TWI654109B - Stroller and tubular member for stroller - Google Patents

Abstract

The present invention provides a baby carriage having a tubular member including carbon fibers and a resin.

Description

Stroller and tubular member for stroller Field of invention

The present invention relates to a stroller and a tubular member used in the stroller, and more particularly to a stroller and a tubular member which can improve both the weight reduction and the vibration absorbing function of the stroller.

Background of the invention

For example, as disclosed in JP 2014-73846 A, a baby carriage is generally used when an infant is taken out. The stroller that the infant is going to ride on will be affected by the road surface during walking. Therefore, in order to suppress the transmission of the impact to the infant, the stroller is provided with a mechanism for absorbing vibration. As the vibration absorbing mechanism, a suspension mechanism of the wheel holding unit, an installation of a vibration absorbing material for the seating area of the infant, and the like can be exemplified. However, the provision of such a vibration absorbing mechanism is a cause of the weight of the stroller.

Summary of invention

The present invention has been made in view of the above points, and aims to effectively improve the vibration absorbing function of the stroller while effectively suppressing the weight of the stroller.

The stroller of the present invention has a cylinder containing carbon fiber and resin Shaped member.

In the stroller of the present invention, the cylindrical member has a plurality of layers which are disposed at positions different in the thickness direction, and each layer includes carbon fibers, and the length direction of the carbon fibers between the plurality of layers may also be formed. To be different from each other.

In the stroller of the present invention, the tubular member has a first layer in which a longitudinal direction of the carbon fibers is along an axial direction of the tubular member, and a second layer in which a longitudinal direction of the carbon fibers is along the tubular shape a circumferential direction of the member; and a third layer, wherein a longitudinal direction of the carbon fiber is along an axial direction of the tubular member, and the second layer may be located in the first layer and the aforementioned layer in a thickness direction of the tubular member Between the third floor.

In the stroller of the present invention, the resin may be a thermosetting resin.

In the stroller of the present invention, the resin may be a thermoplastic resin, and the tubular member may be curved.

In the stroller of the present invention, the tubular member may be a member made of a carbon fiber reinforced plastic formed into a tubular shape by a pultrusion method.

The stroller of the present invention may further have an end member fixed to at least one of the open end portions of the tubular member, and the end member includes an inner support portion that is inserted into the cylindrical member. And having an inner facing surface opposite to a circumferential surface of the inner surface of the tubular member; and an outer support portion having an outer opposing surface having an external facing surface The outer surface of the cylindrical member is opposed to each other in a circumferential region.

In the stroller of the present invention, the end member may be connected to other components of the stroller.

In the stroller of the present invention, the tubular member is a portion in which the end member is provided, and other components of the stroller are connected.

In the stroller of the present invention, the end member may include: a first member having the inner support portion and a base portion integrally formed with the inner support portion; and the second member separately from the first member The outer flange portion and the flange portion are formed to extend from an end portion of the outer support portion and face the end surface of the tubular member.

In the stroller according to the present invention, the end member may include: a first member having the external support portion and a base portion integrally formed with the external support portion; and a second member and the first member Each of the inner support portions and the flange portion is formed to extend from an end portion of the inner support portion so as to face an end surface of the tubular member.

In the stroller of the present invention, the end member may have a base integrally formed with both the inner support portion and the outer support portion.

The stroller of the present invention has a front leg, a rear leg, and a handle, and the cylindrical member may form at least one of the front leg, the rear leg, and the handle.

The stroller of the present invention has: a front foot and a rear leg; an armrest that is rotatably coupled to the front foot and the rear leg; a first link that is rotatably coupled to the armrest; and a second link that is rotatable Ground connected to the aforementioned forefoot; And the third link is rotatably connected to the rear leg, and the first link is rotatably connected to at least one of the second link and the third link, and the second link At least one of the first link and the third link is rotatably connected, and the third link is rotatably connected to at least one of the first link and the second link The cylindrical member forms at least one of the front leg, the rear leg, the first link, the second link, and the third link.

The stroller of the present invention has a pair of forefoot and a pair of rear legs; a pair of armrests are rotatably coupled to the forefoot and the rear leg; and a pair of first links are rotatably coupled to the armrest; a second link that is rotatably coupled to the forefoot; a pair of third links that are rotatably coupled to the rear leg; a rear link that connects the pair of rear legs; and a link connecting member Connecting the pair of second links, wherein the first link is rotatably connected to at least one of the second link and the third link, and the second link is rotatably coupled to At least one of the first link and the third link is connected, and the third link is rotatably connected to at least one of the first link and the second link, and the cylindrical shape The member may be at least a part of one or more of the front leg, the rear leg, the first link, the second link, the third link, the rear connecting member, and the link connecting member.

In the stroller of the present invention, the first link may be a part of the handle.

The stroller of the present invention has: a front foot and a rear leg; an armrest is rotatably coupled to the front foot and the rear leg; the first link is rotatable The ground is connected to the armrest; the second link is rotatably coupled to the front leg; the third link is rotatably coupled to the rear leg; and the handle is rotatably coupled to the first link And connecting at least one of the second link and the third link, wherein the first link is rotatably connected to at least one of the second link and the third link, and the second connection The lever is rotatably coupled to at least one of the first link and the third link, and the third link is rotatably coupled to at least one of the first link and the second link The tubular member may be at least one of one or more of the front leg, the rear leg, the first link, the second link, the third link, and the handle.

The tubular member of the present invention is a tubular member used in a baby carriage, and contains a resin and carbon fibers.

According to the present invention, the vibration absorbing function of the stroller can be effectively improved while effectively suppressing the weight of the stroller.

