JP2999372B2 - Children's chair - Google Patents

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 a chair.

[0002]

2. Description of the Related Art As prior art of this kind of child chair,
JP-B-63-48212 and JP-B-63-4821.
No. 3 discloses a technique disclosed in Japanese Patent Laid-Open Publication No. Hei. In the former configuration, a backrest is provided between the upper rear ends of a pair of left and right leg frames parallel to each other, and a guide groove extending from the upper rear to the lower front is formed on the inner surface of the pair of left and right leg frames, Support plates provided on both left and right sides of the seat are screwed and fixed to the left and right leg frames via protrusions slidable along the guide rails so that the height positions thereof can be adjusted.

In the latter configuration, height adjustment holes are vertically formed in a line in a vertical direction in a pair of left and right leg frames which are parallel to each other in an L shape in a side view, and height adjustment holes are vertically arranged in a line. On the part from the front part, while adjusting holes are arranged in a line from front to rear or from rear upper to lower front, a reverse L-shaped support frame side supporting 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 back and forth with respect to the backrest.

[0004]

However, in the former prior art, the height position of the seat body can only be adjusted up and down. Therefore, if the front-to-rear dimension from the front edge of the seat to the backrest is too large, when a person such as a child, who has a low sitting height and a short thigh, sits on the backrest, The sitting posture becomes worse without contact. On the other hand, if the dimension from the front edge of the seat to the backrest is set short for the young, the elderly have the problem that the seat is insufficient in size and the sitting posture is also poor.

In the latter prior art, the seat is adjustable in height and adjustable in the front-rear position with respect to the backrest. However, the mounting relationship of the seat or its supporting member to the leg frame is arbitrary. Because it is too long, there is a problem that it takes time to adjust easily according to the growth of the child.
An object of the present invention is to solve this problem and to provide a children's chair in which the height of the seat can be easily adjusted according to the growth of the child.

[0006]

According to a first aspect of the present invention, a backrest is provided between the upper rear ends of a pair of left and right leg frames, while the backrest is provided. A children's chair comprising a seat body mounted between frames so as to be vertically adjustable, a first guide groove extending from a rear upper part to a front lower part on side surfaces of the pair of left and right leg frames, A second guide groove communicating with the front lower end of the groove and extending substantially vertically downward; and a plurality of a pair of front and rear locking holes provided at appropriate intervals in the vertical direction at positions before and after the both guide grooves. A sliding body slidable along the first guide groove and the second guide groove on both left and right sides of the horizontal rod supporting the body, and engagement engaging and disengaging with a pair of front and rear locking holes at each height. Means.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, an operation shaft communicated with the pair of left and right sliding bodies in a tubular horizontal rod communicating with both left and right sides. Rotatingly inserted, each sliding body is provided with an engaging claw that can be disengaged from the outer surface side of the leg frame with respect to the front and rear pair of locking holes in a direction away from the locking hole, The engaging claw is disengaged from the engaging hole by a rotating operation of the operating cam body fixed to both ends of the operating 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 has a pair of left and right metal leg frames 2 and 2 arranged in parallel with each other, a seat body 3 arranged 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 castor rollers 7, 7 are attached to the lower surface of each foot member 6 extending in the front-rear direction at the lower ends of the right and left leg frames 2, 2 and attached to the backrest support plate 5 to be connected.

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

On the wide side plate 2a of each leg frame 2, a first guide groove 9a extending from the rear upper part to the front lower part is formed on the upper side (a part where the front edge and the rear edge are substantially parallel). And
A second guide groove 9b, which extends substantially vertically downward and communicates with the front lower end of the first guide groove 9a, is formed in the substantially triangular portion in a side view (see FIG. 1). The left and right wide side plates 2a, 2a are provided with a pair of substantially rectangular locking holes 10a, 10b in a front-rear direction at a front-rear distance L1 at a front-rear distance from the first guide groove 9a and the second guide groove 9b. , At the same height 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 front and rear locking holes 10a and 10b are moved from the rear upper position to the front lower position such that the front and rear locking holes 10a and 10b become the front position as they go down. It is formed stepwise, and at the location of the second guide groove 9b,
A pair of front and rear locking holes 10a, 10b are arranged in a substantially vertical cascade.

The seat 3 is provided with a front / rear position adjusting means 1 to be described later.
1 is mounted on a horizontal rod 12 in the shape of a horizontally long rectangular pipe having a left and right side. The left and right ends of the horizontal rod 12 can slide along the first guide groove 9a and the second guide groove 9b. A pair of front and rear locking holes 10 at each height
a and 10b are provided with engaging means for engaging and disengaging. 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 fiber has vertically inclined parallel pieces 14a, 14 along the upper and lower edges of the first guide groove 9a.
a, the front and rear pieces 1 along the front and rear edges of the second guide groove 9b
4b and 14b, and the square pipe-shaped horizontal rod 12
A rectangular mounting hole 15 into which the end of the horizontal rod 1 is inserted.
A shaft hole 17 for rotatably supporting a round bar-shaped operation shaft 16 inserted into the inside 2, and a pair of radially outwardly projecting front and rear from near the front and rear pieces 14 b of the sliding block 14. It is attached to the urging pieces 18 and 18 and is integrally formed so as to have engaging claws 19 and 19 as engaging means adapted to be engaged with and disengaged from the pair of engaging holes 10a and 10b.

