Trailer jack connecting seat

Abstract

The invention relates to the field of trailer jacks, in particular to a trailer jack connecting seat which comprises a fixing plate, a rotating shaft rotatably mounted on the fixing plate, a torsion spring connected between the fixing plate and the rotating shaft, a positioning sleeve fixedly connected to the fixing plate and used for supporting the rotating shaft, and a limiting pin inserted into the rotating shaft and the positioning sleeve. The torsion spring is installed on the trailer jack connecting seat and can rotate along with the rotating shaft and the trailer jack, and in the process of releasing the trailer jack, the torsion spring converts gravitational potential energy of the trailer jack into elastic potential energy, so that the rotating speed of the trailer jack is slowed down, the impulse is reduced, and the safety risk of collision is avoided; in the process of retracting the trailer jack, the torsion spring converts the elastic potential energy into the gravitational potential energy of the trailer jack, the situation that a user does work by overcoming the gravity of the trailer jack is reduced, more labor is saved when the user retracts the trailer jack, and the experience is good.

Description

Technical Field

[0001] The invention relates to the field of trailer jacks, in particular to a trailer jack connecting seat. Background Art

[0002] A trailer jack is a device used to lift and support a trailer. When the trailer is separated from the tractor, it is vertically supported between the trailer frame and the ground to maintain the parking stability of the trailer. After the trailer is connected to the tractor, the trailer jack needs to be retracted to avoid touching the ground while driving.

[0003] At present, a Chinese patent application with publication number CN206156670U and publication date May 10, 2017 proposes a trailer jack, which is installed on the frame of the trailer through a connecting seat. The existing connecting seat includes a fixed plate and a rotating plate with a through hole in the middle. The fixed plate is connected to the frame, and the rotating plate is arranged on the trailer jack. The bolts pass through the fixed plate and the rotating plate through the through holes and are pre-tightened with nuts.

[0004] When in use, the fixed plate and the rotating plate are connected by bolts and can rotate relative to each other, and pin holes are provided on the fixed plate and the rotating plate, and the rotating plate is limited in the rotation direction by the cooperation of the pin and the pin hole; the trailer jack rotates around the bolts and cooperates with the pin to realize the switching between the vertical support state and the horizontal retracted state.

[0005] With regard to the above-mentioned related technologies, in the process of manually retracting and extending the trailer jack, the user needs to control the lower end of the trailer jack with one hand and adjust the rotation angle so that the pin holes correspond, and insert the pin with the other hand to complete the locking. In order to ensure the structural strength of the trailer jack, the material used is thick, and it is equipped with many accessories, and its own weight is large. It is extremely laborious to manually retract it, which affects the user experience; and the impulse is large when it is manually released, and there is a safety hazard of collision. Summary of the invention

[0006] In order to save effort when folding a trailer jack and slow down the speed when releasing it, thereby improving the user experience and increasing the safety of use, the present invention provides a trailer jack connecting seat.

[0007] The present invention provides a trailer jack connecting seat, which adopts the following technical solution: A trailer jack connection seat comprises: a fixed plate, a rotating shaft, a limiting pin and a positioning sleeve, wherein one end of the positioning sleeve is fixedly connected to the fixed plate, one end of the rotating shaft is rotatably mounted on the fixed plate, and the rotating shaft is rotatably mounted inside the positioning sleeve, the rotating shaft and the positioning sleeve are coaxially arranged, and the limiting pin is inserted into the rotating shaft and the positioning sleeve. The rotating shaft includes a supporting portion, a limiting portion arranged at one end of the supporting portion, and a connecting portion arranged at the other end of the limiting portion, one end of the supporting portion and the fixing plate are rotatably connected via a rotating supporting assembly, the limiting portion is coaxially inserted into the positioning sleeve, and the connecting portion is used to connect the trailer jack; A torsion spring is sleeved on the outer side of the support portion, one end of the torsion spring is fixedly connected to the fixing plate, and the other end is fixedly connected to the limiting portion; The limiting portion is provided with two pin holes along the radial direction, the two pin holes are vertically arranged, the positioning sleeve is provided with a first locking hole, and the two pin holes can be matched with the first locking hole through the limiting pin.