10‧‧‧ baby carriage

11‧‧‧ Baby stroller body

12‧‧‧ Ontology framework

14‧‧‧ Front foot

15‧‧‧ Front link

16‧‧‧ hind feet

17‧‧‧ Rear connecting material 17

19‧‧‧Handrail

20‧‧‧1st link

21‧‧‧Main connecting rod

22‧‧‧Upper connection

25‧‧‧2nd link

26‧‧‧Box body

26a‧‧‧ side

26b‧‧‧Connecting Department

27‧‧‧ Front connector

28‧‧‧After connecting material

29‧‧‧Connector

30‧‧‧3rd link

31‧‧‧ Spindle

32‧‧‧End members

34‧‧‧Axis components

38‧‧‧Guide members

41‧‧‧ pedestal

42‧‧‧Top frame

43‧‧‧ Linked Framework

45‧‧‧ Wheels

48‧‧‧Hands

48a‧‧‧Axis

48b‧‧‧Intermediate

50‧‧‧Cylinder members

50a‧‧‧ inner surface

50b‧‧‧ outer surface

50c‧‧‧ end face

50d‧‧‧through hole

50a1, 50b1‧‧‧ adjacent parts

51‧‧‧1st floor

52‧‧‧2nd floor

53‧‧‧3rd floor

55‧‧‧carbon fiber

56‧‧‧Resin

60‧‧‧ manufacturing equipment

61‧‧‧Mold

61a‧‧‧through hole

62‧‧‧heartwood

63, 63a, 63b, 63c‧‧‧ carbon fiber supply device

64, 64a, 64b, 64c‧‧‧ resin composition trough

65‧‧‧Resin composition

66‧‧‧ Pull out device

67‧‧‧cutting device

70‧‧‧End parts

71‧‧‧1st component

72‧‧‧ second component

74‧‧‧ base

74a‧‧‧Interface

75‧‧‧Internal Support Department

75a‧‧‧Internal opposite

75b‧‧‧through hole

76‧‧‧ External Support Department

76a‧‧‧External opposites

77‧‧‧Flange

78‧‧‧Fixed appliances

81‧‧‧1st component

82‧‧‧2nd component

83‧‧‧Flange

D1, d2, d3‧‧‧ length direction

Dc‧‧‧ circumferential direction

Dl‧‧‧ axis direction

Dt‧‧‧ thickness direction

Fig. 1 is a perspective view for explaining the overall configuration of a stroller according to an embodiment of the present invention.

Figure 2 is a side view showing the stroller.

Fig. 3 is a side view showing the stroller in a folded state.

Fig. 4 is a view showing the configuration of a cylindrical member.

Fig. 5 is a view for explaining an example of a method of manufacturing a tubular member.

Fig. 6 is a cross-sectional view showing a cylindrical member and an end member connected to the tubular member.

Fig. 7 is an exploded perspective view showing the tubular member and the end member.

Fig. 8 is a view showing a modification of the end member.

Fig. 9 is a view showing another modification of the end member.

Fig. 10 is a view showing another modification of the end member.

Fig. 11 is a view showing another modification of the end member.

Fig. 12 is a perspective view showing a modification of the stroller.

Detailed description of the preferred embodiment

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 7 are views for explaining an embodiment of the stroller of the present invention. 1 to 3 show the overall structure of the stroller. The stroller 10 of the present embodiment has a stroller body 11 that is folded and has legs 14, 16. Although the drawings are omitted, a detachable seat material having a cushioning function is attached to the stroller body 11. The infant is seated on the seat material. The stroller body 11 has a body frame 12 having a front leg 14 and a rear leg 16 and a handle 48 coupled to the body frame 12 to be rockable relative to the body frame 12. Wheels 45 are rotatably held at the lower ends of the rear legs 14 and the rear legs 16.

In the present embodiment, the stroller 10 is constructed to be foldable as is generally popular (for example, JP2006-117012A). Further, in the stroller 10 of the present embodiment, by swinging the handle 48 with respect to the main body frame 12, the following two methods are available: the operator (protector) grips the handlebar 48 from the back side of the infant to operate the stroller 10, and the baby carriage 10 is walked in the manner in which the infant is oriented toward the front (refer to the position of the handle 48 of FIG. 1); and the operator controls the baby carriage by gripping the handle 48 from the position of the forefoot side facing the infant 10, The stroller 10 is moved in such a manner that the rear leg side of the stroller 10 is in the forward direction (refer to the position of the handle 48 of FIG. 2).

Here, in the present specification, the terms "front", "back", "upper", "down", "front and rear direction", and "up and down direction" of the stroller and its constituent elements are not specifically indicated. In the meantime, it means "front", "back", "upper", "lower", "front and rear direction" and "up and down direction" based on the stroller in the unfolded state and its infants. More specifically, the "front-rear direction" means that the paper surface of FIG. 1 is connected to the lower left and upper right directions, and corresponds to the left-right direction of the paper surface in FIG. Further, when there is no special instruction, the "front" refers to the side on which the infant who has been riding is facing, the lower left side of the paper surface of Fig. 1, and the left side of the paper surface of Fig. 2 is the front side. On the other hand, the "up-and-down direction" means a direction orthogonal to the front-rear direction and orthogonal to the ground plane. Therefore, when the ground plane is a horizontal plane, the "up and down direction" means the vertical direction. Further, the "lateral direction" means the width direction, and the "front-rear direction" and the "up-and-down direction" mean orthogonal directions.

First, the stroller body 11 will be described as an overall configuration of the stroller. As shown in Fig. 1, the stroller 10 of the present embodiment has a structure that is substantially symmetrical about the center plane in the lateral direction of the front-rear direction. As described above, the stroller body 11 has a body frame 12 and a handle 48. As shown in FIG. 1 , the main body frame 12 includes a pair of front legs 14 respectively disposed on the left and right sides, a pair of rear legs 16 respectively disposed on the right and left sides, a pair of armrests 19 disposed on the right and left sides, and one left and right sides respectively. For the first link 20 .

As shown in FIG. 1 and FIG. 2, the upper end portion of the front leg 14 is connected to the corresponding side (left side or right side) in a rotatable (shakeable) manner. The front part of the hand 19. Similarly, the upper end portion of the rear leg 16 is coupled to the front portion of the armrest 19 disposed on the corresponding side (left side or right side) in a rotatable (shakeable) manner. Further, the upper portion of the first link 20 is rotatably (shaken) connected to the rear portion of the armrest 19 disposed on the corresponding side (left side or right side). As shown in FIG. 2, in the illustrated example, the first link 20 has a main link member 21 and an upper connecting member 22 fixed to an upper end portion of the main link member 21. The main link member 21 is formed in a cylindrical shape. A part of the upper connecting material 22 is inserted into the main link member 21. The first link 20 is connected to the rear end portion of the armrest 19 in a rotatable (shakeable) manner in the upper connecting member 22.

As shown in FIGS. 1 and 2, the body frame 12 has a second link 25 that is rotatably (tiltable) connected to the front leg 14, and is rotatably (tiltable) connected to the rear leg 16. The third link 30. The first link 20 is connected to at least one of the second link 25 and the third link 30 so as to be rotatable (shakeable). The second link 25 is connected to at least one of the first link 20 and the third link 30 so as to be rotatable (shakeable). The third link 30 is connected to at least one of the first link 20 and the second link 25 so as to be rotatable (shakeable).

