CN112969625B - baby carriage - Google Patents

Abstract

The stroller (10) has: a main body frame (12) having front legs (14) and rear legs (16); a handle (40) swingably connected to the main body between a first position and a second position a frame connection; a first caster (50) fixed to the front leg and having a single front wheel; and a second caster fixed to the rear leg and having a pair of rear wheels. With the handle in the second position, the caster rotation of the first caster (50) is restricted. With the handle in the first position, the caster rotation of the second caster (60) is restricted.

Description

stroller

technical field

The present invention relates to a stroller with a handle that can swing between a first position and a second position.

Background technique

For example, as disclosed in Patent Document 1 (JP2017-81252A), a baby stroller capable of swinging a handle is known. In the stroller disclosed in Patent Document 1, the handle can swing between the rear push position and the facing push position. In the back push position, the handle is located on the back side of the infant, and the guardian pushes the stroller from the back side of the infant to advance the stroller. In the facing push position, the handle is on the side facing the infant, and the guardian pushes the stroller from the side facing the infant to advance the stroller.

With the handle in the rear push position, the infant can face forward in the direction of travel. When the handle is in the facing push position, the guardian can move the stroller while checking the infant. For this reason, in many cases, when a low-month-old infant is placed on a stroller, the handle is often placed in a position facing the push. For example, when an infant who can sit on the waist is placed on the stroller, the handle tends to be placed on the stroller. Place the handle in the rear push position.

As mentioned above, the position of the handle tends to change depending on the age of the infant. On the other hand, in the conventional stroller, no study has been conducted to change the characteristics according to the position of the handle. For example, it is preferable that when the handle is arranged in the facing push position, which tends to be suitable for infants of young age, the stability of the stroller can be improved, and on the other hand, the handle is preferably arranged in the facing push position. In the case where the push position is tended to be applied to the back of an infant of the age of six months, the maneuverability of the stroller can be improved.

SUMMARY OF THE INVENTION

The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to change the characteristics of the stroller according to the arrangement of the swingable handle.

The stroller of the present invention has:

a body frame having front and rear legs;

a handle connected to the body frame in a swingable manner between a first position and a second position;

A first caster including a first fixed body fixed to the front leg, a first rotating body supported on the first fixed body rotatably about the first caster axis, and rotatably supported a single front wheel on the first rotating body; and

A second caster having a second fixed body fixed to the rear leg, a second rotating body supported by the second fixed body rotatably about the second caster axis, and rotatably supported on a pair of rear wheels of the second rotating body,

When the handle is at the second position, the rotation of the first rotating body with respect to the first fixed body is restricted, and when the handle is at the first position, the first rotating body is restricted from rotating with respect to the first fixed body. The rotation of the two rotating bodies relative to the second fixed body is restricted.

In the stroller of the present invention, it may be:

The body frame has:

a first link connected to the front leg and the rear leg in a rotatable manner;

a second connecting rod connected to the first connecting rod in a rotatable manner;

a third link rotatably connected to the front leg; and

a fourth link, which is rotatably connected to the rear leg,

The second link is rotatably connected to at least one of the third link and the fourth link,

The third link is rotatably connected to at least one of the fourth link and the second link,

The fourth link is rotatably connected to at least one of the second link and the third link.

In the stroller of the present invention, the connection position where the third link and the fourth link are connected may be located rearward of the front leg in a side view.

In the stroller of the present invention, in a side view, the connection position at which the third link and the second link are connected may be located behind the front leg.

In the stroller of the present invention, the connection position at which the frame member and the base frame are connected may be located rearward of the front legs in a side view.

In the stroller of the present invention, it may be:

The main body frame has a pair of front legs spaced apart in the width direction and a pair of rear legs spaced apart in the width direction,

The first casters are respectively provided on the pair of front legs,

The second casters are respectively arranged on the pair of rear legs,

Among the pair of rear wheels of each second caster, the rear wheel located on the outer side in the width direction is located on the outer side in the width direction than the front wheel of the first caster on the same side as the second caster in the width direction.

In the stroller of the present invention, it may be:

The main body frame has a pair of front legs spaced apart in the width direction and a pair of rear legs spaced apart in the width direction,

The first casters are respectively provided on the pair of front legs,

The second casters are respectively arranged on the pair of rear legs,

In the width direction, the front wheel of each first caster is located between the pair of rear wheels of the second caster on the same side as the first caster in the width direction.

In the stroller of the present invention, in the width direction, the front wheel of each first caster may be positioned on the side of the second caster on the same side as the first caster in the width direction. The center of a pair of rear wheels.

In the stroller of the present invention, the distance between the pair of rear wheels in the width direction may be larger than the width of the front wheels.

In the stroller of the present invention, the distance between the pair of rear wheels in the width direction may be larger than the width of the first fixing body.

In the stroller of the present invention, it may be:

The first rotating body has: a first rotating body base connected to the first fixed body so as to be rotatable around the first caster axis; and a first rotating body holder connected to the first rotating body. the first rotating body base is connected, and the front wheel is rotatably supported via an axle,

In the width direction, the interval between the pair of rear wheels is greater than the width of the first rotating body base and greater than the width of the first rotating body holder.

In the stroller of the present invention, the stroller may be foldable in a state where the handle is arranged at the first position.

In the stroller of the present invention, the diameter of the front wheel may be smaller than the diameter of the rear wheel.

In the stroller of the present invention, the width of the rear wheel may be narrower than the width of the front wheel.

In the stroller of the present invention, it may be:

The main body frame has a pair of front legs spaced apart in the width direction and a pair of rear legs spaced apart in the width direction,

The first casters are respectively provided on the pair of front legs,

The second casters are respectively arranged on the pair of rear legs,

In the width direction, the first caster axis of each first caster is located at the same position as the second caster axis of the second caster on the same side as the first caster in the width direction.

In the stroller of the present invention, it may be:

The first rotating body has: a first rotating body base connected to the first fixed body in a manner that can rotate around the first caster axis; a first rotating body holder, which is connected to the first rotating body The first rotating body base is connected, and the front wheel is rotatably supported via an axle,

The first rotating body base includes a first opposing surface facing the first fixed body from below,

In the width direction, the width of the first opposing surface is smaller than the width of the first rotating body holder, and the first opposing surface is located within the range where the first rotating body holder is located.

In the stroller of the present invention, it may be:

The first rotating body has a first opposing surface facing the first fixed body from below,

The second rotating body has a second opposing surface facing the second fixed body from below,

The height of the first opposing surface is higher than the height of the second opposing surface.

In the stroller of the present invention, it may be:

The first rotating body has a first opposing surface facing the first fixed body from below,

The height of the first opposing surface is equal to or greater than the diameter of the front wheel.

In the stroller of the present invention, it may be:

The first rotating body has a first opposing surface facing the first fixed body from below,

The height of the first opposing surface is equal to or greater than the diameter of the rear wheel.

