Folding stroller

Abstract

To provide a foldable stroller that can be easily unfolded / folded with a simple configuration.SOLUTION: A foldable stroller differs in a form between an unfolded state and a folded state. The foldable stroller includes: a first member (13); a second member (23) connected to the first member (13) via a rotary shaft (28), with a bending angle relative to the first member (13) changing according to a folding operation from the unfolded state to the folded state and an unfolding operation from the folded state to the unfolded state; and a torsion spring (40) that is urged in a direction in which bending angles of the first member (13) and the second member (23) mounted on the rotary shaft (28) are increased or decreased.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a foldable stroller that has different configurations when unfolded and when folded. [Background technology]

[0002] 2. Description of the Related Art Conventionally, foldable strollers are known that are unfolded into an unfolded state when in use and retracted into a folded state when not in use.

[0003] Japanese Patent Laid-Open Publication No. 9-48352 (Patent Document 1) discloses a configuration in which a tension spring and a compression spring arranged in series along the rear legs assist both the folding and unfolding of a stroller. Also, Japanese Patent Laid-Open Publication No. 2001-239942 (Patent Document 2) discloses a configuration in which a spring provided between the rear end of the seat and the rear legs provides folding elasticity, assisting the stroller in moving from an unfolded state to a folded state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-48352 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-239942 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the folding strollers disclosed in the above Patent Documents 1 and 2 are assisted in the opening and closing operations of the folding and unfolding operations, they have a large number of parts and a complex structure.

[0006] The present invention has been made to solve the above-mentioned problems, and its object is to provide a foldable stroller that has a simple structure and can be easily opened and closed. [Means for solving the problem]

[0007] For this purpose, one embodiment of the present invention provides a folding stroller that has different shapes in an unfolded state and a folded state, and comprises a first member, a second member that is connected to the first member via a pivot shaft and whose bending angle relative to the first member changes as the stroller is folded from the unfolded state to the folded state, or as the stroller is unfolded from the folded state to the unfolded state, and a torsion spring that is attached to the pivot shaft and biases the first member and second member in a direction that increases or decreases the bending angle.

[0008] Preferably, the first member is a rear leg that extends vertically and has a wheel at its lower end, and the second member is an inverted bracket that has one end rotatably connected to the rear leg and the other end rotatably connected to the lower end of the handrail support member, and that rotates in response to changes in shape.

[0009] Preferably, the first member is a seat support member that supports the seat, and the second member is a front leg that has a wheel at its lower end and extends in the vertical direction.

[0010] Preferably, the first member is a rear leg having a wheel at its lower end and extending in the vertical direction, and the second member is a front leg having a wheel at its lower end and extending in the vertical direction.

[0011] Preferably, the first member is a rear leg that has a wheel at its lower end and extends in the vertical direction, the second member is an additional member that abuts against the body frame that constitutes the stroller and moves downward as the stroller is folded, and the torsion spring urges the second member upward. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a foldable stroller that has a simple structure and can be easily opened and closed. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a right side view showing a foldable stroller according to a first embodiment of the present invention. [Figure 2]1A and 1B are schematic diagrams of a foldable stroller according to a first embodiment of the present invention, in which (A) shows the unfolded state and (B) shows the folded state. [Figure 3] 1 is a diagram showing a transition from an unfolded state to a folded state of the foldable stroller according to the first embodiment of the present invention. [Figure 4] 2A and 2B are enlarged views of part A in FIG. 1, in which (A) is a perspective view, (B) is a view showing the unfolded state, and (C) is a view showing the folded state. [Figure 5] 2A and 2B are enlarged views of part B in FIG. 1, where (A) is a perspective view, (B) is a view showing the unfolded state, and (C) is a view showing the folded state. [Figure 6] 2A and 2B are enlarged views of part C in FIG. 1, in which (A) shows the unfolded state and (B) shows the folded state. [Figure 7] FIG. 10 is a right side view showing a foldable stroller according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a front view showing a folding stroller according to a second embodiment of the present invention. [Figure 9] 8A and 8B are enlarged views of part D in FIG. 7, where (A) shows the unfolded state, (B) shows the intermediate state from the unfolded state to the folded state, and (C) shows the folded state. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which like reference numerals denote like or corresponding parts and will not be described repeatedly.

[0015] (About the stroller) An overview of a foldable stroller 1 according to this embodiment will be described with reference to Figures 1 to 3. Figure 1 is a right side view showing a foldable stroller according to the first embodiment of the present invention. Figures 2 and 3 are simplified views of Figure 1. Figure 2(A) is a view showing the unfolded state corresponding to Figure 1, and Figure 2(B) is a view showing the folded state. Figure 3 is a view showing the transition from the unfolded state to the folded state. To facilitate understanding of the invention, the drawings mainly show the body frame of the back-to-face switchable stroller, and omit illustrations of an infant seat, a canopy, etc. In the following description, the front-to-rear direction corresponds to the front-to-rear direction of the stroller, and the left-to-right direction corresponds to the left-to-right direction when viewed from the front of the stroller.

[0016] The folding stroller 1 of this embodiment comprises a body frame 10, which includes a pair of front legs 11, a pair of rear legs 13, armrests 15, armrest support members 17, seat support members 18, backrest support members 19, and a reversing bracket 23. The body frame 10, excluding the seat support members 18 and backrest support members 19, is provided on the left and right sides and spaced apart in the width direction (vehicle width direction), forming a pair. A front wheel 12 is provided at the lower end of each front leg 11 extending in the vertical direction. A rear wheel 14 is provided at the lower end of each rear leg 13 extending in the vertical direction behind each front leg 11.

[0017] The upper ends of the front legs 11 and the rear legs 13 are rotatably connected to the front ends of the armrests 15 extending in the front-to-rear direction of the foldable stroller 1 via first rotating shafts 24. In other words, the first rotating shafts 24 rotatably connect the three members, the front legs 11, the rear legs 13, and the armrests 15.

[0018] The rear end of the armrest 15 is rotatably connected to the upper end of an armrest support member 17 that extends in the vertical direction via a second rotation shaft 25. Specifically, the rear end of the armrest 15 and the upper end of the armrest support member 17 are also connected to the hood 30 via the second rotation shaft 25. Note that the armrest support member 17 almost overlaps with the push bar 20 in the right side view of FIG. 1.

[0019] A front guard 16 is provided inside the pair of armrests 15. The front guard 16 is provided in front of the seat and extends across the seat in the width direction. Both widthwise ends of the front guard 16 are connected to the rear ends of the seat support members 18.

[0020] A seat support member 18 is disposed below the armrest 15. The front end of the seat support member 18 is connected to the center of the pair of front legs 11. The front end of the seat support member 18 is rotatably connected to the pair of front legs 11 via a third rotation shaft 26.

[0021] The rear end of the seat support member 18, the lower end of the push rod 20, the upper end of the reversing bracket 23, and the lower end of the armrest support member 17 are rotatably connected via a fourth pivot shaft 27. The rear end of the seat support member 18 is rotatably connected to the lower end of the backrest support member 19 at a position different from the fourth pivot shaft 27. The seat support member 18 supports the seat of the infant from below, and the backrest support member 19 supports the backrest of the infant from below. Although not shown, a hammock is hung between the seat support member 18 and the backrest support member 19, and a cushion is attached to the hammock. As a result, a seat surface that forms the seat is formed on the seat support member 18, and the seat support member 18 supports the seat surface from below.

[0022] The push bar 20 is mounted on the body frame 10 so as to be swingable in the front-to-rear direction, and can be switched between a rear-pushing position (shown by a solid line in FIG. 1) and a front-pushing position (shown by a dashed-dotted line in FIG. 1). The push bar 20 is generally inverted U-shaped and includes a pair of vertical members 20a extending vertically and a horizontal member 20b connecting the upper ends of the pair of vertical members 20a. An operating part 20c is provided in the longitudinal center of the horizontal member 20b for unlocking the unfolding and folding operations. To perform the unfolding and folding operations, the push bar 20 needs to be moved upward or downward while operating this operating part 20c.

[0023] Although the push rod 20 is connected to the fourth pivot shaft 27, if it cannot be switched to a facing-back position, it may be connected to the rear end of the armrest 15 and extend upward.

[0024] The inverting bracket 23 is a member provided for unfolding and folding operations. As described above, the upper end of the inverting bracket 23 is connected to the lower end of the armrest support member 17, the lower end of the push rod 20, and the rear end of the seat support member 18 via the fourth pivot shaft 27. The lower end of the inverting bracket 23 is rotatably connected to the center of the rear leg 13, which extends in the vertical direction, via the fifth pivot shaft 28.

[0025] The lower end of the armrest support member 17 is switchable between a locked position and an unlocked position relative to the inverting bracket 23. The position in which the armrest support member 17 is locked to the rear legs 13 corresponds to the traveling state shown in FIGS. 1 and 2(A), where the lower end of the armrest support member 17 abuts against the upper part of the rear legs 13. The position in which the armrest support member 17 is unlocked from the rear legs 13 corresponds to the folded state shown in FIG. 2(B), where the lower end of the armrest support member 17 abuts against the lower part of the rear legs 13. Specifically, the lower end of the armrest support member 17 is provided with a locking portion (not shown) that can be locked to the inverting bracket 23, and unlocking the locking portion releases the lock between the armrest support member 17 and the inverting bracket 23. This configuration makes it possible to fold the foldable stroller 1. Note that the upper end of the inverting bracket 23 may also be provided with a locking portion that can be locked to the rear legs 13.

[0026] (About folding and unfolding operations) The folding and unfolding operations of the foldable stroller 1 will be described with reference to FIGS.

[0027] As described above, the upper ends of the front legs 11, the upper ends of the rear legs 13, and the front end of the armrest 15 are connected via the "first pivot shaft 24." The rear end of the armrest 15 and the upper end of the armrest support member 17 are connected via the "second pivot shaft 25." The center of the front legs 11 and the front end of the seat support member 18 are connected via the "third pivot shaft 26." The rear end of the seat support member 18, the lower end of the armrest support member 17, the lower end of the push rod 20, and the upper end of the reversing bracket 23 are connected via the "fourth pivot shaft 27." The lower end of the reversing bracket 23 and the center of the rear legs 13 are connected via the "fifth pivot shaft 28." In this way, the body frame 10 is rotatably connected at five pivot shafts. Furthermore, the lower end of the armrest support member 17 (the upper end of the reversing bracket 23) is switchable between a position locked to the rear legs 13 and a position unlocked.

[0028] The folding operation from the unfolded state shown in Fig. 2(A) to the folded state shown in Fig. 2(B) follows the progression shown in Figs. 3(A) to 3(D). First, the operating part 20c (Fig. 1) provided on the push rod 20 is operated to unlock the armrest support member 17 and the reversing bracket 23. With the operating part 20c still in the operated state, the push rod 20 is pushed downward. This causes the reversing bracket 23 to be reversed up and down, and the lower end of the armrest support member 17, which was abutting against the upper part of the rear leg 13, comes abutting against the lower part of the rear leg 13. In this state, the lower end of the armrest support member 17 and the lower end of the reversing bracket 23 are locked together.

[0029] The unfolding operation from the folded state shown in Fig. 2(B) to the unfolded state shown in Fig. 2(A) is as shown in Figs. 3(A) to (D) viewed from the opposite side. First, the operating part 20c (Fig. 1) provided on the push bar 20 is operated to pull the push bar 20 upward. This causes the reversing bracket 23 to be reversed up and down, and the lower end of the armrest support member 17, which had been abutting against the lower part of the rear leg 13, comes abutting against the upper part of the rear leg 13. In this state, the lower end of the armrest support member 17 and the upper end of the reversing bracket 23 are locked together. In this way, the body frame 10 changes shape from the unfolded state shown in Fig. 2(A) to the folded state shown in Fig. 2(B), or vice versa.

[0030] The folding and unfolding operations of the foldable stroller 1 require a certain amount of force to be applied, such as by pushing the push bar 20 downward or pulling it upward, so improved operability is desired. The foldable stroller 1 of this embodiment is provided with a torsion spring 40 that assists the folding and unfolding operations in order to improve the operability of the folding and unfolding operations.

[0031] (Regarding the first embodiment) The torsion spring 40 of this embodiment is preferably attached to the first to fifth rotating shafts 24 to 28 described above. The following describes the configuration for attaching the torsion springs 40 to 40B to the first, third, and fifth rotating shafts 24, 26, and 28. The torsion springs 40 to 40B of this embodiment are members that bias in a direction that increases the bending angle between the first member and the second member. In this embodiment, the first member and the second member are, for example, the body frame 10. The bending angle is the angle at which the first member and the second member intersect at the rotating shaft, and may also be an angle passing through the central axes of the first member and the second member.

[0032] First, we will explain part A shown in Figure 1. The first member in part A is rear leg 13, and the second member is inversion bracket 23. Inversion bracket 23 is connected to rear leg 13 via fifth pivot shaft 28, and the bending angle relative to rear leg 13 changes with the folding and unfolding operations. Increasing the bending angle means performing an unfolding operation from the folded state to the unfolded state, and decreasing the bending angle means performing a folding operation from the unfolded state to the folded state.

[0033] 4 is an enlarged view of portion A in FIG. 1, where (A) is a perspective view, (B) is a view showing the unfolded state, and (C) is a view showing the folded state. The torsion spring 40 includes a spirally wound coil portion 41, one end portion 42 continuing from the coil portion 41 and projecting in one direction, and the other end portion 43 continuing from the coil portion 41 and projecting in the other direction. The torsion spring 40 is a spring that operates by rotational motion, and stores energy in the coil portion 41 when the position of the one end portion 42 or the other end portion 43 changes. As shown in FIG. 4(A), the tip portion 45 of the other end portion 43 is bent outward in an L-shape. The one end portion 42 is not bent in an L-shape but extends linearly.

[0034] As shown in Figure 4(A), when the torsion spring 40 is provided between the rear leg 13 and the reversing bracket 23, the coil portion 41 is mounted inside the lower end of the reversing bracket 23 and attached to the fifth rotating shaft 28. One end 42 is attached to a groove 23a formed in the reversing bracket 23. The other end 43 is attached to the rear leg 13. Specifically, a through-hole 13a is provided in the rear leg 13 below the fifth rotating shaft 28, and a tip portion 45 of the other end 43 is inserted into the through-hole 13a.

[0035] Next, the unfolding and folding operations will be described. In the unfolded state shown in Fig. 4(B), the reversing bracket 23 faces upward so as to follow the top of the rear legs 13. When the stroller is shifted to the folded state shown in Fig. 4(C), the reversing bracket 23 is reversed and faces downward so as to follow the bottom of the rear legs 13. When the foldable stroller 1 is shifted to the folded state in this way, one end 42 and the other end 43 of the torsion spring 40 approach each other, and rotational energy is stored in the coil portion 41.

[0036] 4(B) from the folded state shown in Fig. 4(C), the stored energy is released, acting in a direction that moves one end 42 and the other end 43 apart, causing the reversing bracket 23 to revert forcefully and move along the top of the rear leg 13. In this way, because the torsion spring 40 is biased in a direction that increases the bending angle between the rear leg 13 and the reversing bracket 23, the transition from the folded state to the unfolded state is assisted, and the unfolding operation can be performed without requiring a strong force.

[0037] Furthermore, because it is only necessary to add the torsion spring 40 to the configuration of a typical stroller, the number of parts can be reduced compared to conventional assist structures, the increase in the overall weight of the folding stroller can be suppressed, and costs can also be reduced. Also, because the torsion spring 40 can be arranged inside the body frame 10, there is a degree of freedom in the design of the frame.

[0038] In conventional folding strollers, when unfolding, it was necessary to apply force to pull the push bar 20 upward from the fully folded state shown in FIG. 3(D) to the unfolded state shown in FIG. 3(A). In contrast, in this embodiment, once the stroller is lifted to the state shown in FIG. 3(B), i.e., the position where the reversing bracket 23 and the push bar 20 are aligned in a straight line (the traction point of the torsion spring 40), the weight of the body frame 10 automatically brings the stroller to the unfolded state shown in FIG. 3(A). This allows the stroller to be unfolded with a certain amount of movement, making it easy to operate. Furthermore, even if the operating part 20c is operated by mistake during folding, the stroller will not be folded unless the push bar 20 is operated beyond the traction point, preventing erroneous operation.

[0039] Next, part B shown in Fig. 1 will be described with reference to Fig. 5. Fig. 5 is an enlarged view of part B of Fig. 1, with (A) being a perspective view, (B) being a side view showing the unfolded state, and (C) being a side view showing the folded state. Fig. 5 discloses a configuration in which a torsion spring 40A is attached to a third pivot shaft 26 that rotatably supports the seat support member 18 and the front legs 11. The torsion spring 40A has substantially the same shape as the torsion spring 40 described above, but differs in that not only the other end 43A but also the one end 42A has a tip 45A that is bent outward in an L-shape. These tip ends 44A, 45A are bent in opposite directions.

[0040] 5, when a torsion spring 40A is provided between the seat support member 18 and the front leg 11, the coil portion 41A is attached to the third pivot shaft 26. In this case, the seat support member 18 is the first member, and the front leg 11 is the second member. The front leg 11 is connected to the seat support member 18 via the third pivot shaft 26, and the bending angle relative to the front leg 11 changes as the chair unfolds from the folded state to the unfolded state.

[0041] One end 42A of the torsion spring 40A is attached to the seat support member 18. Specifically, a tip 44A of the one end 42A is hooked onto and abuts against a side wall of the seat support member 18. The other end 43A is attached to the front leg 11. Specifically, a through-hole 11a is provided in the front leg 11 below the third rotating shaft 26, and a tip 45A of the other end 43A is inserted into the through-hole 11a.

[0042] In this configuration, the torsion spring 40A also assists the displacement from the folded state to the unfolded state, so that the unfolding operation can be performed without requiring a strong force.

[0043] Finally, part C shown in Fig. 1 will be described with reference to Fig. 6. Fig. 6 is an enlarged view of part C in Fig. 1, with (A) showing the unfolded state and (B) showing the folded state. Fig. 6 discloses a configuration in which a torsion spring 40B is attached to a first pivot shaft 24 that rotatably supports the front legs 11 and the rear legs 13. Torsion spring 40B has substantially the same shape as torsion spring 40A described above, but differs in that both tip portion 44B of one end 42B and tip portion 45B of the other end 43B are bent outward in the same L-shape.

[0044] 6, when torsion spring 40B is provided between front leg 11 and rear leg 13, coil portion 41B is attached to first pivot shaft 24. In this case, rear leg 13 is the first member, and front leg 11 is the second member. Front leg 11 is connected to rear leg 13 via first pivot shaft 24, and the bending angle relative to rear leg 13 changes with the unfolding operation from the folded state to the unfolded state.

[0045] One end 42B of torsion spring 40B is attached to rear leg 13. Specifically, a tip 44B of one end 42B is hooked onto and abuts against a side wall of rear leg 13 below first rotating shaft 24. The other end 43B is attached to front leg 11. Specifically, a tip 45B of the other end 43B is hooked onto and abuts against a side wall of front leg 11 below first rotating shaft 24.

[0046] In this configuration, the torsion spring 40B assists the displacement from the folded state to the unfolded state, so that the unfolding operation can be performed without requiring a strong force.

[0047] The torsion spring is preferably attached to the pivot that rotates during the folding operation, and in addition to the example described above, it may be provided on a pivot such as the second and fourth pivots 25 and 27. Torsion springs may be provided in multiple locations on a single folding stroller, or in one location. The torsion spring 40 is preferably provided in a location that is directly connected to or close to the push bar 20 that is operated during the folding and unfolding operations, specifically the second, fourth, and fifth pivots 25, 27, and 28. This allows force to be transmitted directly to the push bar 20, thereby efficiently assisting the unfolding or folding operation.

[0048] (Regarding the second embodiment) The configuration of a foldable stroller 1C according to embodiment 2 will be described with reference to Figures 7 to 9. The difference between embodiment 1 and this embodiment is that an additional member 50C is provided at part D shown in Figure 7.

[0049] Referring to Figure 7, an additional member 50C is provided on the rear leg 13 at a position below the connection point with the inverting bracket 23. The additional member 50C is a member that moves downward while coming into contact with the body frame 10 that constitutes the foldable stroller 1C as it is folded. In this embodiment, the first member is the rear leg 13, and the second member is the additional member 50C. In this embodiment 2, the first member is the body frame 10, but the second member is the additional member 50C that is provided separately from the body frame 10.

[0050] As particularly shown in FIG. 8 , the rear end of the seat support member 18 and the lower end of the armrest support member 17 (which is not visible as it overlaps the upper part of the armrest 15 and the front leg 11) are connected via a connecting portion 17a. The connecting portion 17a may be any member that extends in the width direction and has thickness, and may be a separate member from the seat support member 18 and the armrest support member 17, or may be a part of the seat support member 18 or the armrest support member 17. Even if the connecting portion 17a is a separate member from the seat support member 18 and the armrest support member 17, it still constitutes a part of the body frame 10. The additional member 50C abuts against this connecting portion 17a. The connecting portion 17a is a point that is linearly connected to or close to the push rod 20 that is operated for folding and unfolding operations.

[0051] The additional member 50C is rotatably connected to the rear leg 13 via a sixth pivot shaft 29C. As shown in FIG. 9(A), the additional member 50C has a generally elongated rectangular shape and includes a main body 51C, one end 52C having a recess 53C, and the other end 54C through which the pivot shaft 29C passes. As shown in FIG. 9(B), the recess 53C of the one end 52C abuts the connecting portion 17a described above. When a torsion spring 40C is provided between the rear leg 13 and the additional member 50C, the coil portion 41C is attached to the sixth pivot shaft 29C. The one end 42C is attached to a groove 55C formed in the additional member 50C. The other end 43C is attached to the rear leg 13. Specifically, a through-hole 13a is provided in the rear leg 13 below the sixth pivot shaft 29C, and a tip portion 45C of the other end 43C is inserted into the through-hole 13a.

[0052] Next, the unfolding and folding operations will be described. In the unfolded state shown in Fig. 9(A), the additional member 50C is approximately perpendicular to the rear legs 13. When the additional member 50C is shifted to the folded state shown in Fig. 9(B), the recessed portion 53C of the additional member 50C is pushed downward by the connecting portion 17a, and is aligned with the rear legs 13 as shown in Fig. 9(C). When the foldable stroller 1 is shifted to the folded state in this way, one end 42C and the other end 43C of the torsion spring 40C approach each other, and rotational energy is stored in the coil portion 41C.

[0053] 9(A) from the folded state shown in Fig. 9(C), the stored energy is released, acting in a direction that moves one end 42C and the other end 43C apart, urging additional member 50C upward with force, and connecting portion 17a moves upward. In this way, because torsion spring 40C is urged in a direction that increases the bending angle between additional member 50C and rear leg 13, the transition from the folded state to the unfolded state is assisted, and the unfolding operation can be performed without requiring a strong force.

[0054] As in the second embodiment, the second member does not have to be part of the body frame 10, but may be a separate member attached to the body frame 10. Also in the second embodiment, a torsion spring 40 is provided at a location that is linearly connected to or close to the push bar 20 that is operated during the folding operation, specifically, at the sixth pivot shaft 29C of the rear leg 13.

[0055] In the first and second embodiments, the torsion springs 40 and 40C are provided to bias the first and second members in a direction that increases the bending angle between the first and second members. However, this is not limited to this. The torsion springs 40 and 40C may be components that bias the first and second members in a direction that decreases the bending angle between the first and second members. This makes it possible to easily perform the folding operation of folding the device from the unfolded state to the folded state.

[0056] In addition, in the second embodiment, the additional member 50C is provided on the rear leg 13, but the attachment location is not limited as long as the member abuts against the body frame 10 and moves downward as the folding operation proceeds.

[0057] Furthermore, although the configurations of the torsion springs 40 to 40C have been described in the above-mentioned first and second embodiments, the torsion springs may have shapes that are generally commercially available at the time of filing. Furthermore, the fixing points of the torsion springs 40 to 40C are not limited to those in the above-mentioned embodiments.

[0058] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0059] 1,1C Folding stroller, 10 Body frame, 11 Front legs, 13 Rear legs, 15 Armrest, 17 Armrest support member, 18 Seat support member, 23 Inversion bracket, 24 First pivot shaft, 25 Second pivot shaft, 26 Third pivot shaft, 27 Fourth pivot shaft, 28 Fifth pivot shaft, 29C Sixth pivot shaft, 40,40C Torsion spring, 50C Additional member.

Claims

1. In a folding stroller that has different shapes when unfolded and folded, A first member; a second member connected to the first member via a first rotation shaft, the second member having a bending angle relative to the first member that changes with a folding operation from the unfolded state to the folded state or an unfolding operation from the folded state to the unfolded state; a torsion spring attached to the first rotation shaft and biasing the first member and the second member in a direction to increase or decrease the bending angle between the first member and the second member; a seat support member for supporting the seat, the first member is a rear leg having a wheel at its lower end and extending in the vertical direction, the second member is an inverted bracket whose one end is rotatably connected to the rear leg and whose other end is rotatably connected to a lower end of the armrest support member, and which rotates in response to changes in configuration; The other end of the inversion bracket, the rear end of the seat support member, and the lower end of the armrest support member are rotatably connected via a second rotation shaft.

2. In a folding stroller that has different shapes when unfolded and folded, an armrest extending in the front-rear direction of the foldable stroller and having a rotation shaft at its front end; a rear leg having a wheel at its lower end, extending in the vertical direction, and rotatably connected at its upper end to the front end of the armrest via the pivot shaft; a front leg having a wheel at its lower end and extending in a vertical direction, the front leg being connected to a front end of the armrest and an upper end of the rear leg via the pivot shaft, the front leg having a bending angle relative to the rear leg and the armrest changing with a folding operation from the unfolded state to the folded state or an unfolding operation from the folded state to the unfolded state; a torsion spring attached to the pivot shaft for biasing the rear legs and the front legs in a direction to increase or decrease the bending angle between the rear legs and the front legs; A foldable stroller, wherein the coil portion of the torsion spring is attached to the pivot shaft, one end of the torsion spring is attached to the rear leg, and the other end of the torsion spring is attached to the front leg.

3. A folding stroller that has different shapes when unfolded and when folded, A first member; a second member connected to the first member via a pivot shaft, the second member having a bending angle relative to the first member that changes with a folding operation from the unfolded state to the folded state or an unfolding operation from the folded state to the unfolded state; a torsion spring attached to the rotary shaft and biasing the first member and the second member in a direction that increases the bending angle between the first member and the second member; the first member is a rear leg having a wheel at its lower end and extending in the vertical direction, the second member is an additional member that abuts against a body frame that constitutes the foldable stroller and rotates downward when the stroller is in the folded state, The torsion spring biases the second member upward when the stroller is in the folded state.

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