As shown in FIG. 1, in the illustrated example, the frame member 26 and the front connecting member 27 and the rear connecting member 28 fixed to the frame member 26 are provided as members for forming the second link 25. The frame member 26 is formed of a tubular member that is bent. The front connecting material 27 and the rear connecting material 28 are formed of, for example, a resin molded product. A part of the rear connecting material 28 is inserted into the frame member 26 formed of the cylindrical member. The frame member 26 is formed in a U shape, and has a pair of side portions 26a extending in the front-rear direction and a connecting portion 26b that is connected to the front between the pair of side portions 26a. One end portion of the front connecting material 27 is rotatably The forefoot 14 is connected while the other end portion is fixed to the front portion of the side portion 26a. The rear connecting material 28 is fixed to the rear end portion of the side portion 26a. In this example, the second link 25 on the right side is formed by the side portion 26a of the frame member 26 and the front connecting member 27 and the rear connecting member 28 fixed to the right side of the side portion 26a on the right side. Similarly, the second link 25 on the left side is formed by the side portion 26a of the frame member 26 on the left side and the front connecting member 27 and the rear connecting member 28 fixed to the left side of the side portion 26a on the left side.

As shown in FIG. 1, in the illustrated example, the third link 30 has a main shaft member 31 that is rotatably coupled to the rear leg 16, and an end member 32 that is fixed to an upper end portion of the main shaft member 31. The main shaft member 31 is formed of a cylindrical member. A portion of the end member 32 is inserted into the spindle material 31. The main shaft member 31 is rotatably coupled to the rear leg 16 at a lower end portion.

In the illustrated example, the first link 20, the second link 25, and the third link 30 are rotatably connected to each other using the same shaft member 34. The shaft member 34 is a main link member 21 that penetrates the first link 20, an end member 32 that connects the third link 30, and a rear connecting member 28 that forms the second link 25. With this configuration, the first link 20, the second link 25, and the third link 30 are mutually rotatable about the same axis defined by the shaft member 34.

Moreover, in the illustrated example, as shown in FIGS. 1 and 2, the body frame 12 further has The base frame 41 and the upper frame 42 and the connecting frame 43 connecting the base frame 41 and the upper frame 42. A base fabric (not shown) is stretched over the frame body 26 and the base frame 41. The base fabric is a seat material (not shown) that simultaneously supports the frame member 26, the base frame 41, the upper frame 42, and the joint frame 43, and a cushioning function. The base frame 41 and the upper frame 42 are formed in a U shape together. The base frame 41 penetrates the shaft member 34 at both end portions thereof. Further, the base frame 41 is formed to be rotatable (shakeable) with respect to the frame member 26 or other constituent elements. The upper frame 42 is rotatably (tiltable) connected to the rear end portion of the armrest 19 at both ends thereof. The rotation axis of the armrest 19 with respect to the upper frame 42 is on the same line as the rotation axis of the armrest 19 with respect to the first link 20. A pair of coupling frames 43 are provided between the base frame 41 and the upper frame 42 so as to be spaced apart in the lateral direction. The joint frame 43 is rotatably connected to the base frame 41 and the upper frame 42 at both ends thereof.

As shown in FIG. 1, the main body frame 12 has a front connecting member 15 that connects between the pair of front legs 14, and a rear connecting member 17 that connects between the rear legs 16 of the team as a constituent element extending in the lateral direction. The front connecting material 15 functions as a foot. Further, a link connecting material 29 is provided between the pair of rear connecting members 28. The deformation of the stroller 10 in the lateral direction can be suppressed by the front connecting member 15, the rear connecting member 17, and the link connecting member 29. Further, a flexible guide member 38 is provided in a detachable manner between the pair of armrests 19.

The handle 48 is coupled to the body frame 12 formed by the above configuration in a swingable manner. As shown in Fig. 1, in the present embodiment, the handle 48 includes a pair of shaft portions 48a extending substantially in parallel with each other, and an intermediate portion 48b connecting the pair of shaft portions 48a. The handle 48 has a generally U-shaped shape. The handle 48 is coupled to the body frame 12 in a rotatable (shakeable) manner at both ends of the U-shape. Handle 48 The shaft member 34 is connected to the body frame 12 in a rotatable manner. Therefore, the first link 20, the second link 25, the third link 30, the base frame 41, and the handle 48 are formed to be rotatable relative to each other around the same axis defined by the shaft member 34.

In the stroller body 11, the handle 48 is formed between a first position (rearward position) in which the side view is inclined rearward from the vertical axis, and a second position (face-to-face advancing position) in which the vertical axis is inclined forward. Shake. In Fig. 1, the handle 48 is disposed at the first position. In Fig. 2, the handle 48 is disposed at the second position.

The stroller 10 having the above configuration can be folded by relatively rotating the constituent members. Specifically, the handle 48 disposed at the first position is pulled up toward the upper rear side, and then pressed downward, whereby the third link 30 is rotated in the clockwise direction in FIG. 2 with respect to the rear leg 16. With such an operation, the armrest 19 and the second link 25 are rotated in the clockwise direction in FIG. 2 with respect to the first link 20. By such an operation, the handle 48 and the forefoot 14 can be disposed substantially in parallel in the side view, and the arrangement position of the handle 48 can be lowered. As above, as shown in FIG. 3, the stroller 10 can be folded. In the folded state of FIG. 3, the size along the front-rear direction and the up-and-down direction of the stroller 10 can be miniaturized. On the other hand, in terms of unfolding the stroller 10 from the folded state, it is only necessary to go through a procedure reverse to the aforementioned folding operation.

By the way, the stroller 10 that the infant rides on will be affected by the road surface during walking. Therefore, in order to suppress the transmission of the flush of infants and toddlers, the conventional stroller is provided with a mechanism for absorbing vibration. In general, the vibration absorbing mechanism may be exemplified by the provision of a suspension mechanism for the wheel holding unit or the addition of a special vibration absorbing material for the seat material of the infant. However, the vibration absorbing mechanism like this not only increases the manufacturing cost, but also causes the weight of the stroller. The weight of the stroller can cause the operability of the stroller to deteriorate and impair the improvement of the vibration absorbing function.

On the other hand, as described below, the stroller 10 of the present embodiment is effective in improving the vibration absorbing function of the stroller 10 while suppressing the weight of the stroller 10. In other words, the stroller 10 of the present embodiment uses the tubular member 50 (see FIG. 4) containing the carbon fibers 55 and the resin 56 as one or more members for forming the above-described respective constituent elements. Specifically, the tubular member 50 including the carbon fiber 55 and the resin 56 is used as the front leg 14 , the rear leg 16 , the rear connecting member 17 of the stroller 10 , the main link member 21 forming the first link 20 , and The frame member 26 of the second link 25, the link connecting member 29, the main shaft member 31 forming the third link 30, the base frame 41, the upper frame 42, the connecting frame 43, and the handle 48 are formed. At least part.

