JPH11348859A - Child auxiliary seat for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the comfortableness of a child auxiliary seat for a bicycle, increase its safety, facilitate its manufacture, and miniaturize it at the time of packaging it without its opening/closing part being opened by the vibration of the bicycle when it is used for a basket, and protect the child auxiliary seat from rain, dust, and dirt. SOLUTION: A seat member B provided with a seat part 4, a backrest 5, a front part 6, side parts 7, and an opening/closing part 8 and formed out of sail cloth is attached to a framework body which a back frame 2 involving a side surrounding frame and backrest frame 2b is derrickingly-assembled on a front frame 1 involving a seat frame 1a and a front surrounding frame so as to form a space 3 between the front surrounding frame and the side surrounding frame. The front end of the opening/closing part is attached to the vertical type mounting part 2 of the side surrounding frame so as to serve as a basket, and detached so as to be foldable toward the inside of the front part when a child sits on the seat. A storage part is formed at the seat member and provided with a water and dust proof cover to cover the child auxiliary seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle child seat that can be attached to a bicycle carrier and used as an auxiliary seat for carrying a child or as a luggage basket, and a waterproof and dustproof cover that can cover the child auxiliary seat. The present invention relates to a bicycle child seat provided with a waterproof dustproof cover on a child seat mounted on the front of a bicycle for carrying a child.

[0002]

2. Description of the Related Art As conventional bicycle child seats, those described in Japanese Utility Model Publication No. 58-3317 and Japanese Utility Model Publication No. 7-2381 have been proposed. The left and right side frames form a framework of the child assistant seat main body, in which a net plate is stretched on the framework or a wire is stretched in a lattice shape. It is configured to open and close by rotating the open / close frame. In addition, there is no one provided with a waterproof and dustproof cover for preventing the bicycle auxiliary seat from rain and dust, and it has been left uncovered as it is, or simply covered with a sheet or the like to prevent rain and dust.

[0003]

Therefore, a child assist seat for a bicycle as in the above-mentioned conventional example is a hard mesh board or a metal wire and holds the body of the child, so that the riding comfort is poor. There was a problem. And, when the mesh plate or wire is stretched on the frame, the mesh plate or wire must be welded to the frame, and the sharp edge of the mesh plate or the tip of the wire is not exposed. To be coated with a synthetic resin. However, there has been a risk that the coating may become worn and unsightly due to long-term use, or the edge of the sharp net plate or the tip of the wire rod may be exposed and injured. In addition, when a net is stretched on a frame or a wire is stretched in a lattice shape, the holding portion composed of the backrest frame and the side frame cannot be raised and lowered to make the frame compact.
There was also a problem that the packaging became large and space was required for transportation and storage. In addition, since the open / close frame is pivoted at both sides, the bicycle can be used as an auxiliary seat for carrying children or as a baggage, so when riding on a rough road surface or a place with steps, the bicycle must be up and down. Vibrates and the open / close frame pivots upward due to vibration,
For this reason, the opening part closed by the opening / closing frame may be opened, and the prevention of the falling of the articles put in the packing basket is not perfect.

[0004] Further, the bicycle child assist seat mounted and fixed on the carrier or the child assistant seat attached to the front part of the bicycle is not provided with a waterproof and dustproof cover for covering them. There is also a problem that the garbage may be exposed to rust and may not be long-lasting, or it may become dusty and contaminate the clothes and the goods to be put into the basket of the child sitting in the child auxiliary seat.

In view of the above-mentioned problems, the present invention provides a structure in which a sheet member such as a waterproof cloth, a canvas or a vinyl cloth is attached to a frame body instead of a net plate or a wire, thereby improving ride comfort and being easy to manufacture. In addition, the opening and closing of the space is made so that the opening and closing part of the seat member can be attached to and detached from the attachment part of the frame so that the space is not opened by the vertical vibration of the bicycle, and the back frame of the frame is replaced with the front frame On the other hand, it is provided to be able to be undulated, so that it can be made compact during packaging, transportation and storage. In addition, a waterproof and dustproof cover is provided so that it can be stored in the seat member, which covers the child assistant seat when not in use to prevent rain and dust, and when used as a luggage, removes items in the luggage from rain and dust. It is intended to prevent. Furthermore, the child assistant seat attached to the front of the bicycle is also provided with a waterproof and dustproof cover to prevent the child assistant seat from rain and dust.

