Baby carriage

Abstract

The invention relates to a baby carriage. The stroller body (11) includes: a body frame (12) including front legs (14) and rear legs (16); a handle (30) attached to the main body frame (12) so as to be swingable; a seat support unit (40) held by the main body frame (12); a front wheel rotating shaft holding member (18c) that holds the front wheel rotating shaft (18b); and a rear wheel rotating shaft holding member (19c) that holds the rear wheel rotating shaft (19b). The front wheel rotating shaft holding member (18c) is connected to the front leg (14), and the rear wheel rotating shaft holding member (19c) is connected to the rear leg (16). The front wheel rotating shaft holding member (18c) is movable in the front-rear direction with respect to the front leg (14). The rear wheel rotating shaft holding member (19c) is movable in the front-rear direction with respect to the rear leg (16).

Description

Technical Field

[0001] The present invention relates to a baby carriage. Background Art

[0002] Strollers for taking infants out are becoming increasingly popular. The stroller includes a seat support unit that supports a seat on which the infant sits, a main frame that supports the seat support unit, and a handle mounted on the main frame. The operator of the stroller (guardian, etc.) can adjust the direction of travel of the stroller and change the inclination of the stroller to go over steps by operating the handle. Patent document 1 discloses a stroller in which the position of the handle can be switched between a back-pushing position and a face-to-face pushing position.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-202982 Summary of the invention

[0004] In a baby stroller in which the position of the handle can be switched between a back-pushing position and a face-to-face pushing position, generally, the distance in the front-to-back direction between the rear wheel and the center of gravity of the infant in the baby stroller and the distance in the front-to-back direction between the front wheel and the above center of gravity are different. Therefore, the operability of the baby stroller is different when the handle is arranged in the back-pushing position and when the handle is arranged in the face-to-face pushing position. For example, in a baby stroller in which the distance in the front-to-back direction between the rear wheel and the above center of gravity is shorter than the distance in the front-to-back direction between the front wheel and the above center of gravity, the operation of the baby stroller becomes difficult when the handle is arranged in the face-to-face pushing position compared to when the handle is arranged in the back-pushing position.

[0005] Technical issues The present invention has been made in consideration of the above circumstances, and an object of the present invention is to improve the operability of the baby stroller in both cases where the handle is arranged in a rear-pushing position and in a face-to-face pushing position.

[0006] Technical Solution One embodiment of the present invention relates to the following [1] to

[12] . [1] A baby stroller having a baby stroller main body, The baby carriage body comprises: a main frame, which includes front legs and rear legs; A handle mounted on the main frame in a manner that allows it to swing in a front-rear direction; a seat support unit held on the main body frame; A front wheel capable of rotating about a front wheel rotation axis extending in a horizontal direction; A front wheel rotation axis holding component connected to the front leg to hold the front wheel rotation axis; a rear wheel rotatable about a rear wheel rotation axis extending in a horizontal direction; and A rear wheel rotation axis holding component is connected to the rear legs to hold the rear wheel rotation axis. The front wheel rotation axis holding member is movable in the front-rear direction relative to the front leg. The rear wheel rotation axis holding member is movable in the front-rear direction relative to the rear leg. [2] The baby stroller according to [1], The stroller body includes a linkage mechanism that moves the front wheel rotation axis holding member in the front-rear direction relative to the front legs and moves the rear wheel rotation axis holding member in the front-rear direction relative to the rear legs according to the swing of the handle. [3] The baby stroller according to [2], The handle can be swung in the front-to-back direction between a rear-side push position and a face-to-face push position, When the handle is located at the back pushing position, the front wheel rotation axis holding component and the rear wheel rotation axis holding component are located at a first position, and when the handle is located at the face-to-face pushing position, the front wheel rotation axis holding component and the rear wheel rotation axis holding component are located at a second position further rearward than the first position. [4] The baby stroller according to [3], The front wheel rotation axis holding member can rotate around the front wheel rotation axis extending in the vertical direction. A distance between the first position and the second position in the front-rear direction is at least twice a distance between the front wheel rotation axis and the front wheel rotation axis in the horizontal direction in a plane perpendicular to the front wheel rotation axis. [5] The stroller body according to any one of [1] to [4] includes a locking member capable of fixing the front wheel rotation axis holding member and the rear wheel rotation axis holding member relative to the front leg and the rear leg, respectively. [6] A baby stroller having a baby stroller body, wherein the baby stroller body has: a main frame, which includes front legs and rear legs; A handle mounted on the main frame in a manner that allows it to swing in a front-rear direction; a seat support unit held on the main body frame; a front wheel rotatable about a front wheel rotation axis extending in a horizontal direction; and The rear wheel is rotatable about a rear wheel rotation axis extending in a horizontal direction, The front legs hold the front wheel rotation axis so as to be movable in the front-rear direction. The rear legs hold the rear wheel rotation axis so as to be movable in the front-rear direction. [7] A baby stroller having a baby stroller main body, The baby carriage body comprises: a main frame, which includes front legs and rear legs; A handle mounted on the main frame in a manner that allows it to swing in a front-rear direction; a seat support unit held on the main body frame; A front wheel mounted on the lower portion of the front leg and rotatable about a front wheel rotation axis extending in a horizontal direction; and The rear wheel is mounted on the lower part of the rear legs and is rotatable about a rear wheel rotation axis extending in the horizontal direction. The front leg includes a front leg upper member forming an upper portion of the front leg and a front leg lower member forming a lower portion of the front leg. The front leg lower member can rotate relative to the front leg upper member around the front leg rotation axis along the vertical direction. The hind leg includes an upper hind leg member constituting an upper portion of the hind leg and a lower hind leg member constituting a lower portion of the hind leg. The rear leg lower member can rotate relative to the rear leg upper member about the rear leg rotation axis in the vertical direction. By rotating the front leg lower member relative to the front leg upper member, the position of the front wheel relative to the seat support unit in the front-rear direction is changed. By rotating the rear leg lower member relative to the rear leg upper member, the position of the rear wheel relative to the seat support unit in the front-rear direction is changed. [8] According to the stroller described in [7], the front leg rotation axis passes through the front leg upper member, The front leg lower member is connected to the front leg upper member at the radial outer side of a circle centered on the front leg rotation axis. The rear leg rotation axis passes through the rear leg upper member, The rear leg lower member is connected to the rear leg upper member at a radially outer side of a circle centered on the rear leg rotation axis. [9] According to the stroller described in [7] or [8], the front leg lower member and the rear leg lower member are inclined with respect to the vertical direction.

[10] According to any one of [7] to [9], the stroller body includes a linkage mechanism, which causes the front leg lower member to rotate relative to the front leg upper member and the rear leg lower member to rotate relative to the rear leg upper member according to the swing of the handle.

[11] According to the stroller described in

[10] , the handle can be swung in the front-to-back direction between a back-pushing position and a face-to-face pushing position. When the handle is located at the back pushing position, the front wheel and the rear wheel are located at a third position, and when the handle is located at the face-to-face pushing position, the front wheel and the rear wheel are located at a fourth position further rearward than the third position.

[12] According to the stroller described in [7] to

[11] , the stroller body includes a locking component, which can fix the front leg lower member and the rear leg lower member relative to the front leg upper member and the rear leg upper member respectively.

[0019] According to the present invention, the operability of the baby stroller can be improved both when the handle is arranged at the back-pushing position and when the handle is arranged at the face-to-face pushing position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a diagram for explaining the first embodiment of the present invention and is a perspective view for explaining the overall structure of the baby stroller.

[0021] Figure 2 The handle is shown in the state of being configured in the back push position Figure 1 view of a baby stroller.

[0022] Figure 3 The handle is shown in the state where it is arranged in the face-to-face push position. Figure 1 view of a baby stroller.

[0023] Figure 4 The folded state is shown Figure 1 view of a baby stroller.

[0024] Figure 5 is a diagram for explaining a modified example of the first embodiment, and is similar to Figure 2 The corresponding figure.

[0025] Figure 6It is a diagram for explaining a second embodiment of the present invention, and is a side view showing a baby stroller in a state where the handle is arranged at a rear push position.

[0026] Figure 7 The handle is shown in the state where it is arranged in the face-to-face push position. Figure 6 view of a baby stroller.