The tubular member 50 includes layers 51, 52, and 53 formed of so-called carbon fiber reinforced plastics (CFRP: Carbon Fiber Reinforced Plastics). The carbon fiber reinforced plastic is a composite material of carbon fiber 55 and resin 56. The carbon fiber reinforced plastic layers 51, 52, and 53 are cylindrical layers that occupy a part of the thickness direction of the tubular member 50.

As the carbon fiber 55, a known fiber, for example, a fiber (bituminous fiber) formed of a petroleum-based raw material such as PAN-based fiber (polyacrylonitrile fiber) or a coal tar can be used. The carbon fiber 55 has a high specific strength and a specific modulus, and is superior in corrosion resistance. In particular, the carbon fiber 55 is superior in vibration attenuation in relation to a higher specific modulus. Further, the carbon fiber 55 has a small linear expansion coefficient and excellent stability, and is excellent in fatigue characteristics.

Resin 56 is a layer that functions as a binder. The resin 56 may, for example, be a thermosetting resin such as an unsaturated polyester resin, a phenol resin, an epoxy resin, a vinyl ester resin, a bismaleimide resin, a cyanate resin, or a polyimide resin. The tubular member 50 used as the resin 56 as the thermosetting resin is excellent in crack resistance and can have sufficient strength.

Further, as the resin 56, a nylon resin, a polypropylene resin, a polyphenylene sulfide resin, a polyetherimide, a polycarbonate resin, a polyether terephthalate resin, a polyether ketone resin, and a poly A thermoplastic resin such as an ether ketone ketone resin. The tubular member 50 using a thermoplastic resin as the resin 56 can be applied to bending processing. For the purpose of imparting designability or achieving a folding operation, a tubular member to which bending is applied is often used as each constituent element of the stroller 10. Therefore, the tubular member 50 using the thermoplastic resin is suitable as a constituent element of the stroller 10.

The tubular member 50 including the carbon fiber 55 and the resin 56 is lighter and has superior softness than a conventional metal tube formed of an aluminum alloy or the like. Therefore, by applying the tubular member 50 to the stroller 10, the weight of the stroller 10 can be reduced, and the vibration absorbing function of the stroller 10 can be improved. In particular, since the vibration absorbing function of the stroller 10 can be improved by the structure of the stroller 10, it is possible to eliminate the necessity of providing the stroller 10 with a special mechanism, member, material, and the like for absorbing vibration. Therefore, the tubular member 50 including the carbon fiber 55 and the resin 56 can maintain strength and achieve a large weight reduction as compared with a conventional baby carriage using a metal tube. First, the improvement of the vibration absorbing function can be achieved by the weight reduction of the stroller 10. As a result, not only the weight can be prevented, but also the weight can be actively achieved, and the vibration absorbing function of the stroller 10 can be made lighter and softer by the constituent elements. The two aspects of the degree complement each other even more. The above effects have exceeded the effects in the range which can be predicted by the technical level of the conventional technique which is attempted to improve the vibration absorbing function with the weighting, and also have remarkable and different properties.

As an example shown in FIG. 6, the tubular member 50 has a plurality of layers 51, 52, and 53 disposed at different positions in the thickness direction dt, and each of the layers 51, 52, and 53 includes carbon fibers 55. However, the length directions of the carbon fibers 55 between the plurality of layers 51, 52, 53 are different from each other. The carbon fiber reinforced plastic layer has a high elastic modulus in the longitudinal direction of the carbon fiber and a high strength in the longitudinal direction of the carbon fiber. Therefore, by adjusting the orientation of the carbon fibers in the longitudinal direction, anisotropy can be imparted to the elastic modulus and strength of the tubular member 50. Therefore, the cylindrical member 50 including the plurality of layers 51, 52, and 53 having different longitudinal directions of the carbon fibers 55 can exhibit excellent mechanical properties as a constituent of the baby carriage 10 to which the tubular member 50 is applied. Therefore, the cylindrical member 50 can have both sufficient rigidity and sufficient vibration absorbing function with respect to the external force acting on the stroller 10 from various directions.

In particular, in the example shown in FIG. 4, the tubular member 50 has the first layer 51 in which the longitudinal direction d1 of the carbon fiber 55 is along the axial direction dl of the tubular member 50, and the longitudinal direction d2 of the carbon fiber 55 is along the cylindrical member. The second layer 52 of the circumferential direction dc of 50 and the longitudinal direction d3 of the carbon fiber 55 are the third layer 53 along the axial direction d1 of the tubular member 50. The second layer 52 is located between the first layer 51 and the third layer 53 in the thickness direction dt of the tubular member 50. In the cylindrical member 50 shown in Fig. 4, the first layer 51 is located at the innermost layer to form the inner surface 50a of the tubular member 50. On the other hand, the third layer 53 is located at the outermost layer and forms a cylindrical shape. The outer surface 50b of the member 50. Further, the second layer 52 is adjacent to both the first layer 51 and the third layer 53. Each of the first layer 51, the second layer 52, and the third layer 53 is formed as a layer having a cylindrical profile.

Here, the axial direction d1 of the tubular member 50 is a direction in which one of the tubular members 50 is connected to the opening as shown in FIG. 4 . The circumferential direction dc of the tubular member 50 is a circumferential direction orthogonal to the axial direction d1 and surrounding the axial direction d1 as shown in FIG. 4 . As shown in FIG. 4, the thickness direction dt of the tubular member 50 is a direction orthogonal to both the axial direction d1 and the circumferential direction dc. In the cylindrical tubular member 50 shown in FIG. 4, the direction orthogonal to the axial direction d1 coincides with the direction in which the center of the tubular member 50 extends in the radial direction.

In addition, the term "the longitudinal direction of the carbon fibers is along the axial direction of the tubular member" does not mean that the longitudinal directions d1 and d3 of all the carbon fibers 55 in the layers 51 and 53 to be targeted must be strictly parallel to the cylindrical member 50. In the axial direction dl, the longitudinal directions d1 and d3 of the carbon fibers 55 in the layers 51 and 53 to be targeted are inclined so as to be inclined at an angle of 20° or less with respect to the axial direction d1 of the tubular member 50. Similarly, the "longitudinal direction of the carbon fibers is along the circumferential direction of the tubular member", and does not mean that the longitudinal direction d2 of all the carbon fibers 55 in the layer 52 to be targeted must be strictly parallel to the circumferential direction dc of the tubular member 50. In addition, the longitudinal direction d2 of the carbon fiber 55 in the layer 52 to be targeted is inclined so as to be at an angle of 20° or less with respect to the axial direction d1 of the tubular member 50.