[0006]

According to a first aspect of the present invention, there is provided a bicycle pediatric assistant which is mounted on a bicycle carrier and is also used as a luggage basket. A front frame 1 having a front frame 1b having an upper portion as a handle 9, a rear frame 2 having a side frame 2a also serving as an armrest and a backrest frame 2b, and a front frame 1b and a rear surface of the front frame 1. A frame A is assembled between the side frame 2a of the frame 2 and the side frame 2a with the space 3 therebetween, and the frame A is provided with the seat frame 1a, the backrest frame 2b, and the front frame 1b.
Waterproof cloth, canvas or vinyl provided with a seat portion 4, a backrest portion 5, a front portion 6, a side surface portion 7, and an opening / closing portion 8 for opening and closing the space portion 3, which are adapted to the side surrounding frame 2a and the space portion 3, respectively. The gist is that a sheet member B made of cloth is attached.

The child assisting bicycle seat according to the first aspect of the present invention having the above-described structure, a back frame 2 is assembled to a front frame 1 to form a frame A, and a separately prepared seat portion 4, backrest portion 5, front surface. By attaching the seat member B having the portion 6, the side portion 7 and the opening / closing portion 8 to the frame A, the seat portion 4 is provided on the seat frame 1a, the backrest portion 5 is provided on the backrest frame 2b, and the front portion is provided on the front surrounding frame 1b. 6, and a side surface portion 7 is attached to the side surface surrounding frame 2a, and an opening / closing portion 8 for opening and closing the space portion 3 is provided, so that an auxiliary seat main body is configured. As a result, the manufacturing process is simplified, and the seat member holds the child's body. When used as an auxiliary child seat for carrying a child, the opening / closing portion 8 of the seat member B is used.
Is opened and the child's feet are hung down from the space portion 3 to be seated. When used as a cargo basket, the opening and closing portion 8 is closed.

According to a second aspect of the present invention, there is provided a bicycle auxiliary seat for a bicycle, comprising: a fixing means for fixing the frame A of the first aspect on a rear carrier of the bicycle; C with a foot mounting portion for mounting C
Frame 1a on which the seat portion 4 can be attached and mounted, and the seat frame 1
The front frame 1 is formed by integrally bending a front surrounding frame 1b which is provided with a handle 9 at the upper part and has a handle 9 at an upper part thereof and can mount the front part 6 of the sheet member B, and the side part 7 of the sheet member B is mounted. A side frame 2a having a horizontal mounting portion 2c, a vertical mounting portion 2d to which the tip of an opening / closing portion 8 of the seat member B for opening and closing the space portion 3 can be attached and detached, and the seat member B connected to the seat portion 4 The backrest frame 2b for mounting and supporting the backrest portion 5 is composed of the back frame 2 which is integrally bent.

The bicycle auxiliary seat according to the second aspect of the present invention having the above structure is fixed on a rear carrier of the bicycle,
Further, the frame A to which the footrest member C is attached is attached to the front frame 1.
Since the front frame 1 is formed by integrally bending the seat frame 1a and the front surrounding frame 1b, the handle 9 does not need to be separately manufactured and attached to the front surrounding frame 1b. The back frame 2 includes a side surrounding frame 2a having a horizontal mounting portion 2c and a vertical mounting portion 2d, and a backrest frame 2.
Since b is also formed integrally and bent, there is no need to separately provide each mounting portion, and the production is greatly simplified. When used as an auxiliary seat for carrying a child or as a luggage, a seat member B that opens and closes the space 3 is used.
The opening / closing portion 8 can be formed by attaching and detaching the tip to the vertical mounting portion 2d of the side surface frame 2a.

