JPH0415683B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a chair.

PRIOR TECHNOLOGY There are many types of chairs, such as those for office use, study use, comfort use, various types of work, and physical correction. It is often desirable to have something that allows you to move your body. However, conventional chairs generally have a small range of movement in which the posture of the seater can be changed, and chairs with a large range of movement are bulky, such as rocking chairs with arcuate legs.

Problems to be Solved by the Invention The present invention solves the problems of the prior art, and provides a chair that has a large range of motion in which the posture of the sitting person can be changed and is compact considering the size of the range of motion. The purpose is to

Means for Solving the Problems The object of the present invention is to provide: a seat, a backrest, a base that contacts an installation surface during installation, a seat front support frame and a seat that connect the seat and base. The seat is provided with a seat front axis at the front and a seat rear axis at the rear, and the seat front axis and the seat rear axis extend in the left-right direction of the chair. The base portion includes a base rear shaft extending in the left-right direction of the chair below the rear end of the seat, a base front shaft extending in the left-right direction of the chair below the front end of the seat, and these front base shafts. and a base connecting member that holds the base rear shafts so as not to separate from each other by more than a certain distance, the seat front support frame extending to connect the seat front shaft and the base rear shaft, The seat rear support frame is rotatably attached to the seat via the seat front shaft, and is rotatable relative to the chair installation surface via the base rear shaft. Extends to connect the seat rear axis and the base front axis, is rotatably attached to the seat via the seat rear axis, and is rotatable relative to the chair installation surface via the base front axis. The backrest portion has a lower portion supported by the seat rear support frame and extends upward, and extends upwardly from the back of the sitter at a position corresponding to a height from the waist to the upper back of the sitter. This is achieved by the chair characterized in that it has a support part for tilting (first invention).

Instead of the above-described one, the backrest portion may be supported by the seat front support frame and extend upward (second invention).

In any of the above cases, the support part is a shaft extending in the left-right direction of the chair, and the backrest part is
The seat may include a backrest plate that is rotatably supported around the axis and is disposed such that its lower end is at or above the waist height of the seater.

Furthermore, instead of the above-described one, the backrest portion may have a lower portion supported by the seat portion and extend upward (third invention).

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

1 to 5 show an embodiment of the first invention, in which FIG. 1 is a left side view (symmetrical to the right side view), FIG. 2 is a front view, and FIG. 3 is a rear view. FIG. 4 is a plan view, and FIG. 5 is a bottom view. This chair 1 includes a seat part 2, a backrest part 3, a base part 4 in contact with a chair installation surface, a front seat support frame 5, a rear seat support frame 6, and a stopper 7.
The seat part 2 includes a front seat shaft 20 at the front end, a rear seat shaft 21 at the rear end, and a cloth support part 22 having a cylindrical part through which these shafts 20 and 21 are rotatably passed. Receiver part 2
2 and a cushion plate 23 placed on the cushion plate 23. The shafts 20 and 21 both extend in the left-right direction of the chair, and the seat front shaft 20 is divided into left and right parts, and the seat rear shaft 2
1 is integrated. The base portion 4 is located below the rear end of the seat portion 2, more specifically, a backrest portion 3 which will be described later.
A base rear shaft 40 located approximately directly below the support shaft 31 of the base, a base front shaft 41 located approximately directly below the front end of the seat portion 2, and a chain made to hold these shafts 40, 41 so as not to separate from each other by more than a certain distance. A base connecting member 42 is provided. The base rear shaft 40 is divided into left and right parts, and the base front shaft 41 is integrated, and both extend in the left-right direction of the chair. The seat front support frame 5 is
The seat front shaft 20 and the base rear shaft 40, which are each divided into left and right parts, extend so as to be connected at the inner ends of each left part and the inner ends of each right part. The seat rear support frame 6 extends so as to connect the seat rear shaft 21 and the base front shaft 41 at their left ends and right ends. The backrest portion 3 includes a backrest frame 30 that extends continuously upward from the rear end of each seat rear support frame 6, and a backrest frame 30 that extends continuously upward from the rear end of each seat rear support frame 6, and a backrest frame 30 that extends upwardly from the rear end of each seat rear support frame 6.
0, and a backrest plate 32 rotatably attached around the support shaft 31. The backrest plate 32 has a rectangular shape when viewed from the front, is disposed such that its lower end is at the height of the lower back of the seater, and the backrest surface has cushioning properties. The stopper 7 includes a stopper frame 70 provided between these frames 5 in the front half of the seat front support frame 5, and a cloth tension member 71.
It is equipped with The tension member 71 has its rear end sewn to the fabric support part 22 near the seat rear shaft 21,
The front end is a cylindrical portion and is supported by a stopper frame 70 passing through the cylindrical portion. This tension member 7
As will be described later, the seat 1 is relaxed when the seat 2 is in a stable position and rearward from the stable position, and is provided in such a way that it becomes tense when the seat 2 is tilted excessively forward from the stable position. In this example, the seat front and rear axes 2
0, 21, base front/rear shaft 40, 41, seat front/
Rear support frames 5, 6 and backrest frame 30
It is made of metal pipe and is constructed as follows. The front seat shaft 20, the rear base shaft 40, and the front seat support frame 5 that connect these are each formed of a single pipe having a left side portion and a right side portion each having a U-shape when viewed from the front, and both are connected to a stopper. They are connected by a frame 70 and a reinforcing frame 50. The base front shaft 41, the seat rear support frame 6 extending rearward and upward from both ends of the shaft, and the backrest frame 30 further extending from the frame 6 are formed of a single pipe that is U-shaped in front view. extends to connect the rising pipes. As a result, the seat front support frame 5 is rotatable with respect to the seat 2 together with the seat front shaft 20, and is rotatable with respect to the chair installation surface together with the base rear shaft.
Similarly, the seat rear support frame 6 has a seat rear shaft 21
It is rotatable both with respect to the seat part 2 and with respect to the chair installation surface together with the front axis of the base.

Next, the function of the chair 1 based on these configurations will be described. The front seat support frame 5 and the rear seat support frame 6 extend obliquely so as to intersect with each other when viewed from the left and right sides of the chair. The weight of the chair components and the weight of the sitter act to expand these frames in the vertical direction around the chair's lateral visual intersection point (A), but this expansion is caused by the seat part 2 and the seat part 2 that pivotally support these frames. It is stopped by the base part 4. On the other hand, these frames 5 and 6 are rotatable relative to the seat 2 and the chair installation surface via the front shafts 20, 40 and rear shafts 21, 40 of the seat 2 and base 4, respectively. The seat portion 2 swings relative to the chair installation surface as the frames 5 and 6 rotate. This oscillation is performed as follows. For example, the 6th
As shown in the figure, when the seat 2 moves rearward (indicated by a solid line) from a substantially horizontal position (indicated by a dashed line)
, due to the rotation of the front seat support frame 5 in the upright direction and the rotation of the rear seat support frame 6 in the inclination direction, the seat 2 is moved rearward more rapidly than the respective frame rotation speeds. Rotate. When performing the opposite operation, as shown in FIG. 7, it similarly rotates rapidly toward the front. As a result, the swinging range of the seat portion 2 is larger than the swinging range of the frames 5 and 6.
Furthermore, even if the seater rocks the chair by applying force to the seat or backrest from a stable state,
When the force is released, the chair returns to its original stable state and functions as a swingable chair. This is seat part 2
supports most of the seater's weight, and the lateral visual intersection point (A), which is the instantaneous center of the seat rocking, shifts to the seater's center of gravity as these frames mutually rotate in the same direction. This seems to be because the center of gravity moves faster than the direction of movement of the center of gravity. In this way, the effect of returning to a stable state is obtained by the frames that intersect in the side view of the chair, and these frames are connected to the base rear shaft 40 and the base rear shaft 40 that extend in the left-right direction of the chair below the rear end of the seat and below the front end of the seat, respectively. By being connected to and supported by the base front shaft 41, the chairs are prevented from falling and are able to swing. Therefore, it is possible to prevent the chair from overturning without requiring a base portion that extends forward and backward from below the front and rear ends of the seat, and the chair can be made compact despite its large range of motion. Next, the state of use of the chair 1 shown in FIGS. 8 and 9 will be explained. Figure 8 shows the seated person in a relaxed, natural sitting state, and Figure 9 shows the seated person leaning backwards. However, the inclination of the seat part 2 is slightly more forward than when it is empty due to the elastic expansion of the support part 22 due to the weight of the seater. The backrest portion 3 has a support shaft 31 for supporting the sitter's backward tilt at a position corresponding to the height of the central part of the back of the sitter, so the sitter cannot tilt his or her upper body in the direction of the backrest portion 3. You will feel the pleasure of being pressed against your back and stretching your lower back and spine. Moreover, the backrest portion 3
is supported by the seat rear support frame 6, so
It moves differently from the seat part 2, which further amplifies the comfort. This amplified pleasure is thought to be obtained based on the following effects. When the seater tilts his or her upper body in the direction of the backrest 3, the seat rear support frame 6 rotates rearward together with the seat front frame 5, and as a result, the seat 2 rotates backwards as described above. 5 and 6, and tries to approach the backrest part 3 by rotating backwards faster than those of 5 and 6. Therefore, the seater's back is pressed as shown by the arrow (B) in Figure 9, and the seat 2 rapidly rotates backwards.
As a result, as shown by arrow (C), the rear part of the lower body, especially the rear part of the thigh, is pressed. The amplified comfort is thus achieved by applying pressure to the rear of the lower body in a sitting position, thereby preventing the body from sliding on the seat and making the pressure force on the lower back or back more effective. It is thought that this can be achieved by either or both of pressing the rear part of the lower body, particularly the rear part of the thighs, at the same time. In particular, the chair 1 includes a backrest plate 32 on the backrest portion 3 that can rotate around a support shaft 31. Therefore, when the seated person tilts his or her upper body in the direction of the backrest portion 3, the backrest plate 32 is rotated around the shaft 31 and is arranged so as to be at or above the waist height of the seated person. The lower end of the backrest plate 32 presses the waist or back of the seater more strongly than a simply fixed support (arrow (B')), further enhancing the above-mentioned effect. The stopper 7 becomes tense when the seat part 2 inclines forward to some extent from the stable state of the chair 1, and prevents the forward inclination. As shown in FIG. 7, when leaning forward from a stable state, the fabric tension member 71
This is because the seat support frame 5 that supports the front end rotates faster than the seat rear support frame 6 that supports the rear end of the tension member 71, and the space between both frames expands in the vertical direction. As the chair tilts backward from the stable state, the seat front support frame 5 approaches the seat rear shaft 21, as seen in FIG. Excessive backward tilting of the section 2 is prevented. Said lateral chiasm point (A)
The position of the seat can be determined as appropriate depending on the purpose and dimensions of the chair, but normally when the seat is in a natural sitting position, that is, when the seat is approximately horizontal or slightly tilted backwards, It is desirable to set it near the extending vertical plane. This prevents the chair from shaking during the sitting operation and provides stability. However, in the case of a chair that is used with the feet lifted off the floor after sitting, such as some types of rocking chairs, the lateral visual intersection point (A) is located in front of the vertical plane when the seat is approximately horizontal. It is desirable to set it to . As a result, after sitting down, the seater can easily swing his or her feet by setting the chair in a stable position after it has been rotated backwards. In this way, the position of the lateral visual chiasm point (A) affects chair stability during sitting motion because the lateral visual chiasm point (A) is the momentary center of seat rotation, and the seater's center of gravity is This seems to be because the seat is most stable when the instantaneous center is within the vertical plane passing through it. That is, when the lateral visual chiasm point (A) is in front of the vertical plane, the seat rotates rearward in order to move the lateral visual chiasm point (A) rearward with the sitting motion, When the lateral visual intersection point (A) is behind the vertical plane, the rotation is opposite to this. In order to more effectively prevent the chair 1 from falling backwards, it is desirable that the base rear shaft 40 be located below the rear end of the seat, but further to the rear. Of course, it is not necessary to provide it so far back that it impairs the compactness of the chair; for example, it is sufficient to position it approximately directly below the upper end of the backrest portion 3. In addition, the return action when the chair 1 swings is determined by the distance between the front and back axes of the seat and the distance between the front and back axes of the base.
The larger the height of the seat in the vertical plane,
strongly, and usually the distance is set to be greater than the height.

10 to 12 show an embodiment of the second invention, in which FIG. 10 is a side view, FIG. 11 is a front view, and FIG. 12 is a bottom view. This chair 1A
The chair 1 has substantially the same structure as the chair 1 of the above-described example, and similar members and parts are designated by the same reference numerals in the drawings. In the chair 1A, unlike the chair 1, the backrest frame 30A of the backrest part 3(A)
are supported at their lower ends by the lower half portions of the two front seat support frames 5, and extend upward, to which, like the chair 1, a support shaft 31A is attached. The chair 1A also provides the same comfort as in the chair 1, in which the lower back and back muscles are stretched, and an amplified comfort in that the rear part of the lower body is pressed in addition to the lower back or back. This is also the backrest part 3
While A rotates together with the seat front support frame 5,
This is based on the fact that the seat portion 2 rotates more rapidly than the backrest portion 3A due to the rotation of both the seat front support frame 5 and the seat rear support frame 6. However, since the seat front support frame 5 rotates around the base rear shaft 40 rearward from just below the rear end of the seat 2, the backrest 3A
The rotation is faster than the rotation around the base front shaft 40 located substantially directly below the front end of the seat 2 as in the chair 1, and the difference between the rotation speed and the rotation speed of the seat 2 tends to be smaller. However, as the seat front support frame 5 rotates rearward, the backrest 3A rises relative to the sitter and rotates rearward, resulting in a pressing effect on the waist or back that is different from that of the chair 1. is obtained.

13 to 15 show an embodiment of the third invention, in which FIG. 13 is a side view, FIG. 14 is a front view, and FIG. 15 is a bottom view. This chair 1B
The chair 1 also has substantially the same structure as the chair 1 of the above-mentioned example, and the same reference numerals are given to like members and parts in the drawings. In the chair 1B, unlike the chair 1, the seat 2B has a seat front axis 20 and a seat rear axis 21.
A seat frame 24 is rotatably supported by the seat frame 24 and extends in the front-rear direction at the left and right ends of the seat 2B.
A backrest frame 30B of the backrest portion 3B is provided so as to extend continuously upward from the seat frame 24, and a backrest plate 32B is fixed to this. In the chair 1B, the backrest portion 3
B and the seat portion 2B rotate at substantially the same speed. Therefore, the effect based on the relative movement between the backrest and the seat as in the chairs 1 and 1A cannot be obtained, but they can return to the stable seating state at substantially the same speed as described above. As a result of the rocking motion, a feeling similar to that of a rocking chair can be obtained. The backrest part 3B is attached to the seat part 2 by a spring or the like.
It goes without saying that it may be possible to move or rotate it slightly. Further, the backrest plate 32B may be provided rotatably by a support shaft like the chairs 1 and 1A, or the backrest plate 32B may be fixed with a support shaft 31B at the center and a pin 33 at the lower part as shown in the figure. It can also be made rotatable by removing 33. Base front shaft 41 of base part 4B
B includes a shaft portion 410 that extends continuously from the seat rear support frame 6 and a cylindrical portion 411 that extends in the left-right direction of the chair so as to pass through the shaft portion 410.
B includes a shaft portion 400 that continuously extends from the seat front support frame 5 and a cylindrical portion 401 that passes through the shaft portion 400. The base connecting member 42B is made of metal pipe and connects the cylindrical parts 411 and 401. As a result, the shaft portions 400, 410 rotate within the cylindrical portions 401, 411 when the frames 5, 6 rotate, and the portion that contacts the chair installation surface is kept stationary, to prevent scratches on the surface. It's advantageous. The stopper 7B is equipped with a metal pipe stopper rod 72 provided between the two seat rear support frames 6 at a height approximately at the center of the frames 6.
If the seat tilts forward too much, it comes into contact with the seat front support frame 5 and acts to prevent further forward tilt.

In the above example, the axes of the seat and base parts and the frame extending to connect these axes are shown as being integrated, but it goes without saying that these may be provided separately. . Although the receiving frame portion 22 and the base connecting member 42 are made of cloth and chain, they may be made of a material with high rigidity. However, by making it from such a flexible material, it is possible to fold it, and by making the effective length variable, the height and inclination of the seat part can be adjusted. . Regarding the above examples, especially chairs 1 and 1A, the shape of the backrest part can be in addition to the one shown in the example, and can have various shapes suitable for obtaining pressure on the waist or back by leaning backwards of the seater, for example, a shape that is curved in side view. It can also be shaped like a pillow. In addition to the example shown, the stopper may be appropriately constructed of a member that tensions or comes into contact when the seat is tilted forward or backward.