The cylindrical member 50 including the first to third layers 51, 52, and 53 has a sufficient vibration absorbing function and strength for the following forces. The force is a force that compresses the tubular member 50 in the axial direction d1 and a compressive force and a tensile force that causes the tubular member 50 to move in the axial direction dl. In addition, the tubular member 50 including the first to third layers 51, 52, and 53 has a sufficient vibration absorbing function and strength even for the force of the curved tubular member 50. Therefore, the tubular member 50 including the first to third layers 51, 52, and 53 is preferably used to form a compressive force and a tensile force which are easily applied to the axial direction dl, and are easily applied to be bent. The constituent elements of the force, such as the material forming the front leg 14, the rear leg 16, and the handle 48.

The tubular member 50 including the first to third layers 51, 52, and 53 has excellent compressive force and tensile force in the axial direction dl of the tubular member 50, and excellent force for bending the tubular member 50. The detailed mechanical principle of vibration absorption function and strength is still unclear, but the following points are presumed to be one of the important reasons. However, the present invention is not limited to the following speculations.

First, the compressive force and the tensile force of the tubular member 50 in the axial direction d1 are the stress applied to the barrel member 50 along the axial direction dl of the tubular member 50. Next, the force to bend the tubular member 50 is also the stress applied to the tubular member 50 along the axial direction dl of the tubular member 50. On the other hand, the carbon fiber 55 exhibits excellent elasticity and strength in its longitudinal direction. Further, in the first layer 51 and the third layer 53, the carbon fibers 55 extend along the axial direction d1 of the tubular member 50. Therefore, the first layer 51 and the third layer 53 of the tubular member 50 exhibit a sufficiently excellent vibration absorbing function against the compressive force and the tensile force of the tubular member 50 in the axial direction d1 and the force of the tubular member 50 to be bent. And full strength. In particular, the first layer 51 and the third layer 53 are disposed apart from each other in the thickness direction dt via the second layer 52. Therefore, the external force can be dispersed in the thickness direction of the tubular member 50. Dt. Thereby, it is possible to effectively prevent the cylindrical member 50 from locally applying a large force to cause the destruction of the tubular member 50. The carbon fiber 55 of the second layer 52 extends in the circumferential direction dc of the tubular member 50, so that the deformation of the cylindrical member 50 toward the diameter and the deformation toward the diameter are restricted, and the cylindrical member 50 can be effectively prevented from being along. The axis direction dl breaks.

However, as confirmed by the inventors of the present invention, the carbon fibers 55 in the first layer 51 and the third layer 53 are not inclined at an angle of more than 20° with respect to the axial direction dl of the tubular member 50, and are in the second layer 52. In the case where the carbon fiber 55 is not inclined at an angle greater than 20° with respect to the circumferential direction dc of the tubular member 50, the cylindrical member 50 can be compressed against the axial direction dl of the tubular member 50, and the bending force and bending are required. The force of the tubular member 50 exhibits a sufficient vibration absorbing function and sufficient strength. On the other hand, the carbon fibers 55 in the first layer 51 and the third layer 53 are largely inclined with respect to the axial direction d1 of the tubular member 50, or the carbon fibers 55 in the second layer 52 are opposed to the circumferential direction of the cylindrical member 50. When the dc is largely inclined, a torsion force which causes the cylindrical member 50 to break is generated in the tubular member 50.

Next, an example of a method of manufacturing the tubular member 50 will be described with reference to Fig. 5 . In the manufacturing method described below, the tubular member 50 is continuously produced by a pultrusion method, and the produced tubular member 50 does not have a seam. The obtained tubular member 50 can be made to have excellent resistance to cracking by the absence of seams.

First, a manufacturing apparatus 60 for manufacturing the tubular member 50 will be described. As shown in FIG. 5, the manufacturing apparatus 60 for manufacturing the cylindrical member 50 has a mold 61 in which a through hole 61a is formed, and a core that extends into the mold 61. The material 62; the carbon fiber supply device 63 that sends out the carbon fiber 55; the resin composition groove 64 that holds the resin composition 65; the pull-out device 66 that pulls out the tubular member 50; and cuts the tubular member 50 to a desired length. Device 67. The manufacturing apparatus 60 shown in the drawing is provided with three carbon fiber supply devices 63a, 63b, and 63c and three resin composition grooves 64a and 64b corresponding to the first to third layers 51, 52, and 53 of the tubular member 50 to be produced. , 64c. The hole shape of the through hole 61a of the mold 61 is complementary to the outer shape of the cylindrical member 50 to be fabricated. The outer shape of the heart material 62 is complementary to the inner shape of the tubular member 50 to be fabricated. That is, the tubular member 50 to be produced has a shape corresponding to a shape having a gap with the through hole 61a of the mold 61 and the core material 62.

Next, a method of manufacturing the tubular member 50 using the manufacturing apparatus 60 will be described. As shown in FIG. 5, first, the carbon fiber 55 and the resin composition 65 are disposed on the core material 62. Specifically, the carbon fiber 55 is sent out by the first carbon fiber supply device 63a. The carbon fiber 55 sent out from the first carbon fiber supply device 63a passes through the resin composition groove 65 in the first resin composition groove 64a. Therefore, the resin composition 65 adheres to the periphery of the carbon fiber 55 disposed on the core material 62. The carbon fiber 55 has its longitudinal direction disposed on the core material 62 along the longitudinal direction of the core material 62.

Next, the carbon fiber 55 is sent out by the second carbon fiber supply device 63b, and the carbon fiber 55 is stored in the resin composition 65 stored in the second resin composition groove 64b. The carbon fiber 55 from the second carbon fiber supply device 63b is laminated with the resin composition 65 in the second resin composition groove 64b, and is laminated on the carbon fiber 55 from the first carbon fiber supply device 63a disposed on the core material 62 and stored therein. The resin composition 65 in the first resin composition groove 64a is on the layer. As shown in Figure 5, The carbon fibers 55 from the second carbon fiber supply device 63b are arranged in a spiral shape around the periphery of the core material 62.

Next, the carbon fiber 55 is sent out by the third carbon fiber supply device 63c, and the carbon fiber 55 is stored in the resin composition 65 stored in the third resin composition groove 64c. The carbon fiber 55 from the third carbon fiber supply device 63c is laminated with the resin composition 65 in the third resin composition groove 64c, and is stacked on the carbon fiber 55 from the second carbon fiber supply device 63b disposed on the core material 62 and stored therein. The resin composition 65 in the second resin composition groove 64b is on the layer. As shown in FIG. 5, the carbon fiber 55 from the third carbon fiber supply device 63c is disposed on the core material 62 along the longitudinal direction of the core material 62.

However, the carbon fibers 55 sent from the first to third carbon fiber supply devices 63a to 63c are the carbon fibers 55 that form the first to third layers 51, 52, and 53 of the tubular member 50. Therefore, as the carbon fibers 55 sent from the first to third carbon fiber supply devices 63a to 63c, as described above, known carbon fibers such as PAN fibers or pitch fibers can be used. The carbon fibers 55 sent from the first to third carbon fiber supply devices may be the same type of carbon fibers or different types of carbon fibers.

Further, the resin composition 65 stored in the first to third resin composition grooves 64a to 64c is the resin 56 that forms the first to third layers 51, 52, and 53 of the tubular member 50, respectively. Therefore, the resin composition 65 stored in the first to third resin composition grooves 64a to 64c may have the above-mentioned thermosetting or thermoplastic resin as a composition containing, for example, a solvent. The resin composition 65 stored in the first to third resin composition grooves 64a to 64c may be the same type of resin or may contain different types of resins.

The laminate including the layers of the carbon fibers 55 and the resin composition 65 is supplied to the gap between the core material 62 and the mold 61. In this mold 61, the resin composition is dried and hardened as needed. As a result, the tubular member 50 is fabricated on the core material 62. The produced tubular member 50 is continuously pulled out from the core material 62 by the drawing device 66, and is cut to a desired length by the cutting device 67. The tubular member 50 can be manufactured as above.

By the way, in general, a tubular member that is used as a constituent element of a stroller, typically thinning the thickness of the metal tube, will cause the metal tube to be used at the end of the stroller in use. A crack is produced. In the cylindrical member 50 including the carbon fiber 55 and the resin 56 described above, cracks are likely to occur at the interface between the carbon fiber 55 and the resin 56, and as a result, the tendency of cracking at the end portion is more remarkable.

On the other hand, in the case where a tubular member is used as a constituent element of the stroller, the tubular member does not become a constituent member alone, and in most cases, it is formed together with the end member fixed at the end portion thereof. A constituent element. The end member is usually formed of a resin molded article, and it is easy to impart a desired shape. Further, the end member is formed at a joint with other constituent elements in place of a metal tube or the like which is limited in processing. Moreover, the end member improves the safety or design of the stroller by covering the end faces of the tubular member. In the illustrated stroller 10, for example, the main link member 21 forming the first link 20 corresponds to a tubular member, and the upper link member 22 corresponds to an end member. Further, the frame member 26 forming the second link 25 corresponds to a tubular member, and the rear connecting member 28 corresponds to an end member. Further, the main shaft member 31 of the third link 30 corresponds to a tubular member, and the end member 32 corresponds to an end member.

Recently, the inventors of the present invention have repeatedly reviewed the method of fixing the end member to the tubular member, and have found that the occurrence of cracking of the opposite end portion of the tubular member can be extremely effectively prevented by maintaining the predetermined fixed state. In other words, by using the fixing method described below, the cylindrical member 50 which is more likely to be broken than the conventional metal tube can be easily suppressed, and at the same time, it can be stably used as a baby carriage. 10 constituent elements. Further, by using the fixing method described below, the thickness of the tubular member 50 can be made thinner, and the weight of the stroller 10 can be reduced and the material cost can be reduced.

Hereinafter, a method of fixing the tubular member 50 of the end member 70 will be described mainly with reference to Figs. 6 and 7 . However, the tubular member 50 and the end member 70 shown in FIGS. 6 to 9 are combined to form the forefoot 14 shown in FIGS. 1 to 3. The forefoot 14 is coupled to the armrest 19 at the end member 70, and a caster for holding the wheel 45 is attached to the lower end of the tubular member 50.

As shown in FIGS. 1 to 3 and 6, the end member 70 is fixed to one of the open ends of the tubular member 50. As shown in FIGS. 6 and 7 , the end member 70 includes a first member (main member) 71 and a second member (other member, auxiliary member) 72 formed separately from the first member 71 . That is, the end member 70 is formed of two members.

As shown in FIGS. 6 and 7 , the first member 71 has a base portion 74 and an internal support portion 75 formed integrally with the base portion 74 . In the illustrated example, the base portion 74 is a portion that is connected to the armrest 19. The inner support portion 75 is formed in a cylindrical shape or a column shape and extends from the base portion 74. The inner support portion 75 is inserted into the cylindrical member 50 by one of the openings of the tubular member 50. Graphical example The inner support portion 75 is formed in a cylindrical shape. The outer peripheral surface of the cylinder forming the inner support portion 75 is formed with an inner opposing surface 75a which is the inner side in the thickness direction dt of the tubular member 50, and is in the circumferential region and in the cylindrical member 50. A portion 50a1 (refer to FIG. 6) adjacent to the end surface 50c of the cylindrical member 50 among the inner surfaces 50a is opposed to each other.

As shown in FIGS. 6 and 7 , the second member 72 has an outer support portion 76 and a flange portion 77 integrally formed with the outer support portion 76 . The outer support portion 76 is formed in a tubular shape, and one end portion of the tubular member 50 is inserted into the outer support portion 76. In the illustrated example, the outer support portion 76 is formed in a cylindrical shape in accordance with the cylindrical shape of the tubular member 50. The inner peripheral surface of the cylinder forming the outer support portion 76 is formed with an outer opposing surface 76a which is the outer side in the thickness direction dt of the tubular member 50, and is in the circumferential region, and is in the cylinder A portion 50b1 (refer to FIG. 6) adjacent to the end surface 50c of the cylindrical member 50 in the outer surface of the member 50 is opposed to each other. The flange portion 77 extends from the end of the outer support portion 76 toward the inner side in the thickness direction dt of the tubular member 50. The flange portion 77 is opposed to the end surface 50c of the tubular member 50 by the outer side in the axial direction d1 of the tubular member 50. Moreover, as shown in FIG. 6, the flange part 77 is formed in the circumferential shape. The inner support portion 75 of the first member 71 penetrates the second member 72 and extends into the tubular member 50. The flange portion 77 is sandwiched between the base portion 74 of the first member 71 and the end surface 50c of the tubular member 50.

As clearly shown in Fig. 7, the inner support portion 75 of the end member 70 is formed with a pair of through holes 75b. Further, a pair of through holes 50d are also formed in the tubular member 50. In a state where the end member 70 is attached to the end portion of the tubular member 50, one of the end members 70 is opposed to one of the through hole 75b and the cylindrical member 50. The through holes 50d are arranged in a straight line. Further, as shown in FIG. 6, the fixing tool 78 formed by a pin or a rivet or the like penetrates through the through holes 75b and 50d and is fixed to the tubular member 50. In the above configuration, the end member 70 is fixed to the end of the tubular member 50.

As described above, the end member 70 includes: an inner support portion 75 having an inner opposing surface 75a opposed to the inner surface 50a of the tubular member 50 in the circumferential portion; and an outer support portion 76 having a circumferential shape The region and the outer surface 50b of the tubular member 50 are opposed to the outer facing surface 76a. As a result of the confirmation by the inventors of the present invention, by attaching the end member 70 to the end portion of the tubular member 50, the crack of the tubular member 50 can be effectively prevented, and the crack of the tubular member 50 is from the end surface 50c thereof. Cracked out. The detailed reason for the function of preventing cracking by the end member 70 is not clear, but in the region adjacent to the end surface 50c of the tubular member 50, the expansion of the tubular member 50 can be restricted by the external support portion 76, and by The inner support portion 75 can restrict the wall portion of the tubular member 50 from falling toward the inside (buckling) is presumed to be one of the important reasons.

When the rupture of the tubular member 50 can be effectively prevented by the end member 70, the above-described tubular member 50 having a superior vibration absorbing function but on the other hand, the metal tube is easily broken can be more stably used. Further, the thickness of the tubular member 50 can be reduced. The thinned tubular member 50 can be made lighter and more excellent in flexibility. As a result, by using the tubular member 50 in the combination with the end member 70 for the stroller 10, it is possible to improve the vibration absorbing function while avoiding the weight of the stroller 10.

If the above embodiment is used, carbon fiber 55 can be used. The tubular member 50 of the resin 56 is substituted for a conventional metal tube. The tubular member 50 containing the carbon fiber 55 and the resin 56 has a light weight and superior flexibility. Therefore, the vibration absorbing function of the stroller 10 can be improved while pursuing the weight reduction of the stroller 10. In particular, since the vibration absorbing property of the stroller 10 can be improved by the frame structure itself of the stroller 10, it is possible to eliminate the necessity of providing a special mechanism, a member, a material, and the like for absorbing the vibration in the stroller. Therefore, the tubular member 50 containing the carbon fiber 55 and the resin 56 can maintain the strength and the weight can be greatly reduced as compared with the conventional metal pipe. According to the above technique, not only the weight can be prevented, but also the weight can be actively reduced, and the vibration absorbing function of the stroller 10 can be greatly improved.

However, various modifications can be made without departing from the spirit and scope of the invention. An example of a modification will be described below with reference to the drawings. In the following description and the drawings used in the following description, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and the description will be omitted, and the same reference numerals will be used for the corresponding portions in the above-described embodiments. .

First, a specific example of the tubular member 50 is exemplified in the above embodiment, but the tubular member 50 may have a structure different from that of the above embodiment. For example, the longitudinal direction of the carbon fibers 55 in each of the layers 51, 52, and 53 may be changed to be different from the above-described embodiment. Further, the tubular member 50 may include another one or more layers in addition to the first layer 51, the second layer 52, and the third layer 53. The other layer may be a layer containing the carbon fibers 55 and the resin 56, a layer containing fibers other than the carbon fibers 55 and the resin 56, or a simple resin layer.

Further, the tubular member 50 including the carbon fiber 55 and the resin 56 may be formed in a straight line shape, or may be curved at least in a portion such as a bending process. When the bending process is applied to the tubular member 50, the resin 56 of the tubular member 50 is preferably a thermoplastic resin. The tubular member 50 using the thermoplastic resin can be prevented from being cracked by the tubular member 50 by bending in a heated state.

Further, the end member 70 having the inner support portion 75 and the outer support portion 76 is not limited to the examples shown in FIGS. 6 and 7, and can be applied to the stroller 10 in various forms. For example, the end member 70 shown in FIGS. 6 and 7 has the first member 71 including the base portion 74 and the internal support portion 75, and the second member 72 including the external support portion 76 and the flange portion 77, but Limited to such an example, as shown in FIG. 8 , the end member 70 may have a first member 81 including a base portion 74 and an external support portion 76 , and a second member 82 including an inner support portion 75 and a flange portion 83 . In the example shown in FIG. 8, the base portion 74 of the first member 81 and the outer support portion 76 are integrally formed, and the outer support portion 76 is formed with an outer facing surface 76a. Further, the inner support portion 75 and the flange portion 83 of the second member 82 are integrally formed, and the inner support portion 75 is formed with an inner opposing surface 75a. The inner support portion 75 of the second member 82 is formed in a tubular shape or a columnar shape. The flange portion 83 of the second member 82 extends outward from the end portion of the inner support portion 75 in the thickness direction of the tubular member 50. The flange portion 83 is formed to face the end surface 50c of the tubular member 50. The outer support portion 76 of the first member 81 is formed in a tubular shape. The second member 82 is disposed inside the outer support portion 76 formed in a tubular shape. The base portion 74 has a bottom surface portion 74b that is a flange portion 83 that grips the second member 82 between the end surface 50c of the tubular member 50. However, in the example shown in FIGS. 6 and 7, the outer support portion 76 is shorter than the inner support portion 75, but in the example shown in FIG. 8, the outer support portion 76 is longer than the inner support portion 75. The first member 81 is transparent The fixing device 78 is fixed to the tubular member 50, and the first member 81 holds the second member 82 between the tubular member 50 and the tubular member 50. The same effect as the above-described embodiment can be achieved by the end member 70 as shown in FIG. 8, that is, the effect of effectively preventing the crack of the tubular member 50.

Further, although the end member 70 shown in FIGS. 6 to 8 has the first member 71 and the second member 72 which are separately formed, the invention is not limited to this example. As shown in FIGS. 9 and 10, the end member 70 is also It can be formed as a single component. In the end member 70 shown in FIG. 9 or 10, both the inner support portion 75 and the outer support portion 76 are protruded from the base portion 74. The end surface 50c of the tubular member 50 is formed to face the support portion surface 74a formed between the inner support portion 75 and the outer support portion 76. However, in the example shown in FIG. 9, although the internal support portion 75 is longer than the external support portion 76, the internal support portion 75 may be shorter than the external support portion 76 as shown in FIG. With the end member 70 as described above, the same effects as those of the above-described embodiment can be achieved, that is, the crack of the tubular member 50 can be effectively prevented.

Further, in the combination of the end member 70 and the tubular member 50, the cylindrical member 50 is shown as being transmitted through the end member 70 and connected to another component such as the armrest 19. However, as shown in FIG. 11, the tubular member 50 may be connected to other components by the fixing means 79 for fixing the end member 70 to the tubular member 50. That is, the tubular member 50 shown in FIG. 11 is connected to other components of the stroller 10 at the portion where the end member 70 is provided. In the example shown in Fig. 11, the tubular member 50 is formed in Figs. 1 to 3 The shaft portion 48a of the handle 48 is shown, and the end member 70 is a cover member that constitutes an opening that plugs the end of the tubular member 50. In such a tubular member 50, there is a possibility that cracks may occur due to cracking of the end surface 50c during use. Further, the end member 70 shown in Fig. 11 can achieve the same operational effects as those of the above-described embodiment, that is, the cylindrical member 50 can be effectively prevented from being broken.