The bases of the pair of biasing pieces 18, 18 have front and rear pieces 14 b, 14 b of the sliding block 14 and the concave strip 2.
2, and at the time of the molding,
The outer sides of the wide side plates 2a, 2a of the left and right leg frames 2, 2 are curved away from the surfaces of the wide side plates 2a, 2a. In addition, the sliding body 1 on both the left and right sides
On the side of the operating shaft 16, screws 20 and 20 are provided.
A substantially disk-shaped operation cam body 2 which can be stopped and integrally rotated
1 is arranged.

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

Therefore, in the state shown in FIGS. 4 and 5, the protruding end cam portions 21a of the operation cam body 21 press the outer surfaces of the biasing pieces 18, 18 of the sliding body 13 in the direction of the outer surface of the wide side plate 2a. The engaging claws 19 provided on the free end portion of each biasing piece 18 are provided with locking holes 10a, 10
b and is held undetachably. 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, and between them, FIG.
Is formed, the restoring force of the biasing piece 18 itself causes the engagement claws 19, 1 of the biasing pieces 18, 18 to engage.
Reference numeral 9 can hold a state of being released from the locking holes 10a and 10b so as to be released.

If 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 locking hole and the engaging claw are unlocked, the seat is Body 3
Moves forward and backward or upward and backward. When the engaging claws 19, 19 are fitted into the front and rear engagement holes 10a, 10b at the predetermined height, the height of the seat 3 is adjusted and the depth of the seat 3 with respect to the backrest 4 is adjusted simultaneously. (See FIG. 1).

That is, at the location of the first guide groove 9a, the seat 3
Moves rearward and upward (frontward and downward), and the height of the seat body 3 can be adjusted in a substantially vertical direction at the substantially vertical second guide groove 9b. In younger children, the sitting height is small and the length of the upper thigh is short. Therefore, if the height of the sitting body 3 is adjusted at the location of the first guide groove 9a, the child sitting on the sitting body 3 will have a backrest. In a state where the back is supported by the back 4, the part below the knee (the lower leg) can be seated in a precise posture such that the lower part descends from the front edge of the seat body 3.

As shown in FIGS. 1 and 8 to 10, in order to prevent the feet of the child sitting on the seat 3 from hanging in the air, a footrest 25 is attached to the left and right leg frames 2, 2. It is arranged between them and the height position thereof is adjustable. Therefore, vertical guide rails 26, 26 having a U-shaped cross section or the like are fixed to the inner surface sides of the left and right leg frames 2, 2 so as to be inclined forward and downward. In each of the vertical guide rails 26, locking holes 27 are formed in lower portions thereof at appropriate intervals at right and left positions.

An engaging bracket 30 is fixed to brackets 28, 28 for supporting the left and right side edges of the lower surface of the footrest 25 with bolts 29 or the like. Each of the locking fittings 30 is provided with a rolling guide wheel 31 on the inner surface of the vertical guide rail 26 and provided with a locking claw 32 which is engaged with and disengaged from the locking hole 27. Reference numeral 33 denotes a stopper piece to be attached to the locking bracket 30, and when the footrest 25 is set to a substantially horizontal state, the stopper piece 3 comes into contact with the front surface of the vertical guide rail 26 and moves to the footrest 25. It is configured to support a downward load. Further, when the footrest 25 is set to a substantially horizontal state, the locking claw 32 is fitted into the locking hole 27 in the vertical guide rail 26 to prevent the footrest 25 from falling.

Therefore, in order to change the height position of the footrest 25, the front side of the footrest 25 is rotated upward while holding the front side of the footrest 25, as shown by the two-dot chain line in FIG. After rotating about the 31 places to remove the locking claw 32 from the locking hole 27 of the vertical guide rail 26, the locking claw 32 is shifted to a predetermined height position so that the locking claw 32 is fitted into the locking hole 27 again. Then, the footrest 25 may be returned to the horizontal state.

When the child is in a higher grade, the footrest 25
Is not used, the locking hole 27 at the lower end of the vertical guide rail 26 between the foot members 6, 6 at the lower ends of the left and right leg frames 2, 2.
The footrest 25 may be lowered so that the locking claw 32 is locked. Also, for older students, the second
The height of the seat body 3 can be adjusted vertically along the guide groove 9b.

