JP2020082844A - Front side child riding device for bicycle and handlebar structure of bicycle using the same - Google Patents

Abstract

To provide a front side child riding device for bicycle, capable of making a child ride on a bicycle safely and comfortably and avoid degradation of the operability of the bicycle, and to provide a handlebar structure of the bicycle, capable of being suitably mounted with the front side child riding device.SOLUTION: A front side child riding device 1 for a bicycle includes: a seat body 10 with a seat part 11 for a child facing ahead to sit down and a backrest part 12 provided on a rear end of the seat part 11; an attachment part 15 which is formed on an undersurface of the seat part 11 and permits attachment onto an upper part of a stem 5 of a bicycle; side plates provided sides of the seat body 10 in a vertical direction; and a headrest 20 which is provided above the side plates and moves slidably relative to the side plates in the vertical direction.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front child seat for a bicycle, which is a front side of a bicycle and is attached to a handle, and a handle structure of a bicycle on which the front child seat for a bicycle is suitably mounted.

When going out with a child by using a bicycle, it is general that the child is seated on a child's seat mounted on the front or rear luggage carrier of the bicycle and then moved.
Patent Document 1 discloses a technique for riding a bicycle on a child (also referred to as a child ride, a child seat, a child seat, an infant seat, or the like).
The bicycle child rest disclosed in Patent Document 1 is a seat that is attached to a bicycle handle on the front side of the bicycle, and the seat is disposed between the left and right rising portions of a handlebar of the bicycle having rising portions on the left and right sides. It is a type where the bottom of the seat is attached to the bicycle with bolts or the like. This seat includes a seat body, leg mounting members provided on the lower side of the front part of the seat body, a headrest provided on the rear end side of the seat body, and a grip bar provided on the front upper part of the seat body. Is equipped with.

When a child is placed in this seat, for example, a bicycle driver (adult) lifts the child and lifts it up, and the driver is placed so that the child comes vertically above the child for the bicycle at that height position. When approaching a bicycle, the driver lowers the child downward so that the child sits on the seat body.

JP, 2011-88536, A

The bicycle front child rest disclosed in Patent Document 1 described above allows a child to be mounted safely and comfortably, and an adult can operate the bicycle in that state.
However, a child riding a front child for a bicycle often weighs around 10 kg, and a relatively heavy object is to be mounted near the handlebar of the bicycle. There was concern that it would lead to a decrease in sex.

The present invention has been made in view of the above-mentioned problems, and provides a front child rider for a bicycle, which can safely and comfortably allow a child to ride on the bicycle and does not impair the operability of the bicycle. In addition, an object of the present invention is to provide a handlebar structure of a bicycle on which the front child's seat for the bicycle is suitably mounted.

In order to solve the above-mentioned problems, the following technical measures are taken for the front child-riding bicycle.
That is, the bicycle front child-riding device according to the present invention is formed on the lower surface of the seat body, which has a seat portion for seating a child facing forward and a backrest portion provided at the rear end of the seat portion. And a mounting portion that can be attached to an extended portion that is extended so as to be offset from the stem of the bicycle, a side plate that is provided on the side of the seat body so as to face up and down, and the side plate. And a headrest that is provided above the side plate and is movable in the vertical direction with respect to the side plate.

Preferably, the side plate has a first side plate and a second side plate, the first side plate is provided on the side of the seat body in a hanging shape, and is provided at the lower end of the side plate, and sits on the seat portion. A foot rest on which a child's foot can be placed; a second side plate extending upward from the upper end of the side plate; and a headrest that slidably moves up and down with respect to the second side plate. Good to do.
Preferably, the first side plate is provided on each of the left and right sides of the seat portion, from each of the left and right first side plate, the second side plate is extended upward, the headrest is to the left and right. A headrest side plate that is provided and extends vertically with respect to the second side plate; and a headrest plate that continuously extends from the headrest side plate and connects the upper ends of the headrest side plates in the left-right direction. I hope you are there.

