CN110667679B

CN110667679B - Seat frame assembly, stroller and folding method thereof

Info

Publication number: CN110667679B
Application number: CN201910893310.3A
Authority: CN
Inventors: 胡杰
Original assignee: Mamas and Papas Holdings Ltd
Current assignee: Mamas and Papas Holdings Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2022-01-11
Anticipated expiration: 2039-09-20
Also published as: CN110667679A

Abstract

The invention discloses a seat frame assembly for a baby stroller, which comprises a backrest part, a seat part, a switch unit and a backrest rotating joint for connecting the backrest part and the seat part, wherein the switch unit is arranged on the backrest part; when the folding seat is folded, after the switch unit is operated, the switch unit drives the backrest rotating joint to unlock, so that the backrest part can be rotationally folded relative to the seat part; when the folding seat is unfolded, the backrest part is rotated, and after the backrest part is rotated and unfolded in place relative to the seat part, the backrest rotating joint locks the backrest part. 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 backrest rotating joint is unlocked, the backrest part is rotatably folded relative to the seat part, 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 backrest part, a seat part, a switch unit and a backrest rotating joint for connecting the backrest part and the seat part, wherein the switch unit is arranged on the backrest part;

when the folding seat is folded, after the switch unit is operated, the switch unit drives the backrest rotating joint to unlock, so that the backrest part can be rotationally folded relative to the seat part;

when the folding seat is unfolded, the backrest part is rotated, and after the backrest part is rotated and unfolded in place relative to the seat part, the backrest rotating joint locks the backrest part.

Furthermore, the backrest part comprises a hollow U-shaped rod, two ends of the U-shaped rod are connected with the two backrest rotating joints, and the switch unit is installed at the top of the U-shaped rod.

Furthermore, the switch unit comprises a turnover piece, an installation piece and a steel wire, wherein the installation piece is buckled at the top of the U-shaped rod, the turnover piece is rotatably connected with the installation piece, one end of the steel wire is connected with the turnover piece, and the other end of the steel wire is connected with the backrest rotating joint;

when the turnover piece is rotated, the turnover piece pulls the steel wire, and the steel wire drives the backrest rotating joint to be unlocked.

Furthermore, a first through hole is formed in the mounting piece, a second through hole is formed in the U-shaped rod, and the steel wire penetrates through the first through hole, the second through hole and the rear portion of the U-shaped rod in sequence and is connected with the backrest rotating joint.

Further, the backrest rotation joint comprises a first shell, a second shell, a rotation shaft, a locking pin and a locking groove;

the first case is connected with the backrest part, the second case is connected with the seat part, the rotating shaft is connected with the first case and the second case, the first case can rotate around the rotating shaft, the locking pin is connected with the switch unit and is installed between the first case and the second case, and the locking groove is formed on the second case;

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

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

Further, the backrest rotating joint further comprises a sliding groove shell, a sliding piece and a jaw plate, the sliding groove shell is connected with the backrest part and between the second shells, the sliding piece is connected with the switch unit and can slide along the sliding groove shell, the jaw plate is installed on the second shells, a plurality of clamping grooves in the jaw plate correspond to the locking grooves, one end of the locking pin is installed on the sliding piece, and the other end of the locking pin is inserted into the clamping grooves and the locking grooves.

Further, the seat frame assembly further comprises a grab rail and a grab rail rotating joint;

the grab rail rotating joint comprises a pushing piece, a linkage piece, a locking piece and a connecting piece, the pushing piece is arranged in the first shell and rotates along with the first shell, the locking piece is embedded into the connecting piece and locks the connecting piece, and the connecting piece is fixedly connected with the grab rail;

when the pushing piece rotates towards the linkage piece, the linkage piece is pushed to move along a straight line, the linkage piece drives the locking piece to be separated from the connecting piece, and the grab bar and the connecting piece can be folded in a rotating mode.

Furthermore, the pushing member comprises an arc-shaped strip and a pushing block, the arc-shaped strip takes the rotation center of the first shell as the center of a circle, and the pushing block is positioned at one end of the arc-shaped strip.

Further, the linkage piece comprises a contact part and an inclined groove, the pushing block is in contact with the contact part and pushes the linkage piece to move, at least one part of the locking piece is clamped into the inclined groove, and when the linkage piece moves, the inclined groove pushes the locking piece to be pulled out of the connecting piece.

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

Furthermore, the front support is connected with the seat part, the rear support is connected with the backrest rotating joint, and the backrest rotating joint is connected with the push rod through a connecting rod.

The invention also provides a method of folding a seat frame assembly of the seat frame assembly described above, comprising the steps of:

operating the switch unit to unlock the backrest rotation joint;

and the backrest part is turned forwards and downwards to enable the backrest part to approach the seat part.

when the backrest part is turned forwards and downwards, the armrest rod rotating joint is unlocked, and the armrest rod is driven to rotate forwards and downwards to be close to the seat part.

The present invention also provides a method of collapsing a stroller for use with any of the above strollers, comprising the steps of:

operating the switch unit to unlock the backrest rotation joint;

turning the backrest part forwards and downwards to enable the backrest 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 backrest rotating joint is unlocked, the backrest part is rotatably folded relative to the seat part, 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 an expanded state in accordance with one embodiment of the present invention;

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

FIG. 4 is a side view of the seat frame assembly at the switch unit in accordance with one embodiment of the present invention;

FIG. 5 is an enlarged fragmentary view of the back portion of the seat frame assembly in accordance with one embodiment of the present invention;

FIG. 6 is an enlarged partial view of a seat frame assembly at the pivot joint of the backrest in accordance with one embodiment of the present invention;

FIG. 7 is an exploded view of a side of a seat frame assembly at the pivot joint of the backrest in accordance with one embodiment of the present invention;

FIG. 8 is an exploded view of another side of a seat frame assembly at the seat back pivot joint in accordance with one embodiment of the present invention;

FIG. 9 is an enlarged partial view of a seat frame assembly at the bar pivot joint in accordance with one embodiment of the present invention;

FIG. 10 is another enlarged partial view of the seat frame assembly at the bar pivot joint in accordance with one embodiment of the present invention;

FIG. 11 is an enlarged partial view of the seat portion of the seat frame assembly in accordance with one embodiment of the present invention;

FIG. 12 is another perspective view of a seat frame assembly in accordance with one embodiment of the present invention;

FIG. 13 is a side view of the seat frame assembly in a folded condition according to one embodiment of the present invention;

FIG. 14 is a perspective view of a seat frame assembly in a folded condition in accordance with one embodiment of the present invention;

FIG. 15 is a perspective view of a stroller in accordance with a second embodiment of the present invention;

FIG. 16 is an enlarged, fragmentary view of a front support of a stroller in accordance with a second embodiment of the present invention;

FIG. 17 is an enlarged, fragmentary view of the rear support of the stroller in accordance with a second embodiment of the present invention;

FIG. 18 is a flow chart of a method of folding a seat frame assembly according to a third embodiment of the present invention;

fig. 19 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:

the backrest part 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;

the backrest rotation 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 second steel wire hole 1371, a pin hole 1372, a limiting block 1373 and a clamping groove 1381;

the switching unit 14: the turnover part 141, the mounting part 142, the steel wire 143, the first steel wire hole 1411, and the first through hole 1421;

a grab rail 15;

grab rail rotation joint 16: the pushing member 161, the linkage member 162, the locking member 163, the connecting member 164, the arc-shaped bar 1611, the pushing block 1612, the contact part 1621 and the inclined groove 1622;

ceiling unit 17: a ceiling rod 171, a ceiling pivot joint 172;

the baby stroller frame 20: push rod 21, front support 22, rear support 23, wheel 24, connecting rod 25, frame revolute joint 26.

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 10 for a stroller, including a backrest portion 11, a seat portion 12, a switch unit 14, and a backrest rotation joint 13 connecting the backrest portion and the seat portion, the switch unit 14 being mounted on the backrest portion 11;

when the folding chair is folded, after the switch unit 14 is operated, the switch unit 14 drives the backrest rotating joint 13 to unlock, so that the backrest 11 can rotate relative to the seat 12 to be folded;

when the seat back is unfolded, the seat back 11 is rotated, and after the seat back 11 is rotated and unfolded to a proper position with respect to the seat part 12, the seat back rotation joint 13 locks the seat back 11.

Fig. 2 shows the seat frame assembly 10 in an unfolded state, when folding is required, the switch unit 14 is operated, and the switch unit 14 drives the backrest rotation joint 13 to be unlocked;

then, the backrest part 11 is rotated in a direction approaching the seat part 12 until the backrest part 11 is rotated to a horizontal position almost equal to the seat part 12.

When it is desired to unfold the seat frame assembly 10 again, the backrest portion 11 is rotated away from the seat portion 12 until the appropriate deployment angle is achieved, the backrest rotation joint 13 is locked again and the backrest portion 11 cannot rotate relative to the seat portion 12.

In this embodiment, after the backrest rotation joint 13 is unlocked, the backrest 11 is rotated and folded relative to the seat 12, so as to realize the operation of independently folding and folding the seat frame assembly 10, and the stroller frame can be independently folded or unfolded relative to the stroller frame, so that the stroller frame is convenient to adjust, and is suitable for different use states and requirements.

Further, the backrest part 11 includes a hollow U-shaped bar, both ends of the U-shaped bar are connected with two backrest rotation joints 13, and a switch unit 14 is installed on the top of the U-shaped bar.

Specifically, the backrest part 11 is a complete U-shaped rod, the U-shaped rod is arranged in an inverted manner when the backrest is unfolded, two end heads of the U-shaped rod are respectively connected with the backrest rotating joint 13, and the switch unit 14 is arranged at the top end of the middle part of the U-shaped rod, namely the highest part of the U-shaped rod when the U-shaped rod is unfolded.

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.

The deployment angle of the backrest part 11 is not limited to the angle shown in fig. 2, and the backrest part 11 may be further turned back away from the seat part 12 until it is completely laid flat, so that the infant can lie down easily.

Alternatively, the backrest portion 11 may have other structures, such as: the U-shaped bar is replaced by a back board.

Further, as shown in fig. 3 to 4, the switch unit 14 includes a flip member 141, a mounting member 142 and a steel wire 143, the mounting member 142 is fastened to the top of the U-shaped bar, the flip member 141 is rotatably connected to the mounting member 142, one end of the steel wire 143 is connected to the flip member 141, and the other end is connected to the backrest rotating joint 13;

when the turning member 141 is rotated, the turning member 141 pulls the wire 142, and the wire 142 drives the backrest rotation joint 13 to unlock.

As shown in fig. 3, the tilting member 141 is provided with first wire holes 1411 toward the front side of the seat frame assembly 10, one ends of two wires 143 are fixed in the two first wire holes 1411, respectively, and then the wire 142 passes through the mounting member 142 and enters the U-shaped bar, passes through the end of the U-shaped bar, and is connected to the backrest rotation joint 13.

In operation, a user pulls the turnover member 141 backward from the back of the seat frame assembly 10, the upper end of the turnover member 141 is hinged to the mounting member 142, the lower portion of the turnover member 141 is turned backward (right side of fig. 4), one end of the steel wire 143 is pulled backward, the other end of the steel wire 143 pulls the backrest rotation joint 13, and the backrest rotation joint 13 is unlocked.

Further, as shown in fig. 3 and 5, the mounting member 142 is provided with a first through hole 1421, the U-shaped rod is provided with a second through hole 111, and the steel wire 142 sequentially penetrates through the first through hole 1421, the second through hole 111 and the U-shaped rod and then is connected to the backrest rotation joint 13.

Further, as shown in fig. 2 and fig. 6 to 8, the back rotation joint 13 includes a first housing 131, a second housing 132, a rotation shaft 133, a locking pin 134 and a locking groove 135;

the first case 131 is connected with the backrest part 11, the second case 132 is connected with the seat part 12, the first case 131 and the second case 132 are connected by the rotation shaft 133, the first case 131 can rotate around the rotation shaft 133, the locking pin 134 is connected with the switch unit 14 and installed between the first case 131 and the second case 132, and the locking groove 135 is formed on the second case 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 two backrest rotation joints 13 are respectively positioned at the left and right sides of the backrest part 11 and the seat part 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 backrest part 11, and the switch unit 14 are integrally rotated 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.

As shown in fig. 7, the locking grooves 135 include four, equally radially distributed around the center of the second housing 132. The plurality of locking grooves 135 facilitate the adjustment of the included angle between the backrest portion 11 and the seat portion 12, and the locking pin 134 can be snapped into any one of the locking grooves 135, so as to meet different requirements of users. The user can adjust the backrest 11 to lie flat, half-lying, sitting.

Further, as shown in fig. 6 to 8, the backrest rotation joint 13 further includes a sliding groove housing 136, a sliding member 137, and a jaw plate 138, the sliding groove housing 136 is connected between the backrest part 11 and the second housing 132, the sliding member 137 is connected to the switch unit 14 and can slide along the sliding 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 sliding member 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 wire hole 1371, and the other end of the wire 143 is fixedly connected to the second wire hole 1371. When the wire 143 is pulled, the slider 137 is slid upward.

Sliding member 137 further includes a pin hole 1372, and locking pin 134 is inserted into pin hole 1372 and fixedly connected, and when sliding member 137 slides upward, locking pin 134 is driven to slide upward, and locking pin 134 is released from locking groove 135, so as to unlock backrest rotation joint 13.

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. 8, 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 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 matching of the locking pin 134 with the locking groove 135 and the clamping groove 1381, and when the locking pin 134 is released from the locking groove 135 and the clamping groove 1381, the locking is realized, the backrest part 11 can rotate relative to the seat part 12, and the angle adjustment or the complete folding of the backrest part 11 can be realized.

Further, as shown in fig. 2 and 9-10, the seat frame assembly 10 further includes a grab bar 15 and a grab bar pivot joint 16;

the grab bar rotary joint 16 comprises a pushing piece 161, a linkage piece 162, a locking piece 163 and a connecting piece 164, wherein the pushing piece 161 is installed in the first shell 131 and rotates with the first shell 131, the locking piece 163 is embedded into the connecting piece 164 and locks the connecting piece 164, and the connecting piece 164 is fixedly connected with the grab bar 15;

when the pushing member 161 rotates towards the link 162, the link 162 is pushed to move along a straight line, the link 162 drives the locking member 163 to be disengaged from the connecting member 164, and the grab bar 15 and the connecting member 164 can be folded in a rotating manner.

Specifically, a part of the link 162 is installed between the first housing 131 and the second housing 132, and a part of the link is installed inside the seat plate 121 and shielded by the shielding plate 124.

The backrest rotating joint 13 can control the grab rail rotating joint 16 through the linkage 162, and when the backrest rotating joint 13 is unlocked and the backrest 11 rotates towards the seat part 12, the grab rail rotating joint 16 is driven to be unlocked, and the grab rail 15 is turned downwards and folded.

As shown in fig. 6, the second housing 132 is provided with a guide slot 1321, and the link 162 moves linearly along the guide slot 1321.

As shown in fig. 9, the locking member 163 has a gear structure with four straight teeth, one of the teeth of the locking member 163 is inserted into the link member 162, and the link member 162 moves linearly, thereby driving the locking member 163 to be disengaged from the connecting member 164.

The remaining three teeth of the locking member 163 are fitted into the fitting grooves (not shown) of the coupling member 164, and when the three straight teeth are fitted, the locking member 163 locks the grab bar 15, and the grab bar 15 cannot be rotated. When the link 162 releases the lock piece 163 from the insertion groove, the grab bar 15 can be folded by rotation.

Since the locking member 163 has four straight teeth and is uniformly spaced, the corresponding fitting groove also has four teeth grooves. The armrest rod 15 can be rotated to adjust an angle with the seat portion 12.

As shown in fig. 6, the outer side of the seat plate 121 is opened with a mounting groove 125 corresponding to the shape of the locking member 163, wherein the lowermost tooth groove of the mounting groove 125 is opened, and a straight tooth of the locking member 163 can penetrate and act with the link 162. When the locking member 163 is released from the connecting member 164, the locking member 163 is inserted into the mounting groove 125.

Further, as shown in fig. 9, the pushing member 161 includes an arc-shaped bar 1611 and a pushing block 1612, the arc-shaped bar 1611 is centered on the rotation center of the first housing 131, and the pushing block 1612 is located at one end of the arc-shaped bar 1611.

As shown in fig. 10, the link 162 includes a contact portion 1621 and a slanted groove 1622, the pushing block 1612 contacts the contact portion 1621 and pushes the link 162 to move, one straight tooth of the locking member 163 is caught in the slanted groove 1622, and the slanted groove 1622 pushes the locking member 163 to be released from the connecting member 164 when the link 162 moves.

Specifically, when the first housing 131 is rotated clockwise in the arrow direction in fig. 9, the pushing block 1612 pushes the contact part 1621 to move rightward,

when the link 162 moves leftward in the orientation of fig. 10, the inclined groove 1622 moves the locking member 163 outward in the axial direction thereof, and is released from the insertion groove of the connecting member 164.

A reset member (not shown) is further disposed at the link 162, and when the first housing 131 is unfolded and rotates reversely, the pushing block 1612 is separated from the contact portion 1621, the link 162 is reset by the reset member, moves to the right side of fig. 10, and the inclined groove 1622 pushes the locking member 163 to return to the insertion groove, and is locked with the connecting member 164 again. The reset member may be a reset spring.

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, a ceiling unit 17 is attached to the seat portion 11, and the ceiling unit 17 includes two ceiling rods 171 and a ceiling pivot joint 172. The ceiling rods 171 are used for supporting the ceiling cloth, and the ceiling rotating joints 172 are used for adjusting the included angle between the two ceiling rods 171, so that the ceiling cloth can be unfolded or folded conveniently. The ceiling pivot joint 172 is attached to both side rods of the U-shaped bar of the backrest part 11 and pivots together with the backrest part 11. In this embodiment, when the seat frame assembly 10 needs to be folded, as shown in fig. 12, the flip member 141 of the switch unit 14 is pulled backwards, and the switch unit 14 drives the backrest rotation joint 13 to unlock;

then, the backrest part 11 is pushed to turn downwards, in the process of pushing the backrest part 11, the armrest rotating joint 16 is unlocked, and the armrest rod 15 is pushed to turn downwards together. Until the grab bar 15 and the backrest part 11 are completely folded.

As shown in fig. 13-14, the ceiling poles 171 may be folded upside down.

As shown in fig. 12 and 14, 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 user's hand can be inserted into the handle hole 1212 to lift the entire stroller or the entire seat frame assembly 10, thereby facilitating transportation.

By implementing this embodiment, the angle adjustment and the complete folding of the backrest portion 11 with respect to the seat portion 12 can be achieved, and the angle adjustment and the complete folding of the grab bar 15 with respect to the seat portion 12 can also be achieved. The flexibility of adjustment is increased, and different requirements of users can be met.

Example two:

fig. 15-17 are 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, and wheels 24, 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. 16 to 17, the front bracket 22 is connected to the seat portion 12, the rear bracket 23 is connected to the back pivot joint 13, and the back pivot joint 13 is connected to the push rod 21 via the connecting rod 25.

Specifically, as shown in fig. 16, the seat portion 12 is provided with a first connecting column 123, and the front bracket 22 is rotatably connected with the seat plate 121 through the first connecting column 123;

as shown in fig. 17, a second connecting column 1322 is provided on the second housing 132 of the backrest rotation joint 13, and the rear bracket 23 is rotatably connected to the backrest rotation joint 13 through the second connecting column 1322.

The second housing 132 of the backrest rotation joint 13 is also rotatably connected to the push rod 21 via the connecting rod 25.

When the stroller frame 20 is unfolded, the first connecting post 123, the second connecting post 1322 and the connecting rod 25 serve as a three-point positioning for the seat frame assembly 10, and the relative positions of the seat frame assembly 10 and other components of the stroller frame 20 are maintained.

When the stroller frame 20 is folded, the respective coupling points of the first coupling post 123, the second coupling post 1322 and the coupling rod 25 are rotated, and the seat frame assembly 10 is rotated with respect to the push rod 21, the front bracket 22 and the rear bracket 23.

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. 18, a method of folding a seat frame assembly includes the steps of:

s101: an operation switch unit 14 that unlocks the backrest rotation joint 13;

s102: the backrest part 11 is turned forward and downward so that the backrest part 11 approaches the seat part 12.

Further, the seat frame assembly 10 further includes a grab bar 15 and a grab bar turning joint 16;

s103: when the backrest part 11 is turned forwards and downwards, the unlocking grab bar 15 rotates the joint, and drives the grab bar 15 to rotate forwards and downwards to approach the seat part 12.

By implementing this embodiment, the seat frame assembly can be folded, the backrest portion 11 can be tilted toward the seat portion 12, and the grab bar 15 can be tilted downward toward the seat portion 12. The seat frame can be independently adjusted and folded, so that the adjustment flexibility is improved, and different requirements of users are met.

Example four:

as shown in fig. 19, the method of collapsing the stroller includes the steps of:

s201: an operation switch unit 14 that unlocks the backrest rotation joint 13;

s202: the backrest part 11 is turned forward and downward, so that the backrest part 11 approaches the seat part 12;

the stroller frame 20 is folded.

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

s203: the push rod 21 is turned forwards and downwards, and the push rod 21 approaches the front bracket 22;

s204: 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. A seat frame assembly (10) for a stroller, comprising a backrest part (11), a seat part (12), a switch unit (14) and a backrest swivel joint (13) connecting the backrest part (11) and the seat part (12), the switch unit (14) being mounted on the backrest part (11);

when the folding seat is folded, after the switch unit (14) is operated, the switch unit (14) drives the backrest rotating joint (13) to unlock, so that the backrest (11) can be rotatably folded relative to the seat part (12);

when the folding backrest is unfolded, the backrest part (11) is rotated, after the backrest part (11) is rotated and unfolded to a proper position relative to the seat part (12), the backrest rotating joint (13) locks the backrest part (11),

wherein the seat frame assembly (10) further comprises a grab bar (15) and a grab bar revolute joint (16);

the grab rail rotating joint (16) comprises a pushing piece (161), a linkage piece (162), a locking piece (163) and a connecting piece (164), the pushing piece (161) is installed in a first shell (131) of the backrest rotating joint (13) and rotates along with the first shell (131), the locking piece (163) is embedded into the connecting piece (164) and locks the connecting piece (164), and the connecting piece (164) is fixedly connected with the grab rail (15);

when the pushing piece (161) rotates towards the linkage piece (162), the linkage piece (162) is pushed to move along a straight line, the linkage piece (162) drives the locking piece (163) to be separated from the connecting piece (164), and the grab bar (15) and the connecting piece (164) can be folded in a rotating mode.

2. The seat frame assembly (10) according to claim 1, characterized in that the backrest part (11) comprises a hollow U-shaped bar, the two ends of which are connected to the two backrest swivel joints (13), the switch unit (14) being mounted on top of the U-shaped bar.

3. The seat frame assembly (10) according to claim 2, characterized in that the switch unit (14) comprises a flip (141), a mounting member (142) and a steel wire (143), the mounting member (142) is snapped on top of the U-shaped bar, the flip (141) is pivotally connected to the mounting member (142), one end of the steel wire (143) is connected to the flip (141) and the other end is connected to the backrest pivot 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 backrest rotating joint (13) to be unlocked.

4. A seat frame assembly according to claim 3, wherein the mounting member (142) is provided with a first through hole (1421), the U-shaped bar is provided with a second through hole (111), and the steel wire is connected to the backrest rotation joint (13) after sequentially passing through the first through hole (1421), the second through hole (111) and the U-shaped bar.

5. The seat frame assembly (10) according to claim 1, wherein the backrest swivel joint comprises a first housing (131), a second housing (132), a swivel shaft (133), a locking pin (134) and a locking groove (135);

the first case (131) is connected to the backrest portion (11), the second case (132) is connected to the seat portion (12), the rotation shaft (133) connects the first case (131) and the second case (132), the first case (131) is rotatable about the rotation shaft, the locking pin (134) is connected to the switch unit (14) and installed between the first case (131) and the second case (132), and the locking groove (135) is formed on the second case (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).

6. The seat frame assembly of claim 5, wherein the backrest rotation joint (13) further comprises a sliding groove shell (136), a sliding member (137), and a jaw plate (138), the sliding groove shell (136) being connected between the backrest portion (11) and the second housing (132), the sliding member (137) being connected with the switch unit (14) and being slidable along the sliding groove shell (136), the jaw plate (138) being mounted on the second housing (132), a plurality of catching grooves (1381) on the jaw plate (138) corresponding to the locking grooves (135), one end of the locking pin (134) being mounted on the sliding member (137), the other end being inserted into the catching grooves and the locking grooves (135).

7. The seat frame assembly (10) according to claim 1, wherein the pusher (161) comprises an arcuate strip (1611) and a pushing block (1612), the arcuate strip (1611) centered about a center of rotation of the first housing (131), the pushing block (1612) located at one end of the arcuate strip (1611).

8. The seat frame assembly (10) of claim 7, wherein the link (162) includes a contact portion (1621) and a diagonal slot (1622), the push block (1612) contacts the contact portion (1621) and pushes the link (162) to move, at least a portion of the lock (163) snaps into the diagonal slot (1622), and the diagonal slot (1622) pushes the lock (163) out of the connector (164) as the link (162) moves.

9. A stroller comprising a stroller frame (20), the stroller frame (20) comprising a push bar (21), a front bracket (22), a rear bracket (23) and wheels (24), characterized by a seat frame assembly (10) according to any of claims 1-8, the seat frame assembly (10) being mounted on the stroller frame (20).

10. Stroller according to claim 9, characterized in that the front support (22) is connected to the seat part (12), the rear support (23) is connected to the backrest swivel joint (13), and the backrest swivel joint (13) is connected to the push rod (21) via a connecting rod (25).

11. A method of folding a seat frame assembly for use in a seat frame assembly according to any one of claims 1 to 8, comprising the steps of:

operating the switch unit (14) to unlock the backrest swivel joint (13);

the backrest part (11) is turned forward and downward, and the backrest part (11) is made to approach the seat part (12).

12. The seat frame assembly folding method according to claim 11, characterized in that the seat frame assembly (10) further comprises a grab bar (15) and a grab bar swivel joint (16);

when the backrest part (11) is turned forwards and downwards, the armrest rod rotating joint (16) is unlocked, and the armrest rod (15) is driven to rotate forwards and downwards to be close to the seat part (12).

13. A method of collapsing a stroller for a stroller according to claim 9 or 10, comprising the steps of:

operating the switch unit (14) to unlock the backrest swivel joint (13);

turning the backrest part (11) forwards and downwards to enable the backrest part (11) 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.