In the stroller of the present invention, it may be:

The second rotating body has a second opposing surface facing the second fixed body from below,

The height of the second opposing surface is smaller than the diameter of the front wheel.

In the stroller of the present invention, it may be:

The second rotating body has a second opposing surface facing the second fixed body from below,

The height of the second opposing surface is smaller than the diameter of the rear wheel.

According to the present invention, the characteristics of the stroller can be changed according to the arrangement of the swingable handle.

Description of drawings

FIG. 1 : is a figure for demonstrating one Embodiment of this invention, and is a perspective view for demonstrating the whole structure of a baby carriage.

Fig. 2 is a side view showing the stroller of Fig. 1 in a state in which the handle is arranged at a first position (rear push position).

Fig. 3 is a side view showing the stroller of Fig. 1 in a state where the handle is disposed at a second position (facing the push position).

Fig. 4 is a side view showing the stroller of Fig. 1 in a folded state.

FIG. 5 is a perspective view showing a portion of the stroller of FIG. 1 .

FIG. 6 is a front view showing a part of the stroller of FIG. 1 .

7A is a side view schematically showing the stroller of FIG. 1 with the handle in a first position.

7B is a side view schematically showing the stroller of FIG. 1 with the handle in the second position.

FIG. 8A is a rear view schematically showing the stroller of FIG. 1 .

FIG. 8B is a front view schematically showing the stroller of FIG. 1 .

Detailed ways

Hereinafter, an embodiment of the present invention will be described with reference to a specific example shown in the accompanying drawings.

1-8B is a figure for demonstrating one Embodiment of the baby carriage of this invention. 1 to 4 show the overall structure of a specific example of the stroller. 5 and 6 are perspective views or front views partially showing the stroller. As shown in FIGS. 1 to 4 , the stroller 10 of the present embodiment includes a main body frame 12 having front legs 14 and rear legs 16 , and a handle 40 swingably connected to the main body frame 12 with respect to the main body frame 12 . Connection; first caster 50, which is mounted on the front leg 14; and second caster 60, which is mounted on the rear leg 16. Among them, the main body frame 12 and the handle 40 constitute the stroller main body 11 . Moreover, as shown only by the dashed-two dotted line in FIG. 2 , the seat member 13 having cushioning properties is detachably attached to the stroller body 11 . Infants and toddlers sit or lie down on the seat member 13 .

In the present embodiment, the handle 40 is swingable relative to the main body frame 12 between the first position and the second position. In the illustrated example, the first position of the handle 40 is the rear push position (see FIGS. 1 and 2 ), and the second position of the handle 40 is the facing push position (see FIG. 3 ). As shown in FIG. 2 , the handle 40 is inclined with respect to the vertical direction and extends in the rearward direction at the first position, which is the rear push position. When the handle 40 is arranged at the first position which is the rear push position, the operator (guardian) handles the stroller 10 while holding the handle 40 from the back side of the infant. At this time, the infant can enjoy the scenery while facing forward in the traveling direction while the stroller 10 is traveling. As shown in FIG. 3 , the handle 40 is inclined with respect to the vertical direction and extends in the forward direction in the second position, which is the facing push position. When the handle 40 is arranged at the second position, which is the facing push position, the operator controls the stroller 10 by grasping the handle 40 from the position facing the front legs of the infant. At this time, the stroller 10 can be made to travel so that the rear leg side of the stroller 10 is forward in the traveling direction.

The illustrated stroller 10 (the stroller main body 11 ) is configured to be foldable from the unfolded state shown in FIGS. 1 and 2 to the folded state shown in FIG. 4 , as widely used. The stroller 10 (the stroller body 11 ) can also be unfolded from the folded state to the unfolded state. When the stroller 10 is in the unfolded state, the handle 40 can be swung relative to the main body frame 12 .

In addition, in this specification, the terms "front", "rear", top", "bottom", "front-rear direction", and "up-down direction" with respect to the stroller and its components are unless otherwise specified. , refers to the "front", "rear", "up", "down", "front-rear direction" and "up-down direction" based on the infant riding on the stroller and its structural elements in the unfolded state. More details In other words, the "front-rear direction" refers to the direction connecting the lower left and upper right of the paper of Fig. 1, and corresponds to the left-right direction of the paper of Fig. 2 and Fig. 3. In addition, unless otherwise specified, "front" refers to infants and toddlers riding in a car The facing side, the lower left side of the paper in Fig. 1 and the left side of the paper in Fig. 2 is the front side. On the other hand, the "up and down direction" is the direction perpendicular to the walking surface of the stroller. Therefore, in When the running surface is a horizontal plane, the "up and down direction" refers to the vertical direction. In addition, the "horizontal direction" refers to the width direction, which is a direction perpendicular to both the "front and rear direction" and the "up and down direction". As shown in Figure 1, the diagram The stroller 10 of the present invention as a whole has a substantially symmetrical structure with the planes located in the lateral center and along the front-rear direction and the vertical direction as the center.

First, the stroller main body 11 will be described as the overall structure of the stroller. As described above, the stroller body 11 has the body frame 12 and the handle 40 . Among them, as shown in FIG. 1 , the main body frame 12 has a pair of front legs 14 arranged on the left and right, respectively, and a pair of rear legs 16 arranged on the left and right, respectively. The main body frame 12 further includes a first link L1 , a second link L2 , a third link L3 , and a fourth link L4 arranged on the left and right, respectively. The front leg 14 , the rear leg 16 , and the first to fourth links L1 to L4 function as links that configure the stroller body 11 to be foldable and expandable. In the illustrated example, the first link L1 also functions as the armrest 21 . That is, the first link L1 is constituted by the armrest 21 .

As shown in FIGS. 1 to 3 , the upper end portion of the front leg 14 is rotatably (swingable) connected to the front portion of the first link L1 disposed on the corresponding side (left or right). Similarly, the upper end portion of the rear leg 16 is rotatably (swingable) connected to the front portion of the first link L1 arranged on the corresponding side (left or right). Further, the upper portion of the second link L2 is rotatably (swingable) connected to the rear portion of the first link L1 arranged on the corresponding side (left or right). As shown in FIG. 3 , in the illustrated example, the second link L2 includes a main link member 22 and an upper link member 23 fixed to the upper end of the main link member 22 . The main link member 22 is formed of, for example, a metal pipe. The upper connection member 23 is formed of, for example, a resin molded product. The second link L2 is rotatably (swingable) connected to the rear end portion of the armrest 21 at the upper connecting member 23 .

As shown in FIGS. 1 to 3 , the third link L3 is connected to the front leg 14 in a rotatable manner (swingable manner). The fourth link L4 is rotatably (swingable) connected to the rear leg 16 . The third link L3 is rotatably (swingable) connected to at least one of the second link L2 and the fourth link L4. The fourth link L4 is rotatably (swingable) connected to at least one of the second link L2 and the third link L3. The second link L2 is rotatably (swingable) connected to at least one of the third link L3 and the fourth link L4.

