Baby carriage

Abstract

To suppress operability of a baby carriage from being varied due to switching of a position of a handle.SOLUTION: A baby carriage 10 comprises a baby carriage body 11. The baby carriage body 11 includes a body frame 12, a seat support unit 40 held by the body frame 12, and a handle 30. The handle 30 is mounted on the body frame 12 to be swingable in a longitudinal direction. The seat support unit 40 includes a seat support body 41. A position of the seat support body 41 in the body frame 12 can be changed in the longitudinal direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Strollers used for taking babies and infants out are widely used. Strollers have a seat support unit that supports a seat on which a baby sits, a main frame that supports the seat support unit, and a handle attached to the main frame. The seat support unit is fixed to the main frame. Patent Document 1 discloses such a stroller. The stroller disclosed in Patent Document 1 allows the position of the handle to be switched between a back-pushing position and a front-pushing position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-202982 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a stroller in which the position of the handle can be switched between a rear-pushing position and a forward-pushing position, the distance between the grip of the handle and the center of gravity of the baby on the stroller generally differs when the handle is in the rear-pushing position and when it is in the forward-pushing position. This makes it difficult to operate the stroller when the handle is in the rear-pushing position and when it is in the forward-pushing position, and in one case, the stroller may be difficult to operate.

[0005] The present invention has been made in consideration of the above points, and has an object to suppress changes in the operability of a stroller caused by changing the position of the handle. [Means for solving the problem]

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

[17] .

[0007] [1] A stroller including a stroller body, The stroller body is A body frame, a seat support unit held by the main body frame; A handle attached to the main body frame so as to be swingable in the front-rear direction; Including, The seat support unit includes a seat support, A stroller, wherein the position of the seat support on the main body frame is changeable in the front-rear direction.

[0008] [2] The stroller described in [1], wherein the main body frame includes a locking mechanism capable of fixing the seat support to the main body frame.

[0009] [3] The seat support is movable between a first position and a second position forward of the first position; The stroller described in [2], wherein the locking mechanism fixes the seat support in the first position or the second position.

[0010] [4] The stroller described in [3], wherein the locking mechanism fixes the seat support to the main body frame when the seat support reaches the second position from the side of the first position, or when the seat support reaches the first position from the side of the second position.

[0011] [5] the main body frame includes a locking mechanism capable of fixing the seat support to the main body frame, The stroller according to any one of [1] to [4], wherein the locking mechanism can release the seat support from the main body frame as the handle swings.

[0012] [6] The handle can be pivoted between a back pressing position and a front pressing position, The stroller described in [5], wherein when the handle is moved from the rear pushing position toward the forward pushing position, or when the handle is moved from the forward pushing position toward the rear pushing position, the locking mechanism can release the seat support from being fixed to the main frame.

[0013] [7] The body frame includes front legs and rear legs, The seat support is movable between a first position and a second position forward of the first position; The stroller described in any of [1] to [6], wherein, when viewed from the side, the front-to-rear distance between the first position and the second position is at least one-fourth of the distance between the front legs and the rear legs at the height position of the seat support in the first position.

[0014] [8] The seat support unit includes a back support; The stroller according to any one of [1] to [7], wherein the back support is movable together with the seat support.

[0015] [9] The body frame includes front legs and rear legs, the back support is connected to the seat support; The stroller described in [8], wherein, when viewed from the side, the seat support unit is movable between a first position in which the connection portion between the seat support and the back support is behind the rear legs, and a second position in which the connection portion is in front of the rear legs.

[0016]

[10] The main body frame includes: The front legs and A front wheel holding member connected to the front leg; a front wheel held by the front wheel holding member so as to be rotatable around a front wheel rotation axis extending in a horizontal direction; The hind legs and A rear wheel holding member connected to the rear leg; a rear wheel held by the rear wheel holding member so as to be rotatable around a rear wheel rotation axis extending in a horizontal direction; Including, The seat support is movable between a first position and a second position forward of the first position; the back support is connected to the seat support; A stroller as described in [8] or [9], wherein, when viewed from the side, when the seat support is positioned in the second position, the fore-and-aft position of the connection part of the seat support and the back support is at least one-quarter of the fore-and-aft distance between the connection part of the front legs and the front wheel retaining member and the connection part of the rear legs and the rear wheel retaining member, and is forward of the connection part of the rear legs and the rear wheel retaining member.

[0017]

[11] The main body frame includes: The front legs and A front wheel holding member connected to the front leg; a front wheel held by the front wheel holding member so as to be rotatable around a front wheel rotation axis extending in a horizontal direction; Including, The seat support is movable between a first position and a second position forward of the first position; The front wheel holding member is rotatable about a front wheel pivot axis extending in a vertical direction, A stroller described in any of [1] to

[10] , wherein the fore-and-aft distance between the first position and the second position is more than twice the horizontal distance between the front wheel rotation axis and the front wheel rotation axis in a plane perpendicular to the front wheel rotation axis.

[0018]

[12] The stroller according to any one of [1] to

[11] , wherein the seat support is movable in the front-rear direction along a guide rail provided on the main body frame.

[0019]

[13] The main body frame includes: A first link member; a front leg connected to the first link member and rotatable relative to the first link member; a rear leg connected to the first link member and rotatable relative to the first link member; a second link member connected to the first link member and rotatable relative to the first link member; a third link member provided between the front leg and the second link member and rotatable relative to the front leg and the second link member; having The stroller according to any one of [1] to

[12] , wherein the third link member guides the movement of the seat support in the front-rear direction.

[0020]

[14] The main body frame includes a link member that configures the main body frame to be foldable and unfoldable, The stroller according to any one of [1] to

[13] , wherein any one of the link members guides the movement of the seat support.

[0021]

[15] The stroller according to any one of [1] to

[11] , wherein the seat support is attached to the main body frame so as to be swingable in the front-rear direction.

[0022]

[16] The seat support unit includes a top support, The stroller according to any one of [1] to

[15] , wherein the top support is movable together with the seat support.

[0023]

[17] The seat support unit includes a guard material, The stroller according to any one of [1] to

[16] , wherein the guard material is movable together with the seat support. Effect of the Invention

[0024] According to the present invention, changes in the operability of the stroller caused by changing the position of the handle can be suppressed. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a perspective view for explaining the overall configuration of a stroller. [Diagram 2] FIG. 2 is a side view showing the stroller of FIG. 1 with the handle in the rear pushing position. [Diagram 3] FIG. 3 is a side view of the stroller of FIG. 1 with the handle in the facing pushing position. [Figure 4] FIG. 4 is a side view showing the stroller of FIG. 1 in a folded state. [Diagram 5] FIG. 5 is a partial cross-sectional view of the right half of the stroller shown in FIG. 2, seen from the inside. [Figure 6] FIG. 6 is a partial cross-sectional view of the right half of the stroller shown in FIG. 3 as viewed from the inside. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5, illustrating the locking mechanism with the locking member in the locked position. [Figure 8] FIG. 8 is a view corresponding to FIG. 7, showing the locking mechanism with the locking member in the unlocked position. [Figure 9] FIG. 9 is a diagram showing a modified example of the stroller, and is a partial cross-sectional view of the right half of the stroller as viewed from the inside. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. [Figure 11A] 11A is a side view of the modified lock mechanism shown in FIG. [Figure 11B] 11B is a side view of the lock mechanism of the modified example shown in FIG. [Figure 11C] 11C is a side view of the modified locking mechanism shown in FIG. [Figure 12] FIG. 12 is a diagram showing a schematic diagram of yet another modified example of the stroller, and is a cross-sectional view of the right half of the stroller when the seat support is in the first position, viewed from the inside. [Figure 13] FIG. 13 is a view corresponding to FIG. 12 and is a cross-sectional view of the right half of the stroller when the seat support is in the second position, as viewed from the inside. [Figure 14]FIG. 14 is a diagram showing a schematic diagram of yet another modified example of the stroller, and is a cross-sectional view of the right half of the stroller when the seat support is in the first position, viewed from the inside. [Figure 15] FIG. 15 is a view corresponding to FIG. 14 and is a cross-sectional view of the right half of the stroller when the seat support is in the second position, as viewed from the inside. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] An embodiment of the present invention will now be described with reference to a specific example shown in the drawings.

[0027] 1 to 8 are diagrams for explaining an embodiment of a stroller according to the present invention, of which Fig. 1 to Fig. 4 show the overall configuration of one specific example of the stroller.

[0028] The stroller 10 of this embodiment includes a stroller body 11. As shown in Fig. 1, the stroller body 11 shown in the figure has a configuration that is generally symmetrical overall with respect to a plane along the front-rear and up-down directions. The stroller body 11 has a body frame 12 having front legs 14 and rear legs 16, a handle 30 attached to the body frame 12, and a seat support unit 40 supported by the body frame 12. In the example shown in the figure, the stroller body 11 further has a connecting member 60 and a locking mechanism 70.

[0029] In this embodiment, the handle 30 can swing back and forth relative to the main body frame 12. The position of the handle 30 can be changed between a rear-pushing position shown in Fig. 2 and a front-pushing position shown in Fig. 3. When the handle 30 is located in the rear-pushing position, the operator (guardian) grips the handle 30 from behind the baby to steer the stroller 10. At this time, the front legs 14 side of the stroller 10 is the front in the direction of travel. When the handle 30 is located in the front-pushing position, the operator grips the handle 30 from the side facing the baby to steer the stroller 10. At this time, the rear legs 16 side of the stroller 10 is the front in the direction of travel.

[0030] The seat support unit 40 supports a cushion seat on which an infant riding in the stroller 10 sits. The seat support unit 40 includes a seat support member 41 that supports the buttocks of an infant seated on the stroller body 11 from below.

[0031] The stroller 10 of this embodiment is devised to suppress changes in operability of the stroller 10 caused by changing the position of the handle 30. Specifically, the position of the seat support 41 on the main body frame 12 can be changed in the front-rear direction. This makes it possible to suppress changes in operability of the stroller 10 caused by changing the distance between the gripping part of the handle 30 (a middle part 33 described below) and the center of gravity of the baby on the seat support 41 caused by changing the position of the handle 30.

[0032] In this specification, the terms "front", "rear", "up", "down", "front-rear direction" and "up-down direction" for the stroller and its components mean "front", "rear", "up", "down", "front-rear direction" and "up-down direction" based on the baby riding in the stroller and its components in the unfolded state, unless otherwise specified. More specifically, the "front-rear direction" is the direction connecting the lower left and upper right of the paper in FIG. 1, and corresponds to the left-right direction of the paper in FIG. 2 and FIG. 3. And, unless otherwise specified, "front" is the side facing the baby riding in the stroller, and the lower left side of the paper in FIG. 1 and the left side of the paper in FIG. 2 and FIG. 3 are the front side. Meanwhile, the "up-down direction" is the direction perpendicular to the running surface of the stroller. Therefore, when the running surface is a horizontal plane, the "up-down direction" refers to the vertical direction. Also, the "lateral direction" is the width direction, which is the direction perpendicular to both the "front-rear direction" and the "up-down direction". Furthermore, the "rear side" means the side opposite to the side facing the baby riding in the stroller 10. Therefore, the "rear side" usually means the rear side.

[0033] In this specification, the inner side in the width direction refers to the side closer to the center of the stroller body 11 in the width direction, while the outer side in the width direction refers to the side farther away from the center of the stroller body 11 in the width direction.

[0034] 1 to 8, the stroller body 11 is foldable. Each element constituting the stroller body 11 will be described in further detail below.

[0035] (Main frame) As shown in FIG. 1, the main body frame 12 has a pair of front legs 14 arranged on the left and right, and a pair of rear legs 16 arranged on the left and right. The main body frame 12 further has a first link member L1, a second link member L2, a third link member L3, and a fourth link member L4 arranged on the left and right. The front legs 14, the rear legs 16, and the first to fourth link members L1 to L4 function as link members that configure the main body frame 12 to be foldable and unfoldable. In the illustrated example, the first link member L1 also functions as an armrest. That is, the first link member L1 is configured by the armrest.

[0036] A front wheel 18 and a rear wheel 19 are rotatably provided at the lower ends of the front legs 14 and the rear legs 16, respectively. The front wheels 18 and the rear wheels 19 are held by a front wheel holding member 18a and a rear wheel holding member 19a connected to the lower ends of the front wheels 18 and the rear wheels 19, respectively. The front wheel holding member 18a and the front wheels 18 form a caster. The front wheels 18 are rotatable around a front wheel rotation shaft 18b extending in the horizontal direction, and are rotatable around a front wheel swivel shaft 18c extending in the vertical direction. The rear wheel holding member 19a and the rear wheels 19 also form a caster. The rear wheels 19 are rotatable around a rear wheel rotation shaft 19b extending in the horizontal direction, and are rotatable around a rear wheel swivel shaft 19c extending in the vertical direction.

[0037] As shown in FIG. 2, the upper end portions of the front legs 14 are rotatably (swingably) connected to the front portion of the first link member L1 arranged on the corresponding side (left or right). The upper end portions of the rear legs 16 are rotatably (swingably) connected to the front portion of the first link member L1 arranged on the corresponding side (left or right). Also, as shown in FIG. 1, the upper portion of the second link member L2 is rotatably (swingably) connected to the rear portion of the first link member L1 arranged on the corresponding side (left or right). The second link member L2 is supported by the rear legs 16 when the main body frame 12 is unfolded.

[0038] The third link member L3 is provided between the front leg 14 and the second link member L2. The third link member L3 is connected at its front portion to a middle portion of the front leg 14. The third link member L3 is rotatable relative to the front leg 14 about a rotation axis extending in the width direction. Furthermore, the third link member L3 is connected at its rear portion to a lower portion of the second link member L2. The third link member L3 is rotatable relative to the second link member L2 about a rotation axis extending in the width direction.

[0039] 2 and 3, the third link member L3 is connected to the second link member L2 via a shaft member 20 extending in the width direction. The third link member L3 is also connected to the front legs 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 legs 14 and the second link member L2. In the illustrated example, the third link member L3 extends linearly in the longitudinal direction approximately when the stroller 10 is in the unfolded state.

[0040] As shown in FIG. 1, in the illustrated example, the fourth link member L4 is rotatably connected to the rear leg 16. The lower part of the fourth link member L4 is rotatably connected to the middle part of the rear leg 16. The fourth link member L4 is rotatably connected to the second link member L2 and the third link member L3. In the illustrated example, 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. This shaft member 20 penetrates the second link member L2, the fourth link member L4, and the third link member L3. With this configuration, the second link member L2, the third link member L3, and the fourth link member L4 are rotatable with each other around an axis line that coincides with the central axis line of the shaft member 20.

[0041] As shown in Fig. 1, the main frame 12 has, as laterally extending components, a front connector 15 that connects the pair of front legs 14 and a rear connector 17 that connects the pair of rear legs 16. The front connector 15 functions as a footrest. A central connector 21 is provided between the pair of third link members L3. The front connector 15, the rear connector 17 and the central connector 21 can suppress lateral deformation of the stroller 10.

[0042] (handle) As described above, the handle 30 can swing back and forth relative to the main body frame 12. The handle 30 can swing between a rear pushing position (see FIG. 2) and a front pushing position (see FIG. 3). In the illustrated example, the handle 30 is inclined relative to the vertical direction and extends upward backward in the rear pushing position. The handle 30 is inclined relative to the vertical direction and extends upward forward in the front pushing position.

[0043] In the illustrated example, the handle 30 has a handle body 31 swingably attached to the body frame 12 and a holder 35 provided on the handle body 31 .

[0044] As shown in FIG. 1, the handle body 31 has a generally U-shaped configuration. The handle body 31 is rotatably (swingably) connected to the body frame 12 at both ends of the U-shape. The handle body 31 includes a pair of handle extensions 32 extending generally parallel to each other, and an intermediate portion 33 connecting the pair of handle extensions 32. The pair of handle extensions 32 are disposed on the outer sides of the body frame 12 in the width direction. Each handle extension 32 is rotatably connected to the body frame 12 at its lower end. The intermediate portion 33 is a gripping portion that is gripped by the operator (guardian).

[0045] In the illustrated example, the handle body 31 is rotatably connected to the main body frame 12 by 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 are rotatable relative to each other around the same axis defined by the shaft member 20. The handle 30 can be maintained in the back pressing position shown in FIG. 2 by engaging the retainer 35 provided on the handle 30 with the first retainer 36 (see FIG. 3) of the main body frame 12. The handle 30 can be maintained in the face-to-face pressing position shown in FIG. 3 by engaging the retainer 35 provided on the handle 30 with the second retainer 37 (see FIG. 2) of the main body frame 12.

[0046] In the illustrated example, the engagement between the holder 35 and the holding members 36, 37 can be released by pulling up the holder 35 along the handle extension portion 32. Therefore, when swinging the handle 30 between the back-pushing position and the face-pushing position, the holder 35 is pulled up along the handle extension portion 32 to release the engagement between the holder 35 and the holding members 36, 37, and then the handle 30 is swung relative to the main body frame 12.

[0047] The stroller body 11 having the above configuration can be folded by rotating each component relative to the other. Specifically, the handle 30 arranged at the rear pressing position is used to once pull the second link member L2 upward and rearward, and then push it downward, thereby rotating the fourth link member L4 in the clockwise direction in FIG. 2 relative to the rear leg 16. With this operation, the first link member L1 and the third link member L3 rotate in the clockwise direction in FIG. 2 relative to the second link member L2. With this operation, the second link member L2 and the front leg 14 approach each other while maintaining a substantially parallel arrangement in a side view, and the position of the handle 30 relative to the main body frame 12 is lowered. In this manner, the stroller body 11 can be folded as shown in FIG. 4. In the folded state of FIG. 4, the dimensions of the stroller 10 in the front-rear and up-down directions can be reduced. On the other hand, in order to unfold the stroller body 11 from the folded state, the above-mentioned folding operations are carried out in reverse order.

[0048] The stroller 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 stroller body 11 can be folded. In the illustrated example, the handle 30 has a remote control device 38 connected to the state maintaining mechanism. As shown in FIG. 1, the remote control device 38 is provided on the middle part 33 of the handle body 31. By operating the remote control device 38, the state maintaining mechanism is operated, and the stroller body 11 can be folded.

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

[0050] The seat support 41 has a front frame member 42. The front frame member 42 is a frame member formed in a substantially U-shape. The front frame member 42 has a pair of side portions 43 extending in the front-rear direction, and a front end portion 44 extending in the width direction and connecting the front ends of the pair of side portions 43. The seat support 41 includes a fabric (not shown) that is stretched over the front frame member 42 and defines the seat surface. Alternatively, the seat support 41 includes a seat plate (not shown) that is supported from below by the front frame member 42 and defines the seat surface. The seat plate is a plate-shaped member formed using resin or metal. In addition, when the seat support 41 includes a seat plate, the seat support 41 does not need to include the front frame member 42.

[0051] As described below, the seat support 41 is held by the third link member L3. This allows the seat support 41 to rotate in conjunction with the rotation of the third link member L3 when folding the stroller body 11. When folding the stroller body 11, the angle of the seat support 41 relative to the second link member L2 can be automatically reduced, and the dimension of the stroller 10 in the folded state in the front-rear direction can be reduced. In other words, in a side view of the stroller 10 in the folded state, the seat support 41 can be prevented from protruding forward beyond the main body frame 12.

[0052] The back support 45 has a rear frame member 46. The rear frame member 46 is a frame member formed in a substantially U-shape. The rear frame member 46 has a pair of side portions 47 extending in the front-rear direction and / or the up-down direction, and a rear end portion 48 extending in the width direction and connecting the rear ends of the pair of side portions 47. In the illustrated example, the back support member 45 is connected to the seat support member 41. More specifically, the rear frame member 46 extends upward and rearward from the rear end of the front frame member 42. The front end of the back support member 45 is connected to the rear end of the front frame member 42 so as to be rotatable about a rotation axis extending in the width direction. This rotation axis passes through a connection portion A between the back support member 45 and the seat support member 41 (hereinafter also referred to as the "back-seat connection portion A"). The back support member 45 can be reclined relative to the seat support member 41 by rotating relative to the seat support member 41. The back support 45 may further include a fabric or plate-like material supported by the rear frame member 46 .

[0053] The back support 45 is supported from the rear by a reclining belt 49, both ends of which are connected to the main frame 12. This prevents the back support 45 from falling backward. The length of the reclining belt 49 is variable. By adjusting the length of the reclining belt 49, the back support 45 can be reclined. The reclining belt 49 is shown only in Figs. 2 and 3. The reclining belt 49 is omitted in the other figures.

[0054] In the illustrated example, both ends of the reclining belt 49 are connected to the first link member L1. The reclining belt 49 is disposed at its center on the back side of the back support 45 and is connected to the first link member L1 at both ends, so that when the main frame 12 is folded, the back support 45 can be rotated relative to the second link member L2 in association with the rotation of the first link member L1. When the stroller 10 is folded, the angle of the back support 45 relative to the second link member L2 can be automatically reduced, and the dimension of the stroller 10 in the folded state in the front-rear direction can be reduced. In other words, when the stroller 10 is viewed from the side in the folded state, the back support 45 can be prevented from protruding rearward from the second link member L2.

[0055] 5, the seat support unit 40 has a pair of side support parts 50 and side frame members 51 extending in the vertical direction. The side support parts 50 are located above the side parts 47 of the back support 45. In the illustrated example, the lower ends of the side support parts 50 are fixed to the seat support 41.

[0056] The side frame material 51 is a frame material formed in a substantially U-shape. Both ends of the side frame material 51 are connected to the upper ends of the side support parts 50. The side frame material 51 is connected to the side support parts 50 so as to be rotatable about a rotation axis parallel to the width direction.

[0057] A pair of connecting frame members 52 is provided between the side frame member 51 and the rear frame member 46. The pair of connecting frame members 52 are arranged spaced apart from each other in the width direction. The connecting frame member 52 is rotatable with respect to the rear frame member 46 and the side frame member 51. The connecting frame member 52 functions as a link member, and causes one of the rear frame member 46 and the side frame member 51 to swing in conjunction with the swinging of the other. The connecting frame member 52 also forms a wall portion between the rear portion of the rear frame member 46 and the rear portion of the side frame member 51 that is located behind the head of the infant when the back support member 45 is lying down, and forms a wall portion that is located behind the head of the infant when the back support member 45 is upright.

[0058] The seat support unit 40 also has a pair of guard supports 54 connected to the left and right side portions of the seat support 41, and a guard material 55 extending between the pair of guard supports 54. The left and right ends of the guard material 55 are detachably connected to the left and right guard supports 54, respectively. The seat support unit 40 also has a hood support 57 that supports a hood cloth (not shown). The hood support 57 includes a pair of hood support members 58 fixed to both ends of the side frame member 51, respectively, and a hood bone 59 extending between the pair of hood support members 58. The hood cloth is attached to the hood bone 59 to form a hood. The hood covers an infant seated on the seat support unit 40 from above, providing an environment that is shaded from the sun for the infant.

[0059] (Connecting parts) The connecting member 60 connects the main body frame 12 and the seat support 41. In the illustrated example, the stroller main body 11 includes a rear connecting member 61 and a front connecting member 62. As shown in FIG. 3, the front connecting member 62 is located in front of the rear connecting member 61. Each connecting member 61, 62 has a base 63 fixed to the seat support 41 and a downward extending portion 64 extending downward from the base 63. An annular portion 65 through which the third link member L3 is inserted is formed at the lower end of the downward extending portion 64. The downward extending portion 64 is connected to the third link member L3 so as to be slidable in the front-rear direction. Therefore, each connecting member 61, 62 is guided by the third link member L3 and can move in the front-rear direction. In other words, the third link member L3 functions as a rail member that guides the movement of the rear connecting member 61 and the front connecting member 62 in the front-rear direction. In the illustrated example, the guard support 54 is connected to the base 63 of the front connecting member 62 .

[0060] Since the body frame 12 and the seat support 41 are connected by such a connecting member 60, the seat support 41 can move in the front-rear direction relative to the body frame 12. This allows the seat support 41 to move forward relative to the body frame 12 when putting an infant on or taking an infant off the seat support 41, or when caring for an infant on the seat support 41. Normally, an operator (guardian) puts an infant on or takes an infant off the seat support 41, or takes care of an infant on the seat support 41, from the front of the stroller 10. By moving the seat support 41 forward relative to the body frame 12, the seat support 41 can be brought closer to the operator (guardian), making it easier to put an infant on or take an infant off the seat support 41, or to care for an infant on the seat support 41. More specifically, when putting an infant on and taking an infant off the seat support 41 or when taking care of an infant on the seat support 41, the possibility that the approach of the operator (guardian) to the seat support 41 is hindered by the main frame 12 is suppressed. In the illustrated example, the seat support 41 is movable between a first position shown in FIG. 2 and a second position shown in FIG. 3. The second position is forward of the first position. In FIG. 3, the handle 30 is disposed at the facing pushing position, but the seat support 41 can also be disposed at the second position while the handle 30 is disposed at the back pushing position. By disposing the seat support 41 at the second position while the handle 30 is disposed at the back pushing position, the possibility that the approach of the operator (guardian) to the seat support 41 is hindered by the main frame 12 and the handle 30 is suppressed when putting an infant on and taking an infant off the seat support 41 or when taking care of an infant on the seat support 41.

[0061] In Fig. 5, the seat support 41 in the first position is shown by a solid line, and the seat support 41 in the second position is shown by a dashed line. Figs. 5 and 6 are partial cross-sectional views of the right half of the stroller 10 shown in Figs. 2 and 3, respectively, viewed from the inside.

[0062] In the illustrated example, when the seat support body 41 moves in the front-rear direction relative to the main frame 12, the rear connecting member 61 and the front connecting member 62 slide on the third link member L3 while supporting the seat support body 41. Therefore, the seat support body 41 moves in the front-rear direction on the main frame 12 stably.

[0063] In the illustrated example, the seat support 41 is supported from below by the connecting member 60 attached to the main body frame 12. In other words, the seat support 41 is disposed above the connection portion (the third link member L3 in the illustrated example) between the main body frame 12 and the connecting member 60. This allows the height position of the seat support 41 to be higher relative to the main body frame 12. By raising the height position of the seat support 41, the seat support 41 can also be brought closer to the operator (guardian), making it easier to load and unload an infant on the seat support 41 and to care for an infant on the stroller 10.

[0064] Furthermore, by moving the seat support 41 relative to the main body frame 12, it is possible to suppress changes in the operability of the stroller 10 caused by changing the position of the handle 30. This is for the following reasons.

[0065] First, the maneuverability of the stroller 10 changes depending on the front-to-rear distance between the grip part (middle part 33) of the handle 30 and the center of gravity of the baby on the seat support 41. In general, the maneuverability of the stroller 10 improves as the front-to-rear distance between the grip part 33 and the center of gravity of the baby on the seat support 41 becomes shorter. The front-to-rear position of the baby's center of gravity on the main frame 12 roughly coincides with the front-to-rear position of the seat-back connection part A on the main frame 12. Therefore, the maneuverability of the stroller 10 changes depending on the front-to-rear distance between the grip part 33 and the seat-back connection part A, and improves as this distance becomes shorter.

[0066] In a conventional stroller in which the position of the seat support 41 in the front-rear direction cannot be changed, the distance in the front-rear direction between the grip 33 and the back-seat connection part A is different when the handle 30 is placed in the rear-pushing position and when it is placed in the front-pushing position. Therefore, the operability of the stroller 10 is different when the handle 30 is placed in the rear-pushing position and when it is placed in the front-pushing position. For example, in a stroller in which the seat support 41 is fixed in the first position shown in FIG. 2, the operability of the stroller 10 is good when the handle 30 is placed in the rear-pushing position. This is because the distance in the front-rear direction between the grip 33 and the back-seat connection part A is short. On the other hand, the operability of such a stroller is impaired when the handle 30 is placed in the front-pushing position. This is because the distance in the front-rear direction between the grip 33 and the back-seat connection part A is long.

[0067] In this embodiment, by moving the seat support 41 to the second position when the handle 30 is placed in the facing-pushing position, the distance in the front-to-rear direction between the grip part 33 and the seat-back connection part A can be shortened, improving the operability of the stroller 10 when the handle 30 is placed in the facing-pushing position. In other words, by changing the front-to-rear position of the seat support 41 on the main body frame 12 in response to the swinging of the handle 30, it is possible to suppress changes in the distance in the front-to-rear direction between the grip part 33 and the seat-back connection part A caused by changing the position of the handle 30, and suppress changes in the operability of the stroller 10.

[0068] As described above, in the illustrated example, the back support 45, the guard material 55, and the hood support 57 are connected to the seat support 41. Therefore, when the seat support 41 is moved in the front-rear direction relative to the main body frame 12, the positions of the back support 45, the guard material 55, and the hood support 57 in the front-rear direction relative to the main body frame 12 automatically change. In other words, when the seat support 41 is moved forward relative to the main body frame 12, the back support 45, the guard material 55, and the hood support 57 move forward together with the seat support 41. Also, when the seat support 41 is moved backward relative to the main body frame 12, the back support 45, the guard material 55, and the hood support 57 move backward together with the seat support 41. Therefore, even if the position of the seat support 41 in the front-rear direction relative to the main body frame 12 changes, the positional relationship between the seat support 41 and the back support 45, the guard material 55, and the hood support 57 is maintained. Therefore, the seat support 41 moves relative to the main frame 12, which does not change the dimensions of the living space of the seat support unit 40, or change the positions of the guard material 55 and the hood relative to the baby on the seat support 41. This prevents the change in the ride comfort of the stroller before and after changing the position of the seat support 41 in the front-rear direction. In addition, even if the position of the seat support 41 in the front-rear direction is changed, a sunshade environment can be appropriately provided. Furthermore, when the position of the seat support 41 in the front-rear direction on the main frame 12 is changed in response to the swinging of the handle 30, the back support 45, the guard material 55, and the hood support 57 move together with the seat support 41, which prevents the change in the distance in the front-rear direction between the grip part 33 of the handle 30 and the center of gravity of the seat support unit 40 when the position of the handle 30 is changed, and the change in the operability of the stroller 10 is further effectively prevented.

[0069] (locking mechanism) The locking mechanism 70 can fix the seat support 41 to the main body frame 12. The locking mechanism 70 may fix the seat support 41 at a first position or a second position. This prevents the seat support 41 from unintentionally moving from the first position or the second position. The locking mechanism 70 will be described below with reference to Figures 7 and 8. Figures 7 and 8 are cross-sectional views taken along line VII-VII in Figure 5.

[0070] In the example shown in FIG. 7 and FIG. 8, the lock mechanism 70 includes a lock member 71 and a biasing member 73. The lock member 71 is movable in the width direction relative to the main body frame 12. The lock member 71 is movable between a locked position shown in FIG. 7 and an unlocked position shown in FIG. 8. The lock member 71 can be disposed in the locked position when the seat support 41 is disposed in the first position or the second position. When the lock member 71 is in the locked position, it interferes with the connecting member 60 and restricts the movement of the seat support 41 in the front-rear direction. In the illustrated example, when the seat support 41 is in the first position and the lock member 71 is in the locked position, the lock member 71 faces the front end of the rear connecting member 61 and restricts the forward movement of the connecting member 60 (see FIG. 5). When the seat support 41 is in the second position and the lock member 71 is in the locked position, the lock member 71 faces the rear end of the rear connecting member 61 and restricts the rearward movement of the connecting member 60 (see FIG. 6).

[0071] An operating unit 72 is connected to the locking member 71. By operating the operating unit 72, the locking member 71 can be moved in the width direction. The biasing member 73 biases the locking member 71 from the outside toward the inside in the width direction. Therefore, when the operating unit 72 is not operated, the locking member 71 is disposed in the locked position. By operating the operating unit 72 to move the locking member 71 outward in the width direction, the locking member 71 can be moved to the unlocked position.

[0072] In a stroller 10 having such a locking mechanism 70, when moving the seat support 41 from the first position to the second position, the operator (guardian) operates the operating unit 72 to move the locking member 71 to the unlocked position. This prevents interference between the locking member 71 and the connecting member 60. This allows the operator (guardian) to move the seat support 41 to the second position. Once the seat support 41 is placed in the second position, the operation of the operating unit 72 is terminated. This causes the locking member 71 to move to the locked position by the biasing force of the biasing member 73. As the locking member 71 is maintained in the locked position by the biasing force of the biasing member 73, the seat support 41 is fixed in the second position.

[0073] When moving the seat support 41 from the second position to the first position, the operator (guardian) operates the operating unit 72 to move the locking member 71 to the unlocked position. This prevents interference between the locking member 71 and the connecting member 60. This allows the operator (guardian) to move the seat support 41 to the first position. Once the seat support 41 is placed in the first position, the operation of the operating unit 72 is terminated. This causes the locking member 71 to move to the locked position by the biasing force of the biasing member 73. As the locking member 71 is maintained in the locked position by the biasing force of the biasing member 73, the seat support 41 is fixed in the first position.

[0074] (1st and 2nd positions) In the illustrated example, the first and second positions of the seat support 41 are determined as follows. That is, as shown in Figs. 2 and 3, the first and second positions are determined so that when the seat support 41 is placed in the first position, the back and seat connection part A is located behind the rear legs 16 in a side view of the stroller body 11, and when the seat support 41 is placed in the second position, the back and seat connection part A is located in front of the rear legs 16. As a result, when the seat support 41 is placed in the first position, the distance in the front-rear direction between the grip part 33 of the handle 30 placed in the back pushing position and the back and seat connection part A is sufficiently short, and the operability of the stroller 10 is good. On the other hand, when the seat support 41 is placed in the second position, the distance between the operator (guardian) at the front of the stroller 10 and the seat support 41 becomes sufficiently short, and it is possible to effectively and easily get an infant on and off the seat support 41 and take care of the infant on the seat support 41. Furthermore, by placing the seat support 41 in the second position when the handle 30 is placed in the facing pushing position, the distance in the front-to-rear direction between the grip part 33 of the handle 30 and the seat-back connection part A can be sufficiently shortened, improving the maneuverability of the stroller 10. In other words, it is possible to effectively suppress changes in the distance in the front-to-rear direction between the position of the center of gravity of the baby on the stroller 10 and the grip part 33 of the handle 30 when the position of the handle 30 is changed, and it is possible to effectively suppress changes in the maneuverability of the stroller 10.

[0075] In the illustrated example, the first and second positions are determined so that the distance D1 (see FIG. 5) between the first and second positions of the seat support 41 in the front-rear direction is equal to or greater than one-fourth the distance D2 (see FIG. 5) between the front and rear legs 14 and 16 at the height position of the seat support 41 in the first position. This makes it possible to effectively and easily get an infant on and off the seat support 41 and to effectively take care of the infant on the seat support 41 when the seat support 41 is placed in the second position. In addition, when the position of the handle 30 is changed, the change in the distance between the position of the center of gravity of the infant on the stroller 10 and the grip 33 of the handle 30 in the front-rear direction can be effectively suppressed, and the change in the operability of the stroller 10 can be effectively suppressed.

[0076] In the illustrated example, the first and second positions of the seat support 41 are determined as follows: That is, in a side view of the stroller body 11, the seat back connection part A when the seat support 41 is arranged at the second position is at least one-fourth of the front-rear distance D3 (see FIG. 3) between the connection part of the rear leg 16 and the rear wheel holding member 19a and the connection part of the front leg 14 and the front wheel holding member 18a, and is located forward of the connection part of the rear leg 16 and the rear wheel holding member 19a (in other words, the front-rear distance D4 (see FIG. 3) between the connection part of the rear leg 16 and the rear wheel holding member 19a when the seat support 41 is arranged at the second position is at least one-fourth of the above-mentioned distance D3). As a result, when the seat support 41 is placed in the second position, the distance between the seat support 41 and the operator (guardian) at the front of the stroller 10 becomes sufficiently short, effectively facilitating the loading and unloading of an infant onto and from the seat support 41 and the care of an infant on the seat support 41. In addition, when the position of the handle 30 is switched, it is possible to effectively prevent changes in the front-to-rear distance between the center of gravity of an infant on the stroller 10 and the grip portion 33 of the handle 30, effectively preventing changes in the operability of the stroller 10.

[0077] In the illustrated example, the first and second positions of the seat support 41 are determined as follows. That is, the first and second positions are determined so that the distance D1 (see FIG. 5) between the first and second positions in the front-rear direction is at least twice the horizontal distance D5 (see FIG. 3) between the front wheel pivot shaft 18c and the front wheel pivot shaft 18b in a plane perpendicular to the front wheel pivot shaft 18b. When the front wheel holding member 18a pivots around the front wheel pivot shaft 18c, the position of the front wheel pivot shaft 18b relative to the front wheel pivot shaft 18c changes between the case where the stroller 10 is operated with the handle 30 in the rear-pushing position and the case where the stroller 10 is operated with the handle 30 in the front-pushing position, as shown in FIG. 2 and FIG. 3. In the illustrated example, when the stroller 10 is operated with the handle 30 in the rear-pushing position, the front wheel pivot shaft 18b is located behind the front wheel pivot shaft 18c. In contrast, when the stroller 10 is operated with the handle 30 in the forward-pushing position, the front wheel rotation shaft 18b is located in front of the front wheel swivel shaft 18c. When the operator of the stroller 10 operates the stroller 10 with the handle 30 in the forward-pushing position, the operator operates the stroller 10 using the front wheel rotation shaft 18b as a fulcrum. In such a stroller in which the front wheels 18 swivel, if the front-to-rear position of the seat support body 41 does not change, the front-to-rear distance between the front wheel rotation shaft 18b and the backseat connection part A when the stroller is operated with the handle 30 in the forward-to-rear pushing position is twice the above-mentioned distance D5 larger than the front-to-rear distance between the front wheel rotation shaft 18b and the backseat connection part A when the stroller is operated with the handle 30 in the forward-to-rear pushing position. Therefore, in the illustrated example, by making the distance D1 in the front-rear direction between the first position and the second position of the seat support 41 at least twice the distance D5, it is possible to cancel the change in the distance in the front-rear direction between the front wheel rotation shaft 18b and the seat-back connection part A caused by the turning of the front wheels 18. This makes it possible to suppress the change in the operability of the stroller 10 caused by the turning of the front wheels 18.

[0078] <<Modifications>> Next, various modified examples of this embodiment will be described with reference to Figures 9 to 15. In Figures 9 to 15, the same parts as those in the embodiment shown in Figures 1 to 8 are given the same reference numerals and detailed description thereof will be omitted.

[0079] <Variation 1> The locking mechanism 70 may fix the seat support 41 to the main frame 12 when the seat support 41 reaches the second position from the first position side, or when the seat support 41 reaches the first position from the second position side. In other words, the locking mechanism 70 does not need to fix the seat support 41 to the main frame 12 while the seat support 41 is between the first position and the second position.

[0080] Fig. 9 is a cross-sectional view of the right half of the stroller body 11 as viewed from the inside. Fig. 10 is a cross-sectional view taken along line XX in Fig. 9. For the sake of simplicity, the front legs 14, rear legs 16, handle 30, and second link member L2 are omitted from Fig. 10. Figs. 11A to 11C are side views of the lock mechanism 70 according to the example shown in Figs. 9 and 10.

[0081] In the example shown in Figs. 9 to 11C, the stroller body 11 has a rear lock mechanism 75 and a front lock mechanism 76. Each of the lock mechanisms 75, 76 has a base 77 fixed to the third link member L3 and a hook 78 connected to the base 77. The hook 78 is rotatable around a rotation axis extending in the width direction relative to the base 77. The hook 78 has a main body 78a extending in the front-rear direction and an extension 78b extending downward from the main body 78a. The main body 78a of the rear lock mechanism 75 is connected to the base 77 at its rear end, and the extension 78b extends from its front end. The main body 78a of the front lock mechanism 76 is connected to the base 77 at its front end, and the extension 78b extends from its rear end. An inclined surface 79 is formed at the lower end of the extension 78b. The inclined surface 79 of the rear locking mechanism 75 faces forward and is inclined downward as it approaches the rear. The inclined surface 79 of the front locking mechanism 76 faces rear and is inclined downward as it approaches the front. The hooks 78 of the rear locking mechanism 75 are urged in the counterclockwise direction in FIG. 9 by a biasing member (not shown). The hooks 78 of the front locking mechanism 76 are urged in the clockwise direction in FIG. 9 by a biasing member (not shown). In FIG. 9, the tip of the extension portion 78b of each hook 78 is pressed against the third link member L3 by the biasing force of the biasing member.

[0082] The seat support 41 has a rear engagement portion 81 and a front engagement portion 82. The rear engagement portion 81 and the front engagement portion 82 are engageable with the hooks 78 of the rear lock mechanism 75 and the front lock mechanism 76, respectively. In the illustrated example, each engagement portion 81, 82 is formed in a substantially U-shape. Both ends of the U-shape of the rear engagement portion 81 are fixed to the rear end portion of the rear connecting member 61. The rear engagement portion 81 extends rearward from the rear end portion of the rear connecting member 61. Both ends of the U-shape of the front engagement portion 82 are fixed to the front end portion of the front connecting member 62. The front engagement portion 82 extends forward from the front end portion of the front connecting member 62.

[0083] In the stroller body 11 having such locking mechanisms 75, 76 and engaging parts 81, 82, when the seat support 41 is moved in a direction from the first position toward the second position, the front engaging part 82 comes into contact with the inclined surface 79 of the hook 78 of the front locking mechanism 76, as shown in Fig. 11A. When the seat support 41 is further moved in a direction toward the second position, the front engaging part 82 pushes up the inclined surface 79 of the hook 78 of the front locking mechanism 76, as shown in Fig. 11B, and the hook 78 rotates in a direction in which the extension part 78b moves away from the third link member L3 (counterclockwise direction in Fig. 11B). As a result, the front engaging part 82 moves between the extension part 78b and the base part 77 through between the hook 78 and the third link member L3. When the front engagement portion 82 moves between the extension portion 78b and the base portion 77, the hook 78 rotates in a direction (clockwise direction in FIG. 11B) in which the extension portion 78b approaches the third link member L3 due to the biasing force of the biasing member. As a result, as shown in FIG. 11C, the extension portion 78b abuts against the third link member L3. This causes the extension portion 78b to be disposed between the front engagement portion 82 and the front connecting member 62, and the seat support body 41 is fixed in the first position.

[0084] On the other hand, when the seat support 41 is moved in a direction from the second position toward the first position, the rear engagement portion 81 comes into contact with the inclined surface 79 of the hook 78 of the rear lock mechanism 75 as shown in FIG. 11A. When the seat support 41 is further moved in a direction toward the first position, the rear engagement portion 81 pushes up the inclined surface 79 of the hook 78 of the rear lock mechanism 75 as shown in FIG. 11B, and the hook 78 rotates in a direction in which the extension portion 78b moves away from the third link member L3 (counterclockwise direction in FIG. 11B). As a result, the rear engagement portion 81 passes between the hook 78 and the third link member L3 and moves between the extension portion 78b and the base portion 77. When the rear engagement portion 81 moves between the extension portion 78b and the base portion 77, the hook 78 rotates in a direction in which the extension portion 78b approaches the third link member L3 (clockwise direction in FIG. 11B) due to the biasing force of the biasing member. 11C, the extension 78b comes into contact with the third link member L3. This causes the extension 78b to be disposed between the rear engagement portion 81 and the rear connecting member 61, and the seat support body 41 is fixed in the second position.

[0085] In the illustrated example, when the seat support 41 is in the first position, the rear engagement portion 81 engages with the rear locking mechanism 75 and the front engagement portion 82 does not engage with the front locking mechanism 76. On the other hand, when the seat support 41 is in the second position, the rear engagement portion 81 does not engage with the rear locking mechanism 75 and the front engagement portion 82 engages with the front locking mechanism 76.

[0086] In the illustrated example, when the seat support 41 in the first position is to be moved to the second position, the hook 78 of the rear lock mechanism 75 is operated (rotated counterclockwise in FIG. 11C) to move the extension 78b away from the third link member L3, and then the seat support 41 is moved to the second position. When the seat support 41 in the second position is to be moved to the first position, the hook 78 of the front lock mechanism 76 is operated (rotated counterclockwise in FIG. 11C) to move the extension 78b away from the third link member L3, and then the seat support 41 is moved to the first position.

[0087] <Variation 2> In the above example, the fixing of the seat support 41 to the main frame 12 by the locking mechanism 70 is manually released, but this is not limited to the above. The fixing of the seat support 41 to the main frame 12 by the locking mechanism 70 may be released in conjunction with the swinging of the handle 30. In this case, the fixing of the seat support 41 to the main frame 12 by the locking mechanism 70 can be automatically released when the handle 30 is swung from the back pressing position to the face-to-face pressing position, or when the handle 30 is swung from the face-to-face pressing position to the back pressing position.

[0088] Such a lock mechanism 70 can be realized, for example, by connecting the lock member 71 and the hook 78 to the handle 30. Alternatively, such a lock mechanism 70 can be realized, for example, by connecting the lock member 71 and the hook 78 to the holder 35.

[0089] Alternatively, such a locking mechanism 70 can be realized, for example, by the following method. First, the locking member 71 and the hook 78 are connected to a switch attached to the main body frame 12. The locking member 71 and the hook 78 are connected to the switch so that they are operated when the switch is pressed. The switch is also arranged on the main body frame 12 so that the switch interferes with the handle 30 and is pressed down when the handle 30 is swung relative to the main body frame 12. With such a locking mechanism 70, the fixation of the seat support 41 to the main body frame 12 by the locking mechanism 70 can also be automatically released when the handle 30 is swung.

[0090] <Modification 3> In the above-mentioned example, the seat support 41 moves in the front-rear direction while being guided by the third link member L3, but this is not limited thereto. The seat support 41 may move in the front-rear direction while being guided by a link member (for example, the first link member L1) other than the third link member L3 among the link members 14, 16, L1 to L4 that configure the main frame 12 to be foldable. The seat support 41 may also move in the front-rear direction while being guided by a member of the main frame 12 other than the above-mentioned link members. When the seat support 41 is supported by the first link member L1, the seat support 41 may be disposed between the first link members L1 or above the first link member L1.

[0091] <Modification 4> In the above-mentioned example, the seat support 41 is slidable linearly on the main body frame 12, but is not limited to this. The seat support 41 may be attached to the main body frame 12 so as to be swingable in the front-rear direction. This modification will be described with reference to Figs. 12 and 13. Figs. 12 and 13 are cross-sectional views showing a schematic view of the right half of the stroller body 11 as viewed from the inside in the width direction. In Fig. 12, the seat support 41 is disposed in a first position. In Fig. 13, the seat support 41 is disposed in a second position.

[0092] In the example shown in FIG. 12 and FIG. 13, the connecting member 60 connecting the seat support 41 and the main body frame 12 is a link member. In this example, the stroller body 11 includes a rear connecting member 66 and a front connecting member 67. Each connecting member 66, 67 is connected to the main body frame 12 at one end. Each connecting member 66, 67 is rotatable relative to the main body frame 12 around a rotation axis extending in the width direction. Each connecting member 66, 67 is connected to the seat support 41 at the other end. Each connecting member 66, 67 is rotatable relative to the seat support 41 around a rotation axis extending in the width direction. In the illustrated example, each connecting member 66, 67 is connected to the first link member L1 at one end. One end of each connecting member 66, 67 is immovable in the front-rear direction relative to the main body frame 12. The other end of each connecting member 66, 67 is immovable in the front-rear direction relative to the seat support 41.

[0093] In this stroller 10 as well, by rotating the connecting members 66, 67 relative to the main body frame 12 and the seat support body 41, the position of the seat support body 41 on the main body frame 12 can be changed in the front-rear direction.

[0094] In the example shown in Figs. 12 and 13, the locking mechanism 70 can fix the connecting members 66, 67 to the main body frame 12. Such a stroller 10 reduces the risk of the seat support 41 unintentionally swinging relative to the main body frame 12. In the locking mechanism 70 shown in Figs. 12 and 13, the locking member 71 can move between a locked position that restricts the connecting members 66, 67 from rotating relative to the main body frame 12 and an unlocked position that allows the connecting members 66, 67 to rotate relative to the main body frame 12. The locking member 71 is biased to the locked position by a biasing member. The locking member 71 can be moved from the locked position to the unlocked position by operating an operating unit 72.

[0095] 12 and 13, the fixing of the seat support body 41 to the main body frame 12 by the locking mechanism 70 may also be released manually or in conjunction with the swinging of the handle 30.

[0096] <Variation 6> In the example shown in Figures 12 and 13, one end of each of the connecting members 66, 67 is connected to the first link member L1, but this is not limited to the above. As shown in Figures 14 and 15, one end of each of the connecting members 66, 67 may be rotatably connected to the third link member L3. In this stroller 10 as well, the position of the seat support 41 on the main frame 12 can be changed in the front-rear direction by rotating the connecting members 66, 67 relative to the main frame 12 and the seat support 41.

[0097] 14 and 15, the stroller body 11 may have a rocking restriction part 85 that restricts the rocking range of the seat support 41 and the connecting members 66, 67. In the example shown in FIG. 14 and FIG. 15, the rocking restriction part 85 abuts against the front connecting member 67 when the seat support 41 is in the first position, and restricts the seat support 41 and the connecting members 66, 67 from rocking further backward and / or downward. Also, the rocking restriction part 85 abuts against the rear connecting member 66 when the seat support 41 is in the second position, and the seat support 41 and the connecting members 66, 67 rock further forward and / or downward. When the stroller body 11 has the rocking restriction part 85, the stroller body 11 does not need to include the lock mechanism 70.