Effects of the Invention As is clear from the above, according to the present invention, it is possible to provide a chair that has the following effects.
In other words, the seat front and rear support frames, which are arranged so as to intersect when viewed from the side of the chair, are rotatably supported relative to the seat and base, which allows the seater to change their posture. It has a large movable range and can be made compact considering the size of the movable range. In addition, in the first invention in which the backrest is supported by the seat rear support frame and the second invention in which the backrest is supported by the seat front support frame, the seat and the backrest may move differently from each other. By doing so, the seater can enjoy great pleasure as the lower back and back muscles stretch when tilting the upper body backward. In addition, when the backrest is equipped with a rotatable backrest plate, as the backrest plate rotates, a greater pressing force is obtained from the lower part of the plate, so that when the seater leans back, the seater receives an even greater pressing force. You can get pleasure. In the third aspect of the invention, in which the backrest is supported by the seat, the seat and the backrest are integrally swung to return to a stable sitting state, so the seated person can sit on a rocking chair. You can get a feeling of use.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention, and FIG.
A side view of the embodiment, FIG. 2 is a front view thereof, FIG. 3 is a rear view thereof, FIG. 4 is a plan view, and FIG. 5 is a bottom view.
FIGS. 6 and 7 are side views schematically showing the swinging state, FIGS. 8 and 9 are side views showing the usage state,
Fig. 10 is a side view of another example, Fig. 11 is a front view thereof, Fig. 12 is a bottom view thereof, Fig. 13 is a side view of yet another example, Fig. 14 is a front view thereof, and Fig. 15. is its bottom view. 1, 1A, 1B...Chair, 2, 2B...Seat,
3, 3A, 3B... backrest portion, 4, 4B... base portion, 5... seat front support frame, 6... seat rear support frame, 20... seat front axis, 21... seat rear Shaft, 31, 31A, 31B...Support shaft, 3
2, 32A, 32B... Backrest plate, 40, 40
B... Base rear shaft, 41, 41B... Base front shaft, 42, 42B... Base connection member.

Claims (1)

[Claims] 1. A chair comprising a seat, a backrest, a base that contacts an installation surface when installed, and a front seat support frame and a rear seat support frame that connect the seat and base. The seat is provided with a seat front axis at the front and a seat rear axis at the rear, and the seat front axis and the seat rear axis extend in the left-right direction of the chair, and the base , a base rear axis extending in the left-right direction of the chair below the rear end of the seat, a base front axis extending in the chair left-right direction below the front end of the seat, and the base front axis and the base rear axis being mutually constant. a base connecting member that holds the seat so that they do not separate by more than a distance, and the seat front support frame extends to connect the seat front shaft and the base rear shaft, and the seat front support frame extends through the seat front shaft The seat rear support frame is rotatably attached to the seat and is rotatable relative to the chair installation surface via the base rear axis, and the seat rear support frame supports the seat rear axis and the base front axis. The backrest portion extends in a connected manner, is rotatably attached to the seat portion via the seat rear shaft, and is rotatable relative to the chair installation surface via the base front shaft; , whose lower part is supported by the seat rear support frame and extends upward, and has a support part for supporting the seater's backward tilt at a position corresponding to any height from the waist to the upper back of the seater. The chair is characterized by: 2. The support portion of the backrest portion is an axis extending in the left-right direction of the chair, and the backrest portion is rotatably supported around the axis and arranged such that the lower end is at least the waist height of the seater. 2. The chair according to claim 1, further comprising a backrest plate. 3. A chair comprising a seat, a backrest, a base that comes into contact with an installation surface when installed, and a seat front support frame and a seat rear support frame that connect the seat and base, The front part is provided with a seat front axis and the rear part is provided with a seat rear axis, and these seat front axis and seat rear axis extend in the left-right direction of the chair, and the base part is connected to the seat rear end. a base rear axis extending in the left-right direction of the chair below the front end of the seat; a base front axis extending in the chair left-right direction below the front end of the seat; the seat front support frame extends to connect the seat front shaft and the base rear shaft, and rotates with respect to the seat via the seat front shaft. The seat rear support frame extends to connect the seat rear axis and the base front axis. , the backrest is rotatably attached to the seat via the seat rear axis, and is rotatable relative to the chair installation surface via the base front axis; The seat is supported by a front support frame and extends upward, and is characterized by having a support part for the seater's backward tilt at a position corresponding to any height from the waist to the upper back of the seater. The chair. 4. The support part of the backrest part is an axis extending in the left-right direction of the chair, and the backrest part is supported so as to be rotatable around the axis, and the lower end is disposed so as to be at or above the waist height of the seater. 4. The chair according to claim 3, further comprising a backrest plate. 5. A chair comprising a seat part, a backrest part, a base part that comes into contact with the installation surface when installed, and a seat front support frame and a seat rear support frame that connect the seat part and the base part, The front part is provided with a seat front axis and the rear part is provided with a seat rear axis, and these seat front axis and seat rear axis extend in the left-right direction of the chair, and the base part is connected to the seat rear end. a base rear axis extending in the left-right direction of the chair below the front end of the seat; a base front axis extending in the chair left-right direction below the front end of the seat; the seat front support frame extends to connect the seat front shaft and the base rear shaft, and rotates with respect to the seat via the seat front shaft. The seat rear support frame extends to connect the seat rear axis and the base front axis. , the backrest is rotatably attached to the seat via the seat rear axis, and is rotatable relative to the chair installation surface via the base front axis; The chair is characterized in that it is supported by a section and extends upwardly.