The gist of the present invention for solving the above-mentioned problems is that the rear frame 2 can be raised and lowered with respect to the front frame 1.

In the child assisting bicycle seat according to the third aspect of the present invention having the above structure, the rear frame 2 can fall down to the position where the rear frame 2 covers the front surrounding frame 1b by falling down forward. Therefore, the child seat for a bicycle can be made compact during packaging, transportation and storage.

According to a fourth aspect of the present invention, there is provided a bicycle auxiliary seat according to the present invention, wherein when the opening / closing section 8 of the seat member B is used as a basket, the leading end of the opening / closing section is formed in a vertical shape of a side surrounding frame. In the case of attaching to a mounting portion and carrying a child, the gist is that the front end portion of the opening / closing portion is detached from the vertical mounting portion 2d of the side surrounding frame 2a so as to be foldable on the inner surface side of the front portion 6.

The bicycle child assist seat according to the fourth aspect of the present invention, when used as an auxiliary seat for carrying a child, can be compactly folded on the inner side of the front surrounding frame 1b, so that it is an obstacle. When the bicycle is used as a cargo basket, the ends of the left and right opening / closing portions 8 can be attached and fixed to the vertical mounting portion 2d of the side surrounding frame 2a, so that the opening / closing portion 8 opens even if the bicycle vibrates up and down. There is no possibility that the article falls from the space 3.

According to a fifth aspect of the present invention, there is provided a bicycle assistant seat for a bicycle according to a fifth aspect of the present invention, wherein supporting rods 10 and 11 are provided at two upper and lower stages of the front frame 1 and are connected to the seat portion 4 of the seat member B. The front part 6 is bent upward along the lower support rod 11, the upper end of the front part 6 is attached to the upper support rod 10, and the attachment piece 12 is provided on the lower surface of the seat part 4, and the seat member B is seated. The gist is to fix to the frame 1a.

In the bicycle child assisting seat according to the fifth aspect of the present invention having the above structure, the front portion 6 of the seat member B can be bent under the lower supporting rod 11 along the lower supporting rod 11 so as to be simple. Enclosure part is wide by the structure and front enclosure 1b
The front part 6 of the sheet member B can be attached to the second member. Further, since the front end of the front portion 6 is attached to the upper support rod 11, a space is formed below the handle 9 so that the handle can be easily gripped. In addition, the seat portion 4 of the seat member B is securely attached to the seat frame 1a by the attachment piece 12. Can be fixed.

According to a sixth aspect of the present invention, there is provided a bicycle assistant seat for a bicycle according to the present invention.
The gist of the present invention is that the storage unit 13 is provided with a waterproof and dustproof cover D that covers the child assist seat also serving as a luggage basket.

According to the child assisting bicycle seat of the present invention having the above-described structure, the storage member 13 is provided in the seat member B, and the waterproof and dustproof cover D is stored in the storage portion 13, so that it is not used. Occasionally put on the child auxiliary seat that also serves as a luggage, or when putting items in the luggage, put on the luggage so that the items put in the child auxiliary seat or the luggage do not get wet in the rain and receive dust. Not even.

According to a seventh aspect of the present invention, there is provided a pediatric assisting seat for a bicycle, wherein the seat portion 4, the backrest portion 5, and the side portion 7 of the pediatric assisting seat attached to the front portion of the bicycle are provided with a waterproof cloth, a canvas or a cloth. The gist of the present invention is that a sheet member B made of a vinyl cloth is provided with a storage portion 13 provided in the sheet member B, and the storage portion 13 is provided with a waterproof and dustproof cover D for covering a child assistance seat.

The bicycle child assist seat of the present invention having the above structure is adapted to be applicable to a child assistant seat mounted on the front part of a bicycle, and a waterproof portion provided in the seat member B is provided. Since the dust-proof cover D is stored, the child auxiliary seat can be covered when not in use.
The auxiliary seat can be protected from rain and dust.

