CN218400624U

CN218400624U - Shopping cart frame

Info

Publication number: CN218400624U
Application number: CN202223075141.9U
Authority: CN
Inventors: 刘顶山
Original assignee: Zhongshan Fengshuo Daily Products Co ltd
Current assignee: Zhongshan Fengshuo Daily Products Co ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-01-31
Anticipated expiration: 2032-11-18

Abstract

The utility model discloses a shopping cart frame, when it folds up, the user operates first unlocking mechanism and effects the unblock of first locking structure, be about to push-and-pull rod lower extreme and carry out the unblock, it uses the connection axis of sliding seat and preceding foot bar rear end to rotate forward down to act on the push-and-pull rod at this moment, even the push-and-pull rod draws close to one side of preceding foot bar, simultaneously preceding foot bar is under the effect of push-and-pull rod, the connection axis of preceding foot bar front portion of connecting rod and connecting rod front portion rotates to draw close to one side of connecting rod by the connecting rod rear portion, when waiting that push-and-pull rod, preceding foot bar and connecting rod draw close to each other, accomplish the work of folding up to the frame wholly; therefore, the utility model discloses can realize that the frame folds up fast or expandes the work, and the whole occupation space of the frame after folding up is little, convenient to carry, deposit, it is convenient to have, practical reliable characteristics fold up.

Description

Shopping cart frame

[ technical field ] A

The utility model belongs to the technical field of the shopping cart technique and specifically relates to a shopping cart frame.

[ background of the invention ]

At present, people usually use shopping bags to contain articles when shopping in supermarkets or markets, but when more articles are purchased, people carry a bag of articles with hands, and are quite strenuous, and especially people who are far away from the markets need to carry a lot of articles to walk a long way, which is particularly strenuous and hard.

For example, CN217100045U discloses a shopping cart including a cart frame and a container mounted on the cart frame, the cart frame includes a back rest frame, a handle frame, a front wheel frame and a rear wheel frame, the handle frame is fixed with the back rest frame and is located on the upper side of the back rest frame, the front wheel frame is fixed with the back rest frame and is located on the lower side of the back rest frame, and the free end of the front wheel frame extends to the front of the rear wheel frame and is mounted with a front wheel; the back wheel frame is hinged and fixed with the backrest frame, and the free end of the back wheel frame is provided with a back wheel; however, the shopping cart has the problems of poor folding effect and large occupied space after being folded.

Therefore, the present invention has been made in view of the above problems.

[ Utility model ] content

The utility model aims at overcoming the defects of the prior art, providing a shopping cart frame, improving the problems existing in the prior art, and having the characteristics of convenient folding, convenient use, practicality and reliability.

The utility model discloses a realize through following technical scheme:

a shopping cart frame convertible from an unfolded condition to a folded condition, comprising:

the front leg rod 1, the front end of the front leg rod 1 is connected with a front wheel group 11;

the rear end of the rear foot rod 3 is connected with a rear wheel set 31;

the front end of the connecting rod 2 is rotatably connected with the front part of the front foot rod 1, and the rear end of the connecting rod 2 is connected with the front end of the rear foot rod 3;

the rear end of the front foot rod 1 is rotatably connected with the sliding seat 411, and a first locking structure 6 for locking the lower end of the push-pull rod 4 when the frame is in a unfolding state is arranged between the rear end of the connecting rod 2 or the front end of the rear foot rod 3 or between the rear end of the connecting rod 2 and the front end of the rear foot rod 3;

the shopping cart frame further comprises a first unlocking mechanism 63 for unlocking the first locking structure 6 to unlock the push-pull rod 4 from the locked state.

According to the shopping cart frame, the front end of the rear foot rod 3 is rotatably connected with the rear end of the connecting rod 2; the sliding seat 411 is rotatably connected with a linkage rod 5, and the other end of the linkage rod 5 is rotatably connected with the rear end of the connecting rod 2 or the front end of the rear foot rod 3 so as to enable the rear wheel set 31 and the front wheel set 11 to be closed oppositely when the shopping cart frame is folded.

