CN110126894B

CN110126894B - Shopping hand buggy

Info

Publication number: CN110126894B
Application number: CN201910380753.2A
Authority: CN
Inventors: 冯辰
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-08
Filing date: 2019-05-08
Publication date: 2021-07-13
Anticipated expiration: 2039-05-08
Also published as: CN110126894A

Abstract

The invention discloses a shopping hand buggy, and belongs to the field of hand trolleys. The shopping cart comprises: two mounting panels and two loose wheel mechanisms, every loose wheel mechanism all includes: the middle parts of the two movable rods are respectively rotatably arranged on the corresponding mounting plates, and the movable wheel is rotatably arranged on the first end of the movable rod; the movable rod is configured to rotate between a first position and a second position, when the movable rod is located at the first position, the movable rod is arranged in parallel with the plane and is fixed on the mounting plate through the locking device, when the movable rod is located at the second position, an included angle is formed between the movable rod and the plane, and the movable rod is fixed on the mounting plate through the locking device. The movable rod is supported on the frame and bears part of the weight of the heavy object, a user only needs to provide forward power for the shopping trolley, and the two walking wheels and the two movable wheels are grounded, so that the problem of toppling of the shopping trolley is effectively solved.

Description

Shopping hand buggy

Technical Field

The invention relates to the field of hand carts, in particular to a shopping hand cart.

Background

The shopping hand buggy is a hand buggy widely used by citizens during shopping. The shopping trolley can help a user to contain a large amount of articles and save labor, and is popular among the middle-aged and the elderly.

The current shopping cart comprises: the shopping trolley comprises a frame, two travelling wheels arranged at the bottom of the frame, a handle arranged at the top of the frame and a shopping bag fixed on the frame, wherein articles are placed in the shopping bag, a user pulls the handle to obliquely place the shopping trolley, and the shopping trolley is pulled to advance through the two travelling wheels.

When the shopping cart bears more heavy objects, a user needs to pull the shopping cart to move forward and bear the weight of the heavy objects on the shopping cart, so that the user is more laboursome when dragging the shopping cart. Simultaneously, for the convenience of pulling the shopping hand buggy, two walking wheels are all great to the distance between the handle respectively during the setting, can convenient to use person like this pull the shopping hand buggy, but, set up like this and can reduce the stability of shopping hand buggy, and the shopping hand buggy is emptyd easily at the in-process of marcing. Moreover, the old people are weak in hands and feet and are not easy to pull the shopping cart.

Disclosure of Invention

In order to solve the problem that a shopping cart in the prior art is not easy to drag, the embodiment of the invention provides a shopping cart. The technical scheme is as follows:

the invention provides a shopping cart, comprising: frame, walking wheel and handle, the frame includes: the walking wheel is rotatably arranged at the bottom of the frame, and the handle is arranged at the top of the frame.

The shopping cart further comprises: two mounting panels and two loose wheel mechanisms, two mounting panels are fixed respectively the both sides of frame, two loose wheel mechanisms are arranged respectively the both sides of two mounting panels, every loose wheel mechanism all includes: the movable rod, the movable wheel and the locking device, two the middle part of movable rod is rotatable the installation respectively and is corresponding on the mounting panel, the movable wheel is rotatable to be installed the first end of movable rod is served.

The movable rod is configured to rotate between first position and second position, works as the movable rod is located during the first position, the movable rod with plane parallel arrangement, just the movable rod passes through locking device fixes on the mounting panel, works as the movable rod is located during the second position, the movable rod with be provided with the contained angle between the plane, just the movable rod passes through locking device fixes on the mounting panel, the movable wheel with walking wheel parallel arrangement.

Specifically, the included angle is 30-165 degrees.

Specifically, the locking device includes a ball, a ball mounting hole has been opened at the second end of the movable rod, a cover plate has been installed on the ball mounting hole, a through-hole has been opened on the cover plate, the ball mounting hole with the mounting panel is arranged relatively, a part of ball is arranged in the ball mounting hole and clamps on the through-hole, another part of ball stretches out outside the through-hole, set up on the mounting panel with the ball outside the ball mounting hole matches first arc hole and second arc hole, works as the movable rod is located when the first position, another part of ball is located in the first arc hole, works as the movable rod is located when the second position, another part of ball is located in the second arc hole.