According to an eighth aspect of the present invention, there is provided a bicycle auxiliary seat according to the present invention, wherein the backrest portion 5 of the seat member B is provided with a bag-shaped storage portion 13 which can be opened and closed by a fastener 14.
The gist is that one end of the waterproof / dustproof cover D is attached to the inside of the storage section so that the cover D can be taken in and out of the storage section 13.

In the child assisting bicycle seat according to the eighth aspect of the present invention, when a child is carried, the waterproof and dustproof cover D is provided in the bag-shaped storage portion 13 provided on the backrest portion 5 of the seat member B. Is folded and stored, and when not in use, the zipper 14 of the storage section is opened and the waterproof dustproof cover is pulled out to cover the child auxiliary seat in order to protect the bicycle auxiliary seat from rain and dust. Since one end of the waterproof / dustproof cover D is mounted in the storage portion, the cover is not blown off or lost.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the structure and operation of the present invention described above, an example of a preferred embodiment of a bicycle pediatric assistant seat according to the present invention will be described below in detail with reference to the drawings. explain.

FIGS. 1 to 8 show an example of a bicycle auxiliary seat which is also used as a basket.
a is a seat frame, 1b is a front surrounding frame, and a single round bar is formed in a wide U-shape, and is bent at a right angle at a position corresponding to the front end of the seat frame 1a to form a seat frame 1a and a front surface. An outer frame of the surrounding frame 1b is formed, and fixing plates 15 and 16 for fixing on a rear carrier of the bicycle orthogonally to the round bar material of the outer frame parallel to the seat frame 1a at a predetermined interval. They are fixed in parallel. The upper part of the U-shaped outer frame of the front surrounding frame 1b is a handle 9, and support rods 10 and 11 are provided in two upper and lower stages between the round bars of the two outer frames. A handshake 9 a is attached to the handle 9. Fixed plate 1 of seat frame 1a
Both ends of 5 and 16 are bent downward, and through-holes for attaching the footrest member C are formed in the bent portions.
6 are provided with a through hole for pivotally attaching the rear frame 2 to the front freely and a stopper 17 for restricting the rear frame 2 from rotating rearward. Further, the fixing plate 1
The seat frame 1a is sandwiched by the mounting plates 23 and 24 pressed from below the bicycle carrier 5 and 16 and the bicycle carrier.
Can be fixed, and at the same time, the mounting piece 12 can be mounted by the fixing plate 16 and the mounting plate 24. In addition, 18
Is an auxiliary plate for reinforcement attached to the rear end of the seat frame 1a.

Reference numeral 2 denotes a back frame composed of a side frame 2a also serving as an armrest and a backrest frame 2b. The lower ends of both sides are pivotally attached to both ends of the fixing plate 16 of the seat frame 1a, and the side frame 2a is fixed. Vertical mounting portion 2d standing from both sides of plate 16
And a horizontal mounting part 2 having an upper part formed in a semicircular shape.
The backrest frame 2b is integrally formed by bending obliquely upward from the horizontal mounting portion 2c of the side surrounding frame 2a. Then, the vertical mounting portion 2d of the rear frame 2
The front end of the opening / closing section 8 of the sheet member B for opening and closing the space 3 can be detached, and the sheet member B is attached to the horizontal mounting section 2c.
Side part 6 of the seat member B on the backrest frame 2b.
Is mounted and supported. The rear frame 2 is assembled with the front frame 1 with a space portion 3 therebetween, and forms a frame A mainly composed of an auxiliary seat.

B is a seat member made of canvas, and includes a seat frame 1a, a backrest frame 2b, a front surrounding frame 1b, and a side surrounding frame 2
The opening and closing portion 8 for opening and closing the seat portion 4, the backrest portion, the front portion 6, the side surface portion 7, and the space portion 3, each having a size and shape suitable for the seat member B, are connected to the a and the space portion 3. A mounting piece 12 is provided on the lower surface of the seat 4. The seat member B is formed by combining two canvases, and the seat portion 4 and the backrest portion 5 are provided with a cushioning material 20 between the two canvases to improve sitting comfort. Reference numeral 19 denotes a seat belt which is laterally attached to substantially the center of the backrest portion 5 and the side portion 7 of the seat member B.

