CN107097833B

CN107097833B - Folding baby carriage

Info

Publication number: CN107097833B
Application number: CN201610874470.XA
Authority: CN
Inventors: 薮内仁志
Original assignee: Japanese Joint Stock Co
Current assignee: Japanese Joint Stock Co
Priority date: 2015-11-06
Filing date: 2016-09-30
Publication date: 2021-05-07
Anticipated expiration: 2036-09-30
Also published as: JP6624893B2; JP2017087893A; CN107097833A

Abstract

The present invention relates to a collapsible stroller capable of relaxing vibration transmitted to a seat. A foldable stroller includes: a vehicle body frame including front and rear legs (15) having different configurations in an expanded state and a folded state; a seat (18) having a front end connected to the front leg; displacement members (22, 28) rotatably connected to the rear end of the seat and displaced in accordance with a change in the form of the vehicle body frame; and an elastic mechanism (40) which is provided on the displacement member and elastically supports the rear end of the seat from below.

Description

Folding baby carriage

Technical Field

The present invention relates to a foldable stroller which can be changed into an unfolded state and a folded state.

Background

Conventionally, there is known a structure in which a cushion material is provided between a stroller body and a seat so that an infant seated on the seat does not feel uncomfortable by receiving vibration from a road surface.

Japanese patent laying-open No. 11-89664 (patent document 1) discloses a seat vibration absorbing structure in which a stay connecting left and right leg portions is inserted through a longitudinal hole formed in a support portion of a seat, an elastic member elastically supporting the seat from below is attached to a holder, and the stay is inserted through a through hole formed in a lower portion of the holder, whereby vibration transmitted to the seat via the leg portions is absorbed by the elastic member.

In recent years, foldable strollers that can be unfolded to an unfolded state when in use and folded to be compact when not in use have become widespread.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 11-89664

Disclosure of Invention

(problems to be solved by the invention)

The stroller disclosed in patent document 1 is provided with a vibration absorbing structure for reducing vibration transmitted to the seat. However, the seat of patent document 1 does not correspond to a foldable stroller.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a foldable stroller capable of mitigating vibration transmitted to a seat.

(means for solving the problems)

To achieve the above object, a collapsible stroller according to an embodiment of the present invention includes: a vehicle body frame including front and rear legs, the vehicle body frame being different in configuration between an expanded state and a folded state; a seat, the front end of which is rotatably connected with the front foot; a displacement member connected to a rear end of the seat and displaced in accordance with a change in a form of the vehicle body frame; and an elastic mechanism which is provided to the displacement member and elastically supports the rear end of the seat from below.

Preferably, the elastic mechanism includes a seat frame receiving member that is connected to the displacement member and holds the seat frame constituting the seat so as to be movable up and down, and an elastic member that elastically supports the seat frame held by the seat frame receiving member from below.

Preferably, the seat frame receiving member has a connecting shaft connected to the displacement member and an opening extending downward from the connecting shaft and opening in the front-rear direction, and the elastic member is disposed in the opening.

Preferably, the seat frame has a fixing portion fixed to the seat frame and a cylindrical body provided substantially orthogonally to the fixing portion and surrounding the seat frame receiving member.

Preferably, the seat frame constituting the seat includes a rear end bracket extending in the vertical direction, the rear end bracket has an opening extending in the vertical direction, and the elastic mechanism has a connecting shaft disposed in the opening and connected to the displacement member, and an elastic member elastically supporting the seat frame.

Preferably, the elastic member is a coil spring biasing the seat upward.

Preferably, the displacement member is a reverse bracket, one end of which is rotatably connected to the rear leg, and the other end of which is rotatably connected to the rear end of the seat.

Preferably, the vehicle body frame includes an armrest rotatably attached to the front and rear legs, and the displacement member is an armrest support frame having one end rotatably connected to a rear end of the armrest and the other end rotatably connected to a rear end of the seat.

(effect of the invention)

According to the present invention, it is possible to provide a foldable stroller capable of mitigating vibration transmitted to a seat.

Drawings

Fig. 1 is a perspective view showing a collapsible stroller according to embodiment 1 of the present invention;

fig. 2 shows a unfolded state of the pushchair, viewed in cross section along the line II-II in fig. 1;

FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing the pushchair in a collapsed condition;

fig. 4 is a sectional view corresponding to fig. 2 showing an unfolded state of the pushchair;

fig. 5 is a sectional view corresponding to fig. 2 showing a compressed state of the resilient mechanism of the pushchair;

fig. 6 is an enlarged perspective view showing a part of fig. 1;

FIG. 7 is a perspective view showing a seat frame receiving member of the elastic mechanism;

fig. 8 (a) is a perspective view showing the vertical movement member of the elastic mechanism, and fig. 8 (B) is a perspective view showing the vertical movement member of the elastic mechanism as viewed from the back side;

fig. 9 is a sectional view showing a collapsible stroller according to embodiment 2 of the present invention;

fig. 10 is a sectional view showing a part of fig. 9 enlarged;

fig. 11 is a sectional view showing a compressed state of the elastic mechanism of the foldable stroller according to embodiment 2 of the present invention.

Fig. 12 is a schematic diagram showing another configuration example of the foldable stroller.

Description of reference numerals:

1. folding baby carriage

12. Front wheel

13. Rear wheel

14. Front foot

15. Rear foot

18. 18A, seat frame

20. Armrest

22. Armrest supporting frame (position-changing component)

23. 25, connecting shaft

26. Rotary bracket

27. Connecting shaft

28. 28A, reverse bracket (position changing component)

29. 29A, a connecting shaft,

30. 30A, connecting shaft

34. Push rod

35. A rotating shaft,

36. Handle part

37. 37A, connecting shaft

38B, connecting part

39B, slide member (displacement member)

40. 40A, 40B, elastic mechanism

41. Seat frame receiving member

43. Storage part

44. 44A, opening part

45. Receiving part

46. Cylindrical part

47. 47A, elastic Member

50. Up-down moving member

51. Fixing part

52. Barrel body

53. Hole(s)

54. Rivet

60A, rear end bracket

61A, seat receiving part

62A, projection

63A, hole

431. Lower end

432. Upper square end

441A, upper end

510. Upper transverse plate

511. Lower cross plate

512. Vertical plate

520. A recess.

Detailed Description

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.

Brief description of the foldable stroller

First, the overall structure of the pushchair 1 will be described.

Fig. 1 is a perspective view showing a foldable stroller according to embodiment 1 of the present invention. Fig. 2 shows the unfolded state of the pushchair 1, and is a sectional view taken along line II-II in fig. 1. Fig. 1 and 2 are both unfolded states in use. On the other hand, fig. 3 is a sectional view corresponding to fig. 2, and shows a state in which the foldable stroller 1 is completely folded (hereinafter, referred to as "folded state"). Therefore, the foldable stroller 1 according to the present embodiment is set to any one of the unfolded state shown in fig. 1 and 2 and the folded state shown in fig. 3. In the case of the still standing of the foldable stroller 1, the front-back direction corresponds to the front-back direction of the foldable stroller 1, and the left-right direction corresponds to the left-right direction when viewed from the front of the foldable stroller 1. The width direction also corresponds to the left-right direction when viewed from the front of the foldable stroller 1. In fig. 2 and 3, members other than the inversion bracket 28 are shown by broken lines for easy understanding.

The collapsible stroller 1 includes: a vehicle body frame, a seat frame 18, a pair of right and left armrest support frames 22, and a plurality of

brackets

26, 28; a pair of left and right front legs 14 having front wheels 12 at lower ends thereof and extending in the vertical direction, a pair of left and right rear legs 15 having rear wheels 13 at lower ends thereof and extending in the vertical direction, and a pair of left and right armrests 20 extending in the front-rear direction; the seat frame 18 is disposed between the forefoot 14 and the rearfoot 15; the pair of right and left armrest support frames 22 support the rear ends of the armrests 20 and extend in the vertical direction; the plurality of

brackets

26, 28 are relatively movably connected to the frame.

The upper ends of the front legs 14 and the rear legs 15 and the front end of the armrest 20 are rotatably connected to each other by a common connecting shaft 25. The rear end of the armrest 20 is rotatably connected to the upper end of the armrest support frame 22 by a connecting shaft 23. The armrest support frame 22 is a member that rotates in accordance with a change in the form of the vehicle body frame, and is, for example, a linearly extending pipe.

The reversing bracket 28 is a displacement member that is displaced in accordance with a change in the form of the vehicle body frame, and has, for example, a substantially boomerang front view. The upper end of the inversion bracket 28 is rotatably connected to the lower end of the armrest support frame 22 by a connecting shaft 29. The lower end of the inversion bracket 28 is connected to the center of the rear leg 15 via a connecting shaft 30. Thus, the lower half of the inversion bracket 28 is provided along the rear leg 15, and the upper half thereof is erected in the vertical direction from the rear leg 15.

Further, the upper end of the inversion bracket 28 is rotatably connected to the rear end of the seat frame 18 via a connecting shaft 29. In this case, an elastic mechanism 40 is provided between the seat frame 18 and the connecting shaft 29. Therefore, the link shaft 29 rotatably connects the inversion bracket 28 and the armrest support frame 22, and the elastic mechanism 40. The elastic mechanism 40 elastically supports the rear end of the seat frame 18 from below, and absorbs the shock transmitted to the seat.

A seat frame 18 having a horizontal U-shape in plan view is provided between the front leg 14 and the rear leg 15 of the foldable stroller 1, and the seat frame 18 extends in the front-rear direction and has rear ends connected in the left-right direction. The seat frame 18 is a frame for supporting a not-shown infant seat. A removable balustrade, not shown, may be provided at the front end of the handrail 20.

As described above, the rear end of the seat frame 18 is rotatably connected to the connecting shaft 29 of the inversion bracket 28 by the elastic mechanism 40. The front end of the seat frame 18 is rotatably connected to a connecting shaft 27 via a rotating bracket 26. Thus, the swivel bracket 26 is rotatably coupled to the center portion of the front leg 14.

By the front legs 14, the rear legs 15, the seat frame 18, the arm rests 20, the arm rest support frame 22, and the

brackets

26, 28 being rotated about the connecting

shafts

23, 25, 27, 29, 30, the vehicle body frame is deformed into an expanded state (fig. 2) expanded for use and a collapsed state (fig. 3) contracted for non-use. In the expanded state, as shown in fig. 2, the inversion bracket 28 assumes a posture in which the connection shaft 29 is positioned on the upper side and the connection shaft 30 is positioned on the lower side. In contrast, in the folded state, as shown in fig. 3, the inversion bracket 28 is inverted to a posture that is upside down by the connecting shaft 29 and upside by the connecting shaft 30. Thereby, the vehicle body frame is greatly reduced in the front-rear direction and the up-down direction.

The lower end of the handrail support frame 22 is connected to the lower end of a push rod 34 by a connecting shaft 29. Therefore, the connecting shaft 29 rotatably connects the push rod 34, the inversion bracket 28, the armrest support frame 22, and the elastic mechanism 40. The push rod 34 is a linearly extending tube and is rotatable in the front-rear direction about the connecting shaft 29. The push rod 34 can selectively switch between a rear-side push position and a front-side opposite position, not shown, in the deployed state. The upper end of the push rod 34 is connected to a handle 36 through a rotary shaft 35. The handle portion 36 can be angled back by the rotation shaft 35. The handle portion 36 extends in the left-right direction and is mounted on a pair of left and right push rods 34.

< embodiment 1 >

The structure of the elastic mechanism 40 according to embodiment 1 will be described with reference to fig. 4 to 7. Fig. 4 is a sectional view showing an unfolded state of the foldable stroller 1 according to embodiment 1 of the present invention. Fig. 5 is a sectional view showing a compressed state of the elastic mechanism 40 of the foldable stroller 1 according to embodiment 1 of the present invention. The elastic mechanism 40 shown in fig. 4 is in a state of not being subjected to vibration. The elastic mechanism 40 shown in fig. 5 is in a state of absorbing vibration. Fig. 6 is an enlarged perspective view showing a part of fig. 1, particularly an enlarged elastic mechanism 40. Fig. 7 is a perspective view showing the seat frame receiving member 41 of the elastic mechanism 40. Fig. 8 (a) is a perspective view showing the vertical movement member 50 of the elastic mechanism 40, and fig. 8 (B) is a perspective view of the vertical movement member 50 of the elastic mechanism 40 as viewed from the back side.

Referring to fig. 6, the elastic mechanism 40 is provided in a displacement member that is displaced in accordance with a change in the form of the vehicle body frame. That is, the elastic mechanism 40 rotatably connects the inversion bracket 28 and the armrest support frame 22 through the connection shaft 29. Specifically, the elastic mechanism 40 is rotatably provided at an upper end portion of the inversion bracket 28 via the connecting shaft 29, and is rotatably connected to a lower end of the armrest support frame 22. The elastic mechanism 40 elastically supports the rear end of the seat frame 18 from below. As described above, in order to prevent the vibration transmitted from the road surface from being transmitted to the seat, the elastic mechanism 40 absorbs the vibration. Further, the elastic mechanism 40 absorbs the vibration of the seat so as not to transmit the vibration to the vehicle body frame and hinder the traveling.

