack for RVs according to claim 1, characterized in that: The two side walls of the movable groove of the connecting body form limiting grooves respectively, and the front and rear ends of the lead screw nut have cylindrical sliding parts, which slide into the corresponding limiting grooves respectively.

6. A double-support leg jack for RVs according to claim 1, characterized in that: The support rod includes two sub-rods distributed front and rear; each sub-rod is rotatably connected to the side wall of the main body and the side wall of the support leg by bolts and nuts at both ends.

7. A double-support leg jack for RVs according to claim 1, characterized in that: The motor and the lead screw are connected by a coupling.

8. A double-support leg jack for RVs according to claim 1, characterized in that: The lead screw has a 29° double-track trapezoidal thread profile.

9. A double-support leg jack for RVs according to claim 8, characterized in that: The lead screw has a pitch of 2.54 mm; the lead screw has at least 6 teeth that mesh with the lead screw nut.

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