[0008] By adopting the above technical solution, the connecting part of the rotating shaft is connected to the trailer jack, and the fixing plate is fixedly connected to the trailer. When the trailer jack is supported, the limit pin is firstly taken out from the corresponding pin hole and the first locking hole, and then the trailer jack is rotated to a vertical state, at which time the rotating shaft rotates together with the trailer jack, and finally the limit pin is inserted into the corresponding pin hole and the first locking hole to lock the trailer jack and the rotating shaft; when the trailer jack is folded, the limit pin is firstly taken out from the corresponding pin hole and the first locking hole, and then the trailer jack is rotated to a horizontal folded state, at which time the rotating shaft rotates together with the trailer jack, and finally the limit pin is inserted into the corresponding pin hole and the first locking hole again to lock the trailer jack in a horizontal folded state. When the rotating shaft rotates, the positioning sleeve supports the rotating shaft outside the limit part and axially limits the rotating shaft. In this way, when the torsion spring rotates the trailer jack to a vertical support state along with the rotating shaft, the gravity of the trailer jack will twist the torsion spring, and the gravitational potential energy of the trailer jack is converted into elastic potential energy of the torsion spring, thereby slowing down the rotation speed of the trailer jack and reducing the risk of the trailer jack colliding with the ground or the user; when the torsion spring rotates the trailer jack to a horizontal stowed state along with the rotating shaft, the elastic potential energy of the torsion spring will be converted into gravitational potential energy of the trailer jack, thereby reducing the work done by the user to overcome gravity when rotating the trailer jack to the horizontal stowed state, making it easier to store the trailer jack and improving the user experience.

[0009] Optionally, the fixed plate is provided with a plurality of first limiting holes arranged around the axis of the rotating shaft; the end surface of the limiting portion facing the supporting portion is provided with a plurality of second limiting holes, and the plurality of second limiting holes are arranged around the axis of the rotating shaft; one end of the torsion spring is connected to the first limiting hole, and the other end is connected to the second limiting hole.

[0010] By adopting the above technical solution, when one end of the torsion spring is installed in the first limiting hole at different positions in the fixing plate or the other end of the torsion spring is installed in the second limiting hole at different positions in the limiting part, the torsion spring can be set to different torsion angles, and different preload forces can be applied to the torsion spring, or the torsion angle of the torsion spring can be adjusted, so that torsion springs of different models and different torsion angles can be applied in this application. The first limiting hole and the second limiting hole arranged in such a circular pattern enable torsion springs of different hardness to flexibly set the torsion angle according to trailer jacks of different qualities, thereby increasing the universality of the torsion spring.

[0011] Optionally, a limiting opening is formed at one end of the positioning sleeve away from the fixing plate, and a limiting block is provided on the limiting portion, and the limiting block cooperates with the limiting opening.

[0012] By adopting the above technical solution, when the trailer jack rotates, the limit block will rotate with the rotating shaft. When the limit block rotates to the end of one side of the limit opening, the trailer jack is in a vertical support state, and at this time, one of the pin holes corresponds to the first locking hole; when the limit block rotates to the end of the other side of the limit opening, the trailer jack is in a horizontal retracted state, and at this time, the other pin hole corresponds to the first locking hole. When the trailer jack is retracted or supported in this way, it is only necessary to rotate the trailer jack and drive the limit block to slide to one end of the limit opening to quickly align the pin hole and the first locking hole, and insert the limit pin into the aligned pin hole and the first locking hole to achieve the locking of the trailer jack in the horizontal retracted state or the vertical support state; the setting of the limit opening and the limit block limits the rotation stroke of the rotating shaft, which is convenient for quickly aligning the pin hole and the first locking hole and locking with the limit pin, and the operation is convenient and the retracting efficiency is high.

