JP2012223284A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair that reduces a load on the body by allowing the center of gravity shaking in a natural state and by making a seat surface swingable in any direction with the center of gravity transfer even in the occurrence of movement accompanied by the center of gravity transfer in any direction in a posture when sitting on a chair.SOLUTION: The seat 70 constituting the seat surface is suspended by a hanging member 60 on the frame of the chair. The hanging member 60 is connected to one place of a part 40 of the frame situated on both sides upward of the seat 70, the seat is swingably supported in any direction including forward/backward and left/right. Further, on both sides of the seat, there is provided a space for allowing the seat to swing.

Description

  The present invention relates to a chair suitable as an office chair for an office or the like, and more particularly, to a chair that has a seat surface that freely moves relative to a chair body and that is highly comfortable and less tiring when used for a long time.

In order to reduce the burden on the back and back when sitting on a chair for a long time in an office etc., the backrest part is elastically fixed to the main body and the function to move the seat back and forth Office chairs that have been used are widely used.
For example, Patent Document 1 proposes a tilting chair in which the seat portion is separable from the leg portion, and the tilt angle of the seat portion is changed by raising and lowering the seat portion in a certain cycle in front of the seat portion. . Further, Patent Document 2 proposes a chair in which a backrest portion and a seat are integrally connected, and the seat moves forward in conjunction with the backward tilting of the backrest so that the seat is in a rocking state. Further, Patent Document 3 proposes a chair in which a seat surface is suspended on left and right armrests by a hanging tool so as to be swingable.

JP 2003-38283 A JP 2006-239078 A JP 2006-341042 A

  By the way, even if people seem to be stationary, they always keep their balance by moving the center of gravity. Such static center-of-gravity control, that is, center-of-gravity shaking (static center-of-gravity shaking) is indispensable for maintaining a comfortable posture of a person. On the other hand, even when a person performs some kind of movement, the balance is maintained by maintaining the posture by controlling the center of gravity. This is usually referred to as dynamic center of gravity fluctuation.

  However, when a person is seated on a chair, the buttocks are fixed to the seating surface, so it is difficult to maintain a static center-of-gravity state. Also, when you do something while sitting on a chair, for example, when you reach out to a phone that is relatively far away on the desk, or when you try to move a document to or from a side desk, There is a problem that it is difficult to balance in a natural manner and an excessive burden is placed on the back and waist.

  Among the conventional techniques described above, the technique described in Patent Document 1 can alleviate the burden on the waist caused by the fact that the center of gravity is always directly below the waist, but it is a center of gravity movement that is forcibly applied from the outside. For this reason, it is inferior to the natural state of center-of-gravity instability, which may hinder concentrated work for some people. Moreover, the burden of the body caused by the dynamic movement of the center of gravity cannot be solved. With the technique described in Patent Document 2, it is easy to maintain the center of gravity balance with respect to forward and backward movements, but the above problem cannot be solved with respect to center of gravity movements with motion components on the left and right.

  Since the technique described in Patent Document 3 is in a state where the seat surface is suspended, it can achieve a natural center of gravity fluctuation to some extent, and also maintains a center of gravity balance against movement of the body accompanying the movement. Easy to design. However, this technique also considers the movement of the front and rear bodies, but cannot cope with the movement of a body having left and right components.

In addition, as a hanging chair used in leisure or outdoor, a chair in which a saddle-shaped or hammock-shaped hanging chair is hung on a stand is known (for example, Patent Document 4). Such a leisure chair is a hanging chair. The swing range is wide, and a large stand for suspending the hanging chair is required, which is not suitable as an office chair.
JP 2006-341042 A

  The present invention makes it possible to swing the center of gravity in a natural state, and when there is a body movement that changes the center of gravity while sitting on a chair, it can be moved in any direction according to the movement. It is an object of the present invention to provide a chair that can swing a seating surface and reduce a burden on the body.

  The chair of the present invention that solves the above problem is a chair comprising a frame, a seat, and a suspension member for fixing the seat to the frame so as to be swingable. Is provided with a pair of side frame bodies located on both sides of the seat portion and a rear frame body located behind the seat portion, and the seat portion is provided at each one of the pair of side frame bodies. The space is connected to the suspension member and allows the seat portion to swing in the left-right direction in the left-right direction.

  In the present specification, the left-right direction of the person in a state where the person is seated on the chair is defined as the left-right direction of the chair, and the front-back direction of the person is defined as the front-back direction of the chair. The direction perpendicular to the floor on which the chair is placed is the up-down direction.

  In the chair of the present invention, the seat surface is not fixed to the frame body, and the seat surface can swing in any direction including front and rear and left and right, and the seat surface swings according to the movement of the person sitting on the chair. At that time, since the movement of the center of gravity is small, it is possible to reduce the strain on the muscles for maintaining the balance of the center of gravity and the burden on the skeleton. In addition, the center of gravity sway (static center of gravity sway), which is unconsciously performed by humans in a static state, can be realized even when sitting on a chair, and the load is not concentrated on one part of the buttocks. Since it is dispersed, it can maintain a comfortable state even when sitting for a long time.

Overall perspective view of the chair of the first embodiment The perspective view which looked at the chair of a first embodiment from the front side. (A)-(c) is a figure which shows the Example of a suspension member. (A)-(e) is a figure explaining the motion of a seat part. (A)-(c) is a figure explaining the motion of the left-right direction of a seat part. The figure which shows the locking mechanism of the chair of 1st embodiment. Whole perspective view of the chair of the second embodiment Front view of the chair of the second embodiment (A), (b) is a figure which shows the example of a change of the side plate of 2nd embodiment. Overall perspective view of chair of third embodiment Front view of the chair of the third embodiment Overall perspective view of chair of fourth embodiment Front view of the chair of the fourth embodiment Side view of the chair of the fourth embodiment

  Hereinafter, each embodiment of the chair of the present invention will be described with reference to the drawings.

<First embodiment>
The whole perspective view of the chair of this embodiment is shown in FIG. 1, and the figure seen from the front side is shown in FIG.
The chair 10 includes, as main elements, a leg 20, a base 30 supported so as to be movable in the vertical direction with respect to the leg 20, an armrest 40 fixed to both sides of the base 30, and an armrest 40 A backrest portion 50 provided on the rear side and a seat portion 70 supported swingably with respect to the armrest portion 40 by a suspension member 60 connected to the armrest portion 40 are provided. The leg portion 20, the base portion 30, the armrest portion 40, and the backrest portion 50 constitute a frame of the chair.

  The leg portion 20 can be configured in the same manner as a leg portion generally used for an office chair. In the illustrated embodiment, the leg portion 20 is fixed to a vertical support column 21 and a lower end of the support column 21 and is substantially the same. It consists of a plurality of leg members 22 that are spread at an equal angle in the horizontal direction and that are five in the figure. A known lifting mechanism 23 is provided between the upper end of the support column 21 and the base 30, and the height from the floor surface of the base 30 and the armrest 40 fixed to the base 30 can be adjusted. It can be done. A caster 24 is fixed to the tip of the leg member 22 to enable smooth horizontal movement of the chair. Although not shown in the figure, the caster 24 is provided with a stopper that suppresses its rotation, and the chair body can be fixed to the floor surface by the stopper. As a result, the original performance of the chair is exhibited.

  The base 30 is made of a horizontal plate-like member, and is a portion where a seating surface is provided in a normal office chair. In this embodiment, the base 30 functions as a frame that supports the armrest 40. Yes.

  The armrest portion 40 is a somewhat deformed rectangular ring-shaped member, and one side 41 of the upper and lower sides (which is a portion corresponding to one side of the rectangle but is simply referred to as a side here) is formed on the base 30. The other side 43 functions as an armrest. The side 43 serving as an armrest can be made of a material corresponding to the function, and an area necessary for the armrest is secured on the upper surface. The distance between the lower side 41 and the upper side 43 of the ring-shaped member is wider than the distance between the seat surface of the normal chair and the armrest, and between the sides 41 and 43, a seat 70 described later is placed. A space that allows left-right swinging is formed. Further, the length of the lower side 41 (side closer to the seat 70) is formed to be slightly larger than the depth of the seat 70, so that even when the seat 70 swings in an oblique direction, the armrest is It is comprised so that it may not collide with the part 40. FIG. The length of the upper side 43 serving as an armrest may be shorter than the length of the side 41 fixed to the base 30. By adopting such a structure, the overall size of the chair can be made compact in the same way as a normal office chair, and the distance from the desk (not shown) can be appropriately maintained without the armrest portion 40 getting in the way. And free swinging of the seat 70 can be ensured.

  The backrest 50 is attached to the rear of the pair of armrests 40 described above. The backrest part 50 may be fixed so as not to move with respect to the armrest part 40, or may be fixed via a resilient connection part such as a spring (not shown). In the illustrated embodiment, the backrest portion 50 includes a fixed portion 51 fixed to the armrest portion 40 and a movable portion 52 that is elastically fixed to the armrest portion 40. The fixing portion 51 reinforces the strength of the entire frame body by connecting the armrest portion 40. The movable part 52 is preferably made of a cushioning material and has a role of absorbing a human load. A predetermined interval is provided between the fixing portion 51 and the base portion 30 so that the movement of the seat portion 70 is not hindered by the backrest portion 50.

  The seat portion 70 is a member constituting a seat surface on which a person sits, has a width and a depth necessary for the seat surface, and preferably, a cushioning material is used for a portion to become the seat surface. The seat 70 is suspended from the armrest 40 (side 43) 40 by the suspension member 60 and is in a state of floating from the base 30. With the connection point between the armrest 40 and the suspension member 60 as a fulcrum, in any direction, Can swing. As the suspension member 60, various shapes such as a string shape, a rod shape, and a chain shape can be used, and at least the side connected to the armrest portion 40 in order to allow the seat portion 70 to swing in any direction. It is preferable that one end of each is connected to the armrest part 40 at one point.

  Various structures can be adopted as the support structure by the suspension member 60 according to the specific structure and material of the suspension member. FIG. 3 shows several embodiments of the suspension member 60. In FIG. 3, (a) shows the case where the suspension member 60 consists of one rod-shaped member, and the chair shown in FIG.1 and FIG.2 employ | adopts the suspension member of this structure. (B) is a case where one member branches in the middle of the longitudinal direction and has a shape divided into two (inverted Y shape), (c) is a joining of a rod-shaped member and a semicircular plate-shaped member Shows things.

  The connecting means between the suspension member 60 and the armrest portion 40 and the seat portion 70 may employ various known means as long as the suspension member 60 can be rotated in each direction around the connection portion. be able to. As shown in FIG. 3, when a rigid material is used as the suspension member 60, as an example, one end of the suspension member 60 can be formed into a ball shape and can be connected to the armrest 40 by a ball joint. Moreover, the part connected with the seat part 70 can form a through-hole by a ring shape, and can connect it through the through-hole with the fixture attached to the seat part 70 side. The structure of the connection part of the armrest part 40 and the connection part of the seat part 70 may be different, or both may have the same structure. By such connection, the seat part 70 can swing freely with respect to the armrest part 40 both in the front-rear direction and in the left-right direction. In addition, since one end 61 of the suspension member 60 is fixed at one position of the armrest portion 40, the seating surface does not move in parallel in the front-rear direction swing, but is centered on one point (one point). The movement is arcuate.

  In FIG. 4, the mode of the movement of the seat part 70 in a present Example is shown. 4A and 4B show a state where the seat portion 70 swings back and forth, FIG. 4C shows a state where it swings left and right, and FIGS. 4D and 4E show a state where it swings diagonally. In the swinging in the front-rear direction, the seat surface swings in an arc shape centering on the suspension member connecting portion P1 of both armrest portions 40 as described above, as described above. Therefore, for example, when a person sitting on a chair moves the upper body forward by an action such as reaching out forward, the seat surface moves backward. Since the position (height) of the center of gravity of the person sitting on the chair is higher than the seating surface and near the position (height) of the suspension member connection point of the armrest, the position of the center of gravity when the seating surface moves in an arc shape is Almost unchanged, it can reduce the unreasonable posture to balance and the burden on the body.

  The same applies to the left-right direction, but with respect to the swinging in the left-right direction, the movement of the seating surface is a parallel movement or a movement close to a parallel movement. As shown, the distance between the suspension member connection points P1 and P1, but hereinafter, the distance is omitted and referred to as the distance L1 between the armrest portions 40) and the width in the left-right direction of the seat portion 70 (more strictly speaking, on both sides) The distance between the suspension member connection points P2 and P2 is slightly different depending on the relationship between the suspension member connection points P2 and P2, and hereinafter referred to as the width L2 of the seat portion 70). For example, as shown in FIG. 5 (a), when the distance L1 between the armrests 40 and the width L2 of the seat 70 are equal, the seat surface 71 swings while keeping parallel to the left-right direction. As shown in FIG. 5B, when L1> L2, and when L1 <L2, as shown in FIG. 5C, the seating surface has an inclination, and when L1> L2, the seating surface is lowered to the swinging side. When <L2, the seating surface rises on the swinging side. Since the perception that a person receives depending on this inclination varies depending on the person, it is not possible to generally determine superiority or inferiority, but from the viewpoint of the stability of the center of gravity, the case of FIG. There are few people and it is preferable because a person has a stable feeling. On the other hand, in the case of FIG. 5B, the inclination works in a direction that helps the movement of the center of gravity associated with the movement of the person, so it is suitable for work that frequently involves the movement of the upper body while sitting on the chair. is there.

  As mentioned above, although the chair of 1st embodiment of this invention was demonstrated with reference to FIG.1 and FIG.2, this embodiment is not limited to what is shown in FIG.1 and FIG.2, About each element and connection structure Various changes are possible.

  For example, FIG. 1 and FIG. 2 show the case where the suspension member 60 is composed of one rod-like member. However, as shown in FIG. 3B, one end side is divided into two or more rods. 3 may be used, or as shown in FIG. 3 (c), a plate is formed, and several lower ends of the plate are connected to the seat portion 70 via a ring-shaped member. Also good. Note that the stability of the posture of the seat portion 70 differs depending on the number of connected portions on the side of the seat portion 70 or a plurality of connected portions. For example, when connected at one place, the seat 70 is greatly inclined due to a small movement of the center of gravity in the front-rear direction, and the posture becomes unstable. However, when connected at two or more places, In the movement of the center of gravity within the range of the connection position, the seat portion 70 does not tilt, and the posture becomes more stable as the distance between the connection positions at both ends thereof increases. Therefore, what is necessary is just to select the suspension member 60 suitably according to the sense and design of the person who uses it. In the embodiment shown in FIGS. 1 and 2, the base 30 is located below the seat 70, so that even if the suspension member is connected at one place above and below, a large inclination of the seat 70 due to the movement of the center of gravity is prevented. Is done.

  In FIG. 3, a rigid structure is shown as the suspension member 60. However, the suspension member is made of a flexible material such as a rope or a chain as long as it has a strength capable of supporting the weight of a person. It is also possible to configure. When such a material is used, the connection to the armrest portion 40 and the seat portion 70 has a degree of freedom in the shape of the hanging member itself. Therefore, simply pass a rope through a hole formed in the connection portion, and tie a knot. Various structures can also be employed for the connection structure, such as making and fixing, and fixing the rope to the seat by sandwiching the rope from the top and bottom with two plates constituting the seat. In addition, the distance between the armrest 40 and the seat 70 can be easily adjusted by changing the length of the rope or the like.

  Further, a mechanism for locking the swing of the seat portion 70 may be provided. As the lock mechanism, for example, as shown in FIG. 6, a lock member 75 is connected to both sides of the base portion 30 with a hinge 76 and an engagement hole 77 with which the lock member 75 is engaged is provided in the seat portion 70. it can. When fixing the seat portion 70, the lock member 75 is rotated around the hinge 76 and the free end side is fitted into the engagement hole 77. Further, the locked state can be released by rotating the lock member 75 around the hinge 76. By providing such a lock mechanism, the seat surface can be fixed to the main body, and the stability at the time of sitting can be improved. The locking mechanism is not limited to that shown in the figure, and any fixing means for fixing the seat 70 to the frame body may be used, and means for locking the free rotation of the suspension member 60 with respect to the armrest 40 may be employed. .

  According to the present embodiment, the seat is structured to support the armrest at one position on each of the left and right sides, and the space around the seat in the horizontal direction is provided so that the seat can move substantially in parallel. The part is swingable in any direction with respect to other structures and the floor surface, that is, in a floating state, so that the center of gravity always moves slightly to balance the static state. Along with being able to achieve a static sway of the center of gravity, the position of the center of gravity has shifted significantly from just above the seat (center) by riding forward or twisting the body while sitting in a chair. Even in this case, the center of gravity can always be kept within a certain range (range of static oscillation) by the seat portion swinging in the direction opposite to the direction of the deviation. Therefore, it is possible to reduce the burden on the body by performing such an operation and to continue working in a comfortable state for a long time.

  Further, according to the present embodiment, the lower side of the armrest portion is positioned below the seat portion, and the length thereof is longer than the depth direction of the seat portion, so that the same compact shape as that of a conventional office chair is obtained. It is possible to swing the seat portion in the left-right direction and the oblique direction while maintaining the above.

<Second embodiment>
An overall perspective view of the chair of this embodiment is shown in FIG. 7, and a front view is shown in FIG. The chair of the present embodiment is a chair assembled with plate materials, and a suspension member between a pair of side plates 81, three horizontal plates 82, 83, and 84 that connect these side plates 81, and both side plates 81. And a seat portion (seat plate) 70 suspended by 60.

  The side plate 81 has a substantially trapezoidal shape, and is a frame that serves as both a leg portion and a side portion of the chair. The horizontal plates 82 to 84 that connect the side plates 81 have a width in the left-right direction that increases in order, whereby the side plate 81 has a shape that is not parallel to the surface direction but extends toward the bottom. Thus, when the seat plate 70 is suspended above the side plate 81, a space is created between the seat plate 70 and the side plate 81, and the seat plate 70 can be swung in the left-right direction.

  The horizontal plate 82 provided at the uppermost part is fixed to the side plate 81 so that the plate surface direction is substantially vertical, and functions as a backrest portion. By adopting a fixing method in which the horizontal plate 82 is fixed to the side plate 81 so as to be rotatable around an axis, the angle of the backrest portion can be adjusted. Or when it fixes so that rotation is possible, it can be rotated according to the angle when a person leans. Of the two horizontal plates provided below the seat plate 70, one (the horizontal plate 83) has a plate surface fixed substantially horizontally, and can serve as a footrest as well as reinforcing the structure. A space between the horizontal plates 82 and 84 is a space when the seat plate 70 swings back and forth.

  The suspension member 60 and the connection structure thereof can be the same as those in the first embodiment, but in the illustrated embodiment, a rope is used. On the other hand, holes are formed in two places on both sides of the seat plate 70, and both ends of one rope are separately passed from the bottom to the top of the different holes, and the upper portions of the holes are gathered together. A book is fixed to the side plate 81. The fixing may be a screw stop, or the hook end fixed to the side plate 81 may be hooked with the end of the rope in a ring shape. In the figure, each side plate 81 is shown with one suspension member connection point (hole) formed, but two or more holes are formed at different positions (for example, height), and the center of oscillation is shown. It is also possible to adjust the position of the suspension member connection point, which is a point.

  Also in the chair of this embodiment, as in the first embodiment, the seat plate 70 can swing in any direction with respect to the side plate 81 and the horizontal plates 82 to 83 that are frames, An effect can be obtained. In addition, the chair of this embodiment can be used as an assembling chair that a user assembles because the main structure is composed of only a plate material and the number of parts is small. Furthermore, the chair of the present embodiment is configured such that the seat portion is suspended by the side plate 81, so that the position to be suspended can be adjusted within the range of the height of the side plate 81, and the seat can be adjusted at a position suitable for the user. The surface can be swung.

The present embodiment is not limited to the illustrated one, and various modifications can be made to individual elements without departing from the spirit of the present invention. For example, although a case where a flat plate material is used as the side plate 81 is shown, as shown in FIG. 9A, a large opening for allowing the seat plate 70 to swing in the left-right direction is provided. Alternatively, as shown in FIG. 9B, it is also possible to use a plate material having a curved surface or a stepped portion that widens the distance between the side surface plates 81 as it goes downward. Furthermore, it is also possible to provide an armrest on the side plate 81 as long as the swing of the seat plate 70 is not hindered.
Further, by adjusting the width of the seat 70 and the distance between the side plates 81, the relationship between the distance between the upper ends of the suspension member (L1 in FIG. 5) and the distance between the lower ends (L2 in FIG. 5) As shown in FIGS. 5A to 5C, it may be appropriately changed according to the preference of the user.
Further, similarly to the first embodiment, it is possible to provide a mechanism for fixing the seat portion 70 to the side plate 81 and locking the swinging of the seat portion 70, thereby improving the stability at the time of sitting. it can.

<Third embodiment>
An overall perspective view of the chair of this embodiment is shown in FIG. 10, and a front view is shown in FIG. The chair of this embodiment is suspended from the frame body 80 in which the leg portion and the backrest portion are integrally formed, the armrest portion 40 fixed to the frame body 80 so that the position in the vertical direction can be adjusted, and the armrest portion 40. The seat portion 70 is suspended by a member 60.

  The frame body 80 is a bulk-shaped member, and has a structure in which the bottom surface abuts on the floor and supports the whole with the bottom surface. The portions that are substantially perpendicular to the bottom surface constitute the backrest portion 80a, and the portions that extend forward from both ends below the backrest portion 81 constitute the leg portions 80b. A backrest member 80c having a cushioning property is fixed above the backrest portion 80a and in a range corresponding to the neck of a person sitting on the seat 70 from the shoulder. A mechanism for supporting the armrest portion 40 so as to be movable in the vertical direction is formed on both side surfaces of the backrest portion 80a. As such a mechanism, for example, a pin provided on the armrest portion 40 side is a vertically long groove (hole) in which the pin is slidably engaged, and the pin is engaged and fixed at a plurality of positions in the vertical direction. A well-known mechanism such as one provided with a recessed portion or a combination of a pinion and a rack can be employed.

  The armrest portion 40 is made of an arm-shaped member, and is supported so that the position with respect to the backrest portion 80a can be adjusted as described above. A mechanism for connecting the suspension member 60 is provided slightly forward from the longitudinal center of the armrest 40. As the coupling mechanism, a mechanism similar to that of the first embodiment or the second embodiment can be adopted. However, in the illustrated example, a ball joint (not shown) is used. That is, the end of the suspension member 60 is formed in a ball shape, and a ball bearing is formed inside the lower surface of the armrest portion 40. As a result, the suspension member 60 can swing in any direction.

The side surface of the seat portion 70 is connected to the lower end portions of the two left and right suspension members 60, and in this state, the seat portion 70 has a space between the rear end portion of the seat portion 70 and the backrest portion 80 a of the frame body 80. A gap is formed to allow backward swinging. As a result, it is kept floating from the frame body 80 and can swing in any of the front-rear, left-right, and diagonal directions.
Accordingly, in this embodiment as well, as in the first and second embodiments, even when various operations are performed while sitting on a chair, there is little movement of the center of gravity and muscle tension to maintain the center of gravity balance. Can be reduced and a comfortable state can be maintained.

  In addition, also about the chair of this embodiment, the material of the suspension member 60 and the connection structure of the suspension member 60, the frame body 80, and the seat part 70 are not limited to the Example shown in figure, A various change is possible. is there. Also, the shape of the frame body 80 can be variously changed in consideration of the design and material as long as it does not hinder the swinging of the seat portion 70. Furthermore, it is possible to provide a mechanism for locking the swing of the seat portion 70.

<Fourth embodiment>
An overall perspective view of the chair of this embodiment is shown in FIG. 12, and a front view and a side view are shown in FIGS. 13 and 14, respectively. The chair according to the present embodiment includes a pair of frames 90 that serve as armrests and legs, a rear plate 91 that couples the pair of frames 90, and a pair of frames 90, with a suspension member 60. It is comprised from the suspended seat part 70. FIG.

  The frame 90 is a ring-shaped member made of a metal pipe or the like, and has a height at which a person's elbow can be placed when the person sits down on the seat 70, and a rod-like portion is in contact with the floor. The member 92 is fixed. Although not shown in the drawing, an elbow rest or the like having a shape that makes it easy to place an elbow may be attached to a portion on which the elbow of the frame body 90 is placed, that is, an upper surface serving as an armrest.

  The rear plate 91 has a shape like a partial cylinder obtained by cutting a cylinder having the same radius as the ring-shaped frame 90 along its axis, and connects the frame bodies 90 on both sides. Note that the rear plate 91 is not configured by a single plate, but may be configured by a plurality of thin plates, pipes, or a combination thereof. Further, although the rear plate 91 can function as a backrest portion itself, in the illustrated embodiment, another backrest portion 95 is detachably fixed to the rear plate 91. In the example shown in FIG. 14, the backrest portion 95 has an insertion portion 96 for fixing to the rear plate 91, and the rear plate 91 is inserted by inserting this insertion portion into a pocket 97 fixed to the back surface of the rear plate 91. It can be detachably fixed to the head. The backrest portion 95 is pivotally supported at the upper end of the insertion portion 96, and is configured so that the angle with respect to the insertion portion 96 can be freely changed. Thereby, when a person leans against a backrest part, it can contact | abut to a person's back at an angle according to a person's posture.

  A ring-shaped suspension member fixture 63 is fixed to the uppermost portion of the inner peripheral surface of the ring-shaped frame 90, and the seat portion 70 is attached to the fixture 63 by the suspension member 60. In the illustrated example, the suspension member 60 has a shape as shown in FIG. 3 (b), one end 61 of the inverted Y-shaped member is connected to the fixture 63, and the other end divided into two is seated. It is connected to the part 70.

Also in this embodiment, the same effects as those of the first and second embodiments can be obtained. Further, in this embodiment, the frame that is the main structure is composed of a ring-shaped member. Lightweight and free.
Also in the present embodiment, the shapes of the frame body 90 and the rear plate 91 can be freely changed in consideration of design and structural enhancement within a range that does not hinder the swinging of the seat portion 70. It is also possible to provide a mechanism for locking the swing of the seat portion 70.

  As mentioned above, although each embodiment of the chair of this invention was described, it is possible to change a material, a size, the structure of a junction part, a design, etc., without being limited to these embodiments.

  The chair of the present invention is particularly suitable as an office chair used in an office, but the chair of the present invention can also be used as a chair for a cafeteria or a library.

DESCRIPTION OF SYMBOLS 10 ... Chair, 20 ... Leg part, 30 ... Base part, 40 ... Armrest part, 50 ... Backrest part, 60 ... Suspension member, 70 ... Seat part, 80, 90 ... Frame

Claims (6)

A chair comprising a frame, a seat, and a suspension member for swingably fixing the seat to the frame,
The frame includes a pair of side frames positioned on both sides of the seat, and a rear frame positioned behind the seat,
The seat portion is connected to the suspension member at each one of the pair of side frame bodies, and has a space that allows the seat portion to swing in the left-right direction in the left-right direction. Characteristic chair. The chair according to claim 1,
The side frame is a ring-shaped member, and the space allowing the swing of the seat is a space surrounded by the ring-shaped member. The chair according to claim 1,
The side frame is a plate-like member, and has a space allowing the swing of the seat between the side of the seat. The chair according to claim 1,
The side frame is an arm-shaped member fixed to both sides of the rear frame. The chair according to any one of claims 1 to 4,
The distance between the connection points where the suspension members are connected to each side frame and the distance between the connection points where the suspension members are connected on both sides of the seat portion are different. . A chair according to any one of claims 1 to 5,
Furthermore, the chair provided with the mechanism which adjusts the distance of the connection point of the said suspension member in the said side part frame, and the connection point in the said seat part.

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