An improved folding cart

Abstract

The invention discloses an improved folding stroller, which comprises a handlebar tube, a front leg tube group, a rear leg tube group and an integral injection-molded seat. When the stroller is in an unfolded state, the handlebar tube, the front leg tube group and the rear leg tube group are unfolded to form an inverted Y shape, and the center axis of the seat installed on the seat platform is perpendicular to the rotation axis. When the stroller is in a folded state, the seat is first folded and pressed against the front of the handlebar tube, and then the handlebar tube is turned backward around the rotation axis, and the seat is driven to be together in the rear leg tube group, and then the front leg tube group is rotated around the rotation axis and is also together in the rear leg tube group, so that the overall thickness of the stroller after folding can be effectively reduced and the compact and beautiful appearance of the appearance can be ensured, which is convenient for carrying and storage. At the same time, the structural design of the control parts at each joint used to complete the folding is simple and has a structural relationship of first and second linkage, which not only ensures the convenience and effortlessness of the stroller folding operation, but also improves the safety of use.

Description

Technical Field

[0001] The invention relates to a folding stroller for babies to ride on when going out, in particular to an improved folding stroller. Background Art

[0002] At present, baby strollers are designed to be foldable for easy carrying. The folding structure is mainly divided into two types: one-piece folding with a seat and one-piece folding without a seat. The one-piece folding has the advantages of being easy to unfold and use, and easy to fold and store, so it is very popular among consumers. However, in common one-piece folding strollers, in order to facilitate the design of the folding structure, the seat is usually a frame seat, that is, a seat assembled by connecting a number of rods. This kind of seat not only shakes when unfolded and is not stable, but also must be covered with a cloth cover before riding, which is troublesome to use and not very comfortable to ride. However, if an integrated injection-molded seat with better riding comfort is used, the folding method is to drive the seat to flip forward and fold together through the handlebar tube, and the seat is clamped between the handlebar tube and the front leg tube group, and then the rear leg tube group is folded and closed with the front leg tube group; therefore, after the folding structure is completed, the seat, the handlebar tube, the front leg tube group and the rear leg tube group are often in a state of overlapping each other, that is, the overall thickness of the stroller after folding is large, and the volume is obviously not small and beautiful. At the same time, the structural design of the control parts at each joint of these folding strollers is complex, and there is no structural relationship of first and then linkage between the various control parts, so in actual use, it is easy to cause the folding operation of the stroller to become troublesome and laborious, and there are also hidden safety hazards in use. In addition, with the continuous expansion of the market for infant and child products, consumers have also put forward more requirements for the use of folding strollers, and they also more urgently hope that manufacturers can launch more baby strollers that take into account both riding comfort and simplified folding methods, as well as smaller carrying and storage volumes after folding, so as to meet the market's purchasing needs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an improved folding cart which is simple, convenient and labor-saving to fold, has a small size after folding, is easy to carry and store, and is safer to use.

[0004] The technical problem of the present invention is achieved through the following technical solutions:

[0005] An improved folding cart comprises a handlebar tube, a front leg tube group, a rear leg tube group and a seat, wherein the lower end of the handlebar tube, the upper end of the front leg tube group and the upper end of the rear leg tube group are hinged together around the same rotation axis, and the seat is installed on a seat platform at the lower end of the handlebar tube. When the cart is in an unfolded state, the handlebar tube, the front leg tube group and the rear leg tube group are unfolded to form an inverted Y shape, and the center axis of the seat installed on the seat platform is perpendicular to the rotation axis; when the cart is in a folded state, the seat is folded and close to the front part of the handlebar tube, and the handlebar tube flips backward around the rotation axis and drives the seat to be together in the rear leg tube group, and the front leg tube group rotates around the rotation axis to approach the rear leg tube group and is also together in the rear leg tube group.

[0006] A large joint is provided at the lower end of the handlebar tube, a front connecting piece is provided at the upper end of the front leg tube group, and a rear connecting piece is provided at the upper end of the rear leg tube group; a handle with a rotating arm is provided at the front of the large joint; the large joint, the rotating arm, the front connecting piece and the rear connecting piece are arranged side by side in sequence and coaxially hinged to form the same rotation axis, and the rotating arm is fixed to the rear connecting piece; the seat is formed by extending upward from the top of the large joint.

[0007] The handle tube is provided with a pull sleeve of a movable set, a first control component is provided between the large joint and the rotating arm, and a pull rope respectively connecting the pull sleeve and the first control component is provided in the handle tube; the pull sleeve moves up and down along the handle tube, and drives the first control component to lock or unlock the rotation between the large joint and the rotating arm through the pull rope.

