Hand lever limiting device of trailer

Abstract

A matching seat (3) is arranged at the lower end of a hand lever (1), a fixing seat (2) is provided with a matching groove (4) facing the matching seat (3), the matching seat (3) is rotatably connected with the matching groove (4), and a limiting protrusion (5) and a limiting groove (6) are arranged between the matching seat (3) and the matching groove (4), or the matching seat (3) is provided with the matching groove (4) facing the fixing seat (2). The limiting protrusion (5) and the limiting groove (6) can be elastically matched with each other or separated from each other to form a first vertical limiting state and a second traction position state. The hand lever limiting device is beneficial to greatly simplifying the structure and operation.

Description

Technical Field

[0001] The invention relates to the technical field of trailers, in particular to a hand pull rod limiting device for a trailer. Background Art

[0002] For example, in outdoor leisure activities, a small trailer used for carrying objects is a very important tool. For ease of use, a hand lever is usually provided, and a user pulls the small trailer through the hand lever.

[0003] In the prior art, a hand pull rod is usually connected by a spring to realize the gear function. For example, a technical solution disclosed in a marble pull rod mechanism with publication number CN206984094U includes a handle, an upper pull rod, a lower pull rod, a telescopic mechanism, a button, a gear adjustment mechanism and a pull rod seat. The upper end of the upper pull rod is fixedly connected to the handle, and the lower end of the upper pull rod is installed in the lower pull rod through the telescopic mechanism. The lower end of the lower pull rod is installed in the pull rod through the pull rod head. On the rod seat; the telescopic mechanism includes a top rod, a shift fork, a top column and a V-shaped double-headed marble. The top rod is located inside the upper pull rod. The upper end of the top rod is connected to a button. The lower end of the top rod is fixed with a shift fork. The V-shaped double-headed marble is fixed to the bottom of the shift fork from bottom to top through the top column. The two marbles of the V-shaped double-headed marble extend out of the upper pull rod to the left and right sides respectively; the gear adjustment mechanism includes a gear seat, a gear spring and a positioning bolt. The upper part of the pull rod head is fixedly connected to the lower end of the lower pull rod. When the pull rod is rotated, the pull rod head connected to the lower pull rod drives the gear spring inside it and the gear seats at both ends to rotate around the positioning bolts. Since the pull rod seat is fixed on the lower cross beam of the frame and does not rotate, the limiting protrusion on the gear seat enters into different gear grooves on the pull rod head as it rotates, so that the pull rod stays at different rotation positions.

[0004] As can be seen from the above, the structure is relatively complex and the operation is troublesome. The applicant proposes a hand-pull rod limiting device for a trailer, which is conducive to greatly simplifying the structure and operation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a hand pull rod limiting device for a trailer, which is conducive to greatly simplifying the structure and operation.

[0006] In order to solve the above technical problems, the present invention proposes a hand-pulled rod limiting device for a trailer, comprising a hand-pulled rod and a fixed seat connected to the body of the trailer, a matching seat is provided at the lower end of the hand-pulled rod, the fixed seat is provided with a matching groove arranged toward the matching seat, the matching seat and the matching groove are rotatably connected, and a limiting protrusion and a limiting groove are provided between the matching seat and the matching groove, the limiting protrusion is arranged on the bottom surface of the matching groove, the limiting groove is arranged in the circumference of the matching seat, or the limiting groove is arranged on the bottom surface of the matching groove, and the limiting protrusion is arranged in the circumference of the matching seat.

[0007] Alternatively, a mating seat is provided at the lower end of the hand pull rod, and the mating seat is provided with a mating groove arranged toward the fixed seat, the fixed seat is rotatably connected to the mating groove, and a limiting protrusion and a limiting groove are provided between the fixed seat and the mating groove, the limiting protrusion is arranged on the bottom surface of the mating groove, and the limiting groove is arranged in the circumference of the fixed seat, or the limiting groove is arranged on the bottom surface of the mating groove, and the limiting protrusion is arranged in the circumference of the fixed seat.

[0008] The limiting protrusion and the limiting groove can be elastically matched / separated from each other to form a first vertical limiting state and a second traction position state.

[0009] As an improvement, the limiting groove includes a first limiting groove and a second limiting groove. The first limiting groove elastically cooperates with the limiting protrusion to form a first vertical limiting state, and the first limiting groove is a non-swinging limiting groove. The second limiting groove cooperates with the limiting protrusion to form a second traction swinging state, and the second limiting groove is a swingable limiting groove.

[0010] As an improvement, the swingable limit groove is provided with a first limit end and a second limit end in sequence along the circumference of the mating seat. When the limit protrusion cooperates with the first limit end, the hand rod is located in a high position of traction; when the limit protrusion cooperates with the second limit end, the hand rod is located in a low position of traction; when the limit protrusion is located between the first limit end and the second limit end, the hand rod is located in a movable state between the high position and the low position of traction.

