JP7282729B2 - Child seat fixing structure and bicycle with child seat - Google Patents

Description

The present invention relates to a child seat fixing structure and a bicycle with a child seat.

Conventionally, as shown in Patent Document 1 below, for example, a seat portion and a backrest portion extending upward from a rear end portion of the seat portion are provided, and the seat portion and the backrest portion are connected via bolts. Child seats are known.

Chinese Patent Application Publication No. 106985937

In this type of child seat, it is required to strongly fix the seat and backrest.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a child seat fixing structure and a child seat-equipped bicycle capable of firmly fixing a seat portion and a backrest portion without increasing the number of man-hours. aim.

In order to solve the above problems and achieve these objects, the child seat fixing structure of the present invention comprises a seat portion and a backrest portion extending upward from a rear end portion of the seat portion, A structure for fixing a child seat to be fixed to a carrier of a bicycle, wherein the seat portion has a seat plate portion whose front and back surfaces face up and down, and the backrest portion has its front and back surfaces facing up and down at the lower end portion. The lower end of the backrest portion is inserted between the lower surface of the seat plate portion and the cargo bed so that at least one of the seat plate portion and the cargo bed and the lower end portion of the backrest portion move up and down. A fixed shaft extends in the direction and fixes the seat plate portion, the lower end portion of the backrest portion, and the cargo bed.
In the child seat-equipped bicycle of the present invention, the child seat is fixed to the carrier of the bicycle by the child seat fixing structure of the present invention.

According to this invention, since the lower end of the backrest is inserted between the lower surface of the seat plate and the carrier, even if the fixing shaft is loosened, the weight of the child sitting in the child seat will cause the lower end of the backrest to move. is sandwiched and fixed by the lower surface of the seat plate and the cargo bed in the vertical direction, thereby suppressing relative displacement of the seat plate and the lower end of the backrest in the horizontal direction orthogonal to the vertical direction. can be done.
Since the lower end of the backrest is inserted between the lower surface of the seat plate and the cargo bed, when a large rearward load is applied to the backrest, the upper surface of the lower end of the backrest The load applied to the backrest portion can be distributed and received by the seat plate portion by pressing against the lower surface of the seat plate portion.
Moreover, since the fixed shaft extends vertically through at least one of the seat plate portion and the cargo bed and the lower end portion of the backrest portion, the seat plate portion, the lower end portion of the backrest portion and the cargo bed are fixed. The fixing of the seat and backrest and the fixing of the child seat to the carrier can be performed by the same fixing shaft, thereby preventing an increase in the number of parts and the number of assembly man-hours.
As described above, the seat portion and the backrest portion can be strongly fixed without increasing the number of man-hours.

A projection may be formed on either one of the lower surface of the seat plate portion and the upper surface of the lower end portion of the backrest portion and is fitted into a recess formed on the other.

In this case, a projection is formed on one of the lower surface of the seat plate and the upper surface of the lower end of the backrest and fits into the recess formed on the other. It is possible to reliably suppress horizontal relative positional displacement of the lower end portion of the backrest portion and the backrest portion.

The fixed shaft may be provided at the same position as the recess and the protrusion when viewed in the vertical direction.

In this case, since the fixing shaft is provided at the same position as the recessed portion and the protrusion when viewed from above and below, the seat portion and the backrest portion can be securely and strongly fixed.

Engagement portions that engage with each other in the vertical direction may be separately formed in the recessed portion and the protrusion.

In this case, since the recessed portion and the protrusion are separately formed with engaging portions that engage with each other in the vertical direction, it is possible to prevent the protrusion from coming off the recessed portion. The part can be fixed more securely and strongly.

The seat portion extends upward from the rear end portion of the seat plate portion and includes a waist support portion formed in a curved surface that protrudes rearward. A restricting portion may be formed that restricts upward movement of the backrest portion with respect to the waist receiving portion by abutting the formed engaged portion.