[0008] The first control member comprises a rotating cylinder coaxially rotatably installed in the large joint, the end of which is movable through the rotating arm and fixed to the front connecting member, and a rotating disk, a first unlocking member and an outer gear ring which are movably mounted in sequence are arranged outside the rotating cylinder; the rotating disk is radially positioned and rotated around the rotating cylinder; the inner end of the first unlocking member is provided with a support rod which extends axially and contacts the outer end surface of the rotating disk; the inner end of the outer gear ring is tightly attached to the outer end of the first unlocking member, and a first spring which elastically pushes each other is arranged between the outer end of the outer gear ring and the rotating arm, and the outer gear ring is elastically pushed by the first spring and simultaneously meshes with the inner gear ring of the large joint and the rotating arm; the pull rope The lower end is connected to the turntable; the pull sleeve moves upward along the handle tube, drives the turntable to rotate radially through the pull rope, and converts it into driving the first unlocking member to push the outer gear ring to compress the first spring and move axially close to the swing arm, so that the outer gear ring is separated from the inner gear ring of the large joint, and the first control member unlocks the rotation between the large joint and the swing arm; the pull sleeve moves downward along the handle tube, and the first spring releases the compression force to push the outer gear ring and the first unlocking member to move axially and reset, and the turntable also reverses and resets, so that the outer gear ring re-engages the large joint and the inner gear ring of the swing arm, and the first control member locks the rotation between the large joint and the swing arm.

[0009] An outer bevel and an inner bevel are respectively provided between the end of the support rod and the outer end surface of the rotating disk. The rotating disk is radially positioned and rotated to drive the inner bevel to push the outer bevel, which is then converted into an axial movement that drives the first unlocking member to approach the rotating arm.

[0010] A protrusion is provided on the outer surface of the large joint, and a second control member is provided between the rotating arm and the front connecting member; the large joint rotates relative to the rotating arm, and drives the protrusion to touch the second control member to unlock the rotation between the rotating arm and the front connecting member.

[0011] The second control member includes a second unlocking member, a second spring, a locking member, and a pull wire respectively connected to the second unlocking member and the locking member. The locking member is elastically pushed into the front connecting member by the second spring to lock the rotation between the rotating arm and the front connecting member. The large joint rotates relative to the rotating arm and drives the protrusion to touch and push the second unlocking member. The second unlocking member moves outward and drives the locking member to disengage from the front connecting member via the pull wire, thereby unlocking the rotation between the rotating arm and the front connecting member.

[0012] The handle tube comprises an upper tube and a lower tube, the upper end of the upper tube is provided with a push handle, the lower end of the upper tube is provided with an upper connecting piece that is plugged and fixed, the upper end of the lower tube is provided with a lower connecting piece that is plugged and fixed, and the lower end of the lower tube is provided with a large joint that is plugged and fixed; the upper connecting piece and the lower connecting piece are coaxially hinged, and a third control piece is provided between the upper and lower connecting pieces to lock or unlock the rotation between the upper and lower connecting pieces.

[0013] The third control member includes a gear arranged between the upper and lower connecting members, a third spring is provided between the gear and the upper connecting member to elastically push each other, and the gear is elastically pushed by the third spring and simultaneously engages with the inner gear rings of the upper and lower connecting members; a button is provided on the outside of the lower connecting member, and the button extends into the lower connecting member through the support foot and contacts the gear; the button is pressed inward, and the support foot pushes the gear to compress the third spring to axially move away from the inner gear ring of the lower connecting member, and the third control member unlocks the rotation between the upper connecting member and the lower connecting member.

[0014] A fixed pull piece is provided in the pull sleeve, and a safety rod extending upward is provided on the top of the pull piece; the upper end of the pull rope is connected to the pull piece; the third control piece locks the rotation between the upper connecting piece and the lower connecting piece, and the upper end of the safety rod abuts against the gear and limits the upward movement of the pull piece driven by the pull sleeve; the third control piece unlocks the rotation between the upper connecting piece and the lower connecting piece, and the upper connecting piece rotates closely relative to the lower connecting piece and drives the gear to rotate synchronously, and the upper end of the safety rod penetrates into the gear and releases the pull sleeve to drive the pull piece to move upward.

[0015] The seat comprises an integral seat pocket and a backboard, a front armrest hingedly mounted on the front side of the seat pocket, a headrest movably arranged on the top of the backboard, and a shower head rod hingedly mounted on the top of the headrest and located above the seat pocket; the seat pocket is fixedly mounted on the seat platform; when the seat is folded, the front armrest is turned up and the shower head rod is turned down and at the same time closely adheres to the inner side of the backboard, and the headrest moves downward and retracts into the backboard.

[0016] Compared with the prior art, the present invention mainly designs a folding stroller that can effectively ensure a small volume after folding by folding an integral injection-molded seat and a frame. The stroller structure also includes a handlebar tube, a front leg tube group, a rear leg tube group, etc., and the lower end of the handlebar tube, the upper end of the front leg tube group, and the upper end of the rear leg tube group are hinged around the same rotation axis, and the seat is installed on the seat platform at the lower end of the handlebar tube; when in use, when the stroller is in the unfolded state, the handlebar tube, the front leg tube group, and the rear leg tube group unfold to form an inverted Y shape, and the center axis of the seat installed on the seat platform is exactly perpendicular to the rotation axis; when the stroller is in the folded state, the seat first Fold it close to the front part of the handlebar tube, then flip the handlebar tube backward around the rotation axis, and drive the seat to be together in the rear leg tube group, then the front leg tube group rotates around the rotation axis to approach the rear leg tube group and also close in the rear leg tube group; obviously, the seat, handlebar tube and front leg tube group are all close in the rear leg tube group, which can effectively reduce the overall thickness of the stroller after folding and ensure the small and beautiful appearance, which is convenient for carrying and storage; at the same time, the structural design of the control parts at each joint used to complete the folding is simple and has a structural relationship of front and rear linkage, which not only ensures the convenience and effortlessness of the stroller folding operation, but also improves the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional structural schematic diagram of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the appearance structure.

[0019] Figure 3 for Figure 2 Stereoscopic diagram.

[0020] Figure 4 It is a three-dimensional structural exploded view of the first control component, the second control component and the third control component.

[0021] Figure 5 It is a schematic diagram of the structure of the turntable and the first unlocking member.

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure of the first control member.

[0023] Figure 7 It is a schematic cross-sectional structural diagram of the second control member.

[0024] Figure 8 It is a schematic cross-sectional structural diagram of the relative movement between the protrusion and the second unlocking member.

[0025] Fig. 9 This is a schematic diagram of the position structure of the safety rod when the upper and lower tubes are unfolded.

[0026] Fig.10 It is a schematic diagram of the position structure of the safety rod when the upper and lower tubes are folded.

[0027] Fig.11 It is a schematic diagram of the structure of the cart in a fully unfolded state.

[0028] Fig.12 for Fig.11 Schematic diagram of the structure where the seats begin to fold.

[0029] Fig.13 for Fig.12 Schematic diagram of the structure in which the middle and upper tubes are put together on the lower tube.

[0030] Fig.14 for Fig.13 The handlebar tube in the figure is turned backwards to drive the seat to be closed together in the rear leg tube group.

[0031] Fig.15 for Fig.14 The front leg tube group is also closed in the rear leg tube group so that the cart is in a completely folded state. DETAILED DESCRIPTION

[0032] The embodiments of the present invention will be described in detail below with reference to the above-mentioned drawings.

[0033] like Figure 1 to Figure 15As shown, 1. handlebar tube, 11. upper tube, 111. upper connecting piece, 112. push handle, 12. lower tube, 121. lower connecting piece, 2. front foot tube group, 21. front foot tube, 22. front connecting piece, 221. lock hole, 23. front caster, 3. rear foot tube group, 31. rear foot tube, 32. rear connecting piece, 33. rear caster, 4. seat, 41. seat pocket, 42. backboard, 43. front armrest, 44. shower head rod, 45. headrest board, 5. first control part, 51. large joint, 511. seat platform, 512. extension shaft, 513. bump, 52. rotating drum , 53. turntable, 531. inner bevel, 54. first unlocking member, 541. support rod, 542. outer bevel, 55. outer gear ring, 56. first spring, 6. third control member, 61. pull rope, 62. return spring, 63. pull sleeve, 64. button, 641. support foot, 65. gear, 651. small hole, 66. third spring, 67. pull member, 671. safety rod, 7. handle, 71. rotating arm, 72. end shaft, 73. guide groove, 8. second control member, 81. second unlocking member, 82. locking member, 83. pull wire, 84. second spring.

[0034] An improved folding cart, such as Figure 1 to Figure 3 As shown, it relates to a baby product for babies to ride when going out, and its structure is mainly composed of a handlebar tube 1, a front leg tube group 2, a rear leg tube group 3 and a seat 4.

