Children's stroller with foldable front armrest

Abstract

The present invention discloses a foldable child stroller with a front armrest, comprising a push rod, a front foot rod and a rear foot rod connected by a rotating joint, characterized in that the rotating joint comprises a first rotating element coaxially arranged and fixedly connected to the push rod, a second rotating element fixedly connected to the front foot rod, and a third rotating element serving as a front armrest mounting seat; a linkage mechanism is provided between the first rotating element and the third rotating element, and between the second rotating element and the third rotating element, and the linkage mechanism comprises an arc groove with a rotating axis as a circle center and a linkage pin slidably extending into the arc groove and respectively arranged on the two rotating elements. The present invention uses two linkage pins to lock the third element in the unfolded state of the frame, and during the folding process, the third element is driven to rotate by the first rotating element, so that the front armrest is driven to fold together during the folding process of the frame without removing the front armrest in advance, thereby improving the folding efficiency of the stroller.

Description

Technical Field

[0001] The present invention relates to a baby stroller, in particular to a baby stroller with a front armrest that can be folded in a linked manner. Background Art

[0002] Existing child strollers generally include two symmetrically arranged side supports, each of which includes a push rod, a front leg rod and a rear leg rod. Two of the push rod, the front leg rod and the rear leg rod are rotatably connected, and one of them is rotatably connected to a third party. After unlocking, the two of them move closer to the third party, thereby folding and reducing the size of the frame.

[0003] For example, CN206265118U discloses a foldable stroller comprising a front leg, a rear leg, and a handlebar. The bottom of the handlebar, the top of the front leg, and the top of the rear leg are rotatably coupled to each other via a hinge mechanism. The stroller further comprises: a transmission rod hinged to the front leg; a first connecting rod linked to the handlebar and hinged to the transmission rod, configured to pull the transmission rod to flip when the handlebar rotates forward toward the front leg; and a second connecting rod hinged between the transmission rod and the rear leg, configured to pull the rear leg to rotate forward toward the front leg when the transmission rod flips. However, the front armrest of the stroller disclosed in this patent cannot be folded in conjunction with the frame, which affects folding efficiency. Summary of the Invention

[0004] The present invention provides a children's stroller with a linked folding front armrest, which solves the problem of low folding efficiency of existing strollers.

[0005] A child stroller with a foldable front armrest, comprising a push rod, a front leg rod, and a rear leg rod connected by a rotating joint, wherein the rotating joint comprises a coaxially arranged first rotating element fixedly connected to the push rod, a second rotating element fixedly connected to the front leg rod, and a third rotating element serving as a mounting seat for the front armrest;

[0006] A linkage mechanism is provided between the first rotating element and the third rotating element, and between the second rotating element and the third rotating element, wherein the linkage mechanism comprises an arc groove with a rotation axis as a circle center and a linkage pin slidably extending into the arc groove, respectively provided on the two rotating elements;

[0007] When the frame is unfolded, the linkage pin is at the corresponding end of the arc groove, limiting the rotation of the third rotating element. When the push rod is folded toward the front leg rod, the first rotating element drives the third rotating element to rotate through the linkage mechanism.

[0008] The third rotating element is located inside the rotating joint.

[0009] The first rotating element is arranged between the second rotating element and the third rotating element. A decorative element fixedly connected to the push rod is provided on the outer side of the rotating joint. The second rotating element is clamped between the first rotating element and the decorative element.

[0010] Two arc grooves are arranged on the third rotating element, and two linking pins are arranged on the first rotating element and the second rotating element.

[0011] The first straight hole and the second straight hole of the axis, the rotating joint has a locking pin inserted into the first straight hole and the second straight hole to prevent the first rotating element and the second rotating element from rotating relative to each other, and the second rotating element is provided with a second arc hole with the rotating axis as the center of the circle connected to the second straight hole.

