JPH048820Y2 - - Google Patents

Description

[Detailed explanation of the idea] 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. Something that allows you to move your body is often desired. However, conventional chairs generally have a small movable range in which the posture of the seater can be changed, and chairs with a large movable range have the problem of being stretched out like a rocking chair 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 that allows the seater to change their posture, 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 portion, a backrest portion,
A chair comprising: a base portion that contacts an installation surface during installation; a seat front support frame and a seat rear support frame that connect the seat portion and the base portion; and an armrest portion, the seat portion having a front portion. A seat front axis and a seat rear axis are provided at the rear and a seat rear axis, respectively, and the seat front axis and the seat rear axis extend in the left-right direction of the chair. A base rear shaft extending in the left-right direction, a base front shaft extending in the chair left-right direction below the front end of the seat, and a base connection that holds the base front shaft and the base rear shaft so that they do not separate from each other by more than a certain distance. the seat front support frame extends to connect the seat front shaft and the base rear shaft, and is rotatably attached to the seat via the seat front shaft; The seat rear support frame is rotatable with respect to the chair installation surface via the base rear shaft, and the seat rear support frame extends to connect the seat rear shaft and the base front shaft, and the seat rear support frame extends to connect the seat rear shaft and the base front shaft. The backrest is rotatably attached to the seat via the front axis of the base, and is rotatable relative to the chair installation surface via the front axis of the base, and the backrest has a lower portion supported by the seat rear support frame. The armrest has a support part for supporting the seater's backward tilt at a position corresponding to a height from the waist to the upper back of the seater, and the armrest part has a rear end extending upward from the seat member. an armrest main body that is rotatably supported about a rear support frame around an axis in the left-right direction of the chair and has an armrest portion above the seat; This is achieved by a chair comprising an armrest support that is rotatably coupled around a directional axis and whose lower end is coupled to the seat front support frame so as to be rotatable about the chair lateral axis. be done.

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

The figures show one embodiment of the present invention, in which Figure 1 is a left side view (symmetrical to the right side view), Figure 2 is a front view,
FIG. 3 is a rear view, FIG. 4 is a plan view, and FIG. 5 is a bottom view. This chair 1 has a seat part 2 and a backrest part 3.
, a base part 4 in contact with the chair installation surface, a seat front support frame 5, a seat rear support frame 6, and an armrest part 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. A cushion plate 23 is installed on the receiving rack part 22. The shafts 20 and 21 both extend in the left-right direction of the chair, the seat front shaft 20 is divided into left and right parts, and the seat rear shaft 21 is integrated.
The base portion 4 includes a base rear shaft 40 located below the rear end of the seat portion 2, more specifically, a base rear shaft 40 slightly rearward from directly below the support shaft 31 of the backrest portion 3, which will be described later, and a base front shaft approximately directly below the front end portion of the seat portion 2. 41 and these axes 40,4
1 and a chain base connecting member 42 that holds the bases 1 so as not to be separated from each other by more than a certain distance. 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 has a seat front shaft 20 and a base rear shaft 40, which are each divided into left and right parts.
The inner ends of each left side portion and the inner ends of each right side portion extend so as to be connected to each other. 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 part 3 is provided between the backrest frames 30 that continuously extend upward from the rear end of each seat rear support frame 6 and the backrest frames 30 at a position corresponding to the height of the central part of the back of the seater. It includes a support shaft 31 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. In this example, seat front/rear axes 20, 21, base front/rear axes 4
0 and 41, the seat front and rear support frames 5 and 6 and the backrest frame 30 are made of metal pipes and are 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 with a left side portion and a right side portion each having a U-shape when viewed from the front, and both are reinforced frames. 50,50. The base front shaft 41, the seat rear support frame 6 extending rearward and upward from both shaft bridges, and the backrest frame 30 further extending from the frame 6 are formed of a single pipe that is U-shaped in front view. 21 extends so as 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 also rotatable with respect to the seat portion 2, and is rotatable with respect to the chair installation surface together with the front axis of the base.

The armrest portion 7 includes a pair of left and right armrest bodies 70,
It is provided with an armrest support 71 that connects this. The armrest main body 70 is supported at its rear end by the backrest frame 30 via a rotation shaft 72, and in front thereof is supported by the armrest support 7 via a rotation shaft 73.
1, extends substantially parallel to the seat 2, and has an armrest portion 75 on its upper surface. Armrest support 7
1 is formed into a U-shape when viewed from the front, as shown in FIG. It is connected to the armrest main body 70 as described above. Rotation shafts 72, 73 and horizontal shaft 74
both extend in the left-right direction of the chair, and the armrest portion 7
can rotate in a plane perpendicular to these axes as the chair body swings. In this example, when the chair is in a stable state, both left and right ends of the horizontal shaft 74 abut against the seat rear support frame 6 from above,
This prevents the chair body from tilting forward. A receiver 77 made of a soft material such as rubber is adhered to the abutting portion of the rear seat support frame 6. However, the stable state of the chair depends on the weight balance of the entire chair, and in this state, the horizontal axis 74
may be set at a separated position above the seat rear support frame 6 so that the horizontal shaft 74 comes into contact with the seat rear support frame 6 when the seat is tilted forward to a certain extent.

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 base part that pivotally support these frames. It is stopped by 4. On the other hand, these frames 5, 6 are rotatable relative to the seat 2 and the chair installation surface via the front shafts 20, 40 and rear shafts 21, 41 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 view intersection point A, which is the instantaneous center of the seat rocking, changes the seater's center of gravity as the frame rotates in a direction away from the stable state. This seems to be because it moves in the direction of the center of gravity movement faster than the movement, and causes the moment due to the load to act in the direction of returning to a stable state. 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. Base front shaft 4
By being connected to and supported by the chairs 1 and 1, the chairs are prevented from falling over and can be swung. Therefore, it is possible to prevent the chair from tipping over without requiring a base portion that extends from the front and back of the seat portion forward and backward, 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, since the backrest part 3 is supported by the seat rear support frame 6, it moves differently from the seat part 2, thereby further increasing 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 support frame 5, and as a result, the seat 2 rotates as described above. It rotates backward faster than the frames 5 and 6 and tries to approach the backrest part 3. Therefore, the back of the seated person is pressed as shown by arrow B in FIG. 9, and the rear of the lower body, particularly the rear thighs, is pressed by the seat 2, which rapidly rotates backwards, as shown by arrow C. That will happen. 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 has a backrest plate 3 that can rotate around a support shaft 31 in the backrest part 3.
It is equipped with 2. Therefore, when the seater tilts his or her upper body in the direction of the backrest portion 3, the backrest plate 3
2 is rotated around the shaft 31, and the lower end of the backrest plate 32 is disposed at a height higher than the waist of the seater. You will have to press it hard (as shown by the arrow)
B′), to enhance the aforementioned effects even more.

In the armrest part 7, when the chair 1 is in a stable state, the horizontal shaft 74 contacts the seat rear support frame 6 from above, and this prevents the seat part 2 from tilting forward, so that the seat part remains stable during the sitting operation. is planned. Further, in this state, the armrest portion 75 extends above the seat 2 substantially parallel to the seat 2, and supports the seater's forearm from the elbow in a natural state. When the seated person leans back as described above, the armrest portion 7 operates as follows. The position of the armrest main body 70 is based on the rotation axes 72 and 73.
Although it is determined by the position of
is descending. On the other hand, the rotation axis 73 is the armrest support 7
1, and the armrest support 71 rises when the seater leans back and stands up rearward, and the pivot shaft 73 also rises accordingly. In this way, the armrest main body 70 rotates around the rotation axis 7.
2, 73, and rotates based on both the lowering of the rear part and the raising of the front part, and as a result, the seat part rotates more rapidly rearward than the front and rear support frames 5, 6, respectively. This movement is similar to the movement of the seat portion 2 when the seater leans back. Therefore, by appropriately selecting the positions of the shafts 72, 73, and 74 that contribute to the positioning of the armrest main body, it is possible to rotate the armrest portion 75 while keeping it substantially parallel to the seat portion 2. The illustrated positional relationship shows an example of rotation that maintains the parallelism. When the shaft 72 is moved upward, the shaft 73 is moved backward, and the shaft 74 is moved forward from the illustrated position, each movement acts to make the rotation of the armrest main body 70 more rapid. Movement in the opposite direction acts to make the armrest main body 70 rotate more slowly. The desired rotational state of the armrest portion 75 can be determined based on these relationships. By rotating the armrest portion 75 while keeping it substantially parallel to the seat 2, the seater can lean back while maintaining a natural arm position as shown in FIG. Based on this, the above-mentioned effects can be obtained. The armrest main body 70, the armrest support 71, and the seat front and rear support frames 5 and 6 are rotatably connected to each other by a rotation shaft as in this example, or by a flexible material such as a spring material at the joint. Of course, it may be obtained by interposing a member.

As the chair tilts backward from the stable state, the seat front support frame 5 approaches the seat rear shaft 21, as can be seen from FIG.
1, thereby preventing the seat portion 2 from tilting excessively backward. The position of the lateral visual intersection point A can be determined as appropriate depending on the purpose and dimensions of the chair, but
Normally, in a natural sitting state, that is, a state in which the seat is substantially horizontal or slightly tilted backwards, it is desirable to set the position near a vertical plane that passes through the center of gravity of the sitter and extends in the left-right direction of the chair. 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 a certain type of rocking chair, the lateral visual intersection point A is set forward of the vertical plane when the seat is approximately horizontal. It is desirable to As a result, after sitting down, the seater can easily put his or her feet in the air and swing the chair, with the chair rotated backwards to a stable position. In this way, the lateral visual chiasm point A
The position of will affect chair stability during sitting motion when the lateral visual intersection point A is the instantaneous center of seat rotation and the instantaneous center is within the vertical plane passing through the sitter's center of gravity. This seems to be because the seat is most stable. That is, when the lateral visual chiasm point A is in front of the vertical plane, the seat rotates rearward to move the lateral visual chiasm point A rearward with the sitting movement, and the lateral visual chiasm point A is moved backward. When the 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 positioned farther back below the rear end of the seat. 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 place it at a position approximately directly below the upper end of the backrest portion 3 in a stable state, or approximately 5 cm to 25 cm rearward from the support shaft 31. By doing so, the seater can take a posture in which he or she leans backwards, for example, as shown in FIG. 10, while preventing the chair from falling over, and can easily and freely bend or straighten his or her body. Further, the return action of the chair 1 is stronger as the distance between the front and back axes of the seat and between the front and back axes of the base is larger, and usually the distance is set to be larger than the height of the seat 2 in the vertical plane.

In the above points, the axes of the seat and base parts and the frame extending to connect these axes are shown as being integrated, but it is of course possible to provide each of these separately. . cradle part 22,
Although the base connecting member 42 is made of cloth and chain, it may be made of a highly rigid material. However, the advantage of making it from such flexible material is that it can be folded, and by making the effective length variable, the height and inclination of the seat can be adjusted. Regarding the shape of the backrest in the above example, in addition to the exemplified shape, various shapes suitable for obtaining pressure on the waist or back by leaning backwards of the seater can be adopted, for example,
The backrest plate can be supported by a spring frame so that it can be tilted, or it can be shaped like a pillow with a curved side view. The armrest support 71 may be pivotally supported at its pair of left and right lower end portions to the seat front support frame 5 without being connected by the horizontal shaft 74. In this case, in order to prevent the seat 2 from tilting forward excessively, as shown by the dashed line in FIG. The sexual member 8 can be stretched loosely so that when the patient leans forward to a certain extent, the member 8 becomes tense and prevents further forward leaning.

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 by the seat and base, which allows the seater to change their posture. The chair has a large movable range, and the chair as a whole can be made compact considering the size of the movable range. In addition, the seat and backrest move in different ways,
When the seater leans his or her upper body backward, the seater can experience great pleasure as the lower back and back muscles stretch. 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. The armrest is supported at the front and rear by the seat front support frame and the seat rear support frame, respectively, so that it rotates while remaining substantially parallel to the seat as the seater leans back. This allows the seater to perform the above-mentioned backward tilting motion while relaxing his arms and maintaining a natural arm posture.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention.
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.
6 and 7 are side views schematically showing the swinging state, and FIGS. 8, 9, and 10 are side views showing the use state. 1...Chair, 2...Seat, 3...Backrest,
4...Base part, 5...Seat front support frame, 6
...Seat rear support frame, 7...Armrest, 20
... Seat front shaft, 21 ... Seat rear shaft, 31 ... Support shaft, 32 ... Backrest plate, 40 ... Base rear shaft,
41...Base front shaft, 42...Base connection member,
70... Armrest main body, 71... Armrest support, 7
5...Armrest part.

Claims (1)

[Claims for Utility Model Registration] A seat part, a backrest part, a base part that contacts the installation surface when installed, a front support frame and a rear support frame of the seat part that connect the seat part and the base part, and an armrest part. 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 part includes a base rear shaft that extends in the left-right direction of the chair below the rear end of the seat, a base front shaft that extends in the left-right direction of the chair below the front end of the seat, and these front base shafts and the rear base. a base connecting member that holds the shafts so that they do not separate from each other by more than a certain distance; the seat front support frame extends to connect the seat front shaft and the base rear shaft; The seat rear support frame is rotatably attached to the seat via the front shaft and rotatable relative to the chair installation surface via the base rear shaft, and the seat rear support frame is rotatably attached to the seat rear shaft. and extends so as to connect the front base shaft, is rotatably attached to the seat via the seat rear shaft, and is rotatable relative to the chair installation surface via the base front shaft. , the backrest part has a lower part supported by the seat rear support frame and extends upward, and has a support part for supporting the seater's backward leaning at a position corresponding to a height from the waist to the upper back of the seater. The armrest has an armrest main body whose rear end is rotatably supported by the seat rear support frame around an axis in the left-right direction of the chair and has an armrest portion above the seat; The upper end portion is connected to the armrest body forward of the rear end portion so as to be rotatable around the chair's left-right direction axis, and the lower end portion is connected to the seat front support frame so as to be turnable around the chair's left-right direction axis. A chair comprising an armrest support. 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 height of the waist of the seater. The chair according to claim 1, characterized in that the chair is provided with a backrest plate.