As shown in FIGS. 1 and 5 , in the illustrated example, the frame member 24 and the front link member 25 and the rear link member 26 fixed to the frame member 24 are provided as members constituting the third link L3 . The frame member 24 is formed of, for example, a bent metal pipe. The front connecting member 25 and the rear connecting member 26 are formed of, for example, resin moldings. The frame member 24 has a pair of side portions 24a extending in the front-rear direction, and a connecting portion 24b that connects the pair of side portions 24a in the front, and has a U-shape. The front connecting member 25 has one end portion rotatably connected to the front leg 14, and the other end portion is fixed to the front portion of the side portion 24a. The rear connecting member 26 is fixed to the rear end portion of the side portion 24a. In this example, the right third link L3 is formed by the side portion 24a of the frame member 24 on the right side, and the front link member 25 and the rear link member 26 fixed to the right side of the right side portion 24a. . Similarly, the left third link L3 is formed by the side portion 24a of the left frame member 24 and the left front link member 25 and the rear link member 26 fixed to the left side portion 24a.

As shown in FIG. 5 , in the illustrated example, the fourth link L4 has a main shaft member 28 rotatably connected to the rear leg 16 and an end member 29 fixed to an upper end portion of the main shaft member 28 . The main shaft member 28 is formed of, for example, a metal pipe. The end member 29 is formed of, for example, a resin molded product. The main shaft member 28 is rotatably connected to the middle portion of the rear leg 16 at the lower end portion. The end member 29 is rotatably connected to the second link L2 and the third link L3. In the illustrated example, the second link L2 , the third link L3 , and the fourth link L4 are rotatably connected to each other using the same shaft member 30 . The shaft member 30 penetrates through the main link member 22 of the second link L2, the end member 29 of the fourth link L4, and the rear connecting member 26 constituting the third link L3. According to this configuration, the second link L2 , the third link L3 , and the fourth link L4 are configured to be rotatable with each other about an axis that coincides with the central axis of the shaft member 30 .

In addition, as shown in FIGS. 1 to 3 , the main body frame 12 of the illustrated stroller 10 further includes a base frame 31 and an upper frame 32 and a connection frame 33 that connects the base frame 31 and the upper frame 32 . Both the base frame 31 and the upper frame 32 are formed in a U shape. Moreover, in the stroller 10 shown in the figure, the frame member 24 and the base frame 31 are stretched with a base cloth 34 (shown only in FIG. 2 ). The base fabric 34 supports the cushioning seat member 13 together with the frame member 24 , the base frame 31 , the upper frame 32 , and the connection frame 33 (shown only by the two-dot chain line in FIG. 2 ). In addition, in FIG. 4, illustration of the base frame 31, the upper frame 32, and the connection frame 33 is abbreviate|omitted.

In the example shown in the figure, the frame member 24 , the base frame 31 , the upper frame 32 , the connection frame 33 , and the base fabric 34 constitute a seat support body and support the seat member 13 . Among them, a part of the base fabric 34 and the frame member 24 constitute a seat support body that supports the buttocks of the infant. Furthermore, a part of the base fabric 34 and the base frame 31 constitute a back support body that supports the back of the infant.

Both ends of the base frame 31 are penetrated by the shaft members 30 (see FIG. 5 ). Furthermore, the base frame 31 is rotatable (swingable) with respect to the frame member 24 and other structural elements. By swinging the base frame 31 relative to the frame member 24, the seat member 13 can be reclined. The upper frame 32 is rotatably (swingable) connected to the rear end portion of the first link L1 at both end portions thereof. The rotation axis of the upper frame 32 relative to the first link L1 and the rotation axis of the second link L2 relative to the first link L1 are located on the same line. A pair of connection frames 33 are provided apart from each other in the lateral direction between the base frame 31 and the upper frame 32 . The connection frame 33 is rotatably connected to the base frame 31 and the upper frame 32 at both ends thereof.

As shown in FIG. 1 , the main body frame 12 has, as laterally extending structural elements, a front connecting member 15 connecting a pair of front legs 14 and a rear connecting member 17 connecting a pair of rear legs 16 . However, in the example shown in the figure, the front connecting member 15 extends between the pair of first casters 50 , and the rear connecting member 17 extends between the pair of second casters 60 . The front connecting member 15 functions as a footrest. Furthermore, a center connection member 27 is provided between the pair of rear connection members 26 . The deformation of the stroller 10 in the lateral direction can be suppressed by the front connecting member 15 , the rear connecting member 17 , and the center connecting member 27 . Furthermore, the protective member 38 having flexibility is detachably provided between the pair of first links L1.

The handle 40 is swingably connected to the main body frame 12 described above. In the illustrated example, the handle 40 includes a handle body 41 that is swingably attached to the main body frame 12 and a holder 42 that is provided to the handle body 41 . In the stroller body 11 shown in the figure, the handle 40 is capable of a first position inclined rearward from the vertical axis (rear push position) and a second position inclined forward from the vertical axis (face push position) in a side view. swing between.

As shown in FIG. 1 , the handle main body 41 includes a pair of shaft portions 41a extending substantially parallel to each other and an intermediate portion 41b connecting the pair of shaft portions 41a. The handle main body 41 has a substantially U-shaped shape as a whole. The handle 40 is rotatably (swingable) connected to the main body frame 12 at both ends of the U-shape. In the illustrated example, the handle main body 41 is rotatably connected to the main body frame 12 using the shaft member 30 . Therefore, the second link L2 , the third link L3 , the fourth link L4 , the base frame 31 , and the handle 40 can rotate relative to each other around the same axis defined by the shaft member 30 .

The holding body 42 is provided on the shaft portion 41 a of the handle body 41 . The holder 42 is movable on the shaft portion 41a along the longitudinal direction of the shaft portion 41a. The handle 40 has an urging member (for example, a spring) not shown, and the urging member presses the holding body 42 downward. The holding body 42 can be engaged with the first position holding member 36 and the second position holding member 37 provided on the main body frame 12 . As shown in FIG. 3 , the first position holding member 36 is provided on the second link L2. By engaging the holder 42 with the first position holding member 36 , the swing of the handle 40 with respect to the main body frame 12 is restricted, and the handle 40 can be maintained at the first position as shown in FIG. 2 . Moreover, as shown in FIG. 2, the 2nd position holding member 37 is provided in the 1st link L1. By engaging the holding body 42 with the second position holding member 37 , the swing of the handle 40 with respect to the main body frame 12 is restricted, and the handle 40 can be maintained at the second position as shown in FIG. 3 . For example, by moving the holding body 42 that has moved upward against the urging force of the urging member downward so as to cover the first position holding member 36 or the second position holding member 37 , the holding body 42 and the second position holding member 37 can be moved downward. The one position holding member 36 or the second position holding member 37 is engaged.

