JP5769586B2 - Folding stroller opening and closing device and stroller provided with this opening and closing device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding stroller opening and closing device and a stroller equipped with the opening and closing device, and more particularly, to open and close a folding stroller that can easily apply a force for posture change by easily operating a lock function of a body frame. The present invention relates to a device and a stroller provided with the opening / closing device.

  For example, as a stroller used when going out for shopping or taking a walk with an infant, a so-called foldable stroller capable of reducing the size in the front-rear direction and the width direction is provided.

Such a foldable baby stroller is provided with an opening / closing device for changing the posture from the folded state to the used state or from the used state to the folded state.
Various opening / closing devices have been proposed. In any case, the structure is such that the operator's force is transmitted to the entire body frame constituting the stroller, so that the opening / closing device is opened or contracted (for example, Patent Document 1). reference.).

  In the present specification (including claims), expressions indicating directions such as “front”, “rear”, “left”, “right”, “back” and “front” are based on the operator pushing the stroller. The traveling direction is “front”, and the back side of the operator is “rear” or “rear”. “Left” and “Right” refer to the same direction as the operator's hand unless otherwise specified. Furthermore, the “upper” and “lower” of the stroller means the direction of the top and bottom with the front and rear wheels grounded. Is shown.

  That is, in the stroller of Patent Document 1, as shown in FIGS. 5 to 8 of Patent Document 1, as a main component of the vehicle body frame, a pair of rear leg frames 4 and 4 are crossed on the back side. And an X-shaped frame 8 made up of bar members 81 and 82, and the X-shaped frame 8 is passed to the rear leg frames 4 and 4. The X-shaped frame 8 is installed such that its upper end is slidable in the vertical direction with respect to the pair of rear leg frames 4, 4 via slide members 7, 7 mounted on the upper side.

  In the stroller provided with the vehicle body frame having such a configuration, if the posture of the X-type frame 8 is expanded in the width direction as shown in FIG. ). On the other hand, as shown in FIG. 6 of Patent Document 1, if the X-type frame 8 is pulled toward the center, the folded position, that is, the posture during transportation is set. In these drawings, the length in the width direction of the pair of rear leg frames 4 and 4 is shown to be expanded and contracted. The length is also expanded and contracted in the direction perpendicular to the direction.

  In such a foldable baby stroller, a conventional opening / closing device is disposed so as to straddle between one rod member 81 and the other rod member 82 of the X-shaped frame 8, and the folding / strolling device can be folded or expanded from the opening / closing device. Power to do is added.

  For example, in this stroller opening and closing device, as shown in FIG. 8 of Patent Document 1, the slide members 7 and 7 are moved upward by holding the annular grip 33 with one hand and pulling the grip 33 upward as it is. Thus, the width of the pair of rear leg frames 4 and 4 is set to be reduced.

  In this stroller, it is folded or expanded in this way, but in addition to this, in order to prevent the folded body frame from unintentionally expanding, A locking mechanism is provided on the side.

  A lock mechanism 40 provided in the stroller includes a belt-like hook 42 whose base end side is rotatably supported, a pin 41 on which the hook 42 is detachably locked, and the like.

  Then, in order to change the body frame from the folded position to the posture at the time of use, as shown in FIG. 8 of Patent Document 1, the grip portion 33 is moved upward unless the lock mechanism 40 is unlocked. It has a structure that cannot be pulled up.

JP 2010-253976 A

  By the way, in the conventional opening / closing apparatus provided with such a lock mechanism 40, it is assumed that a baby stroller operator such as a mother applies force by operating the grip portion 33 with the right hand. Therefore, when it is going to pull up the grip part 33 with a different mode, that is, with the left hand, the thumb of the left hand is positioned on the side opposite to the hook 42 of the lock mechanism 40. Therefore, it becomes difficult to operate the lock mechanism 40 with one left hand. In such a case, both hands will be used. Therefore, there is a problem that the usability is bad.

  In addition, in the conventional switchgear provided with such a lock mechanism 40, when changing from the position in use to the folded position, it can be handled by grasping the grip portion 33 of the switchgear, but it is folded in reverse. It was necessary to get used to the operation in order to change the posture to the posture at the time of use. That is, the opening operation and the folding operation are not concentrated in the same place. This is inconvenient for the user and there is room for improvement.

  In view of such circumstances, an object of the present invention is to provide a folding stroller opening / closing device that has good operability and can be easily operated by any user, and a stroller including the opening / closing device.

The folding stroller opening and closing device according to the present invention is a folding stroller opening and closing device that is folded in the width direction and the front-rear direction in a state in which the body frame with a lock function is released from the lock function. A pair of rear leg frames located on the side are mounted on a pair of rear leg frames so as to cover the pivot portion between the other ends of the pair of link members, one end of which is rotatably supported,
A main body trunk portion formed with a guide passage for guiding the bending operation of the pair of link members;
A flat plate head formed integrally with the main body body and arranged in a substantially horizontal posture;
The main body torso and the flat plate head are formed so as to be connected to each other, and have a grip portion with a long hole into which the thumb can be inserted and the remaining four fingers can be inserted from the side.
An operation button for the lock function is arranged at an upper end portion of the grip portion.

  According to the opening and closing device with such a configuration, even if the hand of either the right hand or the left hand grasps the grip portion, the operation button is located near the thumb, so that anyone can easily perform operations such as unlocking. Can lead to.

  Here, in the present invention, one end portion of the X-shaped frame disposed in a manner in which the two bar members intersect is rotatably supported at one end portion of the pair of link members. In addition, it is preferable that the other end of the X-type frame is supported by the pair of rear leg frames so as to be rotatable and immovable.

Moreover, the stroller according to the present invention includes any one of the opening / closing devices.
With such a configuration, by pushing down the flat plate head positioned in a substantially horizontal state with a palm, the X-shaped frame can be slid downward to expand the pair of rear leg frames. On the other hand, if the grip portion is gripped and lifted, the X-type frame can be folded from the expanded position.

  According to the folding stroller opening and closing device according to the present invention, since the grip portion for performing the opening and closing operation has no directionality, the lock function can be easily released and folded or expanded regardless of which hand is used for the operation. You can do it.

  Moreover, in this invention, it is easy to apply force to the flat-plate head for applying force. In addition, the position of the flat plate head can be easily confirmed because it is in a position that is easily noticeable from the outside. Therefore, there is an advantage that it is easy to use for everyone.

FIG. 1 is a perspective view of a stroller provided with an opening / closing device according to an embodiment of the present invention, as viewed from the front wheel side. FIG. 2 is a perspective view of the stroller of FIG. 1 viewed from the rear wheel side. FIG. 3 is a perspective view showing a folded posture of the stroller shown in FIG. FIG. 4 is an enlarged perspective view of the stroller opening and closing device shown in FIG. FIG. 5 is a partially broken perspective view showing the inside of the switchgear shown in FIG. 6 is an enlarged perspective view showing another embodiment of the switchgear shown in FIG. FIG. 7 is a schematic perspective view of an extension seat that is detachably attached to a stroller according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a posture (expanded posture) when the folding baby stroller according to one embodiment of the present invention is used, and FIG. 2 is a perspective view when the baby stroller shown in FIG. 1 is viewed from the back side. It is. FIG. 3 is a perspective view showing a state in which the stroller is folded, that is, a non-use posture (folding posture).

  As shown in FIGS. 1 to 3, the stroller 10 according to the present embodiment is a foldable baby stroller that can expand the body frame in the width direction and the front-rear direction, or can be folded compactly. is there.

  As clearly shown in FIG. 2, the left handle 12a and the right handle 12b are arranged at positions where the pair of front leg frames 16, 16 and the pair of rear leg frames 15, 15 intersect at an acute angle upward. Since these handles are separate types, there is no horizontal bar between the left and right handles 12a, 12b. Thereby, the upper part of the flat-plate head 34 of the switchgear A mentioned later can be open | released. In other words, there is no member that obstructs the operation above the opening / closing device A when the stroller is folded from the folded position. Therefore, in this embodiment, the flat plate head 34 of the opening / closing device A can be easily pushed.

  Further, in the state of FIG. 2, the rear wheels 13a and 13b are arranged closer to the front wheel side than directly below the left and right handles 12a and 12b in the vertical direction. Thereby, when the operator walks while pushing the stroller, the operator's toes are set so as not to be caught on the rear wheels 13a and 13b of the stroller.

  In such a foldable baby stroller 10, the mutual posture change of folding or expanding can be performed with one hand from the opening / closing device A disposed on the top of the X-shaped frame 20 as shown in FIG. 2.

Hereinafter, the opening / closing device A of this embodiment will be described, but prior to that, an outline of the body frame provided in the stroller of this embodiment will be described.
That is, the pair of front leg frames 16 and 16 and the pair of rear leg frames 15 and 15 in the present embodiment are both substantially linear and are arranged so as to form an inverted V shape between each other. The front leg frames 16 and 16 are set longer than the rear leg frames 15 and 15. Bendable link portions 17a and 17b are interposed in the vicinity of the connecting portion with the rear leg frames 15 and 15 so that the front leg frames 16 and 16 are shorter than the rear leg frames 15 and 15 when folded.

  In the present embodiment, the frames 15 and 16 are formed in a straight line, but the frames 15 and 16 are not limited to a straight line. These frames may be curved as long as they can maintain sufficient rigidity.

Here, the reason why the flexible link portions 17a and 17b are interposed in the V-shaped connecting portion is as follows.
That is, since the front leg frames 16 and 16 are set longer than the rear leg frames 15 and 15 in a normal use state, the front wheels 14a and 14b are positioned below the rear wheels 13a and 13b when folded as they are. The rear wheels 13a and 13b will float from the ground contact surface. This is not stable when folded. In order to avoid this, flexible link portions 17a and 17b are provided above the front leg frames 16 and 16, and the link portions 17a and 17b are bent to absorb the extra length. .

  Further, in this embodiment, as shown in an enlarged view in FIG. 4, an X-shaped frame 20 made up of two bars 18, 18 is passed between the pair of rear leg frames 15, 15. As in the case of the X-type frame 8 of Patent Document 1, the X-type frame 20 is rotatable about the center portion as a fulcrum, and thus can expand and contract in the vertical direction and the width direction. Further, the upper end portion of the X-shaped frame 20 shown in FIG. 4 is slidably installed on the rear leg frames 15 and 15 via the slide members 21 and 21. That is, it is installed to be movable in the vertical direction. Further, the lower end portion of the X-type frame 20 is rotatably supported by the fixing members 23 and 23 so that the mounting angle can be adjusted with respect to the rear leg frames 15 and 15, and at the same time, On the other hand, it is installed so that it cannot move vertically.

  Further, in this embodiment, as shown in FIGS. 1 and 2, λ-type connecting bodies 27 and 27 formed in a λ shape from two rod members are installed on both side portions of the body frame. . There is a bottom frame that extends horizontally from the λ-type connecting body 27 and supports the load of the base.

  The λ-type connecting body 27 is a slide in which the fixing members 24, 24 positioned immediately below the fixing members 23, 23 fixing the lower end portion of the X-type frame 20 and the upper end portion of the X-type frame 20 are slidably supported. The members 21 and 21 and the fulcrums 28 and 28 which are support portions for the front leg frames 16 and 16 are supported at three locations, and are supported rotatably at these three points. Further, in the λ-type connecting body 27, an intermediate fulcrum 25a where two bar members intersect is rotatable. The λ-type connecting body 27 configured in this manner has a function of transmitting the vertical force applied to the X-type frame 20 so that the front leg frames 16 and 16 move in the horizontal direction.

  Further, in the vehicle body frame of the present embodiment, as shown in FIGS. 2, 4 and 5, a pair of links in the horizontal direction are connected so that the separated upper ends of the X-type frame 20 on the back side are connected to each other. Members 30 and 31 are interposed. The pair of link members 30 and 31 are rotatably supported with respect to the slide members 21 and 21.

  Further, the other end portion located on the center side of the link members 30 and 31 is rotatably connected to each other by a pin 51 in the body trunk portion 33 of the opening / closing device A as described in detail below. .

Hereinafter, the opening / closing device A will be described with reference to FIGS. 4 and 5 in particular.
Since the opening / closing device A of the present embodiment is configured as a hollow body, FIG.

  That is, the opening / closing device A includes a main body barrel portion 33 that is mounted so as to cover the pivot portion of the pair of link portions 30 and 31, and a flat plate that is integrally bulged on the upper portion of the main body barrel portion 33. The head 34 is composed of a grip part 35 into which one of the left and right hands is inserted, and an operation button 36 attached to the grip part 35.

  The pair of link members 30 and 31 are flat and are rotatably supported by the pin member 51 at the center of the main body trunk portion 33. Further, guide passages 38, 38 for guiding the bending operation of the link members 30, 31 are formed on the side surface of the main body body 33 in the vertical direction.

The flat plate head 34 is a so-called operation surface portion, and as shown in FIG. 4, a large area is secured so that the operator's palm can be pressed against the horizontal direction from above.
The grip portion 35 has an elongated hole 39 in the vertical direction so that the remaining four fingertips can be inserted with the thumb up.

Such an opening / closing device A is symmetrical.
The main body trunk portion 33 and the grip portion 35 are configured with a lock mechanism that allows or restricts the bending operation of the pair of link members 30 and 31 when a predetermined amount of force is applied and pushed in. The lock mechanism is applied with an operation force via a push button type operation button 36, and the detailed configuration is not particularly limited.

  However, it is preferable that the operation button 36 of the lock mechanism protrudes in a substantially horizontal direction so that it can be operated with the thumb. The operation button 36 according to the embodiment includes an urging means such as a coil spring. If the operation button 36 is pushed inward against the urging force of the urging means, the link members 30 and 31 are bent. Can be separated from the link members 30 and 31. That is, as shown in FIG. 5, a kanuki member 59 having a large lateral width is disposed at the connecting portion of the link members 30 and 31, and grooves 37 and 37 (only one is shown) of the link member 30 corresponding thereto are formed. Has been. In this way, when the kanuki member 59 having a large width fits into the grooves 37 and 37, the position where the kanuki member 59 and the link members 30 and 31 are caught approaches the rotation fulcrum of the link member. The breaking strength can be increased.

  By releasing this lock with the operation button 36, the link members 30, 31 can be bent freely. On the contrary, the force is released from the operation button 36, and the lock mechanism operates at the position where the cannula member 59 fits in the groove 37, that is, in the expanded position.

  Further, in this embodiment, as shown in FIG. 2, a belt-like hook 40 is provided which is detachably passed from the rear leg frame 15 to the projection of the λ-type connecting body 27. The hook 40 is made of resin, and the folding position of the stroller is maintained by the resin hook 40 being locked to the locking protrusion formed on the coupling body 27. That is, the folding posture is prevented from opening carelessly.

  The hook 40 is not limited to locking with the locking protrusion formed on the connecting body 27, and for example, a locking protrusion is provided on the front leg frame 16 to lock the hook 40 so as to hold the folded posture. You may do it.

  Further, in the present embodiment, as shown in FIG. 1, a front guard 61 having both ends curved in an arc shape is detachably passed between the front leg frames 16 and 16. The front guard 61 is preferably flexible to some extent so that the front guard 61 will not be folded even when the stroller is in a folded position. For that purpose, it is preferably formed from EVA (ethylene-vinyl acetate copolymer resin) or the like.

The folding baby stroller provided with the opening / closing device A according to the present embodiment is generally configured as described above, and the operation will be described below.
Now, as shown in FIG. 1 or FIG. 2, the stroller is in an expanded position, that is, in use.

  In order to fold the stroller from this state, the operator first starts by grasping the grip 35 of the opening / closing device A. At this time, since the elongate hole 39 in the vertical direction is formed in the grip part 35, the four fingers except for the thumb enter the elongate hole 39 even if the grip part 35 is gripped by either the left or right hand. Can be directed to. At that time, regardless of whether it is operated with the right hand or the left hand, the remaining thumb is in a posture facing upward in any case. Therefore, even if the left or right hand is used, the thumb is arranged in the vicinity of the operation button 36 shown in FIG. 4, so there is no problem for the operator to press the operation button 36.

  For example, when the grip portion 35 is grasped with the right hand, the thumb of the right hand is applied to the operation button 36 and the operation button 36 is pushed inward. By pushing the operation button 36 with the thumb of the right hand, the lock mechanism that has been functioning so far is released. As a result, the body frame composed of the X-type frame 20 and the like can be folded.

  As the next operation, the grip portion 35 is pulled up with the right hand while applying a force to press one of the handles 12a and 12b shown in FIG. 2 downward with the remaining left hand. Then, the force that pulls the grip 35 upward is transmitted to the left and right link members 30 and 31 at the same time, so that the slide members 21 and 21 slide upward and the X frame 20 moves. It will be folded.

  Thus, the stroller is folded in the width direction and folded. At this time, since the force is transmitted to the λ-shaped connecting body 27 in the front-rear direction of the stroller at the same time, the length is also shortened in the front-rear direction. In this way, the stroller can be reliably folded as shown in FIG.

  On the other hand, in order to spread the vehicle body frame from the folded posture of FIG. 3 to the posture of the use state of FIG. 1, an operation opposite to this may be performed. That is, the handle 12a, 12b is pressed with the left hand, for example, and the right hand is placed on the flat plate head 34 of the opening / closing device A. And this flat plate head 34 should just be pushed down by the whole palm. In this way, when the flat plate head 34 is pushed down with the palm, the force is transmitted to the pair of link members 30 and 31, and the connecting portion on the center side of the link members 30 and 31, which has been increased so far, is low. Finally, the link members 30 and 31 are linearly arranged as shown in FIG. Thus, by arranging the link members 30 and 31 in a straight line, the stroller assumes an expanded posture as in use. Thereafter, by repeating such operations, the expansion and folding can be changed.

Note that, as described above, the lock is not limited to operate in the folded posture, and a mechanism in which the lock operates in the folded posture may be used.
In addition, as described above, when the opening / closing device A is changed from the folded posture to the expanded posture, the operator is not limited to directly operating the ceiling portion of the flat plate head 34 as the operation surface portion with the palm. That is, as shown in FIG. 6, step 44 may be extended below the grip 35 and the operator may step down the step 44 with his / her foot. Thus, even if it is the case where it is the structure which steps down step 44, operation to the folding position of a stroller and operation to an expansion position can be performed with the opening-and-closing apparatus A, and each operation is easy. Can be recognized.

In the present embodiment, since the opening / closing device A is formed in a substantially left-right symmetric shape, even if it is operated with the right hand or the left hand, it can be operated in the same manner.
In the stroller equipped with such an opening / closing device A, when the direction of the stroller is changed, the front wheels 14a and 14b are located on the straight lines of the front leg frames 16 and 16, so the left and right handles 12a and 12b If the front wheels 14a and 14b are floated directly and lightly through the front leg frames 16 and 16, the direction can be changed with a light force.

  On the other hand, in the stroller of the present embodiment, the angle of the back plate 19 on which the infant is laid down can be adjusted. In other words, the back plate 19 is configured such that the upper half of the back plate 19 is tiltable from the buttocks position toward the shoulder. Further, as shown in FIG. 2, the load acting on the shoulder portion of the back plate 19 is supported by a belt 47 drawn around in the substantially horizontal direction on the back side.

  The belt 47 is fixed when the belt 47 is inserted into the reclining buckle 46 at the center, whereby the left and right belts 47a and 47b are tensioned when a load is applied.

Such a reclining buckle 46 can be easily pulled out of the band with one hand, and as a result, the angle of the back plate 19 can be adjusted with one hand.
In this way, the tilt angle of the back plate 19 can be adjusted by operating the reclining buckle 46 with one hand and adjusting the pull-out length of the belt. Similarly, the fixing of the belt 47 can be released with one hand and reclining. The posture (a horizontal posture in which the shoulder portion of the back plate 19 is approximately 180 degrees) can be adopted.

Thereby, when it is desired to place the infant in a substantially horizontal posture, the back plate 19 on which the infant sleeps can be set in the horizontal direction.
On the other hand, the stroller in FIG. 1 shows a so-called rear-type stroller in which the lines of sight of the infant and the operator are both directed in the traveling direction, but there is a demand for changing this to a face-to-face type. In that case, as shown in FIG. 7, another extension seat 50 is prepared separately, and if this extension seat 50 is detachably mounted on the existing back plate 19, the stroller can be face-to-face. Can be changed.

Hereinafter, the extension seat 50 shown in FIG. 7 will be described.
Similar to the back plate 19, the extension seat 50 is made of a material rich in cushioning properties. The extension seat 50 rises so that the peripheral edge 52 on the head side (the right side in FIG. 7) is substantially U-shaped and close to the head so as to cover the entire circumference of the body as well as the portion covering the head of the infant. Is formed. Then, the locking piece 53 provided on the lower surface of the extension seat 50 is fitted into the pipe frame at the bottom of the seat, and the hole of the locking piece 53 is engaged with the locking projection 55 shown in FIG. It can be attached to the stroller body. In addition, the code | symbol 57 in FIG. 7 shows the string body for fixing the extension seat 50 to the existing cushion side.

  Such an extension seat 50 is mounted in an opposite posture to the existing back plate 19 provided on the stroller body side. That is, the string 57 side of the extension seat 50 is disposed and attached to the handles 12a and 12b shown in FIG.

  When the extension seat 50 is mounted and face-to-face, the back plate 19 is set in a flat posture in advance and the front guard 61 passed between the front leg frames 16 and 16 is removed. The extension seat 50 is mounted so as to be superimposed on. Thereby, it can be set as a facing type.

  In general, the demand for a face-to-face system in a stroller is that a mother can lay down or run while checking the baby's face, particularly in a state where a young infant is laid down early. Therefore, it is preferable to wear the extension seat 50 when used for younger infants. As a result, the mother can lie down or run while checking the infant's face. With such a structure, a conventional so-called two-faced baby stroller is advantageous in terms of operability compared with the case where the rear specification and the face-to-face specification are realized by switching the handle. In other words, the conventional two-way stroller is designed mainly for use on the back for a long period of time, and when facing the caster, the position of the caster is in the front, making it difficult to make a small turn when operating. On the other hand, in the stroller of this embodiment, there is no difference in balance and operating force during operation, and stable operation is possible.

  In addition, in the stroller of the present embodiment, when the back plate 19 is made flat, the peripheral edge 71 of the back plate 19 corresponding to the backrest up to that time rises, so that the infant can be moved all around together with the extension seat 50. Therefore, the child can be safe.

  When the stroller is used face-to-face or rear-side, it is desirable to equip a hood so that infants are not exposed to direct sunlight or wind. In the present embodiment, the position of the hood can be attached to the upper part or the middle part of the front leg frame by the rear type or the face-to-face type, and both the face-to-face type and the back side type can be used.

As mentioned above, although the opening / closing apparatus which concerns on one Example of this invention, and the stroller provided with this opening / closing apparatus were demonstrated, this invention is not limited to the said Example at all.
For example, the lock mechanism for holding the folded state is not particularly limited, and various other configurations can be applied.

In the above-described embodiment, an example in which four fingers are inserted into the long hole 39 of the opening / closing device A has been described. However, the number of fingers inserted into the long hole 39 is not limited to four.
Furthermore, although it has been described that the operation button 36 is provided at a position where the operation button 36 is operated by the thumb, the present invention is not limited thereto, and for example, the operation button 36 may be provided inside the elongated hole 39 of the grip portion 35. In this case, it is desirable that the operation button is pressed by a finger other than the thumb (for example, a forefinger) inserted through the long hole 39.

DESCRIPTION OF SYMBOLS 10 Stroller 12a, 12b Handle 13a, 13b Rear wheel 14a, 14b Front wheel 15 Rear leg frame 16 Front leg frame 17a, 17b Link part 18 Bar 20 X-type frame 27 lambda-type coupling body 33 Main body trunk part 35 Grip part 34 Flat plate head Part 36 operation button 38 guide passage 39 slot 44 step

Claims (3)

A folding stroller opening and closing device in which a body frame with a lock function is folded in the width direction and the front-rear direction with the lock function released,
A pair of rear leg frames positioned on the back side of the body frame so as to cover a pivotal portion between the other ends of the pair of link members whose one ends are rotatably supported. A main body body that is mounted and formed with a guide passage that guides the bending operation of the pair of link members;
A flat plate head formed integrally with the main body body and arranged in a substantially horizontal posture;
The main body torso and the flat plate head are formed so as to be connected to each other, and have a grip portion with a long hole into which the thumb can be inserted and the remaining four fingers can be inserted from the side.
An opening / closing device for a folding stroller, wherein an operation button for the lock function is disposed at an upper end portion of the grip portion.   One end of the pair of link members is rotatably supported by one end of an X-shaped frame arranged in a manner in which two bars intersect, and the X-shaped frame 2. The folding baby stroller opening and closing device according to claim 1, wherein the other end portion is rotatably and immovably supported by the pair of rear leg frames.   A stroller comprising the opening and closing device according to claim 1.

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