In this case, the restraint portion formed on the backrest portion abuts against the waist support portion, thereby forming a restricting portion that restricts upward movement of the backrest portion with respect to the waist support portion. The backrest can be fixed more reliably and strongly.

According to this invention, the seat portion and the backrest portion can be strongly fixed without increasing the number of man-hours.

1 is a schematic view of a child seat fixing structure and a bicycle with a child seat shown as a first embodiment according to the present invention; FIG. FIG. 2 is a vertical cross-sectional view along the front-rear direction showing the essential parts of the child seat fixing structure of FIG. 1 ; 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. FIG. 6 is a vertical cross-sectional view along the front-rear direction showing the main part of the child seat fixing structure shown as a second embodiment according to the present invention.

A fixing structure 1 for a child seat 10 and a bicycle 30a with a child seat according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG.
The child seat 10 includes a seat portion 11 and a backrest portion 12 extending upward from the rear end portion of the seat portion 11, and is fixed to a bicycle carrier 20 to constitute a bicycle 30a with a child seat.

A handlebar 23 that extends in the left-right direction and is gripped by a child seated on the child seat 10 is provided on the front portion of the seat portion 11 . The handlebar 23 is provided over the entire length of the front portion of the seat portion 11 in the left-right direction.
The seat portion 11 includes a seat plate portion 13 , a waist support portion 21 , a footrest portion 22 and a crotch split portion 28 . The seat plate portion 13, the waist support portion 21, the footrest portion 22, and the crotch split portion 28 are integrally formed.
Note that the waist receiving portion 21, the footrest portion 22, the crotch split portion 28, and the handlebar 23 may not be provided.

The seat plate portion 13 is formed in a flat plate shape whose front and back surfaces face up and down.
The waist receiving portion 21 extends upward from the rear end portion of the seat plate portion 13 and is formed into a curved surface protruding rearward. In the illustrated example, the waist receiving portion 21 extends vertically and is formed in a tubular shape with an open front, and extends upward from the outer peripheral edge of the seat plate portion 13 . The waist receiving portion 21 is provided over the entire circumference of the outer peripheral edge of the seat plate portion 13 excluding the front end portion. As shown in FIG. 2 , a restricting portion 21 a is formed at the upper end portion of the waist receiving portion 21 so as to protrude toward the outer peripheral surface of the waist receiving portion 21 . The restricting portion 21 a is formed continuously over the entire circumference of the upper end portion of the waist receiving portion 21 .

As shown in FIG. 1 , a pair of left and right footrests 22 are provided, and extend downward from the front end portions of the seat plate portion 13 and the waist support portion 21 .
The crotch part 28 protrudes forward from the center of the front end of the seat plate 13 in the left-right direction, and connects the upper ends of the pair of left and right footrests 22 . The crotch part 28 is mounted on a frame 20a of the loading platform 20, which will be described later. The crotch part 28 is fixed to the loading platform 20 by fastening members 29 . The fastening member 29 penetrates the crotch part 28 in the vertical direction and is screwed to a bridge plate 20c of the loading platform 20, which will be described later.

An abutment surface 13a facing rearward is provided on the front edge of the lower surface of the seat plate portion 13 . The abutment surface 13a extends continuously over the entire length of the lower surface of the seat plate portion 13 in the left-right direction. In the illustrated example, the abutting surface 13a is adjacent to the front edge of the lower surface of the seat plate portion 13 of the waist receiving portion 21 and is also continuously provided on the peripheral edge extending in the vertical direction. The contact surface 13a has a U shape opening upward when viewed from the front-rear direction.
The abutment surface 13 a may be provided only on the seat plate portion 13 without being provided on the waist receiving portion 21 , or may not be provided on the seat plate portion 13 .

The backrest portion 12 is bent so that the front and back surfaces of the lower end portion 14 face up and down. A lower end portion 14 of the backrest portion 12 is formed in a flat plate shape.
A lower end portion 14 of the backrest portion 12 is inserted between the lower surface of the seat plate portion 13 and the loading platform 20 . The lower end portion 14 is mounted on a frame body 20a of a loading platform 20, which will be described later. At least the front edge of the lower end portion 14 of the backrest portion 12 is in contact with or close to the abutment surface 13a of the seat plate portion 13 in the front-rear direction.

The backrest portion 12 has a bottom end portion 14 and is formed in a vertically extending tubular shape with an open front. The backrest portion 12 comprises a lower end portion 14 as well as a lower portion 24 , an upper portion 25 and a connecting portion 26 .

The lower portion 24 extends upward from the rear end portion of the lower end portion 14 and has a curved surface that protrudes rearward. In the illustrated example, the lower portion 24 extends vertically and is formed in a tubular shape with an open front, and extends upward from the outer peripheral edge of the lower end portion 14 . The lower portion 24 is provided over the entire circumference of the outer peripheral edge of the lower end portion 14 except for the front end portion. The lower portion 24 covers the entire outer peripheral surface of the waist receiving portion 21 except for the restricting portion 21a. An outer peripheral surface of the lower portion 24 is covered with a cover 27 .
The upper part 25 extends vertically and is formed in a cylindrical shape with an open front, and protrudes upward from the waist receiving part 21 .
The connecting portion 26 connects the upper end portion of the lower portion 24 and the lower end portion of the upper portion 25 over the entire circumference. The connection portion 26 has a stepped portion (locked portion) 12a facing upward. The stepped portion 12a is in contact with or close to the lower surface of the restricting portion 21a of the waist receiving portion 21. As shown in FIG. The stepped portion 12 a abuts against the lower surface of the restriction portion 21 a of the waist support portion 21 , thereby restricting upward movement of the backrest portion 12 with respect to the waist support portion 21 .

The loading platform 20 includes a frame 20a, rods 20b, and bridge plates 20c.

The frame 20a has a rectangular shape elongated in the front-rear direction when viewed in the vertical direction.
As shown in FIG. 3, the rod 20b includes a support portion 20d positioned inside the frame 20a and extending in the front-rear direction, and extending downward from both ends of the support portion 20d in the front-rear direction. and a connecting portion 20e to be connected. The support portion 20d of the rod 20b is provided at the same vertical position as the frame 20a. A plurality of rods 20b are provided at intervals in the left-right direction.
The bridging plate 20c is provided over the entire length of the frame 20a in the left-right direction. A support portion 20d for the frame 20a and the rod 20b is joined to the upper surface of the bridge plate 20c. A plurality of bridging plates 20c are provided at intervals in the front-rear direction.

A fixed shaft that penetrates at least one of the seat plate portion 13 and the loading platform 20 and the lower end portion 14 of the backrest portion 12 in the vertical direction to fix the seat plate portion 13, the lower end portion 14 of the backrest portion 12, and the loading platform 20. 15.

In the illustrated example, a plurality of fixed shafts 15 are provided at intervals in the left-right direction. A total of two fixed shafts 15 are provided one by one at the same interval from the central portion in the left-right direction. The fixed shaft 15 is a bolt that penetrates the seat plate portion 13 in the vertical direction and is screwed into a female screw portion formed on the bridge plate 20c of the cargo bed 20. As shown in FIG. The fixed shaft 15 fastens and fixes the seat plate portion 13, the lower end portion 14 of the backrest portion 12, and the cargo bed 20 in the vertical direction. The fixed shaft 15 also penetrates the bridging plate 20c in the vertical direction.

Note that the fixed shaft 15 does not have to penetrate the bridging plate 20c in the vertical direction, and may be screwed to the frame 20a, the support portion 20d of the rod 20b, or the like. The fixed shaft 15 vertically penetrates the frame 20a, the support portion 20d of the rod 20b, or the bridge plate 20c, but does not vertically penetrate the seat plate portion 13, and is formed on the lower surface of the seat plate portion 13. It may be screwed onto the internal thread. Also, the fixed shaft 15 may be fastened to a nut. Also, instead of the bolt, for example, a rivet or the like may be adopted as the fixed shaft 15 .

A protrusion 17 is formed on one of the lower surface of the seat plate portion 13 and the upper surface of the lower end portion 14 of the backrest portion 12 and is fitted into a recessed portion 16 formed on the other.
Note that the seat plate portion 13 and the lower end portion 14 of the backrest portion 12 do not have to be formed with the recessed portion 16 and the protrusion portion 17 .

In the illustrated example, a plurality of recessed portions 16 and protrusions 17 are formed at intervals in the left-right direction. A total of two recessed portions 16 and two protruding portions 17 are provided, one each with the same interval from the central portion in the left-right direction. The recessed portion 16 is formed on the upper surface of the lower end portion 14 of the backrest portion 12 , and the projecting portion 17 is formed on the lower surface of the seat plate portion 13 .
The recessed portion 16 is formed in a cylindrical shape with a bottom so that the upper surface of the lower end portion 14 of the backrest portion 12 is recessed downward and the lower surface protrudes downward. The projecting portion 17 is formed in a bottomed tubular shape so that the upper surface of the seat plate portion 13 is recessed downward and the lower surface protrudes downward. The front end portions of the peripheral walls of the recessed portion 16 and the projection portion 17 extend forward as they go upward, and the other portions extend straight in the vertical direction. Bottom walls of the recess 16 and the protrusion 17 are in contact with each other in the vertical direction.

The fixed shaft 15 is provided at the same position as the recess 16 and the projection 17 when viewed from above. Note that the fixed shaft 15 may be provided at a position apart from the recess 16 and the protrusion 17 when viewed in the vertical direction.
The fixed shaft 15 penetrates the bottom wall of each of the recessed portion 16 and the protrusion 17 in the vertical direction. A bolt head portion of the fixed shaft 15 is housed inside a bottomed tubular protrusion 17 . An insertion tube 14a protruding downward is formed on the lower surface of the lower end portion 14 of the backrest portion 12 at the periphery of the opening of the insertion hole for the fixed shaft 15 . The bottom opening edge of the insertion tube 14a is in contact with or close to the upper surface of the bridging plate 20c.

As described above, according to the child seat 10 fixing structure 1 and the child seat-equipped bicycle 30a according to the present embodiment, the lower end portion 14 of the backrest portion 12 is inserted between the lower surface of the seat plate portion 13 and the loading platform 20. Therefore, even if the fixed shaft 15 is loosened, the lower end 14 of the backrest 12 is sandwiched between the lower surface of the seat plate 13 and the carrier 20 by the weight of the child seated on the child seat 10 and fixed. As a result, it is possible to suppress relative displacement of the seat plate portion 13 and the lower end portion 14 of the backrest portion 12 in the horizontal direction orthogonal to the vertical direction.

Since the lower end portion 14 of the backrest portion 12 is inserted between the lower surface of the seat plate portion 13 and the loading platform 20, when a large rearward load is applied to the backrest portion 12, the backrest portion 12 will not move. The upper surface of the lower end portion 14 is in pressure contact with the lower surface of the seat plate portion 13, so that the load applied to the backrest portion 12 can be dispersed and received by the seat plate portion 13.例文帳に追加

Moreover, the fixed shaft 15 extends vertically through at least one of the seat plate portion 13 and the loading platform 20, and the lower end portion 14 of the backrest portion 12. Since the loading platform 20 is fixed, it is possible to fix the seat portion 11 and the backrest portion 12 and to fix the child seat 10 to the loading platform 20 with the same fixed shaft 15. An increase in man-hours can be prevented.
As described above, the seat portion 11 and the backrest portion 12 can be strongly fixed without increasing the number of man-hours.

One of the lower surface of the seat plate portion 13 and the upper surface of the lower end portion 14 of the backrest portion 12 is formed with a protrusion 17 that fits into a recessed portion 16 formed on the other. Relative horizontal displacement of the seat plate portion 13 and the lower end portion 14 of the backrest portion 12 can be reliably suppressed.

Since the fixing shaft 15 is provided at the same position as the recessed portion 16 and the protrusion 17 when viewed from above and below, the seat portion 11 and the backrest portion 12 can be securely and strongly fixed.

A stepped portion 12a formed in the backrest portion 12 abuts against the waist support portion 21, thereby forming a restricting portion 21a that restricts upward movement of the backrest portion 12 with respect to the waist support portion 21. 11 and the backrest portion 12 can be fixed more reliably and strongly.

Next, a child seat 10 fixing structure 2 and a child seat-equipped bicycle 30b according to a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the same reference numerals are assigned to the same components as in the first embodiment, the description thereof is omitted, and only the different points will be described.

In this embodiment, engaging portions 31 and 32 that engage with each other in the vertical direction are separately formed in the recessed portion 16 and the projecting portion 17 . The engaging portions 31 and 32 are formed by bending the lower end portions of the front end portions of the peripheral walls of the recess portion 16 and the projection portion 17 so as to protrude forward.

As described above, according to the child seat 10 fixing structure 2 and the child seat-equipped bicycle 30b according to the present embodiment, in addition to the same effects as those of the first embodiment, the depression 16 and the projection 17 are Since the engaging portions 31 and 32 that engage with each other in the vertical direction are separately formed, it is possible to prevent the protrusion 17 from coming off the recessed portion 16, and the seat portion 11 and the backrest portion 12 can be secured. It can be fixed more securely and strongly.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, it is possible to appropriately replace the components in the above-described embodiment with known components without departing from the scope of the present invention, and the above-described embodiments and modifications may be combined as appropriate. .

Reference Signs List 1, 2 fixing structure 10 child seat 11 seat portion 12 backrest portion 12a stepped portion (locked portion)
13 seat plate portion 14 lower end portion 15 fixed shaft 16 hollow portion 17 projection portion 20 loading platform 21 waist receiving portion 21a restricting portion 30a, 30b bicycle with child seat 31, 32 engaging portion

Claims (6)

A child seat fixing structure that includes a seat portion and a backrest portion that extends upward from a rear end portion of the seat portion, and is fixed to a carrier of a bicycle,
The seat portion includes a seat plate portion whose front and back surfaces are oriented in the vertical direction,
The backrest portion is bent so that the front and back surfaces of the lower end portion face the up-down direction,
the lower end of the backrest portion is inserted between the lower surface of the seat plate portion and the cargo bed;
a fixing shaft vertically penetrating at least one of the seat plate portion and the cargo bed, and a lower end portion of the backrest portion to fix the seat plate portion, the lower end portion of the backrest portion, and the cargo bed; fixed structure of the child seat. 2. The method according to claim 1, wherein one of the lower surface of the seat plate portion and the upper surface of the lower end portion of the backrest portion is formed with a protrusion that fits into a recess formed in the other. The fixing structure of the described child seat. 3. The child seat fixing structure according to claim 2, wherein the fixing shaft is provided at the same position as the recess and the protrusion when viewed from above and below. 4. The child seat fixing structure according to claim 2 or 3, wherein engaging portions that engage with each other in the vertical direction are separately formed in said recessed portion and said projecting portion. The seat portion includes a waist support portion extending upward from the rear end portion of the seat plate portion and formed into a curved surface that protrudes rearward,
The waist support portion is formed with a restricting portion that restricts upward movement of the backrest portion with respect to the waist support portion by abutting a locked portion formed on the backrest portion. 5. The child seat fixing structure according to any one of 1 to 4. A bicycle with a child seat, wherein the child seat is fixed to the carrier of the bicycle by the child seat fixing structure according to any one of claims 1 to 5.

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