As mentioned above, the rear end of the connecting rod 2 is provided with the adjusting structure 7 for adjusting the distance between the front wheel set 11 and the rear wheel set 31 to adjust the included angle between the push-pull rod 4 and the horizontal plane.

According to the shopping cart frame, the fixed sleeve 21 is fixedly connected to the rear end of the connecting rod 2, and the lower end of the linkage rod 5 is rotatably connected with the fixed sleeve 21; the adjusting structure 7 comprises an adjusting groove 71 which is arranged on the fixing sleeve 21 and can allow the front end of the rear foot rod 3 to extend into and be rotatably connected with the fixing sleeve 21, and a first adjusting notch 711 and a second adjusting notch 712 which are arranged at the edge of the opening part of the adjusting groove 71 and are arranged at intervals; the adjusting structure 7 further includes an adjusting slider 72 slidably disposed in the rear foot bar 3, and an adjusting lock rod 723 relatively fixedly disposed on the adjusting slider 72 and adjustably engaged with the first adjusting notch 711 or the second adjusting notch 712, and an adjusting slider spring 721 is disposed between the adjusting slider 72 and the rear foot bar 3.

According to the shopping cart frame, the fixing sleeve 21 is fixedly connected to the rear end of the connecting rod 2; the first locking structure 6 comprises a first locking hole 61 arranged on the fixing sleeve 21 and a first locking block 62 which is slidably arranged in the push-pull rod 4 and can be inserted into the first locking hole 61 to lock the push-pull rod 4 relative to the connecting rod 2, and a first spring 621 is arranged between the first locking block 62 and the push-pull rod 4; the first unlocking mechanism 63 includes a first unlocking block 631 movably disposed on the push-pull rod 4 and a first unlocking pull rope 632 for connecting the first unlocking block 631 with the first locking block 62, and when the first unlocking block 631 drives the first locking block 62 to slide upwards relative to the push-pull rod 4 through the first unlocking pull rope 632, the locking end of the first locking block 62 exits the first locking hole 61 to unlock the locking state of the push-pull rod 4.

As for the shopping cart frame, the fixing sleeve 21 is provided with the positioning sleeve 22 which can be matched with the push-pull rod 4 for limiting so as to ensure that the first locking block 62 is aligned with the first locking hole 61, the side wall of the positioning sleeve 22 is provided with an avoiding notch 221 for avoiding the push-pull rod 4, and the first locking hole 61 is located in the positioning sleeve 22.

As mentioned above, the fixing sleeve 21 is provided with a fixing sleeve inclined wall 211 near the first locking hole 61, and the locking end of the first locking block 62 is provided with a locking block inclined wall 622 capable of cooperating with the fixing sleeve inclined wall 211 to retract the first locking block 62 relative to the push-pull rod 4.

The shopping cart frame as described above, the push-pull rod 4 includes a lower push rod 41 and an upper pull rod 42 rotatably connected to the upper end of the lower push rod 41, a second locking structure 43 for locking the upper pull rod 42 relative to the lower push rod 41 and a second unlocking mechanism 44 for unlocking the second locking structure 43 to release the locking state of the upper pull rod 42 relative to the lower push rod 41 are disposed between the upper end of the lower push rod 41 and the lower end of the upper pull rod 42; the first locking structure 6 is arranged between the lower end of the lower push rod 41 and the rear end of the connecting rod 2, the first unlocking mechanism 63 is arranged on the upper pull rod 42, and when the upper pull rod 42 rotates relative to the lower push rod 41 and is folded, the first locking structure 6 is unlocked.

A shopping cart frame as described above further comprising a third locking structure 8 for braking the rear wheel set 31 and a third unlocking mechanism 83 for unlocking the third locking structure 8 to release the braked state of the rear wheel set 31.

The shopping cart frame as described above, the rear wheel set 31 includes a rear wheel 311 rotatably connected to the rear end of the rear foot bar 3; the third locking structure 8 comprises third locking holes 81 circumferentially arranged on the rear wheel 311 at intervals and a third locking pin 82 slidably arranged at the rear end of the rear foot bar 3 and capable of being inserted into the third locking holes 81 to lock the rear wheel 311, and a third spring 821 is arranged between the third locking pin 82 and the rear foot bar 3; the third unlocking mechanism 83 includes a third unlocking block 831 rotatably disposed on the push-pull rod 4 and a third unlocking rope 832 for connecting the third unlocking block 831 with the third locking pin 82, and when the third unlocking block 831 rotates upward relative to the push-pull rod 4, the third unlocking block 831 drives the third locking pin 82 to slide laterally relative to the rear end of the rear foot rod 3 through the third unlocking rope 832 so that the locking end of the third locking pin 82 exits the third locking hole 81 to unlock the locked state of the rear wheel 311.

Compared with the prior art, the utility model has the advantages of as follows:

1. the utility model discloses when folding up, the user operates the unblock of first locking structure of first release mechanism effect, be about to push-and-pull rod lower extreme unblock, effect push-and-pull rod and use the axis of connection of sliding seat and preceding foot bar rear end to rotate down forward as the axis of rotation this moment, even push-and-pull rod draws close to preceding foot bar one side, preceding foot bar is under the push-and-pull rod effect simultaneously, preceding foot bar rear portion uses the axis of connection of connecting rod front end and preceding foot bar front portion to rotate to connecting rod one side and draws close to as the axis of rotation, when treating that push-and-pull rod, preceding foot bar and connecting rod draw close each other, accomplish the work of folding up to the frame wholly; when expanding the use, the user operates the push-and-pull rod and uses the axis of connection of sliding seat and preceding foot pole rear end to up rotate backward as the axis of rotation, even the push-and-pull rod is relative before the foot pole rotates and expandes, at above-mentioned in-process, the push-and-pull rod drives preceding foot pole rear portion and uses connecting rod front end and preceding anterior axis of connection of foot pole to up forward rotation for the axis of rotation, until first locking structure with the relative connecting rod locking of push-and-pull rod lower extreme, the completion is to the whole work of expanding of frame, for this reason the utility model discloses can realize that the frame folds up or expandes the work fast, and the whole occupation space of frame after folding up is little, is convenient for carry, deposits, has and it is convenient, practical reliable characteristics to fold up.

2. In order to facilitate folding and ensure that the overall size of the folded frame is relatively small, the front end of the rear foot rod is rotatably connected with the rear end of the connecting rod; the trolley is characterized in that a linkage rod is rotatably connected to the sliding seat, and the other end of the linkage rod is rotatably connected with the rear end of the connecting rod or the front end of the rear foot rod so that the rear wheel set and the front wheel set are oppositely closed when the trolley frame is folded.

3. The utility model discloses a vehicle frame, including frame, connecting rod, push-pull rod, horizontal plane, connecting rod rear end, frame, push-pull rod, horizontal plane, the frame is equipped with and is used for adjusting the regulation structure of interval in order to adjust contained angle between push-pull rod and the horizontal plane between front wheelset and the back wheelset, can let the frame switch under push-type and the formula state of drawing, so that the user can select the most suitable user state of frame according to the in-service use demand, bring good use experience for the user, the practicality is high, be in the expansion state and support when leaning on the object and leaning on to place with outer such as wall in addition at the frame, through the contained angle of adjusting the relative horizontal plane of push-pull rod, can make the frame whole laminate with the wall more, reduce occupation space, and is practical.

4. The fixed sleeve is provided with a positioning sleeve which can be matched with the push-pull rod to limit so as to ensure that the first locking block is aligned with the first locking hole, when the frame is transformed from a folding state to an unfolding state, the positioning sleeve is matched with the lower end of the push-pull rod, the lower end of the push-pull rod is ensured to be positioned above the first locking hole, the first locking block is ensured to be accurately inserted into the first locking hole, the frame is convenient to unfold, the design is reasonable, the inner wall of the positioning sleeve is abutted against the outer wall of the push-pull rod, the connection stability and the connection strength between the push-pull rod and the fixed sleeve can be improved, and the frame is safe and reliable.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, in which:

fig. 1 is one of perspective views of the present invention in the unfolded state.

Fig. 2 is a second perspective view of the present invention in the unfolded state.

Fig. 3 is a side view of the upper pull rod of the present invention when it is unfolded relative to the lower pull rod.

Fig. 4 is a side view of the upper pull rod of the present invention in the process of rotating and folding the lower pull rod relatively.

Fig. 5 is a side view of the upper pull rod of the present invention when the lower pull rod is folded relatively.

Fig. 6 is a perspective view of the utility model in a folded state.

Fig. 7 is a side view of the utility model in a folded state.

Fig. 8 is a side view of the adjusting lock rod of the present invention engaged with the second adjusting notch.

Fig. 9 is an exploded view of the first locking structure of the present invention.

Fig. 10 is an exploded view of the adjustment structure of the present invention.

Fig. 11 is an exploded view of a second locking structure of the present invention.

Fig. 12 is an exploded view of a third locking structure of the present invention.

Fig. 13 is an exploded view of the third unlocking mechanism of the present invention.

[ detailed description ] A

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-13, the present invention relates to a shopping cart frame, which can be changed from an unfolded state to a folded state, comprising:

the rear end of the rear foot rod 3 is connected with a rear wheel set 31;

the rear end of the front foot rod 1 is rotatably connected with the sliding seat 411, and a first locking structure 6 for locking the lower end of the push-pull rod 4 when the frame is in a spreading state is arranged between the rear end of the connecting rod 2 or the front end of the rear foot rod 3 or between the rear end of the connecting rod 2 and the front end of the rear foot rod 3;

the shopping cart frame further comprises a first unlocking mechanism 63 for unlocking the first locking structure 6 to unlock the push-pull rod 4 from the locked state. The utility model discloses when folding up, the user operates the unblock of first locking structure of first release mechanism effect, be about to push-and-pull rod lower extreme unblock, effect push-and-pull rod and use the axis of connection of sliding seat and preceding foot bar rear end to rotate down forward as the axis of rotation this moment, even push-and-pull rod draws close to preceding foot bar one side, preceding foot bar is under the push-and-pull rod effect simultaneously, preceding foot bar rear portion uses the axis of connection of connecting rod front end and preceding foot bar front portion to rotate to connecting rod one side and draws close to as the axis of rotation, when treating that push-and-pull rod, preceding foot bar and connecting rod draw close each other, accomplish the work of folding up to the frame wholly; when expanding the use, the user operates the push-and-pull rod and uses the axis of connection of sliding seat and preceding foot pole rear end to up rotate backward as the axis of rotation, even the push-and-pull rod is relative before the foot pole rotates and expandes, at above-mentioned in-process, the push-and-pull rod drives preceding foot pole rear portion and uses connecting rod front end and preceding anterior axis of connection of foot pole to up forward rotation for the axis of rotation, until first locking structure with the relative connecting rod locking of push-and-pull rod lower extreme, the completion is to the whole work of expanding of frame, for this reason the utility model discloses can realize that the frame folds up or expandes the work fast, and the whole occupation space of frame after folding up is little, is convenient for carry, deposits, has and it is convenient, practical reliable characteristics to fold up.

As shown in fig. 1-8, in order to facilitate folding and make the overall size of the folded frame relatively small, the front end of the rear foot bar 3 is rotatably connected with the rear end of the connecting bar 2; the sliding seat 411 is rotatably connected with a linkage rod 5, and the other end of the linkage rod 5 is rotatably connected with the rear end of the connecting rod 2 or the front end of the rear foot rod 3 so as to enable the rear wheel set 31 and the front wheel set 11 to be closed oppositely when the shopping cart frame is folded. In the process of folding the frame, the sliding seat 411 slides upwards along the push-pull rod, and then the linkage rod 5 drives the rear end of the connecting rod 2 or the front end of the rear foot rod 3 to move upwards, so that the rear wheel set 31 and the front wheel set 11 are closed towards each other; in the process of unfolding the frame, the sliding seat 411 slides downwards along the push-pull rod, and then the linkage rod 5 drives the rear end of the connecting rod 2 or the front end of the rear foot rod 3 to move downwards, so that the frame can be unfolded conveniently even if the rear wheel set 31 and the front wheel set 11 are away from each other.

As shown in fig. 1-10, the rear end of the connecting rod 2 is provided with an adjusting structure 7 for adjusting the distance between the front wheel set 11 and the rear wheel set 31 to adjust the included angle between the push-pull rod 4 and the horizontal plane, so that the frame can be switched between a push state and a pull state, and a user can select the most appropriate use state of the frame according to actual use requirements, thereby bringing good use experience to the user.

As shown in fig. 1-10, the rear end of the connecting rod 2 is fixedly connected with a fixing sleeve 21, and the lower end of the linkage rod 5 is rotatably connected with the fixing sleeve 21; the adjusting structure 7 comprises an adjusting groove 71 which is arranged on the fixing sleeve 21 and can allow the front end of the rear foot rod 3 to extend into and be rotatably connected with the fixing sleeve 21, and a first adjusting notch 711 and a second adjusting notch 712 which are arranged at the edge of the opening part of the adjusting groove 71 and are arranged at intervals; the adjusting structure 7 further includes an adjusting slider 72 slidably disposed in the rear foot rod 3, and an adjusting lock rod 723 relatively fixedly disposed on the adjusting slider 72 and in adjusting cooperation with the first adjusting notch 711 or the second adjusting notch 712, and an adjusting slider spring 721 is disposed between the adjusting slider 72 and the rear foot rod 3. During adjustment, a user operates the rear foot rod 3 to rotate relative to the connecting rod 2, so that the adjusting lock rod 723 can be correspondingly clamped with the first adjusting notch 711 or the second adjusting notch 712, as shown in fig. 1-5, a schematic diagram of a state when the adjusting lock rod 723 is clamped with the first adjusting notch 711 is shown, and as shown in fig. 8, a schematic diagram of a state when the adjusting lock rod 723 is clamped with the second adjusting notch 712 is shown. In addition, an adjusting slider spring 721 is arranged between the adjusting slider 72 and the rear foot bar 3, so that the adjusting lock rod 723 can be ensured to be stably clamped with the first adjusting notch 711 or the second adjusting notch 712; through adjusting the anterior spacing cooperation of recess 71 and back foot pole 3 in this embodiment, can only let back foot pole 3 at the rotation of predetermineeing rotation range internal rotation and back foot pole 3 can only rotate along setting for the direction, ensure joint strength and connection stability between back foot pole 3 and the connecting rod 2 simultaneously.

As shown in fig. 1-9, the rear end of the connecting rod 2 is fixedly connected with a fixing sleeve 21; the first locking structure 6 comprises a first locking hole 61 arranged on the fixing sleeve 21 and a first locking block 62 which is slidably arranged in the push-pull rod 4 and can be inserted into the first locking hole 61 to lock the push-pull rod 4 relative to the connecting rod 2, and a first spring 621 is arranged between the first locking block 62 and the push-pull rod 4; the first unlocking mechanism 63 includes a first unlocking block 631 movably disposed on the push-pull rod 4 and a first unlocking pull rope 632 for connecting the first unlocking block 631 with the first locking block 62, and when the first unlocking block 631 drives the first locking block 62 to slide upward relative to the push-pull rod 4 through the first unlocking pull rope 632, the locking end of the first locking block 62 exits the first locking hole 61 to unlock the locking state of the push-pull rod 4. During unlocking, a user operates the first unlocking block 631 to move relative to the upper pull rod 42, and then drives the first locking block 62 to slide upwards relative to the lower push rod 41 through the first unlocking pull rope 632 until the locking end of the first locking block 62 exits from the first locking hole 61, and at the moment, the push-pull rod 4 can move relative to the connecting rod 2, so that the frame is unlocked; the first spring 621 in this embodiment is provided between the upper end of the first lock block 62 and the lower push rod 41, and can push the first lock block 62 to be inserted into the first lock hole 61. In addition, an unlocking block spring is arranged between the first unlocking block 631 and the upper pull rod 42, and when the first unlocking block 631 does not exert an external force, the unlocking block spring pushes the first unlocking block 631 to slide and reset relative to the upper pull rod 42.

As shown in fig. 1 to 10, the fixing sleeve 21 is provided with a positioning sleeve 22 capable of being matched with the push-pull rod 4 for limiting so as to ensure that the first locking block 62 is aligned with the first locking hole 61, the side wall of the positioning sleeve 22 is provided with an avoiding notch 221 for avoiding the push-pull rod 4, and the first locking hole 61 is located in the positioning sleeve 22. When the frame is changed from a folding state to an unfolding state, the positioning sleeve is matched with the lower end of the push-pull rod, the lower end of the push-pull rod is ensured to be positioned above the first locking hole, the first locking block is ensured to be accurately inserted into the first locking hole, the frame is convenient to unfold and reasonable in design, meanwhile, the inner wall of the positioning sleeve is abutted against the outer wall of the push-pull rod, the connection stability and the connection strength between the push-pull rod and the fixing sleeve can be improved, and the frame is safe and reliable.

As shown in fig. 1 to 10, the retaining sleeve 21 is provided with a retaining sleeve inclined wall 211 adjacent to the first locking hole 61, and the locking end of the first locking block 62 is provided with a locking block inclined wall 622 capable of engaging with the retaining sleeve inclined wall 211 to retract the first locking block 62 relative to the push-pull rod 4. When the frame is changed from the folded state to the unfolded state, the user operates the push-pull rod to rotate, so that in the process that the lower end of the push-pull rod moves towards the upper part of the first locking hole 61, the locking block inclined wall 622 is matched with the fixing sleeve inclined wall 211 to press the first locking block 62 to retract into the lower push rod, and the phenomenon that the first locking block 62 is interfered to influence the frame unfolding is avoided.

As shown in fig. 1-8 and 11, in order to make the overall folded frame smaller, the push-pull rod 4 includes a lower push rod 41 and an upper pull rod 42 rotatably connected to the upper end of the lower push rod 41, and a second locking structure 43 for locking the upper pull rod 42 with respect to the lower push rod 41 and a second unlocking mechanism 44 for unlocking the second locking structure 43 to release the locking state of the upper pull rod 42 with respect to the lower push rod 41 are provided between the upper end of the lower push rod 41 and the lower end of the upper pull rod 42; the first locking structure 6 is arranged between the lower end of the lower push rod 41 and the rear end of the connecting rod 2, and the first unlocking mechanism 63 is arranged on the upper pull rod 42.

As shown in fig. 11, the second locking structure 43 includes a second left joint 431 disposed at the upper end of the lower push rod 41 and a second right joint 432 disposed at the lower end of the lower pull rod 42 and rotatably connected to the second seat joint 431, a receiving space is provided between the second left joint 431 and the second right joint 432, and an internal gear 433 is disposed in each of the second left joint 431 and the second right joint 432, the second locking structure 43 further includes a second external gear 434 slidably disposed in the receiving space and capable of meshing with the internal gear 433 of the second left joint 431 and the internal gear 433 of the second right joint 432, and a second spring 435 is disposed between the second external gear 434 and the second left joint 431; the second unlocking mechanism 44 is a second unlocking button movably connected to the second right joint 432 and capable of pushing the second external gear 434 to slide toward the second left joint 431.

In the utility model discloses in, first unblock stay cord 632 lower extreme is connected with first locking piece 62, and first unblock stay cord 632 upper end is rich through second external gear 434 and is connected with first unblock piece 631, treats when upper link 42 rotates to fold up relatively push rod 41, the unblock of first locking structure 6, as shown in fig. 4.

As shown in fig. 1 to 8, 12 and 13, for braking convenience, a third locking structure 8 for braking the rear wheel set 31 and a third unlocking mechanism 83 for unlocking the third locking structure 8 to release the braking state of the rear wheel set 31 are further included.

As shown in fig. 1-8, 12 and 13, for easy operation, the rear wheel set 31 includes a rear wheel 311 rotatably connected to the rear end of the rear leg bar 3; the third locking structure 8 comprises a third locking hole 81 circumferentially arranged on the rear wheel 311 at intervals and a third locking pin 82 slidably arranged at the rear end of the rear foot bar 3 and capable of being inserted into the third locking hole 81 to lock the rear wheel 311, and a third spring 821 is arranged between the third locking pin 82 and the rear foot bar 3; the third unlocking mechanism 83 includes a third unlocking block 831 rotatably disposed on the push-pull rod 4 and a third unlocking rope 832 for connecting the third unlocking block 831 with the third locking pin 82, and when the third unlocking block 831 rotates upward relative to the push-pull rod 4, the third unlocking block 831 drives the third locking pin 82 to slide laterally relative to the rear end of the rear foot rod 3 through the third unlocking rope 832 so that the locking end of the third locking pin 82 exits the third locking hole 81 to unlock the locked state of the rear wheel 311.

As shown in fig. 13, a third locking assembly 84 capable of locking the third unlocking block 831 when the third unlocking block 831 rotates upward relative to the push-pull rod 4 to unlock the third locking structure 8 is disposed between the third unlocking block 831 and the upper end of the lower push rod 41, so as to ensure that the third locking structure 8 is in an unlocked state, and prevent the third locking structure 8 from braking the rear wheel 311 during the driving process of the vehicle frame, thereby ensuring that the vehicle frame is normally driven.

As shown in fig. 13, the third locking assembly 84 preferably includes a locking through-hole 841 formed in the third unlocking block 831 and a locking spring 842 elastically coupled to the push-pull rod 4 and capable of being snapped into the locking through-hole 841 to lock the third unlocking block 831 with respect to the push-pull rod 4.

For the convenience of unlocking, an unlocking key 843 is slidably connected to the third unlocking block 831, one end of the unlocking key 843 extends into the locking through hole 841 and abuts against the locking marble 842, and the other end of the unlocking key 843 is located outside the locking through hole 841.

Claims

1. A shopping cart frame convertible from an unfolded condition to a folded condition, comprising:

the front leg rod (1), the front end of the front leg rod (1) is connected with a front wheel set (11);

the rear end of the rear foot rod (3) is connected with a rear wheel set (31);

the front end of the connecting rod (2) is rotationally connected with the front part of the front foot rod (1), and the rear end of the connecting rod (2) is connected with the front end of the rear foot rod (3);

the frame comprises a push-pull rod (4), a sliding seat (411) is connected to the push-pull rod (4) in a sliding mode, the rear end of a front foot rod (1) is rotatably connected with the sliding seat (411), and a first locking structure (6) used for locking the lower end of the push-pull rod (4) when the frame is in a unfolding state is arranged between the rear end of a connecting rod (2) or the front end of a rear foot rod (3) or between the rear end of the connecting rod (2) and the front end of the rear foot rod (3);

the shopping cart frame further comprises a first unlocking mechanism (63) for unlocking the first locking structure (6) to unlock the push-pull rod (4) in the locked state.

2. Shopping cart frame according to claim 1, characterised in that the front end of the rear foot bar (3) is rotatably connected to the rear end of the connecting rod (2);

the shopping cart is characterized in that a linkage rod (5) is rotatably connected to the sliding seat (411), and the other end of the linkage rod (5) is rotatably connected with the rear end of the connecting rod (2) or the front end of the rear foot rod (3) so that the rear wheel set (31) and the front wheel set (11) are closed in opposite directions when the shopping cart frame is folded.

3. Shopping cart frame according to claim 2, characterised in that the rear end of the connecting rod (2) is provided with an adjusting structure (7) for adjusting the distance between the front wheel set (11) and the rear wheel set (31) to adjust the angle between the push-pull rod (4) and the horizontal plane.

4. The shopping cart frame of claim 3, wherein a fixing sleeve (21) is fixedly connected to the rear end of the connecting rod (2), and the lower end of the linkage rod (5) is rotatably connected with the fixing sleeve (21);

the adjusting structure (7) comprises an adjusting groove (71) which is arranged on the fixed sleeve (21) and can allow the front end of the rear foot rod (3) to extend into and be rotatably connected with the fixed sleeve (21), and a first adjusting notch (711) and a second adjusting notch (712) which are arranged on the edge of the opening part of the adjusting groove (71) and are arranged at intervals;

the adjusting structure (7) further comprises an adjusting sliding block (72) which is slidably arranged in the rear foot rod (3) and an adjusting locking rod (723) which is relatively fixedly arranged on the adjusting sliding block (72) and is matched with the first adjusting notch (711) or the second adjusting notch (712) in an adjusting mode, and an adjusting sliding block spring (721) is arranged between the adjusting sliding block (72) and the rear foot rod (3).

5. Shopping cart frame according to any of claims 1-4, characterised in that a fixing sleeve (21) is fixedly connected to the rear end of the connecting rod (2);

the first locking structure (6) comprises a first locking hole (61) arranged on the fixed sleeve (21) and a first locking block (62) which is slidably arranged in the push-pull rod (4) and can be inserted into the first locking hole (61) to lock the push-pull rod (4) relative to the connecting rod (2), and a first spring (621) is arranged between the first locking block (62) and the push-pull rod (4);

first release mechanism (63) including movably establish first unblock piece (631) on push-and-pull rod (4) and be used for first unblock stay cord (632) of being connected first unblock piece (631) and first locking piece (62), when first unblock piece (631) drive first locking piece (62) relative push-and-pull rod (4) upwards slip through first unblock stay cord (632), the locking end of first locking piece (62) withdraws from first locking hole (61) in order to relieve the locking state of push-and-pull rod (4).

6. The shopping cart frame as claimed in claim 5, wherein the fixing sleeve (21) is provided with a positioning sleeve (22) which can be matched with the push-pull rod (4) for limiting so as to ensure that the first locking block (62) is aligned with the first locking hole (61), the side wall of the positioning sleeve (22) is provided with an avoiding notch (221) for avoiding the push-pull rod (4), and the first locking hole (61) is positioned in the positioning sleeve (22).

7. Shopping cart frame as claimed in claim 5, wherein the retaining sleeve (21) is provided with a retaining sleeve inclined wall (211) adjacent the first locking hole (61), and the locking end of the first locking piece (62) is provided with a locking piece inclined wall (622) capable of engaging with the retaining sleeve inclined wall (211) to retract the first locking piece (62) relative to the push-pull rod (4).

8. The shopping cart frame according to claim 1, wherein the push-pull rod (4) comprises a lower push rod (41) and an upper pull rod (42) rotatably connected with the upper end of the lower push rod (41), a second locking structure (43) for locking the upper pull rod (42) relative to the lower push rod (41) and a second unlocking mechanism (44) for unlocking the second locking structure (43) to release the locking state of the upper pull rod (42) relative to the lower push rod (41) are arranged between the upper end of the lower push rod (41) and the lower end of the upper pull rod (42);

the first locking structure (6) is arranged between the lower end of the lower push rod (41) and the rear end of the connecting rod (2), and the first unlocking mechanism (63) is arranged on the upper pull rod (42).

9. Shopping cart frame according to claim 1, further comprising a third locking structure (8) for braking the rear wheel set (31) and a third unlocking mechanism (83) for unlocking the third locking structure (8) to release the braking state of the rear wheel set (31).

10. Shopping cart frame according to claim 9, characterised in that the rear wheel group (31) comprises a rear wheel (311) rotatably connected to the rear end of the rear foot bar (3);

the third locking structure (8) comprises third locking holes (81) which are circumferentially arranged on the rear wheel (311) at intervals and a third locking pin (82) which is slidably arranged at the rear end of the rear foot rod (3) and can be inserted into the third locking holes (81) to lock the rear wheel (311), and a third spring (821) is arranged between the third locking pin (82) and the rear foot rod (3);

the third unlocking mechanism (83) comprises a third unlocking block (831) and a third unlocking pull rope (832) which is rotatably arranged on the push-pull rod (4) and used for connecting the third unlocking block (831) with the third locking pin (82), and when the third unlocking block (831) rotates upwards relative to the push-pull rod (4), the third unlocking block (831) drives the third locking pin (82) to transversely slide relative to the rear end of the rear foot rod (3) through the third unlocking pull rope (832) so that the locking end of the third locking pin (82) can exit from the third locking hole (81) to unlock the locking state of the rear wheel (311).