Further, the overall configuration of the stroller 10 described in the above embodiment is merely a single example. For example, the stroller can be configured such that the stroller can be folded in the front-rear direction and then folded in the front-rear direction to reduce the width in the width direction, as in the stroller disclosed in Japanese Laid-Open Patent Publication No. 2011-148454. Specifically, the member extending in the width direction of the stroller 10, that is, the intermediate portion 48b of the handle 48, the front connecting member 15, the rear connecting member 17, the link connecting member 29, the base frame 41, and the upper frame 42 have The hinge (the meandering point) may be such that the members are folded in the front-rear direction as described above, and then the hinge may be bent around the hub.

Further, in the stroller 10 described in the above embodiment, the gripper 48 is configured to be swingable between the push-back position (rear position) and the face-to-face advance position (front position). That is, in the above-described embodiment, an example is shown in which the handle 48 is provided separately from the first link 20, and the handle 48 is swingable with respect to the body frame 12 of the stroller body 11. However, for example, as shown in Fig. 12, the stroller 10 may be configured such that the handle 48 is fixed at the rear position and cannot be rocked by the push-back position. In the example shown in Fig. 12, a pair of first links 20 are formed by a portion corresponding to the lower end portion of the shaft portion 48a of the handle 48. In other words, the first link 20 is configured to extend over the joint with the armrest 19 to form a part of the handle 48.

However, several modifications have been described in the above-described embodiments, but it is of course possible to apply a plurality of modifications as appropriate.

Claims (15)

A baby carriage having a cylindrical member including carbon fibers and a resin, the cylindrical member having: a first layer in which a longitudinal direction of the carbon fibers is not inclined at an angle greater than 20° with respect to an axial direction of the cylindrical member; Wherein the longitudinal direction of the carbon fiber is not inclined at an angle greater than 20° with respect to the circumferential direction of the cylindrical member; and the third layer, wherein the longitudinal direction of the carbon fiber is not greater than 20° with respect to the axial direction of the cylindrical member The second layer is located between the first layer and the third layer in the thickness direction of the tubular member. The baby carriage of claim 1, wherein the cylindrical member includes a plurality of layers disposed at different positions in the thickness direction, and each layer includes carbon fibers, and the length of the carbon fibers between the plurality of layers The directions are different from each other. The baby carriage of claim 1, wherein the cylindrical member has a first layer in which a longitudinal direction of the carbon fiber is along an axial direction of the cylindrical member, and a second layer in which a length direction of the carbon fiber is along a circumferential direction of the tubular member; and a third layer, wherein a longitudinal direction of the carbon fiber is along an axial direction of the tubular member. The baby carriage of claim 1, wherein the aforementioned resin is a thermosetting resin. The baby carriage of claim 1, wherein the resin is a thermoplastic resin, and the cylindrical member is curved. The baby carriage of claim 1, wherein the tubular member is a member made of a carbon fiber reinforced plastic formed into a tubular shape by a pultrusion method. The stroller of claim 1, further comprising an end member that is fixed to at least one of the open ends of the tubular member, and the end member has an internal support portion that is inserted into The inside of the cylindrical member has an inner facing surface that faces the inner surface of the tubular member in a circumferential region; and an outer support portion having a circumferential region and the aforementioned The outer surface of the tubular member is in an opposite outer facing surface. The baby carriage according to claim 7, wherein the end member has a first member having the inner support portion and a base portion integrally formed with the inner support portion, and the second member is formed separately from the first member. And an external support portion and a flange portion extending from an end portion of the external support portion and facing an end surface of the tubular member. The stroller of claim 7, wherein the aforementioned end member has: a first member having the aforementioned external support portion, and the aforementioned external support a base portion integrally formed; the second member is formed separately from the first member, and has the inner support portion and an end portion of the inner support portion extending to face the end surface of the tubular member The flange portion. The baby carriage according to claim 7, wherein the end member further has a base integrally formed on both the inner support portion and the outer support portion. The stroller of claim 1, further comprising a front leg, a rear leg, and a handle, wherein the tubular member is at least one of one of the front leg, the rear leg, and the handle. The stroller of claim 1, comprising: a front foot and a rear leg; an armrest that is rotatably coupled to the front foot and the rear leg; a first link that is rotatably coupled to the armrest; and a second link that is a third link that is rotatably coupled to the rear leg, the first link being rotatably coupled to at least one of the second link and the third link The second link is rotatably connected to at least one of the first link and the third link, and the third link is rotatably coupled to the first link and the second At least one of the link members is connected, and the tubular member is at least one of the front leg, the rear leg, the first link, the second link, and the third link. section. The stroller of claim 1, comprising: a pair of forefoot and a pair of rear legs; a pair of armrests rotatably coupled to the forefoot and the rear leg; and a pair of first links are rotatably coupled The pair of second links are rotatably connected to the front legs; the pair of third links are rotatably connected to the rear legs, and the rear connecting members are connected to the pair of rear legs; The link connecting material connects the pair of second links, and the first link is rotatably connected to at least one of the second link and the third link, and the second link The lever is rotatably connected to at least one of the first link and the third link, and the third link is rotatably coupled to the first link and the second link At least one of the rods is connected to the tubular member, wherein the front leg, the rear leg, the first link, the second link, the third link, the rear connecting member, and the link connecting member are formed At least one of the above. The stroller of claim 1, comprising: a front foot and a rear leg; an armrest that is rotatably coupled to the front foot and the rear leg; a first link that is rotatably coupled to the armrest; and a second link that is Rotatingly connecting with the front foot; the third link is rotatably coupled to the rear foot; and The handle is rotatably connected to at least one of the first link, the second link, and the third link, and the first link is rotatably and the second At least one of the link and the third link is connected, and the second link is rotatably connected to at least one of the first link and the third link, and the third connection The lever is rotatably connected to at least one of the first link and the second link, and the tubular member forms the front leg, the rear leg, the first link, and the second link And at least one of the third link and the handle. A cylindrical member is a cylindrical member used in a baby carriage, and comprises a resin and carbon fibers, the cylindrical member having: a first layer, wherein a length direction of the carbon fiber is not greater than 20° with respect to an axial direction of the cylindrical member An angle of inclination; a second layer, wherein a length direction of the carbon fiber is not inclined at an angle greater than 20° with respect to a circumferential direction of the cylindrical member; and a third layer, wherein a length direction of the carbon fiber is an axial direction of the cylindrical member The second layer is not inclined at an angle greater than 20°, and the second layer is located between the first layer and the third layer in the thickness direction of the tubular member.