[0013] Optionally, the rotation support assembly includes a support sleeve, a shaft sleeve and two bearings, one end of the support sleeve is fixedly connected to the fixed plate, the support sleeve is arranged between the rotating shaft and the torsion spring, and the support sleeve and the rotating shaft are coaxially arranged, the two bearings are respectively installed at both ends of the support sleeve, the shaft sleeve is sleeved on the rotation support part and is located between the inner rings of the two bearings, and the support part is rotatably supported inside the support sleeve through the two bearings.

[0014] By adopting the above technical solution, when the rotating shaft rotates inside the positioning sleeve, the two ends of the support sleeve will support the support part of the rotating shaft at both ends of the rotating shaft support part, and the two bearings can reduce friction when the support sleeve supports the support part, and the sleeve can limit the position of the two bearings, so that the bearings can stably support the support part at both ends of the support sleeve. In this way, the support sleeve and the bearings can further support the rotating shaft, thereby increasing the stability of the rotating shaft supporting the trailer jack.

[0015] Optionally, the inner rings of the two bearings are fixedly connected via the bushing, the nut and the rotating shaft.

[0016] By adopting the above technical solution, the inner ring of the rotating shaft and the bearing are fixedly connected together using nuts and sleeves, so that when replacing the rotating shaft and the torsion spring arranged inside the positioning sleeve, the nut can be removed and then the rotating shaft and the torsion spring can be replaced, thereby increasing the convenience of repairing the internal structure of the trailer jack connecting seat; the provision of flat washers and spring washers can effectively reduce the probability of nut loosening and increase the stability of the rotating connection between the rotating shaft and the bearing.

[0017] Optionally, a plurality of extension blocks are arranged around one end of the positioning sleeve, a plurality of through holes are arranged on the fixing plate corresponding to the plurality of extension blocks, and the extension blocks are fixedly arranged in the through holes in a one-to-one correspondence.

[0018] By adopting the above technical solution, fixing multiple extension blocks one by one in the through holes on the fixed plate can increase the contact area between the positioning sleeve and the fixed plate, thereby improving the connection strength between the positioning sleeve and the fixed plate and enhancing the load-bearing capacity of the connecting seat.

[0019] Optionally, it also includes a rotating plate and a rotating sleeve, the rotating plate is used to connect to the trailer jack, the rotating sleeve is fixedly arranged on the rotating plate, the rotating sleeve is sleeved on the outer circumferential surface of the positioning sleeve, the rotating sleeve is provided with a second locking hole, the rotating sleeve is provided with two groups of second locking holes arranged one by one corresponding to the pin holes, and the rotating sleeve is also provided with a positioning hole for cooperating with the connecting part.

[0020] By adopting the above technical solution, when there is no structure for connecting with the connecting part on some trailer jacks, a rotating plate is used to connect with the trailer jack, and a rotating sleeve is sleeved on the outer peripheral surface of the positioning sleeve. After the positioning hole in the rotating sleeve is connected with the connecting part of the rotating shaft, the rotating sleeve can realize the synchronous rotation of the rotating sleeve and the rotating shaft through the cooperation of the positioning hole and the connecting part. When the trailer jack is rotated to the horizontal stowed position or the vertical support position, the limit pin is inserted into the second locking hole, the first locking hole and the pin hole corresponding to the pin hole to realize the synchronous locking of the rotating sleeve and the trailer jack. The setting of the rotating plate and the rotating sleeve provides a new connection method for the trailer jack connecting seat and the trailer jack, thereby increasing the applicability of the trailer jack connecting seat; the setting of the rotating sleeve enables the connecting seat to support the rotating plate at the same time inside and outside the positioning sleeve, thereby increasing the stability of the support for the trailer jack.

[0021] Optionally, the cross-sections of the connecting portion and the positioning hole are both rectangular.