[0012] The child stroller includes a slider connected to a locking pin, a pull wire connected to the slider to pull the locking pin out of the second linear hole, and a first return spring abutting the slider to drive the locking pin to slide into the second linear hole. The slider is provided with a waist-shaped hole arranged radially and slidingly matched with the rotating shaft.

[0013] A decorative element fixedly connected to the push rod is provided on the outer side of the rotating joint, the second rotating element is clamped between the first rotating element and the decorative element, and the inner side of the decorative element is provided with a sliding groove for accommodating a slider and a first return spring.

[0014] Plugs are provided at both ends of the front armrest, a recessed area matched with the plug is provided on the inner side of the third rotating element, and a slot matched with the plug is provided on the edge of the recessed area.

[0015] A locking hole is provided on the plug, and a locking block matched with the locking hole and a second return spring abutting against the locking block are provided at the center of the recessed area.

[0016] The rear foot rod is hinged to the second rotating element, and a hinged seat rod and a connecting rod are provided between the front foot rod and the rear foot rod. The seat rod is rotationally connected to the front foot rod, and the connecting rod is rotationally connected to the rear foot rod.

[0017] The present invention uses two linkage pins to lock the third element when the frame is in the unfolded state. During the folding process, the third element is driven to rotate by the first rotating element, so that the front armrest is folded together during the folding process of the frame without having to remove the front armrest in advance, thereby improving the folding efficiency of the cart. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the baby stroller of the present invention.

[0019] Figure 2 This is a schematic side view of the baby stroller of the present invention in the unfolded state.

[0020] Figure 3 2 is a side structural schematic diagram of the baby stroller of the present invention in a first folding state.

[0021] Figure 4 FIG2 is a side structural diagram of the baby stroller of the present invention in a folded state. ...

[0022] Figure 5 The figure is a schematic diagram of the exploded structure of the rotating joint of the child stroller of the present invention.

[0023] Figure 6 for Figure 5 Schematic diagram of another angle of the revolute joint shown.

[0024] Figure 7 Schematic diagram of the structure of the first rotating element of the present invention.

[0025] Figure 8 Schematic diagram of the structure of the decorative element of the present invention.

[0026] Figure 9 Schematic diagram of the structure of the third rotating element of the present invention.

[0027] Figure 10 Schematic diagram of the front structure of the seat post of the present invention.

[0028] Figure 11 for Figure 10 Section AA of the seatpost shown.

[0029] Figure 12 Schematic diagram of the three-dimensional structure of the seat post of the present invention. DETAILED DESCRIPTION

[0030] like Figure 1 As shown, a child stroller includes two symmetrically arranged side supports, each side support includes a push rod 1, a front leg rod 2 and a rear leg rod 3 connected by a rotating joint 10, the tops of the two push rods 1 are connected by a U-shaped handlebar 100, and an unlocking device 101 is provided in the middle of the push rod. The unlocking device mainly includes an unlocking block and a pull wire. When unlocking, the unlocking block is squeezed, and the pull wire will pull the locking pin inside the rotating joint 10 out of the locking position, thereby achieving the purpose of unlocking. The unlocking device can adopt existing structures disclosed in patent documents such as CN204871148U, CN204488877U, CN206344864U, etc., which will not be repeated here. A sunshade rod 6 is also provided between the two push rods 1.

[0031] like Figure 1As shown, when the frame is unfolded, the front leg bars 2 and push rod 1 are aligned. When folded, the push rod 1 needs to be tilted 180° to rest parallel to the front leg bars 2. The bottoms of the two front leg bars 2 are slightly curved inward and connected by a footrest 200, below which are mounted two front wheels. The two rear leg bars 3 are arranged parallel to each other, each with a rear wheel mounted on its bottom. The two rear wheels share a common axle, on which a brake mechanism is installed.

