CN111776052A - An easy-to-fold trolley - Google Patents

Abstract

The invention discloses a handcart convenient to fold, which comprises a rear foot tube, a first joint component arranged at the upper end of the rear foot tube, a front foot tube with the upper end connected with the first joint component, a handle tube with the lower end connected with the first joint component, a seat frame and a rear supporting tube, wherein the handle tube is provided with a third joint component, the lower end of the rear supporting tube or the second joint component extends to the seat frame to form a tilting part which can swing along with the supporting tube, the tilting part is pivotally connected with the rear end of the seat frame, when the rear supporting tube is folded and unfolded relative to the rear foot tube, the seat frame can be driven to swing by the tilting part, and the seat frame drives the front foot tube to swing between positions where the rear foot tube is completely folded or unfolded. The handcart does not need an operator to additionally fold the front foot tubes towards the rear foot tubes in the whole process, so that the handcart is more convenient to fold and has smaller integral volume after being folded.

Description

An easy-to-fold trolley

technical field

The invention relates to the technical field of baby products, in particular to a trolley which is easy to fold.

Background technique

In order to facilitate transportation and storage, many trolleys on the market currently adopt a foldable structure. Only by unlocking the joints, the frame of the trolley can be folded and folded to reduce the size of the trolley; the unlock switch of the traditional trolley is set at At each joint, after unlocking the connecting joints at the same time, the front leg tube and the rear leg tube cannot be folded and folded together or cannot be fully folded after being folded (that is, there is a large angle between the two). Auxiliary collapsing. Therefore, the folding operation is relatively inconvenient, and the folded volume is still relatively large.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a trolley which is easy to fold, aiming to make the folding and folding operation of the trolley more convenient.

In order to achieve the above-mentioned purpose, the present invention proposes a foldable trolley, which includes a rear leg tube, a first joint assembly mounted on the upper end of the rear leg tube, a front leg tube whose upper end is connected with the first joint assembly, and a hand trolley whose lower end is connected with the first joint assembly. The handle tube, the seat frame and the rear support tube are provided with a third joint assembly, the front part of the seat frame is pivotally connected to the front leg tube, the upper end of the rear support tube is pivotally connected to the third joint assembly, and the rear support tube The lower end is pivotally connected with the rear leg tube directly or through the second joint assembly, and the lower end of the rear support tube or the second joint assembly extends to the seat frame with an upturned portion that can then swing the support tube, and the upturned portion is connected to the rear end of the seat frame. It can be pivotally connected. When the rear support tube is folded and unfolded relative to the rear leg tube, the seat frame can be driven to swing by the upturned part, and the front leg tube can be driven by the seat frame to swing to the position where the rear leg tube is fully folded or fully unfolded. .

The technical solution of the present invention is that the upper end of the rear support tube is pivotally connected to the third joint assembly, the lower end of the rear support tube is connected to the rear leg tube directly or through the second joint assembly, and the front part of the seat frame is pivotally installed on the The front leg tube, and the lower end of the rear support tube or the second joint assembly is provided with an upturned portion extending to the rear end of the seat frame to be pivotally connected, so that the rear support tube forms a linkage relationship with the front leg tube through the seat frame, When the trolley is in the unfolded state, the third joint assembly is locked by the corresponding locking device, the handle tube and the rear support tube cannot be folded relative to the rear leg tube, and the trolley remains unfolded. When it needs to be folded, first operate the corresponding unlocking button to release the lock of the main locking device on the third joint assembly, and then press down the handle tube to drive the rear support tube to sway in the direction of the rear leg tube, and make the upturned part drive The seat frame swings up to release the balance between the front leg tube, rear leg tube, seat frame and rear support tube; then, continue to press down on the handlebar tube or release the handlebar tube so that the handlebar tube and the rear support tube are under gravity. Under the action of the rear leg tube, the seat frame pulls the front leg tube under the cooperation of the front wheel (that is, the front wheel rolls in the direction of the rear leg tube), and the rear leg tube folds and swings until the whole trolley is completely retracted. During the whole process There is no need for the operator to additionally fold the front leg tube toward the rear leg tube, the folding operation is more convenient, and the overall volume after folding is smaller.