[0011] As an improvement, the cross section of the swingable limiting groove is a fan-shaped groove or an arc-shaped groove; the cross section of the non-swingable limiting groove is a V-shaped, or a semi-arc-shaped, or a tooth-shaped groove.

[0012] As an improvement, the limiting protrusion is in the shape of a long strip or a hemispherical shape along the axial direction, and has a V-shape, a semi-arc shape, or a tooth shape in cross section.

[0013] As an improvement, the limiting protrusion is arranged on the bottom surface of the matching groove along the inner circumference of the matching groove, and the matching groove is also provided with strip-shaped slot holes on both sides of the axial direction of the limiting protrusion so that the limiting protrusion forms a bridge-shaped part that can elastically move up and down, or the matching groove is provided with semi-enclosed slot holes around the limiting protrusion so that the limiting protrusion forms a single-sided integrally connected elastically swingable suspension part.

[0014] Alternatively, the limiting protrusion is a spring top, and the spring top is arranged on the bottom surface of the matching groove.

[0015] As an improvement, the fixing seat and / or the matching seat are made of high elasticity and high hardness engineering plastics.

[0016] As an improvement, the fixing seat and / or matching seat is made of metal material, a cylinder or a ball is elastically provided at the part where the spring top is located, and an elastic body is arranged to cooperate with the cylinder or the ball to form the spring top.

[0017] As an improvement, the mating seat or fixed seat is provided with an opening, and axial holes are provided on the two inner walls of the opening. The two axial holes are provided with two elastic pin shafts. The mating seat or fixed seat with two elastic pin shafts is defined as a quick-release assembly part, and the mating groove is connected to the quick-release / quick-installation assembly part for quick release.

[0018] The two elastic pin shafts are respectively installed in the shaft holes on their respective inner walls from the inside to the outside through the openings. The outer ends of the elastic pin shafts are respectively provided with conical portions or hemispherical portions. The conical portions or hemispherical portions are used to insert the protruding portions of the two elastic pin shafts into the shaft holes. When disassembly is required, the protruding portions are pushed back by the conical portions or hemispherical portions so that the two elastic pin shafts can be disengaged from the shaft holes of the matching grooves. The inner ends of the two elastic pin shafts are provided with cap portions. The inner center of the cap portion is provided with a recessed hole or a protrusion for fixing an elastic member. The elastic member is arranged between the two recessed holes or protrusions and provides an elastic supporting force. The elastic supporting force causes the two elastic pin shafts to extend toward their respective outer sides to form protruding portions, while at the same time being able to overcome the elastic supporting force to retract the protruding portions into the shaft holes.

[0019] When quick installation is required, the elastic supporting force is first overcome to retract the protruding portion, so that the quick-release assembly can be inserted and fitted into the matching groove, and when the two spring pin shafts are aligned with their respective corresponding axial holes, the protruding portion is re-extended to be inserted and fitted into the corresponding axial hole, thereby achieving quick installation.

[0020] When quick release is required, the elastic supporting force is first overcome to retract the protruding portion into the shaft hole, so that the two elastic pin shafts are disengaged from their respective corresponding shaft holes, and then the quick release assembly can be pulled out of the matching groove, thereby completing the quick release.

[0021] As an improvement, both side walls of the matching groove are provided with a guide groove arranged toward the shaft hole, and the guide groove is used to push back the protruding part so that the two elastic pin shafts can be inserted and matched into the shaft hole.

[0022] As an improvement, a protective plug is provided in the opening, and the protective plug is made of elastic material or plastic material. A limiting structure is provided between the protective plug and at least one side of the two inner walls of the opening. When the protective plug is installed into the opening, the limiting structure is used to control the movement of the protective plug in and out.

[0023] As an improvement, the limiting structure includes a limiting protrusion or a hook; the limiting protrusion is equipped with a positioning hole, and the limiting protrusion and the positioning hole are elastically engaged or elastically released; or, the hook is equipped with a positioning hole, and the hook and the positioning hole are elastically engaged or elastically released.

[0024] As an improvement, in the second pulling position state, an angle limiting structure is formed between the lower end of the hand pull rod and the upper front portion of the fixed seat, and the angle limiting structure is used to limit the lowest pulling position of the hand pull rod.

[0025] As an improvement, a screw or rivet is arranged between the mating seat and the fixed seat, and the screw or rivet passes inward from one side of the mating groove to the other side of the mating groove, and the mating seat and the fixed seat are rotatably connected together by a nut or rivet on the other side of the mating groove.

[0026] After adopting the above structure, compared with the prior art, the present invention has the following advantages: the present invention, through structural design, provides a mating seat and the mating groove rotatably connected, and a limiting protrusion and a limiting groove are provided between the mating seat and the mating groove, or a fixed seat and the mating groove are rotatably connected, and a limiting protrusion and a limiting groove are provided between the fixed seat and the mating groove. Further, the limiting protrusion and the limiting groove can elastically cooperate / separate with each other to form a first vertical limiting state and a second traction position state. The first vertical limiting state is to position the hand pull rod in one position through the elastic cooperation of the limiting protrusion and the limiting groove, which is expressed by the vertical limiting state in the present disclosure, and the second traction position state is formed by the limiting protrusion and the limiting groove overcoming the mutual cooperation to separate. Since it is in the separated state, the above-mentioned rotatable connection is utilized so that the lower end of the hand pull rod and the fixed seat can swing relative to each other, thereby forming a traction position state.

