CN112224268A - Frame folding mechanism and baby stroller - Google Patents

Abstract

The invention discloses a seed frame folding mechanism and a baby stroller, wherein the baby stroller comprises a pair of bottom tubes, a pair of front legs, a pair of handrails, a pair of connecting rod assemblies, a pair of front leg sliding sleeves, a sliding sleeve locking mechanism and a transverse connecting mechanism; the pair of front foot sliding sleeves are respectively sleeved on the pair of front feet and can slide along the front feet; the sliding sleeve locking mechanism is used for locking and unlocking the front-foot sliding sleeve; the transverse connecting mechanism comprises an upper cross pipe assembly and a lower cross pipe assembly; because the handlebar, the front foot and the bottom tube are mutually pivoted, the connecting rod assembly is respectively pivoted between the handlebar and the bottom tube, and meanwhile, the front foot is provided with the front foot sliding sleeve which can slide along the front foot, so that the folded frame has smaller volume and is convenient to carry and store; in addition, due to the arrangement of the front foot sliding sleeve, when the frame is unfolded, the fulcrum of the free end of the upper cross pipe assembly is positioned on the front foot, so that the center of gravity of the whole vehicle can be adjusted, and the stability of the frame is improved.

Description

Frame folding mechanism and baby stroller

Technical Field

The invention relates to the technical field of baby carriages, in particular to a carriage folding mechanism and a baby carriage provided with the same.

Background

The stroller is widely used in families with infants, and provides great convenience for outdoor activities of infants. Generally, the stroller has an unfolded state and a folded state, and when the stroller is not used, the stroller is folded for storage and carrying.

Most of the existing baby strollers can only be longitudinally folded but cannot be transversely folded, so that the folded baby strollers are still not small enough in size and inconvenient to carry and store. Some stroller with lateral folding function have lateral and longitudinal folding mechanism, so the user can fold the stroller only by operating both hands simultaneously, which is very inconvenient for the user carrying the infant.

In addition, the folding effect of a small number of baby carriages which can be transversely folded is not good enough, and the stability is not good after the baby carriages are supported, so that the support is not stable enough

Therefore, there is a need to provide a stroller with a smaller folding volume, which is convenient to fold and has good structural stability, so as to overcome the above-mentioned problems in the prior art.

Disclosure of Invention

The invention aims to provide a frame folding mechanism which is convenient to fold and good in structural stability.

Another object of the present invention is to provide a stroller with convenient folding and good structural stability.

In order to achieve the purpose, the invention discloses a frame folding mechanism, which comprises a pair of bottom tubes, a pair of front feet, a pair of handlebars, a pair of connecting rod assemblies, a pair of front foot sliding sleeves, a sliding sleeve locking mechanism and a transverse connecting mechanism; the pair of bottom pipes provides a chassis supporting structure for the frame; each front foot is correspondingly pivoted with a bottom tube; the pair of the vehicle hands are correspondingly pivoted on the front feet respectively; the pair of connecting rod assemblies are respectively pivoted to a driver at one end and a bottom tube at the other end; the pair of front foot sliding sleeves are respectively sleeved on the pair of front feet and can slide along the front feet; the sliding sleeve locking mechanism is used for locking and unlocking the front-foot sliding sleeve; the transverse connecting mechanism comprises an upper cross pipe assembly and a lower cross pipe assembly, two ends of the upper cross pipe assembly are respectively pivoted to the pair of connecting rod assemblies and the pair of front foot sliding sleeves, one end of the lower cross pipe assembly is pivoted to one end of the pair of bottom pipes, and the other end of the lower cross pipe assembly is slidably pivoted to the pair of bottom pipes.

Compared with the prior art, the frame folding mechanism has the advantages that the handlebar, the front foot and the bottom tube are mutually pivoted, the connecting rod assembly is respectively pivoted between the handlebar and the bottom tube, meanwhile, the front foot is provided with the front foot sliding sleeve capable of sliding along the front foot, the upper cross tube assembly capable of pivoting per se is further pivoted between the connecting rod assembly and the front foot sliding sleeve, and the lower cross tube assembly capable of pivoting per se is further pivoted between the bottom tubes; therefore, when the bicycle frame is folded, the front foot sliding sleeve can be unlocked, the free end of the upper cross tube assembly is released, the handlebars, the front feet and the bottom tube are pushed to pivot mutually to realize longitudinal folding of the bicycle frame, in the process, the free end of the upper cross tube assembly drives the front foot sliding sleeve to slide downwards, the free end of the lower cross tube assembly slides to the rear end of the bottom tube, and meanwhile, the upper cross tube assembly and the lower cross tube assembly respectively pivot automatically, so that the pair of bottom tubes, the pair of handlebars and the pair of front feet are respectively driven to be drawn close to each other in opposite directions to realize transverse folding of the bicycle frame, the folded bicycle frame has smaller volume, and is convenient to carry and store, and the folding operation is simple and convenient; in addition, due to the arrangement of the front foot sliding sleeve, when the frame is unfolded, the fulcrum of the free end of the upper cross pipe assembly is positioned on the front foot, so that the center of gravity of the whole vehicle can be adjusted, and the stability of the frame is improved.

Preferably, the frame folding mechanism further includes a pair of seat tubes, one of the seat tubes is pivotally connected to the front leg and the connecting rod assembly, and the upper end of the upper cross tube assembly is also pivotally connected to the pair of seat tubes.

Preferably, the frame folding mechanism further comprises a frame locking mechanism for locking and unlocking the connection state of the rider and the front leg.

Preferably, the frame locking mechanism includes an engaging member slidably disposed in the rider and a frame unlocking member disposed on the rider, one end of the engaging member is detachably engaged with the front leg, and the other end of the engaging member is connected to the frame unlocking member.

Preferably, the frame release member includes a retracting pull handle slidably fitted to the rider and a connecting member disposed in the rider and sliding synchronously with the retracting pull handle, and the connecting member is connected to the engaging member through a first traction member.