The elastic mechanism 40 includes a seat frame receiving member 41 that connects the reversing bracket 28 and the armrest support frame 22 and holds the seat frame 18 so as to be movable up and down, and an elastic member 47 that elastically supports the seat frame 18 held by the seat frame receiving member 41 from below. Further, the seat frame 18 may include an up-down moving member 50 that supports the up-down movement of the seat frame 18.

First, the seat frame receiving member 41 will be explained. Referring to fig. 6 and 7 in particular, the seat frame receiving member 41 includes a connecting shaft 42, a housing portion 43, an opening portion 44, a receiving portion 45, and a cylindrical portion 46. The connection shaft 42 penetrates the cylindrical portion 46 and connects the seat frame receiving member 41 and the inversion bracket 28. That is, the connecting shaft 42 is the connecting shaft 29 connecting the inversion bracket 28 and the armrest support frame 22. Therefore, the inversion bracket 28, the armrest support frame 22, and the elastic mechanism 40 are rotatably connected by the connecting shaft 42.

The housing portion 43 is provided below the connecting shaft 42, and has an opening portion 44 that opens in the front-rear direction and has a rectangular front view. The elastic member 47 is disposed in the opening 44. Further, the receiving portion 45 is disposed in the opening portion 44 and above the elastic member 47. The receiving portion 45 has a U-shape and supports the seat frame 18 from below. Therefore, the receiving portion 45 can vertically move and support the seat frame 18 by the elasticity of the elastic member 47.

The elastic member 47 is, for example, a coil spring, and is biased upward. The lower end of the elastic member 47 is disposed so as to abut against the lower end 431 of the housing 43. The upper end of the elastic member 47 abuts on the lower side of the receiving portion 45. The receiving portion 45 receives the seat frame 18 in the front-rear direction, and the seat frame 18 is disposed between the receiving portion 45 and the upper end 432 of the opening portion 44. That is, with such a configuration, the seat frame 18 can be elastically held by the elastic member 47, and the impact transmitted to the seat frame 18 can be absorbed by the elastic member 47.

Next, the up-down moving member 50 is specified. Referring to fig. 6 and 8 in particular, the vertical movement member 50 is provided so as to be movable vertically relative to the seat frame receiving member 41. The vertical movement member 50 includes: a fixed portion 51 fixed to the seat frame 18, and a cylindrical body 52 provided substantially perpendicularly to the fixed portion 51 and surrounding the seat frame receiving member 41. The fixing portion 51 is provided in a horizontal U-shape in cross section and is formed by an upper horizontal plate 510, a lower horizontal plate 511, and a vertical plate 512 connecting the

horizontal plates

510, 511. The fixing portion 51 holds the rear end portion of the seat frame 18, and surrounds three sides of the seat frame 18. A pair of holes 53 are provided in the riser 512. Rivets 54 are inserted through the pair of holes 53, and the vertical movement member 50 and the seat frame 18 are fixed integrally. Thus, the vertical movement member 50 regulates movement (movement in the left-right direction or the front-rear direction) other than the vertical movement of the seat frame 18, and moves the seat frame 18 only in the vertical direction along the outer periphery of the seat frame receiving member 41.

The tubular body 52 of the vertical movement member 50 has a hollow shape and surrounds the housing portion 43 of the seat frame receiving member 41. The cylindrical body 52 is provided substantially perpendicularly to the fixing portion 51 and has a shape along the outer periphery of the seat frame receiving member 41. The connecting shaft 29 is disposed in a recess 520 provided above the cylindrical body 52.

The operation of the elastic mechanism 40 when the stroller 1 receives an impact will be described. The impact refers to all impacts received by the seat, including not only the impact transmitted from the road surface to the

feet

14, 15, but also the impact of the seat when the infant moves on the seat.

As shown in fig. 4, in a state where the elastic mechanism 40 is not subjected to an impact, the elastic member 47 is biased upward. When the elastic mechanism 40 of the foldable stroller 1 receives an impact, the elastic member 47 is compressed by the pressure from above the seat frame 18 as shown in fig. 5, and absorbs the impact. This allows the elastic mechanism 40 to effectively absorb the vibration generated in the seat. In addition, the rear of the seat supports the buttocks of the infant. Therefore, by providing the elastic mechanism 40 at the rear end of the seat frame 18, the impact on the seat frame 18 can be absorbed more effectively.

Since the elastic mechanism 40 connects the reversing bracket 28 and the armrest support frame 22, even when the stroller 1 is folded as shown in fig. 3, the elastic mechanism 40 can rotate together with the seat frame 18 to fold the stroller 1 small, and the reversing bracket 28 is a displacement member that displaces in response to a change in the configuration of the body frame.

Further, since the seat is formed not by the seat panel but by the seat frame 18, the weight of the entire stroller can be reduced. In this case, the entire foldable stroller 1 can be further reduced in weight by forming the body frame also from a hollow pipe.

In the following embodiments, a configuration example of the elastic mechanism 40 will be described. Only the differences from embodiment 1 will be described in detail below.

< embodiment 2 >

In embodiment 1, the elastic mechanism 40 is provided independently. In contrast, in the present embodiment, the elastic mechanism 40A is provided integrally with the seat frame 18A.

Fig. 9 is a cross-sectional view of the foldable stroller 1A according to embodiment 2 of the present invention, as viewed from the left side with a portion corresponding to fig. 2 cut. Fig. 10 is a sectional view showing a part of fig. 9 enlarged. Fig. 11 is a view corresponding to fig. 10, and is a sectional view showing a compressed state of the elastic mechanism 40A of the foldable stroller 1A. The direction of the arrow shown in fig. 9 is forward, and the opposite direction of the arrow is rearward.

Referring to fig. 9 to 11, the lower end of the armrest support frame 22 is connected to the lower end of the push rod 34 via a connecting shaft 37A. The push rod 34 is a linearly extending tube, is rotatable in the front-rear direction about a connecting shaft 37A, and is capable of selectively switching between a rear face push position and a front face push position, not shown, in the deployed state.

The inversion bracket 28A is a member that rotates in accordance with a change in the form of the vehicle body frame, and has, for example, a slightly deformed boomerang shape in front view. The upper side of the inversion bracket 28A is rotatably connected to the lower side of the armrest support frame 22 via a connecting shaft 29A. The lower end of the inversion bracket 28A is connected to the center of the rear leg 15 via a connecting shaft 30A.

The seat frame 18A includes: and a rear end bracket 60A extending in the vertical direction near the rear leg 15. The rear end bracket 60A has a substantially triangular shape as viewed from the top, for example, and includes a seat receiving portion 61A and a protruding portion 62A provided above the seat receiving portion 61A. The seat receiving portion 61A is a hollow shape positioned at a bottom side portion of the substantially triangular shape in plan view, and receives the rear side of the seat frame 18A. Specifically, the seat receiving portion 61A receives the rear side of the seat frame 18A substantially horizontally. The seat receiving portion 61A is provided so as to surround the outer periphery of the seat frame 18A, and the hole 63A is provided at 2. The seat receiving portion 61A and the seat frame 18A are fixed by inserting screws into the holes 63A.

The protruding portion 62A is provided so as to protrude above the seat receiving portion 61A, and is provided with an opening portion 44A that opens in the left-right direction. The opening 44A is provided with an elastic mechanism 40A. That is, since the elastic mechanism 40A includes the connecting shaft 29A and the elastic member 47A, the elastic member 47A and the connecting shaft 29A are disposed in the opening 44A. An elastic member 47A is disposed between the upper end 441A of the opening 44A and the connecting shaft 29A. The rear end bracket 60A is biased upward by the elastic member 47A, and as a result, the seat frame 18A is also elastically held by the elastic member 47A.

When an impact is applied to the seat, as shown in fig. 11, the seat frame 18A moves downward, and the entire rear end bracket 60A moves downward. Thus, since the connecting shaft 29A does not move downward together with the inversion bracket 28A and the armrest support frame 22, the elastic member 47A abutting against the upper end 441A of the opening 44A is compressed. This allows the elastic member 47A to absorb the impact of the seat.

The elastic mechanism 40 of the present embodiment has a smaller number of components than the elastic mechanism 40 of embodiment 1, and therefore, the stroller can be further reduced in weight.

In the above embodiments, the reversing

brackets

28 and 28A and the armrest support frame 22 are described as the displacement members, and the reversing

brackets

28 and 28A, the armrest support frame 22, and the elastic mechanism 40 are rotatably connected by the connecting shaft 29. However, any one of the

inversion brackets

28, 28A and the armrest support frame 22 may be rotatably connected to the elastic mechanism 40 via the connecting shaft 29. The displacement member is not limited to the

inversion brackets

28, 28A and the armrest support frame 22, and may be any member that displaces in response to a change in the form of the vehicle body frame.

Fig. 12 is a schematic diagram showing another configuration example of the foldable stroller 1B, in which fig. 12 (a) is a schematic diagram showing an unfolded state and fig. 12 (B) is a schematic diagram showing a folded state. Referring to fig. 12 (a) and (B), the foldable stroller 1B includes a connecting portion 38B and a slide member 39B (displacement member). The connecting portion 38B connects the armrest 20 and the push rod 34. The slide member 39B is connected to the elastic mechanism 40B and slides in the vertical direction along the rear leg 15 in accordance with a change in the form of the vehicle body frame. Thus, when the foldable stroller 1B is folded, the slide member 39B slides downward along the rear leg 15, and when the foldable stroller 1B is unfolded, the slide member 39B slides upward along the rear leg 15.

In the above embodiments, the

elastic members

47 and 47A have been described as coil springs, but the present invention is not limited to this. The

elastic members

47 and 47A may be any members as long as they bias the seat frame 18 upward, and may be, for example, elastic rubber or other springs.

In addition, in embodiment 1, the elastic mechanism 40 is provided so that the seat frame 18 is fixed to the vertical movement member 50, but the seat frame 18 may not be fixed by the vertical movement member 50. That is, the seat frame 18 may be held by the seat frame receiving member 41 so as to be movable up and down.

In embodiment 1, the receiving portion 45 for receiving the seat frame 18 and the cylindrical portion 46 through which the connecting shaft 42 passes are provided in the seat frame receiving member 41, but the present invention is not limited to this. For example, the seat frame 18 may be directly disposed on the elastic member 47.

In embodiment 2, the rear end bracket 60A has been described as having the seat receiving portion 61A and the protruding portion 62A provided above the seat receiving portion 61A. However, the rear end bracket 60A may have an opening 44A, and the elastic mechanism 40A may be disposed in the opening 44A.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the embodiments shown in the drawings. Various modifications and variations can be added to the embodiments shown in the drawings within the same scope or equivalent scope of the present invention.

Claims

1. A pushchair, comprising:

a vehicle body frame including a front leg and a rear leg, wherein distances in a front-rear direction of end portions of the front leg and the rear leg are different between an expanded state and a folded state;

a seat, the front end of which is rotatably connected with the front foot;

a displacement member connected to a rear end of the seat and connected to the rear leg in a manner displaced in accordance with a change in form of the vehicle body frame;

and an elastic mechanism provided to the displacement member and elastically supporting a rear end of the seat from below.

2. The pushchair of claim 1,

the elastic mechanism includes a seat frame receiving member that is connected to the displacement member and holds a seat frame constituting the seat so as to be movable up and down, and an elastic member that elastically supports the seat frame held by the seat frame receiving member from below.

3. The pushchair of claim 2,

the seat frame receiving member has a connecting shaft connected to the displacement member and an opening portion extending downward from the connecting shaft and opening in the front-rear direction,

the elastic member is disposed in the opening.

4. A pushchair according to claim 2 or 3,

the seat frame has a fixing portion fixed to the seat frame and a cylinder provided substantially orthogonally to the fixing portion and surrounding the seat frame receiving member.

5. The pushchair of claim 1,

the seat frame constituting the seat includes a rear end bracket extending in an up-down direction,

the rear end bracket has an opening portion extending in the up-down direction,

the elastic mechanism includes a connecting shaft disposed in the opening and connected to the displacement member, and an elastic member elastically supporting the seat frame.

6. A pushchair according to any one of claims 2, 3 or 5, wherein,

the elastic member is a coil spring that biases the seat upward.

7. A pushchair according to any one of claims 1 to 3, 5,

the displacement member is a reverse bracket, one end of which is rotatably connected to the rear leg, and the other end of which is rotatably connected to the rear end of the seat.

8. A pushchair according to any one of claims 1 to 3, 5,

the body frame includes an armrest rotatably mounted with respect to the front and rear feet,

the displacement member is an armrest support frame, one end of the armrest support frame is rotatably connected to a rear end of the armrest, and the other end of the armrest support frame is rotatably connected to a rear end of the seat.