JP6596764B2 - Zen chair - Google Patents

Description

  It is a chair that can be relaxed by simply raising the pelvis and sitting the lumbar, thoracic, cervical and head straight from the pelvis.

When the ancestors of humanity changed from walking on four legs to walking on two legs, the hips were deflected to form an S-shape to balance the center of gravity and support the body in a standing position. For this reason, if the head is not in the correct position, the muscles will become unconscious and support the head. This can lead to strain on the upper body, leading to distortions in the spine, leading to stooped back, back pain, stiff shoulders and numbness, coldness, and some visceral diseases.
In chair life, if the chair does not fit your body, you are sitting and there is no comfort ・ Sitting on the chair and changing posture frequently ・ Looseness hurts when sitting for a long time Many people say that if they were sitting on a couch that was too soft, they were sitting on the couch for some time.
I want a chair that suits my body, but I have to fit a chair on the market. As a result, I can't relax and recover from a bad posture (body).

The first problem with a chair that does not fit the body is the “height of the seat”, and the second is the “backrest shape and position”.
In the conventional posture education, only good posture was taken up. However, this is not enough and it is important to sit in the correct posture.
In order to achieve this, it is necessary to raise the pelvis comfortably and comfortably. ・ From the pelvis to the lumbar vertebrae, the thoracic vertebrae, the cervical vertebrae, and the head in a straight line.

JP-A-6-133828

Patent Document 1 discloses a method for supporting a seated person by a backrest that can stably hold a part of the seated person from the back of the buttocks to the waist when the seated person is tilted slightly rearward or rearward.

The inventor discovered an ideal way of sitting while studying the comfort of a chair for 20 years, which is a traditional Japanese Zen meditation.
The sitting style of Zazen has the effect of relaxing the mind, increasing concentration and increasing imagination.
Zazen emphasizes the flow of spiders, and the sitting method based on zazen runs through the body without stagnation of the sputum, thereby activating individual cells and increasing self-healing ability. Sometimes, you can know your physical condition and is effective in maintaining your physical condition.

Speaking of zazen, there is an image of good posture, but there are people who are struggling to improve their posture.
However, “stretching a chest” is not the same as “warping your hips”.
“Stretching” does not necessarily lead to health in the sense that it keeps the upper body tension.
On the other hand, in the zazen way of sitting, the waist is warped but the upper body is completely relaxed. Therefore, anyone can expect the effect of zazen if there is a chair that can easily reproduce the warping of zazen waist.

Zazen is used to practice Zen monks as a technique to unify the body and mind. It is necessary to solve difficult tasks while sitting for a long time, but if zazen is painful or negative to the body, you cannot sit for a long time and you cannot do the tasks.
By fully relaxing the upper body and enriching the lower body (Tanda), the streets of the wall will be improved and dialogue with your body will be possible.
Zen's heart is inherited not only in religious practice, but also in Japanese practices such as tea ceremony, flower arrangement, calligraphy, and martial arts.
It has been elucidated medically and scientifically that α waves appear during zazen in modern times.
The present invention makes it easy to comfortably raise the pelvis just by sitting, and makes a relaxed posture by allowing deep compound breathing by passing the lumbar, thoracic vertebra, cervical vertebra and head straight from the pelvis, that is, the same effect as Zen It provides a chair that can be obtained.

This chair has a well-balanced spine and skull with the sacrum upright, and sits with little energy to support the upper body, that is, the upper body part of the zazen sitting method on the chair. Designed to realize.
Specifically, it is necessary to pull the sciatica backward and push the lumbar vertebrae forward.
However, this posture cannot usually be realized unless the posture is consciously created, and the shape is quickly lost under unconsciousness. In particular, it is necessary to prevent the posture from collapsing because the ischial nodule protrudes forward.

The present invention aims to increase the comfort when taking this posture and to create a shape that adds acupressure effect. The following improvements were made to achieve this.
First of all, it is necessary to automatically guide the ischia to a good position on the seating surface (12). For that purpose, a slit (16) is provided as a center line.
Furthermore, in order to guide the lumbar in the correct position, stability of the sciatic in contact with the seat surface (12) it is important. As center sit properly the seat surface (12), it provided the correct arc as shown in FIG. 1 relative to the transverse direction of the seat surface (12).
Distortion of the spine, the balance of weight bearing collapses due habit of bag holding by Ashikumi-handedness when one foot weight and seating, because it may be caused by pelvic tilts, the seat surface arc (12) When sitting in the center, the left and right pelvis are kept horizontal, and as a result, the entire spine can be effectively distorted.

The longitudinal direction, and to avoid the pain of sciatic the time of seating, in order not slid out to the front, loose seat part in the seat surface of the sciatic immediately before a position corresponding (12) as in FIG. 2 A protrusion (20) was provided.

Secondly, about the backrest (10) support position and its effect on the body.
In the prior art, there are many configurations in which only a lumbar vertebra is pushed out in order to make an S-shaped curve of the spine and to raise the sacrum, but this method places a stress on only the third and fourth lumbar vertebrae and places a heavy burden. In order to eliminate the stress of the third and fourth lumbar vertebrae and to raise the sacrum without failure until later, it is necessary to support the sacroiliac joint and the lower end of the iliac crest as shown in FIG.
The position of the height and sacroiliac joint acetabular upper iliac crest and measured for its was performed positioning of the backrest (10) top and bottom. As a result, the sacrum can be raised without difficulty.

However, the pelvis may not be stable depending on individual differences.
[4] By providing the backrest projection (19) in the portion in contact with the iliac crest of the backrest (10) as said backrest projection (19), the seat surface portion projection (20) is whole pelvic Can be supported stably.

As the third, the shape of the backrest (10).
The backrest (10) has a shape that pushes forward while wrapping the waist with a width that does not restrict the movement of the upper body, and is configured so that the curve surrounding the waist is close to a plane and does not restrict the movement of the upper body.
By stably supporting the entire pelvis with the backrest protrusion (19) and the seating surface protrusion (20), the backrest (10) is laterally as shown in [FIG. 5], [FIG. 14] and [FIG. 15]. There is no need to make it wide.
Further, the backrest (10) was divided at the central portion to avoid direct compression to the lumbar spine, and a gap as shown in FIG. 5 was provided. Furthermore, in order to avoid direct compression on the lumbar spine, the central part was divided into two parts, and an interval was provided at the center in the left-right direction so as not to hit the spine.

Fourth, the balance of the first to third improvement items is important. Said back (10) and the positional relationship before and after the seat surface (12) can not be maintained if not appropriate correct posture (relaxation).
As a final step, this can be adjusted with the sitting comfort test device (9), which will be described later.

In order to realize the comfort of this chair and the acupressure effect, first, it was decided to measure each part of the individual body.
[Fig. 6] shows the measurement situation (measurement of basic dimensions) of each part of the body.
The measurement part is referred to as a chart of the chair so that it can be entered in the table in FIG.

Just sit down and raise your pelvis comfortably and comfortably. By passing straight through the lumbar vertebrae, thoracic vertebrae, cervical vertebra and head, you can deeply breathe and create a relaxing posture, that is, you can get the same effect as Zen Use of a chair can help maintain health.
As a result of using the chair of the present invention, the following experiences were obtained.
(1) The pelvis rises naturally and comfortably.
(2) The lumbar vertebrae, thoracic vertebrae, cervical vertebrae, and head go straight from the pelvis.
(3) Deep compound breathing and relaxing.
(4) You can confirm the location of Tanda by yourself, and you can see that the samurai is enriched.
(5) As a result, it can be recognized that the posture is correct.

Relationship between seat surface and pelvis Loose seating surface protrusion on the seating surface just before the seat bone Relationship between back support position, sacroiliac joint, and lower edge of iliac crest Stability of the entire pelvis Backrest gap Measuring situation of each part of the body (measurement of basic dimensions) Chair chart Seat protrusion and backrest dimensions Adjustment mechanism (first example) Adjustment mechanism (second example) Adjustment mechanism (third example) Composition of sitting comfort test equipment Seat depth adjustment Zen Cha complete drawing Perspective view of the backrest

First, it is necessary to lead automatically to better position the sciatic on the seat surface (12). As it provided with the seat split (16) as the center line in order. It is possible to urge the seat split (16) to sit conscious when seated in that said seat split (16).
Further, for guiding the lumbar in the correct position, the seat surface (12) an accurate arc provided in the lateral direction, by maintaining a horizontal pelvic action to adjust the distortion of the entire spine occurs.

Furthermore, over the seat surface (12) longitudinal direction throughout provided loose convex surface, provided with a peak portion of the rear one-third, and more strongly inclined to the rear portion.
Accordingly, the relief of pain caused by local pressure of the ischial tuberosities point thereon, the said seat surface (12) behind the slope coincides with the inclination angle of the pubic arch portion connecting the ischial tuberosities point and pubic nodal, A force that guides the pelvis backward and stabilizes it is generated.
As a result, the body on the seat surface (12) it is possible to prevent the slipping forward rests well skull balanced on top of the pelvis called dovetail is loosened, it is realized Zen sitting.

The longitudinal direction, provided and to avoid the pain of sciatic the time of seating, in order not slid out to the front, the loose seat portion projecting on the seat surface of the sciatic immediately before a position corresponding (12) (20) It was. As a result, the weight is applied to the greater gluteus and the biceps femoris, and can withstand long-term seating.

Of the second, the effect on said back (10) supporting position and their body, measures the height of the iliac crest of the hip top, the back portion projecting its than the height, where the drops 1 cm (19) Adjust.
If the backrest (10) supporting position is higher than the iliac crest, a burden is applied only to the lumbar spine, causing back pain. Conversely, if it is too low, it becomes difficult to pull the pelvis backward. If it is at the upper end, it may come off with a little error. 1 cm is the optimum size including error absorption.

This part is the position of the sacroiliac joint and can be said to be effective for raising the sacrum.
Conventionally, only the lumbar vertebra is pushed out to create the S-curve of the spine. However, in this method, only the third and fourth lumbar vertebrae are stressed and burdensome.
By supporting the sacroiliac joint and the lower end of the iliac crest, the pelvis could be tilted forward by raising the sacrum comfortably.
This part corresponds to the back side of Tanda, and there is an advantage that it becomes easy to have awareness of Tanda by applying pressure around this part when sitting. (Reference: "Tanda Breathing" (Shiragaku Zen Master, Hiroki Muraki)

  In addition, by having the center of pressure at this part, the gap between the diaphragm and the pelvic floor is widened, the volume of the lower abdomen is maximized, the pressure in the lower abdomen is increased, and as a result, it is easy to enter abdominal breathing. First, it helps to sit Zen from the breathing side.

The third, the is a shape of the backrest (10), backrest, to avoid direct pressure on the lumbar spine, dividing the central section, to have a distance that does not touch the spine in the lateral center This prevents direct stimulation of the lumbar spinous processes and avoids pain. The size of this gap corresponds to the periphery of the radial process and is the “one side” or “acupuncture” position in terms of body trimming, so that you will not feel pain even if the backrest pressure is high. The stimulating effect is obtained. This site is the intersection of the sympathetic nerve and the sacral parasympathetic nerve. The vertebral erection muscle in the surrounding area is used to balance the autonomic nerve by relaxing the tension.

Specifically, by placing the center point of the backrest weight between the second and third lumbar vertebrae, an acupressure effect on the renal pleasure occurs.
Said backrest (10) the upper end by setting between the 9th-10 breast vertebrae occurs acupressure effect on liver愉.
These dimensions are determined from the chair's chart (7) 2/3 lumbar vertebra height and 9/10 thoracic vertebra height.

The fourth balance of the first to third improvement items is important. Said back (10) and the positional relationship before and after the seat surface (12) can not be maintained if not appropriate correct posture (relaxation).
Said backrest (10) front end, the seat surface (12) the positional relationship between the rear of the peak, but a relationship shown in FIG. 8, the dimension "pelvis position of medical record (7) of the chair - lumbar curvature ”Can be determined.

  Finally, based on the dimensions obtained from the chart of the chair, the sitting comfort test device (9) is set according to the dimensions, and the final dimensions are determined by fine adjustment while actually sitting.

Now, a comfortable test device (9), since the comfort test device (9) is intended to be used to perform the final fine adjustment, the movable part (2) is to be able to adjust in millimeters Don't be. Since there are many adjustment points, we decided to simplify the overall view.

First, the adjustment mechanism is as simple as [FIG. 9] to [FIG. 11].
[FIG. 9] shows a hole (7) in the movable part (2), a nut (6), and a bolt (8). A handle (4) is provided at the tip of the bolt (8) through the fixing portion (1). Turning the handle (4), the movable part (2) slides in the direction indicated by the arrow. The sliding amount is represented by the scale (5).
[10], the are used when directly processing on the movable portion (2) is difficult, which was fitted with a movable section member (3) to the movable part (2), said movable section member (3) Is surrounded by the fixing portion (1). The movable part member (3) is only are passed through the holes (7) spaced the nut (6) is provided, the bolt (8) as shown in FIG. 11. The hole in this case is a through hole.
[Figure 11] is intended to push a movable object directly in the bolt (8), so as not to damage the movable object, provided the movable part (2). Although a sphere is used in the figure, it is not necessary to stick to the shape. Wherein the movable part of the stationary part (1) is [9] - [10] in the same manner as in (2), the nut (6) provided at a said hole (7) through the bolt (8) There is only. Of course, the hole in this case is also a through hole.
There are many other adjustment mechanisms, but here are three examples that can be easily done.

Shows a schematic configuration of the comfort test device in FIG. 12 (9).
The basic configuration of the comfort test device (9) includes a backrest (10), and armrests (11), a seat surface (12), and these are supported by the side plates (17) and back plate (18). FIG. 12 shows a state where the left side plate is removed.
The backrest (10) is pressed against the back by the upper backrest horizontal position adjusting handle (21) and the lower backrest horizontal position adjusting handle (22), and the vertical position is the backrest vertical position adjusting handle (23). adjust.
The amount of protrusion of the backrest protrusion (19) is adjusted by the backrest protrusion pushing handle (24).
The armrest (11) is adjusted by an armrest horizontal position adjusting handle (25) and an armrest vertical position adjusting handle (26).
The seat surface (12) is adjusted in depth by a seat surface horizontal position adjusting handle (27), and is high by a seat surface front vertical position adjusting handle (28) and a seat surface rear vertical position adjusting handle (29). And adjust the slope. The protrusion amount of the seat surface protrusion (20) is adjusted by the seat surface protrusion pushing handle (30).

It shows the seating surface depth adjustment of the comfort test device in FIG. 13 (9). The shaded area is a cross-sectional view for easy understanding of the adjustment mechanism.
Since delicate nerves, lymph, blood vessels, etc. are concentrated on the back of the knee, it is better not to press. Also, it must be shorter than the length of the upper thigh in order to pull the waist deeply. At least 2 cm should be short.
It said seat surface (12) is composed of the seat face portion protruding seat surface base portion (13) seating surface extension (14) dowel (15) (20).
Seating surface depth adjustment of the seat surface (12) is performed by exchange of the seating surface extension portion (14).
The seat surface base portion (13) and the seating surface extension portion (14) only being fitted by said dowel (15), said seating surface extension portion from the front of the comfort test device (9) ( 14) Just hold the front edge, pull it out, and insert the seat extension (14) that suits each person.

  The Zen chair completed by this invention is described in FIG.

DESCRIPTION OF SYMBOLS 1 Fixed part 2 Movable part 3 Movable part member 4 Handle 5 Scale 6 Nut 7 Hole 8 Bolt 9 Sitting comfort test device 10 Backrest 11 Seat surface 13 Seating surface basic part 14 Seating surface extension part 15 Dowel 16 Seat split 17 Side plate 18 Back plate 19 Backrest protrusion 20 Seat surface protrusion 21 Backrest upper horizontal position adjustment handle 22 Backrest lower horizontal position adjustment handle 23 Backrest vertical position adjustment handle 24 Backrest protrusion push-out handle 25 Elbow rest horizontal position adjustment handle 26 Elbow rest vertical position Adjustment handle 27 Seat surface horizontal position adjustment handle 28 Seat surface front vertical position adjustment handle 29 Seat surface rear vertical position adjustment handle 30 Seat surface protrusion handle

Claims (4)

A chair comprising a leg portion, a seat portion and a backrest (10), wherein the seat portion has a seat split (16) in the front-rear direction of the seat surface (12) and a concave arc in the lateral direction of the seat surface (12). Further, a gently convex curved surface is provided over the entire front and rear direction of the seat surface (12), a peak is provided at a portion of the rear 1/3 of the seat surface (12) , and the inclination of the rear portion is further increased. Zen chair characterized by providing a loose seat surface protrusion (20) on the seat surface at the position just before . The backrest (10) is provided with a backrest projection (19) at a position 1 cm lower than the height of the iliac crest at the upper part of the acetabulum, and the central portion of the backrest (10) is divided into two vertically, and is centered in the left-right direction. There should be an interval that does not hit the spine. The Zen chair according to claim 1, wherein: And backrest front end of the backrest (10), the positional relationship of the seat seating surface behind loose seating face projections (20), according to claim 1 or claims characterized in that it is determined by the dimensions of the sciatic position and lumbar curvature Item 3. A zen chair according to item 2. A sitting comfort test device (9) for determining the final dimensions of a Zen chair according to any one of claims 1 to 3,
The sitting comfort test device (9) includes a backrest (10), an armrest (11), a seating surface (12), a side plate (17), a backplate (18), a backrest projection (19), and a seat. It is composed of a surface protrusion (20),
A backrest upper horizontal position adjusting handle (21) and a lower backrest horizontal position adjusting handle (22) for adjusting the pressure applied to the back of the backrest (10), and a backrest vertical position adjusting handle (23) for adjusting the vertical position. When,
A back projection extruding handle (24) for adjusting a projection amount of the back projection (19);
An armrest horizontal position adjusting handle (25) for adjusting the horizontal position of the armrest (11), and an armrest vertical position adjusting handle (26) for adjusting the vertical position;
The seat surface horizontal position adjusting handle (27) for adjusting the depth of the seat surface (12), the seat surface front vertical position adjusting handle (28) for adjusting the height, and the seat surface rear vertical position adjusting handle (29). )When,
A handle (30) for extruding a seating surface protrusion for adjusting the amount of protrusion of the seating surface protrusion (20);
The seating surface (12) is formed by inserting a seating surface extension (14) suitable for each person by inserting a seating surface basic portion (13) and a seating surface extension (14) by a dowel (15). It is configured so that the surface depth can be adjusted,
A seating comfort tester that raises the pelvis comfortably and comfortably and allows fine adjustment to pass the lumbar, thoracic, cervical and head straight from the pelvis (9).