Description of drawings

Fig. 1 is three-dimensional schematic diagram one of the present invention;

Fig. 2 is three-dimensional schematic diagram two of the present invention;

Figure 3 is a side view of the present invention;

4 is a schematic diagram of the cooperation of the first joint assembly and the second joint assembly;

FIG. 5 is an exploded view one of the first joint assembly and the second joint group;

6 is an exploded view of the first joint assembly and the second joint group;

FIG. 7 is a schematic perspective view of a warped portion;

FIG. 8 is a three-dimensional schematic diagram of the cooperation of the third joint assembly and the fourth joint assembly;

Figure 9 is an exploded view 1 of a perspective schematic diagram of the third joint assembly;

Fig. 10 is an exploded view 2 of a perspective schematic diagram of the third joint assembly;

Figure 11 is a schematic diagram of the invention of folding.

In the figure: 1 is the first joint assembly, 2 is the second joint assembly, 21 is the second outer joint, 22 is the second inner joint, 201 is the locking groove, 202 is the bayonet, 3 is the third joint assembly, 31 is the The third outer joint, 32 is the third middle joint, 33 is the third inner joint, 341 is the positioning slot, 342 is the positioning column, 351 is the positioning bump, 352 is the positioning groove, 4 is the warped part, 41 is Steps, 51 is the rear leg tube, 52 is the front leg tube, 53 is the handlebar tube, 531 is the handlebar upper tube, 532 is the handlebar lower tube, 54 is the seat frame, 541 is the longitudinal tube, 542 is the support beam, and 543 is the first A pivot part, 55 is the rear support tube, 6 is the fourth joint assembly, and 61 is the extension tube.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, vertical, counterclockwise, clockwise, circumferential direction, radial direction, axial direction, etc.), the directional indication is only used to explain the relative positional relationship, movement situation, etc. When a change occurs, the directional indication also changes accordingly.

In addition, if there is a description related to "first" or "second" in this embodiment of the present invention, the description of "first" or "second" is only for the purpose of description, and should not be understood as an indication or suggestion Its relative importance or implicitly indicates the number of technical features indicated. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

The present invention provides a trolley which is easy to fold.

In the embodiment of the present invention, as shown in FIGS. 1 to 11 , the foldable trolley includes a rear leg tube 51 and a first joint assembly 1 mounted on the upper end of the rear leg tube 51 , and the upper end is connected to the first joint assembly 1 and can be opposite to the rear leg. The tube 51 unfolds and folds the swinging front leg tube 52, the lower end is connected to the first joint assembly 1 and can unfold and fold the swinging handle tube 53 relative to the rear leg tube 51, the seat frame 54 and the rear support tube 53. The lower end is equipped with a rear wheel, the lower end of the front leg tube 52 is equipped with a front wheel, the handle tube 53 is provided with a third joint assembly 3, the front part of the seat frame 54 is pivotally connected to the front leg tube 52, and the upper end of the rear support tube 53 is connected to the front leg tube 52. The third joint assembly 3 is pivotally connected, and the lower end of the rear support tube 53 is pivotally connected to the rear leg tube 51 directly or through the second joint assembly 2 and can swing relative to the rear leg tube 51. The lower end of the rear support tube 53 or the second joint assembly 2. Extending toward the seat frame 54 is a raised portion 4 that can swing the support tube 53 subsequently, and the raised portion 4 is pivotally connected to the rear end of the seat frame 54. When the rear support tube 53 is folded and unfolded relative to the rear leg tube 51, it swings , the seat frame 54 can be driven to swing by the upturned portion 4 , and the front leg tube 52 can be driven by the seat frame 54 to swing to the position where the rear leg tube 51 is fully folded or fully unfolded.

In the present invention, the upper end of the rear support tube 53 is pivotally connected with the third joint assembly 3, the lower end of the rear support tube 53 is connected with the rear leg tube 51 directly or through the second joint assembly 2, and the front part of the seat frame 54 is pivotable It is rotatably mounted on the front leg tube 52, and the lower end of the rear support tube 53 or the second joint assembly 2 is provided with an upturned portion 4 extending to the rear end of the seat frame 54 to be pivotally connected, so that the rear support tube 53 can pass through the seat The frame 54 forms a linkage relationship with the front leg tube 52. When the trolley is in the unfolded state, the third joint assembly 3 is locked by the corresponding locking device, the handle tube 53 and the rear support tube 53 cannot be folded relative to the rear leg tube 51, and the trolley remains unfolded. . When it needs to be folded, first operate the corresponding unlocking button to release the locking of the third joint assembly 3 by the locking device, and then press down the handle tube 53 to drive the rear support tube 53 to sway in the direction in which the rear leg tube 51 is folded, and lift the handle tube 53 down. The upturned portion 4 drives the seat frame to swing upward to release the balance relationship between the front leg tube 52, the rear leg tube 51, the seat frame and the rear support tube 53; then, continue to press down the handle tube 53 or release the handle tube 53 to The handle tube 53 and the rear support tube 53 are folded and swung towards the rear leg tube 51 under the action of gravity, and the front leg tube 52 is pulled by the seat frame 54 under the cooperation of the front wheel (that is, the front wheel rolls in the direction of the rear leg tube 51). The tube 51 is folded and swung until the whole trolley is completely folded, and the operator does not need to additionally fold the front leg tube 52 to the rear leg tube 51 during the whole process, the folding operation is more convenient, and the overall volume after folding is smaller.

In the embodiment of the present invention, the handlebar tube 53 includes a handlebar lower tube 532 whose lower end is connected with the first joint assembly 1 , and is connected to the upper end of the handlebar lower tube 532 through the third joint assembly 3 and can be unfolded relative to the handlebar lower tube 532 And the upper tube 531 of the folded and swinging handlebar.

When it needs to be folded, first operate the corresponding unlocking button to release the locking of the locking device to the third joint assembly 3, and then turn the handle upper tube 531 to the handle lower tube 532 counterclockwise relative to the third joint assembly 3 (as shown in FIG. 3 ). Then press down the handle upper tube 531 and the handle lower tube 532 to drive the rear support tube 53 to sway in the direction in which the rear leg tube 51 is folded, and make the upturned part 4 drive the seat frame to swing up, so as to Release the balance between the front leg tube 52, the rear leg tube 51, the seat frame and the rear support tube 53; The lower tube 532 and the rear support tube 53 are folded and swung towards the rear leg tube 51 under the action of gravity, and the front leg tube 52 is pulled by the seat frame 54 under the cooperation of the front wheel (that is, the front wheel rolls in the direction of the rear leg tube 51) to the rear leg tube. 51 is folded and swung until the whole trolley is completely folded, and the fully folded trolley can be supported by the front and rear wheels to stand on the ground, so as to further reduce the overall volume of the folded trolley.

In the embodiment of the present invention, the seat frame 54 includes two longitudinal tubes 541 spaced left and right, a support beam 542 connected between the two longitudinal tubes 541 , and a first pivoting portion inserted at the rear end of the longitudinal tubes 541 543, the front part of the longitudinal tube 541 can be pivotally connected to the front foot tube 52, preferably, the front part of the first pivot part 543 is inserted into the longitudinal tube 541 and fixed with the longitudinal tube 541 by screws or rivets, the first pivot The rear part of the rotating part 543 is curved downward in an arc shape, the inner side of the upturned part 4 is provided with a step 41 in the direction toward the center of the trolley, and the rear end of the first pivoting part 543 can be pivotally installed (such as by bolts or When the trolley is fully deployed, the rear side wall of the first pivot portion 543 abuts against the rear side wall of the step 41 to limit the swing of the seat frame 54 .

In the embodiment of the present invention, the second joint assembly 2 includes a second outer joint 21 fixedly mounted on the rear leg tube 51 , a second inner joint 22 pivotally mounted on the second outer joint 21 , and the second inner joint 22 The upturned portion 4 extends toward the seat frame 54 , the seat frame 54 is extended with a first pivot portion 543 rearward, and the upturned portion 4 and the first pivotal portion 543 are pivotally connected to connect the seat The rear end of the frame 54 is pivotably connected to the raised portion 4 .

In the embodiment of the present invention, the third joint assembly 3 includes a third outer joint 31 , a third middle joint 32 and a third inner joint 33 , and the third inner joint 33 and the third outer joint 31 are pivotally mounted on the third joint respectively. On both sides of the middle joint 32, the third outer joint 31 is connected with the handle upper tube 531, the handle lower tube 532 is connected with the third middle joint 32, the third inner joint 33 is connected with the rear support tube 53, and the third inner joint 33 is connected with the rear support tube 53. A first locking device is provided between the three outer joints 31 and the third middle joint 32 for locking the third outer joint 31 and the third middle joint 32 in the unfolded state, the third inner joint 33 and the third middle joint 32 A second locking device is provided between the joints 32 for locking the third inner joint 33 and the third middle joint 32 in the unfolded state, and another unlocking device is used to release the first locking device to the third outer joint 31 and the third outer joint 31 and the first locking device. The third inner joint 33 and the third middle joint 32 are locked by the three middle joints 32 and the second locking device.

In the embodiment of the present invention, the first locking device, the second locking device and the unlocking device may have various embodiments, such as using the prior art, wherein, in this embodiment, the unlocking device may refer to the patent publication number It is the invention patent of CN206446647 U. Of course, the first locking device and the second locking device may also adopt the following embodiments: as shown in FIG. 4 to FIG. 10 .

