JPH0810105A - Child chair - Google Patents

Abstract

PURPOSE:To regulate the height of the seat member arranged between left and right leg frames arranged parallel to each other by simple operation. CONSTITUTION:First guide grooves 9a extending from the rear upper part to the front lower part and the almost vertical downward second grooves 9b communicating with the front lower ends of the grooves 9a are formed to the side surfaces of a pair of the left and right leg frames 2 of a chair and a plurality of paired front and rear engaging holes 10a, 10b are formed to the regions before and behind both guide grooves in an up-and-down direction at an appropriate interval. Slide members having slide blocks 14 movable along the guide grooves are fixed to both left and right sides of the square cylindrical horizontal levers 12 supporting a seat member 3. The engaging pawls 19, 19 capable of being engaged with and disengaged from the engaging holes 10a, 10b from the outer surface sides of the leg frames 2 are formed and the energizing pieces 18, 18 energizing the engaging pawls in the direction separated from the engaging holes are attached to the slide member 13 and the cam surfaces of operation cam members press the energizing pieces 18, 18 by the revolving operation of the operation cam members attached to the end parts of the operation shaft 16 inserted in the horizontal levers 12 to bring the engaging pawls 19, 19 into engagement with the engaging holes 10a, 10b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair for school children or infants (hereinafter simply referred to as "children"), and more particularly to a structure capable of adjusting the height of a seat of the chair.

[0002]

2. Description of the Related Art As a prior art of this kind of children's chair,
JP-B-63-48212 and JP-B-63-4821
There is one disclosed in Japanese Patent No. In the former configuration, a backrest is provided between the upper rear ends of a pair of left and right leg frames that are parallel to each other, and guide grooves that extend from the upper rear to the lower front are formed on the inner side surfaces of the pair of left and right leg frames. Support plates provided on both the left and right sides of the seat body are screwed and fixed to the left and right leg frames through height-adjustable screws via protrusions slidable along the guide rails.

In the latter construction, the vertical members of a pair of left and right leg frames, which are L-shaped in side view and are parallel to each other, are provided with height adjusting holes arranged in a row in the upper and lower rows to form a horizontal member of the leg frames. The front part is provided with adjustment holes arranged in a line in the front-rear direction or in a line from the rear upper part to the front lower part, while the inverted L-shaped support frame side surfaces that support the left and right sides of the seat body, The height adjustment hole and the adjustment hole are screwed and fixed so that the seat body can be adjusted in height and can be positioned forward and backward with respect to the backrest.

[0004]

However, in the former prior art, the height position of the seat can only be adjusted up and down. Therefore, if the front-back dimension from the front edge of the seat to the backrest is too large, when a person with a low sitting height and short thigh length, such as a young person, sits down, the back of the seated person becomes a backrest. The seating posture deteriorates without contact. On the contrary, if the size of the seat body from the front edge to the backrest is set shorter for the younger one, the older one has a problem that the size of the seater is insufficient and the sitting posture is deteriorated.

In the latter prior art, although the seat body is constructed so that its height can be adjusted and its longitudinal position can be adjusted with respect to the backrest, the mounting relationship of the seat body or its supporting member to the leg frame is arbitrary. There was a problem that it was too time-consuming to easily adjust as the child grew up.
An object of the present invention is to solve this problem and to provide a child chair in which the height of the seat can be easily adjusted according to the growth of the child.

[0006]

In order to achieve the above object, a child's chair according to the invention of claim 1 is such that a backrest is provided between the upper rear ends of a pair of left and right leg frames which are parallel to each other, while the leg is provided. A children's chair in which a seat body is vertically adjustable between frames, and a pair of left and right leg frames has a first guide groove extending from a rear upper side to a front lower side on a side surface of the pair of left and right leg frames. A second guide groove that communicates with the front lower end of the groove and extends substantially vertically downward is provided, and a plurality of front and rear locking holes are provided at appropriate intervals in the vertical direction at the front and rear portions of the guide grooves, while a seat is provided. Sliding bodies slidable along the first guide groove and the second guide groove on the left and right sides of the horizontal rod that supports the body, and engagements for engaging and disengaging the front and rear locking holes at each height. And means are provided.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the pair of left and right sliding bodies is relatively provided with an operating shaft that is in communication with a cylindrical horizontal rod that communicates with both left and right sides. The sliding member is rotatably inserted, and each slide member is provided with an engaging claw that can be engaged with and disengaged from the outer surface side of the leg frame with respect to the pair of front and rear locking holes so as to urge it in a direction away from the locking hole. The engaging claw is engaged with and disengaged from the locking hole by rotating the operation cam body fixed to both ends of the operation shaft.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 is a side sectional view of a child chair 1, and FIG. 2 is a plan view. The chair 1 includes a pair of left and right metal leg frames 2 and 2 arranged in parallel with each other, a seat body 3 disposed between the left and right leg frames 2 and 2, and an upper rear end of the left and right leg frames 2 and 2. A pair of front and rear caster rollers 7 and 7 are attached to the lower surface of each foot member 6 which is attached to a backrest support plate 5 to be connected and which includes a backrest 4 and extends in the front-rear direction at the lower ends of the left and right leg frames 2 and 2.

