JPH0510687Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a seat chair.

[Prior art and its problems] Usually, floorboards or tatami mats (these are referred to as "floors" in this specification)
Collectively called. ), and is used in conjunction with a sitting desk, or used alone for reading, watching television, listening to music, etc., usually has a seat and a backrest.

When a person sits on such a conventional chair, they generally sit straight on the seat or sit cross-legged. However, in some cases, they may sit with their legs thrown out or stretched out in front of them, or they may sleep using a chair as a pillow. If you sleep or sit with your legs stretched out in front of the seat, there is a problem that your lower back, thighs, and areas close to them will come into direct contact with the floor, making it feel uncomfortable. There is a problem in that the cold air is transmitted directly to the lower back.

Also, this can happen even if you are sitting normally on the seat, but if you sleep or sit with your legs extended in front of the seat, the recoil will push the chair backwards, causing the user to may fall off the chair.

In this regard, as disclosed in Japanese Utility Model Application Publication No. 53-129514, the seat part is connected to a main body part connected to a backrest, and is connected to this main part and folded over the main body part. If you use the folded part with the folded part extended to the front of the main body, you can sit with your legs thrown out or stretched out in front of you, or even when you sleep using the chair as a pillow. It is comfortable to use because the waist, thighs, etc. do not touch the floor directly, and the folded part extended forward is pressed from above by the human body, and the folded part is connected to the seat main body. Therefore, the inconvenience of the user falling off the seat due to the seat shifting backwards is reduced.

However, for example, when the folded part is extended under a desk or the like and the seat is stretched out to sit, the folded part is pressed from above as described above, making it difficult to move the chair. Moreover, it is difficult to stand up from that position because a sitting table or the like gets in the way.

What can be considered is, for example,
As disclosed in Japanese Patent No. 97942, a chair is provided with wheels. If the seat chair is equipped with wheels, the folded part can be extended under a desk, etc., as mentioned above, and even if you are sitting with your legs stretched out there, you can push the floor with your feet or hands to sit. The entire chair can be moved to a position where it is easy to stand up.

However, if such wheels are simply provided in a constantly exposed state so as to be in contact with the floor at all times, for example, the folded portion may be folded over the seat body and used in a fixed position on the floor so as not to move. Even if you try to do so, due to the presence of the wheels, the chair will shift and move due to changes in the sitting person's posture, resulting in an unstable situation, and the wheels will bear most of the weight of the sitting person, causing the floor to be covered with tatami mats, carpets, etc. In this case, the wheels may dig into them and cause damage.

Therefore, when the folding portion is used by being folded over the seat main body portion, it is preferable that there are no wheels. Furthermore, even without wheels, the chair is compact, so the user can easily move it by lifting or standing up as needed.

Therefore, the present invention can be used with a part of the seat extended forward, making it easy to move the whole part, and can also be used with a part of the seat folded, in which case, To provide a chair that can be used in a stable state in a fixed position and in a state with little risk of damaging the floor.

[Means for solving problems]

In accordance with the above-mentioned object, the present invention provides a chair equipped with a seat and a backrest, in which the seat comprises an upper part and a lower part that can be stacked together, and the upper part and the lower part are different from each other. , are hinged to each other at the front end of the seat so that the lower layer can be selectively positioned either under the upper layer or in a position extending forward thereof; The lower part is designed to be covered by the lower part when the lower part is placed under the upper part, and to be exposed when the lower part is extended in front of the upper part so as to be in contact with the floor. To provide a seat chair characterized by being equipped with wheels.

The height of the backrest is preferably such that it can also serve as a pillow for a person sleeping on the seat.

In order to prevent the wheels from damaging the floor,
The peripheral surface thereof is formed to have a middle height, the outline of the middle height part in a cross section including the rotation center line is made substantially parallel to the rotation center line, and the contours on both sides of the middle height part are directed from the middle height part toward the rotation center line. It may also be a convex arc curve with a large radius of curvature.

[Effect]

According to the chair of the present invention, the upper layer and the lower layer that make up the seat can be used in a stacked state, or the lower layer can be extended forward so as to be continuous with the upper layer. You can also do it.

When used with the upper layer and lower layer stacked, the wheels are covered by the lower layer, and the lower layer is in direct contact with the floor, making it stable and difficult to move;
This will reduce the risk of damaging the floor surface.

When using the lower part with the lower part extended forward, you can stretch out a part of your body on top of it and use it comfortably.
The wheels are exposed and touch the floor, so you can change the position of the chair as needed.

[Effect of idea]

As explained above, according to the present invention, a part of the seat can be extended forward and used, and even in that case the whole part can be easily moved, and also a part of the seat can be folded and used. In some cases, it is possible to provide a chair that can be used stably in a fixed position and with less risk of damaging the floor.

The wheel has a circumferential surface with a middle height, the outline of the middle height part in a cross section including the rotation center line is substantially parallel to the rotation center line, and the contours on both sides of the middle height part are formed from the middle height part to the rotation center. When it is a convex arc curve with a large radius of curvature extending toward the line,
Because of the mid-height part that is substantially parallel to the center of rotation, it is more stable on the floor than a wheel with a completely convex mid-height part with a semicircular wheel circumferential surface, and is less likely to damage the floor.
Furthermore, compared to a simple cylindrical wheel or a wheel with only a rounded or chamfered corner that is normally provided on the corner, the dent in the floor of the tatami mat or the like caused by the wheel is gentler, making it less likely to be damaged.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The illustrated seat chair includes a seat portion 1, a backrest 2, and left and right armrests 3.

The seat part 1 consists of an upper part 11 and a lower part 12.

The upper layer 11 is a rigid core portion 11 made of synthetic resin.
1, and an upper cushion 112 that covers the surface of the core.
and a lower cushion 113 that covers the lower surface of the core. A portion of these cushions may include a reinforcing material such as a thin plate if necessary.

When viewed from the side, the core portion 111 of the upper layer is formed to have a slightly medium height, and when viewed from above, it has a slightly concave portion shaped to fit a person's buttocks. Accordingly, the upper surface of the upper cushion 112 is also concave (see FIG. 2).

The lower cushion 113 extends to below the backrest 2, which will be described later. Upper and lower cushions 112, 11
The front end portions of 3 are connected to each other so as to cover the front end of the core portion 111. The connection is made by a fastener 110 such as a chuck so that they can be connected and separated from each other. Therefore, when replacing or cleaning the upper cushion, it is only necessary to separate it.

The lower cushion 113 is bonded to the lower surface of the core 111 with a suitable adhesive, but the upper cushion 112 is simply placed over the core 111, and the rear end 112a is attached to a backrest cushion 22, which will be described later. The lower end portion 22a of the lower end portion 22a is pressed against the lower end portion 22a of the lower end portion 22a to prevent it from coming off.

The lower layer 12 of the seat 1 is a cushion, which may contain appropriate reinforcing material as required.

The cushion 12 is stacked under the upper cushion 113, and the front end 12a of the cushion 12 is stacked under the upper cushion 113.
It is hinged to the front end 113a of 13 with cloth. The rear end 12c of the cushion 12 is separably connected to the rear end 113c of the cushion 113 by a fastener 120 such as a so-called (registered product) Velcro fastener. Therefore, the cushion 12 can be used by being extended in front of the upper layer 11 in a continuous manner as shown in phantom lines in FIG.

Two pairs of wheels 4 are mounted on the core 111 of the upper seat portion 11.
is attached so that it can rotate freely. The wheels do not appear when the lower seat part 12 is stacked under the upper part 11, but come into contact with the floor when the lower part 12 is extended in front of the upper part 11. Upper lower cushion 11
3 and the lower part 12 has a space 11 into which the wheel fits.
3b and 12b are provided.

As shown in FIG. 3, each wheel 4 has a circumferential surface formed with a medium height, and an outline B of the medium height portion in a cross section including the rotation center line A is substantially parallel to the rotation center line. , the contour C on both sides of the mid-height portion is a convex arc curve with a large radius of curvature extending from the mid-height portion toward the center line of rotation.

Since the wheel shape is like this, the center height part is substantially parallel to the center of rotation, so it is more stable on the floor than a wheel whose circumferential surface is simply a semicircular, fully convex center height part. It is less likely to damage the floor surface, and
Compared to the case where the wheel shape is simply short cylindrical, or when the corners are provided with rounded or chamfered portions that are normally provided, when the wheels are run on tatami mats, for example, the dents in the tatami mats are It does not become an acute angle state a as shown in the figure, but an arc b as shown in Fig. 3.
The tatami mats are less likely to be damaged because they are recessed in a manner that resembles a . Moreover, the wheels 4 in this embodiment tend to curve and travel easily.

The backrest 2 consists of a rigid core part 21 made of the same synthetic resin as the core part of the seat part, and a cushion 22 that covers the front surface from the top surface of the core part.

The seat core 11 and the backrest core 21 are integrally formed.

A portion 211 of the core portion 21 corresponding to the buttocks of a person sitting on the seat is recessed rearward to match the shape of the buttocks, and a top portion 212 corresponds to the lumbar region (4th and 5th lumbar vertebrae) of the person sitting on the seat. (It is desirable that the Therefore, the cushion 22 also has a shape that generally matches this.
The cushion top 221 is curved in the shape of a hook, is hooked onto the core top 212, and is separably connected to the core top 212 by a fastener 222 such as a chuck. The cushion lower end 22a and the upper cushion rear end 112a of the seat are pressed into contact with the core 21. Therefore, cushion 22
can be removed from the core portion 21 when cleaning or the like is necessary.

Further, when viewed from above, the core portion 21 is formed into a hollow shape as a whole so as to fit comfortably on the back (see FIG. 2).

Each armrest 3 includes an armrest portion in which a support arm 32 extends from an elbow rest cushion 31, and the arm is bifurcated in the middle, and at each end of the bifurcation there is a support rod 33 extending perpendicularly to the arm 32. is installed protrudingly. Each support rod 33 has a hole 2 on the side of the backrest core.
10 is removably inserted.

In the state shown by the solid line in FIG. 1, the armrest 3 is in its original armrest position. In this way, pull out each of the armrests 3 in the armrest position from the backrest 2, switch the left and right sides of the armrests, place them facing the back of the backrest 2, and insert the support rod 33 of each armrest 3 into the hole 210 on the side of the backrest. can. This condition is shown in phantom in FIG. This armrest position is the main reading position, and an appropriate head support 23 is placed on both armrests 3.
You can read a book in a prone position by handing it to someone. In this case, the shoulders of the reader P are supported by the backrest top 221, the forehead is supported by the head support 23, and the book B is placed below between the armrests 3.

Backrest top 2 for comfortable reading
The height from the floor when in use is approximately 25 to 40 cm. This height is also convenient for the top of the backrest 2 to push the lumbar region of the sitter forward and stretch the back muscles when the illustrated seat chair is used as the original seat chair. be. This height is also convenient for sleeping with the lower seat portion 12 extended forward and using the backrest top portion 221 as a pillow. In the illustrated example, it is assumed that the lower seat part 12 is extended forward and read in a prone position, and the height H from the floor position, that is, the lower surface of the seat upper part 11 to the backrest top part 221, is designed to be approximately 31 cm. has been done. In addition, the head support 23
The top surface 30 of the armrest 3 in the position where the
It is desirable that it be located at a slightly higher position than 21, and the illustrated example is approximately 1 to 2 cm higher.

The dimensions of the main parts of the illustrated seat are as follows.

Height or thickness T of seat upper layer 11: approximately 11 cm, Height or thickness t of the lower seat portion 12: approximately 4 cm.

The height or thickness of the entire seat (T+t) is approximately 15cm.
It is also at a height that makes it easy to perform the so-called frog sitting, where you sit on the seat with both legs outside the seat 1.

The armrest 3' shown in FIG. 5 is attached to the backrest 2 in the same manner as the armrest 3, but the armrest cushion 31' is rotatably supported by the support arm 32', and the main reading position is When the cushion 31' is placed on the screen, the cushion 31' can be rotated to support the forehead of the reader P.

According to the illustrated seat chair, the user can sit on the armrest 3 at the original armrest position and use it as a seat chair in the conventional manner. In this case, the front protruding portion 220 of the top 221 of the backrest 2 hits the lower back of the seater, stretching the back muscles of the seater. When the weight of the sitter moves forward while using the chair, the cushion portion is mainly compressed at the front of the seat 1, and as a result, the seat 1 is tilted forward. Since the core is an integrally formed rigid body, the backrest 2
The top 221 of the seat also moves forward and continues to touch the lower back of the seater. Therefore, even if the seater's weight shifts forward a little, it is difficult to maintain an upright posture.

Further, as described above, the seater can easily put his/her legs out of the seat 1 and perform the so-called frog sitting.

When the upper layer part 11 and the lower layer part 12 of the seat part 1 are used in a stacked state, the wheels 4 are covered by the lower layer part,
The lower part is in direct contact with the floor surface, and is in a stable state where it does not easily move and is less likely to damage the floor surface.

When you want to stretch your legs forward, you can extend the lower part 12 of the seat 1 forward. This way, you won't touch the hard floor, and the coldness of the floor won't be transmitted directly to your lower back, so you can sit comfortably. I can stay with you. Furthermore, if the lower part 12 of the seat part 1 is extended forward, the seated person will shift forward and their weight will move forward, and the reaction will push the upper part 11 of the seat part and the backrest 2 backward. Even if the seats are a bit awkward, they are connected to the seat lower part 12 that extends forward, and the lower part 12 is held down by a part of the user's body, so they will not slip back. do not have.

In addition, when you extend your legs forward like this and your legs are tucked under a desk, etc., the wheels 4 provided on the seat are in contact with the floor.
When getting up from a chair, the user can push the floor, desk, etc. with his/her hands and feet to move the chair to a position where it is easy to stand up.

Furthermore, as already mentioned, the lower seat part 12 can be extended forward and the backrest can be used as a pillow to sleep on while watching TV, or the armrest can be placed in the reading position to provide support when reading in a prone position. can do. When the lower seat part 12 is extended and used when sleeping, watching TV, or reading, the lower seat part 12 is also pressed down by a part of the user's body, so the The seat upper part 11 and the backrest 2 will not slip off to the rear.

When sleeping with the backrest as a pillow or reading in a prone position, it is convenient to use a cushion K as shown in phantom lines in FIG. This cushion K
It is preferable that a portion of the backrest 2 fit into a recess corresponding to the buttocks of the backrest 2.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, where Figure 1 is an overall side view, Figure 2 is an overall plan view, and Figure 3 is an explanation of the wheels in the embodiment shown in Figure 1. FIG. 4 is an explanatory diagram of another example of the wheel, and FIG.
The figure is a plan view of the main parts of another example of the armrest. DESCRIPTION OF SYMBOLS 1... Seat part, 11... Upper layer part, 111... Core part, 112... Upper cushion, 113... Lower cushion, 12... Cushion (lower layer part), 2
... Backrest, 21 ... Core, 210 ... Hole, 22
...Cushion, 221...Top of backrest, 23...
...Head support, 3,3'...Armrest, 31,3
1'...Elbow cushion, 32, 32'...Support arm, 33...Support rod, 4...Wheel.

Claims (1)

[Claims for Utility Model Registration] (1) A chair equipped with a seat and a backrest, wherein the seat is composed of an upper part and a lower part that can be stacked together, and the upper part and the The lower layer is hinged to each other at the front end of the seat so that the lower layer can be selectively placed either in a position under the upper layer or in a position extending forward thereof. and the upper layer has a seat so that it is covered by the lower layer when the lower layer is laid under the upper layer, and is exposed and comes into contact with the floor when the lower layer is extended in front of the upper layer. A seat chair characterized by being provided with wheels for running the chair. (2) The chair according to claim 1, wherein the height of the backrest is set to a height that allows the backrest to double as a pillow for a person sleeping on the seat. (3) The circumferential surface of the wheel is formed with a middle height, and the contour of the middle height part in a cross section including the rotation center line is substantially parallel to the rotation center line,
3. The seat chair according to claim 1 or 2, wherein the contours of both sides of the mid-height portion are convex circular curves with a large radius of curvature extending from the mid-height portion toward the rotation center line.