GB2523251A

GB2523251A - Stroller frame

Info

Publication number: GB2523251A
Application number: GB1500869.1A
Authority: GB
Inventors: Jian-Qun Li
Original assignee: Wonderland Nurserygoods Co Ltd Hong Kong
Current assignee: Wonderland Nurserygoods Co Ltd Hong Kong
Priority date: 2014-01-21
Filing date: 2015-01-19
Publication date: 2015-08-19
Anticipated expiration: 2035-01-19
Also published as: GB201500869D0; CN104787104A; CN104787104B; DE102015200887B4; GB2523251B; DE102015200887A1

Abstract

A stroller frame including a bottom member 40, a handle 20, a supporting component 30, a linking assembly 50, a front leg 10 with a front wheel assembly (122, Fig.7), and a rear leg 60 with a rear wheel assembly (62). The front leg is pivoted to the bottom member at a first point A1 and to the handle at a second point A2. The supporting component is pivoted to the handle at a third point A3, to the bottom member at a fourth point A4, and to the linking assembly at a fifth point A5. The rear leg is pivoted to the linking assembly at a sixth point A6 and to the bottom member at a seventh point A7. A first four-bar mechanism including the first to the fourth points is linked with a second four-bar linkage mechanism including the fourth to the seventh points for folding or unfolding the front and the rear wheel assembly when the stroller frame is folded or unfolded. The linking assembly may be sprung and comprise a first and second connecting component (52, 54, Fig. 5). A locking member may be provided between the front leg and handle to maintain the frame in an unfolded state.

Description

STROLLER FRAME

Fec croLj.nu of the Invent:on :L. Fi.eld of the Tnve:n.tlc.:n.

The present invention relates to a stroller frame, and more particularly, to a stroller frame capable of being folded quickly and folding a front wheel assembly and a rear wheel assembly automatically.

2 liescrle t ion of the Pr icr In order to satisfy practicality and portability of a stroller as consumers' reques, a stroller frame is usually designed to be foldable, such that the stroller frame can be unfolded to allow a baby to sit inside when it is required to use the stroller frame, and the stroller frame can be folded to be stored or carried easily when it is not required to use the stroller frame.

In order to fold the stroller frame, a plurality of pivotal connecting mechanisms is disposed on the conventional stroller frame. It not only complicates structure of the conventional stroller frame but also causes an inconvenience in folding operation because it is required to operate the plurality of pivotal connecting mechanisms for folding the conventional stroller frame separately. Furthermore, a front wheel assembly and a rear wheel assembly of the conventional stroller frame are positioned outside the conventional stroller frame after the conventional stroller frame is folded, such that the folded conventional stroller still occupies too much space, which is a disadvantage of the conventional stroller frame when it is required to store or transport the conventional stroller.

Therefore, in order to solve the above-mentioned drawbacks, there is a need to develop a stroller frame with simple structure and easy operation.

Sumuary (1:11 tills lnve.ntion In order to solve the above drawbacks, the present invention aims at providing a stroller frame with simple structure and easy operation, capable of being folded guickly and folding a front wheel assembly and a rear wheel assembly automatically.

According to the claimed invention, a stroller frame includes two lateral frames arid at least one connecting rod.

Each lateral frame includes a front leg, a bottom member, a handle, a supporting component, a linking assembly, and a rear leg. A lower end of the front leg is connected to a front wheel assembly. A front end of the bottom member is pivoted to the front leg at a first pivoting point. An upper end of the front leg is pivoted to a lower end of the handle at a second pivoting point. An upper end of the supporting component is pivoted to the handle at a third pivoting point, and the supporting component is pivoted to the bottom member at a fourth pivoting point near a lower end of the supporting component. The lower end of the supporting component is pivoted to an upper end of the linking assembly at a fifth pivoting point. A lower end of the rear leg is connected to a rear wheel assembly.

A lower end of the linking assembly is pivoted to the rear leg at a sixth pivoting point, and the rear leg is pivoted to a rear end of the bottom member at a seventh pivoting point.

The connecting rod is connected between the two lateral frames.

When the stroller frame is folded or unfolded, the front wheel assembly and the rear wheel assembly are folded at the same time.