[0032] like Figure 5 and 6 As shown, the rotary joint 10 includes a first rotating element 11, a second rotating element 12 and a third rotating element 13 that are coaxially connected. The main parts of the three rotating elements are all disc-shaped. The use of a disc structure can, on the one hand, allow the various rotating elements to fit closely together, reducing the volume of the rotary joint 10, and on the other hand, allow the rotary joint 10 to have a cylindrical shape. When the various rotating elements rotate relative to each other, their volume and shape remain unchanged.

[0033] The third pivot joint 13, used to securely mount the front armrest 5, is located inside the pivot joint 10, while the second pivot joint 12 is located outside. The first pivot element 11 is located between the second and third pivot elements 12, 13. While the positions of the three pivot elements are theoretically arbitrary, since the front armrest straddles both side brackets, if the third pivot element 13 were located elsewhere, the front armrest 5 would interfere with the push rod 1 and front leg rod 2 during folding, preventing them from fully aligning and maintaining a parallel position.

[0034] In order to hide the mechanical structure inside the joint and keep the second rotating element 12 stable during the rotation process, a decorative element 14 is provided on the outside of the rotating joint 1, and the second rotating element 12 is sandwiched between the first rotating element 11 and the decorative element 14. Figure 7 and 8 As shown, there is a locking pin 113 between the decorative element 14 and the first rotating element 11, which passes through the second rotating element 12. The first rotating element 11 and the second rotating element 12 respectively have a straight hole 112 and a straight hole 122 whose extension lines pass through the rotating axis. The second rotating element 12 is provided with an arc hole 123 connected with the straight hole 122. When the locking pin 113 is in the position of the straight hole, the first rotating element 11 and the second rotating element 12 are locked and cannot rotate relative to each other. When the locking pin 113 disengages from the straight hole 122 and slides into the arc hole 123, the first rotating element 11 and the second rotating element 12 are unlocked and can rotate relative to each other.

[0035] like Figure 8As shown, to guide the locking pin's movement and prevent it from getting stuck, the locking pin 113 is connected to a pull wire 144 via a slider 141. A slot 143 is provided on the inner side of the decorative element 14, which mates with the slider 141. Both the slot 143 and the slider 141 pass through the axis of rotation, and the slider 141 is provided with a waist-shaped hole 142 that slidably engages the connecting shaft. Furthermore, a return spring 145 is positioned within the slot 143, abutting against the slider 141. When the pull wire pulls the slider 141, the return spring 145 is compressed, causing the locking pin 113 to disengage from the linear hole 122 and enter the arc hole 123. When the locking pin 113 rotates to the point where the arc hole 123 meets the linear hole 122, the return spring 145's resilience automatically forces the locking pin 113 into the linear hole 122, achieving locking.

[0036] In another embodiment of the present invention, the decorative element 14 is fixedly connected to the front foot rod 2, the first rotating element 11 is clamped between the second rotating element and the decorative element, and the slide groove is set on the first rotating element, but this design makes the first rotating element thicker, increasing the volume of the rotating joint.

[0037] The above is only one embodiment for achieving locking of the first rotating element and the second rotating element. The rotary joint of the present invention may also adopt a locking method using a ratchet as disclosed in CN206664663U.

[0038] like Figure 7 and 8 As shown, the decorative element 14 and the first rotating element 11 are symmetrically arranged. When assembled, their tail portions form a connecting tube 110 connected to the push rod 1. Similarly, the tail portion of the second rotating element 12 comprises a connecting tube 120 connected to the front leg 2 and a protrusion 121 hingedly connected to the connecting tube 15, which is fixedly connected to the rear leg 3. In this embodiment, the connecting tubes 110, 120, and 15 utilize a two-piece structure, respectively clamping the column push rod 1, front leg 2, and rear leg 3 during assembly and securely connected with rivets, making assembly easy.

[0039] like Figure 7 As shown, the side of the third rotating element 13 facing the first rotating element 11 is provided with an arc groove 134 and an arc groove 135 with the rotation axis as the center. The second rotating element 12 and the first rotating element are respectively provided with a linkage pin 114 and a linkage pin 124 that slide with the arc groove 134 and the smooth groove 135. The corresponding first rotating element 11 is provided with an arc hole 111 that avoids the linkage pin 124. The arc groove and the linkage pin constitute the linkage mechanism between the two rotating elements. Figure 9 As shown, when the vehicle frame is in the unfolded state, the linkage pins 114 and 124 are located at the top ends of the arc grooves 134 and 135 , which can prevent the third rotating element 13 from rotating relative to other rotating components.

[0040] In this embodiment, the arrangement of the arcuate grooves and the interlocking pins on the two interlocking rotating elements is interchangeable. For example, the arcuate grooves 134 and 135 can be arranged on the first and second rotating elements, while the interlocking pins 114 and 124 can be arranged on the third rotating element. However, when the positions of the interlocking pins and the arcuate grooves are interchanged, the position at which the interlocking pins lock the third rotating element also changes.

[0041] like Figure 5 and 6 As shown, the front armrest 5 is provided with plugs 51 at both ends. A recess 54 is located in the middle of the end of the plug 51, with a locking hole 52 in the middle of the recess. The edge of the plug is provided with a folded edge 53. The inner side of the third rotating element 13 has a recessed area 131 that mates with the plug 51. After installation, the plug is flush with the surface of the third rotating element. The edge of the recessed area 131 has a slot that mates with the folded edge 53. The center of the recessed area 131 has a protrusion 132 that mates with the recess 54 on the plug 51. The protrusion 132 is provided with a locking block 161 that abuts against a return spring 162 and has rebound capability.

[0042] During installation, the plugs 51 at both ends of the front armrest 5 are inserted into the slots on the recessed area 131. The locking block 161 engages with the lock hole 52 to lock the front armrest. During removal, the locking block 161 is pressed, and the return spring 162 is compressed, causing the locking block 161 to exit the lock hole 52, allowing the plug 51 to be removed from the slot. To prevent the locking block 161 from being ejected by the return spring 162, a mounting hole that engages with the locking block 161 is provided on the protrusion 132. Support feet with barbs are provided on the back of the locking block 161. The two support feet are elastic and abut against the edges of the mounting hole, preventing the barbs from being ejected by the return spring 162.

[0043] like Figure 1 As shown, the stroller of this embodiment also includes a seat post 4, the front end of which is rotatably connected to the front leg post 2, and the rear end of which is rotatably connected to the rear leg post 3 via a connecting rod 7. The connecting rod 7 and the seat post 4 are substantially coplanar and are disposed between the rear leg post 3 and the seat post 4. The seat post 4 primarily serves as a seat to support a child seated thereon, and its front end is provided with an adjustable leg rest 41. The seat post 4 can also be used to support a sleeping box, depending on the needs. The connecting rod 7 is primarily provided to facilitate folding the rear leg post 3, so that the rear leg post 3 can be moved closer to the front leg post when the seat post 4 is flipped.

[0044] There are various ways to fold the rear leg 3 in a coordinated manner. For example, the stroller disclosed in CN206265119U uses three connecting rods to drive the rear leg 3 toward the front leg 2. In another embodiment, the rotary joint has four rotating elements, three of which are the same as above, and an additional rotating element is fixedly connected to the rear leg. The rotating element has a linear hole and an arc hole that cooperate with the locking pin. The locking and unlocking methods are the same, and after unlocking, the linkage rod can achieve synchronous folding.

[0045] like Figure 10 and 11 As shown, a cross bar 8 is provided between the two seat rods 4, and the cross bar 8 includes a hollow connecting tube 89. Locking rods 85 are provided at both ends of the connecting tube 89. A return spring 84 is provided between the two locking rods 85 to abut against them, and a locking hole 71 that cooperates with the locking rod 85 is provided on the corresponding connecting rod 7.