Preferably, the engaging member is provided with a sliding groove extending along the length direction of the engaging member, the rider is fixedly provided with a fixing shaft transversely penetrating through the sliding groove, an elastic member is arranged in the sliding groove, one end of the elastic member abuts against the fixing shaft, and the other end of the elastic member abuts against the bottom wall of the sliding groove.

Preferably, the frame locking mechanism further includes a first pivot member disposed at an upper end of the front leg and a second pivot member disposed at a lower end of the rider, the first pivot member is provided with a locking notch corresponding to the locking member, the locking member is detachably locked in the locking notch, and the second pivot member is pivotally connected to the first pivot member.

Preferably, the sliding sleeve locking mechanism comprises a clamping hole formed in the front foot sliding sleeve and a clamping block arranged in the front foot, wherein a clamping protrusion matched with the clamping hole is arranged on the clamping block, and the clamping protrusion and the clamping hole can be clamped in a separable mode.

Preferably, the sliding sleeve locking mechanism further comprises a supporting seat and a driving sleeve which are arranged in the front foot; a clamping groove for containing the clamping block is formed in the supporting seat, and the clamping block can slide in the clamping groove; the driving sleeve is sleeved on the supporting seat, and the clamping block is driven to slide in the clamping groove through the relative sliding of the driving sleeve and the supporting seat, so that the clamping protrusion enters or exits the clamping hole.

Preferably, the two opposite side walls of the supporting seat are provided with first alignment grooves communicated with the clamping grooves, the clamping block is provided with a clamping pin clamped in the first alignment groove, the two opposite side walls of the driving sleeve are provided with a pair of inclined grooves inclined up and down, the clamping pin is clamped in the inclined grooves after extending out of the first alignment groove, and when the driving sleeve slides up and down relative to the supporting seat, the clamping block is driven to slide along the first alignment groove through the matching of the inclined grooves and the clamping pin.

Preferably, the supporting seat is fixedly disposed, the driving sleeve is slidably disposed, the sliding sleeve locking mechanism further includes a retracting connecting rod disposed in the front leg, an upper end of the retracting connecting rod is connected to the driving sleeve, a lower end of the retracting connecting rod is connected to the seat tube through a linkage mechanism, and when the frame is folded, the linkage mechanism drives the retracting connecting rod to slide downwards to drive the driving sleeve to slide downwards.

Preferably, a second travel groove communicated with the inside of the front leg is formed in the front leg, the linkage mechanism comprises a linkage pin and a pushing piece, one end of the linkage pin is connected with the upper end of the folding connecting rod, and the other end of the linkage pin penetrates through the second travel groove and can slide up and down along the second travel groove; the pushing piece is mounted on the seat tube, a pressure rod which bends towards the linkage pin is arranged on the pushing piece, and when the pushing piece pivots along with the seat tube, the pressure rod pushes and presses the linkage pin downwards.

Preferably, the support seat is slidably disposed, the driving sleeve is fixedly disposed, and the sliding sleeve locking mechanism further includes a second traction member disposed in the front leg, one end of the second traction member is connected to the support seat, and the other end of the traction member is connected to the first traction member.

Preferably, a reset piece is further arranged between the supporting seat and the driving sleeve, one end of the reset piece is abutted to the supporting seat, the other end of the reset piece is abutted to the driving sleeve, and the reset piece is used for resetting the relative position of the supporting seat and the driving sleeve.

Preferably, the connecting rod assembly comprises an upper connecting rod and a lower connecting rod, the upper connecting rod bends downwards and extends out of the second pivoting member, one end of the lower connecting rod is pivoted with the bottom pipe, and the other end of the lower connecting rod is pivoted with the upper connecting rod.

Preferably, the connecting rod assembly further comprises an inclined connecting rod, one end of the inclined connecting rod is pivoted with the pivoting points of the lower connecting rod and the upper connecting rod, and the other end of the inclined connecting rod is pivoted with the pivoting points of the seat tube and the upper cross tube.

Preferably, the upper cross pipe assembly comprises a first cross pipe and a second cross pipe which are arranged in a cross manner and are pivoted with each other, the upper ends of the first cross pipe and the second cross pipe are respectively pivoted to the pair of connecting rod assemblies or the pair of seat pipes, and the lower ends of the first cross pipe and the second cross pipe are respectively pivoted to the pair of front foot sliding sleeves.

Preferably, the lower cross pipe assembly includes a third cross pipe and a fourth cross pipe which are arranged in a cross manner and are pivoted with each other, one end of each of the third cross pipe and the fourth cross pipe is pivoted with the pair of bottom pipes, and the other end of each of the third cross pipe and the fourth cross pipe is slidably connected with the pair of bottom pipes.

Preferably, the frame folding mechanism further comprises a handlebar connecting mechanism pivoted between the pair of handlebars, and the handlebar connecting mechanism is provided with a handlebar locking mechanism for locking and unlocking the handlebar connecting mechanism.

Preferably, the handlebar connecting mechanism includes a pair of handlebar connecting members and a pair of transverse connecting members, each of the pair of handlebar connecting members is connected to the upper ends of a corresponding pair of handlebars, one end of each of the pair of transverse connecting members is pivotally connected to the corresponding handlebar connecting member, and the other end of each of the pair of transverse connecting members is pivotally connected to the handlebar locking mechanism.

Preferably, the frame folding mechanism further comprises a pair of sliding rods, the upper ends of the sliding rods are pivoted to the front legs, and the lower ends of the sliding rods are slidably pivoted to the bottom tubes.

The invention also discloses a baby stroller, which comprises a front wheel, a rear wheel and the frame folding mechanism, wherein one end of the front foot and one end of the bottom tube are connected with the front wheel, and the other end of the bottom tube is connected with the rear wheel.

Drawings

Fig. 1 is a perspective view of a stroller according to an embodiment of the present invention.

Fig. 2 is a perspective view of the stroller of the present invention from another perspective.

Fig. 3 is a schematic perspective view of a stroller in a semi-collapsed state according to an embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Fig. 5 is a schematic perspective view of a stroller in a fully folded state according to an embodiment of the present invention.

Fig. 6 is a schematic perspective view of the stroller in a fully folded state according to the embodiment of the present invention.

Fig. 7 is an exploded view of the rider-rider linkage of fig. 1.

Fig. 8 is an exploded view of the handlebar lock mechanism of fig. 1.

Fig. 9 is a side sectional view of the stroller of fig. 1.

Fig. 10 is an enlarged schematic view of the structure at B in fig. 9.

Fig. 11 is a schematic view of the connection structure of the front leg and the engaging member of the stroller according to the embodiment of the invention.

Fig. 12 is an exploded view of the connection between the front legs and the handle of the stroller in accordance with the embodiment of the present invention.

Fig. 13 is a schematic perspective view of a folding link of the stroller according to an embodiment of the invention.

Fig. 14 is a schematic view of an installation structure of the driving sleeve and the supporting base of the stroller according to the embodiment of the invention.

Fig. 15 is a schematic perspective view of the support seat in fig. 14.

Detailed Description

In order to explain technical contents, structural features, implementation principles, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in combination with the embodiments.

As shown in fig. 1, 2 and 9, in an embodiment of the stroller 1 disclosed in the present invention, the stroller comprises a front wheel 10, a rear wheel 11 and a frame folding mechanism, wherein the frame folding mechanism comprises a pair of bottom tubes 12, a pair of front feet 13, a pair of handrails 14, a pair of connecting rod assemblies 15 and a pair of front foot sliding sleeves 130. The pair of bottom tubes 12 are oppositely arranged at a certain distance and are respectively positioned at two sides of the frame, one end of each bottom tube 12 is connected with a front wheel 10, the other end of each bottom tube 12 is connected with a rear wheel 11, and the pair of bottom tubes 12 provides a chassis supporting structure for the frame. The pair of front feet 13 are respectively arranged at two sides of the frame, the lower end of each front foot 13 and the front end of a corresponding bottom tube 12 are pivoted with a first pivot point P1, the upper end of each front foot 13 inclines towards the rear of the frame, a front foot sliding sleeve 130 capable of sliding up and down along the front foot 13 is sleeved on each front foot 13, a sliding sleeve locking mechanism 3 for locking and unlocking the front foot sliding sleeve 130 is arranged between the front foot sliding sleeve 130 and the front foot 13, when the frame is in an unfolded state, the sliding sleeve locking mechanism 3 locks the front foot sliding sleeve 130 at a fixed position on the front foot 13, when the frame is folded, the sliding sleeve locking mechanism 3 releases the fixed state of the front foot sliding sleeve 130, and at the same time, the front foot sliding sleeve 130 can slide freely on the front. Each rider 14 and the upper end of a corresponding front leg 13 are pivotally connected to the second pivot point P2. The pair of connecting rod assemblies 15 are respectively arranged at two sides of the frame, the lower end of each connecting rod assembly 15 and the bottom tube 12 at the corresponding side are pivoted at a third pivot point P3, and the upper end of each connecting rod assembly 15 and the front foot 13 at the corresponding side are pivoted at a fourth pivot point P4. The frame folding mechanism in this embodiment further includes a transverse connection mechanism including an upper cross pipe assembly 17 and a lower cross pipe assembly 18, the upper end of the upper cross pipe assembly 17 and the connecting rod assembly 15 on the corresponding side are pivotally connected to the fifth pivot point P5, and the lower end of the upper cross pipe assembly 17 and the front foot sliding sleeve 130 are pivotally connected to the sixth pivot point P6. One end of the lower cross pipe assembly 18 and one end of the bottom pipe 12 on the corresponding side are pivotally connected to the seventh pivot point P7, and the other end of the lower cross pipe assembly 18 is slidably pivotally connected to the bottom pipe 12.

As shown in fig. 3, the handle 14, the front leg 13 and the bottom tube 12 of the stroller 1 with the above structure are pivotally connected to each other, and when folded, the handle 14, the front leg 13 and the bottom tube 12 are pushed to pivot to fold the frame longitudinally. In the longitudinal folding process when the front foot sliding sleeve 130 is in the unlocked state, please refer to fig. 5 and 6, the free end of the upper cross tube assembly 17 can be pushed to slide downwards along the front foot 13, and the free end of the lower cross tube assembly 18 can be pushed to slide backwards along the bottom tube 12, so as to drive the pair of bottom tubes 12, the pair of handlebars 14, and the pair of front feet 13 to respectively draw together in opposite directions, thereby realizing the transverse folding of the frame, so that the folded frame has a smaller volume, is convenient to carry and store, and is simple and convenient to fold. In this embodiment, due to the front foot sliding sleeve 130, when the frame is unfolded, the fulcrum of the free end of the upper cross pipe assembly 17 is positioned on the front foot 13, which is helpful for adjusting the center of gravity of the whole vehicle and improving the stability of the frame.

Referring to fig. 1 and 2 again, in another embodiment of the stroller of the present invention, a pair of seat tubes 16 for supporting seat cloth is further provided, the middle portion of each seat tube 16 and the front leg 13 of the corresponding side are pivotally connected to the eighth pivot point P8, the rear end of each seat tube 16 and the connecting rod assembly 15 of the corresponding side are pivotally connected to the ninth pivot point P9, however, in this embodiment, the upper cross tube assembly 17 can also be pivotally connected to the seat tube 16 of the corresponding side, i.e. the fifth pivot point P5 and the ninth pivot point P9 are both located on the seat tube 16, and the fifth pivot point P5 and the ninth pivot point P9 can be overlapped or separated. In addition, a sliding rod 19 can be arranged between the bottom tube 12 and the front foot 13 on each side of the frame to enhance the structural stability, the upper end of the sliding rod 19 and the front foot 13 are pivoted at a tenth pivot point P10, the lower end of the sliding rod 19 and the bottom tube 12 are slidably pivoted at an eleventh pivot point P11, that is, the lower end of the sliding rod 19 can slide back and forth along the bottom tube 12. When the bicycle frame is folded longitudinally, the sliding rod 19 pivots along with the front foot 13 to realize folding, and when the bicycle frame is unfolded, the sliding rod 19 guides partial force applied to the front foot 13 to the middle part of the bottom tube 12, so that the stability of the bicycle frame is improved.

With reference to fig. 1 and fig. 2, the upper cross pipe assembly 17 includes a first cross pipe 170 and a second cross pipe 171 which are disposed crosswise and pivotally connected to each other through a twelfth pivot point P12, upper ends of the first cross pipe 170 and the second cross pipe 171 are pivotally connected to the pair of connecting rod assemblies 15 or the pair of seat pipes 16 through a fifth pivot point P5, respectively, and lower ends of the first cross pipe 170 and the second cross pipe 171 are pivotally connected to the pair of front foot sliding sleeves 130 through a sixth pivot point P6, respectively. In addition, the lower cross pipe assembly 18 includes a third cross pipe 180 and a fourth cross pipe 181 which are arranged to intersect with each other and pivotally connected to each other through a thirteenth pivot point P13, one ends of the third cross pipe 180 and the fourth cross pipe 181 are pivotally connected to the pair of bottom pipes 12 through a seventh pivot point P7, respectively, and the other ends of the third cross pipe 180 and the fourth cross pipe 181 are slidably connected to the pair of bottom pipes 12, respectively.

In another preferred embodiment of the stroller 1 of the present invention, the stroller further comprises a frame locking mechanism for locking and unlocking the connection between the handle 14 and the front leg 13, when the stroller frame is unfolded, the handle 14 and the front leg 13 are locked by the frame locking mechanism, when the stroller frame is folded, the handle 14 and the front leg 13 are unlocked by operating the frame locking mechanism, and then the handle 14 is pushed to fold the stroller frame. Specifically, as shown in fig. 9 and 11, the rider 14 is a hollow tubular structure, the frame locking mechanism includes an engaging member 20 slidably disposed in the rider 14, and a frame release member disposed on the rider 14, one end of the engaging member 20 is detachably engaged with the front leg 13, and the other end of the engaging member 20 is connected to the frame release member. When the frame is unfolded, the engaging piece 20 is engaged with the front leg 13 to limit the pivoting of the front leg 13, so that the front leg 13 and the rider 14 are fixed in the unfolded state, and when the frame is folded, the frame release piece is operated to pull the engaging piece 20 out of the front leg 13.

As shown in fig. 9, the frame release member includes a foldable pull handle 210 slidably sleeved on the handle 14 and a connecting member 211 disposed in the handle 14 and sliding synchronously with the foldable pull handle 210, in this embodiment, the connecting member 211 is a hook, and the connecting member 211 is connected to the engaging member 20 through a first pulling member 212 (e.g., a steel wire). The folding pull handle 210 is sleeved on the handle 14 and can slide up and down along the handle 14, when the frame needs to be folded, the folding pull handle 210 is pulled upwards, the folding pull handle 210 drives the connecting member 211 to move upwards together, the connecting member 211 drives the first traction member 212 to move upwards, so that the clamping member 20 is separated from the front leg 13, and the handle 14 and the front leg 13 enter a free pivoting state. In this embodiment, the folding handle 210 is provided to facilitate folding of the frame, and the frame is highly operable.

As shown in fig. 11, when the frame is unfolded, in order to facilitate the return of the engaging member 20 and to engage with the front leg 13, the engaging member 20 is further provided with a return mechanism, the return mechanism includes a slide groove 22 extending along the longitudinal direction of the engaging member 20, a fixed shaft 23 transversely passing through the slide groove 22 is fixedly provided on the rider 14, an elastic member 24 is provided in the slide groove 22, one end of the elastic member 24 abuts against the fixed shaft 23, and the other end of the elastic member 24 abuts against the bottom wall of the slide groove 22. When the folding handle 210 is pulled to fold the frame, the engaging member 20 moves upward, the elastic member 24 is compressed, and when the folding handle 210 is released, the traction force on the first traction member 212 disappears, and the engaging member 20 moves downward under the elastic restoring force of the elastic member 24, thereby completing the resetting of the engaging member 20.

As shown in fig. 12, in order to cooperate with the pivoting of the rider 14 and the front leg 13, the frame locking mechanism further includes a first pivoting member 250 disposed at the upper end of the front leg 13 and a second pivoting member 251 disposed at the lower end of the rider 14, the first pivoting member 250 is provided with a locking notch 2500 corresponding to the locking member 20, the locking member 20 is detachably locked in the locking notch 2500, the second pivoting member 251 is pivotally connected to the first pivoting member 250, in this embodiment, a clamping groove (not shown) for accommodating the first pivoting member 250 is formed in the second pivoting member 251, and when the frame is folded, the first pivoting member 250 rotates in the clamping groove of the second pivoting member 251. In addition, the second pivot 251 is further connected to the link assembly 15, that is, the second pivot 251 rotates to drive the link assembly 15 to rotate. When the frame is unfolded, the lower end of the engaging member 20 is engaged with the engaging notch 2500 of the first pivot member 250 to limit the free pivoting between the first pivot member 250 and the second pivot member 251, and when the frame is folded, the engaging member 20 moves upward and exits from the engaging notch 2500, so that the first pivot member 250 and the second pivot member 251 are in a free rotation state.

In another preferred embodiment of the stroller 1 of the present invention, as shown in fig. 9 and 10, the sliding sleeve locking mechanism 3 includes a locking hole 30 disposed on the front foot sliding sleeve 130 and a locking block 31 disposed in the front foot 13, the locking block 31 is provided with a locking protrusion 310 adapted to the locking hole 30, the locking protrusion 310 and the locking hole 30 are detachably engaged by moving the locking block 31 in the front foot 13, and the locking and unlocking between the front foot sliding sleeve 130 and the front foot 13 are realized by engaging the locking protrusion 310 and the locking hole 30. In this embodiment, the wall of the front foot 13 is provided with a through hole (not shown) corresponding to the locking protrusion 310 on the locking block 31, and the locking protrusion 310 enters and exits the locking hole 30 on the front foot sliding sleeve 130 through the through hole.

Specifically, referring to fig. 10, fig. 14 and fig. 15, a supporting seat 32 and a driving sleeve 33 are disposed in the front leg 13, a locking groove 320 for accommodating the locking block 31 is disposed in the supporting seat 32, the locking block 31 can slide in the locking groove 320, the locking groove 320 is communicated with the locking hole 30 on the front leg 13, and the locking block 31 slides in the locking groove 320 in a direction opposite to the locking hole 30. The driving sleeve 33 is sleeved on the supporting seat 32, and the driving sleeve 33 and the supporting seat 32 slide relatively to each other, so as to drive the fixture block 31 to slide in the fixture groove 320, and enable the fixture protrusion 310 to enter or exit the fixture hole 30. Preferably, two opposite side walls of the supporting seat 32 are provided with first alignment grooves 321 communicated with the locking groove 320, the locking block 31 is provided with a locking pin 311 locked in the first alignment groove 321, two opposite side walls of the driving sleeve 33 are provided with a pair of inclined grooves 330 inclined up and down, the locking pin 311 is locked in the inclined grooves 330 after extending out from the first alignment groove 321, and when the driving sleeve 33 slides up and down relative to the supporting seat 32, the locking block 31 is driven to slide along the first alignment groove 321 through the cooperation of the inclined grooves 330 and the locking pin 311. That is, when the driving sleeve 33 moves downward relative to the supporting seat 32, the inclined slot 330 applies a pushing force to the locking pin 311 in a direction opposite to the locking hole 30, and the pushing force pushes the locking block 31 to move and disengage from the locking hole 30, thereby realizing unlocking.

The invention discloses two specific embodiments for driving a driving sleeve.

In embodiment 1, as shown in fig. 9 and 15, the support base 32 is slidably disposed and the driving sleeve 33 is fixedly disposed. In this embodiment, a second traction member 37 is disposed in the front leg 13, one end of the second traction member 37 is connected to the supporting seat 32, the other end of the second traction member 37 is connected to the first traction member 212, and the first traction member 212 and the second traction member 37 may be formed by one steel wire or two steel wires. In this embodiment, the support seat 32 is slidable and the driving sleeve 33 is stationary. When the frame is folded, the folding pull handle 210 is pulled, the second traction member 37 is pulled simultaneously under the action of the traction force of the first traction member 212, the second traction member 37 pulls the support seat 32 to slide upwards, and then the driving sleeve 33 slides downwards relative to the support seat 32, so as to drive the fixture block 31 to exit from the fixture hole 30.

In embodiment 2, as shown in fig. 3-4 and fig. 9-15, the supporting seat 32 is fixedly disposed, and the driving sleeve 33 is slidably disposed, based on which, a retracting link 34 is disposed in the front leg 13, a lower end of the retracting link 34 is connected to the driving sleeve 33, an upper end of the retracting link 34 is connected to the seat tube 16 through a linking mechanism, when the frame is folded, the linking mechanism drives the retracting link 34 to slide downwards to drive the driving sleeve 33 to slide downwards. In this mode, the support 32 is stationary and the driving sleeve 33 slides along the support. When the frame is folded, the seat tube 16 pivots and drives the driving sleeve 33 to move downward through the linkage mechanism, so that the fixture block 31 exits the fixture hole 30, and the locking of the front foot sliding sleeve 130 is completed. Preferably, the front leg 13 is provided with a second moving groove 35 communicating with the inside of the front leg 13, the second moving groove 35 extends up and down along the front leg 13, the linking mechanism includes a linking pin 360 and a pushing member 361, one end of the linking pin 360 is connected with the upper end of the folding link 34, as shown in fig. 13, the linking pin 360 is connected with the folding link 34 through a connection point 360', the other end of the linking pin 360 is inserted into the second moving groove 35 and can slide up and down along the second moving groove 35, the pushing member 361 is mounted on the seat tube 16, the pushing member 361 is provided with a pressure lever 3610 bending towards the linking pin 360, when the pushing member 361 pivots along with the seat tube 16, the pressure lever 3610 pushes the linking pin 360 downwards (as shown in fig. 4), and the linking pin 360 drives the folding link 34 to move downwards, and the folding link 34 drives the driving sleeve 33 to move downwards. In this embodiment, when the frame is folded, the folding pull handle 210 is pulled, the engaging member 20 is driven by the first traction member 212 to disengage from the front leg 13, the rider 14 and the front leg 13 can pivot and fold relatively, when the rider 14 and the front leg 13 are folded relatively, the pushing member 361 fixed on the seat tube 16 pivots along with the seat tube 16, so that the pressing rod 3610 on the pushing member 361 pushes the linking pin 360 downwards, and further the folding connecting rod 34 moves downwards along the front leg 13, and the downward movement of the folding connecting rod 34 causes the inclined groove 330 on the driving sleeve 33 to push the clamping block 31 to disengage from the clamping with the front leg sliding sleeve 130, so as to release the front leg sliding sleeve 130, thereby folding the frame.

When the frame is unfolded, the front foot sliding sleeve 130 is preferably automatically reset to the locking state, therefore, a reset piece 38 is also arranged between the supporting seat 32 and the driving sleeve 33, as shown in fig. 15, one end of the reset piece 38 abuts against the support seat 32, the other end of the reset piece 38 abuts against the driving sleeve 33, the reset piece 38 is used for resetting the relative position of the support seat 32 and the driving sleeve 33, the return element 38 can be a torsion spring or a spring, and in this embodiment, a spring is selected, one end of the spring is abutted with the top wall of the latch block 31, the other end of the spring is abutted with the top wall of the driving sleeve 33, when the driving sleeve 33 moves downwards relative to the supporting seat 32, the spring is compressed, and when the force on the retracting connecting rod 34 or the second traction element 37 is removed, under the elastic restoring force of the spring, the driving sleeve 33 or the supporting seat 32 is reset, so that the latch 31 is reset into the latch hole 30, and the forefoot sliding sleeve 130 enters the locking state from the new state.

Referring to fig. 2 and 9, in another preferred embodiment of the stroller 1 of the present invention, the connecting rod assembly 15 includes an upper connecting rod 150 and a lower connecting rod 151, the upper connecting rod 150 is bent downward from the second pivot 251, and in this embodiment, the upper connecting rod 150 and the second pivot 251 are integrally formed, i.e., the upper connecting rod 150 is pivotally connected to the front leg 13 through the second pivot 251. The lower end of the lower link 151 is pivotally connected to the bottom pipe 12 through a third pivot point P3, and the upper end of the lower link 151 is pivotally connected to the upper link 150 through a fourteenth pivot point P14. Further, the link assembly 15 further includes a tilt link 152, one end of the tilt link 152 is pivotally connected to the lower link 151 and the fourteenth pivot point P14 of the pivot point of the upper link 150, and the other end of the tilt link 152 is pivotally connected to the seat tube 16 and the fifth pivot point P5 or the ninth pivot point P9 of the pivot point of the upper cross tube. In this embodiment, the diagonal link 152 further enhances the stability of the vehicle frame.

In addition, in order to better match the transverse folding between the two handlebars 14, as shown in fig. 1, the frame folding mechanism of the present invention further includes a handlebar connecting mechanism 4 pivotally connected between the pair of handlebars 14, the handlebar connecting mechanism 4 is provided with a handlebar locking mechanism 42 for locking and unlocking the handlebar connecting mechanism, after the handlebar connecting mechanism 4 is unlocked, the handlebar connecting mechanism 4 can pivot relative to the handlebars 14 to enable the two handlebars 14 to approach each other, so as to adapt to the transverse folding of the frame. Preferably, the rider connecting mechanism 4 includes a pair of rider links 40 connected to the upper ends of the pair of riders 14, respectively, and a pair of cross links 41, one ends of the pair of cross links 41 are pivotally connected to the fifteenth pivot point P15 with the corresponding rider links 40, respectively, and the other ends of the pair of cross links 41 are pivotally connected by a rider locking mechanism 42. In this embodiment, a pair of transverse connectors 41 can be used as handles to push the frame after being straightened.

Referring to fig. 7 and 8, the locking mechanism 42 includes a first rotating joint 420, a second rotating joint 421, a positioning member 422, a spring 423, and a release button 424. For convenience of description, the pair of lateral connection members 41 in the above-described embodiment includes the left connection member 411 and the right connection member 410, wherein, the first rotary joint 420 is arranged at one end of the left connecting piece 411 far away from the driver connecting piece 40, and two side surfaces of the first rotary joint 420 are respectively provided with a first containing groove 4200 and a mounting hole 4201, the second rotary joint 421 is arranged at one end of the right connecting member 410 away from the rider connecting member 40 and is provided with a second containing groove 4210, the first rotary joint 420 and the second rotary joint 421 are pivoted by a pivot shaft 425, the first receiving groove 4200 and the second receiving groove 4210 correspond to each other, the positioning element 422 is slidably disposed on the pivot shaft 425 and received in the first receiving groove 4200 and the second receiving groove 4210, the spring 423 abuts between the positioning element 422 and the second rotating joint 421, and the lock release button 424 is slidably connected to the first rotating joint 420 and received in the mounting hole 4201. When the positioning member 422 is engaged with the first rotating joint 420 and the second rotating joint 421, the locking mechanism 42 is locked, and when the unlocking button 424 is pressed to push the positioning member 422 to disengage from the first rotating joint 420, the locking mechanism 42 is unlocked, in which process the spring 423 is compressed, and when the unlocking button 424 is released, the spring 423 is deformed again to drive the positioning member 422 to reset.

As shown in fig. 8, a plurality of positioning teeth 4220 are convexly disposed along the circumferential direction of the positioning element 422, a plurality of positioning grooves (not numbered) corresponding to the positioning teeth 4220 are respectively disposed on the inner walls of the first accommodation groove 4200 and the second accommodation groove 4210, and when the positioning element 422 is in the locking position, the positioning teeth 4220 thereon are engaged with the positioning grooves on the inner walls of the first accommodation groove 4200 and the second accommodation groove 4210.

The collapsing and opening of the stroller 1 in the above embodiment will now be described with reference to fig. 1-15.

1. The folding in the longitudinal direction is performed by first pulling the folding handle 210 upward, pulling the engaging piece 20 out of the front leg 13 by the first pulling piece 212, and unlocking the locking between the rider 14 and the front leg 13. Then, the rider linkage 40 is pushed toward the front wheel 10 of the stroller 1, so that the rider 14 rotates downward around the second pivot point P2 and approaches the front leg 13, and simultaneously the front leg 13 rotates downward around the first pivot point P1 and approaches the bottom tube 12, thereby pivoting the upper end of the sliding rod 19 around the tenth pivot point P10 and pivoting the lower end of the sliding rod 19 relative to the bottom tube sliding sleeve 120, and simultaneously pushing the bottom tube sliding sleeve 120 to slide along the bottom tube 12, so that the sliding rod 19 approaches the bottom tube 12 gradually. During the downward pivoting process of the rider 14, the upper link 150 is driven to move, so that the upper link 150, the lower link 151 and the tilt link 152 pivot around the fourth pivot point P4, the third pivot point P3, the ninth pivot point P9 and the fourteenth pivot point P14, respectively, and the tilt link 152 further drives the seat tube 16 to pivot around the eighth pivot point P8 to approach the front leg 13. The stroller 1 is folded longitudinally by pivoting the handle 14, the front leg 13, the sliding rod 19, the bottom tube 12, the connecting rod assembly 15 and the seat tube 16, and after folding, the handle connecting mechanism 4 is close to the front wheel 10, and the handle 14, the front leg 13 and the bottom tube 12 are substantially parallel, as shown in fig. 5.

The locking mechanism 42 of the locking handle is released, and the handle connecting mechanism 4 is folded. The release button 424 is pressed to push the positioning member 422, when the positioning member 422 is disengaged from the positioning slot of the first rotary joint 420, the first rotary joint 420 and the second rotary joint 421 are pushed to pivot relatively, so that the left connecting member 411 and the right connecting member 410 move downward and approach each other, and simultaneously, the pair of handlebar connecting members 40 pivot relative to the handlebar 14 respectively to release the handlebar 14, so as to prepare for transverse folding of the frame below.

2. During the longitudinal folding process of the stroller 1, the folding link 34 is driven to move downward along with the movement of the folding pull handle 210 or the seat tube 16, so that the latch 31 in the front leg 13 is withdrawn from the latch hole 30 on the front leg sliding sleeve 130, so that the front leg sliding sleeve 130 and the front leg 13 are unlocked, and then the lower ends of the first cross tube 170 and the second cross tube 171 are pulled to drive the front leg sliding sleeve 130 to move downward and rotate around the sixth pivot point P6 while moving downward, so that the first cross tube 170 and the second cross tube 171 are further caused to pivot and approach each other around the thirteenth pivot point P13 therebetween, and meanwhile, the front ends of the two cross tubes are respectively pivoted around the fifth pivot point P5 to pull the two bottom tubes 12 and the two front legs 13 to approach each other. In the process of closing the two bottom tubes 12, the third cross tube 180 and the fourth cross tube 181 pivoted with the bottom tubes are driven to pivot around the seventh pivot point P7, the third cross tube 180 and the fourth cross tube 181 pivot around the twelfth pivot point P12 between the two, the rear ends of the third cross tube 180 and the fourth cross tube 181 rotate around the bottom tube sliding sleeve 120, the pair of lower connecting rods 151 are closed, and therefore the pair of front legs 13 and the pair of handrails 14 are pulled to be closed respectively, and the baby stroller 1 is folded transversely. The folded stroller 1 has a smaller volume and is convenient to carry and store, as shown in fig. 6.

3. When the frame is opened, the rider 14 is pulled to pivot upwards relative to the front foot 13, the rider 14 drives the front foot 13 to move upwards, the front foot 13 drives the sliding rod 19 to move and pivot along with the front foot 13, and the lower end of the rear sliding rod 19 pulls the bottom tube sliding sleeve 120 to slide along the bottom tube 12 towards the front wheel 10. In the above process, the bottom tube sliding sleeve 120 slides to push the third cross tube 180 and the fourth cross tube 181 to pivot and unfold each other, and further push the pair of bottom tubes 12 to move away from each other to open the stroller 1 laterally, and at the same time, drive the first cross tube 170 and the second cross tube 171 to pivot and unfold, and after the first cross tube 170 and the second cross tube 171 are unfolded, drive the front foot sliding sleeve 130 to slide to a locking position to return to the locking state with the front foot 13, and then open the handlebar connecting mechanism 4. When the driver connecting mechanism 4 is unlocked, the lock release button 424 is pressed, the driver locking mechanism 42 is released, the pair of transverse connecting members 41 and the pair of driver connecting members 40 are pulled upward to be approximately horizontal, then the lock release button 424 is released, the two transverse connecting members 41 are in a locking state, and the driver connecting mechanism 4 is opened and fixed (as shown in fig. 1).

In summary, the stroller 1 of the present invention pivotally connects the frame components such as the handle 14, the front leg 13, the bottom tube 12, the upper cross tube assembly 17 and the lower cross tube assembly 18 together, so as to facilitate the folding of the frame and reduce the space occupied by the folded frame to the minimum; meanwhile, in order to enhance the overall stability and strength of the frame, the upper cross pipe assembly 17 is slidably connected with the front leg 13 through the front leg sliding sleeve 130 sliding along the front leg 13, so that the overall stress of the frame is partially guided to the front wheel 10, and the overall stress of the frame is uniform and the frame is strong in stability.

The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.

Claims (22)

1. A frame folding mechanism is characterized by comprising:

a pair of bottom tubes providing a chassis support structure for the frame;

a pair of front legs, each front leg is correspondingly pivoted with one bottom tube;

a pair of handlebars which are correspondingly pivoted on the front feet respectively;

a pair of connecting rod assemblies, which are respectively pivoted to the front legs at one end and pivoted to the bottom tube at the other end;

a pair of front foot sliding sleeves which are respectively sleeved on the pair of front feet and can slide along the front feet;

a sliding sleeve locking mechanism for locking and unlocking the forefoot sliding sleeve;

and the transverse connecting mechanism comprises an upper cross pipe assembly and a lower cross pipe assembly, two ends of the upper cross pipe assembly are respectively pivoted to the pair of connecting rod assemblies and the pair of front foot sliding sleeves, one end of the lower cross pipe assembly is pivoted to one end of the pair of bottom pipes, and the other end of the lower cross pipe assembly is slidably pivoted to the pair of bottom pipes.

2. The frame folding mechanism of claim 1, further comprising a pair of seat tubes, one of said seat tubes pivotally connected to a front leg and a connecting rod assembly, respectively, and the upper end of said upper cross tube assembly pivotally connected to a pair of said seat tubes.

3. The frame folding mechanism of claim 2, further comprising a frame locking mechanism for locking and unlocking the connection between the rider and the front leg.

4. The frame folding mechanism according to claim 3, wherein the frame locking mechanism includes a latch slidably disposed in the rider and a frame release disposed on the rider, one end of the latch detachably engaging with the front leg, and the other end of the latch being connected to the frame release.

5. The frame folding mechanism of claim 4, wherein the frame release member includes a retracting pull slidably disposed on the handle and a connecting member disposed in the handle and sliding synchronously with the retracting pull, and the connecting member is connected to the engaging member via a first pulling member.

6. The frame folding mechanism according to claim 4, wherein the engaging member has a sliding slot extending along a length direction of the engaging member, the rider has a fixed shaft fixed thereon and transversely passing through the sliding slot, the sliding slot has an elastic member disposed therein, one end of the elastic member abuts against the fixed shaft, and the other end of the elastic member abuts against a bottom wall of the sliding slot.

7. The frame folding mechanism of claim 4, wherein the frame locking mechanism further comprises a first pivot member disposed at the upper end of the front leg and a second pivot member disposed at the lower end of the rider, the first pivot member is formed with a locking notch corresponding to the locking member, the locking member is detachably locked in the locking notch, and the second pivot member is pivotally connected to the first pivot member.

8. The frame folding mechanism according to claim 5, wherein the sliding sleeve locking mechanism includes a locking hole disposed on the front foot sliding sleeve and a locking block disposed in the front foot, the locking block is provided with a locking protrusion adapted to the locking hole, and the locking protrusion is detachably engaged with the locking hole.

9. The frame folding mechanism of claim 8, wherein said sliding sleeve locking mechanism further comprises a support and a driving sleeve disposed within said front leg; a clamping groove for containing the clamping block is formed in the supporting seat, and the clamping block can slide in the clamping groove; the driving sleeve is sleeved on the supporting seat, and the clamping block is driven to slide in the clamping groove through the relative sliding of the driving sleeve and the supporting seat, so that the clamping protrusion enters or exits the clamping hole.

10. The frame folding mechanism according to claim 9, wherein a first alignment groove is disposed on two opposite sidewalls of the supporting seat and communicates with the engaging groove, the locking member has a locking pin engaged with the first alignment groove, a pair of inclined grooves are disposed on two opposite sidewalls of the driving sleeve, the locking pin is engaged with the inclined grooves after protruding from the first alignment groove, and when the driving sleeve slides up and down relative to the supporting seat, the locking member is driven to slide along the first alignment groove by the engagement between the inclined grooves and the locking pin.

11. The frame folding mechanism of claim 10, wherein the supporting seat is fixedly disposed, the driving sleeve is slidably disposed, the sliding sleeve locking mechanism further includes a retracting link disposed in the front leg, an upper end of the retracting link is connected to the driving sleeve, a lower end of the retracting link is connected to the seat tube through a link mechanism, and when the frame is folded, the link mechanism drives the retracting link to slide downward to drive the driving sleeve to slide downward.

12. The frame folding mechanism according to claim 11, wherein the front leg has a second traveling groove communicating with the inside of the front leg, the linking mechanism includes a linking pin and a pushing member, one end of the linking pin is connected to the upper end of the folding link, and the other end of the linking pin is inserted into the second traveling groove and can slide up and down along the second traveling groove; the pushing piece is mounted on the seat tube, a pressure rod which bends towards the linkage pin is arranged on the pushing piece, and when the pushing piece pivots along with the seat tube, the pressure rod pushes and presses the linkage pin downwards.

13. The frame folding mechanism of claim 10, wherein the supporting seat is slidably disposed, the driving sleeve is fixedly disposed, and the sliding sleeve locking mechanism further includes a second pulling member disposed in the front leg, one end of the second pulling member is connected to the supporting seat, and the other end of the pulling member is connected to the first pulling member.

14. The frame folding mechanism of claim 10, wherein a reset member is further disposed between the supporting seat and the driving sleeve, one end of the reset member abuts against the supporting seat, the other end of the reset member abuts against the driving sleeve, and the reset member is used to reset the relative position between the supporting seat and the driving sleeve.

15. The frame folding mechanism of claim 7, wherein the link assembly includes an upper link and a lower link, the upper link extends from the second pivot member and is bent downward, one end of the lower link is pivotally connected to the bottom tube, and the other end of the lower link is pivotally connected to the upper link.

16. The frame folding mechanism of claim 15, wherein the link assembly further includes a diagonal link, one end of the diagonal link is pivotally connected to the pivot points of the lower link and the upper link, and the other end of the diagonal link is pivotally connected to the pivot points of the seat tube and the upper cross tube.

17. The frame folding mechanism according to claim 1, wherein the upper cross tube assembly includes a first cross tube and a second cross tube that are disposed in a crossing manner and pivotally connected to each other, upper ends of the first cross tube and the second cross tube are pivotally connected to the pair of link assemblies or the pair of seat tubes, respectively, and lower ends of the first cross tube and the second cross tube are pivotally connected to the pair of front foot sliding sleeves, respectively.

18. The frame folding mechanism of claim 1, wherein the lower cross tube assembly includes a third cross tube and a fourth cross tube disposed in a cross manner and pivotally connected to each other, one end of the third cross tube and one end of the fourth cross tube are pivotally connected to the pair of bottom tubes, and the other end of the third cross tube and the other end of the fourth cross tube are slidably connected to the pair of bottom tubes.

19. The frame folding mechanism of claim 1, further comprising a handlebar connecting mechanism pivotally connected between a pair of the handlebars, wherein the handlebar connecting mechanism is provided with a handlebar locking mechanism for locking and unlocking the handlebar connecting mechanism.

20. The frame folding mechanism of claim 19, wherein said handlebar attachment mechanism includes a pair of handlebar attachment members and a pair of lateral attachment members, each of which is pivotally connected to an upper end of a corresponding one of said pair of handlebars, one end of each of said pair of lateral attachment members being pivotally connected to a corresponding one of said handlebar attachment members, and the other end of each of said pair of lateral attachment members being pivotally connected to said handlebar locking mechanism.

21. The frame folding mechanism of claim 1, further comprising a pair of slide bars, an upper end of the slide bars being pivotally connected to the front leg and a lower end of the slide bars being slidably connected to the bottom tube.

22. A stroller, comprising a front wheel, a rear wheel and a frame folding mechanism according to any of claims 1 to 21, wherein the front wheel and one end of the bottom tube are connected to the front wheel and the other end of the bottom tube is connected to the rear wheel.

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