The stroller body 11 having the above-described configuration can be folded by relatively rotating the respective structural members. Specifically, the handle 40 disposed at the first position is once pulled up rearward and upward, and then pressed downward, whereby the fourth link L4 is rotated clockwise in FIG. 2 with respect to the rear leg 16 . Accompanying this operation, the first link L1 and the third link L3 are rotated clockwise in FIG. 2 with respect to the second link L2. By such an operation, the handle 40 and the front leg 14 approach each other while maintaining a substantially parallel arrangement in a side view, and the position of the handle 40 is lowered. As described above, as shown in FIG. 4 , the stroller body 11 can be folded. In the folded state of FIG. 4 , the dimensions of the stroller 10 in the front-rear direction and the vertical direction can be reduced in size. On the other hand, in order to unfold the stroller main body 11 from the folded state, it is only necessary to perform the steps opposite to the above-described folding operation.

In addition, the stroller main body 11 has a state maintaining mechanism (not shown) that restricts the relative rotation of the two components. By operating this state maintaining mechanism, the folding operation of the stroller body 11 can be performed. Moreover, in the example shown in figure, the handle|steering-wheel 40 has the remote control apparatus 43 connected with the state maintaining means. As shown in FIG. 1 , the remote operation device 43 is provided in the intermediate portion 41 b of the handle body 41 . By operating the remote control device 43 , the state maintaining mechanism is operated, and the folding operation of the stroller body 11 can be performed.

Next, the first caster 50 and the second caster 60 will be described. In addition, in the example shown in figure, the stroller main body 11 has a pair of front legs 14, and each front leg 14 holds the 1st caster 50. As shown in FIG. A pair of 1st caster 50 has the same structure or the structure which is substantially symmetrical with respect to the surface located in the horizontal center and along the front-back direction and the up-down direction. Similarly, the stroller body 11 has a pair of rear legs 16, and each rear leg 16 holds the second caster 60. As shown in FIG. A pair of 2nd caster 60 has the same structure or the structure which is located in the horizontal center, and is substantially symmetrical about the surface along the front-back direction and the up-down direction. Hereinafter, the first caster 50 and the second caster 60 located on the left side in the lateral direction shown in FIGS. 1 to 6 will be described.

As shown in FIG. 5 , the first caster 50 includes: a first fixed body 51 attached to the lower end portion of the front leg 14; a first rotating body 52 rotatably supported by the first fixed body 51; It is supported on the front wheel 56 of the first rotating body 52 in a manner. The first rotating body 52 is connected to the first fixed body 51 . The first rotating body 52 is rotatable with respect to the first stationary body 51 about the first caster axis C1 (see FIG. 2 ) extending in the vertical direction. The first rotating body 52 has a first opposing surface SS1 facing the first fixed body 51 from below. In particular, in the example shown in the figure, the first rotating body 52 is in contact with the first stationary body 51 from below at the first opposing surface SS1. During the relative rotation of the first rotating body 52 and the first fixed body 51 around the first caster axis C1 , the first fixed body 51 relatively slides on the first opposing surface SS1 of the first rotating body 52 .

As shown in FIG. 5 , the first rotating body 52 has a first rotating body base 53 connected to the first fixed body 51 , a first rotating body holder 54 connected to the first rotating body base 53 , and a first rotating body holder 54 supported on the first rotating body base 53 . The first axle 55 of the rotating body holder 54 . In this example, the first rotating body base 53 includes the first opposing surface SS1. The first rotating body base 53 is rotatable with respect to the first fixed body 51 about the first caster axis C1 . The first rotating body holder 54 is connected to the first rotating body base 53 via, for example, a shock absorbing buffer member.

The illustrated first rotating body holder 54 has a connecting portion 54a connected to the first rotating body base 53 and a pair of arm portions 54b extending from the connecting portion 54a. As an example, the connecting portion 54a is provided with a hole portion into which the shaft portion extending downward from the first fixing body 51 is inserted, so that the shaft portion of the first fixing body 51 is restricted from being pulled out of the hole portion of the connecting portion 54a. With such a structure, the first fixed body 51 and the first rotating body 52 are connected in a relatively rotatable manner. The arm portion 54b has a longitudinal direction. The pair of arm parts 54b extend from the connection part 54a so that the longitudinal directions of the pair are parallel to each other and spaced apart from each other in the direction perpendicular to the longitudinal direction. The first axle 55 is supported by the ends of the pair of arm portions 54b on the side away from the connection portion 54a. The first axle 55 extends parallel to the running surface. The front wheel 56 is supported by the first axle 55 . Therefore, the front wheel 56 is rotatably arranged between the pair of arm portions 54b. That is, each first caster 50 has only one front wheel 56 .

As shown in FIG. 6 , in the width direction of the stroller 10 in the straight running state, the width of the first opposing surface SS1 is smaller than the width W54 of the rotating body holder 54, and the first opposing surface SS1 is located on the rotating body holder. 54 is in the range. According to such an example, the first opposing surface SS1 is positioned on the rotating body holder 54 that holds the front wheel 56 in the vertical projection. Furthermore, the front wheel 56 is positioned on the first caster axis C1 of the first caster 50 in the width direction of the stroller 10 in the straight running state. Therefore, the first rotating body 52 can stably support the first fixed body 51 via the first opposing surface SS1, thereby stabilizing the walking of the stroller. In addition, in the example shown in the figure, the width of the first opposing surface SS1 corresponds to the maximum width W53 of the first rotating body base.

As shown in FIG. 5 , the first caster 50 further includes a braking member 57 operably provided on the first rotating body holder 54 that supports the front wheel 56 . The braking member 57 can be brought into contact with the front wheel 56 by relatively moving with respect to the first rotating body holder 54 to restrict the rotation of the front wheel 56 . The illustrated brake member 57 is swingably supported by the arm portion 54b positioned on the inner side in the width direction of the first rotating body holder 54 .

In addition, the inner side (inner side) in the width direction refers to the side close to the center of the stroller 10 in the width direction. The outer side (outer side) in the width direction refers to the side away from the center of the stroller 10 in the width direction.

As shown in FIG. 5 , the second caster 60 includes a second fixed body 61 attached to the lower end portion of the rear leg 16 , a second rotating body 62 rotatably supported by the second fixed body 61 , and a second rotatable body 62 . The rear wheel 66 is supported by the second rotating body 62 . The second rotating body 62 is connected to the second fixed body 61 . The second rotating body 62 is rotatable with respect to the second fixed body 61 about the second caster axis C2 (see FIG. 2 ) extending in the vertical direction. The second rotating body 62 has a second opposing surface SS2 facing the second fixed body 61 from below. In particular, in the example shown in the figure, the second rotating body 62 is in contact with the second fixed body 61 from below at the second opposing surface SS2. During the relative rotation of the second rotating body 62 and the second fixed body 61 around the second caster axis C2 , the second fixed body 61 relatively slides on the second opposing surface SS2 of the second rotating body 62 .

As shown in FIG. 5 , the second rotating body 62 has a second rotating body base 63 connected to the second fixed body 61 and a second axle 65 supported by the second rotating body base 63 . In this example, the second rotating body base 63 includes the second opposing surface SS2. The second axle 65 penetrates the second rotating body base 63 and extends to both sides of the second rotating body base 63 . The second axle 65 extends parallel to the running surface. The rear wheels 66 are respectively rotatably supported by portions of the second axle 65 extending from the second rotating body base 63 to both sides. That is, each of the first casters 50 has a pair of rear wheels 66 . The second rotating body base 63 is located between the pair of rear wheels 66 .

As shown in FIG. 1 , the second caster 60 further includes a braking member 67 operably provided on the second rotating body base 63 supporting the rear wheel 66 . The braking member 67 can be brought into contact with the rear wheel 66 by relatively moving with respect to the second rotating body base 63 to restrict the rotation of the rear wheel 66 . The illustrated brake member 67 is swingably supported on the second rotating body base 63 .

Moreover, as shown in FIG. 2, the 1st caster 50 has the lock member 58 which restricts the rotation of the 1st rotating body 52 with respect to the 1st fixed body 51. The locking member 58 is movable between a restricted position and an unrestricted position. For example, when the locking member 58 in the restricting position protrudes from the first fixed body 51 and contacts the first rotating body 52 , the rotation of the first rotating body 52 with respect to the first fixed body 51 about the first caster axis C1 can be restricted. . On the other hand, the locking member 58 in the non-restricting position is separated from the first rotating body 52 so as not to interfere with the rotational motion of the first rotating body 52 relative to the first fixed body 51 .

Similarly, as shown in FIG. 2 , the second caster 60 has a locking member 68 that restricts the rotation of the second rotating body 62 relative to the second fixed body 61 . The locking member 68 is movable between a restricted position and an unrestricted position. For example, when the locking member 68 in the restricting position protrudes from the second fixed body 61 and contacts the second rotating body 62 , the second rotating body 62 can be restricted from rotating about the second caster axis C2 with respect to the second fixed body 61 . . On the other hand, the locking member 68 in the non-restricting position is separated from the second rotating body 62 so as not to interfere with the rotational motion of the second rotating body 62 relative to the second fixed body 61 .

Furthermore, as shown in FIG. 2, the stroller main body 11 has the switching mechanism 45 which moves the locking members 58 and 68 between the restricting position and the non-restricting position according to the position of the handle 40. In the illustrated example, the switching mechanism 45 includes a switching member 46 movably supported by the rear legs 16 , and a transmission member 47 connecting the switching member 46 and the locking members 58 and 68 . In the illustrated example, the switching member 46 is brought into contact with the handle 40 as the handle 40 swings. By the contact with the handle 40, a relative motion such as a linear motion or a rotational motion of the switching member 46 with respect to the rear leg 16 can be caused, and as a specific example, a relative swing motion can be caused. The locking members 58 and 68 can be operated via the transmission member 47 by the operation of the switching member 46 .

Furthermore, in the present embodiment, when the handle 40 is located at the second position, the rotation of the first rotating body 52 in the first caster 50 with respect to the first fixed body 51 is restricted. Furthermore, when the handle 40 is in the first position, the rotation of the second rotating body 62 in the second caster 60 with respect to the second fixed body 61 is restricted. In the illustrated example, when the handle 40 is in the first position (the position of the handle 40 shown in FIG. 2 ), which is the rear push position, the rotation of the first rotating body 52 of the first caster 50 is allowed, and the rotation of the first rotating body 52 is restricted. Rotation of the second rotating body 62 of the second caster 60 . On the other hand, when the handle 40 is in the second position (the position of the handle 40 shown in FIG. 3 ) that is the facing push position, the rotation of the first rotating body 52 of the first caster 50 is restricted and the second Rotation of the second rotating body 62 of the caster 60 .

In addition, the switching mechanism 45 and the locking members 58 and 68 can employ various well-known structures, for example, those disclosed in Japanese Patent Laid-Open No. 2008-254688, Japanese Patent Laid-Open No. 2008-254693, and Japanese Patent Laid-Open No. 2010-234988 can be used. Structure.

Next, the operation of the stroller 10 having the above-described configuration will be described. As described above, the handle 40 is swingable relative to the main body frame 12 between the first position and the second position.

As shown in FIG. 2 , when the handle 40 is arranged at the first position, which is the rear push position, the operator (guardian) can hold the handle 40 from the back side of the infant to operate the stroller 10 so that the infant faces The stroller 10 is made to travel forward in the traveling direction. At this time, the front legs 14 are positioned forward in the traveling direction of the stroller 10 , and the rear legs 16 are positioned rearward in the traveling direction of the stroller 10 . Moreover, in the 1st caster 50 attached to the front leg 14, the 1st rotating body 52 can rotate about the 1st caster axis line C1 with respect to the 1st fixed body 51. On the other hand, in the second caster 60 attached to the rear leg 16 , the second rotating body 62 cannot rotate about the second caster axis C2 with respect to the second fixed body 61 .

As shown in FIG. 3 , when the handle 40 is arranged at the second position, which is the facing push position, the operator can operate the stroller 10 by grasping the handle 40 from the position facing the front leg 14 side of the infant. The stroller 10 is made to travel so that the rear leg side of the stroller 10 is forward in the traveling direction. At this time, the rear legs 16 are positioned forward in the traveling direction of the stroller 10 , and the front legs 14 are positioned rearward in the traveling direction of the stroller 10 . Furthermore, in the first caster 50 attached to the front leg 14 , the first rotating body 52 cannot rotate about the first caster axis C1 with respect to the first fixed body 51 . On the other hand, in the second caster 60 attached to the rear leg 16 , the second rotating body 62 is rotatable about the second caster axis C2 with respect to the second fixed body 61 .

That is, as the holding position of the handle 40 is switched between the first position and the second position, the ability to rotate the rotating bodies 52 and 62 supporting the wheels 56 and 66 around the caster axes C1 and C2 as the center is switched. . Specifically, the casters 50 and 60 located forward in the moving direction of the stroller 10 function as casters, and the revolving bodies 52 and 62 supporting the wheels 56 and 66 rotate about the caster axes C1 and C2 . On the other hand, the casters 50 and 60 located rearward in the moving direction of the stroller 10 do not function as casters, and the rotation of the revolving bodies 52 and 62 supporting the wheels 56 and 66 about the caster axes C1 and C2 is restricted. By switching the caster mechanism according to the swing position of the handle 40 in this way, the operability of the baby carriage 10 by the operator (guardian) can be improved.

In addition, when the handle 40 is in the first position, which is the rear push position, the infant can face forward in the traveling direction. Therefore, during the walking of the stroller 10, the infant can observe the scenery and enjoy the scenery. When the handle 40 is in the second position, which is the facing push position, the guardian can walk the stroller 10 while checking the state of the infant. Therefore, when placing a young infant on the stroller 10, the handle 40 is often arranged at the second position facing the push position, and for example, when placing an infant who can sit on the stroller 10 o'clock, the handle 40 tends to be disposed at the first position, which is the rear push position.