In addition, the first and second guide grooves are engaged and disengaged from a pair of front and rear locking holes at front and rear portions by engagement claws provided on both left and right sides of a horizontal rod supporting the seat body. In this case, there is an effect that the operation of fixing the seat body or its supporting member to the leg frame by the conventional screw fastening can be simplified. The first guide groove 9a and the second guide groove 9b
The engaging claws 19, 19
Of the left and right leg frames 2 and 2
The sliding body 13 is formed so as to abut on the outer wide surface of each side plate 2a, and the locking hole 10 is formed from the inner side of each side plate 2a.
a and 10b may be configured to be fastened and fixed to the sliding body 13 by screws (not shown).
a sliding body 13 is formed so as to contact the inner wide surface of a.
The outer surface of each side plate 2a may be configured to be fixedly fastened to the sliding body 13 by screws (not shown) via the locking holes 10a and 10b.

Next, FIG. 1, FIG. 3, FIG. 5, FIG.
2, the front / rear position adjusting means 11 of the seat 3 will be described. 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, which are elongated in the front-rear direction,
41b is preferably provided. Each of the guide rails 40 has an upward U-shaped cross section, and the upper portions of the left and right side plates are bent inward to form support pieces 40a, 40a. Code 4
Reference numerals 2 and 42 denote sled bodies made of synthetic resin such as nylon or glass reinforced plastic (nylon or the like) mixed with short glass fiber, and a window hole 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,
In addition, the elastic sled piece 45 extending downward and convex is integrally formed. Brackets 46, 46 for attaching to the lower surface of the seat body 3 with screws 47 are integrally formed at front and rear portions of the substrate 43.

The width of the substrate 43 is set such that the substrate 43 comes into contact with the lower surfaces of the support pieces 40a, 40a on the left and right sides from the inside of the guide rail 40 and cannot be moved upward. 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, is stretched on the upper surfaces of the reference numerals 0a and 40a with an adhesive or the like. Note that stoppers are provided at the front and rear ends of the guide rails 40 to prevent the seat body 3 from slipping back and forth.

With this configuration, when a downward load is applied, such as when the child sits on the sitting body 3, the elastic sled piece 45 of the sled body 42 has its free end curved upward and the sled body 42 is bent upward.
Since the overall height is reduced, the seat 3 sinks toward the upper surface of the guide rail 40, and the lower surface of the seat 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. Pressed against. As a result, when the child is sitting 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 lifts 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 3 adjusted to an arbitrary height by the seat height adjusting means,
By moving the seat body 3 back and forth according to the length of the child's upper thigh, the back of the child sitting on the seat body 3 can be seated so as to abut against the backrest 4, and can sit on a chair. Posture can be properly maintained.

Further, even if the front of the abdomen of the child sitting on the seat 3 of the child's chair 1 placed in front of a desk (not shown) is close to the front edge of the desk top, the child stands up from the chair 1. When going out, by moving the seat body 3 backward, the gap between the desk top plate and the seat body 3 can be greatly opened, and it is extremely easy to get in and out of the chair.

[0027]

In summary, according to the first aspect of the present invention, a backrest is provided between the upper rear ends of a pair of left and right leg frames parallel to each other, and a vertical position of a seat body can be adjusted between the leg frames. A first guide groove extending from the upper rear to the lower front and communicating with the lower front end of the first guide groove to be substantially vertically downward on the side surfaces of the pair of left and right leg frames. An extended second guide groove is provided, and a plurality of a pair of front and rear locking holes are provided at appropriate intervals in the up-down direction at positions before and after the both guide grooves, while on the left and right sides of the horizontal rod supporting the seat body, A sliding member slidable along the first guide groove and the second guide groove, and an engaging means for engaging and disengaging a pair of front and rear locking holes at the respective heights are provided.

Therefore, when the child is a young person, the child's sitting height is small, and the length of the upper thigh is short,
If the height of the sliding body on the side of the seat body is adjusted in the first guide groove, as the seat body is positioned from above the first guide groove to below, the distance from the upper surface of the desk top plate to the upper surface of the seat body (seating surface) is increased. It is possible to increase the height dimension, which is the scale size, and to gradually increase the seat body depth dimension from the seat body front edge to the backrest,
As the child grows up, the seating position can be adjusted very easily by closely fitting the sitting posture to a good state. When the child grows to some extent and approaches the physique of an adult, there is no significant difference in the depth of the seat from the front edge of the seat to the backrest. Therefore, the sliding body extends along the substantially vertical second guide groove. Is moved up and down to adjust only the height of the seat, so that only the adjustment of the scale size can be performed to easily adjust the position (height) of the seat according to the growth of the child. .

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

According to this structure, the operation cams are fixed to both ends of the operation shaft inserted through the horizontal rod, and the rotation of one of the operation cams simultaneously rotates the other operation cam. I do. Therefore, the first frame in the left and right leg frames of the seat body
The front-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 the front-rear pair of locking holes at a predetermined height. This has the effect that the height adjustment can be extremely easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a child chair.

FIG. 2 is a plan view of the child chair.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

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

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

FIG. 8 is a plan view of a footrest.

FIG. 9 is an enlarged sectional view taken on line IX-IX of FIG. 8;

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

FIG. 11 is a perspective view of a sled body.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chair 2, 2 Leg frame 2a Side plate 3 Seat 4 Backrest 9a 1st guide groove 9b 2nd 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 operating cam body

Claims (2)

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