Further, the shopping cart further comprises: a first unlocking device and a second unlocking device, the first unlocking device comprising: a first pin shaft and a second pin shaft, wherein the mounting plate is provided with a first mounting hole and a second mounting hole which are mutually communicated, the first arc-shaped hole is communicated with the first mounting hole, the second mounting hole extends to the side wall of the mounting plate, the first end of the first pin shaft is positioned in the second mounting hole, and a first inclined plane is arranged on the first end of the first pin shaft, the second end of the first pin shaft extends out of the mounting plate, the first end of the second pin shaft is positioned in the first mounting hole, the second end of the second pin shaft is positioned in the second mounting hole, the first end of the second pin shaft is provided with a second inclined surface matched with the first inclined surface, the first pin shaft is configured to drive the second pin shaft to move towards the first arc-shaped hole through the matching of the first inclined surface and the second inclined surface, and the structure of the second unlocking device is the same as that of the first unlocking device.

Furthermore, install the limiting plate on the mounting panel, the limiting plate covers on the second mounting hole, set up on the limiting plate with the spacing hole of diameter matched with of first round pin axle, the middle part of first round pin axle is arranged in spacing downthehole, the first of first round pin axle is served and is provided with the button, just the button is arranged the top of limiting plate, the button with be provided with reset spring between the limiting plate, first round pin epaxial be provided with limiting plate matched with spacing bulge loop, spacing bulge loop arranges the below of limiting plate.

Furthermore, a supporting spring is further arranged in the ball mounting hole, one end of the supporting spring abuts against the inner wall of the ball mounting hole, and the other end of the supporting spring abuts against the ball.

Specifically, every the activity wheel mechanism all includes the push rod, the middle part of push rod is rotatable to be installed on the mounting panel, the first end of push rod extends to outside the mounting panel, the second end of push rod supports the center of rotation of movable rod with between the first end of movable rod, the first end of push rod is arrived the distance at the center of rotation of push rod is greater than the second end of push rod arrives the distance at the center of rotation of push rod.

Furthermore, the second end of the push rod is rotatably provided with a pulley, the outer wall of the movable rod is provided with a slide rail matched with the pulley, the slide rail is arranged along the length direction of the movable rod, and two ends of the slide rail are respectively provided with a baffle.

Specifically, shopping cart still includes the installation axle, the installation axle is fixed respectively on two mounting panels, two bearings are installed respectively to the both ends of installation axle, the middle part suit of movable rod is in correspondence on the bearing.

Further, each bearing is covered with a bearing cover.

The technical scheme provided by the embodiment of the invention has the following beneficial effects: according to the shopping trolley provided by the embodiment of the invention, when a lot of heavy objects are carried on the shopping trolley, a user can rotate the movable rod from the first position to the second position, so that an included angle exists between the movable rod and the plane, the position of the movable rod is fixed through the locking device, when the shopping trolley advances, the travelling wheels and the movable wheels are all grounded, the movable rod is supported on the trolley frame, and a part of weight of the heavy objects is borne, so that when the user pulls the shopping trolley, only power for advancing the shopping trolley is needed to be provided, meanwhile, the two travelling wheels and the two movable wheels are both grounded, the shopping trolley has good stability, and the dumping problem of the shopping trolley is effectively avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a shopping cart according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a movable rod in a first position according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the movable rod in a second position according to the present invention;

fig. 4 is a schematic structural diagram of a first unlocking device and a movable rod according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first unlocking device, a second unlocking device and a mounting plate according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Examples

An embodiment of the present invention provides a shopping cart, as shown in fig. 1, the shopping cart includes: frame 1, walking wheel 2 and handle 3. The vehicle frame 1 includes: a first support bar 1a and a second support bar 1 b. The first supporting rod 1a and the second supporting rod 1b are both arranged in a plane, the first supporting rod 1a and the second supporting rod 1b are oppositely arranged in parallel at intervals, the frame 1 can further comprise a supporting bottom plate 1c, one side of the supporting bottom plate 1c is fixed on the bottom end of the first supporting rod 1a, and the other side of the supporting bottom plate 1c is fixed on the bottom end of the second supporting rod 1 b. The road wheels 2 are rotatably mounted on the bottom of the frame 1, and in other embodiments, the road wheels 2 can also be rotatably mounted on the support base plate 1 c. The handle 3 is installed on the top of the frame 1, specifically, one end of the handle 3 is fixed on the top end of the first support rod 1a, and the other end of the handle 3 is fixed on the top end of the second support rod 1 b.