[0035] The handle tube 1 is composed of a single-design upper tube 11 and a lower tube 12. The upper end of the upper tube 11 is provided with a plug-in fixed push handle 112, which can facilitate consumers to support the cart. The lower end of the upper tube 11 is provided with a plug-in fixed upper connecting piece 111, on which a circular upper turntable is provided; the upper end of the lower tube 12 is provided with a plug-in fixed lower connecting piece 121, on which a circular lower turntable is provided, and the lower end of the lower tube 12 is provided with a plug-in fixed large joint 5 1, the large joint is a horizontally placed hollow cylindrical tube, and the lower end of the lower tube 12 is mainly fixedly connected with the extension shaft 512 on the outer circumferential surface of the large joint 51, and a seat 511 extending vertically upward in a circular tube shape is also provided on the outer circumferential surface of the large joint 51, and the axis of the seat is perpendicular to the axis of the large joint 51, and the axis of the seat 511 and the axis of the extension shaft 512 are intersected at the axis of the large joint 51, and a certain angle is formed between the two.

[0036] The upper connecting member 111 and the lower connecting member 121 are coaxially hinged through upper and lower rotating disks, both of which are provided with inner gear rings, and a third control member 6 for locking or unlocking the rotation between the upper and lower connecting members is provided between the upper and lower rotating disks.

[0037] The third control member 6 includes a gear 65 disposed between the upper and lower rotating disks, a third spring 66 is disposed between the gear and the upper rotating disk to push each other elastically, and the gear 65 is pushed elastically by the third spring 66 and simultaneously engages with the inner gear rings of the upper rotating disk and the lower rotating disk, at which time the rotation between the upper and lower connecting members is locked; the lower rotating disk is provided with a button 64 on the outside, and the button extends into the lower rotating disk through the support leg 641 and contacts the gear 65; therefore, once the button 64 is pressed inward, the support leg 641 can push the gear 65 to compress the third spring 66 to move axially and disengage from the inner gear ring of the lower rotating disk, at which time the rotation between the upper and lower connecting members is unlocked. Conversely, once the pressing force on the button 64 is released, the compression force of the third spring 66 is released and the pushing gear 65 is reset, and the rotation between the upper and lower connecting members is locked again.

[0038] The seat 4 includes an integrally injection-molded seat pocket 41 and a backboard 42, a front armrest 43 hingedly mounted on the front side of the seat pocket 41, a headrest 45 movably mounted on the top of the backboard 42, and a shower head rod 44 hingedly mounted on the top of the headrest 45 and located above the seat pocket 41; the seat 4 is fixedly mounted on the seat platform 511 of the large joint 51 at the lower end of the handlebar tube 1 through the seat pocket 41, and is usually rotatably mounted around the axis of the seat platform 511, so that the seat 4 can be rotated forward or backward in actual use. When the seat 4 is folded, it must be ensured to be in the forward rotation state, and then the front armrest 43 is flipped up and the shower head rod 44 is flipped down while being close to the inner side of the backboard 42, and then the headrest 45 is moved downward and retracted into the backboard 42, at which time the volume of the entire seat 4 will be reduced, and it looks like it is close to the front of the handlebar tube 1.

[0039] The front leg tube group 2 is composed of two front leg tubes 21 arranged symmetrically and parallel to the left and right, each front leg tube has a front connector 22 at the upper end thereof, and a front caster 23 at the lower end thereof; the rear leg tube group 3 is composed of two rear leg tubes 31 arranged symmetrically and parallel to the left and right, each rear leg tube has a rear connector 32 at the upper end thereof, and a rear caster 33 at the lower end thereof; the lower end of the handlebar tube 1, the upper end of the front leg tube group 2, and the upper end of the rear leg tube group 3 They are hinged around the same rotation axis, and the specific structure is: a handle 7 is first provided at the front of the large joint 51, and rotating arms 71 extend from both ends of the handle, and the two rotating arms are respectively located at both ends of the large joint 51, and the front connecting parts 22 at the upper ends of the two front leg tubes 21 are respectively located at both ends of the rotating arms 71, and the rear connecting parts 32 at the upper ends of the two rear leg tubes 31 are respectively located at both ends of the front connecting parts 22, that is, the large joint 51, the rotating arm 71, the front connecting part 22 and the rear connecting part 32 are arranged side by side in sequence and coaxially hinged to form the same rotation axis.

[0040] The large joint 51 and the rotating arm 71 are both provided with an internal gear ring, and the two ends of the rotating arm 71 are respectively provided with end shafts 72 extending to both sides. The end shaft 72 at each end is movable through the front connecting piece 22 on the same side and then fixed to the rear connecting piece 32 on the same side; in this way, when the handle 7 is rotated, the two rear connecting pieces 32 at both ends, the two rear leg tubes 31 and the two rear casters 33 can be driven to rotate synchronously, that is, the handle 7 can drive the rear leg tube group 3 to rotate synchronously.

[0041] At the same time, a pull sleeve 63 with a movable sleeve is provided on the handlebar tube 1, specifically, it is slidably mounted on the lower tube 12 and adjacent to the third control member 6, a first control member 5 is provided between the large joint 51 and the rotating arm 71, and a pull rope 61 is provided in the handlebar tube 1, which connects the pull sleeve 63 and the first control member 5 respectively; the pull sleeve 63 moves up and down along the handlebar tube 1, and drives the first control member 5 to lock or unlock the rotation between the large joint 51 and the rotating arm 71 through the pull rope 61.

[0042] Among them, a fixed pull piece 67 is provided in the pull sleeve 63, and the upper end of the pull rope 61 is actually connected to the pull piece 67. Therefore, when the pull sleeve 63 moves up and down along the lower tube 12, it will drive the internal pull piece 67 to move synchronously, and then pull the pull rope 61 upward or release the pull rope 61 downward, so as to drive the first control member 5 to achieve locking or unlocking; the top of the pull piece 67 is provided with a safety rod 671 extending upward. When the third control member 6 locks the rotation between the upper connecting member 111 and the lower connecting member 121, the upper end of the safety rod 671 will Fig. 9 As shown, it abuts against the gear 65 and limits the upward movement of the pull sleeve 63 driving the pull member 67; when the third control member 6 unlocks the rotation between the upper connecting member 111 and the lower connecting member 121, so that the upper connecting member 111 rotates closely relative to the lower connecting member 121, the upper connecting member 111 also drives the synchronous rotation of the gear 65, and at this time the upper end of the safety rod 671 can be as Fig.10 As shown, the pull piece 67 is inserted into the preset small hole 651 on the gear 65, which releases the pull sleeve 63 to drive the pull piece 67 to move upward.

[0043] The purpose of designing the safety rod 671 is to ensure that the unlocking or locking action of the third control member 6 can be linked with the lifting action of the pull sleeve 63 along the handlebar tube 1, that is, the third control member 6 and the first control member 5 are linked in a first and a second manner, and only when the third control member 6 is unlocked and a fold is formed between the upper and lower tubes, can the pull sleeve 63 be allowed to slide and unlock the first control member 5. Obviously, such a design structure can greatly ensure the safety of the cart folding operation.

[0044] The first control member 5 is as follows Figure 6As shown, it includes a rotating cylinder 52 coaxially rotatably installed in the large joint 51, each end of the rotating cylinder moves through the rotating arm 71 on the same side and is then fixed to the front connecting piece 22 on the same side; in this way, the connection of the rotating cylinder 52 can ensure that the two front leg tubes 21 can form synchronous rotation.

[0045] Meanwhile, the first control member 5 further comprises a rotating disk 53 , a first unlocking member 54 and an outer gear ring 55 which are movably mounted on the outside of the rotating drum 52 in sequence.

[0046] The rotating disk 53 is positioned and rotated radially around the rotating drum 52, that is, the rotating disk 53 cannot move axially outside the rotating drum 52 but can only rotate radially; the inner end of the first unlocking member 54 is provided with three support rods 541 that are evenly distributed around the circumference and parallel to each other, each support rod 541 extends axially from the inner end of the first unlocking member 54 and contacts the outer end surface of the rotating disk 53, and between the end of the support rod 541 and the outer end surface of the rotating disk 53, there are also provided Figure 5 The outer bevel 542 and the inner bevel 531 are shown to fit together; the inner end of the outer gear ring 55 is in close contact with the outer end of the first unlocking piece 54, and a first spring 56 is provided between the outer end of the outer gear ring 55 and the rotating arm 71 for elastically pushing each other, and under normal conditions, the elastic pushing of the first spring 56 causes the outer gear ring 55 to simultaneously engage with the inner gear rings of the large joint 51 and the rotating arm 71, and at this time, the rotation between the large joint 51 and the rotating arm 71 is locked.

[0047] The lower end of the pull rope 61 is connected to the turntable 53, and a reset spring 62 is installed outside the pull rope 61. When the pull rope 61 is pulled upward, the reset spring 62 can be compressed to drive the turntable 53 to rotate around the drum 52. Once the tension on the pull rope 61 is released, the reset spring 62 releases the compression force and can drive the pull rope 61 and the turntable 53 to reset.

[0048] Therefore, the action process between the pull sleeve 63 and the first control member 5 is as follows: when the pull sleeve 63 is driven to move upward along the handle tube 1, the pull rope 61 can drive the rotary disk 53 to rotate radially, and the radial positioning rotation of the rotary disk drives the inner inclined surface 531 to push the outer inclined surface 542, which is then converted into driving the first unlocking member 54 to push the outer gear ring 55 to compress the first spring 56 and move axially close to the rotating arm 71, so that the outer gear ring 55 is separated from the inner gear ring of the large joint 51, thereby unlocking the large joint 51 and the rotating arm 71. When the upward movement driving force on the pull sleeve 63 is released, the reset spring 62 will drive the pull sleeve 63 to move downward and reset along the handle tube 1, and the pull rope 61 and the turntable 53 will be reset synchronously. At this time, the first spring 56 releases the compression force and also pushes the outer gear ring 55 and the first unlocking member 54 to move axially and reset. The inner and outer inclined surfaces fit together again, so that the outer gear ring 55 re-engages the inner gear ring of the large joint 51 and the rotating arm 71, thereby re-locking the rotation between the large joint 51 and the rotating arm 71.

[0049] In addition, a protrusion 513 is provided on the outer surface of the large joint 51, and a second control member 8 is provided between the rotating arm 71 and the front connecting member 22. When the large joint 51 rotates relative to the rotating arm 71, the protrusion 513 can be driven to rotate. Figure 8 As shown, the second control member 8 is touched to unlock the rotation between the rotating arm 71 and the front connecting member 22 .

[0050] Among them, the second control element 8 is as follows Figure 7 As shown, it mainly includes a second unlocking member 81, a second spring 84, a locking member 82 installed in the handle 7, and a pull wire 83 respectively connecting the second unlocking member 81 and the locking member 82; the locking member 82 is elastically pushed into the lock hole 221 of the front connecting member 22 by the second spring 84, that is, the locking member 82 is just stuck between the rotating arm 71 and the front connecting member 22, thereby locking the rotation between the rotating arm 71 and the front connecting member 22; when the large joint 51 rotates relative to the rotating arm 71, it can drive the protrusion 513 to move in a circle and touch the second unlocking member 81, and push the second unlocking member to move outward along the guide groove 73 in the handle 7, and the movement of the second unlocking member 81 can be directly converted to the movement of the locking member 82 driven by the pull wire 83, and the locking member can directly move away from the front connecting member 22, thereby unlocking the rotation between the rotating arm 71 and the front connecting member 22.

[0051] From the above, it can be seen that the unlocking action of the first control member 5 and the unlocking action of the second control member 8 are also linked in sequence. Only when the first control member 5 is unlocked and the large joint 51 is rotated and folded relative to the rotating arm 71, can the protrusion 513 rotate in a circle and touch the second unlocking member 81 to move, that is, the second control member 8 is unlocked. Obviously, such a design structure can also greatly ensure the safety of the cart folding operation.

[0052] The cart of the present invention is in the following Fig.11 In the unfolded state shown in the figure, the handlebar tube 1, the front leg tube group 2 and the rear leg tube group 3 are all unfolded and locked and in an inverted Y shape, and the center axis of the seat 4 installed on the seat platform 511 is exactly perpendicular to the rotation axis of the large joint 51, so as to ensure the aesthetic appearance of the stroller and the comfort of the seat 4; when the stroller is in the folded state, as shown in the figure, Figure 12 to Figure 15 As shown, the seat 4 is first folded close to the front of the handlebar tube 1, and the third control member 6 is unlocked so that the upper tube 11 of the handlebar tube 1 is turned downward and close to the lower tube 12. After the upper and lower tubes are folded together, the lifting and lowering activity of the pull sleeve 63 is also released, thereby unlocking the first control member 5 so that the handlebar tube 1 is turned backward around the rotation axis, and drives the seat 4 to be together and together in the rear leg tube group 3. At the same time, the second control member 8 is unlocked again, so that the front leg tube group 2 can rotate around the rotation axis and approach the rear leg tube group 3, and also be together in the rear leg tube group 3, and finally the folding of the entire cart is completed.

