JPH09108069A - Seat with angle-adjustable backrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible for the user to use a seat comfortably by allowing a backrest to be adjusted in an angle so that its top may be inclined most deeply backward in the height direction from the center of its width. SOLUTION: The user sits on a seat and operates a lever 41 of an operating section 40 installed on an armrest E to let a controlling section 50 operate. A fluid pump 30 is started to operate at a command signal from the controlling section 50. By supplying pressurized fluid to a left fluid cylinder 20L and backing a piston lever 21L, the top of a left movable supporting frame 122L is backed. Thereby, the left movable supporting frame 122L is so displaced as to be inclined backward with respect to a fixed supporting frame with a hinge as a fulcrum and at the same time, a part of a backrest installed on the front face of the left movable supporting frame 122L that is near the top of the backrest that supports the left shoulder of the user is also inclined backward. When the user uses the seat with its back abutted against the backrest under this condition, the user can sit on the seat stably and comfortably for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of seats for vehicles, seats such as chairs and sofas in which the directional direction of the backrest can be changed and adjusted.

[0002]

2. Description of the Related Art Conventionally, in seats of vehicles such as automobiles and vehicles such as airplanes and ships, and chairs for office work or learning, when sitting for a long time, the posture does not change, so rather fatigue of the upper body However, various devices have been proposed that can adjust the tilt of the seat back support portion in the front-rear direction.

As an example thereof, Jitsuko Sho-350416
No. 4 (publicly known example) is mentioned.

In the backslide upright type chair of the above-mentioned known example, the lever 18 is operated to adjust the backslide 4 to the rearward tilt position at an arbitrary angular position with the backslide tilting shaft 11 as a fulcrum. The present invention relates to a so-called reclining type chair configured as described above.

Further, with respect to the human body, the relative positions of the respective skeletons can be freely changed with the joint as a fulcrum, and the movable change amount of the relative position has not only individual differences but also its movable position. It is widely known clinically that the amounts are not necessarily equal in the front-back, left-right, or up-down directions with respect to the center (for example, the front direction of the body).

Therefore, in a seat such as a seat, its shape and dimensions are basically adapted not only to the physique and constitution of the user, but also to their athletic ability and further the above-mentioned movable characteristics of the body. It was also known that it was preferable to choose one.

[0007]

As described above, maintaining the same posture for a long period of time causes a muscle pain in a seat that conforms to the physique and constitution of a human being or its movement characteristics. It is obvious that this will cause pain, and as a solution to this problem, a known example has been proposed, but in this case, the inclination angle of the backslide 4 is simply changed in the front-back direction, and the position of the center of gravity of the body is changed. Since it moves only back and forth, it is not always possible to match the physical constitution and exercise characteristics of the user.

Therefore, there has been a long-awaited demand from the user to provide a chair which is medically adapted to the physique and constitution and which can be comfortably seated for a long time.

A first object of the present invention is to construct a backrest of a chair or the like so that both shoulders can be supported independently in a backward tilted manner with the center in the width direction of the upper half of the user as a fulcrum. By doing so, it is possible to provide a seat in which the backrest can be oriented in a direction that matches the displacement of the body axis of the upper body of the user, so that the user can comfortably use the seat.

A second object of the present invention is to allow a user who is seated by a backrest to support his / her shoulder in an inclined rearward direction, with his waist directed toward the front, stably and with a displacement of the body axis. To provide a seat in which the upper half of the body can be twisted and supported so as to be aligned with, and a seating posture that does not change for a long period of time can be maintained with less fatigue.

A third object of the present invention is to provide a seat provided with a backrest which is easy to operate.

A fourth object of the present invention is to provide a seat which has a simple structure and is compact and suitable for use in a transportation vehicle or the like.

[0013]

The structural features of the present invention for achieving the above object are as follows.

(1) A seat of a chair or the like in which the angle of a backrest for supporting the back of a seated user can be changed and adjusted, and the seatback is provided in a height direction with a center portion in the width direction as a starting point. Seat with an adjustable backrest whose top is deepest and the angle can be adjusted so that it can be tilted backward.

(2) In the area where the backrest supports both shoulder positions of the user, the backrest can be tilted left and right independently to the deepest position, and the angle-adjustable backrest described in (1) is provided. A sheet.

(3) A movable support frame is connected to a fixed support frame for supporting the backrest, and the movable support frame is capable of tilting backward in a double-door shape with the center line of the user's back as a fulcrum. A seat provided with the backrest having an adjustable angle according to (1) or (2), which is hinged to the fixed support frame.

(4) The above-mentioned (1) or (1), in which the supporting portion for supporting the backrest of the backrest is a unitary body and is made of a material having flexibility capable of being forcibly bent. 2) A seat with a backrest whose angle can be adjusted as described.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 shown in FIG. 1 to FIG.
The invention adopts a seat-type seat, and its contents are as follows.

That is, in this seat-chair type seat (S), a cushion (C) is fixedly mounted on a base (B), armrests (E) are arranged on both sides thereof, and a backrest is provided on its back. The part 1 is arranged upright.

The backrest 1 includes a backrest 11 formed of a flexible, elastic and stretchable material and a supporting portion 12 for the backrest 11, which is connected to the base (B). It is configured to be carried by the support columns 13.

As shown in FIGS. 2 and 3, the support portion 12 is fixed to the support column 13, and the back support 11 is connected to the front surface of the support portion 12 in a substantially triangular fixed support frame 12.
1 and a pair of left and right movable support frames 122L and 122R, each of which has a front surface similarly connected to the backrest 11, and has a pair of left and right movable support frames 122L and 122R. 122L and 122R are rotatably hinged.

Further, the left and right movable support frames 122L, 12
Left and right pivots 15L and 15R are provided on the rear surface near the top of 2R, while a cantilever support rod 16 is provided on the top of the column 13.
Is projected rearward, and a fulcrum protrusion 17 is projected on the upper surface thereof.

A pair of left and right fluid actuators 20L, 2 for displacing the left and right movable support frames 122L, 122R in the backward tilt direction.
The outer end of the left piston rod 21L at 0R is pivotally attached to the left pivot 15L, and the outer end of the right piston rod 21R is pivotally attached to the right pivot 15R, and the left and right cylinders 22L and 22R are attached. Left and right connecting rods 23L, 2 protruding from the rear end
The tail end of 3R is pivotally attached to the fulcrum protrusion 17.

Reference numeral 19 in the drawing shows a reinforcing rod for supporting the fixed support frame 121.

Next, the left and right fluid actuators 20L, 20R
A fluid pump 30 capable of supplying a fluid such as air is linked to each of the left and right fluid actuators 20L and 20R, and is controlled by operating a lever 41 of an operating portion 40 provided on the armrest portion (E). By operating the portion 50, the fluid can be supplied to and discharged from the required left or right fluid actuators 20L and 20R.

Next, the method of use will be described. Prior to this, the deviation of the body axis of the user must be detected in advance.

As already described in the section of the prior art, it is known that the turning angles in the left and right directions centering on the spine position of the upper half of the human body are not necessarily equal. It is due to the misalignment of the axis, in the natural state the upper body stands up front,
This point becomes clear when it is twisted in the right and left direction without difficulty.

For example, if the above-mentioned turning angle is 45 degrees to the left and 55 degrees to the right when measured using an appropriate angle measuring instrument, both angles are summed to 1
One half of 00 degrees, that is, a 50 degree position, that is, a position (right direction in FIG. 4 (Y)) that is displaced 10 degrees to the right with respect to the apparent front direction (direction in FIG. 4 (X)) is this user. It turns out to be the center of the true body axis.

Therefore, in this user, the upper body is oriented in the true front direction of the body axis by moving the movable support frame 122L supporting the left shoulder (SL) so as to incline backward by 10 degrees. In this state, the upper body is not overly stressed, and the user's waist is still facing the front. As a result, even if the user sits on the back 1 in the same posture for a long time. It is clear that the posture is stable, comfortable, and less fatigued.

Regarding the user, the first embodiment
In the case of using the seat (S), the user sits on the seat (S) as shown by the phantom line in FIG. 4, and the lever 41 of the operation unit 40 provided on the armrest (E) is used. By operating appropriately, the control unit 50 is actuated, the fluid pump 30 is started by a command signal from the control unit 50, pressurized fluid is supplied to the left fluid cylinder 20L, and the piston rod 21L is retracted to move to the left. The top of the support frame 122L is retracted to the imaginary line position in FIG. 2 and the solid line position in FIG.

As a result, the left movable support frame 122L is
Since the hinge 14 is used as a fulcrum, the hinge 14 is displaced to a position inclined rearward with respect to the fixed support frame 121.
Similarly, the region near the top where the backrest 11 that is continuously provided on the front surface of the 2L and carries the left shoulder (SL) of the user is also tilted backward.

Therefore, in this state, when the user brings his back into contact with the backrest 11 and uses it, the waist of the upper half of the body of the user is kept in the front direction (FIG. 4 (X)) and the body axis of the body is kept. Since the upper half of the body is seated with the upper body aligned in the true front direction (FIG. 4 (Y)) viewed from the displacement, the seat (S) can be stably seated for a long period of time and comfortably used.

As a result of measuring the displacement of the body axis, it is detected that the true front position of the body axis exists in the right direction. For the user, the right movable support frame 122R shown in FIG. It goes without saying that it is sufficient to make adjustment so as to incline backward as shown by the broken line, and bring the right shoulder (SR) into contact with this.

(Second Embodiment) The seat (S ') in the embodiment shown in FIGS. 5 and 6 has the same basic structure as that of the seat (S) in the first embodiment. I will explain mainly.

The characteristic feature of the seat (S ') of this embodiment is that the support frame 12' for supporting the backrest 11 'of the backrest 1'is provided as a single body with sufficient strength and is forcedly changed. The point is that it is made of, for example, a fiberglass material, a synthetic resin material, or a composite material made of a combination thereof, which has flexibility enough to be bent.

Therefore, in order to tilt the backrest 11 'backward, the left and right fluid actuators 20R', 20L 'are appropriately operated to selectively displace the top portion of the support frame 12' in a backward tilted state. As indicated by the phantom line in FIG. 3, the support frame 12 ′ is curved in a forward convex arc shape around the middle region thereof, and at the same time, the backrest 11 ′ is also similarly tilted backward. Similar to the case shown in FIG. 4 in the form 1, the vicinity of the shoulder portion of the user is stably supported in a backward tilted state, and the user can comfortably sit for a long time in a state of being aligned with the displacement of the body axis. It is possible.

The components common to those of the first embodiment are indicated by reference numerals with dashes in FIGS. 5 and 6 as appropriate.

Further, in the seats (S) (S ') in the first and second embodiments, the backrests 1, 1'are configured to be tilted rearward independently from each other by way of illustration. However, it is clear that the same result can be obtained by displacing the backrests 1 and 1 ′ so that they are tilted forward instead of tilted backward. I will omit the explanation.

Further, in each of the first and second embodiments, the seat (S) (S ') of the chair type has been described, but this structure is applied to the seat of a car or the back of a sofa or an easy chair. Needless to say, it is possible to obtain the same effective result by adopting, in particular, in the case of a car seat, when it turns around backwards when moving backward, in the case of a normal seat the backrest On the contrary, it becomes resistance and the neck is bent. However, in such a situation, it is possible to view the rear of the vehicle without difficulty by properly tilting the left and right movable support frames 122L or 122R rearward. Therefore, it can be said that it is more effective.

Further, the sheet (S) of each of the first and second embodiments
For (S '), the fluid actuator 2 is operated by remote control.
Although the left and right movable support frames 122L and 122R are configured to be movable by 0L and 20R, for example, a turnbuckle type expansion / contraction means is adopted instead of the fluid means, and the reversible motor can drive this. It is also possible.

Needless to say, as a simpler construction, the turnbuckle type expansion / contraction means may be manually adjusted.

[0042]

The remarkable effects of the present invention described above are as follows.

Since the backrest that can support both shoulders of the user independently in a backward tilted state is provided, the shoulders are tilted backward at a position that is aligned with the shift of the user's body axis, and the lumbar region The seat can support the back by directing it in the front direction, and it is possible to obtain a seat that is stable, comfortable and less tired even after long-term use.

Since the left and right movable support frames for supporting the backrest can be independently driven to adjust the backward tilted state, a seat which is easy to operate and highly useful can be obtained.

The structure is simple and can be widely used not only for seats for vehicles, aviation, ships, etc., but also for ordinary chairs, sofas, etc.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a seat according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a schematic plan view illustrating the usage state of FIG. 1.

FIG. 5 is a side view showing the second embodiment of the seat according to the present invention.

6 is a rear view of FIG.

[Explanation of symbols]

S, S'seat B, B'base C, C'cushion E, E'armrest 1,1 'backrest 11,11' backrest 12,12 'support part 13,13' strut 121 fixed support frame 122L , 122R Left-right movable support frame 15L, 15R Left-right pivot 16, 16 'Cantilever support rod 17 Support point protrusion 20L, 20R, 20L', 20R 'Left-right fluid actuator 21L, 21R Left-right piston rod 22L, 22R Left-right cylinder 23L , 23R Left and right connecting rod 30 Fluid pump 40, 40 'Operation part 41 Lever 50 Control part

Claims (4)

[Claims] 1. A seat for a chair or the like in which the angle of a backrest for supporting the back of a seated user can be changed and adjusted.
A seat having an angle-adjustable backrest, in which the top is deepest in the height direction and the angle can be adjusted so that the backrest can be tilted backward from the center in the width direction. 2. The seat with an angle-adjustable backrest according to claim 1, wherein the backrest is configured such that it can be tilted deepest independently to the left and right in a region where the backrest carries both shoulder positions of the user. . 3. A movable support frame is connected to a fixed support frame for supporting a backrest of the backrest, wherein the movable support frame is tilted backward in a double-door shape with the center line of the user's back as a fulcrum. The device according to claim 1 or 2, wherein the fixed support frame is hinged as much as possible.
A seat having a backrest whose angle can be adjusted as described. 4. The support portion for supporting the backrest of the backrest is a single body, and is made of a material having a flexibility capable of being forcibly bent. Seat with an adjustable backrest.