Next, a height adjusting mechanism of the seat body 3 in which a cushion material is stretched on the surface side will be described with reference to FIGS. As shown in FIGS. 1 and 3, the wide side plate 2a of each leg frame 2 has its front edge inclined from the front side of the front lower leg member 6 to the rear upper side, and from the midpoint of the height of the leg frame 2. It is formed to have a gentle slope. Also,
The rear edge of the wide side plate 2a has a shape that rises almost vertically from the foot member 6 and then extends rearward and upward in a substantially parallel manner to the front edge having a gentle inclination. Reinforcing ribs 8a and 8b are provided.

The wide side plate 2a of each leg frame 2 is provided with a first guide groove 9a extending from the rear upper side to the front lower side on the upper side thereof (the portion where the front edge and the rear edge are substantially parallel to each other). And
A second guide groove 9b, which communicates with the front lower end of the first guide groove 9a and extends substantially vertically downward, is provided at the substantially triangular portion in side view (see FIG. 1). Further, the left and right wide side plates 2a, 2a are provided with locking holes 10a, 10b of a pair of front and rear sides in a side view at a front-rear distance L1 in front and rear portions of the first guide groove 9a and the second guide groove 9b. , Are provided at the same height position in the vertical direction at a constant interval P1. Therefore, as shown in FIGS. 1 and 3, at the location of the first guide groove 9a, the locking holes 10a, 10b of the front-rear pair move from the rear upper position to the front lower position so as to move to the lower position toward the front position. It is formed stepwise, and at the location of the second guide groove 9b,
A pair of front and rear locking holes 10a and 10b are arranged in a vertical line in a vertical direction.

The seat body 3 is a front-back position adjusting means 1 which will be described later.
1 is mounted on a horizontally long rectangular pipe-shaped horizontal rod 12, and the left and right ends of the horizontal rod 12 are slidable along the first guide groove 9a and the second guide groove 9b. Sliding bodies 13, 13 and a pair of front and rear locking holes 10 at each height
An engaging means for engaging and disengaging the a and 10b is provided. As shown in FIGS. 3 to 6, each of the sliding members 13 made of synthetic resin or glass reinforced plastic mixed with short glass fibers has vertical parallel inclined pieces 14a, 14 along the upper and lower edges of the first guide groove 9a.
a and the front and rear pieces 1 along the front and rear edges of the second guide groove 9b.
4b and 14b, and the rectangular pipe-shaped horizontal rod 12 which is formed at the center of the sliding block 14
Rectangular mounting hole 15 into which the end portion of the horizontal rod 1 is inserted, and the horizontal rod 1
A shaft hole 17 for rotatably supporting a round rod-shaped operation shaft 16 inserted into the inside of the sliding shaft 2, and a pair of front and rear radii outwardly protruding from the vicinity of the front and rear pieces 14b, 14b of the sliding block 14. It is attached to the urging pieces 18, 18 and is integrally formed with engaging claws 19, 19 as engaging means for engaging with and disengaging from the front and rear locking holes 10a, 10b.

The bases of the pair of urging pieces 18, 18 are the front and rear pieces 14b, 14b of the sliding block 14 and the recessed portion 2.
2 are connected in series and at the time of molding,
The outer surfaces of the wide side plates 2a, 2a of the left and right leg frames 2, 2 are curved in a direction away from the surface of the wide side plates 2a, 2a. Also, the sliding bodies 1 on both the left and right sides
Screws 20 and 20 are attached to the operation shaft 16 on the side of 3, 13 side.
A substantially disc-shaped operation cam body 2 that can be stopped and rotated integrally
Place 1

The inner surface of each operation cam body 21 is shown in FIG.
As shown in FIGS. 5 and 7, an end surface cam portion having a height difference is formed by the rotation phase around the operation shaft 16. That is, in the operation cam body 21, the pair of urging pieces 18, 18 of the sliding body 13 are pressed from the outside toward the outer surfaces of the wide side plates 2a, 2a, so that the pair of engaging claws 19, 19 engage the locking hole 10.
Projecting end face cam portion 2 for holding the state of fitting to a and 10b
1a, 21a and the pair of biasing pieces 18, 18 by their own restoring force, the concave end cam portion which allows the free end side of the biasing pieces 18, 18 to separate from the outer surface of the wide side plates 2a, 2a. 21b, 21b and an inclined end surface cam portion 21c that smoothly connects the concave end surface cam portion 21b and the protruding end surface cam portion 21a (see FIG. 7).

Therefore, in the state shown in FIGS. 4 and 5, the protruding end surface cam portions 21a, 21a of the operation cam body 21 press the outer surfaces of the biasing pieces 18, 18 of the sliding body 13 toward the outer surface of the wide side plate 2a. The engaging claws 19 provided at the free end portion of each urging piece 18 have locking holes 10a, 10
It fits into b and is held so that it cannot be pulled out. When one operation cam body 21 is rotated 90 degrees (either clockwise or counterclockwise) from this state, the other operation cam body 21 is also rotated 90 degrees in the same direction via the operation shaft 16. The concave end surface cam portions 21b, 21b of each operation cam body 21 face the outer surfaces of the urging pieces 18, 18 as shown in FIG.
Since a vacant space as shown in FIG. 2 is created, the restoring force of the urging pieces 18 themselves causes the engaging claws 19, 1 on both urging pieces 18, 18.
9 can be held in a state of being disengaged from the locking holes 10a and 10b so as to be unlocked.

When the sliding block 14 of the sliding body 13 is slid along the first guide grooves 9a on both the left and right sides in the state where the engagement between the engaging hole and the engaging claw is released, Body 3
Moves to the lower front or the upper rear. When the engaging pawls 19 and 19 are fitted into the pair of front and rear locking holes 10a and 10b at the predetermined height position, the height of the seat body 3 is adjusted and at the same time, the depth dimension of the seat body 3 with respect to the backrest 4 is adjusted. It is possible (see FIG. 1).

That is, at the location of the first guide groove 9a, the seat body 3 is
Moves rearward and upward (downward and forward), and the seat body 3 can be adjusted in height in a substantially vertical direction at the position of the second guide groove 9b which is substantially vertical. Since the seat height is small and the length of the upper leg is short in the younger children, the child sitting in the seat 3 can be seated on the back by adjusting the height of the seat 3 at the first guide groove 9a. With the back supported by 4, the user can sit in a firm posture such that the part below the knee (lower leg) descends downward from the front edge of the seat 3.

As shown in FIGS. 1 and 8 to 10, in order to prevent the feet of the child sitting on the seat body 3 from dangling, the footrest 25 is attached to the left and right leg frames 2, 2 as shown in FIG. It is arranged between them and the height position thereof is adjustable. Therefore, vertical guide rails 26 having a U-shaped cross section are fixed to the inner surfaces of the left and right leg frames 2 and 2 in a front downward slope. On each of the vertical guide rails 26, locking holes 27 are formed in the lower piece at appropriate intervals on the left and right at appropriate height positions.

Locking metal fittings 30 are fixed to the brackets 28, 28 for supporting the left and right ends of the lower surface of the footrest base 25 with bolts 29 or the like. A guide wheel 31 that rolls on the inner surface of the vertical guide rail 26 is mounted on each of the locking fittings 30, and a locking claw 32 that engages and disengages with the locking hole 27 is provided. Further, reference numeral 33 is a stopper piece attached to the locking metal fitting 30, and when the footrest base 25 is placed in a substantially horizontal state, the stopper piece 3 comes into contact with the front surface of the vertical guide rail 26 to move to the footrest base 25. It is configured to support the downward load of. Further, when the footrest base 25 is placed in a substantially horizontal state, the locking claws 32 are fitted into the locking holes 27 in the vertical guide rails 26 and can be prevented from falling.

Therefore, in order to change the height position of the footrest base 25, when the front side of the footrest base 25 is held in the hand and pivoted upward, as shown by the chain double-dashed line in FIG. After pivoting around 31 points, the locking claw 32 is removed from the locking hole 27 of the vertical guide rail 26, then shifted to a predetermined height position, and the locking claw 32 is fitted into the locking hole 27 again. Then, the foot rest 25 should be returned horizontally.

It should be noted that when the child is in the upper grades, the footrest 25
When not using, the locking hole 27 at the lower end of the vertical guide rail 26 between the foot members 6 and 6 at the lower ends of the left and right leg frames 2 and 2.
It suffices to lower the footrest 25 so that the locking claw 32 is locked to the. In addition, for older children, the second
The seat body 3 can be vertically adjusted in height along the guide groove 9b.

Moreover, the pair of front and rear locking holes in the front and rear portions of the first guide groove and the second guide groove are engaged and disengaged by the engaging claws provided on both left and right sides of the horizontal rod for supporting the seat body. In this case, there is an effect that it is easier than the conventional work of fixing the seat body or its supporting member and the leg frame by screw fastening. The first guide groove 9a and the second guide groove 9b
To the locking holes 10a, 10b at the front and rear positions of the engaging claws 19, 19
The left and right leg frames 2 and 2 are replaced by the structure of the engaging means for engaging the
The sliding body 13 is formed so as to come into contact with the outer wide surface of each side plate 2a in each side, and the locking hole 10 is formed from the inner surface side of each side plate 2a.
The sliding member 13 may be fixed to the sliding member 13 via a and 10b by screws (not shown).
The sliding body 13 is formed so as to contact the inner wide surface of a,
The side plate 2a may be configured such that it is fastened and fixed from the outer surface side of each side plate 2a to the sliding body 13 with screws (not shown) through the locking holes 10a and 10b.

Next, FIGS. 1, 3, 5, 11, and 1
The front-back position adjusting means 11 of the seat body 3 will be described with reference to FIG. A pair of left and right longitudinal guide rails 40, 40 are fixed to the upper surface of the square pipe-shaped horizontal rod 12. At this time, the reinforcing ribs 41a that are long in the front-rear direction,
41b may be provided. Each of the guide rails 40 has an upward U-shaped cross section, and the upper and left side plates are bent inwardly to form support pieces 40a, 40a. Code 4
Reference numerals 2 and 42 denote sleds made of synthetic resin such as nylon or glass reinforced plastic (nylon or the like) mixed with glass short fibers, and are window holes formed in the center of the wide surface of the substrate 43 as shown in FIG. In 44, the base end is connected to the substrate 43,
Further, the elastic sled piece 45 extending downwardly is formed integrally. Further, brackets 46, 46 for attaching to the lower surface of the seat body 3 with screws 47 are integrally formed at the front and rear portions of the board 43.

The width of the base plate 43 is set so that the base plate 43 is in contact with the lower surfaces of the support pieces 40a, 40a on both the left and right sides from the inside of the guide rail 40 and cannot go upward. Then, the left and right support pieces 4 of each of the guide rails 40.
A brake plate 48 having a large friction coefficient, such as a rubber plate, as a movement suppressing means is stretched on the upper surfaces of 0a and 40a with an adhesive or the like. It should be noted that stoppers are provided at the front and rear ends of each of the guide rails 40 to prevent the seat body 3 from slipping forward and backward.

With this configuration, when a downward load is applied by a child sitting on the seat body 3, the elastic sled piece 45 of the sled body 42 is bent upward at its free end side, and the sled body 42 is slid upward.
Since the height of the entire body is shortened, the seat body 3 sinks toward the upper surface of the guide rail 40, and the lower surface of the seat body 3 is the surface of the brake plate 48 on the upper surfaces of the left and right support pieces 40a, 40a of the guide rail 40. Can be pressed against. As a result, when the child sits on the seat 3, the seat 3 does not move back and forth.

On the other hand, when the downward load on the seat body 3 is released, the elastic sled piece 45 itself floats up so that the contact between the lower surface of the seat body 3 and the brake plate 48 is released. The body 3 can be moved back and forth along the guide rail 40. Therefore, before sitting on the seat body 3 adjusted to an arbitrary height by the seat body height adjusting means,
By moving the seat body 3 back and forth according to the length of the upper leg of the child, the back of the child sitting on the seat body 3 can be seated so as to be in close contact with the backrest 4 and sit on the chair. Can hold the correct posture.

Even when the front of the abdomen of the child sitting on the seat 3 of the child's chair 1 placed in front of the desk (not shown) is close to the front edge of the desk top plate, he / she stands up from the chair 1. When going out, by moving the seat body 3 rearward, a large gap can be opened between the desk top plate and the seat body 3, and it becomes extremely easy to get in and out of the chair.

[0027]

In summary, according to the first aspect of the present invention, the backrest is provided between the upper rear ends of the pair of left and right leg frames that are parallel to each other, and the seat body can be vertically adjusted between the leg frames. In the children's chair mounted on the first side of the pair of left and right leg frames, a first guide groove extending from a rear upper side to a front lower side and a front lower end of the first guide groove are communicated in a substantially vertical downward direction. A second guide groove that extends is provided, and a plurality of front and rear locking holes are provided at appropriate intervals in the up and down direction in front of and behind the both guide grooves, while on the left and right sides of the horizontal rod that supports the seat body, A sliding body that is slidable along the first guide groove and the second guide groove, and an engagement means that engages and disengages with a pair of front and rear locking holes at each height are provided.

Therefore, when the child is young and the sitting height of the child is small and the length of the upper leg is short,
By adjusting the height of the slide body on the side of the seat in the first guide groove, as the seat is positioned from above the first guide groove to below the top of the desk top surface (seating surface). It is possible to increase the size of the scale, which is the height dimension, and to increase the depth of the seat from the front edge of the seat to the backrest in stages.
As the child grows up, the seating position can be adjusted very easily by adjusting the sitting posture to a good state. Then, when the child grows to a certain extent and becomes close to the physique of an adult, there is not much difference in the depth dimension of the seat body from the front edge of the seat body to the backrest, so the sliding body along the second guide groove in the substantially vertical direction. By adjusting the height of the seat body by moving up and down, it is possible to adjust the position (height) of the seat body in accordance with the growth of the child by adjusting only the above-mentioned difference size. .

According to a second aspect of the present invention, in the chair structure according to the first aspect, the pair of left and right sliding members is relatively provided with an operating shaft that is in communication with a cylindrical horizontal rod that communicates with both left and right sides. The sliding member is rotatably inserted, and each slide member is provided with an engaging claw that can be engaged with and disengaged from the outer surface side of the leg frame with respect to the pair of front and rear locking holes so as to urge it in a direction away from the locking hole. The engaging claw is engaged with and disengaged from the locking hole by rotating the operation cam body fixed to both ends of the operation shaft.

According to this structure, the operation cam bodies are fixed to both ends of the operation shaft which is inserted through the horizontal rod, and when the operation cam body rotates, the other operation cam body also rotates. To do. Therefore, the first frame on the left and right leg frames of the seat body
The front and rear pair of engaging claws provided on the sliding body movable along the guide groove or the second guide groove can be engaged and disengaged with one touch with respect to the front and rear pair of locking holes at the predetermined height position. The effect is that the height can be adjusted extremely easily.

[Brief description of drawings]

FIG. 1 is a side sectional view of a children's chair.

FIG. 2 is a plan view of a children's chair.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG.

FIG. 4 is a sectional view taken along the line IV-IV of FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an inner side view of a sliding body.

FIG. 7 is an inner side view of an operation cam body.

FIG. 8 is a plan view of a footrest.

9 is an enlarged sectional view taken along the line IX-IX of FIG.

FIG. 10 is a component perspective view of the high position adjusting means of the footrest.

FIG. 11 is a perspective view of a sled.

FIG. 12 is a plan view showing a positional relationship between a sled and a guide rail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 chair 2, 2 leg frame 2a side plate 3 seat body 4 backrest 9a first guide groove 9b second guide groove 10a, 10b locking hole 12 horizontal rod 13 sliding body 14 sliding block 16 operating shaft 18, 18 urging piece 19, 19 Engaging claw 21 Operation cam body

Claims (2)

[Claims] 1. A children's chair in which a backrest is provided between upper rear ends of a pair of left and right leg frames that are parallel to each other, and a seat body is vertically adjustable between the leg frames. On the side surface of the leg frame, a first guide groove extending from the upper rear to the lower front and a second guide groove communicating with the lower front end of the first guide groove and extending substantially vertically downward are provided. A plurality of front and rear locking holes are provided in the front-rear portion at appropriate intervals in the vertical direction, and on the left and right sides of the horizontal rod supporting the seat body along the first guide groove and the second guide groove. A children's chair comprising a slidable sliding body and engaging means for engaging with and disengaging from a pair of front and rear locking holes at each height. 2. The pair of left and right sliding bodies is rotatably inserted with an operating shaft that is in communication with a cylindrical horizontal rod that communicates with the left and right sides, and each sliding body has the front-rear pair. An engaging claw that can be engaged and disengaged from the outer surface side of the leg frame with respect to the locking hole is provided so as to urge the locking cam in a direction away from the locking hole, and is used to rotate the operation cam body fixed to both ends of the operation shaft. The child chair according to claim 1, wherein the engaging claw is configured to be disengaged from the engaging hole.