The seat member B is mounted on the frame A by mounting the seat portion 4 on the seat frame 1a, fixing the seat portion 4 to the seat frame 1a with mounting pieces 12 provided on the lower surface of the seat portion 4, and connecting the seat portion 4 to the front end of the seat portion 4. The lower part of the lower support rod 11 of the two upper and lower support rods 10 and 11 provided on the front frame 2 is bent upward along the outside of the support rod 11 to form the upper support rod. The upper end of the front part 6 is bent at 10 so that it can be fixed by a magic tape attached to the inner surface of the upper end. Further, the side surface portion 6 attached to the lower surface of the rear half of the seat portion of the seat member B has both sides bent along the inside of the side surface surrounding frame 2a and fixed to a horizontal attachment portion 2c.

Reference numeral C denotes a footrest member on which a child's foot is placed. Two thin round bars are arranged on a wide U-shaped frame 21 and the lower end is bent outward, and the child's foot is placed on this member. It has become. A rectangular protective cover 22 having both sides bent outward is fixed to the wide U-shaped frame 21. The footrest member C is attached to the bent portions at both ends of two fixed plates 15 and 16 fixed to the seat frame 1a, and extends downward from both side spaces 3 mainly composed of the auxiliary seat.

In FIG. 5, reference numeral 8 denotes an opening / closing portion for opening and closing the opening on both sides, which is continuously provided so as to be attached to the front surface portion 6. When a child is to be placed, the opening / closing portion is formed by covering the outer frame of the front surrounding frame 1b. One is folded so as to wrap it, and the other is superimposed on it, so that it can be folded on the inner surface side of the front part 6 and stopped with Velcro. The portion 8 can be freely attached to and detached from the vertical mounting portion 2d of the frame A by bending the distal end portion of the opening / closing portion 8 and using a magic tape provided inside the distal end portion.

Next, in FIGS. 4 and 6 to 8, D is a rectangular waterproof / dustproof cover made of a synthetic resin such as a vinyl cloth which covers the child auxiliary seat also serving as a luggage, and 13 is the cover. The lower half of the backrest portion 5 of the sheet member B can be opened and closed by a fastener 14 in a bag-shaped storage portion for storing the sheet. When the waterproof dustproof cover D is left outdoors or the like without using the child auxiliary seat, or when it is used as a luggage and the articles are put in the luggage, the fastener 14 is opened to open the waterproof dustproof cover from the storage portion 13. D is pulled out to cover the auxiliary seat main body as shown in FIG. 7 to prevent rain and dust, and when the waterproof / dustproof cover D is not used, it is folded and stored in the storage portion 13. In addition, one end of the waterproof / dustproof cover is attached to the vicinity of the inner entrance of the storage unit 13, so that when the waterproof / dustproof cover D is taken out and used, the auxiliary seat main body can be easily covered, and the cover D is blown off by wind. , Is not lost.

FIG. 9 is a perspective view showing a state in which a waterproof and dustproof cover D is put on a child assist seat attached to the front part of the bicycle. The seat part 4, the backrest part 5 and the side part 7 of the child assist seat are covered with canvas. A storage part 13 is provided in a sheet member B made from the above, so that the waterproof and dustproof cover D can be put in and taken out of the storage part 13.
It is installed near the internal entrance of.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and can be implemented in various forms without departing from the gist of the present invention. Of course.

[0032]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first aspect of the present invention, there is provided a bicycle auxiliary seat according to a first aspect of the present invention, wherein a front frame having a seat frame mounted and fixed on a carrier, a front frame and a side frame and a backrest frame also serving as armrests. A frame having a space between the front surrounding frame of the front frame and the side surrounding frame of the rear frame, and the seat frame, the backrest frame, the front surrounding frame, and the side surface. Attach a seat member made of waterproof cloth or canvas, which has a seat and backrest of suitable size and a front and rear side, and an opening and closing part for opening and closing the space, to the enclosure and the space. Therefore, when a child sits down, the body is embraced by the seat member made of waterproof cloth, canvas or vinyl cloth, the sitting comfort is very good, and the emphasis is on placing the child,
There is no image of putting a child on a basket as in the past. In addition, since a mesh plate is not stretched or a wire is not stretched over the skeleton body as in the related art, the cutout of the mesh plate or the wire is not exposed, and it is extremely safe in use and handling. Further, since the skeleton and the sheet member can be manufactured separately, the manufacture is also facilitated.

According to a second aspect of the present invention, there is provided a bicycle auxiliary seat according to the present invention, wherein the front frame and the rear frame of the frame are formed by bending a single round bar material, and the front frame includes a seat frame and a handle. The front frame has a horizontal frame, a rear frame has a horizontal mounting portion, a side frame having a vertical mounting portion, and a backrest frame. The handle and each mounting portion are separately manufactured and mounted. It is not necessary and can be easily manufactured.

According to the third aspect of the present invention, the bicycle auxiliary seat can be downsized forward because the rear frame on which the seat member is mounted can be folded forward, and can be compactly packed, transported and stored. It is very convenient. still,
If the footrest member is removed from the fixing plate and placed in the child assistant seat, it can be made more compact.

According to the fourth aspect of the present invention, when a child is carried on the bicycle, the opening / closing portion can be folded into the inner side of the front portion, so that the opening / closing portion does not become an obstacle and can be used as a basket. In this case, the space can be closed by attaching the end of the opening / closing part to the vertical mounting part of the side frame, so that the space can be opened due to the vertical vibration of the bicycle on a rough road surface or a place with a step. There is no danger of the items in the basket dropping.

According to the fifth aspect of the present invention, since the front part of the bicycle auxiliary seat is bent along the support rod 11, the storage part can be widened and the front part of the seat member can be attached to the front surrounding frame. . Also, the front portion of the sheet member can be attached to the front surrounding frame with a space below the handle. Further, the seat can be securely mounted on the seat frame by the mounting pieces.

According to the sixth aspect of the present invention, since the child assist seat for a bicycle is provided with a waterproof and dustproof cover capable of covering the child assist seat also serving as a luggage in the storage portion of the seat member, the child assist seat is used. If not, this cover can be used to prevent rain and dust, improve the durability of the bicycle auxiliary seat, and prevent dust to contaminate children's clothes and items to be put in the basket. Absent. In addition, if a waterproof / dustproof cover is used when used as a cargo basket, the articles can be protected from rain and dust, and the articles are not easily stolen. Furthermore, when the waterproof / dustproof cover is not used, the waterproof / dustproof cover can be folded and stored in the storage portion, so that the waterproof / dustproof cover becomes a cushion material, and the cover is not lost, which is convenient.

According to the seventh aspect of the present invention, the child assist seat for a bicycle is provided with a storage portion and a waterproof and dustproof cover in a seat member of the child assist seat attached to the front portion of the bicycle. By covering, the child auxiliary seat can be protected from rain and dust.

According to the eighth aspect of the present invention, there is provided a bicycle auxiliary seat in which a bag-shaped storage portion which can be opened and closed by a fastener is provided in a lower half portion of a seat back portion, and one end of a waterproof and dustproof cover is provided in the storage portion. Since the cover is attached, the waterproof and dustproof cover is not lost, and the waterproof and dustproof cover is not blown off by wind or the like when used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a frame of a bicycle child assist seat of the present invention.

FIG. 2 is a perspective view of a bicycle child assist seat according to the present invention when a child is placed thereon.

FIG. 3 is a partially cutaway perspective view of a bicycle child assist seat according to the present invention when used as a luggage basket.

FIG. 4 is a side view of the bicycle child assist seat of the present invention.

FIG. 5 is a perspective view showing a main part of an opening / closing section of the bicycle child assist seat of the present invention.

FIG. 6 is an enlarged sectional view of an auxiliary seat portion of the bicycle child assist seat of the present invention.

FIG. 7 is a perspective view showing a state in which an auxiliary seat portion of the bicycle auxiliary seat of the present invention is covered with a waterproof and dustproof cover.

FIG. 8 is a rear view of an auxiliary seat portion of the bicycle child assist seat of the present invention.

FIG. 9 is a perspective view showing a state in which the bicycle auxiliary seat attached to the front part of the present invention is covered with a waterproof and dustproof cover.

[Explanation of symbols]

 A: Frame B: Sheet member C: Footrest member D: Waterproof and dustproof cover 1: Front frame 1a: Seat frame 1b: Front frame 2 ... Back frame 2a: Side frame 2b ... Back frame 2c: Horizontal Mounting part (armrest part) 2d Vertical mounting part 3 Space part 4 Seat part 5 Backrest part 6 Front part 7 Side wall part 8 Opening / closing part 9 Handle 10, 11 Support rod 12 Mounting Piece 13 ... storage section 14 ... fastener

Claims (8)

[Claims] The present invention relates to a bicycle child assist device which is mounted on a bicycle carrier and is also used as a cargo basket. A front frame having a seat frame and a front frame having an upper portion as a handle, a side frame also serving as an armrest. A back frame having a backrest frame, a skeleton body assembled with a space between the front surrounding frame of the front frame and the side surrounding frame of the rear frame is formed. Waterproof cloth, canvas or vinyl cloth provided with a backrest frame, a front enclosure, a side enclosure, and a seat, a backrest, a front part, a side part, and an opening / closing part that opens and closes the space, which are adapted to the space, respectively. A child assist seat for a bicycle, wherein the seat member B is attached. 2. The frame according to claim 1, further comprising: fixing means for mounting and fixing the bicycle on a rear carrier of the bicycle, and a foot mounting portion for mounting a foot mounting member, wherein the seat portion of the seat member is mounted. A front frame in which a seat frame that can be placed, a front surrounding frame to which the front end of the seat frame is raised upright and a handle is provided at the upper portion and a front portion of the seat member can be attached, and a side portion of the seat member are attached. A side surrounding frame having a horizontal mounting portion and a vertical mounting portion to which a front end of an opening / closing portion of a seat member for opening / closing a space portion can be attached / detached, and a backrest portion of the seat member connected to the seat portion are supported. 2. The child assisting seat for a bicycle according to claim 1, wherein the backrest frame and the back frame are integrally bent. 3. The bicycle child assist seat according to claim 1, wherein a rear frame can be raised and lowered with respect to the front frame. 4. The opening / closing portion of the sheet member is attached to a vertical mounting portion of a side surrounding frame when the opening / closing portion is used as a cargo basket, and the front end portion of the opening / closing portion is laterally surrounded when a child is placed. 3. The bicycle child assist seat according to claim 1, wherein the bicycle auxiliary seat is detachable from the vertical mounting portion of the frame and is foldable on the inner surface side of the front portion. 5. A support rod is provided at two upper and lower stages of the front frame,
The front part connected to the seat part of the seat member is bent upward along the lower support rod, and the upper end of the front part is attached to the upper support rod, and a mounting piece is provided on the lower surface of the seat part to seat the seat member. 3. The bicycle auxiliary seat according to claim 1, wherein the bicycle auxiliary seat is fixed to a frame. 6. The bicycle child seat according to claim 1, wherein a storage part is provided in the seat member, and the storage part is provided with a waterproof dust-proof cover for covering the child auxiliary seat also serving as a luggage basket. . 7. A child assist seat to be attached to a front portion of a bicycle, wherein a seat portion, a backrest portion and a side portion of the seat are formed of a sheet member made of waterproof cloth, canvas or vinyl cloth, and a storage portion is provided in the seat member. A bicycle child seat comprising a waterproof and dustproof cover for covering the child seat in the storage portion. 8. A backrest part of the seat member is provided with a bag-shaped storage part which can be opened and closed by a fastener, and one end of a waterproof and dustproof cover is mounted in the storage part so that the cover can be taken in and out of the storage part. The child assist seat for a bicycle according to claim 6 or 7, wherein: