JPH048823Y2 - - 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. It is often desirable to have something that allows you to move your body. Particularly, in addition to freeing up the body when sitting for a long period of time, it is often desirable for the sitter to tilt his/her upper body back from a seated state using his or her own strength for special tasks or body correction. Among such chairs that can be tilted backwards, there are chairs in which the backrest part can be tilted backwards with a spring force, and chairs in which the backrest plate can be rotated around a horizontal axis.

Problems that the invention aims to solve However, with all of these chairs, there was a problem in that only the backrest could move in a monotonous manner, and the chairs could not sufficiently respond to the seater's requirement to lean backwards. .

The purpose of the present invention is to solve the problems of the prior art and to provide a chair that can satisfactorily respond to the request of the seater to lean backwards by his or her own strength.

Means for Solving the Problems The object of the present invention is to provide an upright chair comprising a frame part, a flexible support part stretched over the frame part, a backrest part, and an armrest part. , the frame part has a pair of front frames, each having a rear end in contact with the chair installation surface and extending so as to rise forward and fixed therebetween by a horizontal member, and a front end in contact with the chair installation surface and rising rearward. a pair of rear frames extending from each other and fixed to each other by a horizontal member; and a connecting member connecting the lower ends of the front frame and the rear frame so as not to separate from each other by more than a certain distance, the backrest portion is provided with a back support part that is supported by the rear frame and extends in the left-right direction of the chair at a position corresponding to the height of one of the backs of the seated person, and the front frame and the rear frame are in contact with each other. The rear end portion of the front frame is in contact with the chair installation surface at a position rearward from the back support portion when the seater is at maximum backward tilt, and the flexible support portion has a front end portion fixed to the upper end portions of the pair of front frames, and a rear end portion connected to the vicinity of the back support portion of the pair of rear frames,
When there is no load on the seat and no occupant is present, tension is applied between the front frame and the rear frame to prevent the front frame and the rear frame from falling forward and backward, respectively, and when the occupant is seated, the seat The armrest section is stretched between the front frame and the rear frame so as to bend along the seater's body and support the seater, and the armrest section has a rear end portion that rotates about the axis in the left-right direction of the chair with respect to the rear frame. an armrest main body that is supported by the sitter and has an armrest portion above the seating surface of the flexible support portion when the sitter is seated;
an armrest support whose upper end is rotatably connected to the armrest body forward of the rear end about the chair's lateral axis, and whose lower end is rotatably connected to the front frame about the chair's lateral axis; This is achieved by a reclining chair characterized by the following.

In any of the above cases, the back support portion is a support shaft extending in the left-right direction of the chair, and the backrest portion is rotatably supported around the shaft so that the lower end is at least the height of the waist of the seater. A backrest plate may be provided.

In the flexible support part, the "rear end part is
A state in which the pair of rear frames is coupled to the vicinity of the back support part is a state in which the pair is directly fixed to the rear frame, and a state in which the pair is coupled to the rear frame via the back support part fixed to the back support part. This shall include the state in which

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

The chair 1 shown in the figure has a frame part 2 and a support part 3.
, a backrest portion 4, and an armrest portion 5. The frame portion 2 includes a pair of front frames 20 whose rear ends touch the chair installation surface and extend upwardly toward the front.
, a pair of rear frames 21 whose front ends touch the chair installation surface and extend rearwardly, and a chain which connects the lower ends of the front frame 20 and the rear frame 21 so that they do not separate from each other by more than a certain distance. The connecting member 22 is provided. front frame 20
has horizontal members 200 and 201 at the front and rear ends, respectively.
It is fixed by. The rear frame 21 is fixed at its front end and central portion by horizontal members 210 and 211, respectively. These front frame, rear frame, and horizontal member are made of metal pipes. Backrest part 4
The support shaft 40 is supported by the rear frame 21 at a position corresponding to the height of the center of the back of a person seated on the chair 1 and extends in the left-right direction of the chair;
A backrest plate 41 is rotatably supported at 0 and has a lower end at a position corresponding to the height of the lower back of the seater and an upper end at a position corresponding to the height of the upper back of the seater.
Front frame 20 and rear frame 2 extending at an angle
1, one pair of rear frames 21 have an interval corresponding to the chair width, one pair of front frames 20 has a narrower interval and pass between the rear frames 21, and the two frames do not touch each other. When viewed from the side, they have an intersecting appearance. The front frame 20 and the rear frame 21 swing around their lower ends as described below. In this swing range, the front end of the rear frame 21 is located approximately directly below the front end of the front frame 20, and the front The rear end of the frame 20 is located behind the support shaft 40. The receiving rack section 3 includes a cloth sheet section 30 and a string-like tension section 31. The cloth seat part 30 has a rectangular shape that is long in the front and back direction of the chair, and has a front end sewn to the horizontal member 200 and a rear end part sewn to the rear frame 21 slightly below the support shaft 40 so as to hang between them. It is loosely tensioned. A horizontal member 212 is further installed between the pair of rear frames 21 to support the rear end of the seat portion. The tension section 31 is the seat section 3
0, and the front end is a horizontal member 200,
The front frame 20 and the rear frame 21 are fixed at their rear ends to a horizontal member 211, respectively, as shown in FIG.
The front frame 20 and the rear frame 21 are supported so as not to fall forward and backward, respectively. When sitting in a seated position, the seat portion 30
As shown in FIG. 2, it bends along with the seater and supports the seater in a hammock-like manner.

The armrest portion 5 includes a pair of left and right armrest bodies 50,
It is provided with an armrest support 51 that connects this. Each armrest main body 50 is supported at its rear end by the rear frame 21 via a rotation shaft 52, and supported by the armrest support 51 via a rotation shaft 53 in front thereof. The armrest support 51 is
The lower horizontal shaft 54 is rotatably supported by the front frame 20 by a receiving metal fitting 56, and the upper end portions of the left and right pair are connected to the armrest main body 5 as described above.
Connected to 0. The rotation axes 52, 53 and the horizontal axis 54 both extend in the left-right direction of the chair, and the armrest 5 can rotate in a plane perpendicular to these axes as the chair body swings. ing. As shown in FIG. 2, the armrest main body 50 is arranged so as to extend substantially horizontally above the seating surface when the sitter is seated, and has an armrest portion 55 on its upper surface. In this example, when the chair is in an unloaded state, both left and right ends of the horizontal shaft 54 abut against the rear frame 21 from above, thereby preventing the chair body from tilting forward and making it stable.
A receiver 57 made of a soft material such as rubber is adhered to the abutting portion of the rear frame 21. However, the stability of the chair in an unloaded state is left to the weight balance of the entire chair, and in this state, the horizontal axis 54 is placed in a separated position above the rear frame 21, so that the horizontal axis 54 touches the rear frame 21 when tilting forward after sitting. It may be arranged so that they are in contact with each other.

The chair 1 constructed in this way operates as follows. In an unloaded state when no occupant is present, the front frame 20 and the rear frame 21 are supported at their lower ends by the connecting member 22 and at their upper ends by the tensioning part 31 to prevent them from overturning and from expanding in the vertical direction. Maintain a leaning position. When seated, the seat portion 30 supports the occupant, and the front frame 20 and rear frame 21 are supported by the tension portion 31 to maintain a constant posture at a balanced position with the center of gravity of the occupant. In either case frame 2
0 and 21 are rotatable around horizontal members 201 and 210 at the lower ends, and the support portion 3 is made to swing by, for example, the leg bending and stretching force of the sitting person. This rocking action has the effect of returning the empty chair 1 or the chair 1 and the occupant to a gravitational balance state when seated. This is because the chair lateral visual intersection point A (see FIG. 2) of the frames 20 and 21 becomes the instantaneous center of the swinging of the support section 3, especially the tension section 31, and the rear intersection point A of the chair 1 as it swings. Or, it is thought that this is because the center of gravity of the chair 1 and the seated person moves in a direction away from the stable state and earlier than the center of gravity, causing the moment due to the load to act in the direction of returning to the stable state.
It is supported by the support part 3 and the backrest part 4, and the seater can freely lean backwards by utilizing the rocking motion and the rotation of the backrest plate 41, and can bend significantly backward. Since the distance between the front frame 20 and the rear frame 21 is kept constant by the tensioning part 31, the loose tensioning of the seat part 30 is maintained when the seater is leaning backwards.
Figure 3 shows a person with his or her feet stretched out and running far backwards. Since the rear end of the front frame 20 is located behind the support shaft 40 of the backrest, the chair 1 will not fall even if the seater leans backwards.

In the armrest portion 5, when the seater is in a stable sitting state in which the seater is sitting naturally as shown in FIG. 2, the horizontal shaft 54 is in contact with the rear frame 21 from above,
This prevents the occupant from leaning forward in this manner and during the sitting operation, thereby providing greater stability for the occupant. Further, in this state, the armrest portion 55 extends substantially horizontally above the seat surface of the support portion 3, 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 5 operates as follows. The position of the armrest main body 50 is determined by the positions of the rotation axes 52 and 53, but the position of the rear frame 2 is determined by the backward tilt of the seater.
1 tilts backward, the rotation shaft 52 descends.
On the other hand, the rotation shaft 53 is interlocked with the front frame 20 via the armrest support 51, and the armrest support 51 rises when the seater leans back and stands up backwards.
The rotation shaft 53 also rises accordingly. In this way, the armrest main body 50 rotates based on both the lowering of the rear part and the raising of the front part in response to the rotation axes 52 and 53, and as a result, the armrest main body 50 rotates more rapidly rearward than each of the front frame 20 and the rear frame 21. Rotate toward the target. This movement is similar to the movement of the body when a seated person leans back. Therefore, the shaft 52 contributes to the positioning of the armrest body,
By appropriately selecting the positions of 53 and 54, the armrest portion 55 can be made to rotate in accordance with the degree of backward inclination of the seater. The illustrated positional relationship shows an example of such rotation. Assuming that the shaft 52 is moved upward, the shaft 53 is moved backward, and the shaft 54 is moved forward from the illustrated position,
Each movement acts to make the rotation of the armrest main body 50 more rapid, and movement in the opposite direction acts to make the rotation of the armrest main body more slow.
The desired rotational state of the armrest portion 55 can be determined based on these relationships. By making the armrest portion 55 rotate in accordance with the degree of backward leaning of the seater, the seater can maintain the natural arm position as shown in FIG. 3 and lean back. The above-mentioned effects based on this can be obtained. Armrest body 50,
The rotatable connection between the armrest support 51, the front frame 20, and the rear frame 21 can be achieved not only by a rotation shaft as in this example, but also by interposing a flexible member such as a spring material at the joint. Of course, it is also good.

In order to more reliably prevent the chair from falling backwards and to prevent the chair installation area from becoming too large, the rear end of the front frame 20 is set at a distance of 5 cm or more from the support shaft 40 of the backrest when the chair is tilted most backward. It is desirable that the seat be placed in contact with the chair installation surface at a distance of 25 cm from the rear. By doing this, the seater can, for example, take a posture where the legs are lifted off the floor and arch backwards as shown in Figure 4, while preventing the chair from falling over, allowing the seater to easily and freely arch and stretch the body. can be done. At this time, the front frame 20 comes into contact with a horizontal member 211 installed between the rear frames 21, and further rearward rotation is restrained.

5 and 6 are examples of a chair in which the side edge of the fabric seat portion 30A also serves as the upholstery portion 31A in the receiving rack portion 3A, and the other portions are the same as the example in FIG. 1. It shows. In FIGS. 5 and 6, the same parts as in the example of FIG. 1 are given the same numbers. Since the side edges of the seat surface constituted by the seat portion 30A are stretched by the load when sitting, the flexure along the seater is slightly shallower, but the function and effect of the chair as a whole are the same as in the example shown in Fig. 1. can be obtained. In addition,
The entire width direction of the cloth sheet portion 30A including the side edges of the cloth sheet portion 30A may also serve as the tension portion 31A.

Although the connecting member 22 is made of a chain, it may be made of a material with high rigidity. However, by manufacturing it from such a flexible material, it can be folded, and by making the effective length variable, the height and inclination of the receiving part can be adjusted. In addition to the illustrated example, the backrest can have various shapes suitable for the backward leaning of the seater.For example, the backrest can be shaped like a pillow with a curved side view, or the support of the backrest can be changed between the support plate and the frame. It is also possible to make the tilting possible by interposing a springy material between the two.

The armrest support 51 may be pivoted to the front frame 20 at its pair of left and right lower end portions without being connected by the horizontal shaft 54. In this case, a stopper 6 can be provided as shown by the dashed line in FIGS. 1 and 2 to prevent the receiving rack portion 3 from tilting forward excessively. The stopper 6 is made of a flexible member 60 such as cloth, and its rear end is sewn to the horizontal member 211, and its front end is attached to a rod 61 installed near the upper ends of the pair of front frames 20. It is sewn, and the frame 20,
When 21 rotates forward excessively, it becomes tense and stops further forward rotation. The stopper 6 also functions to limit the degree of opening between the frames 20 and 21 when the seater leans back.

Effects of the Invention As is clear from the above, according to the present invention, it is possible to provide a reclining chair that has the following effects. That is, in the chair according to the present invention, the front frame and the rear frame are supported by the tension part and extend so as not to touch each other and intersect when viewed from the side of the chair, and the flexible seat part forming the seating surface is supported by these frames, so the seater, while supported by the support section and the back support section on the rear frame, rotates each of the frames to take a tilted back posture. As in, it is possible to lean backwards by one's own strength. In addition, since the rear end of the front frame is in contact with the chair installation surface at the rear of the back support part when the seater is tilting back to the maximum, it prevents the chair from tipping over when the seater is leaning backwards, and allows the seater to lean back freely. enable. Furthermore, since the armrests are supported at the front and rear by the front frame and the rear frame, respectively, they can be rotated in accordance with the degree of backward tilt of the seater, allowing the seater to straighten his/her arms. The aforementioned backward tilting motion can be performed comfortably and while maintaining a natural arm posture.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Fig. 1 is a perspective view of the chair, Fig. 2 is a side view of the chair and the sitter in a stable sitting state, and Fig. 3 is a side view of the chair and the sitter when it is tilted backwards. FIG. 4 is a side view of the chair and the seated person when tilted even further back, FIG. 5 is a perspective view of another example of the chair, and FIG. 6 is a side view of the chair and the seated person. 1...Chair, 2...Frame part, 3,3A...
Receiver part, 4...Backrest part, 5...Armrest part, 2
0...Previous frame, 21...Later frame, 22...
...Connection member, 30, 30A...Fabric sheet part, 3
DESCRIPTION OF SYMBOLS 1, 31A...String-like extension part, 50... Armrest main body, 51... Armrest support body, 55... Armrest part.

Claims (1)

[Claims for Utility Model Registration] A reclining chair comprising a frame portion, a flexible support portion stretched over the frame portion, a backrest portion, and an armrest portion, the frame portion comprising: A pair of front frames whose rear ends are in contact with the chair installation surface and extend upward to the front and are fixed between each other by a horizontal member; A pair of rear frames fixed by a directional member, and a connecting member that connects the lower ends of the front frame and the rear frame so as not to separate from each other by more than a certain distance, a back support part that is supported by the rear frame and extends in the left-right direction of the chair at a position corresponding to the height of one of the backs of the chair; The rear end portion of the front frame is in contact with the chair installation surface at a position rearward of the back support portion when the seater is tilting back at its maximum; a seat portion fixed to the upper end portions of a pair of front frames and having a rear end portion fixed near the back support portions of the pair of rear frames to support a seater; 1 fixed to the upper end portions of the pair of front frames and having its rear end connected to the upper half portion of the pair of rear frames to support the front frame and the rear frame so as not to fall forward and backward, respectively;
and a pair of extension parts, the armrest part has a rear end part supported so as to be rotatable about an axis in the left-right direction of the chair with respect to the rear frame, and the flexible support part when the seater is seated. an armrest body having an armrest portion above the seating surface of the
an armrest support whose upper end is rotatably connected to the armrest body forward of the rear end about the chair's lateral axis, and whose lower end is rotatably connected to the front frame about the chair's lateral axis; A reclining chair characterized by comprising: