JP2004105676A - Rotary backrest by load distribution method by elastic body and fulcrum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary backrest most suitable for relaxation by improving a structure in an apparatus for a backrest for pushing and supporting the back by sitting down on a chair. <P>SOLUTION: A fulcrum 31 is arranged for reducing a load of a muscle when a person sits down on the chair, and is formed as the structure for balancing a load applied to a first projecting part 23 and a second projecting part 28. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a backrest device for use as a backrest of a chair or an attachment of the backrest of a chair, and for supporting the back.
[0002]
[Prior art]
In general, the chair is intended to relax and rest by relaxing the muscles by leaning on the backrest.
However, sitting in an unnatural shape for a long time without adhering only the lumbar portion to the backrest adversely affects health.
Therefore, as shown in FIGS. 1 and 2, the present applicant firstly supports the upper part 5 of the back of the person 4 and the lower part 6 of the back of the person 4 in order to simultaneously support the upper part 5 of the back. 1 and the second convex portion 2 supporting the lower part 6 of the back are provided separately, and an angle adjusting mechanism 3 is provided between the first convex portion 1 and the second convex portion 2. We have proposed "furniture for sitting" in which the relative angle between the first protrusion 1 and the second protrusion 2 can be adjusted. (Japanese Patent No. 63-153428)
By using the proposed seat furniture, the spine can be extended and the abdomen and chest can be opened forward without any strain on the muscles.
In addition, it has been confirmed that such posture and relaxation of muscles have a good effect on the relaxation and concentration of the brain and mental activity, as well as on the autonomic nerves and organs.
In the case shown in FIG. 3, when the knee is bent due to back pain and the legs are placed on the desk, the posture of sitting in a chair balances the body, and the back may be rounded. This is a "back and waist support for stool furniture" which has been proposed as a device that can handle various cases.
When the first convex portion 15 and the second convex portion 16 rotate around the shafts 13 and 14, respectively, and are pushed forward by the first arm 10, the second arm 11, the spring 17, and the spring 18, The structure is such that it can cope with the case where the upper part 5 of the back is separated from the back of the chair.
The angle adjusting mechanism 12 has a structure used when the difference in distance between the backrest of the chair and the upper part 5 of the back cannot be adjusted only by the expansion and contraction of the springs 17 and 18.
[0003]
[Problems to be solved by the invention]
The conventional technique shown in FIGS. 1 and 3, "furniture for stool" and "support for back and waist in furniture for stool" can be used to relax muscles of the upper body and maintain correct posture. It is excellent as a device that can satisfy the requirements for relaxing and relieving stress, such as promoting the balance between left and right muscles with the center of the spine as the main body, and being aware of the center.
However, an object of the present invention is to provide a more convenient device and to obtain deeper relaxation, and specifically, to solve the following two problems.
The prior art devices shown in FIGS. 1 and 3 are disadvantageous in that they have an angle adjusting mechanism 3 and an angle adjusting mechanism 12 and therefore have a large shape and can be applied only to a chair having a wide seat portion.
The first problem is to improve this drawback without impairing the good functions of the conventional technology, and to provide a compact and portable device that can be widely applied to a general-purpose chair.
A second problem is to provide a device that has a better feeling of use than devices of the prior art and that provides deeper relaxation.
[0004]
[Means for Solving the Problems]
The first problem is that the angle of adjustment that needs to be performed using the angle adjusting mechanism 3 and the angle adjusting mechanism 12 is not large and is about 30 degrees in actual use. 12 is removed, and a fulcrum 31 having a circumferential surface that is easy to roll on the outer periphery is provided at the central portion of the base 7 instead of the relative angle change of the first convex portion 15 and the second convex portion 16 and the angle adjusting mechanism 12. By focusing on the fact that the inclination of the base 7 can be changed by rolling the fulcrum 31 without impairing the function of the conventional device, a compact and high-performance backrest device is provided.
Further, when the base 7 is made of a rubber material, it also has a rear cushion function and an angle adjusting function of the springs 17 and 18, and has an effect of changing the material.
Also, when the person 4 sits down on the chair and leans on the backrest of the chair, leaning on the upper body, and supporting it at one point, comparing the case where the upper part 5 of the back is supported and the case where the lower part 6 of the back is supported is supported. Although it is necessary to support the lower back 6 with the same torque, a large force is required even if the torque is the same. However, the first convex portion 15 and the second convex portion 16 are also adapted to the state of the natural load of the muscle required for maintaining the posture of the human body. We focused on the fact that removing the muscle load corresponding to the supported and supported force by muscle relaxation leads to higher muscle relaxation and relaxation by preventing muscle load from occurring elsewhere.
Therefore, it is necessary to provide a mechanism that balances the force between the first convex portion 15 that supports the upper back 5 by pushing and the second convex portion 16 that supports the lower back 6 by pushing. This problem has been solved by forming a rotating force above and below the fulcrum 31 by providing the spring 31 and providing a rubber plate 47, a spring 54 and a spring 55.
When the seat is tilted by the angle adjusting mechanism 3 or the angle adjusting mechanism 12, since the center of rotation is fixed at one point, there is a relative displacement with the movement of the body, but the fulcrum 31 is provided. In the case of adjusting the inclination angle by rolling, the center of the shaft is moved instead of rotating the center of the shaft, so that the center moves and the movement becomes closer to natural body movement.
In addition, since the contact point moves, the position of the fulcrum that generates the vertical rotational force also moves. Therefore, the balance between the force pressing the upper part 5 of the back and the force pressing the lower part 6 of the back can be easily provided by providing the fulcrum 31. Became.
This will be described with reference to FIG.
When the force of the first protrusion 23 supporting the upper part 5 of the back and the force of the second protrusion 28 supporting the lower part 6 of the back are naturally balanced on the arm 30, when the force is applied to the second protrusion 28, the arm Reference numeral 30 indicates that the contact point between the tilt fulcrum 31 and the backrest of the chair is close to the second convex portion 28, and has a function of reducing the rotational force per pushing force from the second convex portion 28 side to work toward balance. .
The position of the fulcrum for balancing the force of the first convex portion 23 supporting the upper portion 5 and the second convex portion 28 supporting the lower portion 6 of the back varies depending on the position of the back and the body shape of the individual. However, with fixed ones, there was a problem with the position of the fulcrum. This is solved by providing the fulcrum 31.
The rubber plate 47, the springs 54, and the springs 55 are arranged vertically and connected by a base 49, so that they interfere with each other to achieve a balance.
Sufficient muscle relaxation was necessary to communicate from the muscular system to the brain and obtain deeper relaxation.However, balancing the vertical muscles solved the second problem, It was a successful device.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 4 shows an embodiment of a backrest device having a structure for balancing using the fulcrum of the present invention.
The first projection 23 is composed of the cushion 21, the base 20, and the boss 22, the second projection 28 is composed of the cushion 26, the base 25, and the boss 27, and the support base 34 is the bearing 24, the bearing 29, and the arm 30. It is composed of a fulcrum 31.
The first projection 23 is connected to a support base 34 via a shaft 19, and the second projection 28 is connected to a support base 34 via a shaft 32.
The support base 34 is placed on the back of the chair, the first convex portion 23 is placed on the upper portion of the back, and the second convex portion 28 is placed on the lower portion of the back. The device is sandwiched between the back and the back of the chair. Is used by leaning back toward the back of the chair.
At this time, the first convex portion 23 and the second convex portion 28 rotate through the shafts 19 and 32, respectively, and maintain the posture by vertically supporting the central portion of the back along the shape of the spine, Even if the muscles are relaxed with the consciousness of the center, the body naturally opens forward.
In addition, the fulcrum 31 follows the angle of leaning of the back and rolls on the surface of the backrest to balance the force of the first convex portion 23 and the second convex portion 28 to push and support the back, thereby helping muscle relaxation. There is.
[0006]
The support base 34 can be made of a rigid material such as a steel plate (the fulcrum 31 is best made of rubber because of frictional force). It is possible to obtain the improvement of the feeling and the good feeling of use.
When a hard rubber having high strength is used, it can be used alone as a material, but when a soft rubber is used, reinforcement is required.
FIG. 5 shows a structure in which soft rubber is used as a material.
The arm 30 is made of a soft rubber material, and the metal arm 36 and the metal arm 37 made of a steel plate are set on the arm 30 with the shafts 39, 41, and 43 to reinforce the arm. It is structured to be able to rotate about a shaft 43 which is an intersection.
Thereby, the deflection of the soft rubber material can be sufficiently utilized.
[0007]
【Example】
The fulcrum 31 is set not near the midpoint between the first convex portion 23 and the second convex portion 28 but near the second convex portion where a large load is applied, but the fulcrum 31 shown in FIG. And has a structure that can be moved and adjusted by dividing the arm into two into an arm 31a and an arm 31b.
FIG. 7 shows an example of the use, and shows a special use method in which the fulcrum 31a and the viewpoint 31b are set apart from both ends and used as a pillow.
In the case of the shape shown in FIG. 7, a portion (in the vicinity of the first atlas) from the neck to the back of the head is placed in the space 80 between the first convex portion 23 and the second convex portion 28, so that the pillow can be used as a pillow. Use is also possible.
FIG. 8 shows that the first projection 50, the second projection 51, and the base 49 are formed as a common projection 52 having an integral structure, and the load received by the first projection 50 and the second projection 51 is absorbed by the bending of the rubber plate 47. This balances the following of the angle depending on the sitting posture and the distribution of the vertical force.
It is practical to install the rubber plate 47 at the center of the base 49 instead of dividing it vertically.
The use of the rubber plate 47 not only balances the upper and lower portions between the first convex portion 50 and the second convex portion 51 but also acts to balance the left and right sides. When you take this device, use this device to feel the repulsive force of the first convex portion 50 and the second convex portion 51, maintain your posture consciously, and relax your muscles and body strain by releasing the force. It is useful for correcting.
The method of use is to place the feet 48 on the chair seat and lean against the back of the chair.
Adjustment of the height based on the difference in height is performed by moving the rubber boss 46 on the pipe rail 45.
FIG. 9 shows a structure using springs 54 and 55 instead of the structure shown in FIG.
