Lock catch assembly and cart

Abstract

The embodiment of the utility model provides a lock catch assembly and a cart, and relates to the field of carts. The lock catch assembly comprises a locking piece, a limiting piece and a pushing piece, the limiting piece is provided with a limiting part, the pushing piece can move relative to the locking piece to drive the locking piece to be combined with or separated from the limiting part, and the pushing piece is further in sliding fit with the limiting piece; when the lock catch assembly is applied to the pull rod of the cart and the pull rod of the cart needs to be folded, the locking piece can be directly driven by the pushing piece to move, so that the locking piece is separated from the limiting part, one-hand operation can be realized, and the use is more convenient. The embodiment of the utility model provides a cart. The cart comprises a lock catch assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of trolley, specifically, relate to a lock catch subassembly and trolley. BACKGROUND

[0002] The trolley is a tool that can be used for transporting articles, can be used in outdoor activities (such as camping, picnic, fishing etc.), can also be used in places where people flow is dense, such as airports and stations, and articles are placed on the trolley to move, so as to achieve the purpose of saving labor and convenient transportation.

[0003] Most of the existing trolleys are provided with pull rods, and the user can pull the trolley by holding the pull rod, but the pull rod needs to be bent and pressed to unlock the locking pin, and then the pull rod is folded, which cannot be operated by one hand during use and is inconvenient to use. UTILITY MODEL CONTENTS

[0004] The utility model provides a lock catch subassembly and trolley, which can solve the problem of inconvenient unlocking operation of the pull rod of the existing trolley.

[0005] The embodiment of the utility model can be realized as follows:

[0006] The embodiment of the utility model provides a lock catch subassembly, which comprises:

[0007] A locking piece;

[0008] A limiting piece, the limiting piece has a limiting part;

[0009] A pushing piece, the pushing piece is movable relative to the locking piece to drive the locking piece to combine with or separate from the limiting part; the pushing piece is also in sliding cooperation with the limiting piece.

[0010] Optionally, the locking piece comprises a limiting seat, a sliding piece on the limiting seat, a limiting protrusion connected with the sliding piece and a reset driving piece, the reset driving piece is located between the side wall of the limiting seat and the sliding piece, and the limiting protrusion is connected to one side of the sliding piece away from the reset driving piece;

[0011] The limiting part is a limiting groove, and the limiting protrusion can be combined with or separated from the limiting groove under the driving of the pushing piece.

[0012] Optionally, the sliding piece has a first inclined surface, and the pushing piece has a second inclined surface in abutting cooperation with the first inclined surface, when the pushing piece moves towards the locking piece, the second inclined surface abuts against the first inclined surface and drives the sliding piece to move in the direction where the reset driving piece is located.

[0013] Optionally, the limiting seat has a mounting cavity, the sliding piece and the limiting protrusion are at least partially accommodated in the mounting cavity, and the reset driving piece is arranged in the mounting cavity and in on-off contact with the sliding piece.

[0014] Optionally, the sliding member is provided with a clamping cavity, one end of the reset driving member is in contact with the inner wall of the clamping cavity in a clutching manner, and the other end of the reset driving member is in contact with the cavity wall of the mounting cavity.

[0015] Optionally, the lock assembly further comprises a limiting sleeve, the limiting sleeve is provided with a groove, and the locking member is arranged in the groove.

[0016] The limiting member is provided with a limiting platform for limiting cooperation with the limiting sleeve.

[0017] Optionally, the pushing member comprises a push-pull tube and a pressing plug, the pressing plug is arranged at the end of the push-pull tube, and the second inclined surface is arranged on the pressing plug.

[0018] The embodiment of the utility model further provides a cart, including the lock assembly.

[0019] Optionally, the cart further comprises a pull rod, a frame and wheels, the lock assembly is arranged on the pull rod, the pull rod is movably connected with the frame, and the wheels are arranged on the lower part of the frame.

[0020] Optionally, the pull rod comprises branch rods, a connecting member and an outer sleeve, one end of the two branch rods is rotatably connected with the connecting member respectively, the other end of the two branch rods is rotatably connected with the frame, the connecting member is sleeved on the outer sleeve, the lock assembly is arranged on the outer sleeve, and the connecting member is locked or unlocked with the outer sleeve through the lock assembly.

[0021] The embodiment of the utility model has the advantages of:

[0022] The lock assembly comprises a locking member, a limiting member and a pushing member, the limiting member has a limiting part, the pushing member is movable relative to the locking member to drive the locking member to combine with or separate from the limiting part, and the pushing member is in sliding cooperation with the limiting member.

[0023] The cart comprises the lock assembly, and has all the functions of the lock assembly. DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope.

[0025] Figure 1 It is a first state schematic view of the lock assembly provided in the embodiment of the utility model.

[0026] Figure 2 Figure 2 is a second state diagram of the lock assembly provided in the embodiments of the present application;

[0027] Figure 3 Figure 1 is a first perspective diagram of the stroller provided in the embodiments of the present application;

[0028] Figure 4 Figure 2 is a second perspective diagram of the stroller provided in the embodiments of the present application;

[0029] Figure 5 Figure 3 is a position diagram of the lock assembly on the stroller provided in the embodiments of the present application.

[0030] Icon: 1-sliding member; 10-first inclined surface; 11-cavity; 2-reset drive member; 3-push member; 30-push-pull tube; 31-plug; 311-second inclined surface; 4-limiting protrusion; 5-limiting seat; 50-mounting cavity; 6-limiting sleeve; 60-groove; 7-pull rod; 70-branch rod; 71-connector; 711-lock hole; 712-limiting table; 72-outer sleeve; 721-through hole; 8-frame; 80-bottom frame; 801-bottom beam; 802-bottom joint; 81-side frame; 811-side connecting rod; 82-front frame; 821-first vertical rod; 822-first cross tube; 823-first bottom joint; 824-first top joint; 83-rear frame; 831-second vertical rod; 832-second cross tube; 833-second bottom joint; 834-second top joint; 9-wheel. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0033] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0035] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0037] Unless otherwise expressly specified and limited, the terms "provide", "connect" and the like should be broadly understood, for example, "connect" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0039] The embodiment of the utility model provides a kind of lock catch assembly and cart, the lock catch assembly can be applied to cart, to solve the problem that the pull rod of cart exists folding inconvenient, will be described in detail next.

[0040] Please refer to Figure 1 With Figure 2The lock assembly comprises a locking piece, a limiting piece and a pushing piece 3, the limiting piece has a limiting part, the pushing piece 3 is movable relative to the locking piece to drive the locking piece to combine with or separate from the limiting part, and the pushing piece 3 is in sliding fit with the limiting piece. When the lock assembly is applied to the pull rod of the cart, the locking piece can be directly driven to move by the pushing piece 3 when the pull rod of the cart needs to be folded, so that the locking piece is separated from the limiting part, one-hand operation can be realized, and use is more convenient.

[0041] The locking piece comprises a sliding piece 1, a reset driving piece 2 and a limiting protrusion 4, the sliding piece 1 is connected with the limiting protrusion 4, the limiting part on the limiting piece is a limiting groove, and the limiting protrusion 4 can be separated from the limiting groove under the driving of the pushing piece 3.

[0042] The sliding piece 1 has a first inclined surface 10, the pushing piece 3 has a second inclined surface 311, and the first inclined surface 10 can abut against the second inclined surface 311. The pushing piece 3 is used for driving the sliding piece 1 to move towards the direction in which the reset driving piece 2 is compressed, so as to realize the separation of the limiting protrusion 4 and the limiting groove.

[0043] Specifically, the pushing piece 3 comprises a push-pull tube 30 and a compression plug 31, the compression plug 31 is arranged at the end of the push-pull tube 30, the compression plug 31 can be driven to move when the push-pull tube 30 is pulled, the compression plug 31 has the second inclined surface 311, the sliding piece 1 has the first inclined surface 10, and the first inclined surface 10 can be in engagement or disengagement with the second inclined surface 311. When the first inclined surface 10 of the sliding piece 1 abuts against the second inclined surface 311 of the compression plug 31, the sliding piece 1 can be driven to move by pushing the push-pull tube 30, so as to drive the limiting protrusion 4 to move; after the compression plug 31 is separated from the sliding piece 1, the sliding piece 1 is driven to move under the rebounding force of the reset driving piece 2, so as to drive the limiting protrusion 4 to move again, and the direction in which the reset driving piece 2 drives the sliding piece 1 to move is opposite to the direction in which the compression plug 31 drives the sliding piece 1 to move.

[0044] In order to facilitate the installation of the sliding piece 1 and the reset driving piece 2, the lock assembly further comprises a limiting seat 5, the limiting seat 5 has an installation cavity 50, the sliding piece 1 and the reset driving piece 2 are accommodated in the installation cavity 50, and the part, at which the limiting protrusion 4 is connected with the sliding piece 1, is accommodated in the installation cavity 50. One side of the installation cavity 50 penetrates through the side surface of the limiting seat 5, so that the limiting protrusion 4 can freely retract and extend, the top space of the installation cavity 50 is contracted, and the sliding piece 1 is clamped, so that the sliding piece 1 can only slide and move in one direction. It is worth mentioning that the sliding piece 1 is a block, and the first inclined surface 10 on the sliding piece 1 is located outside the limiting seat 5, so as to facilitate the abutment of the second inclined surface 311 of the compression plug 31.

[0045] The sliding piece 1 is provided with a clamping cavity 11 located at one end of the sliding piece 1 away from the limiting protrusion 4, one end of the reset driving piece 2 is clamped in the clamping cavity 11, the other end of the reset driving piece 2 is in contact with the inner wall of the mounting cavity 50, and the clamping cavity 11 improves the stability of the reset driving piece 2 installation. The direction of the rebound force generated by the reset driving piece 2 is the same as the direction of the telescopic movement of the limiting protrusion 4, the reset driving piece 2 is used for pushing the sliding piece 1 to move back to the reset position, and is used for realizing the back position locking of the limiting protrusion 4. The reset driving piece 2 of the embodiment can be a spring.

[0046] In order to improve the integrity of the sliding piece 1, the reset driving piece 2 and the limiting protrusion 4, the lock assembly further comprises a limiting sleeve 6, and the limiting sleeve 6 has a groove 60, and the limiting seat 5 is installed in the groove 60.

[0047] The above-mentioned lock assembly will be applied to the pull rod 7 of the stroller in the following detailed description. Figure 5 The above-mentioned lock assembly is applied to position A on the stroller.

[0048] Refer to Figure 3 and combine Figure 1 with Figure 2 The embodiment of the utility model further provides a stroller, which comprises a pull rod 7, a frame 8, a wheel 9 and the above-mentioned lock assembly, the lock assembly is arranged on the pull rod 7, the pull rod 7 is movably connected with the frame 8, and the wheel 9 is arranged on the lower part of the frame 8.

[0049] Specifically, the pull rod 7 comprises an outer sleeve pipe 72, a connecting piece 71 and two branch rods 70, one end of the two branch rods 70 is respectively hinged to the connecting piece 71, the other end of the two branch rods 70 is rotatably connected with the frame 8, the connecting piece 71 is sleeved on the outer sleeve pipe 72, at this time, the outer sleeve pipe 72 is a limiting piece, a through hole 721 is formed in the pipe side wall of the outer sleeve pipe 72, and the limiting groove is the through hole 721. The sliding piece 1, the reset driving piece 2 and the pushing piece 3 are arranged in the outer sleeve pipe 72, the limiting protrusion 4 can pass through the through hole 721 of the outer sleeve pipe 72 and be combined with the connecting piece 71 to realize locking, and the limiting protrusion 4 is separated from the connecting piece 71 to realize unlocking of the two.