According to the claimed invention, the linking assembly includes a spring, a first connecting component, and a second connecting component. The first connecting component is movably connected to the second connecting component. An upper end of the first connecting component is pivoted to the supporting component at the fifth pivoting point. A lower end of the second connecting component is pivoted to the rear leg at the sixth pivoting point, and two ends of the spring are connected to the first connecting component and the second connecting component, respectively.

According to the claimed irvention, the second ccnnecting component is sleeved on the first connecting component and slidable relative to the first connecting component.

According to the claimed invention, a bottom member connecting portion is protruded down from the rear end of the bottom member, and the rear leg comprises a connecting piece pivoted to the bottom member connecting portion at the seventh pivoting point.

According to the claimed invention, the handle is pivoted to the front leg by a handle joint located at the lower end of the handle and a front leg joint located at the upper end of the front leg, and a locking member is disposed between the handle joint and the front leg joint for locking the stroller frame in a unfolding status.

According to the claimed invention, the connecting rod comprises a driving component for driving the locking member to unlock the stroller frame, so as to fold the stroller frame.

According to the claimed invention, the handle joint and the front leg joint are pivotally connected to the by a shaft, and the locking member is movable along the shaft.

According to the claimed invention, wherein the locking member comprises a locking portion, a first accommodation is formed on the front leg joint, a second accommodation is formed on a location of the handle joint opposite to the first accommodation, and the locking portion is slidably accommodated in a space between the first accommodation and the second accommodation.

According to the claimed invention, the locking member further comprises a driving portion protruded from a side of the locking portion away from the first accommodation, and the driving portion abuts against the driving component.

According to the claimed invention, the driving component comprises an inclined surface, and the driving portion comprises a pin for abutting against the inclined surface.

According to the claimed invention, a positioning column is disposed on the handle joint, and a third accommodation is formed on the positioning column for allowing the driving portion to slide along a locking direction of the locking member.

According to the claimed invention, a through hole is formed on the driving portion, and the pin is passing through the through hole and protruded from the positioning column.

According to the claimed invention, the driving component is sleeved on the positioning column, and the inclined surface is extended at an obligue angle relative to the third accommodation.

According to the claimed invention, the driving component is rotatable around the lockinc member for driving the looking member to move along a direction perpendicular to a rotating direction of the driving component, so as to lock or unlock the stroller frame.

According to the claimed invention, the stroller frame comprises a plurality of connecting rods, the two bottom members of the two lateral frames and one of the plurality of connecting rods are integrated in a U shape, and the two rear leg of the two lateral frames and another one of the plurality of connecting rods are integrated in a U shape.

According to the claimed invention, the front wheel assembly and the rear wheel assembly are folded toward the bottom member when the handle pivots relative to the front leg for folding the stroller frame.

According to the claimed invention, the first pivoting point, the second pivoting point, the third pivoting point, and the fourth pivoting point form four jointing points of a first four-bar linkage mechanism. The fourth pivoting point, the fifth pivoting point, the sixth pivoting point, and the seventh pivoting point form four jointing points of a second four-bar linkage mechanism, and the first four-bar linkage mechanism is linked with the second four-bar linkage mechanism for folding or unfolding the front wheel assembly and the rear wheel assembly when the stroller frame is folded or unfolded.

In suimnary, the present invention provides the stroller frame with simple structure and easy operation by utilizing the first four-bar linking mechanism and the second four-bar linking mechanism linked with each other, such that the front wheel assembly and the rear wheel assembly of the stroller frame can be folded simultaneously when the stroller frame

S

is folded, which reduces a space occupied by the stroller and allows users to transport or store the stroller frame easily.

ISrief he scriuLionoi the II'rawinos FIG. 1 is a perspective diagram of a stroller frame in an unfolding status at a back view according to an embodiment of the present invention.

FIG. 2 is a perspective diagram of the stroller frame in the unfolding status at a lateral view according to the embodiment of the present invention.

FIG. 3 is an enlarged diagram of aportionAof the stroller frame shown in FIG. 2 according to the embodiment of the present invention.

FIG. 4 is a perspective diagram of the stroller frame in the unfolding status at a bottom view according to the embodiment of the present invention.

FIG. 5 is a diagram of a linking assembly of the stroller frame according to the embodiment of the present invention.

FIG. 6 is a perspective diagram of the stroller frame during a folding process according to the embodiment of the present invention.

FIG. 7 is a perspective diagram of the stroller frame as the stroller frame has been folded according to the embodiment of the present invention.

FIG. Bisa partial exploded diagram of a driving component and a driving rod of the stroller frame according to the embodiment of the present invention.

FIG. 9 is an enlarged diagram of a portion B of the stroller frame shown in FIG. 8 according to the embodiment of the present invention.

FIG. 10 is a partial exploded diagram of the stroller frame according to the embodiment cf the present invention.

FIG. 11 is an enlarged diagram of a portion C of the stroller frame shown in FIG. 10 according to the embodiment of the present invention.

Detal led Description

Please refer to FIG. 1 to FIG. 8. FIG. 1 is a perspective diagram of a stroller frame 1 in an unfolding status at a back view according to an embodiment of the present invention. FIG. 2 is a perspective diagram of the stroller frame 1 in the unfolding status at a lateral view according to the embodiment of the present invention. FIG. 3 is an enlarged diagram of a portion A of the stroller frame 1 shown in FIG. 2 according to the embodiment of the present invention. FIG. 4 is a perspective diagram of the stroller frame 1 in the unfolding status at a bottom view according to the embodiment of the present invention. FIG. 5 is a diagram of a linking assembly of the stroller frame 1 according to the embodiment of the present invention. FIG. 6 is a perspective diagram of the stroller frame 1 during a folding process according to the embodiment of the present invention. FIG. 7 is a perspective diagram of the stroller frame 1 as the stroller frame 1 has been folded according to the embodiment of the present invention. FIG. 8 is a partial exploded diagram of a driving component 724 and a driving rod 72 of the stroller frame 1 according to the embodiment of the present invention. The stroller frame 1 includes two lateral frames 100 and at least one connecting rod 70 connected between the two lateral frames 100, as shown in FIG. 8. Each lateral frame 100 includes a front leg 10, a bottom member 40, a handle 20, a supporting component 30, a linking assembly 50, and a rear leg 60. A lower end of the front leg 10 is connected to a front wheel assembly 122, as shown in FIG. 7. A connecting plate 64 is formed at an upper end of the rear leg 60. An upper end of the connecting plate 64 is defined as an upper connecting portion 642. A lower end of the connecting plate 64 is defined as a lower connecting portion 644. A lower end of the rear leg 60 is connected to a rear wheel assembly 62, as shown in FIG. 7.

A front end of the bottom member 40 is pivoted to The front leg 10 at a first pivoting point Al. An upper end of the front leg 10 is pivoted to a lower end of the handle 20 at a second pivoting point A2. Ai-i upper end of the supporting component is pivoted to the handle 20 at a third pivoting point A3.

A lower end of the supporting component 30 is pivoted to the bottom member 40 at a fourth pivoting point A4. The first pivoting point Al, the second pivoting point A2, the third pivoting point A3, and the fourth pivoting point A4 form four points of a first four-bar linkage mechanism Bl. A lower end of the supporting component 30 is extended to a location under the bottom member 40 and pivoted to an upper end of the linking assembly 50 at a fifth pivoting point A5. A lower end of the linking assembly 50 is pivoted to the lower connecting portion 644 of the connecting plate 64 at a sixth pivoting point A6.

The upper connecting portion 642 of the rear leg 60 is pivoted to a rear end of the bottom member 40 at a seventh pivoting point A7. The fourth pivoting point A4, the fifth pivoting point AS, the sixth pivoting point A6, and the seventh pivoting point A7 form four points of a second four-bar linkage mechanism 32. The first four-bar linkage mechanism 31 is linked with the second four-bar linkage mechanism 32 for folding or unfolding the front wheel assembly 122 and the rear wheel assembly 62 when the stroller frame 1 is folded or unfolded. In other embodiments, the connecting plate 64 and the rear leg 60 can be integrated. The connecting plate 64 facilitates the rear leg 60 to be pivoted to the linking assembly 50 and the bottom member 40 easily. Alternatively, the connecting plate 64 can be omitted, and the linking assembly 50 and the bottom 40 are pivoted to two different locations of the rear leg 60 at the sixth pivoting point A6 and the seventh pivoting point A7 respectively. a

In this embodiment, the handle 20, the front leg 10, the bottom member 40, and the supporting component 30 are linked with one another and form the first four-bar linkage mechanism 31. The bottom member 40, the supporting component 30, the linking assembly 50, and the rear leg 60 are linked with one another and form the second four-bar linkage mechanism B2.

Both of the first four-bar linkage mechanism 31 and the second four-bar linkage mechanism 32 include the bottom member 40 and the supporting component 30, so the first four-bar linkage mechanism B1 is linked with the second four-bar linkage mechanism 82 via the bottom member 40 and the supporting component 30. In other words, the stroller frame 1 is driven to be folded or unfolded by the first four-bar linkage mechanism 81 and the second four-bar linkage mechanism 82, such that the stroller frame I is with simple structure and easy operation. Furthermore, the lower end of the front leg is assembled with the front wheel assembly 122, and the lower end of the rear leg 60 is assembled with the rear wheel assembly 62.

Please refer to FIG. 1 to FIG. 4. Tn this embodiment, the at least one connecting rod 70 connected between the two lateral frames 100 includes the driving rod 72, a first connecting rod 74, a second connecting rod 76, and a third connecting rod 78. The driving rod 72 is connected between the two second pivoting points A2. The first connecting rod 74 is connected between the lower ends of the two front legs 10. The second connecting rod 76 is connected between the rear ends of the two bottom members 40. The third connecting rod 78 is connected between the upper ends of the two rear legs 60. Preferably, the first connecting rod 74 and the two front legs 10 can be integrated and formed in a U-shaped pipe. The second connecting rod 76 and the two bottom members 40 can be integrated and formed in a U-shaped pipe. The third connecting rod 78 and the two rear legs 60 can be integrated and formed in a U-shaped pipe. However, the connecting rod of the present invention is not limited to the aforementioned embodiment. For example, any of the first connecting rod 74, the second connecting rod 76, and the third connecting rod 78 can be omitted, such that the connecting rod 70 includes only the driving rod 72, or a ccnnecting position of the connecting rcd 70 can be changed.

Please refer to FIG. 1 to FIG. 7. A front wheel installing portion 12 is disposed at the lower end of the front leg 10 for installing the front wheel assembly 122. The rear leg 60 is bent. The upper end of the rear leg 60 is substantially horizontal, and the lower end cf the rear leg is extended down for assembling the rear wheel assembly 62. The upper ends of the two rear legs 60 are connected by the third connecting rod 78. As shown in FIG. 1 to FIG. 4, the stroller frame 1 is in the unfolding status. The front leg 10 and the handle are located in the same straight line, i.e., the first pivoting point Al, the second pivoting point A2, and the third pivoting point A3 are located in the same line. Meantime, the first pivoting point Al, the third pivoting point A3, and the fourth pivoting point A4 form three points of a triangular structure, for stability. In the present invention, a locking member 22 is disposed at the pivoting point A2 where the front leg 10 is pivoted to the handle 20, such that the stroller frame 1 can be locked in the unfolding status, to maintain the stable triangular structure.

In this embodiment, the linking assembly 50 includes a shock-absorbing mechanism for providing a shock-absorbing function for the rear wheel assembly 62. Specifically, as shown in FIG. 5, the linking assembly 50 includes a first connecting component 52 and a second connecting component 54.

The first connecting component 52 is slidably connected to the second connecting component 54. An upper end of the first connecting component 52 is pivoted to the lower end of the supporting component 30. A lower end of the second connecting component 54 is pivoted to the lower connecting portion 644 of the rear leg 60. A lower end of the first connecting component 52 is siidably connected to an upper end of the second connecting component 54. The first connecting component 52 and the second connecting component can be slidably connected to each other as shown in FIG. Sorby configuration of a sliding slot and a sliding rail. Specifically, the second connecting component 54 is sleeved on the first connecting component 52 and slidable relative to the first connecting component 52.

Positions of the second connecting component 52 and the first connecting component 54 can be exchanged with each other. A spring 56 is disposed between the first connecting component 52 and the second connecting component 54. Ar' end of the spring 56 is fixed on the lower end of the first connecting component 52, and the other end of the spring 56 is fixed on or abutted against the upper end of the second connecting component 54.

As shown in FIG. 1 to FIG. 5, when the stroller frame 1 is in the unfolding status, since the front leg 10 and the handle 20 are looked by the locking member 22 so as not to rotate, the first four-bar linkage mechanismBl is stabilized.

Furthermore, since the bottom member 40 and the supporting component 30 cannot be rotated, the second four-bar linkage mechanism 32 is stabilized as well. However, the rear leg 60 can rotate relative to the seventh pivoting point A7 as the first connecting component 52 and the second connecting component 54 of the linking assembly 50 are slidable relative to each other. Therefore, when the ground is uneven so that the rear wheel assembly 62 receives an impact from the ground, the first connecting component 52 slides relative to the second connecting component 54, such that the spring 56 disposed therebetween is compressed or extended to absorb part of the impact, which provides the shock-absorbing function and enhances comfort of the stroller frame 1.

Detailed structure of the second four-bar linkage mechanism 32 is described as below. As shown in FIG. 1 to FIG. 4, the lower end of the supporting component 30 is bent inward to a middle portion between the two bottom members 40. A coupling component 32 is disposed at the lower end of the supporting component 30. The coupling component 32 includes two coupling plates 322 opposite to each other. The coupling plate 322 is extended backward. The upper end of the first connecting component 52 is accommodated between and pivoted to the two coupling plates 322. The lower end of the supporting component 30 is bent inward, such that the supporting component 30, the bottom member 40, the linking assembly 50, and the rear leg 60 of the second four-bar linkage mechanism B2 are not in a same surface. Therefore, an interference of components of the stroller frame 1 can be avoided when folding the stroller frame 1, and the stroller frame 1 can be folded more completely during the folding process. The connecting plate 64 is formed at the upper end of the rear leg 60. The connecting plate 64 and the rear leg 60 can be integrated or fixed by a welding, screwing, or engaging manner. In this embodiment, the two rear legs 60, the two connecting plates 64, and the third connecting rod 78 are integrated. The connecting plate 64 is formed in a flat piece, and the upper connecting portion 642 and the lower connecting portion 644 are formed on the connecting plate 64. The lower connecting portion 644 is pivoted to the second connecting component 54 at the sixth pivoting point A6. The upper connecting portion 642 is pivoted to the rear end of the bottom member 40 at the seventh pivoting point A7. More specifically, a bottom member connecting portion 42 is protruded down from the rear end of the bottom member 40. The bottom member connection portion 42 is formed in a rod shape and connected to the bottom member or integrated with the bottom member 40. If there is the second connecting rod 76 disposed between the rear ends of the two bottom members 40, the bottom member connecting portion 42 is positioned under the second connecting rod 76.

The two upper connecting portions 642 are pivoted to two sides of the bottom member connecting portion 42 respectively.

Specifically, the supporting component 30 is intersecting with and pivoted to the bottom member 40 at the fourth pivoting point A4. The coupling plate 322 of the coupling component 32 Is pivoted to the upper end of the first connecting component 52 at the fifth pivoting point AS. The coupling component 32 is fixed on the lower end of the supporting component 30. The first connecting component 52 is slidably connected to the second connecting component 54. The second connecting component 54 is pivoted to the lower connecting portion 644 of the connecting plate 64 at the sixth pivoting point A6.

The upper connecting portion 642 of the connecting plate 64 is pivoted to the bottom member connecting portion 42 at the seventh pivoting point A7. The connecting plate 64 is fixed on the rear leg 60. The bottom member connecting portion 42 is fixed on the bottom member 40. The fourth pivoting point A4, the fifth pivoting point AS, the sixth pivoting point A6, and the seventh pivoting point A7 form the four points of the second four-bar linkage mechanism 32. By the second four-bar linkage mechanism 32, the rear leg 60 can be rotated to a bottom side of the bottom member 40 so as to fold the rear wheel assembly 62 and to absorb an impact from the ground when used to enhance the comfort of the stroller frame 1.

The operation principle of locking and unlocking of the stroller frame is described as follows. Please refer to FIG. 8 to FIG. 11. FIG. 9 is an enlarged diagram of a portion B of the stroller frame 1 shown in FIG. 8 according to the embodiment of the present invention. FIG. 10 is a partial exploded diagram of the stroller frame 1 acoording to the embodiment of the present invention. FIG. 11 is an enlarged diagram of a portion C of the stroller frame 1 shown in FIG. acoording to the embodiment of the present invention. FIG. 11 is an enlarged diagram of a portion C of the stroller frame 1 shown in FIG. 10 according to the embodiment of the present invention. The handle 20 is pivoted to the front leg 10 by a handle joint 21 located at the lower end of the handle 20 and a front leg joint 14 located at the upper end of the front leg 10. A first accommodation 142 and a second accommodation (not shown in figures) are formed on a side of the front leg joint and a side of the handle joint opposite to each other.

The locking member 22 of the stroller frame 1 is designed for locking the stroller frame 1 in the unfolding status or for unlocking the stroller frame 1 to be folded. The locking member 22 includes a locking portion 222 and a driving portion. The locking portion 222 is accommodated in a space between the first accommodation 142 and the second accommodation. In this embodiment, the driving portion is composed of two locking columns 224 opposite to each other. The locking column 224 is protruded outward from a side of the locking portion 222 away from the first accommodation 142. The locking portion 222 has predetermined thickness to be accommodated in the second accommodation only for unlocking and folding the stroller frame 1, or to be accommodated between the first accommodation 142 and the second accommodation for locking the stroller frame 1. The locking column 224 is formed in a slender rod shape. The locking column 244 is passing through the second accommodation and protruded toward an inside of the stroller frame 1, i.e., an end of the locking column 244 and the locking portion 222 are located at two opposite sides of the handle joint 21 respectively.

Specifically, a positioning column 26 is disposed on a side of the handle joint 21 away from the first accommodation 142. An extending direction of the positioning column 26 is the same as an extending direction of the locking column 224.

Two third accommodations 262 are formed on the positioning column 26 for allowing the two locking columns 2244 of the locking member 22 to slide. The third accommodation 262 is communicated with the second accommodation. A pin 28 is inserted through two through holes 224a of the two locking columns 224 and protruded from the positioning column 26. The two third accommodations 262 are at least partially communicated with each other for allowing the pin 28 to slide along the third accommodation 262 to drive the locking member 22 to move within the space between the first accommodation 142 and the second accommodation, which allows the locking member 22 to be at a locking position and unlocking position.

Preferably, as shown in FIG. 8 to FIG. 11, the positioning column 26 is a hollow cylinder. The third accommodation 262 is formed on a wall of the hollow cylinder. The pin 28 drives the locking column 224 to slide along the third accommodation 262. Preferably, the pin 28 drives the locking colunn 224 by the driving component 724, such that the locking member 22 is driven to unlock the stroller frame 1 for folding the stroller frame 1.

Specifically, the driving component 724 is disposed on each end of the driving rod 72 and sleeved on the positioning column 26. The driving component 724 can rotate around the positioning column 26. The driving component 724 includes a driving body 7244, two sloping blocks 7241, and an installing plate 7246. The driving body 7244 is formed in a ring shape.

The two sloping blocks 7241 are disposed opposite to each other.

The sloping block 7241 is extended from the driving body 7244 along a direction of the positioning column 26, and an inclined surface 7242 is formed on an inclined side wall of the sloping block 7241. The inclined surface 7242 is extended at an oblique angle relative to the extending direction of the third accommodation 262. The pin 28 abuts against the inclined surface 7242. Agap 7248 is formed between the installing plate 7246 and the sloping block 7241 for allowing a pipe wall of the driving rod 72 to pass through. Specifically, the driving rod 72 is a hollow structure. Two ends of the driving rod 72 are sleeved on the corresponding sloping blocks 7241 respectively. The pipe wall of the driving rod 72 is inserted into the gap 7248 between the installing plate 7246 and the sloping block 7241. The driving rod 72 and the installing plate 7246 are fixed together. The driving component 724 is driven to rotate relative to the positioning column 26 by the driving rod 72, such that the pin 28 is driven to slide along the third accommodation 262 by the inclined surface 7242, so that the locking member 22 is moved tcward the unlocking position.

Specifically, as shown in FIG. 6 and FIG. 7, after the front leg 10 and the handle 20 are unlocked, the front leg and the handle 20 can be rotated around the second pivoting point A2. Meantime, the first four-bar linkage mechanism Bl and the second four-bar linkage mechanism B2 are linked with each other, and the stroller frame 1 can be folded smoothly.

As shown in FIG. 6, if the bottom member 40 is considered as a reference object, the second pivoting point A2 rotates forwardly relative to the first pivoting point Al (in a counterclockwise direction shown in FIG. 6) . The third pivoting point A3 rotates forwardly relative to the fourth pivoting point A4. After rotating, the front leg 10, the handle 20, and the supporting component 30 are folded toward the bottom member 40. specifically, the front leg 10 rotates around the first pivoting point Al along the counterclockwise direction shown in FIG. 6, so that the lower end of the front leg 10 is under the bottom member 40 after rotating.

Furthermore, the supporting component 30 rotates around the fourth pivoting point A4 along the counterclockwise direction shown in FIG. 6. By the second four-bar linkage mechanism B2, the rear leg 60 rotates clockwise around the seventh pivoting point A7 toward the bottom side of the bottom member 40 as shown in FIG. 6, so as to fold the rear wheel assembly 62 installed at the lower end of the rear leg 60. The folded stroller frame 1 is shown in FIG. 7. The folding process of the stroller frame 1 is easy and quick. The front wheel assembly 122 and the rear wheel assembly 62 can be folded at the same time, so as to reduce a size of the folded stroller frame 1.

Therefore, the stroller frame 1 can be folded to be stored or carried easily.

Furthermore, holes 222a, 14a are formed on the locking portion 222 and the front leg joint 14 respectively for allowing a shaft (not shown in figures) pivoting to the handle joint 21 and the front leg joint 14 to pass through. The locking member 22 can slide along a direction of the shaft, and the shaft can prevent disassembly of the handle joint 21 and the front leg joint 14.

The operating process of using the driving rod 72 to fold or unfold the stroller frame is described as follows. When it is desired to fold the stroller frame 1 in the unfolding status, as shown in FIG. 6, the driving rod 72 should be rotated in the counterclockwise direcoion, i.e., the driving rod 72 should be rotated forward. Since the driving component 724 is located at each end of the driving rod 72, the two driving components 724 rotate around the positioning column 26 at the same time. The pin 28 drives the locking member 22 to slide along the third accommodation 262 by the inclined surface 7242, such that the locking portion 222 is departed from the first accommodation 142 and just accommodated in the second accommodation. Meantime, the handle 20 and the front leg 10 of the lateral frame 100 are unlocked with each other. When the driving rod 72 is lifted up, the front leg 10 and the handle rotates relative to each other by gravity. The first four-bar linkage mechanismBl drives the lower end of the front leg 10 to rotate around the first pivoting point Al toward the bottom member 40, such that the front wheel assembly 122 approaches the bottom member 40 to be folded. Meantime, since the supporting component 30 is driven by the handle 20, the second four-bar linkage mechanism B2 is driven to move by the supporting component 30, such that the rear leg 60 rotate around the upper connecting portion 642 toward the bottom member 40 to fold the rear wheel assembly 62. The stroller frame 1 with the folded front wheel assembly 122 and the folded rear wheel assembly 62 gets more compact. By the first four-bar linkage mechanism B1 and the second four-bar linkage mechanism B2, the front wheel assembly 122 and the rear assembly 62 can be folded at the same time when the stroller frame 1 is folded, as shown in FIG. 6 and FIG. 7. When it is desired to unfold the folded stroller frame 1, it is required to reverse the above-mentioned process. Therefore, the unfolding process is not reiterated.

In contrast to the prior art, the present invention provides the stroller frame with simple structure and easy operation by utilizing the first four-bar linking mechanism and the second four-bar linking mechanism linked with each other, such that the front wheel assembly and the rear wheel assembly of the stroller frame can be folded simultaneously when the stroller frame is folded, which reduces a space occupied by the stroller and allows users to transport or store the stroller frame easily.

fe sklllc J In the ait c'iLll readilv observe that numerous noCliflca:lons and alteratIons of the ijevice and method may be in s.de wb I.i.e et:. S I Ft t n a tt a te act-t.1. rigs a I lb a in van t It 05

Claims

Cl a ins v':ftaLis c].airri.e.d is 1. A stroller frame comprising: two lateral frames, each lateral frame comprising: a front leg, a lower end of the front leg being connected to a front wheel assembly; a bottom member, a front end of the bottom member being pivoted to the front leg at a first pivoting point; a handle, an upper end of the front leg being pivoted to a lower end of the handle at a second pivoting point; a supporting component, an upper end of the supporting component being pivoted to the handle at a third pivoting point, and the supporting component being pivoted to the bottom member at a fourth pivoting point near a lower end of the supporting component; a linking assembly, the lower end of the supporting component being pivoted to an upper end of the linking assembly at a fifth pivoting point; and a rear leg, a lower end of the rear leg being connected to a rear wheel assembly, an lower end of the linking assembly being pivoted to the rear leg at a sixth pivoting point, and the rear leg being pivoted to a rear end of the bottom member at a seventh pivoting point; and at least one connecting rod connected between the two lateral frames; wherein when the stroller frame is folded or unfolded, the front wheel assembly and the rear wheel assembly are folded at the same time.
2. The stroller frame of claim 1, wherein the linking assembly comprises a spring, a first connecting component, and a second connecting component, the first connecting component being movably connected to the second connecting component, an upper end of the first connecting component being pivoted to the supporting component at the fifth pivoting point, an lower end of the second connecting component being pivoted to the rear leg at the sixth pivoting point, and two ends of the spring being connected to the first connecting component and the second connecting component, respectively.
3. The stroller frame of claim 2, wherein the second connecting component is sleeved on the first connecting component and slidable relative to the first connecting component.
4. The stroller frame of claim 1, wherein a bottom member connecting portion is protruded down from the rear end of the bottom member, and the rear leg comprises a connecting piece pivoted to the bottom member connecting portion at the seventh pivoting point.
5. The stroller frame of claim 1, wherein the handle is pivoted to the front leg by a handle joint located at the lower end of the handle and a front leg joint located at the upper end of the front leg, and a locking member is disposed between the handle joint and the front leg joint for locking the stroller frame in a unfolding status.
6. The stroller frame of claim 5, wherein the connecting rod comprises a driving component for driving the locking member to unlock the stroller frame, so as to fold the stroller frame.
7. The stroller frame of claim 5 or 6, wherein the handle joint and the front leg joint are pivotally conneoted by a shaft, and the locking menber is mcvable alcng the shaft.
8. The stroller frame of claim 6, wherein the locking member comprises a locking portion, a first accommodation is formed on the front leg joint, a second accommodation is formed on a location of the handle joint opposice to the first accommodation, and the locking portion is slidably accommodated in a space between the first accommodation and the second accommodation.
9. The stroller frame of claim 8, wherein the locking member further comprises a driving portion protruded from a side of the locking portion away from the first accommodation, and the driving portion abuts against the driving component.
10. The stroller frame of claim 9, wherein the driving component comprises an inclined surface, and the driving portion comprises a pin for abutting against the inclined surface.
11. The stroller frame of claim 10, wherein a positioning column is disposed on the handle joint, and a third accommodation is formed on the positioning column for allowing the driving portion to slide.
12. The stroller frame of claim 11, wherein a through hole is formed on the driving portion, and the pin is passing through the through hole and protruded from the positioning column.
13. The stroller frame of claim 11, wherein the driving component is sleeved on the positioning column, and the inclined surface is extended at an oblique angle relative to the third accoimnodation.
14. The stroller frame of claim 6, wherein the driving component is rotatable around the locking member for driving the locking member to move along a direction perpendicular to a rotating direction of the driving component, so as to lock or unlock the stroller frame.
15. The stroller frame of the claim 1, wherein the stroller frame comprises a plurality of connecting rods, the two bottom members of the two lateral frames and one of the plurality of connecting rods are integrated in a U shape, and the two rear legs of the two lateral frames and another one of the plurality of connecting rods are integrated in a U shape.
16. The stroller frame of claim 1, wherein the front wheel assembly and the rear wheel assembly are folded toward the bottom member when the handle pivots relative to the front leg for folding the stroller frame.
17. The stroller frame of claim 1 or 16, the first pivoting point, the second pivoting point, the third pivoting point, and the fourth pivoting point form four jointing points of a first four-bar linkage mechanism, the fourth pivoting point, the fifth pivoting point, the sixth pivoting point, and the seventh pivoting point form four jointing points of a second four-bar linkage mechanism, and the first four-bar linkage mechanism is linked with the second four-bar linkage mechanism for folding or unfolding the front wheel assembly and the rear wheel assembly when the stroller frame is folded or unfolded.