[0046] like Figure 11 As shown, the exterior of the connecting tube 89 is sheathed with two pairs of meshing axial sleeves 82 and circumferential sleeves 81. The axial sleeves 82 are capable of axial movement along the connecting tube 89, while the circumferential sleeves 81 are capable of circumferential rotation relative to the connecting tube 89. The axial sleeves 82 and circumferential sleeves 81 are coaxially arranged, with their opposing ends meshing with each other. The meshing toothed edges 811 and 821 are arranged at an angle. Each axial sleeve 82 is connected to a corresponding locking rod 85 via a pin, and the connecting tube 89 has an axially arranged waist-shaped hole 891 for the pin to pass through. A limit block 810 is provided on the outer surface of the circumferential slide 81. The two circumferential sleeves 81 are sheathed with the external grip tube 80 via the limit blocks 810. When unlocked, grasping the grip tube 80 and rotating it can drive the synchronous rotation of the two circumferential sleeves 81.

[0047] like Figure 12 As shown, a double-lock mechanism is also provided on one side of the grip tube 80. This double-lock mechanism includes an unlocking sleeve 86 connected to the grip tube 80. One end of the unlocking sleeve 86, facing away from the grip tube 80, abuts against a return spring 87. The other end is provided with a stop block 861 that extends into the circumferential sleeve 81. The inner surface of the circumferential sleeve 81 is provided with a corresponding stop groove 88 that engages with the stop block 861. The stop grooves 88 and stop blocks 861 are arranged circumferentially, and any number of them can be provided. A protective tube 83 is provided in the area of ​​the connecting tube 89 not surrounded by the grip tube 80. The protective tube 83 surrounds the return spring 87 and the unlocking sleeve 86. The unlocking sleeve 86 is provided with a shift block 862 that passes through the protective tube 83.

[0048] To unlock, the thumb pushes the shift block 862, compressing the return spring 87 and causing the stop block 861 to exit the stop groove 88, no longer restricting the rotation of the circumferential sleeve 81. At this point, the grip tube 80 is gripped and rotated with one hand, causing the grip tube 80 to rotate the two circumferential sleeves 81, which in turn push the axial sleeves 82 toward each other, and in turn, the locking rod 85 to move toward each other. The locking end of the locking rod 85 exits the locking hole 71, compressing the return spring 84, and unlocking is achieved.

[0049] like Figure 2-4 As shown, the working principle of the baby stroller of the present invention is as follows:

[0050] When performing the first folding step, press the unlocking block on the unlocking device 101, and the unlocking block pulls the pull wire 145, and the pull wire 145 will pull the slider 141 and the locking pin 113, and the locking pin 113 will withdraw from the straight hole 122 and enter the arc hole 123. The first rotating element 11 can rotate relative to the second rotating element 12. In the unfolded state, the handle tube 1 and the front leg rod 2 are on the same straight line. Because the connecting tube 110 and the connecting tube 120 are eccentrically arranged, the connecting line between the handle tube 1 and the front leg tube 2 does not pass through the rotation center. When they are folded 180°, the handle tube 1 and the front leg tube 2 can maintain a parallel and close state.

[0051] When the frame is unfolded, Figure 9 As shown, interlocking pin 114 and interlocking pin 124 are located at the top (i.e., opposite ends) of arcuate groove 134 and arcuate groove 135, respectively, restricting the rotation of third rotating element 13. As handlebar 1 rotates toward front foot bar 2, interlocking pin 114 moves along arcuate groove 134 until it reaches its bottom end, while third rotating element 3 remains stationary. As handlebar 1 continues to rotate, interlocking pin 114 drives third rotating element 13 along with it, while interlocking pin 124 slides along arcuate groove 135 until handlebar 1 folds 180°. Because the plugs at both ends of front armrest 5 are fixed to third rotating element 13, the front armrest 5 rotates along with it during the folding process of handlebar 1.