When a low-month-old infant is placed on the stroller 10, the stroller 10 requires walking stability. According to the stroller 10 shown in the figure, the stroller 10 in a state where the handle 40 is disposed in the second position, which is the push position, is disposed in the stroller 10 in the push-facing state which tends to be used for infants and toddlers of young age. , the rear legs 16 are located forward in the direction of movement. Furthermore, the second caster 60 attached to the rear leg 16 has a double-wheel structure and includes a pair of rear wheels 66 . The second caster 60 has the characteristics of a large landing area, high strength, and excellent load resistance. Therefore, when the second caster 60 is positioned forward in the moving direction and functions as a caster, since the second caster 60 has a double-wheel structure, excellent walking stability is realized.

In addition, the second caster 60 of the double-wheel structure has a pair of rear wheels 66 separated in the direction perpendicular to the traveling direction. Therefore, it is possible to effectively avoid a situation where the entire second caster 60 , that is, both of the pair of rear wheels 66 are fitted into recesses such as grooves formed on the running surface. That is, even if the one rear wheel 66 of the one second caster 60 is positioned on the concave portion, since the other rear wheel 66 is maintained on the running surface, the second caster 60 can be effectively prevented from being embedded in the concave portion. Thereby, generation of an undesired shock can be effectively suppressed, and also in this point, the running stability can be improved.

That is, in the stroller 10 in a state in which the handle 40 is disposed at the second position facing the push position, the second caster 60 functions as a caster positioned forward in the moving direction, and thus it is possible to appropriately obtain a tendency to be placed on the stroller 10 . The walking stability required by the infant of the baby carriage 10 at a young age.

On the other hand, infants and toddlers gain weight as they grow. The baby carriage 10 requires maneuverability (steerability, walking maneuverability) along with an increase in weight. Furthermore, as described above, the stroller 10 is used with the handle 40 disposed at the first position as the rear push position along with the growth of the infant, so that the infant can enjoy going out using the stroller 10 . In the stroller 10 of the present embodiment, the front legs 14 are positioned forward in the moving direction in a state where the handle 40 is disposed at the first position, which is the rear push position. Furthermore, the first caster 50 mounted on the front leg 14 has a single-wheel structure and includes only one front wheel 56 . In the first caster 50, the frictional resistance between the running surface and the front wheel 56 is reduced, so that the first rotating body 52 can be easily rotated with respect to the first fixed body 51 about the first caster axis C1. Therefore, the front wheel 56 can be easily rotated relative to the first fixed body 51 together with the first rotating body 52 by the force applied to the handle 40, so that excellent maneuverability can be exhibited.

As described above, by positioning the handle 40 at the second position, which is the facing push position, the second caster 60 functions as a caster positioned forward in the moving direction, and as a result, the stroller 10 is given a tendency to be placed on the stroller. The walking stability required by infants and young children under the age of 10 months. On the other hand, by positioning the handle 40 at the first position, which is the rear push position, the first caster 50 functions as a caster positioned forward in the moving direction, thereby giving the stroller 10 a length that tends to be placed on the stroller 10 . the manipulation required by infants and young children. That is, the characteristics of the stroller 10 can be changed according to the arrangement of the swingable handle 40 , and in particular, the characteristics required according to the position of the handle 40 can be imparted to the stroller 10 .

In addition, the main body frame 12 of the illustrated baby carriage 10 has: a first link L1 rotatably connected to the front leg 14 and the rear leg 16; and a second link L2 rotatably connected to the first link L2 A rear end portion of a link L1 is connected; a third link L3 is rotatably connected to the front leg 14 ; and a fourth link L4 is rotatably connected to the middle portion of the rear leg 16 . The second link L2 is rotatably connected to at least one of the third link L3 and the fourth link L4. Furthermore, the third link L3 is rotatably connected to at least one of the fourth link L4 and the second link L2. Furthermore, the fourth link L4 is rotatably connected to at least one of the second link L2 and the third link L3.

In such a stroller 10, the center of gravity of the infant placed on the stroller 10 is closer to the rear legs 16 than the front legs 14 in the front-rear direction. In particular, in the illustrated stroller 10, when viewed from the side as shown in FIGS. 2 and 3 , the connecting position (axis) where the third link L3 is connected to the fourth link L4 and the second link L2 The position of the member 30 ) is located rearward of the rear legs 16 , in particular, in such a stroller 10 , the center of gravity of the infant tends to be closer to the rear legs 16 than the front legs 14 in the front-rear direction. Therefore, in the stroller 10 shown in the figure, the weight of the infant is mainly supported by the rear legs 16 and the second casters 60 fixed to the lower ends of the rear legs 16 . As described above, the second caster 60 has a pair of rear wheels 66 spaced apart in the width direction. Therefore, the second caster 60 has the characteristics of a large landing area, high strength, and excellent load resistance. Thereby, according to the stroller 10 shown in the figure, the weight of the infant can be stably supported.

In addition, generally, the position of the center of gravity of the infant placed on the stroller also depends on the reclining angle, but is generally located at the rear portion of the seat support body that supports the buttocks of the infant. In particular, the position of the center of gravity of the infant on the stroller tends to be in the vicinity of the connection position where the seat support is connected to the back support that supports the infant's back. In the stroller 10 shown in the figure, the base fabric 34 and the frame member 24 for adjusting the base fabric 34 constitute a seat support body that supports the buttocks of the infant via the seat member 13 . Furthermore, the base fabric 34 and the base frame 31 for adjusting the base fabric 34 constitute a back support body that supports the back of the infant via the seat member 13 . Therefore, the center of gravity CG of the infant placed on the stroller 10 shown in the figure is located at the rear portion of the frame member 24 in the front-rear direction, regardless of the position of the handle 40 that can swing as shown in FIGS. 7A and 7B . More strictly speaking, it is located on the rotatable connection position of the base frame 31 and the frame member 24 , that is, on the periphery of the shaft member 30 . Therefore, the center of gravity CG of the infant placed on the stroller 10 is closer to the rear legs 16 than the front legs 14 in the front-rear direction. Therefore, the body weight of the infant is stably supported via the second casters 60 that are attached to the rear legs 16 and include a pair of rear wheels 66 .

Further, as shown in FIGS. 7A and 7B , the distance LY in the front-rear direction from the center of gravity CG of the infant to the grounding position of the rear wheel 66 is larger than the distance LY in the front-rear direction from the center of gravity CG of the infant to the grounding position of the front wheel 56 in the front-rear direction. Short distance from LX. There is a tendency that the stability of such a stroller 10 against shaking, warping, deformation, tipping (tilting), etc. in the width direction depends on the widthwise position of the rear wheels 66 .

On the other hand, as shown in FIG. 6 , among the pair of rear wheels 66 of each second caster 60 , the rear wheel 66 located on the outer side in the width direction is more than located on the same side (left or right) as the second caster 60 in the width direction. The front wheel 56 of the first caster 50 on the side) is located on the outer side in the width direction. Therefore, the tilt angle θ2 (see FIG. 8A ) of the stroller 10 in which the center of gravity CG of the infant is located outside the rear wheel 66 in the width direction is located outside the front wheel 56 in the width direction relative to the center of gravity CG of the infant. The inclination angle θ1 (see FIG. 8B ) of the stroller 10 at the position is large. Therefore, in the stroller 10 shown in the figure, the second caster 60 including the pair of rear wheels 66 exhibits excellent stability against lateral shaking, warping, deformation, tipping (tilting), and the like.

In particular, in the stroller 10 shown in the figure, the front legs 14 and the rear legs 16 are located in a region where the front legs 14 and the rear legs 16 overlap each other in the width direction, and the front legs 14 and the front wheels 56 of the first casters 50 are also located in the width direction with each other. overlapping area. Furthermore, in the width direction, the front wheel 56 of each first caster 50 is positioned between the pair of rear wheels 66 of the second caster 60 on the same side as the first caster 50 in the width direction. Therefore, it is possible to ensure excellent stability against deformation or inclination in the width direction, while suppressing enlargement of the stroller 10 and imparting an excellent appearance.

In particular, in the stroller 10 shown in the figure, as shown in FIG. 6 , in the width direction of the straight running state, the front wheels 56 of the first casters 50 are located on the same side in the width direction of the first casters 50 . The center of the pair of rear wheels 66 of the second caster 60 . Therefore, the running stability can be further improved, and excellent straightness can be exhibited.

In addition, in the stroller 10 shown in the figure, the first caster axis C1 of each first caster 50 in the width direction is the same as the second caster of the second caster 60 located on the same side as the first caster 50 in the width direction. The axis C2 is located at the same position. Therefore, the running stability can be improved, and the steering performance and the running operability can be improved.

In addition, as shown in FIG. 2 , the diameter D1 of the front wheel 56 of the first caster 50 is smaller than the diameter D2 of the rear wheel 66 of the second caster 60 . According to the first caster 50 as described above, the rotation of the first rotating body 52 with respect to the first stationary body 51 about the first caster axis C1 can be generated more easily. Thereby, the operability of the stroller 10 can be further improved when the handle 40 is located at the first position, which is the rear push position.

In addition, the illustrated stroller 10 can start the folding operation from the unfolded state only when the handle 40 is arranged in the first position. Furthermore, in the folded stroller 10, the first rotating body 52 and the front wheel 56 of the first caster 50 are allowed to rotate relative to the first fixed body 51, and restrict the rotation of the first rotating body 52 and the front wheel 56 of the first caster 50, as in the stroller 10 in which the handle 40 is in the first position. The second rotating body 62 and the rear wheel 66 of the second caster 60 rotate relative to the second fixed body 61 . That is, in the folded state, the diameter of the front wheel 56 that is rotatable about the first caster axis C1 with respect to the first fixed body 51 is small. According to such a stroller 10 , as shown in FIG. 4 , the standing posture of the stroller 10 in the folded state can be effectively stabilized.

In addition, as shown in FIG. 6 , in the stroller 10 in the straight-running state, that is, in the stroller 10 traveling in a direction parallel to the front-rear direction, the front wheels 56 of the first casters 50 are located in the same direction as the first casters 50 . Between the pair of rear wheels 66 of the second caster 60 on the same side in the width direction. In particular, the outer end in the width direction of the front wheel 56 is closer to the inner side in the width direction than the inner end in the width direction of the rear wheel 66 located on the outer side in the width direction, and the inner end in the width direction of the front wheel 56 is closer to the inner end in the width direction of the rear wheel 66 located on the inner side in the width direction. The outer end in the width direction is more toward the outer side in the width direction. In other words, in the stroller 10 in the straight traveling state, the interval S2 in the width direction of the pair of rear wheels 66 is larger than the width W1 in the width direction of the front wheels 56 . According to such a stroller 10 , the fall of the stroller 10 in the width direction can be effectively suppressed, and the straight running state of the stroller 10 can be effectively stabilized.

In addition, in the example shown in FIG. 6 , in the width direction of the stroller 10 in the straight-running state, the distance S2 between the pair of rear wheels 66 is larger than the width W51 of the first fixed body 51 . In addition, in the stroller 10 in the straight-running state, the distance S2 in the width direction of the pair of rear wheels 66 is larger than the width W53 of the first rotating body base 53 of the first rotating body 52 in the width direction, and is larger than the width W53 of the first rotating body 52 in the width direction. The width W54 of the first rotating body holder 54 of the one rotating body 52 in the width direction is large. According to such an example, the handle 40 can be placed in the first position (the position of the handle 40 shown in FIG. 2 ), which is the rear push position, while being excellent in operability, and the handle 40 can be placed in the first position, which is the facing push position. In the case of the two positions (position of the handle 40 shown in FIG. 3 ), the walking stability is more excellent.

In one embodiment described above, the stroller 10 has: a main body frame 12 having front legs 14 and rear legs 16; and a handle 40 swingably connected to the main body frame between a first position and a second position 12 connection; a first caster 50, which is mounted on the front leg 14; and a second caster 60, which is mounted on the rear leg 16. The first caster 50 has: a first fixed body 51 fixed to the front leg 14; a first rotating body 52 supported by the first fixed body 51 so as to be rotatable about the first caster axis C1; and a single front The wheel 56 is rotatably supported by the first rotating body 52 . The second caster 60 includes: a second fixed body 61 fixed to the rear leg 16; a second rotating body 62 supported by the second fixed body 61 so as to be rotatable about the second caster axis C2; and a pair of The rear wheels 66 are rotatably supported by the second rotating body 62 . Furthermore, when the handle 40 is at the second position, the rotation of the first rotating body 52 relative to the first fixed body 51 is restricted, and when the handle 40 is at the first position, the second rotating body 62 is relative to the second rotating body 62 . The rotation of the fixed body 61 is restricted.

According to this one embodiment, by setting the handle 40 in the second position, the second caster 60 functions as a caster positioned forward in the moving direction, and thus the walking stability of the stroller 10 can be improved. On the other hand, by setting the handle 40 at the first position, the first caster 50 functions as a caster positioned forward in the moving direction, and the operability of the stroller 10 can be improved. That is, the characteristics of the stroller 10 can be changed according to the arrangement of the swingable handle 40 .

In addition, in the example shown in FIG. 6, the width W2 of the rear wheel 66 is narrower than the width W1 of the front wheel 56 in the width direction of the stroller 10 in a straight state. According to such an example, it is possible to maintain the walking stability in the state in which the handle 40 is disposed at the second position, maintain the operability in the state in which the handle 40 is disposed in the first position, and improve the disposition of the handle 40 in the second position. The maneuverability in the state of the position is improved, and the walking stability in the state in which the handle 40 is arranged in the first position is improved.

Moreover, in the stroller 10 shown in the figure, the front wheel 56 of the first caster 50 overlaps the position of the first fixed body 51 in the width direction. Furthermore, the front wheel 56 of the first caster 50 overlaps the first caster axis C1 in the width direction. As shown in FIG. 2 , in such a stroller 10, it was confirmed that by increasing the height H1 of the first opposing surface SS1 of the first rotating body 52 of the first caster 50, the handle 40 was disposed on the first In the state of the position, it is easier to rotate the first rotating body 52 about the caster axis C1 with respect to the first fixed body 51 . That is, by making the height H1 of the 1st opposing surface SS1 high, the operability in the state arrange|positioned at the 1st position of the handle|steering-wheel 40 can be improved further.

On the other hand, in the stroller 10 shown in the figure, the rear wheel 66 of the second caster 60 is located at a position shifted in the width direction from the second fixed body 61 . Therefore, the rear wheel 66 of the second caster 60 is shifted in the width direction from the second caster axis C2. As shown in FIG. 2 , in such a stroller 10, it was confirmed that the handle 40 was disposed on the second side by reducing the height H2 of the second opposing surface SS2 of the second rotating body 62 of the second caster 60. Undesired rotation of the second fixed body 61 with respect to the second rotating body 62 about the caster axis C1 can be effectively suppressed in the state of the position. That is, by reducing the height H2 of the second opposing surface SS2, it is possible to further improve the walking stability in a state where the handle 40 is arranged at the second position.

Furthermore, in the example shown in the figure, the height H1 of the first opposing surface SS1 is higher than the height H2 of the second opposing surface S2. The height H1 of the first opposing surface SS1 is equal to or greater than the diameter D1 of the front wheel 56 . The height H1 of the first opposing surface SS1 is equal to or greater than the diameter D2 of the rear wheel 66 . According to such a structure, the operability in the state where the handle|steering-wheel 40 is arrange|positioned at the 1st position can be made more excellent.

Similarly, in the example shown in the figure, the height H1 of the first opposing surface SS1 is higher than the height H2 of the second opposing surface S2. The height H2 of the second opposing surface SS2 is smaller than the diameter D1 of the front wheel 56 . The height H2 of the second opposing surface SS1 is smaller than the diameter D2 of the rear wheel 66 . According to such a structure, the walking stability in the state where the handle|steering-wheel 40 is arrange|positioned at the 2nd position can be made more excellent.

One embodiment has been described with reference to the illustrated specific example, but the illustrated specific example is not intended to limit one embodiment. The above-described one embodiment can be implemented in other various specific examples, and various omissions, substitutions, changes, additions, and the like can be made without departing from the gist. For example, in the above-described specific example, only when the handle 40 is arranged at the first position, the stroller 10 can start the folding operation from the unfolded state to the folded state, but it is not limited to this. For example, the stroller 10 may start the folding operation only when the handle 40 is arranged at the second position, or the stroller 10 may start the folding operation regardless of whether the handle 40 is arranged at the first position or the second position.

Claims (10)

1. A stroller comprising: a body frame having front and rear legs; a handle connected to the body frame in a swingable manner between a first position and a second position; A first caster including a first fixed body fixed to the front leg, a first rotating body supported on the first fixed body rotatably about the first caster axis, and rotatably supported a single front wheel on the first rotating body; and A second caster having a second fixed body fixed to the rear leg, a second rotating body supported by the second fixed body rotatably about the second caster axis, and rotatably supported on a pair of rear wheels of the second rotating body, When the handle is in the second position, the rotation of the first rotating body relative to the first fixed body is restricted, and the rotation of the second rotating body relative to the second fixed body is restricted Allowing, when the handle is in the first position, the rotation of the second rotating body relative to the second fixed body is restricted, and the rotation of the first rotating body relative to the first fixed body rotation is allowed, The diameter of the front wheel is smaller than the diameter of the rear wheel. 2. A stroller comprising: a body frame having front and rear legs; a handle connected to the body frame in a swingable manner between a first position and a second position; A first caster including a first fixed body fixed to the front leg, a first rotating body supported on the first fixed body rotatably about the first caster axis, and rotatably supported a single front wheel on the first rotating body; and A second caster having a second fixed body fixed to the rear leg, a second rotating body supported by the second fixed body rotatably about the second caster axis, and rotatably supported on a pair of rear wheels of the second rotating body, When the handle is in the second position, the rotation of the first rotating body relative to the first fixed body is restricted, and the rotation of the second rotating body relative to the second fixed body is restricted Allowing, when the handle is in the first position, the rotation of the second rotating body relative to the second fixed body is restricted, and the rotation of the first rotating body relative to the first fixed body rotation is allowed, The width of the rear wheel is narrower than the width of the front wheel. 3. The stroller according to claim 1 or 2, wherein, The first rotating body has: a first rotating body base connected to the first fixed body so as to be rotatable around the first caster axis; and a first rotating body holder connected to the first rotating body. the first rotating body base is connected, and the front wheel is rotatably supported via an axle, The first rotating body base includes a first opposing surface facing the first fixed body from below, In the width direction, the width of the first opposing surface is smaller than the width of the first rotating body holder, and the first opposing surface is located within the range where the first rotating body holder is located. 4. The stroller of claim 1 or 2, wherein, The first rotating body has a first opposing surface facing the first fixed body from below, The second rotating body has a second opposing surface facing the second fixed body from below, The height of the first opposing surface is higher than the height of the second opposing surface. 5. The stroller of claim 1 or 2, wherein, The first rotating body has a first opposing surface facing the first fixed body from below, The height of the first opposing surface is equal to or greater than the diameter of the front wheel. 6. The stroller of claim 1 or 2, wherein, The first rotating body has a first opposing surface facing the first fixed body from below, The height of the first opposing surface is equal to or greater than the diameter of the rear wheel. 7. The stroller of claim 1 or 2, wherein, The second rotating body has a second opposing surface facing the second fixed body from below, The height of the second opposing surface is smaller than the diameter of the front wheel. 8. The stroller of claim 1 or 2, wherein, The second rotating body has a second opposing surface facing the second fixed body from below, The height of the second opposing surface is smaller than the diameter of the rear wheel. 9. The stroller of claim 1 or 2, wherein: When the handle is in the first position, the first rotating body can rotate relative to the first fixed body around the first caster axis, and the second rotating body cannot rotate relative to the first caster axis. The second fixed body rotates around the second caster axis. 10. The stroller of claim 1 or 2, wherein, When the handle is in the second position, the first rotating body cannot rotate relative to the first fixed body around the first caster axis, and the second rotating body can rotate relative to the first caster axis. The second fixed body rotates around the second caster axis.

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