JP2016120124A - Rotational mechanism of chair and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply resistance to rotational turning of a member constituting a chair such as a seat without using a structure of exhibiting friction resistance by clamping of a screw.SOLUTION: A rotational mechanism of a chair includes: a seat frame 11 as a rotational member; a rotational shaft 4a as a rotational support part for rotationally supporting the seat frame 11; and a resistance member 18 disposed on a peripheral surface of the rotational shaft 4a, interposed between the rotational shaft 4a and the seat frame 11, and applying frictional resistance to the rotational turning of the seat frame 11.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a rotation mechanism for members constituting a chair. More specifically, the present invention relates to a rotation mechanism suitable for application to, for example, a seat for a conference or office chair.

  2. Description of the Related Art Conventionally, there is a chair capable of jumping up from a horizontal use position to a storage position where the chair seat is raised. Specifically, for example, as shown in FIGS. 13 and 14, a seat of a seat 101 including a seat frame 102 formed in a square shape with a metal pipe and a synthetic resin seat plate 103 fixed to the seat frame 102. The rear portion of the frame 102 is connected to a bearing 105 provided on the upper end portion of the front leg 104 by a bolt 106, and the seat 101 can be swung up and rotated around the bolt 106 as shown by a one-dot chain line in FIG. In such a chair, a bolt 106 that passes through the through hole 102a at the rear of the seat frame 102 is screwed into the bearing 105 in a state in which a braking member 107 made of synthetic resin that provides resistance to the rotation of the seat 101 is fitted. (Patent Document 1).

JP 2003-235670 A

  However, in the technique described in Patent Document 1, the seat frame 102 is adjusted by appropriately adjusting the strength (in other words, bolt tightening torque) for fastening the bolt 106 that fastens the seat frame 102 and the front leg 104 (bearing 105). Therefore, when the bolt 106 is loosened, the frictional resistance is reduced and the seat 101 can be easily rotated. Thus, it is possible that the seat 101 standing upright and being in a vertical posture may fall unexpectedly even though the user does not intend to do so, and the comfort of use of the chair including the rotation of the seat 101 is impaired. There is a problem that it ends up. In addition, when the seat 101 that stands upright and falls down unexpectedly, there is a problem that there is a risk that a finger may be caught between the front leg 104 and the seat 101.

  Accordingly, the present invention provides a rotation mechanism for a member constituting a chair, which can provide resistance to the rotation of a member constituting a chair such as a seat without using a structure that exerts frictional resistance by tightening a screw. The purpose is to provide.

  In order to achieve such an object, the pivot mechanism of the chair of the present invention includes a pivot member, a pivot support portion that pivotally supports the pivot member, and a circumferential surface of the pivot support portion. Or disposed at a position opposite to the peripheral surface of the rotation support portion of the rotation member, and interposed between the rotation support portion and the rotation member so as to be friction resistant against the rotation of the rotation member. And a resistance member for imparting.

  Therefore, according to this pivot mechanism of the chair, the pivot member can be pivoted by the resistance member disposed on the peripheral surface of the pivot support portion or the portion of the pivot member facing the peripheral surface of the pivot support portion. Friction resistance is imparted to the wheel, and resistance is imparted to the rotation of the chair seat and the like without using a structure that exerts the frictional resistance by tightening the screw.

  In the chair turning mechanism of the present invention, the resistance member may be an O-ring. In this case, since the magnitude of the frictional resistance can be adjusted by adjusting the number of installed O-rings, this is a mechanism for imparting frictional resistance to the rotation of the members constituting the chair. A mechanism in which the frictional resistance can be easily adjusted is configured relatively simply.

  In the chair turning mechanism according to the present invention, the turning member is a seat frame and the turning support portion is a turning shaft provided on the support body of the seat. It may have at least one of an upper flange and a lower flange projecting sideways, and the resistance member may be in contact with at least one of the lower surface of the upper flange and the upper surface of the lower flange. In this case, a mechanism for imparting frictional resistance to the rotation of the members constituting the chair is relatively simple.

  Moreover, the chair of this invention is provided with the above-mentioned rotation mechanism. In this case, a chair in which the action of the above-described rotation mechanism is achieved is realized.

  According to the chair turning mechanism of the present invention and the chair provided with this turning mechanism, resistance can be imparted to the turning of the chair seat and the like without using a structure that exerts frictional resistance by tightening screws. The loosening of the screw tightens to reduce the frictional resistance and the seat can be easily rotated to prevent the seat in the vertical posture from falling unexpectedly even though it is not intended by the user. It is possible to improve the comfort of use of the chair including the rotation of the seat.

  When the resistance member is an O-ring, the chair rotation mechanism of the present invention and the chair provided with this rotation mechanism are used to impart frictional resistance to the rotation of the members constituting the chair. Since the mechanism in which the frictional resistance can be easily adjusted can be configured relatively simply, it is possible to improve the versatility of the chair turning mechanism.

  In the chair turning mechanism of the present invention and the chair provided with this turning mechanism, the resistance member is in contact with at least one of the upper and lower surfaces of the upper and lower flanges of the seat frame as the turning member. Since a mechanism for imparting frictional resistance to the rotation of the members constituting the chair can be configured relatively simply, it is possible to improve versatility as a chair rotation mechanism become.

It is a figure showing the front and side which show the whole structure of the chair of embodiment. It is a side view which shows the whole structure of the chair of embodiment. It is a perspective view which shows an example of the structure relevant to the rotation mechanism of the chair of this invention. It is a figure of the state which removed the cushion from FIG. 3 (in other words, when the cushion of FIG. 3 is made transparent). FIG. 5 is a diagram in a state where the shell is removed from FIG. 4 (in other words, when the shell of FIG. 4 is made transparent). FIG. 6 is a diagram in a state in which the seat frame and the elastic member are removed from FIG. 5 (in other words, when the seat frame and the elastic member in FIG. 5 are made transparent). FIG. 7 is a diagram in a state in which the seat back cover is removed from FIG. 6 (in other words, when the seat back cover in FIG. 6 is made transparent). It is a figure of the seat frame in an embodiment. (A) is a side view. (B) is a figure showing a side surface and a plane. It is a partially expanded longitudinal cross-sectional view of the rotation mechanism of the chair of embodiment. It is a partial expansion perspective view of the rotation mechanism of the chair of an embodiment. (A) is the figure which displayed all the members in the impervious state. (B) is the figure which displayed the seat frame of (A) in the transparent state. It is a longitudinal cross-sectional view of the other example of the structure put together by the rotation mechanism of a chair. It is a longitudinal cross-sectional view of the further another example of the structure put together by the rotation mechanism of a chair. It is a figure which shows the chair provided with the raising mechanism of the seat of the conventional chair. (A) is a side view. (B) is the front view of the state which raised the seat. It is a partially expanded view which shows the conventional raising mechanism of the chair seat. (A) is a separated sectional view. (B) is sectional drawing of the assembled state.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  1 to 12 show an example of an embodiment of a chair turning mechanism of the present invention. In the present specification, vertical, front-rear, and left-right are defined with reference to a seated person sitting on a chair seat, and particularly with respect to a seat when the seat is in a horizontal position. In addition to the state that the seat is in a horizontal position, it includes a state in which the seat surface is almost horizontal, and in addition to the state that the seat surface is in a vertical position, in addition to the state in which the seat surface is accurately vertical. Includes a state that is roughly vertical.

  In the present embodiment, a case where the chair turning mechanism of the present invention is applied to the chair 1 whose overall configuration is shown in FIGS. 1 and 2 will be described as an example.

  The chair 1 of this embodiment includes a support body 2, a seat 10 and a backrest 7 that are supported by the support body 2.

  The support body 2 includes a pair of front leg frames 3 and 3 that are arranged opposite to each other on the left and right sides, and a pair of sides that are arranged on the left and right sides of the pair of left and right front leg frames 3 and 3 so as to face each other. A pair of left and right side leg frames 4 and 4; a pair of left and right side leg frames 4 and 4; 4 and 4 and a horizontal frame 6 that is installed in the left-right direction.

  The front leg frame 3 and the side leg frame 4 are integrally formed by bending a single metal pipe material, specifically, a pipe material such as steel, stainless steel, or aluminum alloy into a generally square shape. Configured. The front leg frame 3 is disposed on the front side, and the side leg frame 4 is disposed on the rear side, and the front leg frame 3 is inclined forward and downward and the side leg frame 4 is disposed horizontally.