[0022] In summary, the present invention includes at least one of the following beneficial technical effects: By installing a torsion spring on the trailer jack connection seat, one end of the torsion spring is fixed on the fixed plate, and the other end is fixed on the rotating shaft. As the rotating shaft and the trailer jack rotate, during the process of releasing the trailer jack, the torsion spring converts the gravity potential energy of the trailer jack into elastic potential energy, so that the rotation speed of the trailer jack is slowed down and the impulse is reduced, avoiding the safety risk of collision; during the process of retracting the trailer jack, the torsion spring converts the elastic potential energy into the gravity potential energy of the trailer jack, reducing the user's work to overcome the gravity of the trailer jack, and it is more labor-saving and has a better experience when retracting the trailer jack. Compared with the existing connection seat that needs to remove the bolts or even cannot be separated, the present application can separate the fixed plate from the trailer jack by pulling out the limit pin, which provides convenience for maintenance and replacement.

[0023] A limit opening is arranged on the positioning sleeve, and a limit block is arranged on the rotating shaft. When the rotating shaft rotates in the positioning sleeve, the limit block slides in the limit opening. The limit opening and the limit block cooperate to limit the extreme position of the rotating stroke of the rotating shaft, thereby realizing rapid alignment of the first locking hole and the pin hole, facilitating the insertion of the limit pin, making the locking operation of the trailer jack more convenient and the retracting and releasing efficiency high.

[0024] The rotating shaft is supported by two forms of a positioning sleeve and a rotating support assembly, thereby increasing the stability when the rotating shaft is connected to the trailer jack and increasing the load-bearing capacity of the trailer jack connection seat.

[0025] By setting a rotating plate and a rotating sleeve, a new connection method is provided for the trailer jack connecting seat and the trailer jack in the present application, so that the trailer jack connecting seat in the present application can adapt to more types of trailer jacks, thereby increasing the use scenarios of the trailer jack connecting seat in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a supporting state of an embodiment of the present invention; Figure 2 is a schematic diagram of a stowed state of an embodiment of the present invention; Figure 3 is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 4 is a schematic diagram of a rotating shaft supporting state according to an embodiment of the present invention; Figure 5 is a schematic diagram of a rotating shaft in a retracted state according to an embodiment of the present invention; Figure 6 is a schematic diagram of the back structure of a fixing plate according to an embodiment of the present invention; Figure 7 is a schematic cross-sectional view of the internal structure of the rotating shaft according to an embodiment of the present invention; Figure 8 is a schematic diagram of the installation position of the torsion spring according to an embodiment of the present invention; Fig. 9 It is a schematic diagram of the overall structure of a positioning sleeve according to an embodiment of the present invention.

[0027] Description of reference numerals: 100, fixing plate; 110, connecting hole; 120, first limiting hole; 130, through hole; 200, rotating shaft; 210, supporting part; 220, limiting part; 221, second limiting hole; 222, pin hole; 223, limiting block; 230, connecting part; 240, rotating support assembly; 241, supporting sleeve; 242, bearing; 243, bushing; 244, flat washer ; 245, spring washer; 246, nut; 300, torsion spring; 400, limit pin; 500, positioning sleeve; 510, extension block; 520, first locking hole; 530, limit opening; 600, rotating plate; 610, rotating through hole; 700, rotating sleeve; 710, second locking hole; 720, terminal plate; 721, positioning hole; 800, trailer jack; 900, connecting seat. DETAILED DESCRIPTION

[0028] The following combination Figures 1 to 9 The present invention is described in further detail.