FIG. 10 shows a structure in which a shock absorber 60 is added to the structure shown in FIG. 9 so as to act when the tip 60a of the shock absorber 60 reaches the surface 56a of the base 56.
[0008]
Since the device of the present invention can be used as a pillow, FIG. 11 shows an example in which the device having the structure shown in FIG. 4 is used vertically as a pillow.
In a chair in which the backrest 64 of the chair has a sufficient height, the first convex portion 23 is applied to the center of the occipital region 62 (near the first atlas) of the person 61, and the second convex portion 28 is positioned near the upper portion 63 of the thoracic vertebra. It is intended to be used against your back.
The description of the case where the device having the structure shown in FIG. 7 is used as a pillow has been described above. In this case, the portion of the space 80 between the first convex portion 23 and the second convex portion 28 that extends from the nape to the back of the head (No. (In the vicinity of one vertebra), the first convex portion 23 and the second convex portion 28 rotate, and the convex portion 66 and the base 67 of the cushioning material shown in FIG. It has been discovered that the structure is such that the apex becomes a space 80, and the neck is stretched and fixed, so that when used in a chair or the like, the neck becomes lighter and a sense of rest is obtained. FIGS. 12 and 13 illustrate an example of using a pillow in a chair according to the present invention.
The cushion material 66 is for supporting the portion of the occipital region from the nape of the neck (near the first atlas) and does not support the entire head. Therefore, the cushion material 66 has a narrow width and is attached to the base 67. The pillows are arranged symmetrically so that the vertices of the triangle take up the space 80.
The method of determining the position of the pillow is to adjust the angle using the pipe 72, the boss 70, and the fixing screw 71, to adjust the height using the pipe 69, the boss 68, and the fixing screw 73, and to use the pipe 69 and the pipe 69 using the angle adjusting mechanism 74. The adjustment is performed by adjusting the relative angle of 75.
[0009]
【The invention's effect】
By using the fulcrum 31 and the rubber plate 47, the balance between the upper and lower forces for supporting the back is improved, and the muscular stress around the back muscles necessary for maintaining the posture for correct relaxation can be reduced, and the feeling of use has improved.
The removal of the angle adjustment mechanism 12 makes it lightweight and compact and can be carried and used.
In the use test in which this device was used as an adapter in a car chair, chaotic vibrations were applied, so there was a massage effect, concentration during driving was not interrupted, and the burden on the internal organs was reduced and mood was reduced. There are many reports that it has improved, and it is a backrest device that can be applied to vehicle chairs.
By using the device according to the present invention, great relaxation can be obtained, and there are effects such as stress relief, increase in concentration, and prevention of diseases caused by stress. .
In addition, when using the device of the present invention as a pillow, the movement is suppressed by the head being pinched, and the neck is mainly supported, so that the neck is stretched and stabilized, and the body is naturally straightened (twisted left and right) There is no effect), and a feeling of rest can be obtained.
Further, since the space 80 does not accumulate heat in the back of the head, there is an effect of preventing head irritation such as prevention of irritation.
[Brief description of the drawings]
FIG. 1 is a perspective view of a conventional “furniture for sitting”.
FIG. 2 is a side view showing the actual use of the conventional “furniture for sitting”.
FIG. 3 is a side view of a conventional “support for furniture for sitting”.
FIG. 4 is a side view showing an embodiment of the backrest device according to the present invention.
FIG. 5 is a side view showing an embodiment of the backrest device according to the present invention.
FIG. 6 is a side view showing an embodiment of the backrest device according to the present invention.
FIG. 7 is a side view showing an embodiment of the backrest device according to the present invention.
FIG. 8 is a perspective view showing an embodiment of a backrest device according to the present invention.
FIG. 9 is a side view showing an embodiment of a backrest device according to the present invention.
FIG. 10 is a side view showing an embodiment of a backrest device according to the present invention.
FIG. 11 is a side view showing an example of use of the back pushing device according to the present invention.
FIG. 12 is a bird's-eye view showing an embodiment of a pillow according to the present invention.
FIG. 13 is a side view showing an example of use of the pillow according to the present invention.
[Explanation of symbols]
7 Base plate 7a Base plate upper 7b Base plate lower 8 Axis 9 Axis 12a Adjustment lever 33 Support pipe 35 Spring strength adjustment part 40 Hole 42 Hole 44 Hole 52 Common convex part 53 Spring stopper 56 Base 57 Screw part 58 Bolt 59 Spring fixed Ring 65 Chair seat 76 Head 77 Upper body 78 Neck 79 Shoulder

Claims (5)

A backrest device comprising the first protrusion 23, the second protrusion 28, and the base 34. A backrest device including a first convex portion 50, a second convex portion 51, a base 49, a plate rubber 47, a rubber boss 46, and a pipe rail 45. A backrest device comprising a first convex portion 50, a second convex portion 51, a base 49, and a spring 55 base 56. A backrest device comprising a first convex portion 50, a second convex portion 51, a base 49, a spring 55 base 56, and a shock absorber 60. A pillow comprising a cushion material 66, a base 67, and a space 80.

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