[0053] Obviously, placing the seat 4, the handle tube 1 and the front leg tube group 2 together in the rear leg tube group 3 can effectively reduce the overall thickness of the stroller after folding and ensure the compact and beautiful appearance, which is convenient for carrying and storage; at the same time, the first control member 5, the second control member 8 and the third control member 6 used to complete the folding are simply designed and have a front-rear linkage structural relationship, which not only ensures the convenience and effortlessness of the stroller folding operation, but also improves the safety of use.

[0054] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design similar to this embodiment should be included in the protection scope of the present invention.

Claims

1. An improved folding stroller, comprising a handlebar tube (1), a front leg tube group (2), a rear leg tube group (3) and a seat (4), wherein the lower end of the handlebar tube (1), the upper end of the front leg tube group (2) and the upper end of the rear leg tube group (3) are hinged together around the same rotation axis, and the seat (4) is mounted on a seat (511) at the lower end of the handlebar tube (1), characterized in that The cart is in an unfolded state, the handle tube (1), the front leg tube group (2) and the rear leg tube group (3) are unfolded to form an inverted Y shape, and the center axis of the seat (4) mounted on the seat platform (511) is perpendicular to the rotation axis; the cart is in a folded state, the seat (4) is folded close to the front of the handle tube (1), and the handle tube flips backward around the rotation axis, and drives the seat (4) to be together in the rear leg tube group (3), and the front leg tube group (2) rotates around the rotation axis to approach the rear leg tube group (3) and is also together in the rear leg tube group (3); the lower end of the handle tube (1) is provided with a large joint (51), the upper end of the front leg tube group (2) is provided with a front connecting piece (22), and the upper end of the rear leg tube group (3) is provided with a rear connecting piece (32); The front part of the large joint (51) is provided with a handle (7) with a rotating arm (71); the large joint (51), the rotating arm (71), the front connecting piece (22) and the rear connecting piece (32) are arranged side by side in sequence and are coaxially hinged to form the same rotation axis, and the rotating arm (71) and the rear connecting piece (32) are fixed; the seat (511) is formed by the top of the large joint (51) extending upward; a pull sleeve (63) with a movable sleeve is provided on the handle tube (1), a first control piece (5) is provided between the large joint (51) and the rotating arm (71), and a pull rope (61) respectively connecting the pull sleeve (63) and the first control piece (5) is provided in the handle tube (1); the pull sleeve (63) moves up and down along the handle tube (1), and The pull rope (61) drives the first control member (5) to lock or unlock the rotation between the large joint (51) and the rotating arm (71); the first control member (5) comprises a rotating drum (52) coaxially rotatably mounted in the large joint (51); the end of the rotating drum movably passes through the rotating arm (71) and is fixed to the front connecting member (22); a rotating disk (53), a first unlocking member (54) and an outer gear ring (55) are arranged outside the rotating drum (52) and are movably mounted in sequence; the rotating disk (53) rotates around the rotating drum (52) in a radially positioned manner; the inner end of the first unlocking member (54) is provided with a support rod (541) extending axially and contacting the outer end surface of the rotating disk (53); the inner end of the outer gear ring (55) is tightly attached to the outer end of the first unlocking member (54); the outer gear ring (5 ... outer gear ring (55) is provided with a support rod (541) extending axially and contacting the outer end surface of the rotating disk (53); the outer gear ring (55) is provided with a support rod (541) extending axially and contacting the outer end surface of the rotating disk (53); the outer gear ring (55) is provided with a support rod (541) extending axially and contact A first spring (56) is provided between the outer end of the ring (55) and the rotating arm (71) for elastically pushing each other, and the outer gear ring (55) is elastically pushed by the first spring (56) to simultaneously engage with the inner gear rings of the large joint (51) and the rotating arm (71); the lower end of the pull rope (61) is connected to the rotating disk (53); the pull sleeve (63) moves upward along the handlebar tube (1), drives the rotating disk (53) to rotate radially through the pull rope (61), and converts it into driving the first unlocking member (54) to push the outer gear ring (55) to compress the first spring (56) and move axially close to the rotating arm (71), so that the outer gear ring (55) is separated from the inner gear ring of the large joint (51), and the first control member (5) unlocks the rotation between the large joint (51) and the rotating arm (71);The pull sleeve (63) moves downward along the handlebar tube (1), the first spring (56) releases the compression force to push the outer gear ring (55) and the first unlocking member (54) to move axially and reset, and the rotating disk (53) also reverses and resets, so that the outer gear ring (55) re-engages the inner gear ring of the large joint (51) and the rotating arm (71), and the first control member (5) locks the rotation between the large joint (51) and the rotating arm (71); the handlebar tube (1) includes an upper tube (11) and a lower tube (1 2) The upper end of the upper tube (11) is provided with a push handle (112), the lower end of the upper tube (11) is provided with an upper connecting piece (111) that is plugged and fixed, the upper end of the lower tube (12) is provided with a lower connecting piece (121) that is plugged and fixed, and the lower end of the lower tube (12) is provided with a large joint (51) that is plugged and fixed; the upper connecting piece (111) and the lower connecting piece (121) are coaxially hinged, and a third control piece (6) is provided between the upper and lower connecting pieces to lock or unlock the rotation between the upper and lower connecting pieces. ; 2. An improved folding cart according to claim 1, characterized in that An outer bevel (542) and an inner bevel (531) are respectively provided between the end of the support rod (541) and the outer end surface of the rotating disk (53). The rotating disk (53) is radially positioned and rotated to drive the inner bevel (531) to push the outer bevel (542), thereby converting into an axial movement that drives the first unlocking member (54) to approach the rotating arm (71).