[0029] The embodiment of the present invention discloses a trailer jack connection seat. Figures 1 to 3, A trailer jack connecting seat, comprising a fixing plate 100, a rotating shaft 200 rotatably mounted on the fixing plate 100, a torsion spring 300 connected between the fixing plate 100 and the rotating shaft 200, a positioning sleeve 500 fixedly connected to the fixing plate 100 and used for supporting the rotating shaft 200, and a limit pin 400 inserted on the rotating shaft 200 and the positioning sleeve 500. When in use, the fixing plate 100 is connected to the vehicle frame, one end of the rotating shaft 200 is rotatably connected to the fixing plate 100, the other end of the rotating shaft 200 is connected to the trailer jack 800, and the trailer jack 800 rotates in the vertical direction along with the rotating shaft 200. At the same time, the rotating shaft 200 and the positioning sleeve 500 are fixed by using the limit pin 400. When the trailer jack 800 rotates to the horizontal state along with the rotating shaft 200, the trailer jack 800 is in the retracted state. When the trailer jack 800 rotates to the vertical state along with the rotating shaft 200, the trailer jack 800 is in the supporting state. During the rotation of the trailer jack 800 along with the rotating shaft 200, the elastic potential energy of the torsion spring 300 and the gravitational potential energy of the trailer jack 800 are mutually converted, thereby slowing down the rotation speed of the trailer jack 800, reducing the rotation impulse, and improving safety and use convenience.

[0030] Refer to Figures 4 to 6 , The fixing plate 100 is fixed on the vehicle frame of the trailer. The fixing plate 100 is provided with a plurality of connection holes 110 for bolt connection. The cross-section of the fixing plate 100 is in a "several" shape. The recessed position in the middle of the fixing plate 100 leaves an assembly space for the axial end limit of the rotating shaft 200, and at the same time, the structural strength is improved by increasing the folded edge.

[0031] Refer to Figure 7 , The rotating shaft 200 is provided with a support portion 210, a limit portion 220, and a connection portion 230. Both the support portion 210 and the limit portion 220 are in a cylindrical shape, and the support portion 210 and the connection portion 230 are respectively arranged on two opposite end faces of the limit portion 220. The support portion 210 is used for connecting with the fixing plate 100, the limit portion 220 is used for circumferentially limiting the rotating shaft 200, and the connection portion 230 of the rotating shaft 200 is used for connecting the trailer jack 800.

[0032] Refer to Figures 5 to 7The support portion 210 of the rotating shaft 200 is rotatably connected to the fixed plate 100 via the rotating support assembly 240. The rotating support assembly 240 includes a supporting sleeve 241 and a bearing 242. One end of the supporting sleeve 241 is welded to the fixed plate 100. The support portion 210 of the rotating shaft 200 is coaxially arranged in the supporting sleeve 241. The bearing 242 is supported between the rotating shaft 200 and the supporting sleeve 241. The bearing 242 is a deep groove ball bearing 242. The bearing 242 is provided with two , and two bearings 242 are respectively mounted at both ends of the support sleeve 241, the inner ring of the bearing 242 is assembled on the support portion 210 of the rotating shaft 200, and the outer ring is assembled on the inner surface of the support sleeve 241, and the inner rings of the two bearings 242 are axially spaced and limited by the shaft sleeve 243, wherein the bearing 242 close to the fixed plate 100 is fixedly set between the fixed plate 100 and the limiting structure of the support sleeve 241 through the limiting structure set in the support sleeve 241. The end of the support portion 210 is provided with a thread, and the nut 246 is assembled on the rotating shaft 200 through the thread, and the nut 246 fixes the end of the rotating shaft 200 and the inner ring of the bearing 242 close to the fixed plate 100, and the nut 246 limits the axial position of the bearing 242 through the spring washer 245 and the flat washer 244.

[0033] Reference Figure 6 A plurality of first limiting holes 120 are axially opened on the fixed plate 100, and the first limiting holes 120 are arranged in a ring around the rotating shaft 200. A plurality of second limiting holes 221 are axially opened on the limiting portion 220 of the rotating shaft 200, and the second limiting holes 221 are arranged in a ring around the shaft. The torsion spring 300 is sleeved on the outside of the supporting sleeve 241, and one end of the torsion spring 300 is connected to the fixed plate 100 through the first limiting hole 120, and the other end is connected to the rotating shaft 200 through the corresponding second limiting hole 221; the plurality of first limiting holes 120 and second limiting holes 221 are provided for selection when setting the torsion angle of the torsion spring 300.