Preferably, the headrest side plate and the headrest plate may be formed integrally with each other.
Preferably, the headrest side plate is movable in the vertical direction with respect to the second side plate, and the vertical position of the headrest is made variable by moving the headrest side plate vertically with respect to the second side plate. It should have a structure that

Preferably, the second side plate is formed with engaging teeth in the vertical direction, and the headrest side plate engages with the engaging teeth so that the upper and lower positions of the headrest can be fixed. Should be provided.
In order to solve the above problem, the handle structure of the bicycle takes the following technical means.
That is, the bicycle handlebar structure of the present invention is a bicycle handlebar structure to which the above-mentioned bicycle front child rest is attached, and a stem provided on an upper portion of a front fork that rotatably supports the front wheel of the bicycle, An extending portion that extends from the stem so as to be offset, a handle pole that extends upward from the extending portion, and a handle pole that extends in the left-right direction from the upper end portion of the handle pole so as to pass through the side of the child rider. And a handlebar extending to the seat bar, and the mounting part formed on the lower surface of the seat part is attached to the extension part so that the child rest is integrated with the stem. And

ADVANTAGE OF THE INVENTION According to the bicycle front child riding and bicycle handle structure of the present invention, a child can be safely and comfortably boarded, and the operability of the bicycle is not impaired.

It is a front perspective view showing the appearance of the front child for bicycles. It is a side view which shows the external appearance of the front child for bicycles. It is a cross-sectional side view of the front child for bicycle. It is a rear perspective view showing the appearance of the front child for bicycle. It is a perspective view which shows the aspect which pulls up a headrest upward. It is an expansion perspective view which shows the aspect which raises a headrest upward. It is sectional drawing which showed the positioning mechanism with which the headrest was equipped.

Hereinafter, a bicycle front child's seat 1 and a handle structure according to the present invention will be described in detail with reference to the drawings.
In the description, the front-rear direction is the same as the traveling direction of the bicycle, and the left-right direction and the up-down direction are the left-right direction and the up-down direction as seen by the rider of the bicycle. The front child ride 1 for a bicycle may be simply expressed as "child ride".

Further, a user who rides the front child rest 1 for a bicycle is referred to as a “child”, and a user who rides a bicycle equipped with the front child rest 1 for a bicycle is referred to as an “adult”.
As shown in FIGS. 1 to 3, the child rest 1 is arranged between the handlebars 4 of the bicycle and substantially above the stem 5 (thread stem). The bicycle can be run with a child on it.

The bicycle to which the child riding 1 according to the present embodiment is preferably used is a general bicycle except for the structure of the handle 4 (details will be described later), and the front wheel 37 and the rear wheel are bicycle frames. Each of them is rotatably attached to the front and the rear of the bicycle, and a saddle for an adult who operates the bicycle to sit on is provided substantially in the center of the bicycle frame in the front-rear direction. A pedal and a gear are provided in a frame portion located below the saddle, and a rotational driving force generated by turning the pedal is transmitted to a rear wheel by a chain or the like and becomes a propulsive force of the bicycle. There is no problem even if the bicycle has an electric assist function.

The child carrier 1 of the present invention has a seat body 10 on which a child sits. The seat body 10 has an open shape that faces forward so that a child facing forward can sit down. The seat body 10 includes a seat portion 11 on which the buttocks of a child who is seated forward is placed, and a backrest portion 12 provided so as to stand up from the rear end of the seat portion 11. A seat side wall 13 provided so as to stand upright on both left and right sides of the seat portion 11 is also provided. A cushioning material made of urethane or the like is arranged on the inner surfaces of the seat portion 11, the backrest portion 12, and the seat side wall 13 (the side facing the child).

As shown in FIG. 3, at the bottom of the seat body 10, more specifically, at the front of the bottom surface of the seat 11 and in the center in the left-right direction, the second provided on the stem 5 via the first extending portion 14A. A mounting portion 15 that can be mounted so as to be fitted from above is formed on the extension portion 14B (details will be described later).
The mounting portion 15 has an inverted concave shape with an opening at the bottom, and is fitted into the second extending portion 14B from above without a gap. By fitting the mounting portion 15 into the second extension portion 14B from above, and tightening the attachment portion 15 and the second extension portion 14B with fasteners such as bolts so that the attachment portion 15 and the second extension portion 14B are integrated, a bicycle and a child can be put on it. 1 and 1 become one.

Further, as shown in FIG. 1 and the like, the child rest 1 is provided with a first side plate 16 which is provided in a downwardly hanging manner on the side of the seat body 10. Specifically, on each of the seat side walls 13 provided on the left and right sides, a strip-shaped first side plate 16 is provided so as to extend from the outside of the seat side wall 13 while inclining downward and forward. The front-rear width of the first side plate 16 is approximately half of the front-rear length of the seat side wall 13, and the upper and lower sides of the first side plate 16 are overlapped with the first side plate 16 by about 1/3 of the upper and lower sides thereof. In addition, about 2/3 of the lower side of the vertical length of the first side plate 16 extends below the seat portion 11. The forward inclination angle of the first side plate 16 is approximately 20° forward of the vertical line.

Now, the lower end portion of the first side plate 16 is horizontally bent so as to face inward in the left-right direction, and the bent portion is a foot on which the foot of a child seated on the seat portion 11 can be placed. It is a riding section 17. Specifically, the lower end of the first side plate 16 (right side first side plate 16R) located on the right side of the seat portion 11 is horizontally bent so as to face the left side, and the right foot of the child can be placed on it. Is becoming The lower end of the first side plate 16 (the first side plate 16L on the left side) located on the left side of the seat portion 11 is horizontally bent so as to face the right side, and the left foot of the child can be placed thereon. .

In addition, as shown in FIG. 4, the right footrest portion 17R and the left footrest portion 17L are connected by a support side plate 18 extending in the horizontal direction. The support side plate 18 is attached to the lower end portion and the trailing edge of the first side plate 16, and connects the lower ends of the first side plates 16 located on the left and right sides. The support side plate 18 can increase the rigidity of the first side plate 16 and prevent inconveniences such as the lower end of the first side plate 16 wobbling. Further, since the support side plate 18 also has the function of a baffle that closes the rear end side of the footrest portion 17, the foot portion of the child moves rearward, and the foot portion comes off from the footrest portion 17. Is to prevent.

The supporting side plate 18 of the present embodiment is configured to be bent forward in a convex shape at the central portion in the left-right direction, whereby the rigidity of the supporting side plate 18 is increased and the footrest portion is also provided. The side of 17 is also wrapped.
On the other hand, the second side plate 19 is extended from the upper end of the first side plate 16 so as to extend the first side plate 16 with the same inclination as the inclination of the first side plate 16.

The front-rear width of the second side plate 19 is slightly smaller than that of the first side plate 16. In the present embodiment, the second side plate 19 is fitted from the end of the first side plate 16 into the inside thereof. Is becoming The upper end of the second side plate 19 extends to a position slightly beyond the upper end of the backrest portion 12 of the seat body 10.
The first side plate 16 and the second side plate 19 may have a structure in which members made separately are joined, or may be integrally molded. In the case of integral molding, the lower side of the side plate corresponds to the first side plate 16, and the upper side of the side plate corresponds to the second side plate 19.

Furthermore, a headrest 20 is provided on the upper end of the second side plate 19 to protect the child's head from external impact.
Specifically, the headrest 20 is composed of a headrest plate 21 that protects the occipital region of a child who sits on the seat 11, and a headrest side plate 22 that protects the temporal region of the child who sits on the seat 11 and its vicinity. .. The headrest plate 21 and the headrest side plate 22 are integrally formed so as to be continuous.

Specifically, as shown in FIG. 2 and the like, a headrest side plate having a shape in which the second side plate 19 extends upward from the upper end portion of the second side plate 19 and then curves rearward in an arc shape in a side view. 22 is provided. The headrest side plates 22 are arranged on both left and right sides of the seat 11. The lower end of the headrest side plate 22 is fitted into the upper end portion of the second side plate 19 in a jacket shape, and the headrest side plate 22 is vertically slidable relative to the second side plate 19. That is, the headrest side plate 22 is telescopically fitted into the second side plate 19 and can move up and down.

The headrest plate 21 extends in the horizontal direction from the upper end (the end facing the rear) of the headrest side plate 22. Specifically, as shown in FIG. 3, the headrest plate 21 extends from the upper end of the left headrest side plate 22 toward the right side and is connected to the upper end of the headrest side plate 22 located on the right side. The headrest plate 21 is a strip-shaped plate having substantially the same width as the headrest side plate 22, and is arranged so that the flat portion faces the front and rear.