3. An improved folding cart according to claim 1, characterized in that A protrusion (513) is provided on the outer surface of the large joint (51), and a second control member (8) is provided between the rotating arm (71) and the front connecting member (22); the large joint (51) rotates relative to the rotating arm (71), and drives the protrusion (513) to contact the second control member (8) to unlock the rotation between the rotating arm (71) and the front connecting member (22).

4. An improved folding cart according to claim 3, characterized in that The second control member (8) comprises a second unlocking member (81), a second spring (84), a locking member (82) installed in the handle (7), and a pull wire (83) respectively connecting the second unlocking member (81) and the locking member (82); the locking member (82) is pushed into the front connecting member (22) by the elasticity of the second spring (84) to lock the rotation between the rotating arm (71) and the front connecting member (22); the large joint (51) rotates the rotating arm (71) and drives the protrusion (513) to touch and push the second unlocking member (81), and the second unlocking member moves outward to drive the locking member (82) to disengage from the front connecting member (22) via the pull wire (83), thereby unlocking the rotation between the rotating arm (71) and the front connecting member (22).

5. An improved folding cart according to claim 1, characterized in that The third control member (6) comprises a gear (65) arranged between the upper and lower connecting members, a third spring (66) is arranged between the gear and the upper connecting member (111) to elastically push each other, and the gear (65) is elastically pushed by the third spring (66) to simultaneously engage with the inner gear rings of the upper connecting member (111) and the lower connecting member (121); a button (64) is arranged on the outside of the lower connecting member (121), and the button extends into the lower connecting member (121) through a support leg (641) to contact the gear (65); the button (64) is pressed inwardly and pushes the gear (65) through the support leg (641) to compress the third spring (66) to axially move away from the inner gear ring of the lower connecting member (121), and the third control member (6) unlocks the rotation between the upper connecting member (111) and the lower connecting member (121).

6. An improved folding cart according to claim 5, characterized in that A fixedly mounted pull piece (67) is provided in the pull sleeve (63), and a safety rod (671) extending upward is provided on the top of the pull piece; the upper end of the pull rope (61) is connected to the pull piece (67); the third control member (6) locks the rotation between the upper connecting member (111) and the lower connecting member (121), the upper end of the safety rod (671) abuts against the gear (65), and limits the upward movement of the pull piece (67) driven by the pull sleeve (63); the third control member (6) unlocks the rotation between the upper connecting member (111) and the lower connecting member (121), the upper connecting member (111) rotates closely relative to the lower connecting member (121), and drives the gear (65) to rotate synchronously, the upper end of the safety rod (671) penetrates into the gear (65), and releases the pull sleeve (63) to drive the pull piece (67) to move upward.

7. An improved folding cart according to claim 1, characterized in that The seat (4) comprises an integrally formed seat pocket (41) and a back panel (42), a front armrest (43) hingedly mounted on the front side of the seat pocket (41), a headrest (45) movably arranged on the top of the back panel (42), and a shower head rod (44) hingedly mounted on the top of the headrest (45) and located above the seat pocket (41); the seat pocket (41) is fixedly mounted on the seat platform (511); when the seat (4) is folded, the front armrest (43) is flipped up and the shower head rod (44) is flipped down while being closely attached to the inner side of the back panel (42), and the headrest (45) is moved downward and retracted into the back panel (42).

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