[0050] The outer sleeve pipe 72 is provided with an axial hole in the axial direction, the push-pull pipe 30 and the plug 31 are arranged in the axial hole of the outer sleeve pipe 72, the side wall of the plug 31 is in contact with the inner wall of the axial hole, the plug 31 can slide under the pushing of the push-pull pipe 30, so that the second inclined surface 311 of the plug 31 is in contact with or separated from the first inclined surface 10 of the sliding piece 1, and the upper end of the push-pull pipe 30 extends out of the axial hole; wherein the push-pull pipe 30 and the plug 31 can be connected in a plurality of ways such as screwing and welding. The bottom end of the outer sleeve pipe 72 is inserted into the gap between the limiting sleeve 6 and the limiting seat 5 and clamped tightly, and the limiting seat 5 and the sliding piece 1 and the reset driving piece 2 on the limiting seat 5 are accommodated in the axial hole.

[0051] The outer sleeve 72 is provided with a through hole 721 on the tube side wall, and the side wall of the limiting sleeve 6 is also provided with a through hole 721. The through hole 721 on the outer sleeve 72 corresponds to and communicates with the through hole 721 on the limiting sleeve 6, and the limiting protrusion 4 can smoothly pass through the through hole 721. The connecting piece 71 is provided with a lock hole 711, and the position of the lock hole 711 corresponds to the through hole 721.

[0052] When it is necessary to fold the pull rod 7, the push-pull tube 30 is pushed downward, and the push-pull tube 30 drives the compression plug 31 at the end thereof to move downward. The second inclined surface 311 of the compression plug 31 abuts against the first inclined surface 10 of the sliding piece 1. The axial force of the compression plug 31 acting downward is partially converted into a radial force towards the outer sleeve 72 through the second inclined surface 311 and the first inclined surface 10, thereby pushing the sliding piece 1 to move. The sliding piece 1 moves to compress the reset driving piece 2 and drives the limiting protrusion 4 to exit from the lock hole 711 of the connecting piece 71. The limiting protrusion 4 is retracted through the through hole 721, the limiting protrusion 4 is unlocked with the connecting piece 71, and the connecting piece 71 can slide on the outer sleeve 72. The sliding movement of the connecting piece 71 drives the branch rod 70 connected thereto to rotate, so as to facilitate the folding of the pull rod 7.

[0053] When it is necessary to unfold the pull rod 7, the push-pull tube 30 is pushed downward again, and the push-pull tube 30 drives the compression plug 31 at the end thereof to move downward. The second inclined surface 311 of the compression plug 31 abuts against the first inclined surface 10 of the sliding piece 1. The axial force of the compression plug 31 acting downward is partially converted into a radial force towards the outer sleeve 72 through the second inclined surface 311 and the first inclined surface 10, thereby pushing the sliding piece 1 to move. The sliding piece 1 moves to compress the reset driving piece 2 and drives the limiting protrusion 4 to retract through the through hole 721. The connecting piece 71 slides downward and aligns the lock hole 711 with the through hole 721. The compression plug 31 is separated from the sliding piece 1. The reset driving piece 2 pushes the sliding piece 1 to move after rebounding. The sliding piece 1 drives the limiting protrusion 4 to extend through the through hole 721 and insert into the lock hole 711. The connecting piece 71 is locked, thereby unfolding the pull rod 7.

[0054] When the limiting protrusion 4 passes through the through hole 721 and is inserted into the lock hole 711, the connecting piece 71 and the limiting protrusion 4 are locked together and cannot move relative to each other. The two branch rods 70 hinged to the connecting piece 71 cannot move either. At this time, the entire stroller is in an unfolded state for use.

[0055] It should be noted that the sliding movement direction of the sliding piece 1 is along the radial direction of the outer sleeve 72, and the movement direction of the push-pull tube 30 and the compression plug 31 is along the axial direction of the outer sleeve 72.

[0056] In order to avoid the connecting piece 71 from being separated from the outer sleeve 72, the connecting piece 71 is further provided with a limiting table 712. The top end surface of the limiting sleeve 6 movably abuts against the limiting table 712, and the limiting sleeve 6 limits the connecting piece 71 when the limiting sleeve 6 abuts against the limiting table 712.

[0057] Reference Figure 4 The frame 8 of the embodiment comprises a front frame 82, a rear frame 83, side frames 81 and a bottom frame 80. The side frames 81 are arranged on the left and right sides of the bottom frame 80, the front frame 82 and the rear frame 83 are arranged on the front and rear sides of the bottom frame 80 respectively, and the pull rod 7 is connected with the front frame 82. The side frames 81, the bottom frame 80, the front frame 82 and the rear frame 83 are all foldable.

[0058] The frame 8 of the embodiment further comprises two first bottom joints 823, two first top joints 824, two second bottom joints 833 and two second top joints 834. The front frame 82 is movably connected with the bottom frame 80 through the two first bottom joints 823, the front frame 82 is movably connected with the side frame 81 through the two first top joints 824, the rear frame 83 is movably connected with the bottom frame 80 through the two second bottom joints 833, and the rear frame 83 is movably connected with the side frame 81 through the two second top joints 834. The structures of the two first bottom joints 823 and the two second bottom joints 833 are the same, and a plurality of hinge positions are arranged on the first bottom joint 823 and the second bottom joint 833. The structures of the two first top joints 824 and the two second top joints 834 are the same, and at least two hinge positions are arranged on the first top joint 824 and the second top joint 834.

[0059] The side frame 81 comprises a plurality of X assemblies, and the number of the X assemblies is at least two. The two X assemblies are arranged side by side. The X assemblies are connected by two side connecting rods 811. The side connecting rods 811 of adjacent two X assemblies are rotatably connected. The end of the X assembly close to the front frame 82 or the rear frame 83 is hingedly connected with the first bottom joint 823, the second bottom joint 833, the first top joint 824 and the second top joint 834 through the side connecting rod 811.

[0060] The front frame 82 comprises two first vertical rods 821 and two first cross pipes 822. The two first vertical rods 821 are arranged side by side and spaced apart. The two first cross pipes 822 are crossly and rotatably connected. The two first cross pipes 822 are located between the two first vertical rods 821. The top end of the two first cross pipes 822 is hingedly connected with the first top joint 824 on the corresponding side respectively. The bottom end of the two first cross pipes 822 is hingedly connected with the first bottom joint 823 on the corresponding side respectively.

[0061] The first vertical rod 821 comprises an outer pipe and an inner pipe. The inner pipe is arranged inside the outer pipe and can move axially in the outer pipe. The first top joint 824 is installed at the top end of the inner pipe. The first bottom joint 823 is installed on the outer wall of the bottom end of the outer pipe. The first bottom joint 823 is connected with the wheel support of the wheel 9. The wheel 9 is connected with the wheel support.

[0062] The rear frame 83 is the same structure as the front frame 82, the rear frame 83 comprises two second vertical rods 831 and two second cross pipes 832, the two second vertical rods 831 are arranged side by side and spaced apart, the two second cross pipes 832 are cross rotatably connected, the two second cross pipes 832 are located between the two second vertical rods 831, the top ends of the two second cross pipes 832 are respectively hinged to the second top joints 834 on the corresponding sides, and the bottom ends of the two second cross pipes 832 are respectively hinged to the second bottom joints 833 on the corresponding sides.

[0063] The second vertical rod 831 also comprises an outer pipe and an inner pipe, the inner pipe is arranged in the inner pipe and can move axially in the outer pipe, the arrangement of the second vertical rod 831 can be referred to the first vertical rod 821, the second top joint 834 is installed at the top end of the inner pipe, and the second bottom joint 833 is installed on the outer wall of the bottom end of the outer pipe, the second bottom joint 833 is connected with the wheel support of the wheel 9, and the wheel 9 is connected with the wheel support.

[0064] The bottom frame 80 comprises a bottom joint 802 and four bottom beams 801, the bottom joint 802 is provided with at least four hinge positions, one ends of the four bottom beams 801 are respectively hinged to the hinge positions of the bottom joint 802, and the other ends of the four bottom beams 801 are respectively hinged to the two first bottom joints 823 and the two second bottom joints 833, so that the four bottom beams 801 move coordinately when the stroller is folded or unfolded.

[0065] The stroller of the embodiment has four wheels 9, and the four wheels 9 are connected with the two first bottom joints 823 and the two second bottom joints 833 through four wheel supports.

[0066] The stroller of the embodiment is provided with a lock catch assembly, when the stroller pull rod 7 is folded, the sliding part 1 can be directly pushed to move by the pushing part 3, the sliding part 1 moves to drive the limiting protrusion 4 to retract and be unlocked, so that a user can operate the unlocking with one hand, and the stroller is more convenient to use.

[0067] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A strike assembly comprising: The lock assembly comprises: a locking member; a limiting member provided with a limiting portion; a pushing member (3) movable relative to the locking member to drive the locking member to engage with or disengage from the limiting portion; the pushing member (3) is also in sliding fit with the limiting member.

2. The hasp assembly of claim 1, wherein, The locking member comprises a limiting seat (5), a sliding member (1) located on the limiting seat (5), a limiting protrusion (4) connected with the sliding member (1), and a reset driving member (2) located between the side wall of the limiting seat (5) and the sliding member (1); the limiting protrusion (4) is connected to the side of the sliding member (1) away from the reset driving member (2). The limiting portion is a limiting groove, and the limiting protrusion (4) can be driven by the pushing member (3) to engage with or disengage from the limiting groove.

3. The hasp assembly of claim 2, wherein, The sliding member (1) has a first inclined surface (10), and the pushing member (3) has a second inclined surface (311) in abutting fit with the first inclined surface (10); when the pushing member (3) moves towards the locking member, the second inclined surface (311) abuts against the first inclined surface (10) and drives the sliding member (1) to move towards the direction where the reset driving member (2) is located.

4. The hasp assembly of claim 2, wherein, The limiting seat (5) has a mounting cavity (50), and the sliding member (1) and the limiting protrusion (4) are at least partially accommodated in the mounting cavity (50); the reset driving member (2) is arranged in the mounting cavity (50) and in on-off contact with the sliding member (1).

5. The hasp assembly of claim 4, wherein, The sliding member (1) is provided with a clamping cavity (11), one end of the reset driving member (2) is in on-off contact with the inner wall of the clamping cavity (11), and the other end of the reset driving member (2) abuts against the cavity wall of the mounting cavity (50).

6. The hasp assembly of claim 1, wherein, The lock assembly further comprises a limiting sleeve (6) provided with a groove (60), and the locking member is arranged in the groove (60); the limiting member is provided with a limiting platform (712) for limiting fit with the limiting sleeve (6).

7. The hasp assembly of claim 3, wherein, The pushing member (3) comprises a push-pull tube (30) and a pressing plug (31), the pressing plug (31) is arranged at the end of the push-pull tube (30), and the second inclined surface (311) is arranged on the pressing plug (31).

8. A cart characterized by, The trolley further comprises a pull rod (7), a frame (8), and a wheel (9), the lock assembly is arranged on the pull rod (7), the pull rod (7) is movably connected with the frame (8), and the wheel (9) is arranged at the lower part of the frame (8).

9. The cart of claim 8, wherein, The trolley further comprises a pull rod (7), a frame (8), and a wheel (9), the lock assembly is arranged on the pull rod (7), the pull rod (7) is movably connected with the frame (8), and the wheel (9) is arranged at the lower part of the frame (8).

10. The cart of claim 9, wherein, The pull rod (7) comprises branch rods (70), connecting pieces (71) and outer sleeves (72), one end of each of the two branch rods (70) is rotatably connected with the connecting piece (71), the other end of each of the two branch rods (70) is rotatably connected with the frame (8), the connecting piece (71) is sleeved on the outer sleeve (72), the lock assembly is arranged on the outer sleeve (72), and the connecting piece (71) is locked or unlocked with the outer sleeve (72) through the lock assembly.

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