The left and right headrest side plates 22 and the headrest plate 21 are integrally formed into a continuous strip shape to form a headrest 20, and the headrest 20 has a U-shape in a top view. Further, the inclination of the rear wall of the headrest plate 21 and the inclination of the first side plate 16 are substantially the same, and the inclination of the backrest portion 12 is also the same. In other words, the rear wall of the headrest plate 21 is located at a position where the backrest portion 12 is tilted and extended upward, and the seat body 10 having a compact and simple appearance is realized. ..

A cushioning material 23 made of urethane, styrofoam, or the like is provided on the inner surface (the side facing the child) of the U-shaped headrest 20 to enhance the effect of the headrest 20. In this way, by adopting the structure in which the headrest plate 21 is connected to the two left and right headrest side plates 22, a strong headrest 20 can be realized, and the user can feel a sense of security by wrapping around the left and right sides of the back of the head. It is possible to realize the headrest 20 capable of

The seat chair body, the first side plate 16, the second side plate 19, and the headrest 20 described above are preferably made of plastic, but there is no problem if they are made of other materials.
By the way, the above-mentioned headrest 20 can be adjusted in the vertical position according to the physique of the child and the position of the head.
More specifically, as described above, the lower end of the headrest side plate 22 is fitted into the upper end of the second side plate 19 in a jacket shape, and the headrest side plate 22 slides with respect to the second side plate 19 to change its position in the vertical direction. It is free. Therefore, by sliding the headrest side plate 22 upward with respect to the second side plate 19, the headrest plate 21 moves upward, and conversely, by sliding the headrest side plate 22 downward with respect to the second side plate 19, the headrest side plate 22 is slid downward. The plate 21 moves downward, and the headrest 20 can be arranged at an appropriate position according to the physique of the user and the position of the head.

In this embodiment, a positioning mechanism for positioning and fixing the headrest 20 with respect to the second side plate 19 is provided. The positioning mechanism has an operating lever 25 and engagement teeth 26 with which the operating lever 25 engages.
As shown in FIGS. 6 and 7, an operation lever 25 that allows the headrest 20 to slide or fixes the position of the headrest 20 is provided on the lower side surface (outer surface) of the left and right headrest side plates 22. ing.

The operation lever 25 has a plate-shaped operation piece 27 that is long in the front-rear direction, and an engagement piece 28 that extends from the upper side of the operation piece 27 so as to be substantially orthogonal. The operation piece 27 and the engagement piece 28 are integrally formed of plastic or the like, and have an L-shaped cross section in the left-right direction. By attaching to the lower side surface of the headrest side plate 22 so that the joint portion (joint side) of the operation piece 27 and the engaging piece 28 faces the front-rear direction, and by providing an axis center that penetrates the joint side and rotating the same. The operation piece 27 can be changed from being flush with the lower side surface of the headrest side plate 22 to being in a state of protruding from the lower side surface.

When the operation piece 27 is flush with the lower side surface of the headrest side plate 22, the engagement piece 28 faces the second side plate 19. On the outer surface of the second side plate 19, a plurality of engagement teeth 26 facing the front-rear direction are formed in the up-down direction, and the engagement teeth 26 have a ladder shape. When the engagement piece 28 meshes with the engagement tooth 26, the headrest side plate 22 cannot slide with respect to the second side plate 19 (fixed state). Therefore, the vertical position of the headrest 20 is fixed at this position, and the height of the headrest 20 can be adjusted.

On the contrary, when the operation piece 27 is pulled out from the lower side surface of the headrest side plate 22, the engagement piece 28 separates from the second side plate 19 and faces downward. In this state, the engagement piece 28 is disengaged from the engagement teeth 26 formed on the second side plate 19, so that the headrest side plate 22 is slidable in the vertical direction with respect to the second side plate 19. In this state, as shown in FIG. 5, for example, the headrest 20 can be pulled out upward. When pulling out, the operator stands on the rear side of the headrest 20 (rear side of the seat body 10), and from that position with an adult's right hand and left hand, an operation piece 27 of the right headrest side plate 22 and an operation piece 27 of the left headrest side plate 22. When the headrest 20 is slid and the headrest 20 is slid, the position of the headrest 20 can be easily changed.

As shown in FIG. 1 and the like, the seat body 10 and the headrest 20 described above are located behind the handlebar 4 of the bicycle to be mounted. On the other hand, in this embodiment, a luggage storage basket (loading basket 30) is attached to the front of the handle 4.
The cargo basket 30 is attached to the tip of a first extension portion 14A described later. Specifically, the attachment plate 39 is extended forward from the upper front side of the first extension portion 14A, and the rear wall 31 of the cargo basket 30 is attached to the tip of the extended attachment plate 39. There is.

The cargo basket 30 has a substantially cubic shape and has an open top surface. Luggage can be taken in and out of the cargo basket 30 through this open side (opening).
By attaching a portion of the rear wall 31 of the cargo basket 30 substantially in the left-right direction and substantially in the vertical direction to the tip of the mounting plate 39 via a fastener such as a bolt, the cargo basket 30 and the bicycle are separated from each other. Become one. The lower portion of the rear wall 31 of the cargo basket 30 is cut so as to be inclined forward, and has a structure that prevents the first basket 16 from interfering with the first side plate 16. A plurality of openings 38 are formed in the front wall 32 and the side wall 33 of the cargo basket 30, which contributes to reducing the weight of the cargo basket 30 itself and reducing wind resistance during traveling.

The child rest 1 described above can be attached to a general bicycle, but it is preferably attached to a bicycle having a handle structure described below.
The bicycle suitable for the children's seat 1 is characterized by its handle structure, and other structures may be similar to those of a normal bicycle. That is, the front wheels 37 and the rear wheels are rotatably attached to the front and rear of the bicycle frame, and a saddle for an adult who operates a bicycle to sit on is provided substantially at the center of the bicycle frame in the front-rear direction. A pedal and a gear are provided in a frame portion located below the saddle, and a rotational driving force generated by turning the pedal is transmitted to a rear wheel by a chain or the like and becomes a propulsive force of the bicycle. There is no problem even if the bicycle has an electric assist function.

On the other hand, although it is a preferable handle structure, first, a stem 5 (thread stem) which is oriented substantially upward is provided at an upper end portion of a front fork 24 which rotatably supports the front wheel 37. A first extending portion 14A extending from the stem 5 so as to face slightly forward is attached. The first extension portion 14A has a rectangular cross section and an outer shape of a rectangular parallelepiped shape, and has a shape in which the front end of the down tube 40 is extended as it is, but the present invention is not limited thereto. From the top end of the first extending portion 14A, a handle pole 34 is provided so as to face upward. The upper end of the handle pole 34 is the front opening of the seat body 10 and reaches the front of the backrest 12 in a side view.

On the base end side of the handle pole 34 and above the first extension portion 14A, a second extension portion 14B (extension portion) extending from the handle pole 34 toward the rear side is provided. ing. The second extending portion 14B has a rectangular cross section and an outer shape of a rectangular parallelepiped, and extends rearward so as to pass above the stem 5. That is, the second extending portion 14B is arranged immediately above the stem 5.

The mounting portion 15 is fitted into the second extending portion 14B from above, and both are fastened with a fastener such as a bolt so that the mounting portion 15 and the second extending portion 14B are integrated with each other. The ride 1 is integrated.
In this way, the seat portion 11 is provided on the upper side of the second extending portion 14B, in other words, the seat body 10 is positioned substantially above the stem 5, so that a child (weight of about 10 kg) is placed on the child. Even if it does, the center of gravity of the bicycle is mounted in the vicinity of the handlebar 4 of the bicycle, so that it is possible to prevent the fluttering at the beginning of rowing of the bicycle, and it is possible to prevent deterioration of the steerability during traveling as much as possible.

On the other hand, a handle bar 35 is attached so as to extend in the left-right direction from the upper end of the handle pole 34. Specifically, a handle bar 35 extends from the upper end of the handle pole 34 to the left and right, and the handle bar 35 extends outside the headrest side plate 22 to the rear side along the outer surface of the headrest side plate 22 to extend the headrest side plate 22. It is designed to end at the position where it has passed. At this end, a grip 36 made of rubber or plastic is provided in order to improve the grip of the handle 4 by an adult.

A handle bar 35 is provided at a portion extending from the upper end of the handle pole 34 in the left-right direction, with a grip 41 that can be held by a child sitting on the seat body 10 and serves as a grip portion for a child. ing. That is, the handle bar 35 acts as a grip for a child.
Further, since the horizontal portion of the handlebar 35 is arranged in front of the front opening of the seat body 10, it also has a role as a safety bar for preventing children from jumping out to the front in case of emergency. Is becoming

In this way, the seat portion 11 is provided on the upper side of the extended portion (second extended portion 14B), in other words, the seat body 10 is positioned substantially above the stem 5, so that a child (weight Even if it carries about 10 kg), its center of gravity will be mounted near the handlebar 4 of the bicycle, so that it is possible to prevent the fluttering at the beginning of rowing of the bicycle and prevent the deterioration of the steerability during traveling as much as possible. become. By disposing the second extension portion 14B and attaching the attachment portion 15 to the first extension portion 14A, the bicycle and the child rest 1 can be integrated, and substantially the same operational effects as described above can be obtained. Is possible.

As described above, by providing the front child rest 1 for bicycle of the present invention and the handle structure capable of installing the child rest 1, the child can be safely boarded even when the child is placed. In addition, it is possible to achieve the operational effect of not impairing the operability of the bicycle.
It should be considered that the embodiments disclosed this time are exemplifications in all points and not restrictive. In particular, in the embodiments disclosed this time, items that are not explicitly disclosed, such as operating conditions, various parameters, dimensions, weights, and volumes of components, do not deviate from the scope that is usually practiced by those skilled in the art. Instead, a person having ordinary skill in the art has adopted a value that can be easily assumed.

1 Bicycle front child rest 4 Handle 5 Stem 10 Seat body 11 Seat part 12 Backrest part 13 Seat side wall 14A First extension part 14B Second extension part 15 Attachment part 16 First side plate 17 Foot rest part 18 Support side plate 19th Two side plates 20 Headrest 21 Headrest plate 22 Headrest side plate 23 Cushioning material 24 Front fork 25 Operating lever 26 Engaging tooth 27 Operating piece 28 Engaging piece 30 Loading basket 31 Rear wall 32 Front wall 33 Side wall 34 Handle pole 35 Handlebar 36 Grip ( For adults)
37 front wheel 38 multiple openings 39 mounting plate 40 down tube 41 grip (for children)

Claims (7)

A seat body having a seat portion for a child facing forward and a backrest portion provided at a rear end of the seat portion;
An attachment portion that is formed on the lower surface of the seat portion and that can be attached to an extended portion that extends so as to offset from the stem of the bicycle,
A side plate provided on the side of the seat body so as to face up and down,
A headrest that is provided above the side plate and is movable in the vertical direction with respect to the side plate,
A front child for a bicycle, characterized by having. The side plate has a first side plate and a second side plate,
A first side plate provided in a hanging shape on the side of the seat body,
A foot rest that is provided at the lower end of the side plate and can put the foot of a child sitting on the seat,
A second side plate extending upward from the upper end of the side plate,
A headrest that slidably moves in the vertical direction with respect to the second side plate;
The front child for a bicycle according to claim 1, further comprising: The first side plate is provided on each of the left and right sides of the seat portion,
From each of the left and right first side plates, the second side plate is extended upward,
The headrest is a left and right headrest side plate extending in the up-down direction with respect to the second side plate, and a headrest plate continuously extending from the headrest side plate and connecting the upper end of the headrest side plate in the left-right direction. The front child resting device for a bicycle according to claim 2, characterized in that The front child seat for bicycle according to claim 3, wherein the headrest side plate and the headrest plate are formed so as to be integrated with each other. The headrest side plate is vertically movable with respect to the second side plate, and by moving the headrest side plate up and down with respect to the second side plate, the vertical position of the headrest is variable. The front child rider for a bicycle according to any one of claims 2 to 4, wherein: Engaging teeth are formed in the vertical direction on the second side plate,
The headrest side plate is provided with an engagement piece capable of fixing the upper and lower positions of the headrest by engaging with the engagement teeth. For children on the front for bicycles. A bicycle handle structure to which the bicycle front child's seat according to any one of claims 1 to 6 is attached,
A stem provided on an upper portion of a front fork that rotatably supports the front wheel of the bicycle,
An extended portion extending so as to be offset from the stem,
A handle pole extending upward from the extending portion,
A handlebar extending in the left-right direction from the upper end portion of the handlebar pole, and extending so as to pass through the side on which the child is placed;
A bicycle handle structure, wherein a mounting portion formed on a lower surface of the seat portion is attached to the extension portion, so that the child rest is integrated with the stem.