CN110667683A

CN110667683A - Seat frame assembly, stroller and folding method thereof

Info

Publication number: CN110667683A
Application number: CN201910894345.9A
Authority: CN
Inventors: 胡杰
Original assignee: Dongguan Jinwang Children Article Co Ltd
Current assignee: Mamas and Papas Holdings Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-01-10
Also published as: CN114435451A

Abstract

The invention discloses a seat frame assembly for a baby stroller, which comprises a first back part, a second back part, a seat part, a switch unit, an upper rotating joint and a lower rotating joint, wherein the upper rotating joint is connected between the first back part and the second back part, the lower rotating joint is connected between the second back part and the seat part, the switch unit is arranged on a cross beam between the first back part and the second back part, the cross beam is connected with the upper rotating joint, and the switch unit can unlock the upper rotating joint and the lower rotating joint. The invention also discloses a baby stroller, a folding method of the seat frame assembly and a folding method of the baby stroller frame. After the upper rotating joint and the lower rotating joint are unlocked, the first back part and the second back part rotate relative to the seat part to be folded, so that the independent folding operation of the seat frame assembly is realized, the stroller frame can be independently folded or unfolded relative to the stroller frame, the adjustment is convenient, and the stroller frame is suitable for different use states and requirements.

Description

Seat frame assembly, stroller and folding method thereof

Technical Field

The invention relates to the technical field of baby strollers, in particular to a seat frame assembly, a baby stroller, a folding method of the seat frame assembly and a folding method of the baby stroller.

Background

As shown in fig. 1, the conventional stroller frame generally includes a push rod 1 ', a front frame 2 ', a rear frame 3 ', a grab bar 4 ', a seat frame 5 ', wheels 6 ' and a rotary joint 7 ', the push rod 1 ' is connected to the front frame 2 ' via the rotary joint 7 ', the grab bar 4 ' is fixedly connected to the front frame 2 ', the rear frame 3 ' is movably connected to the front frame 2 ', and the seat frame 5 ' is movably connected to the front frame 2 ' and the rear frame 3 '. When the bicycle is folded, the rotary joint 7 ' is unlocked, the push rod 1 ' is forwards overturned and folded relative to the front bracket 2 ', the rear bracket 3 ' is folded towards the direction close to the front bracket 2 ', and the rear end of the seat frame 5 ' rotates downwards and is folded towards the direction close to the front bracket 2 '.

The existing baby stroller frame is not provided with a seat frame component which can be independently folded. When the baby stroller is folded, the seat frame is folded together, the seat frame can not be adjusted independently, and the flexibility is poor.

Accordingly, there is a need for a seat frame assembly for a stroller, a method of folding the seat frame assembly, and a method of folding a stroller that are capable of being independently folded, collapsed, and adjusted.

Disclosure of Invention

The present invention is directed to overcoming the disadvantages of the prior art, and provides a seat frame assembly for a stroller, a method for folding the seat frame assembly, and a method for folding the stroller, which are capable of being independently folded, collapsed, and adjusted.

The invention provides a seat frame assembly for a baby stroller, which comprises a first back part, a second back part, a seat part, a switch unit, an upper rotating joint connected between the first back part and the second back part, and a lower rotating joint connected between the second back part and the seat part, wherein the switch unit is arranged on a cross beam between the first back part and the second back part, the cross beam is connected with the upper rotating joint, and the switch unit can unlock the upper rotating joint and the lower rotating joint.

Further, the air conditioner is provided with a fan,

when the folding seat is folded, after the switch unit is operated, the switch unit drives the upper rotating joint and the lower rotating joint to be unlocked, so that the first back part can be folded in a rotating mode relative to the second back part, and the second back part can be folded in a rotating mode relative to the seat part;

when the seat is unfolded, the first back part is rotated, the upper rotating joint locks the first back part after the first back part is rotated and unfolded in place relative to the second back part, and the lower rotating joint locks the second back part after the second back part is rotated and unfolded in place relative to the seat part.

Furthermore, the first back part comprises a hollow U-shaped rod, and two ends of the U-shaped rod are connected with the two upper rotating joints.

Furthermore, the switch unit comprises a turnover part, a return spring and a steel wire, the turnover part is rotatably connected with the cross beam, the return spring is installed between the turnover part and the cross beam, one end of the steel wire is connected with the turnover part, and the other end of the steel wire is connected with the upper rotating joint and the lower rotating joint;

when the turnover piece rotates, the turnover piece pulls the steel wire, and the steel wire drives the upper rotating joint and the lower rotating joint to be unlocked.

Further, the steel wire includes first steel wire and second steel wire, first steel wire with go up the rotation joint and connect, the second steel wire with down the rotation joint is connected.

Further, the lower rotary joint comprises a first shell, a second shell, a rotary shaft, a locking pin and a locking groove;

the first housing is connected to the second back portion, the second housing is connected to the seat portion, the rotating shaft is connected to the first housing and the second housing, the first housing is rotatable about the rotating shaft, the locking pin is connected to the switch unit and mounted between the first housing and the second housing, and the locking groove is formed on the second housing;

when locking, the locking pin enters the locking groove;

when the lock is unlocked, the switch unit drives the locking pin to be disengaged from the locking groove.

Further, the lower rotating joint further comprises a sliding groove shell, a sliding part and a clamping jaw plate, the sliding groove shell is connected between the second back and the second shell, the sliding groove shell is connected with the switch unit, one end of the locking pin is fixed on the sliding part, the other end of the locking pin penetrates through the limiting groove of the sliding groove shell and can be followed by the sliding groove shell to slide, the clamping jaw plate is installed on the second shell, a plurality of clamping grooves in the clamping jaw plate correspond to the locking groove, and the other end of the locking pin penetrates through the sliding groove shell and then is inserted into the clamping groove and the locking groove.

Further, the upper rotating joint comprises a first rotating piece, a second rotating piece and a cam, the first rotating piece is connected with the first back part, the second rotating piece is connected with the second back part, and the first rotating piece is rotatably connected with the second rotating piece;

when the upper rotating joint is locked, the cam is positioned between the first rotating piece and the second rotating piece along the axis direction;

the switch unit can drive the cam to be separated from the first rotating piece or the second rotating piece along the axis direction, and the upper rotating joint is unlocked.

Further, the seat frame assembly further comprises a ceiling unit, wherein the ceiling unit comprises a ceiling rod and a ceiling rod rotating piece, and the ceiling rod rotating piece is rotatably connected with the first rotating piece and is fixedly connected with the ceiling rod.

The invention also provides a baby stroller, which comprises a baby stroller frame, the baby stroller frame comprises a push rod, a front support, a rear support, wheels and a grab bar, and the baby stroller frame further comprises the seat frame assembly, and the seat frame assembly is arranged on the baby stroller frame.

Furthermore, the fore-stock with seat portion rotatable coupling, down the revolute joint with through head rod rotatable coupling between the push rod, the bar with seat portion rotatable coupling, the bar extends the second connecting rod, the second connecting rod through the third connecting rod with head rod rotatable coupling.

The invention also provides a method of folding a seat frame assembly for use in a seat frame assembly as defined in any one of the preceding claims, comprising the steps of:

operating the switch unit to unlock the upper rotary joint and the lower rotary joint;

turning the first back part forwards and downwards to enable the first back part to approach the second back part;

and turning the second back part forwards and downwards to enable the second back part to approach the seat part.

The present invention also provides a stroller folding method for the stroller, comprising the steps of:

turning the second back part forwards and downwards to enable the second back part to approach the seat part;

and folding the baby stroller frame.

Further, the step of folding the stroller frame further comprises:

the push rod is turned forwards and downwards, and approaches to the front support;

the front support and the rear support are close to each other.

After adopting above-mentioned technical scheme, have following beneficial effect:

after the upper rotating joint and the lower rotating joint are unlocked, the first back part and the second back part rotate relative to the seat part to be folded, so that the independent folding operation of the seat frame assembly is realized, the stroller frame can be independently folded or unfolded relative to the stroller frame, the adjustment is convenient, and the stroller frame is suitable for different use states and requirements.

Drawings

The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:

FIG. 1 is a perspective view of a prior art stroller frame;

FIG. 2 is a perspective view of a seat frame assembly in accordance with one embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of the seat frame assembly at the switch unit in accordance with one embodiment of the present invention;

FIG. 4 is a perspective view of a tumbler of a switch unit of the seat frame assembly in a first embodiment of the invention;

FIG. 5 is a perspective view of the seat frame assembly with the tumblers omitted from the switch unit in accordance with a first embodiment of the present invention;

FIG. 6 is an enlarged partial view of the seat frame assembly at the lower revolute joint according to one embodiment of the present invention;

FIG. 7 is an exploded view of the seat frame assembly at the lower revolute joint according to one embodiment of the present invention;

FIG. 8 is a schematic view of the structure at the lower revolute joint of the seat frame assembly according to a variation of the first embodiment of the present invention;

FIG. 9 is an exploded view of a side of the seat frame assembly at the lower revolute joint in a variation of the first embodiment of the present invention;

FIG. 10 is an exploded view of the other side of the seat frame assembly at the lower revolute joint in a variation of the first embodiment of the present invention;

FIG. 11 is an enlarged partial view of the seat portion of the seat frame assembly in a modification of the first embodiment of the present invention;

FIG. 12 is an exploded view of one side of the upper pivot joint of the seat frame assembly in accordance with one embodiment of the present invention;

FIG. 13 is an exploded view of the other side of the upper pivot joint of the seat frame assembly in accordance with one embodiment of the present invention;

FIG. 14 is a perspective view of a stroller in accordance with a second embodiment of the present invention;

FIG. 15 is an enlarged, fragmentary view of a stroller in accordance with a second embodiment of the present invention;

FIG. 16 is a flow chart of a method of folding a seat frame assembly according to a third embodiment of the present invention;

fig. 17 is a flow chart illustrating a method for folding the stroller in accordance with a fourth embodiment of the present invention.

Reference symbol comparison table:

the push rod 1 ', the front bracket 2 ', the rear bracket 3 ', the grab bar 4 ', the seat frame 5 ', the wheel 6 ' and the rotary joint 7 ';

the seat frame assembly 10:

first back 11: a second through hole 111;

seat portion 12: the seat plate 121, the extension rod 122, the first connecting column 123, the shielding plate 124, the mounting groove 125, the embedded groove 1211 and the handle hole 1212;

lower revolute joint 13: the locking mechanism comprises a first shell 131, a second shell 132, a rotating shaft 133, a locking pin 134, a locking groove 135, a sliding groove shell 136, a sliding piece 137, a jaw plate 138, a cross bar 139, a guide groove 1321, a second connecting column 1322, a limiting groove 1361, a third steel wire hole 1362, a second steel wire hole 1371, a pin hole 1372, a limiting block 1373 and a clamping groove 1381;

the switching unit 14: the turnover piece 141, the return spring 142, the steel wire 143, the first steel wire hole 1411, the first hinge 1412, the first steel wire 143a, and the second steel wire 143 b;

the cross beam 16: a second hinge 161;

ceiling unit 17: a ceiling lever 171, a ceiling rotor 172, and a ceiling cloth 173;

a second back 18;

upper revolute joint 19: the first rotating member 191, the second rotating member 192, the cam 193, the cam slot 1921, the sliding shaft 1922, and the fourth wire hole 1931;

the baby stroller frame 20: the device comprises a push rod 21, a front support 22, a rear support 23, wheels 24, a first connecting rod 25, a frame rotating joint 26, a grab bar 27, a second connecting rod 28 and a third connecting rod 29.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings.

It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

The "front", "rear", "up", "down", "left" and "right" directions in the present invention are based on the orientation of the stroller.

The first embodiment is as follows:

fig. 2-14 are schematic structural views of a seat frame assembly according to an embodiment of the invention.

A seat frame assembly for a stroller includes a first back portion 11, a second back portion 18, a seat portion 12, a switch unit 14, an upper rotary joint 19 connected between the first back portion 11 and the second back portion 18, and a lower rotary joint 13 connected between the second back portion 18 and the seat portion 12, the switch unit 14 is mounted on a cross member 16 between the first back portion 11 and the second back portion 18, the cross member 16 is connected to the upper rotary joint 19, and the switch unit 14 is capable of unlocking the upper rotary joint 19 and the lower rotary joint 13.

During folding, after the switch unit 14 is operated, the switch unit 14 drives the upper rotating joint 19 and the lower rotating joint 13 to unlock, so that the first back part 11 can be folded in a rotating way relative to the second back part 18, and the second back part 18 can be folded in a rotating way relative to the seat part 12;

when the seat portion 12 is unfolded, the upper rotary joint 19 locks the first back portion 11 after the first back portion 11 is rotated and unfolded in position relative to the second back portion 18, and the lower rotary joint 13 locks the second back portion 18 after the second back portion 18 is rotated and unfolded in position relative to the seat portion 12.

When folding is needed, the switch unit 14 is operated, and the switch unit 14 drives the upper rotating joint 19 and the lower rotating joint 13 to unlock;

then, the first back 11 is rotated toward the direction approaching the second back 18 until the first back 11 is rotated to a position almost parallel to the second back 18;

the first back 11 and the second back 18 are then rotated together toward the seat 12 until the first back 11 and the second back 18 are rotated to a substantially horizontal position relative to the seat 12.

When the seat frame assembly 10 needs to be unfolded again, the first back part 11 and the second back part 18 are rotated towards the direction away from the seat part 12 until the proper unfolding angle is adjusted, and the lower rotating joint 13 is locked again; the first back 11 is then turned upwards with respect to the second back 18 until the first back 11 and the second back 18 are aligned and the upper revolute joint 19 is locked again.

In this embodiment, after the upper rotating joint 19 and the lower rotating joint 13 are unlocked, the first back 11 and the second back 18 rotate to be folded relative to the seat 12, so as to realize the operation of independently folding and folding the seat frame assembly, and can be independently folded or unfolded relative to the stroller frame, which is convenient to adjust and suitable for different use states and requirements.

As shown in fig. 2, the first back 11 includes a hollow U-shaped rod, and two ends of the U-shaped rod are connected to two upper revolute joints 19.

Specifically, the first back 11 is a complete U-shaped bar, and the U-shaped bar is installed upside down when unfolded, and two ends of the U-shaped bar are respectively connected with the upper rotating joint 19.

When the baby stroller is in actual use, the U-shaped rod is sleeved with a backrest cloth or a backrest plate for supporting the back of a baby.

Optionally, the first back 11 may also have other structures, such as: the U-shaped bar is replaced by a back rest that is capable of supporting the head of the infant.

Further, as shown in fig. 2, the second back 18 is two straight rods, which are respectively connected to two ends of the U-shaped first back 11. The first back portion 11 and the second back portion 18 are connected by an upper rotating joint 19, the two upper rotating joints 19 are connected by a cross beam 16, and the switch unit 14 is mounted on the cross beam 16.

Further, as shown in fig. 3 to 5, the switch unit 14 includes a flip 141, a return spring 142 and a steel wire 143, the flip 141 is rotatably connected to the cross beam 16, the return spring 142 is installed between the flip 141 and the cross beam 16, one end of the steel wire 143 is connected to the flip 141, and the other end is connected to the upper rotary joint 19 and the lower rotary joint 13;

when the turning piece 141 is rotated, the turning piece 141 pulls the steel wire 143, and the steel wire 143 drives the upper turning joint 19 and the lower turning joint 13 to be unlocked.

Specifically, as shown in fig. 4-5, the turning member 141 includes a first wire hole 1411 and a first hinge portion 1412, the first wire hole 1411 is fixedly connected to one end of the wire 143, and the first hinge portion 1412 is rotatably connected to the second hinge portion 161 of the cross member 16. One end of the return spring 142 is connected to the turning piece 141, and the other end is connected to the cross member 16.

When the tumblers 141 are tumbled toward the rear of the seat frame assembly 10, the tumblers 141 rotate about the first hinge portion 1412 and pull the wire 143, the wire 143 unlocks the upper and lower

revolute joints

19 and 13, and the tumblers 141 are tumbled, stretching the return spring 142. When the flip member 141 is released, the return spring 142 brings the flip member 141 to return to the original position.

Further, as shown in fig. 5, the steel wire 143 includes a first steel wire 143a and a second steel wire 143b, the first steel wire 143a is connected to the upper rotary joint 19, and the second steel wire 143b is connected to the lower rotary joint 13.

The first wire holes 1411 of the turnover member 141 are two and are connected to one total wire 143, and one total wire 143 is divided into two, that is, a first wire 143a and a second wire 143b, the first wire 143a is connected to the upper rotary joint 19, and the second wire 143b is connected to the lower rotary joint 13. When the turnover piece 141 is turned over, the upper rotating joint 19 and the lower rotating joint 13 can be driven to unlock at the same time.

Alternatively, the steel wire 143 may have only one strand, and the first steel wire holes 1411 of the turnover member 141 are respectively connected to one steel wire 143, and each steel wire 143 simultaneously drives the upper revolute joint 19 and the lower revolute joint 13 to unlock.

Further, as shown in fig. 2 and 6 to 7, the lower rotary joint 13 includes a first housing 131, a second housing 132, a rotating shaft 133, a locking pin 134 and a locking groove 135;

the first housing 131 is connected with the second back 18, the second housing 132 is connected with the seat 12, the rotation shaft 133 connects the first housing 131 and the second housing 132, the first housing 131 can rotate about the rotation shaft 133, the locking pin 134 is connected with the switch unit 14 and installed between the first housing 131 and the second housing 132, and the locking groove 135 is formed on the second housing 132;

when locked, the locking pin 134 is inserted into the locking groove 135;

when unlocked, the switch unit 14 drives the locking pin 134 out of the locking groove 135.

Specifically, as shown in fig. 2, the first housing 131 and the second housing 132 are both disc-shaped, the first housing 131 and the second housing 132 are fastened to form an installation cavity, and the locking pin 134 and the locking groove 135 are both installed in the installation cavity.

The lower rotary joints 13 are provided in two, which are respectively located on the left and right sides of the second back 18 and the seat 12, and the two first housings 131 are connected by a cross bar 139, so that the cross bar 139, the two first housings 131, the second back 18, and the switch unit 14 are integrated to rotate together.

The two second housings 132 are integrally connected to the seat 12, and the second housings 132 and the seat plate 121 of the seat 12 may be integrally injection molded during the actual process.

A plurality of hollowed-out parts are formed on the seat board 121, and seat pad cloth can be coated outside the seat board 121, so that the comfort is improved. The hollow part can increase the air permeability of the seat plate 121, and can also reduce the weight and the cost. While also providing sufficient support stability.

The locking groove 135 includes three and is equally radially distributed around the center of the second housing 132. The plurality of locking slots 135 facilitates adjustment of the angle between the second back portion 18 and the seat portion 12, and the locking pin 134 can be snapped into any one of the locking slots 135 to meet different needs of the user. The user can adjust the second back 18 and the first back 11 to lie flat, half lie, sitting.

Further, as shown in fig. 6 to 7, the lower revolute joint 13 further includes a sliding groove shell 136, a sliding member 137 and a jaw plate 138, the sliding groove shell 136 is connected between the second back portion 18 and the second shell 132, wherein the sliding groove shell 136 includes a third wire hole 1362, and the other end of the second wire 143b is fixedly connected to the third wire hole 1362. The third steel wire hole 1362 of the sliding groove shell 136 is connected with the switch unit 14 through the second steel wire 143b, one end of the locking pin 134 is fixed on the sliding member 137, the other end of the locking pin passes through the limiting groove 1361 of the sliding groove shell 136 and can slide along the sliding groove shell 136, the jaw plate 138 is installed on the second housing 132, three clamping grooves 1381 completely matched with the shape of the locking groove 135 are arranged on the jaw plate 138, a plurality of clamping grooves 1381 on the jaw plate 138 correspond to the locking groove 135, and the other end of the locking pin 134 passes through the sliding groove shell 136 and then is inserted into the clamping grooves 1381 and the locking groove 135.

Specifically, the sliding groove shell 136 is fixedly connected with the lower end of the second back 18, a semicircular groove is formed on the sliding groove shell 136, the sliding member 137 is oval, and the sliding member 137 is at least partially inserted into the sliding groove shell 136.

When the second steel wire 143b is pulled, the sliding housing 136 is moved upward.

When the sliding groove shell 136 is pulled upwards, the locking pin 134 is driven to slide upwards, the locking pin 134 drives the sliding piece 137 to slide upwards, the locking pin 134 is disengaged from the locking groove 135, and the lower rotary joint 13 is unlocked.

The jaw plate 138 is connected to the second housing 132 by screws.

The sliding channel housing 136 is further connected with a reset member, which moves the sliding channel housing 136 downward when the user releases the flip member 141, keeping the locking pins 134 snapped into the catching grooves 1381 and the locking grooves 135. The reset member may be a reset spring.

In this embodiment, the sliding member 137, the sliding groove housing 136, and the locking pin 134 are integrally connected to the first housing 131, and the latch plate 138 and the locking groove 135 are integrally connected to the second housing 132. The two parts are locked by the locking pin 134 and the matching of the locking groove 135 and the clamping groove 1381, when the locking pin 134 is released from the locking groove 135 and the clamping groove 1381, the locking is realized, the second back part 18 can rotate relative to the seat part 12, and the angle adjustment or the complete folding of the second back part 18 can be realized.

Alternatively, as shown in fig. 8 to 10, the structure of the lower revolute joint 13 in the modification is schematically illustrated.

The lower rotary joint 13 includes a first housing 131, a second housing 132, a rotating shaft 133, a locking pin 134, and a locking groove 135;

when locked, the locking pin 134 is inserted into the locking groove 135;

Specifically, as shown in fig. 2 and 8, the first housing 131 and the second housing 132 are both disc-shaped, the first housing 131 and the second housing 132 are buckled to form an installation cavity, and the locking pin 134 and the locking groove 135 are both installed in the installation cavity.

As shown in fig. 9, the locking grooves 135 include four, equally radially distributed around the center of the second housing 132. The plurality of locking slots 135 facilitates adjustment of the angle between the second back portion 18 and the seat portion 12, and the locking pin 134 can be snapped into any one of the locking slots 135 to meet different needs of the user. The user can adjust the second back 18 to lie flat, semi-lie, sitting.

Further, as shown in fig. 8 to 10, the lower rotary joint 13 further includes a slide groove housing 136, a slider 137, and a jaw plate 138, the slide groove housing 136 is connected between the second back portion 18 and the second housing 132, the slider 137 is connected with the switch unit 14 and can slide along the slide groove housing 136, the jaw plate 138 is mounted on the second housing 132, a plurality of catching grooves 1381 on the jaw plate 138 correspond to the locking groove 135, one end of the locking pin 134 is mounted on the slider 137, and the other end is inserted into the catching groove 1381 and the locking groove 135.

Specifically, the sliding groove housing 136 is fixedly connected with the end of the U-shaped rod, a semicircular groove is formed on the sliding groove housing 136, the sliding member 137 is oval, and at least a part of the sliding member 137 is inserted into the sliding groove housing 136.

The sliding member 137 includes a second steel wire hole 1371, and the other end of the second steel wire 143b is fixedly connected to the second steel wire hole 1371. When the second steel wire 143b is pulled, the slider 137 is brought to slide upward.

The sliding member 137 further includes a pin hole 1372, the locking pin 134 is inserted into the pin hole 1372 and is fixedly connected, when the sliding member 137 slides upwards, the locking pin 134 is driven to slide upwards together, the locking pin 134 is released from the locking groove 135, and the lower rotary joint 13 is unlocked.

Four locking grooves 1381 completely matching the shape of the locking groove 135 are formed on the jaw plate 138, and the jaw plate 138 is connected to the second housing 132 by screws.

As shown in fig. 10, the sliding member 137 further includes a limiting block 1373, the sliding slot housing 136 is provided with a limiting slot 1361, and when the sliding member 137 slides upwards, the limiting slot 1361 plays a limiting role.

The slider 137 is further connected with a reset member, and when the user releases the flip member 141, the reset member makes the slider 137 slide down along the sliding slot housing 136, keeping the locking pin 134 snapped into the catching slot 1381 and the locking slot 135. The reset member may be a reset spring.

In the modified example, the slider 137, the slide groove case 136, and the lock pin 134 are integrally connected to the first housing 131, and the pawl plate 138, the lock groove 135, and the second housing 132 are integrally connected. The two parts are locked by the matching of the locking pin 134, the locking groove 135 and the clamping groove 1381, when the locking pin 134 is disengaged from the locking groove 135 and the clamping groove 1381, the locking is realized, the second back part 18 can rotate relative to the seat part 12, and the angle adjustment or the complete folding of the second back part 18 can be realized.

Further, as shown in fig. 11, the seat portion 12 includes a seat plate 121 and an extension rod 122, the seat plate 121 is provided with an insertion groove 1211, and the corresponding extension rod 122 is provided with an insertion block (not shown) which is inserted into the insertion groove 1211 to achieve connection between the extension rod 122 and the seat plate 121.

Optionally, the extension rod 122 can be angularly adjusted relative to the seat plate 121; when the baby sits, the extension rod 122 turns downwards, so that the lower leg of the baby can naturally bend downwards; when the baby lies, the extension rod 122 is turned upwards and maintains the same plane as the seat plate 121 for supporting the legs and feet of the baby.

Further, as shown in fig. 12 to 13, the upper rotary joint 19 includes a first rotary member 191, a second rotary member 192, and a cam 193, the first rotary member 191 being connected to the first back 11, the second rotary member 192 being connected to the second back 18, the first rotary member 191 being rotatably connected to the second rotary member 192;

when the upper rotating joint 19 is locked, the cam 193 is located between the first rotating member 191 and the second rotating member 192 in the axial direction;

the switch unit 14 can bring the cam 193 out of engagement with the first rotating member 191 or the second rotating member 192 in the axial direction, and unlock the upper rotating joint 19.

Specifically, as shown in fig. 12, the cam 193 includes a fourth wire hole 1931, and the fourth wire hole 1931 is connected to the first wire 143 a. The second rotating member 192 is provided with a cam slot 1921, the cam 193 is at least partially inserted into the cam slot 1921, the second rotating member 192 further comprises a sliding shaft 1922, and the cam 193 is sleeved on the sliding shaft 1922 and can move along the axis of the sliding shaft 1922. The first rotating member 191 is rotatably connected to the sliding shaft 1922, and the cam 193 can be at least partially inserted into the first rotating member 191.

In the locked state, a part of the cam 193 is fitted into the cam groove 1921 of the second rotating member 192, and the other part is fitted into the first rotating member 191, thereby locking the first rotating member 191 and the second rotating member 192. At this time, the first back 11 and the second back 18 are locked.

When the inverter 141 is flipped, the first wire 143a pulls the cam 193 so that the cam 193 is completely inserted into the cam groove 1921 and is disengaged from the first rotator 191. The first rotating member 191 is rotatable with respect to the second rotating member 192, and the first back portion 11 is rotatable with respect to the second back portion 18.

A reset member may be mounted between cam 193 and cam slot 1921 to compress the reset member when cam 193 is pulled toward cam slot 1921. When the first wire 143a does not apply a force to the cam 193, the cam 193 moves away from the second rotating member 192 again by the action of the reset member, and is partially inserted into the first rotating member 191, so as to lock the first rotating member 191 and the second rotating member 192.

As shown in fig. 2, a ceiling unit 17 is further attached to the seat portion 11, and the ceiling unit 17 includes a ceiling rod 171, a ceiling rotor 172, and a ceiling cloth 173.

Further, as shown in fig. 12 to 13, a ceiling rotation member 172 is further installed on an outer side of the first rotation member 191, and the ceiling rotation member 172 is rotatably connected to the first rotation member 191 and is fixedly connected to the ceiling rod 171.

The two ceiling bars 171 are used to support the ceiling cloth 173, and one side of the ceiling cloth 173 is fixed to the first back 11. The ceiling rotation member 172 is used to adjust an angle between the ceiling rod 171 and the first back 11, thereby facilitating the unfolding or folding of the ceiling cloth. When the ceiling rotor 172 rotates, the ceiling rod 171 is driven to be folded upward.

Further, as shown in fig. 7, a handle hole 1212 is formed at the rear side of the seat plate 121, and when the seat frame assembly 10 is completely folded, a hand of a user penetrates through the handle hole 1212, so as to lift the entire stroller or the entire seat frame assembly 10, thereby facilitating transportation.

By implementing the embodiment, the folding of the first back 11 relative to the second back 18 and the angle adjustment and folding of the second back 18 relative to the seat 12 can be realized, so that the flexibility of adjustment is increased, and different requirements of users can be met.

Example two:

referring to fig. 14-15, there are shown schematic structural views of a stroller frame according to a second embodiment of the present invention.

The stroller includes a stroller frame 20, the stroller frame 20 includes a push rod 21, a front support 22, a rear support 23, wheels 24, and a grab bar 27, and a seat frame assembly 10, and the seat frame assembly 10 is mounted on the stroller frame 20.

The stroller frame 20 further includes a frame turning joint 26, and the front frame 22, the rear frame 23 and the push rod 21 are connected via the frame turning joint 26 and are rotatably foldable. The folding operation of the stroller frame 20 and the seat frame assembly 10 is two completely independent modes of operation.

When it is desired to fold the entire stroller, the seat frame assembly 10 is folded first, and then the stroller frame 20 is folded.

Further, as shown in fig. 14 to 15, the front frame 22 is rotatably connected to the seat portion 12, the lower rotary joint 13 is rotatably connected to the push rod 21 via a first connecting rod 25, the grab bar 27 is rotatably connected to the seat portion 12, the grab bar 27 extends out of a second connecting rod 28, and the second connecting rod 28 is rotatably connected to the first connecting rod 25 via a third connecting rod 29.

Specifically, as shown in fig. 15, a first connection column 123 is provided on the seat portion 12, and the front bracket 22 is rotatably connected to the seat plate 121 via the first connection column 123.

Three-point positioning of the seat frame assembly 10 is achieved by the first connecting post 123, the point of connection of the grab bar 27 to the seat portion 12, and the third connecting rod 29 and the point of connection between the first connecting rod 25 and the lower revolute joint 13.

By implementing the present embodiment, the seat frame assembly 10 can be positioned, and the seat frame assembly 10 and the stroller frame 20 can be folded and folded independently, so that the adjustment flexibility is increased, and different requirements of users can be met.

Example three:

as shown in fig. 16, a seat frame assembly folding method includes the steps of:

s101: an operation switch unit 14 that unlocks the upper rotary joint 19 and the lower rotary joint 13;

s102: the first back part 11 is turned forwards and downwards, so that the first back part 11 approaches to the second back part 18;

s103: the second back 18 is flipped forward and downward so that the second back 18 approaches the seat portion 12.

Through implementing this embodiment, can realize the folding of seat frame subassembly, first back 11 is for the folding of second back 18, with second back 18 upset towards seat portion 12 is close to, and the seat frame can independently adjust folding, has increased the flexibility of adjusting, satisfies user's different demands.

Example four:

as shown in fig. 17, the method of collapsing the stroller includes the steps of:

s201: an operation switch unit 14 that unlocks the upper rotary joint 19 and the lower rotary joint 13;

s202: the first back part 11 is turned forwards and downwards, so that the first back part 11 approaches to the second back part 18;

s203: turning the second back 18 forward and downward so that the second back 18 approaches the seat portion 12;

the stroller frame 20 is folded.

Further, the step of folding the stroller frame further comprises:

s204: the push rod 21 is turned forwards and downwards, and the push rod 21 approaches the front bracket 22;

s205: the front bracket 22 is brought close to the rear bracket 23.

Through implementing this embodiment, folding the seat frame subassembly earlier, then folding baby's shallow frame, seat frame subassembly 10 folds the receipts car with baby's shallow frame 20 is independent, has increased the flexibility of adjusting, satisfies user's different demands.

The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims

1. Seat frame assembly (10) for a baby stroller, characterized in that it comprises a first back (11), a second back (18), a seat (12), a switching unit (14), an upper rotary joint (19) connecting between the first back (11) and the second back (18), and a lower rotary joint (13) connecting between the second back (18) and the seat (12), the switching unit (14) being mounted on a cross beam (16) between the first back (11) and the second back (18), the cross beam (16) being connected with the upper rotary joint (19), the switching unit (14) being able to unlock the upper rotary joint (19) and the lower rotary joint (13).

2. The seat frame assembly (10) according to claim 1,

when the folding chair is folded, after the switch unit (14) is operated, the switch unit (14) drives the upper rotating joint (19) and the lower rotating joint (13) to be unlocked, so that the first back part (11) can be folded in a rotating mode relative to the second back part (18), and the second back part (18) can be folded in a rotating mode relative to the seat part (12);

when the seat is unfolded, the first back part (11) is rotated, after the first back part (11) is rotated and unfolded to a proper position relative to the second back part (18), the upper rotating joint (19) locks the first back part (11), and after the second back part (18) is rotated and unfolded to a proper position relative to the seat part (12), the lower rotating joint (13) locks the second back part (18).

3. The seat frame assembly (10) according to claim 1, characterized in that the first back portion (11) comprises a hollow U-shaped bar, the two ends of which are connected to the two upper turning joints (19).

4. The seat frame assembly (10) according to claim 1, characterized in that the switch unit (14) comprises a flip (141), a return spring (142) and a steel wire (143), the flip (141) is rotatably connected with the cross beam (16), the return spring (142) is installed between the flip (141) and the cross beam (16), one end of the steel wire (143) is connected with the flip (141), and the other end is connected with the upper rotary joint (19) and the lower rotary joint (13);

when the turnover piece (141) is rotated, the turnover piece (141) pulls the steel wire (143), and the steel wire (143) drives the upper rotating joint (19) and the lower rotating joint (13) to be unlocked.

5. The seat frame assembly (10) of claim 4, wherein the wire (143) comprises a first wire (143a) and a second wire (143b), the first wire (143a) being connected with the upper pivot joint (19) and the second wire (143b) being connected with the lower pivot joint (13).

6. The seat frame assembly (10) according to claim 1, wherein the lower revolute joint (13) comprises a first shell (131), a second shell (132), a revolute shaft (133), a locking pin (134) and a locking groove (135);

the first housing (131) is connected to the second back portion (18), the second housing (132) is connected to the seat portion (12), the rotating shaft (133) connects the first housing (131) and the second housing (132), the first housing (131) is rotatable about the rotating shaft (133), the locking pin (134) is connected to the switch unit (14) and is installed between the first housing (131) and the second housing (132), and the locking groove (135) is formed on the second housing (132);

when locked, the locking pin (134) is inserted into the locking groove (135);

when the lock is unlocked, the switch unit (14) drives the locking pin (134) to be disengaged from the locking groove (135).

7. The seat frame assembly according to claim 6, characterized in that the lower revolute joint (13) further comprises a sliding channel shell (136), a slide (137) and a jaw plate (138), the sliding groove shell (136) is connected between the second back part (18) and the second shell (132), the sliding groove shell (136) is connected with the switch unit (14), one end of the locking pin (134) is fixed on the sliding piece (137), the other end of the locking pin passes through the limit groove (1361) of the sliding groove shell (136) and can slide along the sliding groove shell (136), the jaw plate (138) is mounted on the second housing (132), a plurality of catching slots (1381) on the jaw plate (138) correspond to the locking slots (135), the other end of the locking pin (134) passes through the sliding groove shell (136) and then is inserted into the clamping groove (138) and the locking groove (135).

8. The seat frame assembly (10) according to claim 1, characterized in that the upper revolute joint (19) comprises a first revolute member (191), a second revolute member (192) and a cam (193), the first revolute member (191) being connected with the first back portion (11), the second revolute member (192) being connected with the second back portion (18), the first revolute member (191) being rotatably connected with the second revolute member (192);

when the upper rotating joint (19) is locked, the cam (193) is located between the first rotating member (191) and the second rotating member (192) in the axial direction;

the switch unit (14) can drive the cam (193) to be separated from the first rotating piece (191) or the second rotating piece (192) along the axial direction, and the upper rotating joint (19) is unlocked.

9. The seat frame assembly (10) of claim 8, further comprising a ceiling unit (17), the ceiling unit (17) including a ceiling rod (171) and a ceiling rod swivel (172), the ceiling rod swivel (172) being rotatably connected to the first swivel (191) and fixedly connected to the ceiling rod (171).

10. A stroller comprising a stroller frame (20), the stroller frame (20) comprising a push bar (21), a front bracket (22), a rear bracket (23), wheels (24) and grab bars (27), characterized by a seat frame assembly (10) according to any of claims 1-9, the seat frame assembly (10) being mounted on the stroller frame (20).

11. The stroller of claim 10, wherein the front support (22) is rotatably connected to the seat portion (12), the lower rotary joint (13) is rotatably connected to the push rod (21) by a first connecting rod (25), the grab bar (27) is rotatably connected to the seat portion (12), the grab bar (27) extends out of a second connecting rod (28), and the second connecting rod (28) is rotatably connected to the first connecting rod (25) by a third connecting rod (29).

12. A method of folding a seat frame assembly for use in a seat frame assembly according to any one of claims 1 to 9, comprising the steps of:

-operating the switch unit (14) to unlock the upper revolute joint (19) and the lower revolute joint (13);

-turning the first back (11) forwards and downwards so that the first back (11) approaches the second back (18);

and the second back part (18) is turned forwards and downwards to enable the second back part (18) to approach the seat part (12).

13. A method of collapsing a stroller for a stroller according to claim 10 or 11, comprising the steps of:

turning the second back part (18) forwards and downwards to enable the second back part (18) to approach the seat part (12);

folding the stroller frame (20).

14. The stroller folding method of claim 13, wherein the step of folding the stroller frame further comprises:

the push rod (21) is turned forwards and downwards, and the push rod (21) approaches the front bracket (22);

the front bracket (22) and the rear bracket (23) are close to each other.