[0098] <Variation 7> In the above example, the seat support body 41 is movable together with the back support body 45, the top support body 57, and the guard material 55, but is not limited to this. The seat support body 41 does not have to be movable together with at least one of the back support body 45, the top support body 57, and the guard material 55. For example, at least one of the back support body 45, the top support body 57, and the guard material 55 may be immovable in the front-rear direction relative to the main body frame 12.

[0099] <Variation 8> The handle 30 may be attached to the main body frame 12 so as not to be able to swing in the front-rear direction.

[0100] The stroller 10 of the embodiment and the modified example thereof described above includes a stroller body 11. The stroller body 11 includes a body frame 12, a seat support unit 40 held by the body frame 12, and a handle 30. The handle 30 is attached to the body frame 12 so as to be able to swing in the front-rear direction. The seat support unit 40 includes a seat support 41. The position of the seat support 41 on the body frame 12 can be changed in the front-rear direction. With this stroller 10, by moving the seat support 41 in the front-rear direction when changing the position of the handle 30, it is possible to suppress a change in the front-rear distance between the grip part (middle part 33) of the handle 30 and the center of gravity of the baby caused by changing the position of the handle 30. This makes it possible to suppress a change in the operability of the stroller 10 caused by changing the position of the handle 30. In addition, with such a stroller 10, by moving the seat support 41 forward relative to the main frame 12, it becomes easier to load and unload an infant onto and from the seat support 41, and to care for an infant on the seat support 41.

[0101] In the embodiment and its modified example described above, the main body frame 12 includes a locking mechanism 70 that can fix the seat support 41 to the main body frame 12. With such a stroller 10, the risk of the seat support 41 moving unintentionally relative to the main body frame 12 is reduced.

[0102] In the embodiment and its modified example described above, the seat support 41 is movable between a first position and a second position forward of the first position. The lock mechanism 70 fixes the seat support 41 at the first position or the second position. With such a stroller 10, the risk of the seat support 41 unintentionally moving from the first position or the second position is suppressed. In addition, by disposing the seat support 41 at the first position when the handle 30 is disposed at the rear pushing position, and disposing the seat support 41 at the second position when the handle 30 is disposed at the front pushing position, the stroller 10 can be realized with good operability both when the handle 30 is disposed at the rear pushing position and when the handle 30 is disposed at the front pushing position.

[0103] In the modified example described above, the locking mechanism 70 fixes the seat support 41 to the main frame 12 when the seat support 41 reaches the second position from the first position side, or when the seat support 41 reaches the first position from the second position side.

[0104] In the modified example described above, the main body frame 12 includes a locking mechanism 70 capable of fixing the seat support 41 to the main body frame 12. As the handle 30 swings, the locking mechanism 70 can release the seat support 41 from being fixed to the main body frame 12. With this stroller 10, when the handle 30 is swinged, the locking mechanism 70 can automatically release the seat support 41 from being fixed to the main body frame 12.

[0105] In the modified example described above, the handle 30 can be swung between a back pressing position and a front pressing position. When the handle 30 is moved from the back pressing position to the front pressing position, or when the handle 30 is moved from the front pressing position to the back pressing position, the lock mechanism 70 can release the seat support 41 from the main frame 12.

[0106] In the embodiment described above, the main body frame 12 includes the front legs 14 and the rear legs 16. The seat support 41 is movable between a first position and a second position forward of the first position. In a side view of the stroller body 11, the distance D1 in the front-rear direction between the first position and the second position is equal to or more than one-fourth the distance D2 between the front legs 14 and the rear legs 16 at the height position of the seat support 41 in the first position. With this stroller 10, the change in the front-rear distance between the center of gravity of the baby on the stroller 10 and the grip part 33 of the handle 30 caused by changing the position of the handle 30 can be effectively suppressed, and the change in the operability of the stroller 10 can be effectively suppressed. Furthermore, with this type of stroller 10, when the seat support 41 is positioned in the second position, the distance between the operator (guardian) at the front of the stroller 10 and the seat support 41 becomes sufficiently close, making it easy to effectively load and unload an infant onto and from the seat support 41, and to care for an infant on the seat support 41.

[0107] In the embodiment and its modified example described above, the seat support unit 40 includes the back support 45. The back support 45 is movable together with the seat support 41. According to such a stroller 10, even if the position of the seat support 41 in the front-rear direction relative to the main frame 12 changes, the positional relationship between the seat support 41 and the back support 45 is maintained. Therefore, the riding comfort of the stroller 10 is suppressed from changing before and after changing the position of the seat support 41 in the front-rear direction. In addition, since the back support 45 moves together with the seat support 41, when the seat support 41 is moved, not only the center of gravity of the seat support 41 but also the center of gravity of the back support 45 moves. As a result, the center of gravity of the seat support unit 40 can be effectively moved in the front-rear direction with the movement of the seat support 41. As a result, by moving the seat support 41 when changing the position of the handle 30, changes in the fore-and-aft distance between the center of gravity of the seat support unit 40 and the grip portion 33 of the handle 30 can be effectively prevented, and changes in the operability of the stroller 10 can be effectively prevented.

[0108] In the embodiment and its modified example described above, the main body frame 12 includes the front legs 14 and the rear legs 16. The back support 45 is connected to the seat support 41. In a side view of the stroller main body 11, the seat support unit 40 is movable between a first position where a connection part A between the seat support 41 and the back support 45 is behind the rear legs 16, and a second position where the connection part A is in front of the rear legs 16. According to this stroller 10, by moving the seat support 41 when changing the position of the handle 30, it is possible to effectively suppress the change in the distance in the front-rear direction between the center of gravity of the baby on the stroller 10 and the grip part 33 of the handle 30, and it is possible to effectively suppress the change in the operability of the stroller 10. Furthermore, with this type of stroller 10, when the seat support 41 is positioned in the second position, the distance between the operator (guardian) at the front of the stroller 10 and the seat support 41 becomes sufficiently close, making it easy to effectively load and unload an infant onto and from the seat support 41, and to care for an infant on the seat support 41.

[0109] In the embodiment and its modified example described above, the main body frame 12 includes the front legs 14, the front wheel holding member 18a, the front wheels 18, the rear legs 16, the rear wheel holding member 19a, and the rear wheels 19. The front wheel holding member 18a is connected to the front legs 14. The front wheels 18 are held by the front wheel holding member 18a so as to be rotatable around the front wheel rotation shaft 18b extending in the horizontal direction. The rear wheel holding member 19a is connected to the rear legs 16. The rear wheels 19 are held by the rear wheel holding member 19a so as to be rotatable around the rear wheel rotation shaft 19b extending in the horizontal direction. The seat support unit 40 includes a back support 45 connected to the seat support 41. The seat support 41 is movable between a first position and a second position forward of the first position. In a side view of the stroller body 11, when the seat support 41 is arranged in the second position, the front-to-rear position of the connection part A of the seat support 41 and the back support 45 is more than one-fourth of the front-to-rear distance D3 between the connection part of the front legs 14 and the front wheel holding member 18a and the connection part of the rear legs 16 and the rear wheel holding member 19a, and is forward of the connection part of the rear legs 16 and the rear wheel holding member 19a. With this stroller 10, by moving the seat support 41 when changing the position of the handle 30, it is possible to effectively suppress changes in the front-to-rear distance between the center of gravity of the baby on the stroller 10 and the grip part 33 of the handle 30, and it is possible to effectively suppress changes in the operability of the stroller 10. Furthermore, with this type of stroller 10, when the seat support 41 is positioned in the second position, the distance between the operator (guardian) at the front of the stroller 10 and the seat support 41 becomes sufficiently close, making it easy to effectively load and unload an infant onto and from the seat support 41, and to care for an infant on the seat support 41.

[0110] In the embodiment and its modified example described above, the main body frame 12 includes the front legs 14, the front wheel holding member 18a, and the front wheels 18. The front wheel holding member 18a is connected to the front legs 14. The front wheels 18 are held by the front wheel holding member 18a so as to be rotatable around the front wheel rotation shaft 18b extending in the horizontal direction. The seat support 41 is movable between a first position and a second position forward of the first position. The front wheels 18 are rotatable around the front wheel pivot shaft 18c extending in the vertical direction. A distance D1 in the front-rear direction between the first position and the second position is at least twice the horizontal distance D5 between the front wheel pivot shaft 18c and the front wheel rotation shaft 18b in a plane perpendicular to the front wheel rotation shaft 18b. With this stroller 10, the change in the front-to-rear distance between the front wheel rotation axis 18b and the center of gravity of the baby on the seat support 41 caused by the turning of the front wheels 18 can be countered by the movement of the seat support 41. This makes it possible to suppress changes in the operability of the stroller 10 caused by the turning of the front wheels 18.

[0111] In the embodiment and its modified example described above, the seat support body 41 is movable in the front-rear direction along the guide rail L3 provided on the main body frame 12.

[0112] In the embodiment and its modified example described above, the main body frame 12 includes a first link member L1, a front leg 14, a rear leg 16, a second link portion L2, and a third link member L3. The front leg 14 is connected to the first link member L1 and is rotatable relative to the first link member L1. The rear leg 16 is connected to the first link member L1 and is rotatable relative to the first link member L1. The second link member L2 is connected to the first link member L1 and is rotatable relative to the first link member L1. The third link member L3 is provided between the front leg 14 and the second link member L2 and is rotatable relative to the front leg 14 and the second link member L2. The third link member L3 guides the movement of the seat support 41 in the front-rear direction.

[0113] In the embodiment and its modified example described above, the main body frame 12 includes link members L1-L4, 14, and 16 that configure the main body frame 12 to be foldable and unfoldable. Any of the link members L1-L4, 14, and 16 guides the movement of the seat support body 41.

[0114] In the modified example described above, the seat support 41 is attached to the main body frame 12 so as to be swingable in the front-rear direction.

[0115] In the embodiment and its modified example described above, the seat support unit 40 includes a top support 57. The top support 57 is movable together with the seat support 41. With such a stroller 10, even if the position of the seat support 41 in the front-rear direction relative to the main frame 12 changes, the positional relationship between the seat support 41 and the top support 57 (hence the top) is maintained. Even if the position of the seat support 41 in the front-rear direction changes, a sunshade environment can be appropriately provided for the baby on the seat support unit 40. In addition, since the top support 57 moves together with the seat support 41, when the seat support 41 is moved, not only the center of gravity of the seat support 41 but also the center of gravity of the top support 57 moves. As a result, the center of gravity of the seat support unit 40 can be effectively moved in the front-rear direction along with the movement of the seat support 41. As a result, by moving the seat support 41 when changing the position of the handle 30, changes in the fore-and-aft distance between the center of gravity of the seat support unit 40 and the grip portion 33 of the handle 30 can be effectively prevented, and changes in the operability of the stroller 10 can be effectively prevented.

[0116] In the embodiment and its modified example described above, the seat support unit 40 includes a guard material 55. The guard material 55 is movable together with the seat support 41. With such a stroller 10, even if the position of the seat support 41 in the front-rear direction relative to the main frame 12 changes, the positional relationship between the seat support 41 and the guard material 55 is maintained. Therefore, even if the position of the seat support 41 in the front-rear direction changes, the baby on the seat support unit 40 can be appropriately guarded by the guard material 55.

[0117] Although several modifications to the above-mentioned embodiment have been described, it is of course possible to apply a plurality of modifications in appropriate combination. [Explanation of symbols]

[0118] 10. Pram 11 Baby carriage body 12 Main frame 14 Front legs 16 Hind Legs 18 Front wheel 18b Front wheel axle 18c Front wheel pivot 19 Rear wheel 19b Rear wheel pivot 19c Rear wheel rotation axis 20 Shaft member 30 Handle 32 Handle extension 40 Seat support unit 41 Seat support 45 Back support 60 Connecting member 61 Rear connecting member 62 Front connecting member 70 Locking mechanism 71 Locking member 75 Rear lock mechanism 76 Front lock mechanism 78 Hook 81 Rear engaging part 82 Front engagement part L1 First link member L2 Second link member L3 Third link member L4 Fourth link member

Claims

1. A stroller including a stroller body, The stroller body is A body frame, a seat support unit held by the main body frame; A handle attached to the main body frame so as to be swingable in the front-rear direction; Including, The seat support unit includes a seat support, A stroller, wherein the position of the seat support on the main body frame is changeable in the front-rear direction.

2. The stroller according to claim 1 , wherein the main body frame includes a locking mechanism capable of fixing the seat support to the main body frame.

3. The seat support is movable between a first position and a second position forward of the first position, 3. A pram as claimed in claim 2, wherein the locking mechanism secures the seat support in either the first position or the second position.

4. 4. The stroller of claim 3, wherein the locking mechanism fixes the seat support to the main frame when the seat support reaches the second position from the side of the first position, or when the seat support reaches the first position from the side of the second position.

5. the main body frame includes a locking mechanism capable of fixing the seat support to the main body frame, The stroller according to claim 1, wherein the seat support is released from the main body frame by the locking mechanism in response to a swinging movement of the handle.

6. The handle can be pivoted between a back pressing position and a front pressing position, 6. The stroller of claim 5, wherein when the handle is moved from the rear pushing position toward the forward pushing position, or when the handle is moved from the forward pushing position toward the rear pushing position, the locking mechanism can release the seat support from being fixed to the main frame.

7. The body frame includes front legs and rear legs, The seat support is movable between a first position and a second position forward of the first position; 2. The stroller of claim 1, wherein, when viewed from the side, the longitudinal distance between the first position and the second position is at least one-fourth the distance between the front legs and the rear legs at the height position of the seat support in the first position.

8. The seat support unit includes a back support; 2. A stroller as claimed in claim 1, wherein the back support is moveable with the seat support.

9. The body frame includes front legs and rear legs, the back support is connected to the seat support; 9. The stroller of claim 8, wherein, in a side view, the seat support unit is movable between a first position in which a connection portion between the seat support and the back support is behind the rear legs, and a second position in which the connection portion is in front of the rear legs.

10. The main body frame includes: The front legs and A front wheel holding member connected to the front leg; a front wheel held by the front wheel holding member so as to be rotatable around a front wheel rotation axis extending in a horizontal direction; The hind legs and A rear wheel holding member connected to the rear leg; a rear wheel held by the rear wheel holding member so as to be rotatable around a rear wheel rotation axis extending in a horizontal direction; Including, The seat support is movable between a first position and a second position forward of the first position; the back support is connected to the seat support; 9. The stroller of claim 8, wherein, when viewed from the side, the fore-and-aft position of the connection between the seat support and the back support when the seat support is positioned in the second position is at least a quarter of the fore-and-aft distance between the connection between the front legs and the front wheel retaining member and the connection between the rear legs and the rear wheel retaining member, and is forward of the connection between the rear legs and the rear wheel retaining member.

11. The main body frame includes: The front legs and A front wheel holding member connected to the front leg; a front wheel held by the front wheel holding member so as to be rotatable around a front wheel rotation axis extending in a horizontal direction; Including, The seat support is movable between a first position and a second position forward of the first position; The front wheel holding member is rotatable about a front wheel pivot axis extending in a vertical direction, 2. The stroller of claim 1, wherein the front-to-rear distance between the first position and the second position is at least twice the horizontal distance between the front wheel pivot axis and the front wheel rotation axis in a plane perpendicular to the front wheel rotation axis.

12. 2. The stroller according to claim 1, wherein the seat support is movable in the front-rear direction along a guide rail provided on the main body frame.

13. The main body frame includes: A first link member; a front leg connected to the first link member and rotatable relative to the first link member; a rear leg connected to the first link member and rotatable relative to the first link member; a second link member connected to the first link member and rotatable relative to the first link member; a third link member provided between the front leg and the second link member and rotatable relative to the front leg and the second link member; having The stroller according to claim 1 , wherein the third link member guides the movement of the seat support in the front-rear direction.

14. The main body frame includes a link member that configures the main body frame to be foldable and unfoldable, 2. A stroller as claimed in claim 1, wherein any of the link members guides the movement of the seat support.

15. 2. The stroller according to claim 1, wherein the seat support is attached to the main frame so as to be swingable in the front-rear direction.

16. The seat support unit includes a top support, 2. A stroller as claimed in claim 1, wherein the top support is movable together with the seat support.

17. The seat support unit includes a guard material, 2. A stroller as claimed in claim 1, wherein the guard material is moveable with the seat support.

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