[0034] Reference Figure 8 The outer side of the torsion spring 300 is sleeved with a positioning sleeve 500, and an extension block 510 is provided in an annular manner at one end of the positioning sleeve 500. A through hole 130 is provided on the fixing plate 100 corresponding to the extension block 510. The extension block 510 of the positioning sleeve 500 is inserted into the corresponding through hole 130 and welded. Compared with directly welding one end of the positioning sleeve 500 to the fixing plate 100 in an annular manner, this solution increases the contact area of ​​the welding between the two and improves the connection strength between the positioning sleeve 500 and the fixing plate 100.

[0035] Reference Figure 7 and Fig. 9The limiting portion 220 of the rotating shaft 200 is radially provided with a pin hole 222, and the positioning sleeve 500 is provided with a first locking hole 520 corresponding to the pin hole 222. The first locking hole 520 is arranged in the vertical direction, and the limiting pin 400 penetrates the first locking hole 520 and the pin hole 222 to limit the rotation of the rotating shaft 200; one pin hole 222 is arranged in the horizontal direction and one pin hole 222 in the vertical direction respectively. The first locking hole 520 cooperates with the pin hole 222 in the horizontal direction and the pin hole 222 in the vertical direction respectively to realize the locking of the rotating shaft 200 in two states.

[0036] Reference Figure 3 The present application also includes a rotating plate 600 and a rotating sleeve 700, wherein the rotating plate 600 is assembled on the trailer jack 800, and a rotating through hole 610 is provided on the rotating plate 600. One end of the rotating sleeve 700 is welded to the rotating plate 600 through the rotating through hole 610, and the other end is sleeved on the outside of the positioning sleeve 500. Two pairs of second locking holes 710 are provided on the rotating sleeve 700 corresponding to the pin holes 222; a terminal plate 720 is provided at the end of the rotating sleeve 700, and a positioning hole 721 is provided on the terminal plate 720 to cooperate with the connecting portion 230 of the rotating shaft 200.

[0037] Specifically, the connection part 230 in this embodiment is in the shape of a rectangular parallelepiped, which is used to cooperate with the rectangular positioning hole 721 preset on the trailer jack 800 to prevent the trailer jack 800 and the connecting seat 900 from being in the wrong direction during installation, and the connection part 230 can be used to transmit torque by cooperating with the positioning hole 721. In other embodiments, the cross-sectional shape of the connection part 230 and the positioning hole 721 can also be a polygon, an ellipse, or other cross-sectional shapes that can transmit torque.

[0038] When in use, the rotating plate 600 and the rotating sleeve 700 rotate synchronously with the rotating shaft 200, and the limit pin 400 penetrates the first locking hole 520 and the second locking hole 710 to achieve position locking; specifically, the first locking hole 520, the pin hole 222 and the second locking hole 710 are all through holes, and from the appearance, the first locking hole 520 appears to be a pair of two, and always maintains a vertical setting, and the second locking holes 710 are two pairs, that is, four holes are evenly distributed circumferentially, when the trailer jack 800 maintains a horizontally retracted state, the limit pin 400 needs to penetrate the first locking hole 520, a pair of second locking holes 710 and a pair of pin holes 222 to complete the locking; when the trailer jack 800 maintains a vertical support state, the limit pin 400 needs to penetrate the first locking hole 520, another pair of second locking holes 710 and another pair of pin holes 222 to complete the locking.

[0039] Reference Figure 4 and Figure 5A limiting opening 530 is provided on one end of the positioning sleeve 500 away from the fixing plate 100 , and a limiting block 223 is radially provided on the limiting portion 220 of the rotating shaft 200 . The limiting block 223 slides in the limiting opening 530 as the rotating shaft 200 rotates.

[0040] The implementation principle of a trailer jack connection seat according to an embodiment of the present invention is as follows: when the trailer jack connection seat is in use, the fixing plate 100 is first fixed to the frame of the trailer, and then the trailer jack 800 is connected to the connecting portion 230 of the rotating shaft 200. When the trailer is separated from the tractor, the limit pin 400 is pulled out, the rotating shaft 200 releases the rotation lock, and the trailer jack 800 drives the rotating shaft 200 to rotate under the support of the rotating support assembly 240 by its own gravity until the limit block 223 slides to the lower end in the limit opening 530, and the limit opening 530 limits the sliding of the limit block 223, thereby limiting the rotating shaft 200 from continuing to rotate. At this time, the pin hole 222 and the first locking hole 52 0, the second locking hole 710 is aligned, the limit pin 400 is inserted into the first locking hole 520, the second locking hole 710, and the pin hole 222 to complete the locking, at this time the trailer jack 800 is in a vertical support state; when the trailer jack 800 needs to be folded up, the limit pin 400 is pulled out, the trailer jack 800 is rotated, and the rotating shaft 200 is driven to rotate until the limit block 223 slides to the upper end in the limit opening 530, at this time the pin hole 222 is aligned with the first locking hole 520 and the second locking hole 710, the limit pin 400 is inserted into the first locking hole 520, the second locking hole 710, and the pin hole 222 to complete the locking, at this time the trailer jack 800 is in a horizontal folded state.

[0041] During the process of releasing the trailer jack 800, the torsion spring 300 converts the gravitational potential energy of the trailer jack 800 into its elastic potential energy, so that the rotation speed of the trailer jack 800 is slowed down and the impulse is reduced, thereby avoiding the safety risk of collision; during the process of retracting the trailer jack 800, the torsion spring 300 converts its elastic potential energy into the gravitational potential energy of the trailer jack 800, which saves users effort and provides a good experience; in addition, the limit position of the rotation stroke of the rotating shaft 200 is limited by the limit block 223, so that the first locking hole 520 and the second locking hole 710 are aligned with the pin hole 222, which facilitates the insertion of the limit pin 400, and the operation is convenient and the retraction and release efficiency is high.

[0042] In summary, the present application adds a torsion spring 300 to the trailer jack connecting seat. When the torsion spring 300 rotates the trailer jack 800 to a vertical support state along with the rotating shaft 200, the gravitational potential energy of the trailer jack 800 is converted into the elastic potential energy of the torsion spring 300, thereby slowing down the rotation speed of the trailer jack 800 and reducing the risk of collision between the trailer jack 800 and the connecting seat 900; when the torsion spring 300 rotates the trailer jack 800 to a horizontal retracted state along with the rotating shaft 200, the elastic potential energy of the torsion spring 300 is converted into the gravitational potential energy of the trailer jack 800, thereby reducing the work to overcome gravity when rotating the trailer jack 800 to a horizontal state, making it easier to store the trailer jack 800 and improving the user experience; the positioning sleeve 500 The limit opening 530 and the limit block 223 provided on the rotating shaft 200 cooperate to limit the extreme position of the rotation stroke of the rotating shaft 200, thereby realizing the rapid alignment of the first locking hole 520, the second locking hole 710 and the pin hole 222, facilitating the insertion of the limit pin 400, making the locking operation of the trailer jack 800 more convenient and the retracting and releasing efficiency high; the rotating shaft 200 is supported in two forms, namely, the positioning sleeve 500 and the rotating support assembly 240, thereby increasing the stability of the rotating shaft 200 when connected to the trailer jack 800, and increasing the load-bearing capacity of the trailer jack 800 connecting seat 900; the rotating plate 600 and the rotating sleeve 700 provided provide a new connection method for the trailer jack connecting seat and the trailer jack 800 in the present application, thereby increasing the applicable scenarios of the trailer jack connecting seat in the present application.

[0043] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A trailer jack connection seat, comprising: A fixed plate (100), a rotating shaft (200), a limiting pin (400) and a positioning sleeve (500), wherein one end of the positioning sleeve (500) is fixedly connected to the fixed plate (100), one end of the rotating shaft (200) is rotatably mounted on the fixed plate (100), and the rotating shaft (200) is rotatably mounted inside the positioning sleeve (500), the rotating shaft (200) and the positioning sleeve (500) are coaxially arranged, and the limiting pin (400) is inserted into the rotating shaft (200) and the positioning sleeve (500), characterized in that: The rotating shaft (200) comprises a supporting portion (210), a limiting portion (220) arranged at one end of the supporting portion (210), and a connecting portion (230) arranged at the other end of the limiting portion (220); the other end of the supporting portion (210) and the fixing plate (100) are rotatably connected via a rotating supporting assembly (240); the limiting portion (220) is coaxially inserted into the positioning sleeve (500); and the connecting portion (230) is used for connecting to a trailer jack; A torsion spring (300) is sleeved on the outside of the support portion (210), one end of the torsion spring (300) is fixedly connected to the fixing plate (100), and the other end is fixedly connected to the limiting portion (220); The limiting portion (220) is provided with two pin holes (222) in a radial direction, the two pin holes (222) are vertically arranged, the positioning sleeve (500) is provided with a first locking hole (520), and the two pin holes (222) can be matched with the first locking hole (520) through a limiting pin (400).

2. The trailer jack connection seat according to claim 1, characterized in that: The fixing plate (100) is provided with a plurality of first limiting holes (120) arranged around the axis of the rotating shaft (200); The end surface of the limiting portion (220) facing the supporting portion (210) is provided with a plurality of second limiting holes (221), and the plurality of second limiting holes (221) are arranged in a circular pattern around the axis of the rotating shaft (200); One end of the torsion spring (300) is connected to the first limiting hole (120), and the other end is connected to the second limiting hole (221).

3. A trailer jack connection seat according to any one of claims 1-2, characterized in that: A limiting opening (530) is provided at one end of the positioning sleeve (500) away from the fixing plate (100), and a limiting block (223) is provided on the limiting portion (220), and the limiting block (223) cooperates with the limiting opening (530).

4. A trailer jack connection seat according to any one of claims 1-2, characterized in that: The rotation support assembly (240) comprises a support sleeve (241), a shaft sleeve (243) and two bearings (242); one end of the support sleeve (241) is fixedly connected to the fixed plate (100); the support sleeve (241) is arranged between the rotating shaft (200) and the torsion spring (300); the support sleeve (241) and the rotating shaft (200) are arranged coaxially; the two bearings (242) are respectively mounted on the two ends of the support sleeve (241); the shaft sleeve (243) is sleeved on the support portion (210) and is located between the inner rings of the two bearings (242); the support portion (210) is rotationally supported inside the support sleeve (241) through the two bearings (242).

5. The trailer jack connection seat according to claim 4, characterized in that: The inner rings of the two bearings (242) are fixedly connected via the shaft sleeve (243), the nut (246) and the rotating shaft (200).

6. A trailer jack connection seat according to any one of claims 1-2, characterized in that: One end of the positioning sleeve (500) is provided with a plurality of extension blocks (510) in a ring pattern, and the fixing plate (100) is provided with a plurality of through holes (130) corresponding to the plurality of extension blocks (510), and the extension blocks (510) are fixedly arranged in the through holes (130) in a one-to-one correspondence.

7. A trailer jack connection seat according to any one of claims 1-2, characterized in that: The invention also comprises a rotating plate (600) and a rotating sleeve (700), wherein the rotating plate (600) is used to be connected to a trailer jack, the rotating sleeve (700) is fixedly arranged on the rotating plate (600), the rotating sleeve (700) is sleeved on the outer peripheral surface of the positioning sleeve (500), the rotating sleeve (700) is provided with two groups of second locking holes (710) arranged in a one-to-one correspondence with the pin holes (222), and the rotating sleeve (700) is also provided with a positioning hole (721) for cooperating with the connecting portion (230) to transmit torque.

8. The trailer jack connection seat according to claim 7, characterized in that: The cross-sections of the connecting portion (230) and the positioning hole (721) are both rectangular.

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