[0027] From the above, it can be seen that the present invention does not need to use a spring to achieve switching between two states, and the structure is relatively simple. At the same time, when using it, the user only needs to pull the hand lever to rotate to overcome the mutual elastic force to switch the two states, which is easy to operate. Therefore, the present invention is conducive to greatly simplifying the structure and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention discloses a stereoscopic schematic diagram of a hand pull rod limiting device for a trailer.

[0029] Figure 2 The present invention discloses a front view of a hand pull rod limiting device for a trailer.

[0030] Figure 3 The present invention discloses a left side view of a hand pull rod limiting device for a trailer.

[0031] Figure 4 It is a cross-sectional view along the AA direction.

[0032] Figure 5 It is a schematic diagram of the assembly of the first embodiment from the front side perspective.

[0033] Figure 6 The figure is a schematic diagram of the assembly of the first embodiment from a rear side perspective.

[0034] Figure 7 It is a cross-sectional schematic diagram of the first embodiment in the first vertical limiting state.

[0035] Figure 8 It is a cross-sectional schematic diagram of the first embodiment in the second traction position state and in the high position state.

[0036] Fig. 9 It is a cross-sectional schematic diagram of the first embodiment in the second traction position and in the low position.

[0037] Fig.10 This is a schematic diagram of the assembly of the second embodiment from a front side perspective.

[0038] Fig.11 This is a schematic diagram of the assembly of the third embodiment from a front side perspective.

[0039] Fig.12 This is a schematic diagram of the assembly of the fourth embodiment from a front side perspective.

[0040] Fig.13 The fourth embodiment is an assembly diagram from a rear side perspective.

[0041] Fig.14 This is a schematic diagram of the assembly of the fifth embodiment from a front side perspective.

[0042] Fig.15 This is a schematic diagram of the assembly of the fifth embodiment from a rear side perspective.

[0043] Fig.16 It is a cross-sectional schematic diagram of the fifth embodiment in the first vertical limiting state.

[0044] Fig.17 It is a cross-sectional schematic diagram of the fifth embodiment in the second traction position and in the high position.

[0045] Fig.18 It is a cross-sectional schematic diagram of the fifth embodiment in the second traction position and in the low position.

[0046] Fig.19It is a cross-sectional schematic diagram of embodiment 6 in the first vertical limiting state.

[0047] Fig. 20 It is a cross-sectional schematic diagram of the sixth embodiment in the second traction position and in the high position.

[0048] Fig.21 It is a cross-sectional schematic diagram of the sixth embodiment in the second traction position and in the low position.

[0049] Fig. 22 It is the front view of embodiment 7.

[0050] Fig.23 It is a three-dimensional schematic diagram of embodiment 7 from a rear side perspective.

[0051] Fig.24 It is a cross-sectional view along the BB direction.

[0052] Fig.25 This is a schematic diagram of the assembly of the seventh embodiment from a front side perspective.

[0053] Fig.26 This is a schematic diagram of the assembly of the seventh embodiment from a rear side perspective.

[0054] Fig. 27 This is the front view of the eighth embodiment.

[0055] Fig.28 It is a three-dimensional schematic diagram of the eighth embodiment from a rear side perspective.

[0056] Fig.29 It is a cross-sectional view along CC direction.

[0057] Fig.30 This is a schematic diagram of the assembly of the eighth embodiment from a front side perspective.

[0058] Fig.31 This is a schematic diagram of the assembly of the eighth embodiment from a rear side perspective.

[0059] Fig.32 This is a schematic diagram of the assembly using hooks.

[0060] Fig.33 This is the front view with a straight handle.

[0061] Fig.34 for Fig.33 DD-direction cross-sectional view.

[0062] Fig.35 This is a schematic diagram of the assembly using a straight handle from the front side.

[0063] Fig.36 This is a schematic diagram of the assembly from the rear side when using a straight handle.

[0064] Fig.37 This is a front view of a straight handle with a matching groove provided on one side of the matching seat.

[0065] Fig.38 for Fig.37 EE cross-sectional view.

[0066] Fig.39 An assembly schematic diagram showing a straight handle and a matching groove on one side of the matching seat and a limit groove.

[0067] Fig.40 The assembly diagram shows a straight handle, a matching groove and a limiting protrusion provided on one side of the matching seat.

[0068] As shown in the figure, 1. hand pull rod, 2. fixed seat, 3. matching seat, 4. matching groove, 5. limiting protrusion, 6. limiting groove, 7. first limiting groove, 8. second limiting groove, 9. first limiting end, 10. second limiting end, 11. strip slot, 12. half-wrapped slot, 13. round ball, 14. elastic body, 15. opening, 16. shaft hole, 17. spring pin shaft, 18. cap, 19. elastic part, 20. protruding part, 21. introduction groove, 22. protective plug, 23. hook, 24. positioning hole, 25. upper front part, 26. rivet, 27. handle, 28. straight part, 29. bent part, 30. limiting protrusion, 31. space. DETAILED DESCRIPTION

[0069] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0070] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0071] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0072] like Figures 1 to 40 The figure shows a hand-drawn rod limiting device of a trailer disclosed in the present invention, including a hand-drawn rod 1 and a fixed seat 2 connected to the body of the trailer. In the first category, a matching seat 3 is provided at the lower end of the hand-drawn rod 1, and the fixed seat 2 is provided with a matching groove 4 arranged toward the matching seat 3. The matching seat 3 is rotatably connected to the matching groove 4, and a limiting protrusion 5 and a limiting groove 6 are provided between the matching seat 3 and the matching groove 4. The limiting protrusion 5 is arranged on the bottom surface of the matching groove 4, and the limiting groove 6 is arranged in the circumference of the matching seat 3, or the limiting groove 6 is arranged on the bottom surface of the matching groove 4, and the limiting protrusion 5 is arranged in the circumference of the matching seat 3.

[0073] Alternatively, in the second category, a mating seat 3 is provided at the lower end of the hand pull rod 1, and the mating seat 3 is provided with a mating groove 4 arranged toward the fixed seat 2, the fixed seat 2 is rotatably connected to the mating groove 4, and a limiting protrusion 5 and a limiting groove 6 are provided between the fixed seat 2 and the mating groove 4, the limiting protrusion 5 is arranged on the bottom surface of the mating groove 4, and the limiting groove 6 is arranged in the circumference of the fixed seat 2, or the limiting groove 6 is arranged on the bottom surface of the mating groove 4, and the limiting protrusion 5 is arranged in the circumference of the fixed seat 2.

[0074] In the first category and the second category, the limiting protrusion 5 and the limiting groove 6 can be elastically matched / separated with each other to form a first vertical limiting state and a second traction position state.

[0075] The first case in the first category, such as Figure 4 , 5 As shown in , 6, a matching seat 3 is provided at the lower end of the hand pull rod 1, and the fixed seat 2 is provided with a matching groove 4 arranged toward the matching seat 3. The matching seat 3 and the matching groove 4 are rotatably connected, and a limiting protrusion 5 and a limiting groove 6 are provided between the matching seat 3 and the matching groove 4. The limiting protrusion 5 is arranged on the bottom surface of the matching groove 4, and the limiting groove 6 is arranged in the circumferential direction of the matching seat 3.

[0076] The second case in the first category, such as Fig.14 , 15 As shown in FIGS. 16 , 17 and 18 , the limiting groove 6 is arranged on the bottom surface of the matching groove 4 , and the limiting protrusion 5 is arranged in the circumferential direction of the matching seat 3 .

[0077] The first case in the second category, such as Fig. 22 , 23 As shown in 24, 25 and 26, a matching seat 3 is provided at the lower end of the hand pull rod 1, and the matching seat 3 is provided with a matching groove 4 arranged toward the fixed seat 2, the fixed seat 2 and the matching groove 4 are rotatably connected, and a limiting protrusion 5 and a limiting groove 6 are provided between the fixed seat 2 and the matching groove 4, the limiting protrusion 5 is arranged on the bottom surface of the matching groove 4, and the limiting groove 6 is arranged in the circumferential direction of the fixed seat 2.

[0078] The second case in the second category, such as Fig.33 , 34 As shown in FIGS. 35 and 36 , the limiting groove 6 is arranged on the bottom surface of the matching groove 4 , and the limiting protrusion 5 is arranged in the circumferential direction of the fixing seat 2 .

[0079] The elastic cooperation between the first limiting groove 7 and the limiting protrusion 5 may be that the first limiting groove 7 has elasticity, for example Fig. 27 , 28 As shown in , 29, 30, and 31, the limiting protrusion 5 may also be elastic, for example Figure 5 , 10 shown.

[0080] In some embodiments, in order to simplify the structure and improve reliability, the limiting protrusion 5 and the limiting groove 6 can be elastically matched / separated with each other, such as Figure 5 As shown, the matching groove 4 is further provided with strip-shaped slots 11 on both axial sides of the limiting protrusion 5 so that the limiting protrusion 5 forms a bridge-shaped portion that can elastically move up and down, or as shown in FIG. Fig.10 , 14 As shown in 15, the matching groove 4 is provided with a semi-enclosed groove hole 12 around the limiting protrusion 5 so that the limiting protrusion 5 constitutes a single-sided integrally connected elastically swingable suspension part.

[0081] Of course, the limiting protrusion 5 and the limiting groove 6 can be elastically matched / separated with each other, and other structures can also be used, such as Fig.23 , 24 As shown, Fig.29 , 30 , as shown in 31, etc.

[0082] like Fig. 27 , 28 As shown in FIGS. 29 , 30 and 31 , the limiting protrusion 5 is arranged on the bottom surface of the matching groove 4 and has no elasticity, and the limiting groove 6 is arranged in the circumferential direction of the fixing seat 2 and has elasticity.

[0083] In this example, if Fig.29 , 30 As shown, the portion of the fixing seat 2 corresponding to the limiting groove 6 in the circumferential direction is provided with a space 31 to provide the limiting groove 6 with deformation capability.

[0084] In order to realize the elastic fit / separation of the limiting protrusion 5 and the limiting groove 6 and improve durability and reliability, the fixing seat 2 and / or the matching seat 3 are preferably made of high elasticity and high hardness engineering plastics, such as polyoxymethylene POM, polycarbonate PC, or polyetheretherketone PEEK.

[0085] In some embodiments, the limiting protrusion 5 is a spring top, and the spring top is arranged on the bottom surface of the matching groove 4.

[0086] Further, such as Fig.12 , 13 As shown, a cylinder or ball 13 is elastically provided at the part where the spring top is located, and an elastic body 14 is provided to cooperate with the cylinder or ball 13 to form the spring top, and the fixing seat 2 and / or the matching seat 3 are made of metal material, so that the setting of the spring top is more firm and durable, thereby improving the reliability during repeated use.

[0087] In some embodiments, Figure 6 , 7 As shown in Figures 8 and 9, the limiting groove 6 includes a first limiting groove 7 and a second limiting groove 8. The first limiting groove 7 elastically cooperates with the limiting protrusion 5 to form a first vertical limiting state, and the first limiting groove 7 is a non-swinging limiting groove, while the second limiting groove 8 cooperates with the limiting protrusion 5 to form a second traction swinging state, and the second limiting groove 8 is a swingable limiting groove.

[0088] The cross section of the swingable limiting groove is a fan-shaped groove or an arc-shaped groove; the cross section of the non-swingable limiting groove is a V-shaped, semi-arc-shaped or tooth-shaped groove.

[0089] Further, such as Figure 6 , 7 As shown in Figures 8 and 9, the swingable limit groove is provided with a first limit end 9 and a second limit end 10 in sequence along the circumference of the matching seat 3. When the limit protrusion 5 cooperates with the first limit end 9, the hand rod 1 is located in a high position of traction; when the limit protrusion 5 cooperates with the second limit end 10, the hand rod 1 is located in a low position of traction; when the limit protrusion 5 is located between the first limit end 9 and the second limit end 10, the hand rod 1 is located in a movable state between the high position and the low position of traction.

[0090] The high state and low state structure setting may also be other structures, such as Fig.19 , 20 As shown in FIG. 21 , in the second pulling position, an angle limiting structure is formed between the lower end of the hand pull rod 1 and the front upper portion 25 of the fixing seat 2, and the angle limiting structure is used to limit the lowest pulling position of the hand pull rod 1. In this way, the second limiting groove 8 is omitted, and only the first limiting groove 7 is required.

[0091] like Figure 7 , 8As shown in Figure 9, when it is necessary to switch from the second traction position state to the first vertical limit state, the hand lever 1 is placed in the high traction state, and the hand lever 1 is further rotated to overcome the obstruction of the first limit end 9 so that the first limit groove 7 and the limit protrusion 5 can be restored to match each other. This is the use method of switching between the first vertical limit state and the second traction position state disclosed in the present invention, which is significantly different from the adjustment scheme of the prior art using a series of structures such as springs, and is a significant improvement in the field of trailers.

[0092] In some embodiments, Figures 33 to 40 As shown, a handle 27 is provided on the upper part of the matching seat 3 , and the handle 27 is a straight handle. The upper end of the straight handle is fixedly connected to the lower end of the hand pull rod 1 , and the lower end of the straight handle serves as the matching seat 3 .

[0093] Further, such as Fig.34 , 38 As shown, when the hand rod 1 is in the first vertical limiting state, the limiting protrusion 5 and the first limiting groove 7 cooperate with each other and are located on the axis of the hand rod 1. The front and rear sides of the handle 27 can be used as the movable space in the second traction position state. The advantage of this is that the straight handle scheme can be used regardless of the front and rear directions, which is easy to identify and easy to assemble.

[0094] Further, such as Fig.38 As shown, a second limiting groove 8 is provided on each side of the first limiting groove 7, so that the front and rear directions can be ignored during installation, which is conducive to convenient assembly.

[0095] When the handle 27 is a curved handle, Fig.12 , 13 As shown in , 14 and 15, the bent handle includes a straight portion 28 and a bent portion 29, the straight portion 28 is connected to the lower end of the hand rod 1, and the bent portion 29 is arranged relative to the front side of the hand rod 1, and the bent portion 29 serves as a matching seat 3. In this way, it has a certain ergonomic effect. In addition: 1) The bent handle is arranged forward relative to the fixed seat 2, so that the hand rod 1 can be parallel to the corner column on the front side of the frame (such as the two vertical side rods of the U-shaped front frame) in the first vertical limit state, so that the upper part of the hand rod 1 can be against the cross brace tube of the U-shaped front frame, and the hand rod 1 and the front frame have a visual beauty of coordinated parallelism. 2) When the hand rod 1 is quickly disassembled, it is conducive to realizing that the front end surface of the fixed seat 2 will not exceed too much of the lower cross brace tube on the front side of the frame, ensuring that the size of the frame is small after folding.

[0096] In some embodiments, Fig.11 , 35As shown in FIG. 39, a screw or rivet 26 is arranged between the mating seat 3 and the fixing seat 2. The screw or rivet 26 passes inward from one side of the mating groove 4 to the other side of the mating groove 4, and the mating seat 3 and the fixing seat 2 are rotatably connected together by a nut or rivet at the other side of the mating groove 4. In this way, the structure is simple and the connection is reliable.

[0097] In some embodiments, Figure 5 , 6 , 10, 11, 12, 13, 14, 15, etc., the matching seat 3 or the fixing seat 2 is provided with an opening 15. In this example, the matching seat 3 is mainly provided with an opening 15, and when the fixing seat 2 is provided with an opening 15, the Fig.35 , 36 The fixing seat 2 shown is provided with an opening 15 so as to replace the Fig.35 , 36 The screws or rivets 26 are shown.

[0098] Both inner side walls of the opening 15 are provided with axial holes 16, and the two axial holes 16 are provided with two elastic pin shafts 17. The matching seat 3 or the fixing seat 2 provided with the two elastic pin shafts 17 is defined as a quick-release assembly, and the matching groove 4 is connected with the quick-release / quick-installation assembly.

[0099] The two elastic pin shafts 17 are respectively installed in the shaft holes 16 on their respective inner walls from the inside to the outside through the opening 15. The outer ends of the elastic pin shafts 17 are respectively provided with conical portions or hemispherical portions, and the conical portions or hemispherical portions are used to insert the protruding portions 20 of the two elastic pin shafts 17 into the shaft holes 16. When disassembly is required, the protruding portions 20 are pushed back by the conical portions or hemispherical portions so that the two elastic pin shafts 17 can be disengaged from the shaft holes 16 of the matching grooves 4. The inner ends of the two elastic pin shafts 17 are provided with cap portions 18, and the inner center of the cap portion 18 is provided with a concave hole or a protrusion for fixing an elastic member 19. The elastic member 19 is arranged between the two concave holes or protrusions and provides an elastic supporting force. The elastic supporting force causes the two elastic pin shafts 17 to extend to their respective outer sides to form the protruding portions 20, and at the same time can overcome the elastic supporting force to retract the protruding portions 20 into the shaft holes 16.

[0100] When quick installation is required, the elastic supporting force is first overcome to retract the protruding portion 20, so that the quick-release assembly can be inserted and fitted into the fitting groove 4, and when the two spring pin shafts 17 are aligned with their respective corresponding axial holes 16, the protruding portion 20 is re-extended to be inserted and fitted into the corresponding axial hole 16, thereby achieving quick installation.

[0101] When quick release is required, the elastic supporting force is first overcome to retract the protruding portion 20 into the shaft hole 16, so that the two elastic pin shafts 17 are disengaged from their respective corresponding shaft holes 16, and then the quick release assembly can be pulled out of the matching groove 4, thereby completing the quick release.

[0102] Compared with the screws or rivets 26, the above structure can achieve quick disassembly and assembly, which is convenient for folding, packaging and transportation after quick disassembly.

[0103] Further, such as Figure 5 , 6 As shown, both side walls of the matching groove 4 are provided with an introduction groove 21 arranged toward the shaft hole 16, and the introduction groove 21 is used to push back the protruding portion 20 so that the two elastic pin shafts 17 can be inserted and matched into the shaft hole 16. In this way, quick disassembly and assembly can be realized more conveniently.

[0104] In some embodiments, Figure 5 , 6 As shown, a protective plug 22 is provided in the opening 15. The protective plug 22 is made of an elastic material or a plastic material. The elastic material is such as rubber and silicone, and the plastic material is such as elastic plastic. A limiting structure is provided between the protective plug 22 and at least one side of the two inner side walls of the opening 15. When the protective plug 22 is installed in the opening 15, the limiting structure is used to control the inward and outward movement of the protective plug 22. In this way, since the inner ends of the two elastic pin shafts 17 are provided with caps 18, and the inner center of the cap 18 is provided with a recessed hole or a protrusion for fixing the elastic member 19, the elastic member 19 is arranged between the two recessed holes or protrusions and provides elastic supporting force, the protective plug 22 plays a protective role on the one hand, protecting the structures installed in the opening 15, and more importantly, by installing the protective plug 22, the elastic member 19 is first installed between the two caps 18, and then the protective plug 22 is installed to complete the installation, thereby achieving a more convenient and efficient assembly purpose. Under the radial restriction of the protective plug 22, the elastic member 19 is not easy to fall out of the opening 15. Furthermore, the inner center of the cap 18 is provided with a recessed hole or a protrusion for fixing the elastic member 19, so that the elastic member 19 can be better arranged between the two caps 18 and is not easy to fall out of the opening 15.

[0105] Further, such as Figure 5 As shown, the limiting structure includes a limiting protrusion 30 , and the limiting protrusion 30 is matched with a positioning hole 24 . The elasticity or plasticity of the protective plug 22 is utilized to make the limiting protrusion 30 and the positioning hole 24 elastically fit or elastically release fit.

[0106] Other structures are also possible, such as Fig.32As shown, the limiting structure includes a hook 23, and the hook 23 is matched with a positioning hole 24. The elasticity or plasticity of the hook 23 is utilized to make the hook 23 and the positioning hole 24 elastically fit or elastically release fit.

[0107] When understanding the present invention, if necessary, the above structure can refer to other embodiments / appendices. Figure 1 And understand, no further elaboration here.

[0108] The above description is only an optional specific implementation manner of the present invention. All equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A hand lever limiting device for a trailer, comprising a hand lever (1) and a fixing seat (2) connected to the trailer body, characterized in that: A matching seat (3) is provided at the lower end of the hand pull rod (1), and a matching groove (4) is provided on the fixed seat (2) and is arranged toward the matching seat (3). The matching seat (3) and the matching groove (4) are rotatably connected, and a limiting protrusion (5) and a limiting groove (6) are provided between the matching seat (3) and the matching groove (4), wherein the limiting protrusion (5) is arranged on the bottom surface of the matching groove (4), and the limiting groove (6) is arranged in the circumference of the matching seat (3), or the limiting groove (6) is arranged on the bottom surface of the matching groove (4), and the limiting protrusion (5) is arranged in the circumference of the matching seat (3); Alternatively, a matching seat (3) is provided at the lower end of the hand pull rod (1), and the matching seat (3) is provided with a matching groove (4) arranged toward the fixed seat (2), the fixed seat (2) and the matching groove (4) are rotatably connected, and a limiting protrusion (5) and a limiting groove (6) are provided between the fixed seat (2) and the matching groove (4), the limiting protrusion (5) is arranged on the bottom surface of the matching groove (4), and the limiting groove (6) is arranged in the circumference of the fixed seat (2), or the limiting groove (6) is arranged on the bottom surface of the matching groove (4), and the limiting protrusion (5) is arranged in the circumference of the fixed seat (2); The limiting protrusion (5) and the limiting groove (6) can be elastically matched / separated from each other to form a first vertical limiting state and a second pulling position state.

2. The hand pull rod limiting device of the trailer according to claim 1 is characterized in that: The limiting groove (6) comprises a first limiting groove (7) and a second limiting groove (8). The first limiting groove (7) and the limiting protrusion (5) are elastically matched to form a first vertical limiting state. The first limiting groove (7) is a non-swinging limiting groove. The second limiting groove (8) and the limiting protrusion (5) are matched to form a second traction swinging state. The second limiting groove (8) is a swingable limiting groove.

3. The hand pull rod limiting device of the trailer according to claim 2 is characterized in that: The swingable limit groove is provided with a first limit end (9) and a second limit end (10) in sequence along the circumference of the matching seat (3); when the limit protrusion (5) is matched with the first limit end (9), the hand lever (1) is located in a high position state of traction; when the limit protrusion (5) is matched with the second limit end (10), the hand lever (1) is located in a low position state of traction; when the limit protrusion (5) is located between the first limit end (9) and the second limit end (10), the hand lever (1) is located in a movable state between the high position and the low position of traction.

4. The hand pull rod limiting device of the trailer according to claim 2 is characterized in that: The cross section of the swingable limiting groove is a fan-shaped groove or an arc-shaped groove; the cross section of the non-swingable limiting groove is a V-shaped, semi-arc-shaped or tooth-shaped groove.

5. The hand pull rod limiting device for a trailer according to claim 1, 2, 3 or 4, characterized in that: The limiting protrusion (5) is in the shape of a long strip or a hemispherical shape along the axial direction, and has a V-shape, a semi-arc shape, or a tooth shape in cross section.

6. The hand pull rod limiting device for a trailer according to claim 1, 2, 3 or 4, characterized in that: The limiting protrusion (5) is arranged on the bottom surface of the matching groove (4) along the inner circumference of the matching groove (4), and the matching groove (4) is also provided with strip-shaped slot holes (11) on both sides of the axial direction of the limiting protrusion (5) so that the limiting protrusion (5) forms a bridge-shaped part that can be elastically moved up and down, or the matching groove (4) is provided with a semi-enclosed slot hole (12) around the limiting protrusion (5) so that the limiting protrusion (5) forms a suspension part that is connected integrally on one side and can be elastically swung; Alternatively, the limiting protrusion (5) is a spring top, and the spring top is arranged on the bottom surface of the matching groove (4).

7. The hand pull rod limiting device for a trailer according to claim 1 or 6, characterized in that: The fixing seat (2) and / or the matching seat (3) are made of high-elasticity and high-hardness engineering plastics.

8. The hand pull rod limiting device of the trailer according to claim 6, characterized in that: The fixing seat (2) and / or the matching seat (3) are made of metal material, a cylinder or a ball (13) is elastically provided at the part where the spring top is located, and an elastic body (14) is provided to cooperate with the cylinder or the ball (13) to form the spring top.

9. The hand pull rod limiting device for a trailer according to claim 1, characterized in that: The matching seat (3) or the fixing seat (2) is provided with an opening (15), and the two inner side walls of the opening (15) are provided with axial holes (16), and the two axial holes (16) are provided with two elastic pin shafts (17). The matching seat (3) or the fixing seat (2) provided with the two elastic pin shafts (17) is defined as a quick-release assembly part, and the matching groove (4) is connected with the quick-release assembly part for quick-release / quick-assembly. The two elastic pin shafts (17) are respectively installed in the shaft holes (16) on the inner side walls from the inside to the outside through the opening (15), and the outer ends of the elastic pin shafts (17) are respectively provided with conical parts or hemispherical parts, and the conical parts or hemispherical parts are used to insert the protruding parts (20) of the two elastic pin shafts (17) into the shaft holes (16). When disassembly is required, the protruding parts (20) are pushed back by the conical parts or hemispherical parts so that the two elastic pin shafts (17) can be removed from the matching grooves ( 4), the inner ends of the two elastic pin shafts (17) are provided with caps (18), the inner center of the caps (18) is provided with a concave hole or a protrusion for fixing an elastic member (19), the elastic member (19) is arranged between the two concave holes or the protrusions, and provides an elastic supporting force, the elastic supporting force makes the two elastic pin shafts (17) extend to their respective outer sides to form a protruding portion (20), and at the same time can overcome the elastic supporting force to make the protruding portion (20) retract into the shaft hole (16); When quick installation is required, the elastic supporting force is first overcome to retract the protruding portion (20), thereby enabling the quick-disassembly component to be inserted and fitted into the fitting groove (4); and when the two elastic pin shafts (17) are aligned with their respective corresponding shaft holes (16), the protruding portion (20) is re-extended to be inserted and fitted into the corresponding shaft hole (16), thereby achieving quick installation; When quick release is required, the elastic supporting force is first overcome to allow the protruding portion (20) to retract into the shaft hole (16), thereby causing the two elastic pin shafts (17) to disengage from their respective corresponding shaft holes (16), thereby allowing the quick release assembly to be pulled out of the matching groove (4), thereby completing the quick release.

10. The hand pull rod limiting device of the trailer according to claim 9, characterized in that: Both side walls of the matching groove (4) are provided with an introduction groove (21) arranged toward the shaft hole (16), and the introduction groove (21) is used to push back the protruding part (20) so that the two elastic pin shafts (17) can be inserted and matched into the shaft hole (16).

11. The hand pull rod limiting device of the trailer according to claim 9, characterized in that: A protective plug (22) is arranged in the opening (15), and the protective plug (22) is made of an elastic material or a plastic material. A limiting structure is arranged between at least one side of the two inner side walls of the opening (15) and the protective plug (22). When the protective plug (22) is installed in the opening (15), the limiting structure is used to control the inward and outward movement of the protective plug (22).

12. The hand pull rod limiting device of the trailer according to claim 11, characterized in that: The limiting structure comprises a limiting convex portion (30) or a hook (23); the limiting convex portion (30) is matched with a positioning hole (24), and the limiting convex portion (30) and the positioning hole (24) are elastically matched or elastically released; or the hook (23) is matched with the positioning hole (24), and the hook (23) and the positioning hole (24) are elastically matched or elastically released.

13. The hand pull rod limiting device of the trailer according to claim 1, characterized in that: In the second pulling position state, an angle limiting structure is formed between the lower end of the hand pull rod (1) and the front upper portion (25) of the fixing seat (2), and the angle limiting structure is used to limit the lowest pulling position of the hand pull rod (1).

14. The hand pull rod limiting device of the trailer according to claim 1, characterized in that: A screw or rivet (26) is arranged between the mating seat (3) and the fixing seat (2), and the screw or rivet (26) passes inward from one side of the mating groove (4) to the other side of the mating groove (4), and rotatably connects the mating seat (3) and the fixing seat (2) together through a nut or rivet on the other side of the mating groove (4).

15. The hand pull rod limiting device of the trailer according to claim 1, characterized in that: A handle (27) is provided on the upper part of the matching seat (3). The handle (27) is a straight handle or a curved handle. The upper end of the straight handle is connected to the lower end of the hand rod (1). The lower end of the straight handle serves as the matching seat (3). The curved handle includes a straight portion (28) and a curved portion (29). The straight portion (28) is connected to the lower end of the hand rod (1), and the curved portion (29) is arranged relative to the front side of the hand rod (1). The curved portion (29) serves as the matching seat (3).

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