[0052] like Figure 3 As shown, after the handlebar tube 1 is folded 180°, it remains parallel to the front leg tube 2. Next, the second folding step is performed. Holding the grip tube 80 with one hand, the thumb pushes the shift block 862, causing the shift block 862 to move to the left. The return spring 87 is compressed, and the stop block 861 exits the stop groove. At this time, the grip tube 80 is rotated. Through the series of movements described above, the locking rod 85 exits the locking hole 71, lifting the crossbar 8 upward, and the seat rod 4 rotates around the hinge point with the connecting rod 7. Due to the action of gravity, the rear leg rod 3 rotates around the hinge point with the second rotating element 12 and approaches the front leg rod 2 until the two remain parallel.

[0053] like Figure 4As shown, in the folded state, the handlebar tube 1, the front leg tube 2 and the rear leg tube 3 remain parallel and close to each other, the thickness of the entire vehicle body is small, and it is easy to carry and transport.

Claims

1. A foldable baby stroller with a front armrest, comprising a push rod, a front foot rod and a rear foot rod connected by a rotating joint, characterized in that: The rotary joint comprises a first rotary element coaxially arranged and fixedly connected to the push rod, a second rotary element fixedly connected to the front foot rod, and a third rotary element as a front armrest mounting seat, wherein the third rotary element is located on the inner side of the rotary joint, the first rotary element is arranged between the second rotary element and the third rotary element, a decorative element fixedly connected to the push rod is arranged on the outer side of the rotary joint, and the second rotary element is sandwiched between the first rotary element and the decorative element; A linkage mechanism is provided between the first rotating element and the third rotating element, and between the second rotating element and the third rotating element, wherein the linkage mechanism comprises two arc grooves respectively provided on the third rotating element with the rotating axis as the circle center, and linkage pins provided on the first rotating element and the second rotating element and extending into the corresponding arc grooves and slidable; When the frame is unfolded, each linkage pin is at the top end of the corresponding arc groove, limiting the rotation of the third rotating element. When the push rod is folded toward the front foot rod, the linkage pin of the first rotating element abuts against the bottom end of the corresponding arc groove, and drives the third rotating element to rotate. The rear foot rod is hinged to the second rotating element, and a seat rod and a connecting rod are hinged between the front foot rod and the rear foot rod. The seat rod is rotatably connected to the front foot rod, and the connecting rod is rotatably connected to the rear foot rod. A cross bar is provided between the two seat rods, and a locking rod is movably provided in the cross bar, and a grip tube rotatably provided on the outer periphery of the cross bar and matched with the locking rod, the locking rod acts on the locking hole of the connecting rod to limit the rotation of the rear foot rod. After the push rod is folded, the grip tube is rotated to drive the locking rod to exit the locking hole, the grip tube is lifted and the rear foot rod is driven to rotate close to the front foot rod by gravity.

2. The baby stroller according to claim 1, characterized in that: The first rotating element and the second rotating element are respectively provided with a first straight hole and a second straight hole with an extension line passing through the rotating axis. The rotating joint has a locking pin inserted into the first straight hole and the second straight hole to prevent the first rotating element and the second rotating element from rotating relative to each other. The second rotating element is provided with a second arc hole with the rotating axis as the center and connected to the second straight hole.

3. The child stroller according to claim 2, characterized in that: It includes a slider connected to the locking pin, a pull wire connected to the slider to pull the locking pin out of the second linear hole, and a first return spring abutting the slider to drive the locking pin to slide into the second linear hole. The slider is provided with a waist-shaped hole arranged radially and slidingly matched with the rotating shaft.

4. The child stroller according to claim 3, characterized in that: The inner side surface of the decorative element is provided with a sliding groove for accommodating a sliding block and a first return spring.

5. The baby stroller according to claim 1, characterized in that: Plugs are arranged at both ends of the front armrest, a recessed area matched with the plug is arranged on the inner side surface of the third rotating element, and a groove matched with the plug is arranged on the edge of the recessed area.

6. The child stroller according to claim 5, characterized in that: A locking hole is arranged on the plug, and a locking block matched with the locking hole and a second return spring abutting against the locking block are arranged at the center of the recessed area.

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