  In the middle position in the front-rear direction of each of the pair of left and right side leg frames 4, 4, toward the side leg frame 4 on the opposite side (in other words, on the other side when viewed from one side), that is, toward the inner side of the chair 1 A protruding rotating shaft 4a is provided.

  The rotation shafts 4a, 4a of the pair of left and right side leg frames 4, 4 are provided so as to face each other in the left-right direction. That is, the axial center direction of the rotation shaft 4a is the left-right direction, and the shaft centers of the pair of left and right rotation shafts 4a, 4a are coaxial. The rotating shaft 4a is joined to the peripheral surface of the side leg frame 4 by welding or the like.

  The rear leg frame 5 is made of, for example, a single metal pipe material made of the same material as the front leg frame 3 and the side leg frame 4 described above, and is disposed so as to be inclined rearward and downward in the front-rear direction.

  The rear end of the side leg frame 4 and the rear leg frame 5 are joined together by welding or the like at a position above the middle in the vertical direction of the rear leg frame 5.

  In the present embodiment, a caster 9A is attached to the lower end portion of the front leg frame 3, and a caster 9B is attached to the lower end portion of the rear leg frame 5. However, it is not essential in the present invention that the caster is attached to the leg frame.

  Here, in the present embodiment, the front leg frame 3 and the side leg frame 4 that are integrally formed as being continuous are the distance in the left-right direction between the rear ends of the left and right side leg frames 4, 4 (in other words, The distance between the left and right front leg frames 3 and 3 in the left and right direction is narrower than the distance between the left and right rear leg frames 5 and 5 in the left and right direction. Specifically, when the plurality of chairs 1 are arranged in the front-rear direction in the horizontal direction, the left and right front leg frames 3, 3 of the rear chair 1 are between the left and right rear leg frames 5, 5 of the front chair 1. From between the left and right side leg frames 4 and 4 and adjusted so that the plurality of chairs 1 can be stacked in the horizontal and front-rear directions.

  The horizontal frame 6 includes, for example, a single metal pipe material similar to the above-described frames 3, 4, and 5, and includes inclined portions 6 a and 6 a on both the left and right sides and an intermediate portion horizontal portion 6 b sandwiched between them. It is formed by being bent continuously.

  The horizontal frame 6 is arranged between the pair of left and right side leg frames 4, 4 so as to be in the left-right direction in plan view, so that the horizontal portion 6 b of the middle portion is recessed downward, and the seat 10 It arrange | positions so that the unevenness | corrugation (namely, curved surface shape) of a lower surface may be followed.

  The left and right ends of the horizontal frame 6 connect the pair of left and right side leg frames 4 and 4 at positions near the front ends of the pair of left and right side leg frames 4 and 4 (that is, positions near the front leg frame 3). So that they are joined together by welding or the like. The horizontal frame 6 is disposed at a position ahead of the pivot shaft 4 a provided on the side leg frame 4.

  The backrest 7 is made of a resin plate, and the intermediate portion in the left-right direction is bent backward and bent in a plan view, and the portion slightly below the center in the vertical direction is convex forward in a side view. It is formed in a curved shape.

  The backrest 7 has a pair of attachment portions 7a and 7a formed in a cylindrical shape having an opening at the lower end at the lower end portions on both the left and right sides. The backrest 7 is attached to the support 2 by fitting each of the pair of left and right attachment portions 7a, 7a to the upper end portions of the pair of left and right rear leg frames 5, 5. Note that the attachment portion 7a of the backrest 7 and the upper end portion of the rear leg frame 5 are bonded in advance with the upper end portion of the rear leg frame 5 inserted into the attachment portion 7a through the lower end opening. They are fixed to each other by agents and screws.

  The seat 10 includes a seat frame 11, a shell 13 (also referred to as an inner shell or an inner member) attached to the upper surface of the seat frame 11, an elastic member 12 disposed below the shell 13, and an upper surface of the shell 13. And a seat back cover 15 attached to the lower surface of the seat frame 11.

  The seat frame 11 is made of a single metal material, specifically, a bar / plate material such as steel, stainless steel, or aluminum alloy, or various shapes, such as the front frame 11A, the left and right side frames 11B, 11B, and the rear frame. 11C and bent into a generally rectangular shape.

  Through holes 11d and 11d penetrating in the left-right direction are provided at positions behind the middle in the front-rear direction of the left and right side frames 11B, 11B of the seat frame 11 so as to face each other in the left-right direction.

  Then, the rotation shafts 4a and 4a provided in the pair of left and right side leg frames 4 and 4 are inserted into the pair of left and right through holes 11d and 11d, respectively.

  As a result, the seat 10 including the seat frame 11 is in a horizontal posture (FIGS. 1 to 3) with respect to the support body 2 and a posture (in other words, a vertical posture) in which the seat 10 is raised up along the backrest 7. It is mounted so as to rotate between the two. That is, the seat frame 11 rotates with respect to the support 2 with the pivot shaft 4a as a pivot support portion and the seat frame 11 as a pivot member.

  The seat 10 is in a horizontal posture when used for sitting by a seated person, and is in a vertical posture when the plurality of chairs 1 are stacked in the horizontal and front-rear directions.

  The shell 13 is formed of a resin material so as to have a thickness that allows at least a central portion to bend and deform, and is fixed to the upper surface of the seat frame 11 by, for example, screwing or the like. Although the shell 13 is generally formed in a plate shape as a whole, the shell 13 may be curved, may have a different thickness depending on a portion, or may have partial unevenness. Further, the shape of the shell 13 in plan view is not limited to a specific shape.

  In the present embodiment, the shell 13 is provided with a structure that promotes bending deformation.

  The structure for promoting the bending deformation of the shell 13 is not limited to a specific mode. Specifically, for example, a linear slit formed through the shell 13 in the vertical direction as in the present embodiment. 13a, a through hole such as a circle, an ellipse, a square, or a rectangle formed through the shell 13 in the vertical direction, or a linear shape formed in at least one of the upper surface side and the lower surface side of the shell 13 And a concave portion such as a perfect circle, an ellipse, a square, or a rectangle formed on at least one of the upper surface side and the lower surface side of the shell 13.

  Further, when a linear slit 13a or a groove as a linear recess is provided as a structure for promoting the bending deformation of the shell 13, the direction of the slit 13a or the groove is the front-rear direction, the left-right direction, or the front-rear left-right direction. Any of the directions inclined with respect to the angle may be used. Moreover, when a through-hole or a recessed part is provided as a structure that promotes the bending deformation of the shell 13, a variety of formation patterns / arrangement patterns of the through-hole or recessed part can be appropriately selected.

  It should be noted that one structure or a plurality of structures that promote the bending deformation of the shell 13 may be provided for the shell 13.

  The elastic member 12 exhibits an elastic force in the vertical direction against the bending deformation of the shell 13.

  In this embodiment, the shell 13 is attached to the upper surface of the seat frame 11 so that the seat frame 11 and the shell 13 are arranged in parallel, and both end portions (specifically, the elastic member 12 are disposed on the seat frame 11. The front end portion and the rear end portion) are supported, so that the elastic member 12 is disposed along the lower surface of the shell 13 below the shell 13.

  That is, both ends of the elastic member 12 are supported in the direction of the shell 13 as a whole, and are stretched along the direction of the shell 13 as a whole.

  The elastic member is not limited to a specific one as long as it can exert an elastic force in the vertical direction in a state of being disposed along the direction of the shell 13 as a whole.

  In the present embodiment, specifically, an S-shaped spring (also referred to as an S spring or the like) is used as the elastic member 12. The S-shaped spring as the elastic member 12 of the present embodiment is arranged by arranging two S-shaped springs having a longitudinal direction in the front-rear direction, and the front end portions thereof are attached to the front frame 11A of the seat frame 11. At the same time, the rear end portion is attached to the rear frame 11C of the seat frame 11.

  The number of elastic members 12 is not limited to two, but may be one, or three or more.

  Further, the orientation of the elastic member 12 is not limited to the orientation in which the longitudinal direction is the front-rear direction, and may be the orientation in which the longitudinal direction is the left-right direction. Further, when a plurality of elastic members 12 are arranged, the configuration is not limited to a mode in which the plurality of elastic members 12 are arranged in parallel to each other, and the mutual distances change in the longitudinal direction, that is, parallel to each other. It may be arranged so that it is not.

  As described above, the seat 10 is constituted by the double structure of different types of elastic members, that is, the shell 13 and the elastic member 12, thereby realizing a high-grade sitting comfort as a seat when seated, Specifically, when the shell 13 is deformed while being supported by the reaction force due to the deformation of the elastic member 12, the occurrence of a bottomed feeling is prevented, and a sufficiently large amount of bending deformation is realized and secured when seated. Comfort is improved.

  The seat 10 is constituted by the double structure of the shell 13 and the elastic member 12, and the strength is improved and the occurrence of sag is prevented as compared with the case where the seat is constituted only by the shell. Sufficient strength is ensured, durability is improved, and a comfortable sitting comfort is maintained.

  The cushion 14 is provided on the upper surface of the shell 13 for improving the comfort by exhibiting elasticity as a seating surface when seated on the seat 10.

  Specifically, the cushion 14 includes a core material made of a material having elasticity such as urethane and an outer fabric covering at least an upper surface and a side surface of the core material.

  The cushion 14 is fixed while being placed on the upper surface of the shell 13. The method of attaching and fixing the cushion 14 to the shell 13 is not limited to a specific method, and specifically, for example, the core material and the shell 13 in a state where the core material is placed on the upper surface of the shell 13. The outer edge may be disposed so that the peripheral edge wraps around the side edge of the shell 13 and the peripheral edge wraps around the lower surface of the shell 13, and the peripheral edge may be attached to the shell 13 by tightening the string. The parts for use may be appropriately used and attached by screwing or the like.

  The seat back cover 15 is made of a resin material and has a concave portion that is bent downward so that the seat frame 11 can be accommodated between the shell 13 and a peripheral portion that rises upward from the peripheral end so as to surround the concave portion. Formed.

  The seat back cover 15 is fixed and attached to the lower surface of the seat frame 11 by, for example, screwing.

  A convex frame contact portion 15 a having a longitudinal direction in the left-right direction is provided at a substantially central position on the lower surface of the seat back cover 15. And the recessed part (in other words, bowl-shaped recessed part) of a longitudinal cross-sectional semicircle is formed in the lower end side of the said frame contact part 15a along a longitudinal direction.

  The seat 10 (specifically, the cushion 14) is in a suitable horizontal posture for seating in a state where the recess at the lower end of the frame contact portion 15a is in contact with the horizontal portion 6b of the horizontal frame 6.

  And the rotation mechanism of the chair which concerns on this invention in this embodiment is the seat frame 11 which is a rotation member, and the rotating shaft 4a which is the rotation support part which supports the said seat frame 11 so that rotation is possible. And a resistance member 18 disposed on the peripheral surface of the pivot shaft 4a and interposed between the pivot shaft 4a and the seat frame 11 to impart frictional resistance against the pivot of the seat frame 11. I have to.

  In this embodiment, an O-ring is attached as a resistance member 18 to an annular groove formed on the peripheral surface of the rotation shaft 4a provided on the side leg frame 4 that is a rotation support portion.

  Further, the seat frame 11 that is a rotating member includes a vertical portion 11e, an upper flange 11f that projects outward from the upper end of the vertical portion 11e, and a lower flange 11g that projects outward from the lower end of the vertical portion 11e.

  The lower surfaces of the upper flanges 11f of the left and right side frames 11B of the seat frame 11 are pressed against the O-ring 18 to such an extent that the O-ring 18 is slightly deformed. In other words, the dimensions of each part of the seat frame 11, the rotation shaft 4a and the O-ring 18 are adjusted to each other so that the lower surface of the upper flange 11f is pressed against the O-ring 18 in that way.

  Thereby, when the seat frame 11 rotates, a frictional resistance is given so as to brake the rotation of the seat frame 11.

  In this embodiment, one rotation shaft 4a is provided with one O-ring 18 as a resistance member. However, two or more resistance members 18 are provided on one rotation support portion. May be. The magnitude of the frictional resistance is adjusted by adjusting the number of installed resistance members 18, and the force required to rotate the seat frame 11 can be adjusted appropriately. In particular, when the O-ring 18 is used as the resistance member as in the present embodiment, the adjustment of the number of the O-rings 18 is easy and simple, and hence the frictional resistance with respect to the rotation of the seat frame 11 can be easily adjusted. This mechanism is easily configured.

  Further, in this embodiment, the O-ring 18 as a resistance member is provided on both of the pair of left and right rotating shafts 4a, 4a, but the resistance member is provided only on one of the rotating shafts 4a. Anyway.

  In this embodiment, the upper flange 11f of the seat frame 11 is pressed against the resistance member 18, but the upper surface of the lower flange 11g may be pressed against the resistance member 18, or the upper flange 11f. Both the lower surface of the lower flange 11g and the upper surface of the lower flange 11g may be pressed against the resistance member 18. When only the upper flange 11 f is pressed against the resistance member 18, it is not essential for the present invention that the seat frame 11 has the lower flange 11 g, and only the lower flange 11 g is pressed against the resistance member 18. It is not essential for the present invention that the seat frame 11 has the upper flange 11f when applied.

  The resistance member 18 in the present invention is not limited to the O-ring attached to the peripheral surface of the rotating shaft 4a, but may be a resin-made annular belt member, or extends over the entire periphery of the peripheral surface of the rotating shaft 4a. It may be an embodiment provided not in a ring or ring but in only a part in the circumferential direction of the rotating shaft 4a.

  The resistance member 18 may also be provided on the seat frame 11 side. Specifically, for example, as shown in FIG. 11, a resin plate-like member or the like may be attached to a recess formed in the lower surface of the upper flange 11 f of the seat frame 11.

  That is, for example, as shown in FIG. 11, the resistance member 18 according to the present invention is attached and provided at a position on the side of the seat frame 11 facing the peripheral surface of the rotating shaft 4a provided on the side leg frame 4. May be. In other words, the resistance member 18 in the present invention may be provided at a position of the rotating member (11) facing the peripheral surface of the rotating support portion (4a).

  Further, the place where the resistance member 18 contacts is the lower surface of the upper flange 11f of the seat frame 11 and the peripheral surface of the rotation shaft 4a, in other words, the rotation member (11) and the rotation support portion (4a) face each other. Not limited to places. Specifically, for example, as shown in FIG. 12, a resistance member 18 formed in a resinous annular band shape is attached to the peripheral surface of the rotating shaft 4 a, and the side end surface of the resistance member 18 is a side frame of the seat frame 11. You may make it press on the side surface of the vertical part 11e of 11B. In the example shown in FIG. 12, the contact protrusion 4b is formed over the entire circumference of the rotating shaft 4a so as to be a bank for pressing the resistance member 18 against the side frame 11B of the seat frame 11. The

  Here, in the example shown in FIG. 12, it can be said that the resistance member 18 is disposed on the peripheral surface of the rotation shaft 4 a that is the rotation support portion.

  In the case of the example shown in FIG. 12, it is not essential for the present invention that the seat frame 11 has the upper flange 11f or the lower flange 11g.

  9 to 12, reference numeral 19 denotes a bush that penetrates the through hole 11 d provided in the vertical portion 11 e of the side frame 11 B of the seat frame 11 and penetrates the rotating shaft 4 a provided in the side leg frame 4. Reference numeral 20 denotes a retaining ring for preventing the rotation shaft 4a from coming off from the through hole 11d (or the bush 19).

  According to the pivot mechanism of the chair configured as described above, the seat frame 11 that is a pivot member by the O-ring 18 that is a resistance member disposed on the peripheral surface of the pivot shaft 4a that is the pivot support portion. Friction resistance is applied to the rotation of the chair, and resistance can be applied to the rotation of the chair seat 10 without using a structure that exerts friction resistance by tightening the screw. The loosening of the tightening reduces the frictional resistance so that the seat can easily rotate, preventing the seat in the vertical posture from falling unexpectedly even though the user does not intend to do so. It is possible to improve the comfort of use of the chair including the rotation of the chair.

  Although the above-described embodiment is an example of a preferred embodiment for carrying out the present invention, the embodiment of the present invention is not limited to the above-described embodiment, and the present invention is not limited to the scope of the present invention. The invention can be variously modified. For example, in the above-described embodiment, the rotation mechanism according to the present invention is applied to the chair 1 whose overall configuration is shown in FIGS. 1 and 2, but the chair to which the present invention is applied is illustrated in FIGS. It is not restricted to the chair 1 shown in 2, The thing of a various aspect can be selected suitably. Specifically, for example, it is not essential to be able to stack in the horizontal and front-and-rear directions as in the chair 1 of the above-described embodiment, and the support 2, the backrest 7, the seat 10, etc. Various specific shapes and modes of each component can be appropriately selected based on the use and design of the chair. Furthermore, as an example, as a chair to which the present invention is applied, having the backrest 7 is not an essential configuration, and it is not an essential configuration that the seat 10 includes the cushion 14.

  In the above-described embodiment, both end portions (specifically, the front end portion and the rear end portion) of the elastic member 12 are supported by the seat frame 11, but the support mode of the elastic member 12 is limited to this. Instead of this, it may be attached to and supported by the shell 13. Specifically, for example, the shell is configured to have a hard peripheral edge and a soft (in other words, bendable and deformable) central portion, and both ends of the elastic member 12 are supported by the hard peripheral edge of the shell. You may be made to do. That is, the seat frame (11), the shell (13), and the elastic member (12) can be roughly divided into two modes. One is a shell that can be bent and deformed at least in the central portion, and a seat that is rigid in at least the peripheral portion. And a shell having a rigid peripheral edge portion and a deformable deformable central portion, wherein both ends of the elastic member are attached to and supported by the hard peripheral edge portion of the seat frame. It is an aspect provided with a seat frame and having both ends of the elastic member attached to and supported by the hard peripheral edge of the shell.

  In the above-described embodiment, the chair 1 includes the seat frame 11 and the seat back cover 15, but the chair to which the present invention is applied does not necessarily include the seat frame 11 and the seat back cover 15. Not a required configuration. That is, a component member that is configured as an integral unit having a configuration / function corresponding to the configuration / function of the seat frame 11 and the seat back cover 15 in the above-described embodiment may be used.

  In the above-described embodiment, the rotation shaft 4a is used as a rotation support portion and the seat frame 11 is used as a rotation member so that the seat frame 11 rotates with respect to the support body 2. The combination with the rotation support portion is not limited to that in the above-described embodiment. Specifically, for example, a headrest that can be tilted back and forth is used as a rotating member, and a pair of rotating shafts arranged in the left and right directions that rotatably support the headrest are supported at both left and right ends of the headrest. The armrests that can be rotated horizontally (specifically, the elbow rests) are used as rotating members, and the armrests are supported on the lower surface side of the armrests so as to be rotatable. The arranged rotation shaft may be used as a rotation support portion, or a memo stand or table that can rotate in the left-right direction, the front-rear direction, or another direction in front of the seated person is used as the rotation member. In addition, a rotation shaft that rotatably supports the memo stand and the table may be used as the rotation support member.

DESCRIPTION OF SYMBOLS 1 Chair 2 Support body 3 Front leg frame 4 Side leg frame 4a Rotating shaft 10 Seat 11 Seat frame 11A Front frame 11B Side frame 11C Rear frame 11d Through-hole 11e Vertical part 11f Upper flange 11g Lower flange 18 Resistance member

Claims (4)

  A rotation member, a rotation support portion that rotatably supports the rotation member, and a circumferential surface of the rotation support portion of the rotation member. And a resistance member that is provided between the rotation support portion and the rotation member and imparts a frictional resistance against the rotation of the rotation member. The chair turning mechanism.   The chair turning mechanism according to claim 1, wherein the resistance member is an O-ring.   The pivot member is a seat frame and the pivot support portion is a pivot shaft provided on a seat support, and the seat frame has a vertical portion, an upper flange projecting laterally from the vertical portion, and a lower portion. 2. The chair turn according to claim 1, wherein the resistance member is in contact with at least one of a lower surface of the upper flange and an upper surface of the lower flange. Moving mechanism.   A chair comprising the rotation mechanism according to any one of claims 1 to 3.