This shopping cart still includes: two mounting plates 4 and two moving wheel mechanisms. The two mounting plates 4 are respectively fixed on two sides of the frame 1, specifically, the two mounting plates 4 are respectively fixed on the first support rod 1a and the second support rod 1b, and the two movable wheel mechanisms are respectively arranged on two sides of the two mounting plates 4. As shown in fig. 2, each of the movable wheel mechanisms includes: a movable rod 5, a movable wheel 6 and a locking device. The middle parts of the two movable rods 5 are respectively and rotatably arranged on the corresponding mounting plates 4, and the movable wheels 6 are rotatably arranged on the first ends 5a of the movable rods 5. In implementation, the two mounting plates 4 may be fixed to the first support rod 1a and the second support rod 1b by bolts or welding.

The movable lever 5 is configured to rotate between a first position and a second position. As shown in fig. 2, when the movable lever 5 is located at the first position, the movable lever 5 is arranged in parallel with the plane, specifically, the movable lever 5 is arranged in parallel with the first support lever 1a, and the movable lever 5 is fixed to the mounting plate 4 by the locking device. As shown in fig. 3, when the movable rod 5 is located at the second position, an included angle α is formed between the movable rod 5 and the plane, specifically, an included angle α is formed between the movable rod 5 and the first support rod 1a, the movable rod 5 is fixed on the mounting plate 4 through the locking device, and the movable wheel 6 is arranged in parallel with the traveling wheel 2.

In the present embodiment, the mounting plate 4 is a circular plate, and in other embodiments, the mounting plate 4 may also be a semicircular plate, a rectangular plate, or other irregular shapes.

Specifically, the included angle α may be 30 ° to 165 °. When the shopping cart is used, the included angle alpha can be adjusted according to the angle of the shopping cart pulled by a user, and can be gradually increased along with the reduction of the included angle between the shopping cart and the horizontal plane. When the included angle between the shopping cart and the horizontal plane is 45 degrees, the included angle alpha can be 90 degrees. When the shopping handcart climbs on an accessible ramp, the included angle alpha can be 30-45 degrees, so that the shopping handcart can smoothly move forward on the ramp to avoid dumping. Preferably, the distance from the rotation center of the movable lever 5 to the rotation center of the road wheels 2 is greater than the distance from the rotation center of the movable lever 5 to the rotation center of the movable wheels 6. Therefore, when the movable rod 5 is in the first position, the shopping trolley travels obliquely, so that the travelling wheels 2 and the movable wheels 6 land simultaneously, and the stability of the shopping trolley can be improved.

As shown in fig. 4, the locking device includes a ball 52b, a ball mounting hole 51b is opened on the second end 5b of the movable rod 5, the ball mounting hole 51b is disposed opposite to the mounting plate 4, a cover plate 53b is mounted on the ball mounting hole 51b, a through hole is opened on the cover plate 53b, a part of the ball 52b is disposed in the ball mounting hole 51b and is clamped on the through hole, and another part of the ball 52b extends out of the through hole. The mounting plate 4 is provided with a first arc-shaped hole 4a and a second arc-shaped hole 4d which are matched with a ball 52b outside the ball mounting hole 51b, when the movable rod 5 is located at the first position, the other part of the ball 52b is located in the first arc-shaped hole 4a, and when the movable rod 5 is located at the second position, the other part of the ball 52b is located in the second arc-shaped hole 4 d. When the locking device is implemented, the ball 52b can be separated from the first arc-shaped hole 4a in a manual mode, and the movable rod 5 is pushed to rotate, so that the ball 52b slides into the second arc-shaped hole 4 d.

In other embodiments, the locking device may also be a locking pin (not shown), and accordingly, the second end 5b of the movable rod 5 is provided with a locking pin mounting hole, and the locking pin is movably inserted into the locking pin mounting hole.

Further, the shopping cart may further include: a first unlocking device 7 and a second unlocking device 8, the first unlocking device 7 may include: a first pin 7a and a second pin 7b, the mounting plate 4 is provided with a first mounting hole 4b and a second mounting hole 4c which are communicated with each other, the first arc-shaped hole 4a is communicated with the first mounting hole 4b, the second mounting hole 4c extends to the side wall of the mounting plate 4, the first end of the first pin 7a is positioned in the second mounting hole 4c, the first end of the first pin 7a is provided with a first inclined surface 71a, the second end of the first pin 7a extends out of the mounting plate 4, the first end of the second pin 7b is positioned in the first mounting hole 4b, the second end of the second pin 7b is positioned in the second mounting hole 4c, the first end of the second pin 7b is provided with a second inclined surface 72a which is matched with the first inclined surface 71a, the first pin 7a is configured to drive the second pin 7b to move towards the direction of the first arc-shaped hole 4a through the matching of the first inclined surface 71a and the second inclined surface 72a, and separates the ball 52b from the first arc-shaped hole 4 a. When the installation structure is used, the aperture of the first installation hole 4b is in clearance fit with the outer diameter of the second pin shaft 7b, so that the second pin shaft 7b can move in the first installation hole 4b, meanwhile, the first installation hole 4b can be in a stepped hole form or in a variable aperture, and the end with the large aperture is arranged at the second installation hole 4c, so that the stress condition of the second pin shaft 7b can be improved, and the second pin shaft 7b is prevented from falling off in the second pin shaft 7 b.

As shown in fig. 5, the second unlocking means 8 has the same structure as the first unlocking means 7. Specifically, the second unlocking means 8 may include: a third pin shaft 8a and a fourth pin shaft 8b, a third mounting hole and a fourth mounting hole which are mutually communicated are formed in the mounting plate 4, the second arc-shaped hole 4d is communicated with the third mounting hole, the fourth mounting hole extends to the side wall of the mounting plate 4, the first end of the third pin shaft 8a is located in the fourth mounting hole, a third inclined plane 81a is arranged on the first end of the third pin shaft 8a, the second end of the third pin shaft 8a extends out of the mounting plate 4, the first end of the fourth pin shaft 8b is located in the third mounting hole, the second end of the fourth pin shaft is located in the fourth mounting hole, a fourth inclined plane matched with the third inclined plane is arranged on the first end of the fourth pin shaft, the third pin shaft is configured to drive the fourth pin shaft to move towards the direction of the second arc-shaped hole 4d through the matching of the third inclined plane and the fourth inclined plane, and the ball 52b is separated from the second arc-shaped hole 4 d.

In practice, the shape of the second end of the second pin 7b and the second end of the fourth pin 8b may match the shape of the ball 52 b. Therefore, the contact area between the second pin shaft 7b and the ball 52b and the contact area between the fourth pin shaft 8b and the ball 52b can be respectively increased, and the ball 52b can be effectively pushed out by the second pin shaft 7b and the fourth pin shaft 8 b.

Specifically, the mounting plate 4 may be provided with lightening holes 20. The lightening holes 20 can reduce the weight of the shopping cart, and a user can conveniently pull the shopping cart.

As shown in fig. 4, a limiting plate 9 can be installed on the mounting plate 4, the limiting plate 9 covers the second mounting hole 4c, a limiting hole 9a matched with the diameter of the first pin shaft 7a is formed in the limiting plate 9, the middle of the first pin shaft 7a is arranged in the limiting hole 9a, a button 10 is arranged at the first end of the first pin shaft 7a, the button 10 is arranged above the limiting plate 9, a return spring 11 is arranged between the button 10 and the limiting plate 9, a limiting convex ring 12 is arranged on the first pin shaft 7a, and the limiting convex ring 12 is arranged below the limiting plate 9. Accordingly, the stopper plate 9 may cover the fourth mounting hole. The aperture of the second mounting hole 4c is larger than the limiting convex ring 12, so that the first pin shaft 7a can move in the second mounting hole 4c conveniently. Meanwhile, the aperture of the limiting hole 9a is smaller than the outer diameter of the limiting convex ring 12, so that the first pin shaft 7a can be prevented from sliding out of the second mounting hole 4c, on the other hand, the limiting plate 9 can provide a mounting position for the reset spring 11, the first pin shaft 7a can be lifted in time through the reset spring 11 after being pressed down, and preparation is made for the second operation. The diameter of the first pin 7 is small, if the fingers of a user directly contact and exert acting force on the first pin 7, the contact surface of the fingers and the first pin 7 can bear large acting force, discomfort can be brought to the fingers, the contact area of the fingers and the first pin 7a is increased by the button 10, and the discomfort of the fingers is reduced.

In this embodiment, a first end of the second pin 7b may be provided with a limiting block 21, and the limiting block 21 is used to prevent the second pin 7b from sliding out of the mounting plate 4 from one side of the first arc-shaped hole 4 a. Meanwhile, the axial length of the second pin shaft 7b can be larger than the aperture of the second mounting hole 4c, so that the second pin shaft 7b can be prevented from sliding out of the first mounting hole 4b and falling into the second mounting hole 4 c.

Specifically, the ball mounting hole 51b may further be provided therein with a support spring 16, one end of the support spring 16 abutting against an inner wall of the ball mounting hole 51b, and the other end of the support spring 16 abutting against the ball 52 b. When realizing, can install ball 52b on ball mounting hole 51b for the great majority, can avoid ball 52b to drop outside ball mounting hole 51b like this, because ball 52b need bear the thrust of second round pin axle 7b, this makes ball 52b imbed too deeply in ball mounting hole 51b easily, thereby influence the locking effect, supporting spring 16 can support ball 52b, and support ball 52b on ball mounting hole 51b, guarantee the locking effect of ball 52b and first arc hole 4a and second arc hole 4 d.

Referring to fig. 2 and 3, each of the movable wheel mechanisms may include a push rod 13, a middle portion of the push rod 13 may be rotatably mounted on the mounting plate 4, a first end 13a of the push rod 13 extends out of the mounting plate 4, a second end 13b of the push rod 13 abuts between a rotation center of the movable rod 5 and the first end 5a of the movable rod 5, and a distance from the first end 13a of the push rod 13 to the rotation center of the push rod 13 is greater than a distance from the second end 13b of the push rod 13 to the rotation center of the push rod 13. The push rod 13 can help the user push the movable lever 5 out, and the distance from the first end 13a of the push rod 13 to the rotation center of the push rod 13 is greater than the distance from the second end 13b of the push rod 13 to the rotation center of the push rod 13, so that the user can save more labor by pushing the movable lever 5 through the push rod 13.

Further, a pulley 14 is rotatably mounted on the second end 13b of the push rod 13, a slide rail 15 matched with the pulley 14 is disposed on the outer wall of the movable rod 5, the slide rail 15 is arranged along the length direction of the movable rod 5, and two ends of the slide rail 15 are respectively provided with a baffle 16. When the user promotes the movable rod 5 through the push rod 13, the cooperation of pulley 14 and slide rail 15 can make the movable rod 5 more easily promoted, and promotes the in-process, and slide rail 15 has the effect of spacing direction, makes the direction motion that the movable rod 5 can provide along slide rail 15. The blocking plate 16 can prevent the pulley 14 from sliding out of the sliding rail 15. When the sliding rail is used, the pulley 14 can be mounted on the second end 13b of the push rod 13 through the rotating shaft 14a, two ends of the rotating shaft 14a respectively extend out of the pulley 14, the side walls of two sides of the sliding rail 15 can be provided with a limiting groove (not shown), and the rotating shaft 14a can be slidably mounted in the corresponding limiting groove. The pulley 14 can be prevented from being separated from the slide rail 15 by the stopper groove.

In other embodiments, a slider (not shown) can be mounted on the second end 13b of the push rod 13 to cooperate with the slide rail 15. The process that the push rod 13 pushes the movable rod 5 to rotate is completed through the matching of the slide block and the slide rail 15.

As shown in fig. 1 and fig. 2, the shopping cart may further include a mounting shaft 17, the mounting shaft 17 is fixed on the two mounting plates 4, two bearings 18 are mounted at two ends of the mounting shaft 17, and the middle portion of the movable rod 5 is sleeved on the corresponding bearings 18. The mounting shaft 17 is fixed to the two mounting plates 4 so that the two mounting plates 4 can be supported, thereby improving the stability of the shopping cart.

In other embodiments, the mounting shaft 17 may comprise two sub-mounting shafts (not shown) that are fixed to the two mounting plates 4, respectively. The two sub-mounting shafts can reduce the weight of the shopping trolley, and a user can conveniently pull the shopping trolley.

When the bicycle is realized, the support bottom plate 1c can be used for placing an object containing bag a which is used for containing articles and can be fixed on the bicycle frame 1. Supporting plate b can be arranged on the bottom surface of supporting base plate 1c, supporting plate b and walking wheel 2 interval arrangement are on the bottom surface of supporting base plate 1c, and when shopping hand buggy was vertical to be placed, accessible supporting plate b supported shopping hand buggy with walking wheel 2, avoided shopping hand buggy to empty. The walking wheels 2 and the movable wheels 6 can be universal wheels, so that the shopping trolley can conveniently advance. The frame 1 can also be provided with reinforcing rib plates (not shown) which are used for improving the stress capacity of the frame 1.

As shown in fig. 1, each bearing 18 may be covered with a bearing cover 19. The bearing cover 19 can prevent dust and moisture from entering the bearing 18, thereby ensuring the performance of the bearing 18. Meanwhile, the bearing cover 19 can prevent the hair or the silk towel of the user from being drawn into the bearing 18, thereby improving the safety of the shopping trolley.

Specifically, an arc-shaped ball sliding groove (not shown) can be formed between the first arc-shaped hole 4a and the second arc-shaped hole 4d of the mounting plate 4, and when the mounting plate is implemented, the ball sliding groove can be formed along the movement track of the ball 52b, so that the ball 52b can move between the first arc-shaped hole 4a and the second arc-shaped hole 4d conveniently.

The working principle of the shopping cart provided by the embodiment of the invention is briefly introduced as follows:

when a lot of heavy objects are loaded on the shopping trolley, a user can rotate the movable rod 5 from the first position to the second position, so that an included angle is formed between the movable rod 5 and the plane, the position of the movable rod is fixed through the locking device, the travelling wheels 2 and the movable wheels 6 of the shopping trolley are both grounded, the movable rod 5 bears a part of the weight of the heavy objects, and the user only needs to provide forward power for the shopping trolley when dragging the shopping trolley.

When the shopping trolley is not provided with a large number of heavy objects, the movable rod 5 can be rotated to the first position from the second position, at the moment, the movable rod 5 is arranged in parallel with the plane, the movable wheel 6 can not touch the ground, and a user can only rotate through the traveling wheel 2 when dragging the shopping trolley to advance.

Further, the first support bar 1a and the second support bar 1b may be curved, so that the center of gravity of the shopping cart carrying goods can be adjusted.

According to the shopping trolley provided by the embodiment of the invention, when a lot of heavy objects are carried on the shopping trolley, a user can rotate the movable rod from the first position to the second position, so that an included angle exists between the movable rod and the plane, the position of the movable rod is fixed through the locking device, when the shopping trolley advances, the travelling wheels and the movable wheels are all grounded, the movable rod is supported on the trolley frame, and a part of weight of the heavy objects is borne, so that when the user pulls the shopping trolley, only power for advancing the shopping trolley is needed to be provided, meanwhile, the two travelling wheels and the two movable wheels are both grounded, the shopping trolley has good stability, and the dumping problem of the shopping trolley is effectively avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A shopping cart comprising: frame, walking wheel and handle, the frame includes: the first support rod and the second support rod are arranged in parallel at intervals in the same plane, the travelling wheels are rotatably arranged at the bottom of the frame, the handle is arranged at the top of the frame,

the shopping cart further comprises: two mounting panels and two loose wheel mechanisms, two mounting panels are fixed respectively the both sides of frame, two loose wheel mechanisms are arranged respectively the both sides of two mounting panels, every loose wheel mechanism all includes: the movable rod, the movable wheel and the locking device, the middle parts of the two movable rods are respectively rotatably arranged on the corresponding mounting plates, the movable wheel is rotatably arranged on the first end of the movable rod, each movable wheel mechanism comprises a push rod, the middle part of the push rod is rotatably arranged on the mounting plates, the first end of the push rod extends out of the mounting plates, the second end of the push rod is abutted between the rotating center of the movable rod and the first end of the movable rod, the distance from the first end of the push rod to the rotating center of the push rod is greater than the distance from the second end of the push rod to the rotating center of the push rod,

the movable rod is configured to rotate between a first position and a second position, when the movable rod is located at the first position, the movable rod is arranged in parallel with the plane and is fixed on the mounting plate through the locking device, when the movable rod is located at the second position, an included angle is formed between the movable rod and the plane, the included angle is 30-165 degrees, and the movable wheel is arranged in parallel with the traveling wheel;

the locking device comprises a ball, a ball mounting hole is formed in the second end of the movable rod, a cover plate is mounted on the ball mounting hole, a through hole is formed in the cover plate, the ball mounting hole and the mounting plate are arranged oppositely, one part of the ball is arranged in the ball mounting hole and clamped on the through hole, the other part of the ball extends out of the through hole, a first arc-shaped hole and a second arc-shaped hole matched with the ball outside the ball mounting hole are formed in the mounting plate, when the movable rod is located at the first position, the other part of the ball is located in the first arc-shaped hole, and when the movable rod is located at the second position, the other part of the ball is located in the second arc-shaped hole;

a support spring is further arranged in the ball mounting hole, one end of the support spring abuts against the inner wall of the ball mounting hole, and the other end of the support spring abuts against the ball;

the shopping cart further comprises: a first unlocking device and a second unlocking device, the first unlocking device comprising: the mounting plate is provided with a first mounting hole and a second mounting hole which are mutually communicated, the first arc-shaped hole is communicated with the first mounting hole, the second mounting hole extends to the side wall of the mounting plate, the first end of the first pin is positioned in the second mounting hole, a first inclined plane is arranged on the first end of the first pin, the second end of the first pin extends out of the mounting plate, the first end of the second pin is positioned in the first mounting hole, the second end of the second pin is positioned in the second mounting hole, a second inclined plane matched with the first inclined plane is arranged on the first end of the second pin, the first pin is configured to drive the second pin to move towards the direction of the first arc-shaped hole through the matching of the first inclined plane and the second inclined plane,

the structure of the second unlocking device is the same as that of the first unlocking device;

install the limiting plate on the mounting panel, the limiting plate covers on the second mounting hole, set up on the limiting plate with the spacing hole of diameter matched with of first round pin axle, the middle part of first round pin axle is arranged in spacing hole, be provided with the button on the first end of first round pin axle, just the button is arranged the top of limiting plate, the button with be provided with reset spring between the limiting plate, first round pin epaxial be provided with the spacing bulge loop of limiting plate matched with, spacing bulge loop is arranged the below of limiting plate.

2. The shopping trolley as claimed in claim 1, wherein a pulley is rotatably mounted on the second end of the push rod, a slide rail matched with the pulley is provided on the outer wall of the movable rod, the slide rail is arranged along the length direction of the movable rod, and two ends of the slide rail are respectively provided with a baffle.

3. The shopping cart of claim 1 further comprising a mounting shaft, said mounting shaft being fixed to said two mounting plates, said mounting shaft having two bearings mounted at opposite ends thereof, said movable rod being mounted on said bearings in a sleeved manner at a middle portion thereof.

4. The shopping cart of claim 3 wherein each of said bearings is covered with a bearing cap.