In the embodiment of the present invention, the first locking device includes a positioning slot 341 provided on the third outer joint 31, a positioning column 342 and a first return spring that are slidably mounted on the handle upper tube 531. The positioning column 342 can be Slide between a position where the third outer joint 31 and the third middle joint 32 are locked by the positioning slot 341 and a position where the third outer joint 31 and the third middle joint 32 are unlocked by exiting the positioning slot 341, the A return spring is used to apply an elastic force to the positioning post 342 to move to the position where it is locked in the positioning slot 341, and the unlocking device is used to drive the positioning post 342 to move to the position where it exits the positioning slot 341, so that the trolley is in the unfolded state , the positioning post 342 is locked in the positioning slot 341 .

In the embodiment of the present invention, the second locking device includes a positioning protrusion 351 and a second return spring that are slidably installed on the third inner joint 33 and a positioning groove 352 provided on the third middle joint 32. The positioning protrusion 351 can slide between the positions where the positioning groove 352 locks the third inner joint 33 and the third middle joint 32 and exits the positioning groove 352 to unlock the third inner joint 33 and the third middle joint 32, and the second reset The spring is used to apply the elastic force to the positioning protrusion 351 to move to the position where it is locked into the positioning groove 352 (so that the positioning protrusion 351 is locked in the positioning groove 352 when the trolley is in the unfolded state), and the unlocking device is used to drive the positioning protrusion. 351 moves to the position of exiting the positioning groove 352, so as to release the locking of the third inner joint 33 and the third middle joint 32 when the folding hand push is required.

In the embodiment of the present invention, the unlocking device includes an unlocking key provided on the handlebar upper tube 531 , a first retracting rope connecting the unlocking key and the positioning column 342 , and a third connecting the third outer joint 31 and the positioning projection 351 . Two retractable ropes, when the unlock button is pressed, the first retractable rope can be driven to drive the positioning post 342 to slide away from the positioning slot 341, and the third outer joint 31 can be rotated in the retracted direction to drive the second retracted rope to drive the positioning protrusion The block 351 slides away from the positioning groove 352 . The working principle of the unlocking device may refer to the embodiments disclosed in the invention patent with publication number CN 206446647 U.

In the embodiment of the present invention, the third inner joint 33 is connected with an extension tube 61 , and the extension tube and the rear support tube 53 are pivotally connected through the fourth joint assembly 6 . After being completely folded, the rear support tube 53 is substantially parallel to the handlebar lower tube 532, which can reduce the volume of the entire vehicle.

In the embodiment of the present invention, the second joint assembly 2 is provided with a main locking device, which is used to lock the second outer joint 21 and the second inner joint 22 in the unfolded state, and the unlocking device can also be used to release the main locking device. Locking of the outer joint 21 and the second inner joint 22 .

In the embodiment of the present invention, a locking groove 201 is provided on the opposite side of the second outer joint 21 and the second inner joint 22 , and the main locking device includes a bayonet 202 slidably mounted on the second inner joint 22 and a third return spring , the bayonet 202 can be locked in the locking groove 201 to lock the second outer joint 21 and the second inner joint 22 and exit the locking groove 201 to unlock the second outer joint 21 and the second inner joint 22. The third return spring is used to exert an elastic force on the bayonet 202 to move to the position where it is inserted into the locking groove 201, and the unlocking device further includes a second retraction for connecting the bayonet 202 and the third inner joint 33. Rotating the third inner joint 33 in the retracting direction can drive the third retracting rope to drive the detent 202 to slide away from the second outer locking groove 201 .

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformations made by the contents of the description and drawings of the present invention, or the direct/indirect application Other related technical fields are included in the scope of patent protection of the present invention.

Claims (11)

1. A trolley that is easy to fold, comprising a rear leg tube, a first joint assembly mounted on the upper end of the rear leg tube, a front leg tube connected with the first joint assembly at the upper end, a handle tube connected with the first joint assembly at the lower end, a seat frame and The rear support tube and the handle tube are provided with a third joint assembly, which is characterized in that the front part of the seat frame is pivotally connected to the front leg tube, the upper end of the rear support tube is pivotally connected to the third joint assembly, and the lower end of the rear support tube is pivotally connected. Directly or through the second joint assembly to be pivotally connected with the rear leg tube, the lower end of the rear support tube or the second joint assembly extends to the seat frame with an upturned portion that can then swing the support tube, and the upturned portion and the rear end of the seat frame can be swayed. Pivot connection, when the rear support tube is folded and unfolded relative to the rear leg tube, the seat frame can be driven to swing by the upturned part, and the front leg tube can be driven by the seat frame to swing to the position where the rear leg tube is fully folded or fully unfolded. 2. The foldable trolley according to claim 1, wherein the handle tube comprises a handle lower tube whose lower end is connected with the first joint assembly, and a handle which is connected to the upper end of the handle lower tube through a third joint assembly Put on the tube. 3. The easy-to-fold trolley according to claim 1, wherein the seat frame comprises two longitudinal tubes spaced left and right, and a support beam connected between the two longitudinal tubes and inserted into the longitudinal tubes The first pivoting part of the rear end, the front part of the longitudinal tube can be pivotally connected to the front leg tube, the rear part of the first pivoting part is curved downward in an arc shape, the inner side of the upturned part is provided with a step, and the first pivoting part The rear end of the first pivot part can be pivotally mounted on the step, and when the trolley is fully deployed, the rear side wall of the first pivot part is abutted against the rear side wall of the step. 4. The easy-to-fold trolley according to claim 1, wherein the second joint assembly comprises a second outer joint fixedly mounted on the rear leg tube, a second inner joint pivotally mounted on the second outer joint, The upturned portion extends from the second inner joint toward the seat frame, the seat frame is extended with a first pivot portion rearward, and the upturned portion is pivotably connected to the first pivotal portion. 5. The foldable cart according to claim 2, wherein the third joint assembly comprises a third outer joint, a third middle joint and a third inner joint, the third inner joint and the third outer joint are respectively It is pivotally installed on both sides of the third middle joint, the third outer joint is connected with the upper handlebar tube, the lower handlebar tube is connected with the third middle joint, the third inner joint is connected with the rear support tube, and the third A first locking device for locking the third outer joint and the third middle joint is arranged between the outer joint and the third middle joint in the unfolded state, and a first locking device for locking the third outer joint and the third middle joint is arranged between the third inner joint and the third middle joint. The second locking device locks the third inner joint and the third middle joint in the unfolded state, and another unlocking device is used to release the first locking device to the third outer joint and the third middle joint and the second locking device to the third joint. Locking of the three inner joints and the third middle joint. 6. The easy-to-fold trolley according to claim 5, wherein the first locking device comprises a positioning slot set on the third outer joint, a positioning column slidably installed on the handle upper tube and a first reset The spring and the positioning post can slide between a position stuck in the positioning slot and a position withdrawing from the positioning slot, and the first return spring is used to apply an elastic force to the positioning post to move to the position stuck in the positioning slot , the unlocking device is used to drive the positioning column to move to the position where it exits the positioning slot. 7. The easy-to-fold trolley according to claim 6, wherein the second locking device comprises a positioning projection and a second return spring that are slidably installed on the third inner joint, and a positioning block arranged on the third middle joint The positioning protrusion can slide between the position where it is stuck in the positioning groove and the position where it exits the positioning groove. The second return spring is used to apply the elastic force to the positioning protrusion to move from the position where it is stuck in the positioning groove, unlocking The device is used to drive the positioning protrusion to move to the position exiting the positioning groove. 8. The easy-to-fold trolley according to claim 7, wherein the unlocking device comprises an unlocking key provided on the upper tube of the handle, a first retracting rope connecting the unlocking key and the positioning post, and a third The outer joint and the second retracting rope of the positioning bump can drive the first retracting rope to drive the positioning column to slide away from the positioning slot when the unlock button is pressed, and turn the third external joint in the retracting direction to drive the second retracting The vehicle rope drives the positioning protrusion to slide in a direction away from the positioning groove. 9 . The foldable trolley according to claim 9 , wherein the third inner joint is connected with an extension tube, and the extension tube and the rear support tube are pivotally connected through a fourth joint assembly. 10 . 10. The easily foldable trolley according to claim 8, wherein the second joint assembly is provided with a main locking device for locking the second outer joint and the second inner joint in the unfolded state, and the unlocking The device can also be used to unlock the second outer joint and the second inner joint by the primary locking device. 11. The foldable trolley according to claim 10, wherein a locking groove is provided on the opposite side of the second outer joint and the second inner joint, and the main locking device comprises a slidably mounted on the second inner joint. A bayonet and a third return spring, the bayonet can slide between a position locked in the locking groove and a position exiting the locking groove, the third restoring spring is used to apply a force to the bayonet to be locked into the locking groove. The elastic force of the position movement, the unlocking device also includes a connecting pin and the third inner joint is provided with a second retracting rope. Rotating the third inner joint in the retracting direction can drive the third retracting rope to drive the pin to move away from the second retracting rope. The position of the outer locking slot slides.

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