[0027] Explanation of symbols 10 Baby carriage 11Baby stroller body 12 Main frame 14 front legs 141 Front leg upper member 142 front leg lower member 16. Hind legs 161 Rear leg upper member 162 lower hind leg member 18Front wheel 18b Front wheel rotation axis 18c Front wheel rotation shaft holding component 19 rear wheel 19b Rear wheel rotation axis 19c Rear wheel rotation axis holding component 20 axis components 30 handles 32 handle extension 40 Seat support unit 41 seat support 45 back support 70, 170 linkage mechanism 71, 171 traction parts 72, 172 force-applying components L1 first connecting rod component L2 Second connecting rod component L3 third connecting rod component L4 Fourth connecting rod component DETAILED DESCRIPTION

[0028] <<First Embodiment>> Hereinafter, a first embodiment of the present invention will be described with reference to a specific example shown in the drawings.

[0029] Figures 1 to 4 FIG. 1 is a diagram for explaining a first embodiment of the baby carriage of the present invention. Figures 1 to 4 The overall structure of a specific example of a baby stroller is shown in FIG.

[0030] The baby carriage 10 of this embodiment includes a baby carriage body 11. Figure 1As shown, the baby carriage body 11 shown in the figure has a generally symmetrical structure with the plane along the front-back direction and the up-down direction as the center. The baby carriage body 11 has: a main frame 12, which has front legs 14 and rear legs 16; a handle 30, which is mounted on the main frame 12; and a seat support unit 40, which is supported by the main frame 12.

[0031] The handle 30 can be swung in the front-rear direction relative to the main frame 12. The handle 30 can be positioned Figure 2 The rear push position shown is the same as Figure 3 When the handle 30 is arranged in the rear push position, the operator (guardian) holds the handle 30 from the rear side of the infant to operate the stroller 10. At this time, the front leg 14 side of the stroller 10 is the front in the travel direction. When the handle 30 is arranged in the rear push position, the operator holds the handle 30 from the side facing the infant to operate the stroller 10. At this time, the rear leg 16 side of the stroller 10 is the front in the travel direction.

[0032] The seat support unit 40 supports a seat cushion on which an infant sitting in the baby carriage 10 sits. The seat support unit 40 supports the infant sitting in the baby carriage body 11 from below via the seat cushion.

[0033] In addition, in this specification, unless otherwise specified, the terms "front", "rear", "up", "down", "front-rear direction", and "up-down direction" with respect to the stroller and its components refer to the "front", "rear", "up", "down", "front-rear direction", and "up-down direction" based on the stroller in the unfolded state and the infant or young child riding in the components. More specifically, the "front-rear direction" refers to the direction connecting the stroller and the components. Figure 1 The lower left and upper right directions of the paper are equivalent to Figure 2 and Figure 3 In addition, unless otherwise specified, "front" means the side that the infant or toddler is facing. Figure 1 The lower left side of the paper and Figure 2 and Figure 3 The left side of the paper is the front side. On the other hand, the "up and down direction" refers to the direction perpendicular to the travel surface of the baby carriage. Therefore, when the travel surface is a horizontal plane, the "up and down direction" refers to the vertical direction. In addition, the "lateral" refers to the width direction, which is a direction perpendicular to both the "front and rear direction" and the "up and down direction". Moreover, the "back side" refers to the side opposite to the side facing the infant riding in the baby carriage 10. Therefore, the "back side" is usually the back side.

[0034] In the present specification, the widthwise inner side refers to a side closer to the center of the stroller body 11 in the widthwise direction. On the other hand, the widthwise outer side refers to a side farther from the center of the stroller body 11 in the widthwise direction.

[0035] exist Figures 1 to 4 In the specific example shown, the stroller body 11 is foldable. Hereinafter, each member constituting the stroller body 11 will be described in further detail.

[0036] (Main frame) like Figure 1 As shown, the main frame 12 has a pair of front legs 14 respectively arranged on the left and right, and a pair of rear legs 16 respectively arranged on the left and right. The main frame 12 also has a first link component L1, a second link component L2, a third link component L3, and a fourth link component L4 respectively arranged on the left and right. The front legs 14, the rear legs 16, and the first link component L1 to the fourth link component L4 function as link components that make the main frame 12 foldable and unfoldable. In the example shown in the figure, the first link component L1 also functions as an armrest. That is, the first link component L1 is composed of an armrest.

[0037] A front wheel 18 is rotatably provided at the lower end of the front leg 14, and a rear wheel 19 is rotatably provided at the lower end of the rear leg 16. The front wheel 18 can rotate around a front wheel rotation axis 18b extending in the horizontal direction. The front wheel rotation axis 18b is held by a front wheel rotation axis holding member 18c connected to the front leg 14. The front wheel rotation axis holding member 18c is connected to the front leg 14 in a manner that it can rotate around a front wheel rotation axis 18d extending in the vertical direction. In this way, the front wheel rotation axis holding member 18c and the front wheel 18 constitute a caster. In addition, the rear wheel 19 can rotate around a rear wheel rotation axis 19b extending in the horizontal direction. The rear wheel rotation axis 19b is held by a rear wheel rotation axis holding member 19c connected to the rear leg 16. The rear wheel rotation axis holding member 19c is connected to the rear leg 16 in a manner that it can rotate around a rear wheel rotation axis 19d extending in the vertical direction. In this way, the rear wheel rotation axis holding member 19c and the rear wheel 19 constitute a caster. The front legs 14 and the rear legs 16 will be described in detail later.

[0038] like Figure 2 As shown, the upper end of the front leg 14 is connected to the front part of the first link member L1 arranged on the opposite side (left or right) in a rotatable (swingable) manner. The upper end of the rear leg 16 is connected to the front part of the first link member L1 arranged on the opposite side (left or right) in a rotatable (swingable) manner. Figure 1As shown, the upper portion of the second link member L2 is rotatably (swingably) connected to the rear portion of the first link member L1 disposed on the opposite side (left or right). The second link member L2 is supported by the rear legs 16 when the main frame 12 is deployed.

[0039] The third link component L3 is disposed between the front leg 14 and the second link component L2. The third link component L3 is connected to the middle portion of the front leg 14 at its front portion. The third link component L3 can rotate relative to the front leg 14 around a rotation axis extending in the width direction. Moreover, the third link component L3 is connected to the lower portion of the second link component L2 at its rear portion. The third link component L3 can rotate relative to the second link component L2 around a rotation axis extending in the width direction.

[0040] like Figure 2 and Figure 3 As shown, the third link member L3 is connected to the second link member L2 via the shaft member 20 extending in the width direction. In addition, the third link member L3 is connected to the front leg 14 via a shaft member (not shown) extending in the width direction. Therefore, the pair of third link members L3 rotate synchronously with each other relative to the front leg 14 and the second link member L2.

[0041] like Figure 1 As shown, in the example shown in the figure, the fourth link member L4 is connected to the rear leg 16 in a rotatable manner. The fourth link member L4 is connected to the middle part of the rear leg 16 in a rotatable manner at its lower part. The fourth link member L4 is rotatably connected to the second link member L2 and the third link member L3. In the example shown in the figure, the second link member L2, the third link member L3 and the fourth link member L4 are rotatably connected to each other using the same shaft member 20. The shaft member 20 penetrates the second link member L2, the fourth link member L4 and the third link member L3. According to this structure, the second link member L2, the third link member L3 and the fourth link member L4 can rotate with each other around an axis that coincides with the central axis of the shaft member 20.

[0042] In addition, if Figure 1 As shown, the main frame 12 has 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 as components extending in the lateral direction. The front connecting member 15 functions as a footrest. In addition, a central connecting member 21 is provided between a pair of third link members L3. The front connecting member 15, the rear connecting member 17 and the central connecting member 21 can suppress lateral deformation of the baby carriage 10.

[0043] (handle) As described above, the handle 30 can swing forward and backward relative to the main frame 12. The handle 30 can be pushed in the rear position (refer to Figure 2 ) and face-to-face push position (reference Figure 3 ). In the example shown in the figure, the handle 30 is tilted relative to the vertical direction and extends backward in the back push position. The handle 30 is tilted relative to the vertical direction and extends forward in the face-to-face push position.

[0044] In the example shown in the figure, the handle 30 includes a handle body 31 swingably mounted on the main body frame 12 and a holding body 35 provided on the handle body 31 .

[0045] like Figure 1 As shown, the handle body 31 has a generally U-shaped shape. The handle body 31 is connected to the main frame 12 at both ends of the U-shape in a rotatable (swingable) manner. The handle body 31 includes a pair of handle extensions 32 extending approximately parallel to each other and an intermediate portion 33 connecting the pair of handle extensions 32. The pair of handle extensions 32 are arranged on the outer sides of the main frame 12 in the width direction. Each handle extension 32 is connected to the main frame 12 in a rotatable manner at its lower end. The intermediate portion 33 is a gripping portion for the operator (guardian) to grip.

[0046] In the example shown in the figure, the handle body 31 is rotatably connected to the main frame 12 using the shaft member 20. That is, the second link member L2, the third link member L3, the fourth link member L4 and the handle 30 can rotate relative to each other around the same axis divided by the shaft member 20. Figure 3 ) is engaged, thereby being able to maintain the handle 30 in Figure 2 By connecting the holding body 35 provided on the handle 30 with the second holding member 37 (refer to Figure 2 ) is engaged, thereby being able to maintain the handle 30 in Figure 3 Face-to-face push position shown.

[0047] The stroller body 11 having the above structure can be folded by relatively rotating the components. Specifically, the second link member L2 is temporarily lifted upward and backward using the handle 30 disposed at the rear push position, and then pressed downward to move the fourth link member L4 relative to the rear leg 16. Figure 2 With this operation, the first link member L1 and the third link member L3 are relative to the second link member L2. Figure 2By such operation, when viewed from the side, the second link member L2 and the front leg 14 approach each other while maintaining a substantially parallel configuration, and the position of the handle 30 relative to the main frame 12 is lowered. Figure 4 As shown, the stroller body 11 can be folded. Figure 4 In the folded state, the dimensions of the stroller 10 in the front-rear direction and the up-down direction can be reduced. On the other hand, in order to unfold the stroller body 11 from the folded state, it is only necessary to follow the steps opposite to the above-mentioned folding operation.

[0048] It should be noted that the stroller body 11 has a state maintaining mechanism (not shown) that limits the relative rotation of the two components. By operating the state maintaining mechanism, the stroller body 11 can be folded. In the example shown in the figure, the handle 30 has a remote control device 38 connected to the state maintaining mechanism. Figure 1 As shown, the remote control device 38 is provided in the middle portion 33 of the handle body 31. By operating the remote control device 38, the state maintaining mechanism can be operated, so that the stroller body 11 can be folded.

[0049] (Seat support unit) The seat support unit 40 supports a seat cushion (not shown) on which an infant sits. Figure 1 As shown in FIG. 1 , the seat support unit 40 includes a seat support body 41 and a back support body 45. The seat support body 41 is opposite to the buttocks of the infant riding in the baby carriage 10. The back support body 45 is opposite to the back of the infant. Figure 1 As shown, the seat support unit 40 is arranged inside the width direction of the main frame 12. More specifically, the seat support unit 40 is arranged between the left and right front legs 14 and rear legs 16.

[0050] The seat support body 41 has a front frame member 42. The front frame member 42 is a frame member formed in a substantially U-shape. The seat support body 41 includes a fabric (not shown) which is stretched on the front frame member 42 and constitutes a seat surface. Alternatively, the seat support body 41 includes a seat plate (not shown) which is supported from below by the front frame member 42 and constitutes a seat surface. The seat plate is a plate-shaped member formed using resin and / or metal. It should be noted that when the seat support body 41 includes a seat plate, the seat support body 41 may not include the front frame member 42.

[0051] In the example shown in the figure, the seat support body 41 is held by the third link member L3. Thus, when the stroller body 11 is folded, the seat support body 41 can be rotated along with the rotation of the third link member L3. When the stroller body 11 is folded, the angle of the seat support body 41 relative to the second link member L2 can be automatically reduced, thereby reducing the front-to-back dimension of the stroller 10 in the folded state. In other words, when the stroller 10 in the folded state is viewed from the side, the seat support body 41 can be prevented from protruding further forward than the main frame 12.

[0052] The back support body 45 has a rear frame member 46. The rear frame member 46 is a frame member formed in a substantially U-shape. In the illustrated example, the back support body 45 is connected to the seat support body 41. More specifically, the rear frame member 46 extends upward or rearward from the rear end portion of the front frame member 42. The front end portion of the rear frame member 46 is rotatably connected to the rear end portion of the front frame member 42 around a rotation axis extending in the width direction. The rotation axis passes through a connection portion A (hereinafter also referred to as a "back seat connection portion A") between the back support body 45 and the seat support body 41. By rotating the back support body 45 relative to the seat support body 41, the back support body 45 can be tilted relative to the seat support body 41. The back support body 45 can also have a cloth-like member or a plate-like member supported by the rear frame member 46.

[0053] The back support body 45 is supported from behind by an inclined belt 49 whose ends are connected to the main frame 12. This prevents the back support body 45 from falling backward. The length of the inclined belt 49 is variable. By adjusting the length of the inclined belt 49, the back support body 45 can be tilted. It should be noted that the inclined belt 49 is only Figure 2 and Figure 3 In Figure 1 and Figure 4 In the figure, the inclined belt 49 is omitted.

[0054] In the example shown in the figure, both ends of the inclined belt 49 are connected to the first link member L1. The inclined belt 49 is arranged at the back side of the back support body 45 at its central part, and is connected to the first link member L1 at both ends, so that when the main frame 12 is folded, the back support body 45 can be rotated relative to the second link member L2 as the first link member L1 rotates. When the baby carriage 10 is folded, the angle of the back support body 45 relative to the second link member L2 can be automatically reduced, and the dimension of the baby carriage 10 in the front-rear direction in the folded state can be reduced. In other words, in a side view of the baby carriage 10 in the folded state, the back support body 45 can be prevented from protruding further to the rear than the second link member L2.

[0055] The seat support unit 40 includes a pair of side support portions 50 and a side frame member 51 extending in the vertical direction. The side support portion 50 extends upward from the front frame member 42. The side frame member 51 is a frame member formed in a substantially U-shape. The side frame member 51 is connected to the upper end of the side support portion 50 at both ends of the U-shape. The side frame member 51 is connected to the side support portion 50 so as to be rotatable around a rotation axis parallel to the width direction.

[0056] A connecting frame member 52 is provided between the middle portion of the side frame member 51 and the middle portion of the rear frame member 46. The connecting frame member 52 can rotate relative to the rear frame member 46 and the side frame member 51. The connecting frame member 52 swings along with the swing of one of the rear frame member 46 and the side frame member 51. In addition, the connecting frame member 52 is formed between the rear portion of the rear frame member 46 and the rear portion of the side frame member 51, and forms a wall portion located behind the head of an infant when the back support body 45 is laid flat, and forms a wall portion located behind the head of an infant when the back support body 45 is erected.

[0057] In addition, the seat support unit 40 has a pair of protective component support bodies 54 connected to the left and right sides of the seat support body 41, and a protective component 55 extending between the pair of protective component support bodies 54. The left and right ends of the protective component 55 are detachably connected to the left and right protective component support bodies 54, respectively. In addition, the seat support unit 40 has a canopy support body 57 that supports a canopy cloth (not shown). The canopy support body 57 includes: a pair of canopy support parts 58 respectively fixed to the two ends of the side frame part 51, and a canopy frame 59 extending between the pair of canopy support parts 58. A canopy cloth is installed on the canopy frame 59 to form a canopy. The canopy covers the infant sitting on the seat support unit 40 from above, providing a sunshade environment for the infant.

[0058] (front and hind legs) In the illustrated example, the front leg 14 has a front leg main component 14a connected to the first link component L1 and a front wheel holding component 14b connected to the front leg main component 14a. The front leg main component 14a is connected to the first link component L1 at its upper end. The front leg main component 14a can be formed using, for example, a metal and / or resin pipe. The front wheel holding component 14b is formed as an extension of the front leg main component 14a. The front wheel holding component 14b is connected to the lower end of the front leg main component 14a. The front wheel holding component 14b is connected to the front leg main component 14a at its upper end. The front wheel holding component 14b holds the front wheel rotating shaft holding component 18c at its lower end.

[0059] In addition, in the example shown in the figure, the rear leg 16 has a rear leg main component 16a connected to the first link component L1 and a rear wheel holding component 16b connected to the rear leg main component 16a. The rear leg main component 16a is connected to the first link component L1 at its upper end. The rear leg main component 16a can be formed using, for example, a metal and / or resin pipe. The rear wheel holding component 16b is formed as an extension of the rear leg main component 16a. The rear wheel holding component 16b is connected to the lower end of the rear leg main component 16a. The rear wheel holding component 16b is connected to the rear leg main component 16a at its upper end. The rear wheel holding component 16b holds the rear wheel rotating shaft holding component 19c at its lower end.

[0060] In addition, the baby carriage 10 of this embodiment is designed to improve the operability of the baby carriage 10 in both cases where the handle 30 is arranged in the rear push position and the handle 30 is arranged in the face-to-face push position. Specifically, the front wheel rotation axis holding member 18c is movable in the front-to-back direction relative to the front legs 14. In addition, the rear wheel rotation axis holding member 19c is movable in the front-to-back direction relative to the rear legs 16.

[0061] Here, when the operator of the stroller 10 operates the stroller 10 with the handle 30 disposed in the back-pushing position, the stroller 10 is operated with the rear wheel rotation shaft 19b as a fulcrum. On the other hand, when the operator of the stroller 10 operates the stroller 10 with the handle 30 disposed in the face-to-face pushing position, the stroller 10 is operated with the front wheel rotation shaft 18b as a fulcrum. The shorter the distance in the front-to-back direction between the fulcrum and the center of gravity of the infant on the seat support unit 40, the higher the operability of the stroller 10. The position in the front-to-back direction of the center of gravity of the infant in the main frame 12 is substantially consistent with the position in the front-to-back direction of the back seat connection portion A in the main frame 12. Therefore, the shorter the distance in the front-to-back direction between the fulcrum and the back seat connection portion A, the higher the operability of the stroller 10.

[0062] However, if the distance in the front-to-back direction between the rear wheel rotation axis 19b and the back seat connection portion A is shortened, the operability of the stroller 10 when the handle 30 is arranged in the back push position can be improved, but the operability of the stroller 10 when the handle 30 is arranged in the face-to-face push position is impaired. On the other hand, if the distance in the front-to-back direction between the front wheel rotation axis 18b and the back seat connection portion A is shortened, the operability of the stroller 10 when the handle 30 is arranged in the face-to-face push position can be improved, but the operability of the stroller 10 when the handle 30 is arranged in the back push position is impaired.

[0063] In the present embodiment, by moving the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c (therefore, the front wheel rotation axis 18b and the rear wheel rotation axis 19b) in the front-to-rear direction relative to the front legs 14 and the rear legs 16 (therefore, relative to the back seat connection part A), respectively, the stroller 10 can be well operated regardless of whether the handle 30 is configured in the back push position or the face-to-face push position.

[0064] In the example shown in the figure, the handle 30 is arranged at Figure 2 In the case of the back push position shown in the figure, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are arranged in the first position. At this time, the distance between the rear wheel rotation axis 19b and the back seat connection part A in the front-to-back direction is set to D1, and the distance between the front wheel rotation axis 18b and the back seat connection part A in the front-to-back direction is set to D2. In the example shown in the figure, the distance D1 is shorter than the distance D2. Therefore, when the handle 30 is arranged in the Figure 3 In the face-to-face pushing position shown in the figure, the front wheel rotating shaft retaining component 18c and the rear wheel rotating shaft retaining component 19c are arranged in a second position which is further rearward than the first position. In this case, the distance in the front-to-back direction between the front wheel rotating shaft 18b and the back seat connecting part A is set to D3. Since the second position is further rearward than the first position, the distance D3 is shorter than the distance D2. Therefore, compared with the existing baby stroller in which the front wheel rotating shaft retaining component 18c and the rear wheel rotating shaft retaining component 19c cannot move relative to the front legs 14 and the rear legs 16, the operability of the baby stroller 10 when the handle 30 is arranged in the face-to-face pushing position is improved. In addition, since the distance D1 is shorter than the distance D2, the operability of the baby stroller 10 when the handle 30 is arranged in the back pushing position is also good. Figure 3 In FIG. 1 , the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c located at the first position are indicated by two-dot chain lines.

[0065] Furthermore, by moving not only the front wheel 18 relative to the front leg 14 but also the rear wheel 19 relative to the rear leg 16, the change in the distance between the front wheel 18 and the rear wheel 19 in the front-rear direction is suppressed. Therefore, even if the front wheel 18 is moved, the possibility of the stability of the baby carriage 10 being impaired can be suppressed. In the example shown in the figure, the moving distance of the front wheel rotation axis holding member 18c from the first position to the second position is equal to the moving distance of the rear wheel rotation axis holding member 19c from the first position to the second position.

[0066] In the example shown in the figure, the front wheel rotation axis holding member 18c is connected to the lower end of the front wheel holding member 14b. The lower end of the front wheel holding member 14b extends further rearward than the lower end of the front leg main member 14a. The lower end of the front wheel holding member 14b holds the front wheel rotation axis holding member 18c so that it can move in the front-back direction. The front wheel rotation axis holding member 18c can be in the first position (refer to Figure 2 ) and a second position further back than the first position (refer to Figure 3 In the example shown in the figure, the front wheel holding member 14b also holds the front wheel rotation axis holding member 18c in a manner that allows rotation around the front wheel rotation axis 18d.

[0067] In the example shown in the figure, the distance D4 between the first position and the second position in the front-rear direction (see Figure 3 ) is determined as follows. That is, the distance D4 is determined as the distance D5 (refer to Figure 3 ), the distance D5 is the horizontal distance between the front wheel rotation axis 18d and the front wheel rotation axis 18b in a plane perpendicular to the front wheel rotation axis 18b. Here, when the front wheel rotation axis holding member 18c rotates around the front wheel rotation axis 18d, as shown in FIG. Figure 2 and Figure 3 As shown, the position of the front wheel rotation axis 18b relative to the front wheel rotation axis 18d changes when the handle 30 is arranged in the back push position to operate the baby stroller 10 and when the handle 30 is arranged in the face-to-face push position to operate the baby stroller 10. In the example shown in the figure, when the handle 30 is arranged in the back push position to operate the baby stroller 10, the front wheel rotation axis 18b is located at a position the distance D5 behind the front wheel rotation axis 18d. In contrast, when the handle 30 is arranged in the face-to-face push position to operate the baby stroller 10, the front wheel rotation axis 18b is located at a position the distance D5 in front of the front wheel rotation axis 18d. Therefore, when the handle 30 is moved from the back push position to the face-to-face push position, even if the front wheel rotation axis retaining component 18c is moved a distance D4, the movement distance of the front wheel rotation axis 18b becomes D4-2×D5. Therefore, by setting the distance D4 to be more than twice the distance D5, the distance D3 (refer to Figure 3 ) is set to distance D2 (refer to Figure 2 ) below, it is possible to suppress the deterioration in operability of the stroller 10 caused by the rotation of the front wheel 18.

[0068] More preferably, the distance D4 is greater than twice the distance D5. Figure 3 ) is less than the distance D2 (reference Figure 2 ), thereby improving the operability of the stroller 10 when the handle 30 is arranged in the face-to-face pushing position.

[0069] It should be noted that the distance D4 is measured as the distance between the rotation axis of the front wheel rotation axis holding member 18c arranged at the first position and the rotation axis of the front wheel rotation axis holding member 18c arranged at the second position. Alternatively, the distance D4 is measured as the distance between the rotation axis of the rear wheel rotation axis holding member 19c arranged at the first position and the rotation axis of the rear wheel rotation axis holding member 19c arranged at the second position. In addition, the distance D5 is measured as the distance in the horizontal direction between the rotation axis of the front wheel rotation axis holding member 18c and the rotation axis of the front wheel 18. The rotation axis of the front wheel rotation axis holding member 18c coincides with the central axis of the front wheel rotation axis 18d. The rotation axis of the rear wheel rotation axis holding member 19c coincides with the central axis of the rear wheel rotation axis 19d. The rotation axis of the front wheel 18 coincides with the central axis of the front wheel rotation axis 18b.

[0070] In the illustrated example, the stroller body 11 includes a linkage mechanism 70, and the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are moved in conjunction with the swing of the handle 30. The linkage mechanism 70 will be described below.

[0071] (Linkage Agency) The linkage mechanism 70 moves the front wheel rotation axis holding member 18c in the front-to-rear direction relative to the front legs 14 and moves the rear wheel rotation axis holding member 19c in the front-to-rear direction relative to the rear legs 16 according to the swinging of the handle 30. If the handle 30 is arranged in the back push position, the linkage mechanism 70 positions the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c in the first position, and if the handle 30 is arranged in the face-to-face push position, the linkage mechanism 70 positions the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c in the second position. When the stroller body 11 has the linkage mechanism 70, the front wheel rotation axis holding member 18c in the front-to-rear direction relative to the front legs 14 and the rear wheel rotation axis holding member 19c in the front-to-rear direction relative to the rear legs 16 can be automatically changed by swinging the handle 30.

[0072] In the example shown in the figure, the linkage mechanism 70 includes a traction member 71 and a force member 72. The traction member 71 may be a soft and elongated member. The traction member 71 may be a line, a rope, a chain, etc. The traction member 71 connects the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c to the handle 30. If the handle 30 is configured in the back push position, the traction member 71 pulls the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c from the second position to the first position. The force member 72 applies force to the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c from the first position to the second position. It should be noted that if the swing of the handle 30 is configured in the face-to-face push position, the traction member 71 is relaxed and does not apply traction to the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c.

[0073] In the stroller 10 having such a linkage mechanism 70, when the handle 30 is arranged in the back push position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are arranged in the first position due to the traction force of the traction member 71. Then, when the handle 30 is swung from the back push position to the face-to-face push position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are moved from the first position to the second position due to the urging force of the urging member 72. While the handle 30 is arranged in the face-to-face push position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are kept in the second position due to the urging force of the urging member 72. When the handle 30 is swung from the face-to-face push position to the back push position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are moved from the second position to the first position due to the urging force of the traction member 71.

[0074] Of course, if the handle 30 is placed in the face-to-face pushing position, the traction member 71 may also pull the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c from the first position to the second position. In this case, the force applying member 72 may apply force to the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c from the second position to the first position. In such a linkage mechanism 70, when the handle 30 is placed in the back pushing position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are placed in the first position due to the force of the force applying member 72. And, if the handle 30 is swung from the back pushing position to the face-to-face pushing position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c move from the first position to the second position due to the traction force of the traction member 71. While the handle 30 is placed in the face-to-face pushing position, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c stay in the second position due to the traction force of the traction member 71. When the handle 30 is swung from the face-to-face pushing position to the rear-face pushing position, the front wheel rotation axis holding member 18 c and the rear wheel rotation axis holding member 19 c are moved from the second position to the first position by the urging force of the urging member 72 .

[0075] <<Modification of the first embodiment>> Next, various modifications of the first embodiment will be described.

[0076] <Variation 1-1> In the above example, the stroller body 11 includes the linkage mechanism 70, and the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are moved in conjunction with the swing of the handle 30 through the linkage mechanism 70, but the present invention is not limited thereto. The front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c may also be moved manually relative to the front leg 14 and the rear leg 16.

[0077] <Variation 1-2> In the above example, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are held in the first position or the second position by the linkage mechanism 70, but the present invention is not limited thereto. The front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c may also be held in the first position or the second position by the locking member 75. The locking member 75 may fix the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c relative to the front leg 14 and the rear leg 16, respectively.

[0078] exist Figure 5 In the example shown, the locking member 75 is mounted on the front wheel holding member 14b and the rear wheel holding member 16b. The locking member 75 can move in the vertical direction relative to the front wheel holding member 14b and the rear wheel holding member 16b. Figure 5 The cam moves between the locked position shown in the figure and the unlocked position which is above the locked position. Figure 5 In the locked position shown, the locking member 75 interferes with the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c and restricts their front-to-back movement. Therefore, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c are held in the first position or the second position. In the unlocked position, the locking member 75 does not interfere with the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c and allows their front-to-back movement. Therefore, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c can move between the first position and the second position.

[0079] <Variation 1-3> In the above example, the front wheel rotation axis holding member 18c can rotate around the front wheel rotation axis 18d, and the rear wheel rotation axis holding member 19c can rotate around the rear wheel rotation axis 19d, but the present invention is not limited thereto. The front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c may not rotate. In other words, the front wheel rotation axis holding member 18c and the front wheel 18, and the rear wheel rotation axis holding member 19c and the rear wheel 19 may not constitute casters.

[0080] <Variation 1-4> In the above example, the front wheel rotation shaft 18b is held by the front wheel rotation shaft holding member 18c, and the rear wheel rotation shaft 19b is held by the rear wheel rotation shaft holding member 19c, but the present invention is not limited thereto. The front wheel rotation shaft 18b may be directly held by the front leg 14, and the rear wheel rotation shaft 19b may be directly held by the rear leg 16. For example, the front wheel holding member 14b may hold the front wheel rotation shaft 18b so as to be movable in the front-rear direction, and the rear wheel holding member 16b may hold the rear wheel rotation shaft 19b so as to be movable in the front-rear direction.

[0081] <<Second Embodiment>> Next, refer to Figure 6 and Figure 7 , a baby carriage 110 according to a second embodiment will be described. Figure 6 Corresponds to Figure 2 , Figure 7 Corresponds to Figure 3 , Figure 6 and Figure 7 It is a side view of the baby carriage 110 according to the second embodiment.

[0082] exist Figure 6 and Figure 7 In the example shown, Figures 1 to 4Compared with the stroller 10 shown in the figure, the lower part of the front leg 14 is rotatable relative to the upper part of the front leg 14, and the lower part of the rear leg 16 is rotatable relative to the upper part of the rear leg 16. In addition, the front wheel rotation axis holding member 18c is not movable in the front-to-back direction relative to the lower part of the front leg 14, and the rear wheel rotation axis holding member 19c is not movable in the front-to-back direction relative to the lower part of the rear leg 16. Other structures are different Figures 1 to 4 The stroller 10 shown is substantially the same. Figure 6 and Figure 7 In the example shown, Figures 1 to 4 The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0083] (front and hind legs) The front leg 14 includes a front leg upper member 141 forming the upper part of the front leg 14 and a front leg lower member 142 forming the lower part of the front leg 14. The upper end of the front leg upper member 141 is connected to the front part of the first link member L1 in a rotatable manner. The upper end of the front leg lower member 142 is connected to the lower end of the front leg upper member 141. The front leg lower member 142 can rotate relative to the front leg upper member 141 around the front leg rotation axis X14 along the vertical direction. The front wheel rotation axis holding member 18c is connected to the lower end of the front leg lower member 142. The front wheel rotation axis holding member 18c and the front wheel 18 do not have to constitute a caster. In other words, the front wheel rotation axis holding member 18c can be non-rotatable relative to the front leg lower member 142.

[0084] The rear leg 16 includes a rear leg upper member 161 forming the upper part of the rear leg 16 and a rear leg lower member 162 forming the lower part of the rear leg 16. The upper end of the rear leg upper member 161 is connected to the front part of the first link member L1 in a rotatable manner. The upper end of the rear leg lower member 162 is connected to the lower end of the rear leg upper member 161. The rear leg lower member 162 can rotate relative to the rear leg upper member 161 around the rear leg rotation axis X16 along the vertical direction. The rear wheel rotation axis holding member 19c is connected to the lower end of the rear leg lower member 162. The rear wheel rotation axis holding member 19c and the rear wheel 19 may not constitute a caster. In other words, the rear wheel rotation axis holding member 19c may not rotate relative to the rear leg lower member 162.

[0085] In the example shown in the figure, by rotating the front leg lower member 142 relative to the front leg upper member 141 and rotating the rear leg lower member 162 relative to the rear leg upper member 161, the front wheels 18 and the rear wheels 19 (thus, the front wheel rotation axis 18b and the rear wheel rotation axis 19b) can be moved in the front-rear direction relative to the back seat connection portion A. Thus, the baby carriage 10 can be operated well regardless of whether the handle 30 is arranged in the back push position or the face-to-face push position.

[0086] Specifically, the front leg upper member 141 and the front leg lower member 142 are connected via the front leg connecting member 143. The front leg connecting member 143 can rotate around the front leg rotation axis X14 relative to the front leg upper member 141. The front leg rotation axis X14 passes through the lower end of the front leg upper member 141. The front leg lower member 142 is fixed to the front leg connecting member 143. The connection position between the front leg connecting member 143 and the front leg lower member 142 is offset in the radial direction of a circle centered on the front leg rotation axis X14 relative to the connection position between the front leg connecting member 143 and the front leg upper member 141. Thus, if the front leg lower member 142 is rotated relative to the front leg upper member 141, the position of the front wheel 18 mounted on the front leg lower member 142 in the front-back direction changes. In addition, the front leg lower member 142 is inclined relative to the vertical direction. Thus, the position of the front wheel 18 in the front-back direction also changes according to the rotation of the front leg lower member 142 relative to the front leg upper member 141.

[0087] In addition, the rear leg upper member 161 and the rear leg lower member 162 are connected via the rear leg connecting member 163. The rear leg connecting member 163 can rotate around the rear leg rotation axis X16 relative to the rear leg upper member 161. The rear leg rotation axis X16 passes through the lower end of the rear leg upper member 161. The rear leg lower member 162 is fixed to the rear leg connecting member 163. The connection position between the rear leg connecting member 163 and the rear leg lower member 162 is offset radially from the circle centered on the rear leg rotation axis X16 relative to the connection position between the rear leg connecting member 163 and the rear leg upper member 161. Thus, if the rear leg lower member 162 is rotated relative to the rear leg upper member 161, the position of the rear wheel 19 mounted on the rear leg lower member 162 in the front-to-back direction changes. In addition, the rear leg lower member 162 is inclined relative to the vertical direction. Thus, the position of the rear wheel 19 in the front-to-back direction also changes according to the rotation of the rear leg lower member 162 relative to the rear leg upper member 161.

[0088] In the example shown in the figure, the handle 30 is arranged at Figure 6 In the case of the back push position shown in FIG. 1 , the front wheel 18 and the rear wheel 19 are arranged in the third position. Figure 7In the face-to-face pushing position shown in FIG. 1 , the front wheel 18 and the rear wheel 19 are arranged at a fourth position further rearward than the third position. Since the fourth position is located further rearward than the third position, the distance D7 in the front-to-back direction between the front wheel rotation axis 18b and the back seat connection portion A when the handle 30 is arranged at the face-to-face pushing position (see FIG. Figure 7 ) is greater than the distance D6 in the front-to-back direction between the front wheel rotation axis 18b and the back seat connection portion A when the handle 30 is arranged in the back push position (refer to Figure 6 )short.

[0089] Next, the front wheel 18 and the rear wheel 19 are arranged on Figure 6 The position of the front leg lower member 142 and the rear leg lower member 162 at the third position shown in FIG. 1 is referred to as the fifth position. Figure 7 The position of the front leg lower member 142 and the rear leg lower member 162 in the fourth position shown is referred to as the sixth position.

[0090] In the example shown in the figure, Figure 6 As shown, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the fifth position, the upper ends of the front leg lower member 142 and the rear leg lower member 162 are located in front of the lower ends of the front leg upper member 141 and the rear leg upper member 161. Figure 7 As shown, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the sixth position, the upper ends of the front leg lower member 142 and the rear leg lower member 162 are located rearward of the lower ends of the front leg upper member 141 and the rear leg upper member 161 .

[0091] In addition, in the example shown in the figure, Figure 6 As shown, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the fifth position, the front leg lower member 142 and the rear leg lower member 162 are inclined with respect to the vertical direction in a manner facing forward and downward. Figure 7 As shown, when the front leg lower member 142 and the rear leg lower member 162 are arranged in the sixth position, the front leg lower member 142 and the rear leg lower member 162 are inclined with respect to the vertical direction so as to face rearward and downward.

[0092] In the illustrated example, the stroller body 111 of the stroller 110 includes a linkage mechanism 170, through which the rotation of the front leg lower member 142 and the rear leg lower member 162 is linked to the swing of the handle 30. The linkage mechanism 170 will be described below.

[0093] (Linkage Agency) The linkage mechanism 170 rotates the front leg lower member 142 relative to the front leg upper member 141 and rotates the rear leg lower member 162 relative to the rear leg upper member 161 according to the swing of the handle 30. If the handle 30 is arranged in the back push position, the linkage mechanism 170 positions the front leg lower member 142 and the rear leg lower member 162 in the fifth position, and if the handle 30 is arranged in the face-to-face push position, the linkage mechanism 170 positions the front leg lower member 142 and the rear leg lower member 162 in the sixth position. When the stroller body 111 has the linkage mechanism 170, the front and rear wheels 18 and 19 can be automatically changed in the front-to-back direction relative to the back seat connection part A by swinging the handle 30.

[0094] In the example shown in the figure, the linkage mechanism 170 includes a traction member 171 and a force member 172. The traction member 171 may be a flexible, elongated member. The traction member 171 may be a line, a rope, a chain, etc. The force member 172 applies force to the front leg lower member 142 in the circumferential direction of a circle centered on the front leg rotation axis X14. In addition, the force member 172 applies force to the rear leg lower member 162 in the circumferential direction of a circle centered on the rear leg rotation axis X16. The force member 172 may be, for example, a torsion spring. In this case, one end of the force member 172 of the front leg 14 may be fixed to the front leg upper member 141, and the other end may be fixed to the front leg lower member 142. In addition, one end of the force member 172 of the rear leg 16 may be fixed to the rear leg upper member 161, and the other end may be fixed to the rear leg lower member 162. The traction member 171 connects the front leg lower member 142 and the rear leg lower member 162 to the handle 30. If the swing of the handle 30 is configured to the back pushing position, the pulling member 171 pulls the front leg lower member 142 along the circumferential direction of the circle centered on the front leg rotation axis X14. In addition, if the swing of the handle 30 is configured to the back pushing position, the pulling member 171 pulls the rear leg lower member 162 along the circumferential direction of the circle centered on the rear leg rotation axis X16. The directions in which the pulling member 171 pulls the front leg lower member 142 and the rear leg lower member 162 are opposite to the directions in which the force applying member 172 applies force to the front leg lower member 142 and the rear leg lower member 162. It should be noted that if the swing of the handle 30 is configured to the face-to-face pushing position, the pulling member 171 is relaxed and does not apply a pulling force to the front leg lower member 142 and the rear leg lower member 162.

[0095] In such a linkage mechanism 170, when the handle 30 is arranged in the back push position, the front leg lower member 142 and the rear leg lower member 162 are arranged in the fifth position due to the traction force of the traction member 171. And, if the handle 30 is swung from the back push position to the face-to-face push position, the front leg lower member 142 and the rear leg lower member 162 rotate from the fifth position to the sixth position due to the force of the force application member 172. Thus, the front wheel 18 and the rear wheel 19 move from the third position to the fourth position. During the period when the handle 30 is arranged in the face-to-face push position, the front leg lower member 142 and the rear leg lower member 162 stay in the sixth position due to the force of the force application member 172. When the handle 30 is swung from the face-to-face push position to the back push position, the front leg lower member 142 and the rear leg lower member 162 rotate from the sixth position to the fifth position due to the traction force of the traction member 171. Thus, the front wheel 18 and the rear wheel 19 move from the fourth position to the third position.

[0096] Of course, if the handle 30 is arranged at the face-to-face pushing position, the traction member 171 may also traction the front leg lower member 142 in the circumferential direction of the circle centered on the front leg rotation axis X14, and traction the rear leg lower member 162 in the circumferential direction of the circle centered on the rear leg rotation axis X16. In this case, if the handle 30 is arranged at the back pushing position, the traction member 171 may be relaxed and not apply traction force to the front leg lower member 142 and the rear leg lower member 162. In such a linkage mechanism 170, when the handle 30 is arranged at the back pushing position, the front leg lower member 142 and the rear leg lower member 162 are arranged at the fifth position due to the force of the force applying member 172. And, if the handle 30 is swung from the back pushing position to the face-to-face pushing position, the front leg lower member 142 and the rear leg lower member 162 rotate from the fifth position to the sixth position due to the traction force of the traction member 171. While the handle 30 is arranged in the face-to-face pushing position, the front leg lower member 142 and the rear leg lower member 162 are retained in the sixth position due to the traction force of the traction member 171. When the handle 30 is swung from the face-to-face pushing position to the back pushing position, the front leg lower member 142 and the rear leg lower member 162 are rotated from the sixth position to the fifth position due to the urging force of the urging member 172.

[0097] In the second embodiment, the front connecting member 15 is disposed between the front leg upper members 141. Thus, the front leg lower member 142 can rotate relative to the front leg upper member 141. In addition, the rear connecting member 17 is disposed between the rear leg upper members 161. Thus, the rear leg lower member 162 can rotate relative to the rear leg upper member 161.

[0098] <<Modification of Second Embodiment>> Next, various modifications of the second embodiment will be described.

[0099] <Variation 2-1> In the above example, the stroller body 111 includes the linkage mechanism 170, and the front leg lower member 142 and the rear leg lower member 162 are rotated in conjunction with the swing of the handle 30 through the linkage mechanism 170, but the present invention is not limited thereto. The front leg lower member 142 and the rear leg lower member 162 can be manually rotated relative to the front leg upper member 141 and the rear leg upper member 161.

[0100] <Modification 2-2> In the above example, the front leg lower member 142 and the rear leg lower member 162 are held at the fifth position or the sixth position by the linkage mechanism 170, but the present invention is not limited thereto. The front leg lower member 142 and the rear leg lower member 162 may be held at the fifth position or the sixth position by a locking member. The locking member may fix the front leg upper member 141 and the front leg lower member 142 relative to the rear leg upper member 161 and the rear leg lower member 162, respectively.

[0101] The baby carriage 10 of the first embodiment and its modified example described above has a baby carriage body 11. The baby carriage body 11 includes a main frame 12, a handle 30, a seat support unit 40, a front wheel 18, a front wheel rotation axis holding member 18c, a rear wheel 19, and a rear wheel rotation axis holding member 19c. The main frame 12 includes a front leg 14 and a rear leg 16. The handle 30 is mounted on the main frame 12 in a manner that can swing in the front and rear directions. The seat support unit 40 is held by the main frame 12. The front wheel 18 can rotate around a front wheel rotation axis 18b extending in the horizontal direction. The front wheel rotation axis holding member 18c is connected to the front leg 14 to hold the front wheel rotation axis 18b. The rear wheel 19 can rotate around a rear wheel rotation axis 19b extending in the horizontal direction. The rear wheel rotation axis holding member 19c is connected to the rear leg 16 to hold the rear wheel rotation axis 19b. The front wheel rotation axis holding member 18c can move in the front and rear directions relative to the front leg 14. The rear wheel rotation axis holding member 19c is movable in the front-to-back direction relative to the rear legs 16. According to such a baby carriage 10, the distance in the front-to-back direction between the center of gravity of the infant riding in the baby carriage 10 and the front wheel rotation axis 18b can be changed. Therefore, the operability of the baby carriage 10 when the handle 30 is arranged in the face-to-face pushing position can be improved. In addition, the rear wheel 19 can be moved relative to the main frame 12 in coordination with the movement of the front wheel 18 relative to the main frame 12. Therefore, even if the front wheel 18 is moved relative to the main frame 12, the change in the distance between the front wheel 18 and the rear wheel 19 can be suppressed, and the possibility of damage to the stability of the baby carriage 10 can be suppressed.

[0102] In the first embodiment and its modified examples described above, the stroller body 11 includes the linkage mechanism 70. The linkage mechanism 70 moves the front wheel rotation axis holding member 18c in the front-rear direction relative to the front legs 14 and moves the rear wheel rotation axis holding member 19c in the front-rear direction relative to the rear legs 16 in accordance with the swinging of the handle 30. According to such a stroller 10, the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c can be automatically moved in accordance with the swinging of the handle 30.

[0103] In the first embodiment and its modified example described above, the handle 30 can swing in the front-to-back direction between the back push position and the face-to-face push position. The front wheel rotation axis holding component 18c and the rear wheel rotation axis holding component 19c are positioned at the first position when the handle 30 is in the back push position. In addition, the front wheel rotation axis holding component 18c and the rear wheel rotation axis holding component 19c are positioned at the second position further rearward than the first position when the handle 30 is in the face-to-face push position. According to such a baby carriage 10, the distance in the front-to-back direction between the front wheel rotation axis 18b and the above-mentioned infant when the handle 30 is arranged in the face-to-face push position can be made smaller than the distance in the front-to-back direction between the front wheel rotation axis 18b and the above-mentioned infant when the handle 30 is arranged in the back push position. As a result, the operability of the baby carriage 10 when the handle 30 is arranged in the face-to-face push position can be improved.

[0104] In the first embodiment and its modified example described above, the front wheel rotation axis holding member 18c can rotate around the front wheel rotation axis 18d extending in the vertical direction. The distance D4 in the front-to-back direction between the first position and the second position is more than twice the distance D5 in the horizontal direction between the front wheel rotation axis 18d and the front wheel rotation axis 18b in the plane perpendicular to the front wheel rotation axis 18b. According to such a baby carriage 10, the change in the distance in the front-to-back direction between the front wheel rotation axis 18b and the center of gravity of the infant on the baby carriage 10 caused by the rotation of the front wheel 18 can be eliminated. Thus, the change in the operability of the baby carriage 10 caused by the rotation of the front wheel 18 can be suppressed.

[0105] In the modified example of the first embodiment described above, the stroller body 11 includes the locking member 75. The locking member 75 can fix the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c to the front leg 14 and the rear leg 16, respectively. According to such a stroller 10, the possibility of the front wheel rotation axis holding member 18c and the rear wheel rotation axis holding member 19c accidentally moving relative to the front leg 14 and the rear leg 16 can be suppressed.

[0106] The baby carriage 10 of the modified example of the first embodiment described above has a baby carriage body 11. The baby carriage body 11 includes a main frame 12, a handle 30, a seat support unit 40, a front wheel 18, and a rear wheel 19. The main frame 12 includes a front leg 14 and a rear leg 16. The handle 30 is mounted on the main frame 12 in a manner that can swing in the front-back direction. The seat support unit 40 is held by the main frame 12. The front wheel 18 can rotate around a front wheel rotation axis 18b extending in the horizontal direction. The rear wheel 19 can rotate around a rear wheel rotation axis 19b extending in the horizontal direction. The front leg 14 holds the front wheel rotation axis 18b so that it can move in the front-back direction. The rear leg 16 holds the rear wheel rotation axis 19b so that it can move in the front-back direction. According to such a baby carriage 10, the distance in the front-back direction between the center of gravity of the infant riding in the baby carriage 10 and the front wheel rotation axis 18b can be changed. Therefore, the operability of the baby carriage 10 when the handle 30 is arranged in the face-to-face pushing position can be improved. In addition, the rear wheels 19 can be moved relative to the main frame 12 in coordination with the movement of the front wheels 18 relative to the main frame 12. Therefore, even if the front wheels 18 are moved relative to the main frame 12, the change in the distance between the front wheels 18 and the rear wheels 19 can be suppressed, thereby suppressing the possibility of damage to the stability of the stroller 10.

[0107] The stroller 110 of the second embodiment and its modified example described above includes a stroller body 111. The stroller body 111 includes a main frame 12, a handle 30, a seat support unit 40, a front wheel 18, and a rear wheel 19. The main frame 12 includes a front leg 14 and a rear leg 16. The handle 30 is mounted on the main frame 12 in a manner that can swing in the front and rear directions. The seat support unit 40 is held by the main frame 12. The front wheel 18 is mounted on the lower part of the front leg 14. The front wheel 18 can rotate around a front wheel rotation axis 18b extending in the horizontal direction. The rear wheel 19 is mounted on the lower part of the rear leg 16. The rear wheel 19 can rotate around a rear wheel rotation axis 19b extending in the horizontal direction. The front leg 14 includes a front leg upper member 141 forming the upper part of the front leg 14 and a front leg lower member 142 forming the lower part of the front leg 14. The front leg lower member 142 can rotate relative to the front leg upper member 141 around a front leg rotation axis X14 along the vertical direction. The rear leg 16 includes a rear leg upper member 161 forming the upper part of the rear leg 16 and a rear leg lower member 162 forming the lower part of the rear leg 16. The rear leg lower member 162 can rotate relative to the rear leg upper member 161 around the rear leg rotation axis X16 along the vertical direction. By rotating the front leg lower member 142 relative to the front leg upper member 141, the position of the front wheel 18 relative to the seat support unit 40 in the front-to-back direction changes. By rotating the rear leg lower member 162 relative to the rear leg upper member 161, the position of the rear wheel 19 relative to the seat support unit 40 in the front-to-back direction changes. According to such a baby carriage 10, the distance between the center of gravity of the infant riding in the baby carriage 10 and the front wheel rotation axis 18b in the front-to-back direction can be changed. Therefore, the operability of the baby carriage 10 when the handle 30 is arranged in the face-to-face pushing position can be improved. In addition, the rear wheel 19 can be moved relative to the main frame 12 in conjunction with the movement of the front wheel 18 relative to the main frame 12. Therefore, even if the front wheel 18 is moved relative to the main body frame 12 , the distance between the front wheel 18 and the rear wheel 19 can be suppressed from changing, and the possibility of the stability of the baby carriage 10 being impaired can be suppressed.

[0108] In the second embodiment and its modified example described above, the front leg rotation axis X14 passes through the front leg upper member 141. The front leg lower member 142 is connected to the front leg upper member 141 radially outside the circle centered on the front leg rotation axis X14. The rear leg rotation axis X16 passes through the rear leg upper member 161. The rear leg lower member 162 is connected to the rear leg upper member 161 radially outside the circle centered on the rear leg rotation axis X16. According to such a baby carriage 10, by rotating the front leg lower member 142 relative to the front leg upper member 141, the position of the front wheel 18 relative to the seat support unit 40 in the front-rear direction can be changed. In addition, by rotating the rear leg lower member 162 relative to the rear leg upper member 161, the position of the rear wheel 19 relative to the seat support unit 40 in the front-rear direction can be changed.

[0109] In the second embodiment and its modified example described above, the front leg lower member 142 and the rear leg lower member 162 are inclined relative to the vertical direction. According to such a baby carriage 10, by rotating the front leg lower member 142 relative to the front leg upper member 141, the position of the front wheel 18 relative to the seat support unit 40 in the front-rear direction can be changed. In addition, by rotating the rear leg lower member 162 relative to the rear leg upper member 161, the position of the rear wheel 19 relative to the seat support unit 40 in the front-rear direction can be changed.

[0110] In the second embodiment and its modified example described above, the stroller body 111 includes the linkage mechanism 170. The linkage mechanism 170 rotates the front leg lower member 142 relative to the front leg upper member 141 and the rear leg lower member 162 relative to the rear leg upper member 161 in accordance with the swing of the handle 30. According to such a stroller 10, the front leg lower member 142 and the rear leg lower member 162 can be automatically rotated in accordance with the swing of the handle 30.

[0111] In the second embodiment and its modified example described above, the handle 30 can swing in the front-to-back direction between the back push position and the face-to-face push position. If the handle 30 is in the back push position, the front wheel 18 and the rear wheel 19 are in the third position, and if the handle 30 is in the face-to-face push position, the front wheel 18 and the rear wheel 19 are in the fourth position further rearward than the third position. According to such a baby carriage 110, the distance in the front-to-back direction between the front wheel rotation axis 18b and the center of gravity of the infant when the handle 30 is arranged in the face-to-face push position can be made smaller than the distance in the front-to-back direction between the front wheel rotation axis 18b and the center of gravity of the infant when the handle 30 is arranged in the back push position. As a result, the operability of the baby carriage 10 when the handle 30 is arranged in the face-to-face push position can be improved.

[0112] In the modified example of the second embodiment described above, the stroller body 111 includes a locking member. The locking member can fix the front leg lower member 142 and the rear leg lower member 162 to the front leg upper member 141 and the rear leg upper member 161, respectively. According to such a stroller 10, the possibility of the front leg lower member 142 and the rear leg lower member 162 being accidentally rotated can be suppressed.

[0113] It should be noted that, although several modified examples of the above embodiment have been described above, it is of course possible to appropriately combine a plurality of modified examples and apply them.

Claims

1. A baby stroller, characterized in that: The invention has a baby stroller body, The baby carriage body comprises: a main frame, which includes front legs and rear legs; A handle mounted on the main frame in a manner that allows it to swing in a front-rear direction; a seat support unit held on the main body frame; A front wheel capable of rotating about a front wheel rotation axis extending in a horizontal direction; A front wheel rotation axis holding component connected to the front leg to hold the front wheel rotation axis; a rear wheel rotatable about a rear wheel rotation axis extending in a horizontal direction; and A rear wheel rotation axis holding component is connected to the rear legs to hold the rear wheel rotation axis. The front wheel rotation axis holding member is movable in the front-rear direction relative to the front leg. The rear wheel rotation axis holding member is movable in the front-rear direction relative to the rear leg.

2. The baby stroller according to claim 1, characterized in that: The stroller body includes a linkage mechanism that moves the front wheel rotation axis holding member in the front-rear direction relative to the front legs and moves the rear wheel rotation axis holding member in the front-rear direction relative to the rear legs according to the swing of the handle.

3. The baby stroller according to claim 2, characterized in that: The handle can be swung in the front-to-back direction between a rear-side push position and a face-to-face push position, When the handle is located at the back pushing position, the front wheel rotation axis holding component and the rear wheel rotation axis holding component are located at a first position, and when the handle is located at the face-to-face pushing position, the front wheel rotation axis holding component and the rear wheel rotation axis holding component are located at a second position further rearward than the first position.

4. The baby stroller according to claim 3, characterized in that: The front wheel rotation axis holding member can rotate around the front wheel rotation axis extending in the vertical direction. A distance between the first position and the second position in the front-rear direction is at least twice a distance between the front wheel rotation axis and the front wheel rotation axis in the horizontal direction in a plane perpendicular to the front wheel rotation axis.

5. The baby stroller according to claim 1, characterized in that: The stroller body includes a locking member capable of fixing the front wheel rotation axis holding member and the rear wheel rotation axis holding member relative to the front leg and the rear leg, respectively.

6. A baby stroller, characterized in that: The invention has a baby stroller body, The baby carriage body comprises: a main frame, which includes front legs and rear legs; A handle mounted on the main frame in a manner that allows it to swing in a front-rear direction; a seat support unit held on the main body frame; A front wheel capable of rotating about a front wheel rotation axis extending in a horizontal direction; as well as The rear wheel is rotatable about a rear wheel rotation axis extending in a horizontal direction, The front legs hold the front wheel rotation axis so as to be movable in the front-rear direction. The rear legs hold the rear wheel rotation axis so as to be movable in the front-rear direction.

7. A baby stroller, characterized in that: The invention has a baby stroller body, The baby carriage body comprises: a main frame, which includes front legs and rear legs; A handle mounted on the main frame in a manner that allows it to swing in a front-rear direction; a seat support unit held on the main body frame; A front wheel mounted on a lower portion of the front leg and rotatable about a front wheel rotation axis extending in a horizontal direction; and The rear wheel is mounted on the lower part of the rear legs and is rotatable about a rear wheel rotation axis extending in the horizontal direction. The front leg includes a front leg upper member constituting an upper portion of the front leg and a front leg lower member constituting a lower portion of the front leg. The front leg lower member can rotate relative to the front leg upper member around the front leg rotation axis along the vertical direction. The hind leg includes an upper hind leg member constituting an upper portion of the hind leg and a lower hind leg member constituting a lower portion of the hind leg. The rear leg lower member can rotate relative to the rear leg upper member about the rear leg rotation axis in the vertical direction. By rotating the front leg lower member relative to the front leg upper member, the position of the front wheel relative to the seat support unit in the front-rear direction is changed. By rotating the rear leg lower member relative to the rear leg upper member, the position of the rear wheel relative to the seat support unit in the front-rear direction is changed.

8. The baby stroller according to claim 7, characterized in that: The front leg rotation axis passes through the front leg upper component, The front leg lower member is connected to the front leg upper member at the radially outer side of a circle centered on the front leg rotation axis. The rear leg rotation axis passes through the rear leg upper member, The rear leg lower member is connected to the rear leg upper member at a radially outer side of a circle centered on the rear leg rotation axis.

9. The baby stroller according to claim 7, characterized in that: The front leg lower member and the rear leg lower member are inclined with respect to the vertical direction.

10. The baby stroller according to claim 7, characterized in that: The stroller body includes a linkage mechanism that rotates the front leg lower member relative to the front leg upper member and rotates the rear leg lower member relative to the rear leg upper member in response to the swing of the handle.

11. The baby stroller according to claim 10, characterized in that: The handle can swing in the front-to-back direction between a back-pushing position and a face-to-face pushing position. When the handle is located at the back-pushing position, the front wheel and the rear wheel are located at a third position, and when the handle is located at the face-to-face pushing position, the front wheel and the rear wheel are located at a fourth position further rearward than the third position.

12. The baby stroller according to claim 7, characterized in that: The stroller body includes a locking component capable of fixing the front leg lower member and the rear leg lower member relative to the front leg upper member and the rear leg upper member, respectively.

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