JP5477801B2 - Chair - Google Patents

Description

  The present invention relates to an office swivel chair suitably used in an office or the like.

  Conventionally, in chairs, particularly office chairs, the position and orientation of the frame are adjusted not only to raise and lower the seat, but also to adjust the backrest angle and the part for supporting the waist to the desired position of the seated person Thus, there has been proposed a chair that can provide a comfortable sitting comfort for the seated person or can provide a predetermined sitting posture according to the physique of the seated person (see, for example, Patent Document 1).

  In particular, those described in the above-mentioned patent documents can provide a posture in which a seated person cannot accumulate fatigue even by a long-time sitting posture by adjusting each movable part. . Specifically, these chairs are designed to be comfortable for the occupant by adjusting each movable part so that the shape, angle, etc. of the seating surface in contact with the occupant follows the comfortable seating posture for the occupant. It can provide comfort.

On the other hand, by arranging a fluid bag below the seating surface and adjusting the flow of fluid into and out of the fluid bag, the seating surface is deformed to provide a comfortable sitting comfort for the seated person. A chair to be tried has also been proposed (see, for example, Patent Documents 2 and 3).
JP 2002-119363 A JP 11-32866 A JP 2000-14726 A

  However, when the fluid bag as described above is employed, the fluid bag normally swells in all directions by simply flowing the fluid into the fluid bag. Therefore, a chair that can provide a more comfortable sitting comfort by deforming the seating surface more effectively by deforming the intended purpose as described above, that is, by effectively projecting a required part of the seating surface. Is currently required.

  This invention pays attention to such a point, and provides the chair which can change the predetermined location of a seating surface reliably by arranging a fluid bag.

  In order to achieve such an object, the present invention takes the following measures. That is, the chair according to the present invention includes a shell for receiving a load acting on a seating surface, a plurality of fluid bags attached to the shell to perform a cushion function, and the shell so as to cover these fluid bags. The exterior material attached to the chair is formed into a boundary by drawing a predetermined portion of the exterior material to the shell side, and the fluid bag is arranged so as to be adjacent to the boundary. .

  Here, the “sitting surface” is not limited to the surface that the seat has, but is a concept that collectively refers to the surface that can be supported when the seated person is seated, and includes not only the upper surface of the seat but also the front surface of the back. In some cases, the concept includes the armrest and the surface of the headrest.

  If it is such, the expansion / contraction in the direction which a fluid bag goes to a boundary, ie, a cushion function, will be suppressed by drawing in an exterior material and forming a boundary. That is, the fluid bag is easily deformed in other directions including a required direction to be deformed. By doing so, the cushion function with respect to the required direction of the fluid bag can be further improved to act on the seating surface. As a result, it is possible to provide a chair that can more suitably support a seated person.

  In order to more effectively draw the exterior material and achieve the above-described effect more effectively, the exterior material is configured so as to cover substantially the entire one surface of the shell on which the fluid bag is arranged.

As a specific configuration of the outer package, the outer package, and an external cushion molding urethane, and the one having a coated cloth mounted on the surface side of the external cushion, the external cushioning drawn as a boundary by location of it is hard in part, to suppress expansion and contraction that towards the more suitably the fluid bag boundary.

And in order to provide a boundary more clearly and locally, the present invention provides a groove on the surface of the external cushion, and draws the lead- in wire attached to the surface side of the upholstery fabric in the shell direction so that the lead- in wire It is characterized in that the boundary is formed by immersing the material in the groove together with the upholstery. And the said drawing wire is drawn in using the string penetrated by the said external cushion and the said shell. Further, if the wall is formed in the portion corresponding to the groove on the back surface of the external cushion, the fluid bag can be prevented from expanding and contracting in a larger area if the structure is configured to suppress the expansion and contraction of the fluid bag with respect to the wall corresponding to the boundary. The deformation of the fluid bag in the required direction can be facilitated.

  In order to securely secure the tension to the shell while ensuring a seating feeling, the fluid bag is covered with substantially the entire surface of one side of the shell, and the edge of the tension fabric is covered with the fluid bag. It is desirable to fasten to the opposite side of one side of the shell.

  And in order to protect a fluid bag effectively, it is preferable to arrange | position an external cushion so that the circumference | surroundings of the said fluid bag may be enclosed.

  A configuration in which the external cushion is arranged between a plurality of fluid bags can be cited as a configuration for facilitating the deformation of the individual fluid bags in the plurality of fluid bags so as not to interfere with each other.

  In addition, in order to synchronize the deformation of the plurality of fluid bags, deform the seating surface more quickly, and effectively avoid the interference of the communication channel with the fluid bag or the external cushion, the plurality of fluid bags are communicated. It is desirable that a passage for inserting the communication flow path is provided in the shell as a communication flow path to be further provided. At that time, if the passage is arranged at a location that receives the seating load on the shell, the flow of the fluid can be improved by providing a flow path protection portion that can protect the communication flow path at the location. The communication channel can be arranged at a required position while ensuring.

  In order to achieve compatibility with other functions of the chair such as assembly efficiency and synchro tilt, a seat inner shell in which the shell is supported by the seat outer shell can be cited. In such a case, it is desirable that the seat inner shell is detachably attached to the seat outer shell so that work such as replacement after assembly can be performed efficiently. Moreover, if it is such, the function of the existing chair can be effectively implement | achieved, handling a fluid bag, such as arrange | positioning a seat inner shell so that sliding back and forth is possible.

  On the other hand, in order to achieve compatibility with other functions of the chair such as assembly efficiency and synchro tilt, a back inner shell in which the shell is supported by the back outer shell can be cited. In such a case, it is desirable that the back inner shell is detachably attached to the back outer shell so that work such as replacement of the fluid bag after assembly can be performed efficiently. Moreover, when it is set as such, it is good also as what can arrange | position a back inner shell so that a vertical motion is possible with respect to a back outer shell, and can adapt it according to a seated person's physique suitably.

  According to the present invention, the expansion and contraction in the direction toward the boundary, that is, the cushion function, is suppressed by pulling the exterior material and the boundary is formed. Therefore, the fluid bag is required to be deformed. It becomes easy to deform toward other directions including. By doing so, the cushion function with respect to the required direction of the fluid bag can be further improved to act on the seating surface. As a result, it is possible to provide a chair that can more suitably support a seated person.

  Hereinafter, one embodiment and each modification when the present invention is applied to a synchro tilt type office swivel chair will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, this chair has a seat 4 disposed on a support base 2 supported by a leg 1 via a seat receiver 3, and a backrest 5 is tilted backward on the support base 2. It is operably attached. The backrest 5 is provided with a lumbar support 6, a headrest 7 and an armrest 8. Hereinafter, the configuration of each unit will be described.

<Configuration of leg 1>
As shown in FIGS. 1 to 3, the leg portion 1 includes a leg blade type leg base 11 having casters 11 a and leg struts 13 erected at the center of the leg base 11. The leg support 13 is a normal one mainly composed of a gas spring, and the support base 2 is attached to the upper end of the leg support 13.

<Configuration of Support Base 2>
As shown in FIGS. 2 and 3, the support base portion 2 is supported by the leg portion 1 so as to be able to turn horizontally. The support base portion 2 is inserted into the housing 15 and the housing 15 attached to the leg support 13. A support shaft 17 for supporting the backrest and a tilt reaction force generating mechanism (not shown) that applies a force to the support shaft 17 to generate an elastic repulsive force with respect to the backward tilting operation of the backrest 5 are provided. . The tilt reaction force generation mechanism is configured to be able to apply an elastic repulsion force in the rotational direction to the support shaft 17 by using a coil spring, a gas spring or the like (not shown), but is a normal one. Description is omitted.

<Structure of seat 3>
As shown in FIGS. 3 and 4, the seat receiver 3 includes a seat receiver body 19 and a guide member 21 that is attached to the upper surface of the seat receiver body 19 with screws or the like and guides the seat 4 so as to be movable back and forth. Do it. The seat main body 19 is a thick plate reinforced by a large number of ribs. The front end side 19a is supported by the support base 2 so as to be movable back and forth, and the rear end side 19b is described later. The backrest 5 is supported so as to be relatively rotatable. With this configuration, the seat 4 disposed on the seat receiver 3 sinks at a constant angle ratio with respect to the back tilting operation of the backrest 5, in other words, a synchro tilting operation is realized. It has become.

  Here, the chair according to the present embodiment is attached to the seat inner shell 27 or the back inner shell 55 for receiving the load acting on the seating surfaces 4a and 5a, and the seat inner shell 27 or the back inner shell 55 to perform a cushion function. A plurality of fluid bags 31, 33, 59, 61 provided, and an exterior material 29 attached to the seat inner shell 27 or the back inner shell 55 so as to cover these fluid bags 31, 33, 59, 61, 57, a predetermined portion of the exterior material 29, 57 is drawn into the seat inner shell 27 or the back inner shell 55 side to form boundaries k1, k11, and the boundaries k1, k11 are sandwiched therebetween. The fluid bags 31, 33, 59, 61 are arranged so as to be adjacent to each other.

  Hereinafter, the configuration of the present invention will be described based on the configurations of the seat 4 and the backrest 5.

<Configuration of seat 4>
As shown in FIGS. 1 to 9, the seat 4 includes a thigh support region 4b, a buttocks support region 4c, and left and right side support regions 4d and 4e. A seat unit 25 is mounted on the seat outer shell 23.

  The seat outer shell 23 includes a shell main body 23a that is slidably slidable in the front-rear direction on the seat main body 19, and side support forming portions 23b and 23c provided on both the left and right sides of the shell main body 23a. It is integrally formed of synthetic resin. As shown in FIG. 4, a slit 23d extending in the front-rear direction is formed in the shell body 23a. These slits 23d have an inverted L-shaped transverse cross-sectional shape whose bottom surface side is narrower than the upper surface side, and the guide member 21 slidably engaged with these slits 23d is screwed into the seat receiving body 19. The seat outer shell 23 is attached to the seat receiving body 19 so as to be movable back and forth and so as not to be detached. A lock mechanism (not shown) for adjusting the fixing position of the seat 4 in the front-rear direction is provided between the seat outer shell 23 and the seat receiving body 19. This locking mechanism can always release the locked state by locking the seat outer shell 23 to the seat receiving body 19 and operating one of the non-fluid bag operating bodies 4y described later. As usual. One side support forming portion 23b of the seat outer shell 23 is provided with a notch window 23e for exposing a fluid bag operation body 4x, that is, an opening / closing operation body 35c and a release operation body 37c described later, The other side support forming portion 23c is provided with an operating body mounting portion 23f for mounting the non-fluid bag operating body 4y. The seat unit 25 is mounted on the seat outer shell 23 thus formed.

  As shown in FIG. 4, the seat unit 25 includes a seat inner shell 27 that functions as a shell or a unit substrate, and an exterior material 29 that covers the surface side of the seat inner shell 27. Between the shell 27 and the exterior member 29, a thigh support fluid bag 31 and a heel support fluid bag 33 which are inflated and contracted by the introduction and introduction of air as fluid, and a seat inner A seat fluid control device 91 is attached to the shell 27 for controlling the flow of fluid into and out of the fluid bags 31 and 33. These fluid bags 31 and 33 are connected so as to be able to communicate with each other through a communication channel 39 opened and closed by an on-off valve 35, as shown in FIGS. The air can be opened to the atmosphere as an external fluid existence environment via a release flow path 41 opened and closed by a release valve 37. These valves 35 and 37 constituting the seat fluid control device 91 are attached to the seat inner shell 27 by a lower surface cover 43 which is a holding member.

  As shown in FIGS. 4 and 9, the seat inner shell 27 is detachably attached to the seat outer shell 23 and receives a load acting on the seating surface 4a of the seat 4. And side support forming portions 27b provided on the left and right sides of the shell body 27a. The shell main body 27a and the side support forming portion 27b are integrally formed of synthetic resin or the like, and the side support forming portion 27b has a recessed shape on the back side. As shown in FIGS. 4 and 7, both the fluid bags 31 and 33 are attached to the surface side of the shell main body 27 a, and the opening and closing valve 35 and the release valve 37 constituting the seat fluid control device 91. Is positioned and held on the back side of the side support forming portion 27b by ribs 27f. Then, by attaching the lower surface cover 43 to the side support forming portion 27b with screws or the like, the both valves 35 and 37 are held by the seat inner shell 27. A pair of passages 27c are formed at the boundary between the shell body 27a and the side support forming portion 27b, and the fluid bags 31, 33 and the valves 35, 37 are connected to the passages 27c. The pipes 39a and 39b are inserted. As shown in FIGS. 4 and 9, each of the passages 27c includes a tunnel portion 27d that is a flow path protecting portion formed by recessing the back side of the seat inner shell 27 in a groove shape, and the inside of the tunnel portion 27d. And a hole 27e communicating with the surface side of the seat inner shell 27. The width and depth of the tunnel portion 27d are set to dimensions that allow the pipes 39a and 39b to be fitted therein. The outer peripheral portion of the outer packaging material 29 is fixed to the peripheral portion of the seat inner shell 27 thus formed and the lower surface side opposite to the front surface side where the fluid bags 31 and 33 are disposed, using a tacker or the like (not shown). I wear it.

  As shown in FIGS. 3 to 6, the exterior material 29 is configured to cover substantially the entire upper surface of the seat inner shell 27 provided with both fluid bags 31 and 33, and is made of molded urethane or the like. The outer cushion 29a is formed, and a tensioned fabric 29b that covers the entire surface of the seat inner shell 27 including the surface of the outer cushion 29a. That is, the external cushion 29a is disposed between the fluid bags 31 and 33 and the upholstery 29b. The exterior material 29 is drawn toward the seat inner shell 27 at a middle position in the front-rear direction of the seat 4, thereby forming a boundary k1 that partitions the thigh support region 4b and the buttocks support region 4c. ing. The thigh support fluid bag 31 is built in the thigh support region 4b, and the heel support fluid bag 33 is built in the heel support region 4c. In other words, these fluid bags 31 and 33 are arranged adjacent to each other with the boundary k1 interposed therebetween. The configuration of the retracted portion of the exterior material 29 will be specifically described as follows. As shown in an enlarged view in FIG. 6, a region defining groove k1m is formed in a portion corresponding to the boundary k1 on the surface side of the external cushion 29a. Then, the lead-in wire k1s attached to the surface side of the upholstery 29b is pulled in the direction of the seat inner shell 27, and the draw-in wire k1s is immersed in the region defining groove k1m together with the upholstery 29b and stored. To form the boundary k1. A string k1h or the like penetrated through the outer cushion 29a and the seat inner shell 27 is used for drawing in the lead-in wire k1s.

  In addition, as shown in FIG. 5, the site | part corresponding to the boundary k1 formed between both the fluid bags 31 and 33 in the bottom face side of the external cushion 29a arrange | positioned so that the circumference | surroundings of both the fluid bags 31 and 33 may be enclosed Is formed with a wall k1k including the region defining groove k1m, and the wall k1k gives a substantial thickness to the boundary k1. In other words, the wall k1k positions the adjacent fluid bags 31 and 33 so as not to approach each other below a certain distance. In this seat 4, as shown in FIG. 1, boundaries k2, k3 are also formed between the thigh support region 4b and the left and right side support regions 4d, 4e, and the buttocks support region Boundaries k4 and k5 are also formed between 4c and the left and right side support regions 4d and 4e. And the positioning of the fluid bag 31 for supporting the thigh in the left-right direction is performed by the walls k2k, k3k formed in the portions corresponding to the boundaries k2, k3 on the back side of the external cushion 29a, and the boundary Positioning in the left-right direction of the fluid bag 33 for supporting the heel portion is performed by walls k4k, k5k formed at portions corresponding to k4, k5.

  As shown in FIGS. 4, 7, and 8, the thigh support fluid bag 31 includes a bag body 31 a that is formed of a synthetic resin film or the like and forms a fluid chamber 31 b that can be inflated and contracted therein, and the fluid And an internal cushion 31c, which is an elastic body for self-recovery housed in the chamber 31b, and has a fluid outlet 31d communicating with the fluid chamber 31b at one end thereof. The internal cushion 31c is made of slab urethane or the like, and has a notch 31f for forming a cavity in a portion corresponding to the fluid outlet 31d and is fluid on the surface on the seating surface 4a side. A flow groove 31g is provided as a flow control means for smoothing the air flow. For example, a plurality of the flow grooves 31g are formed in parallel. The fluid bag 31 has a thickness having an upright wall portion 31e at the periphery thereof, and has a smaller thickness change rate than a coplanar fluid bag having no upright wall portion.

  Here, the “thickness change rate” refers to a unit flow rate when fluid, which is air in the present embodiment, is led into and out of the fluid bag 31 and fluid bags 33, 59, and 61 to be described later without applying a load from the outside. It means the change value of the thickness dimension. In addition, the said thickness dimension is a dimension of the direction orthogonal to the seating surfaces 4a and 5a, Comprising: The value of a site | part with the largest change is said. In other words, the thickness dimension is a dimension in a direction perpendicular to the seating surfaces 4a and 5a, and is a value of a part that most affects the seating surfaces 4a and 5a. In order to set the seating feeling, rather than how the total volume of the fluid bags 31, 33, 59, 61 changes, how much the fluid bags 31, 33, 59, 61 are in the direction of the seating surfaces 4a, 5a. This is because it is necessary to pay attention to whether it expands or contracts.

  The rate of change in thickness of the fluid bags 31, 33, 59, 61 is influenced by the fluid bags 31, 33, 59, 61 incorporated in the seat 4 and the backrest 5 on the seating surfaces 4 a, 5 a of the seat 4 and the backrest 5. It is a characteristic value that represents the magnitude of the influence. When the rate of change in thickness shows a large value, it means that the thickness of the fluid bag 31, 33, 59, 61 is more likely to change for the same amount of fluid flowing in and out. Showing a small value means the opposite.

  The rate of change in thickness can be basically adjusted by making the substantial capacity of the fluid bags 31, 33, 59, 61 different. However, in the fluid bag 31, 33, 59, 61 applied to the chair, depending on the overall shape of the seat 4 or the backrest 5, or the shape or width of the region in which the fluid bag 31, 33, 59, 61 is incorporated, Certain restrictions are imposed on the projected area and shape from the seating surfaces 4a and 5a. Therefore, in order to adjust the rate of change in thickness of the fluid bags 31, 33, 59, 61 under such restrictions, the peripheral shape of the fluid bags 31, 33, 59, 61, that is, the standing wall portions 31e, 33e, 59e, 61e Presence / absence and deformation characteristics of the standing wall portions 31e, 33e, 59e, 61e are important factors.

  As shown in FIGS. 4, 7, and 8, the heel support fluid bag 33 includes a bag body 33 a that is formed of a synthetic resin film or the like and forms a fluid chamber 33 b that can be expanded and contracted therein, and the fluid chamber 33 b. An internal cushion 33c, which is an elastic body for self-recovery accommodated therein, has a fluid outlet 33d communicating with the fluid chamber 33b at one end thereof. The inner cushion 33c is made of slab urethane or the like, and has a notch 33f for forming a cavity at a portion corresponding to the fluid outlet port 33d, and is fluid on the surface on the seating surface 4a side. A flow groove 33g is provided as a flow control means for smoothing the air flow. For example, a plurality of the flow grooves 33g are formed in parallel. The fluid bag 33 has a thickness having a standing wall portion 33e at the periphery thereof, and the rate of change in thickness is set smaller than that of a fluid bag having the same plane shape without the standing wall portion. The fluid outlet 33 d of the fluid bag 33 is connected to the fluid outlet 31 d of the fluid bag 31 via the communication channel 39, and the communication channel 39 can be intermittently connected by the opening / closing valve 35. ing.

  As shown in FIGS. 4 and 7, the opening / closing valve 35 has a first port 35a at one end and a second port 35b at the other end, in order to intermittently connect the ports 35a and 35b. It is a normal thing provided with the valve element which is not illustrated. As shown in FIG. 7, the open / close valve 35 allows the first port 35a and the second port 35b to communicate with each other when an open / close operating body 35c having a lever shape is operated to an open position o shown by a solid line. The communication between the ports 35a and 35b is cut off when operated to the closed position c shown in FIG. The first port 35a of the open / close valve 35 is connected to the fluid outlet 31d of the thigh support fluid bag 31 via a pipe 39a that constitutes a part of the communication channel 39, and the second port 35b is In addition, it is connected to a fluid outlet 33 d of the flange supporting fluid bag 33 through a pipe 39 b constituting a part of the communication channel 39. The release valve 37 is adjacent to the opening / closing valve 35.

  As shown in FIGS. 4 and 7, the release valve 37 has a first port 37a at one end and a second port 37b at the other end, in order to intermittently connect the ports 37a and 37b. It is a normal thing provided with the valve element which is not illustrated. The release valve 37 includes a release operation body 37c having a push button shape. When the release operation body 37c is pressed to the release position, the first port 37a and the second port 37b communicate with each other. When the operation is stopped, the communication between the ports 37a and 37b is blocked. The first port 37a of the release valve 37 is open to the atmosphere as an external fluid existence environment, and the second port 37b is connected to the thigh via a pipe 41a constituting a part of the release channel 41. It is connected to the fluid outlet 31 d of the part support fluid bag 31. As described above, the release valve 37 and the opening / closing valve 35 are attached to the lower surface side of one side support region 4d of the seat 4 using the lower surface cover 43 serving as a holding member.

  As shown in FIGS. 4 and 9, the lower surface cover 43 has a hole 43a for attaching the opening / closing operation body 35c of the opening / closing valve 35 and a window for exposing the release operation body 37c of the release valve 37 to the outside. It is a plate having 43b and is attached to the side support forming portion 27b of the seat inner shell 27 using screws or the like. In a state where the lower surface cover 43 is attached, both valves 35 and 37 positioned by the ribs 27f are held in a sandwiched state between the lower surface cover 43 and the side support forming portion 27b. As shown in FIG. 2, the opening / closing operation body 35 c disposed on the outer surface side of the lower surface cover 43 is mechanically attached to the opening / closing valve 35 through the hole 43 a, and the release operation body 37 c of the release valve 37. Is exposed to the outside through the window 43b. In the state in which the seat unit 25 configured as described above is mounted on the seat outer shell 23, the lower surface cover 43 fits into the notch window 23e of the seat outer shell 23, and in appearance, the lower surface cover. The outer surface of 43 is formed so as to form a part of the outer surface of the seat outer shell 23. Since the coupling structure between the seat inner shell 27 of the seat unit 25 and the seat outer shell 23 is a normal one, illustration and description thereof are omitted. According to the above configuration, the operation portions 35c and 37c of both valves 35 and 37 are also components of the seat unit 25, so that the seat unit 25 including the operation portions 35c and 37c can be attached and detached as a unit. , Can be moved. Further, when the seat unit 25 is mounted on the seat outer shell 23, the seat unit 25 can be directly operated from outside the chair.

<Configuration of backrest 5>
The backrest 5 includes a back support region 5b, a waist support region 5c, and left and right side support regions 5d and 5e, as shown in FIGS. As a typical structure, the back unit 53 is mounted on the surface of the back outer shell 51.

  As shown in FIGS. 2 and 3, the back outer shell 51 is a continuous shell body 51a, a lower end portion 51b positioned below the seat 4, and the shell body 51a smoothly connected to the lower end portion 51b. And an intermediate bent portion 51c. In other words, the back outer shell 51 is formed by extending the lower end 51b to the support base 2 and attaching the extended end 51b1 to the support shaft 17 for supporting the backrest of the support base 2. Yes. The back outer shell 51 is, for example, an integrally formed product made of aluminum die cast, and has a strength comparable to a back support rod in a normal chair. The back outer shell 51 can tilt backward as the support shaft 17 rotates in the same manner as the back support rod. On the upper surface side of the lower end portion 51b of the back outer shell 51, a seat receiving mounting portion 51d for supporting the rear end side 19b of the seat receiving body 19 so as to be relatively rotatable is provided. Further, an armrest mounting portion 51e for mounting the armrest 8 is integrally provided on the surface side of the intermediate bent portion 51c. The back unit 53 is attached to the surface of the back outer shell 51 thus formed.

  As shown in FIGS. 10, 12, and 16, the back unit 53 includes a back inner shell 55 that functions as a shell or unit board of the present invention, and an exterior material 57 that covers the surface side of the back inner shell 55. Thus, between the back inner shell 55 and the exterior member 57, a back support fluid bag 59 that expands and contracts by the introduction and introduction of fluid air, and a waist support fluid bag 61, The back inner shell 55 is provided with a back fluid control device 93 for controlling the flow of fluid into and out of the fluid bags 59 and 61. As shown in FIGS. 10 and 13, both the fluid bags 59 and 61 are connected to each other through a communication channel 69 that is opened and closed by an opening / closing valve 65, and one of the fluid bags 61 is a release valve. It can be opened to the atmosphere, which is the environment where the external fluid exists, via a release flow path 71 opened and closed by 67. These valves 65 and 67 constituting the back fluid control device 93 are attached to the back inner shell 55 by a back cover 73 which is a holding member.

  As shown in FIGS. 10 and 15, the back inner shell 55 is detachably attached to the back outer shell 51 to receive a load acting on the seating surface 5 a of the backrest 5. 55a and side support forming portions 55b provided on the left and right sides of the shell main body 55a. The shell main body 55a and the side support forming portion 55b are integrally formed of synthetic resin or the like, and the side support forming portion 55b has a recessed shape on the back side as shown in FIG. ing. The fluid bags 59 and 61 are attached to the surface side of the shell body 55a, and the opening / closing valve 65 and the release valve 67 constituting the back fluid control device 93 are provided on the back side of the side support forming portion 55b. Are positioned and held by ribs 55f. The back cover 73 is attached to the side support forming portion 55b with screws, elastic claws or the like, so that the valves 65 and 67 are held by the back inner shell 55. As shown in FIGS. 10 and 15, a pair of passages 55c are formed at the boundary between the shell body 55a and the side support forming portion 55b, and the fluid bags 59, 61 and the passages 55c are formed in these passages 55c. Pipings 69a and 69b for connecting the valves 65 and 67 are inserted. Each of the passages 55c is connected to a tunnel portion 55d that is a flow path protecting portion formed by recessing the back side of the back inner shell 55 into a groove shape, and the inside of the tunnel portion 55d communicates with the surface side of the back inner shell 55. And a hole 55e. The width and depth of the tunnel portion 55d are set to dimensions that allow the pipes 69a and 69b to be fitted therein. The outer peripheral portion of the exterior material 57 is fixed to the peripheral portion of the back inner shell 55 thus formed and the back side opposite to the front surface side where the fluid bags 59 and 61 are disposed by using a tacker or the like (not shown). I wear it.

  As shown in FIGS. 10 to 12 and 16, the exterior material 57 covers substantially the entire upper surface of the back inner shell 55 in which both fluid bags 59 and 61 are arranged, and is molded urethane. The outer cushion 57a made by the above and the like, and a tension fabric 57b covering the surface side of the outer cushion 57a are provided. That is, the external cushion 57a is disposed between the fluid bags 59 and 61 and the tension fabric 57b. The exterior material 57 is drawn toward the back inner shell 55 at an intermediate position in the vertical direction of the backrest 5, thereby forming a boundary k11 that partitions the back support region 5b and the waist support region 5c. Has been. The back support fluid bag 59 is built in the back support region 5b, and the waist support fluid bag 61 is built in the waist support region 5c. In other words, these two fluid bags 59 and 61 are arranged adjacent to each other with the boundary k11 interposed therebetween. The configuration of the retracted portion of the exterior material 57 will be specifically described as follows. As shown in an enlarged view in FIG. 12, a region defining groove k11m is formed in a portion corresponding to the boundary k11 on the surface side of the external cushion 57a. Then, by pulling the lead-in wire k11s attached to the surface side of the upholstery 57b in the direction of the back inner shell 55, the draw-in wire k11s is immersed in the region defining groove k11m together with the upholstery 57b. k11 is formed. A string k11h or the like penetrated through the external cushion 57a and the back inner shell 55 is used for drawing the lead-in wire k11s.

  In addition, as shown in FIG. 11, it corresponds to the boundary k11 formed between the fluid bags 59 and 61 on the back side of the external cushion 57a arranged so as to surround the fluid bags 59 and 61. A wall k11k that encloses the region defining groove k11m is formed at the portion to be formed, and a substantial thickness is given to the boundary k11 by the wall k11k. In other words, the wall k11k positions the adjacent fluid bags 59 and 61 so as not to approach each other below a certain distance. In this backrest 5, as shown in FIG. 1, boundaries k12 and k13 are also formed between the back support region 5b and the left and right side support regions 5d and 5e, and the waist support region 5c. Boundaries k14 and k15 are also formed between the left and right side support regions 5d and 5e. The back support fluid bag 59 is positioned in the left-right direction by the walls k12k, k13k formed at the portions corresponding to the boundaries k12, k13 on the back side of the external cushion 57a, and the boundary k14, Positioning of the waist bag supporting fluid bag 61 in the left-right direction is performed by walls k14k and k15k formed at a portion corresponding to k15.

  As shown in FIGS. 13 and 14, the back support fluid bag 59 is housed in a bag body 59a formed of a synthetic resin film or the like and forming a fluid chamber 59b that can be expanded and contracted therein, and the fluid chamber 59b. And an internal cushion 59c, which is an elastic body for self-reset, and has a fluid outlet 59d communicating with the fluid chamber 59b at one end thereof. The internal cushion 59c is made of slab urethane or the like, and has a notch 59f for forming a cavity in a portion corresponding to the fluid outlet port 59d and is fluid on the surface on the seating surface 4a side. A flow groove 59g is provided as a flow control means for smoothing the air flow. For example, a plurality of the flow grooves 59g are formed in parallel. The fluid bag 59 does not have a standing wall portion at the periphery thereof, and has a larger thickness change rate than the fluid bag having the same front shape having the standing wall portion.

  As shown in FIGS. 13 and 14, the waist supporting fluid bag 61 is housed in the fluid chamber 61b and a bag body 61a that is made of a synthetic resin film or the like and forms a fluid chamber 61b that can be expanded and contracted inside. And an internal cushion 61c, which is an elastic body for self-reset, and has a fluid outlet 61d communicating with the fluid chamber 61b at one end thereof. The internal cushion 61c is made of slab urethane or the like, and has a notch 61f for forming a cavity in a portion corresponding to the fluid outlet port 61d and is fluid on the surface on the seating surface 5a side. A flow groove 61g is provided as a flow control means for smoothing the air flow. For example, a plurality of the flow grooves 61g are formed in parallel. The fluid bag 61 is a thin bag that does not have a standing wall portion on its periphery, and has a thickness change rate larger than that of a fluid bag that has the standing wall portion and has the same front shape. The fluid bag 61 has a smaller area than the back support fluid bag 59 in a front view, and the volume of the fluid chamber 61b is that of the fluid chamber 59b of the back support fluid bag 59. It is set smaller than the volume. That is, the thickness change rate of the waist support fluid bag 61 is set to be larger than the thickness change rate of the back support fluid bag 59. The fluid outlet 61 d of the fluid bag 61 is connected to the fluid outlet 59 d of the fluid bag 59 via a communication channel 69, and the communication channel 69 can be intermittently connected by the opening / closing valve 65. ing.

  As shown in FIGS. 10 and 13, the open / close valve 65 has a first port 65 a at one end and a second port 65 b at the other end, in order to intermittently connect the ports 65 a and 65 b. It is a normal thing provided with the valve element which is not illustrated. As shown in FIG. 13, the opening / closing valve 65 allows the first port 65a and the second port 65b to communicate with each other when the lever-shaped opening / closing operation body 65c is operated to the open position o shown by the solid line. The communication between the ports 65a and 65b is cut off when operated to the closed position c shown in FIG. The first port 65a of the on-off valve 65 is connected to the fluid outlet 61d of the waist supporting fluid bag 61 via a pipe 69a that constitutes a part of the communication channel 69, and the second port 65b is It is connected to a fluid outlet 59 d of the back support fluid bag 59 through a pipe 69 b that constitutes a part of the communication channel 69. The release valve 67 is adjacent to the opening / closing valve 65.

  As shown in FIGS. 10 and 13, the release valve 67 has a first port 67a at one end and a second port 67b at the other end, in order to intermittently connect the ports 67a and 67b. It is a normal thing provided with the valve element which is not illustrated. The release valve 67 has a release operation body 67c having a push button shape. When the release operation body 67c is pressed to the release position, the first port 67a and the second port 67b communicate with each other. When the operation is stopped, the communication between the ports 67a and 67b is blocked. The first port 67a of the release valve 67 is open to the atmosphere as an external fluid existence environment, and the second port 67b is supported by the waist portion via a pipe 71a constituting a part of the release flow path 71. The fluid bag 61 is connected to the fluid outlet 61d. The release valve 67 and the opening / closing valve 65 are attached to the back side of one side support region 5d of the backrest 5 using the back cover 73 as a holding member as described above.

  As shown in FIGS. 2 and 15, the back cover 73 has a hole 73 a for attaching the opening / closing operation body 65 c of the opening / closing valve 65 and a window for exposing the release operation body 67 c of the release valve 67 to the outside. It is a plate-shaped member having 73b and is attached to the side support forming portion 55b of the back inner shell 55 using screws, elastic claws or the like. When the back cover 73 is attached, both valves 65 and 67 positioned by the rib 55f are held in a sandwiched state between the back cover 73 and the side support forming portion 55b. The opening / closing operation body 65c arranged on the outer surface side of the back cover 73 is mechanically attached to the opening / closing valve 65 through the hole 73a, and the release operation body 67c of the release valve 67 is connected through the window 73b. To be exposed to the outside. When the back unit 53 configured as described above is mounted on the surface of the back outer shell 51, the outer surface of the back cover 73 is formed so as to be continuous with the back surface of the back outer shell 51. Since the coupling structure between the back inner shell 55 and the back outer shell 51 of the back unit 53 is a normal one, illustration and description thereof are omitted. According to the above configuration, since the operation parts 65c and 67c of both valves 65 and 67 are also components of the back unit 53, the back unit 53 including the operation parts 65c and 67c can be attached and detached as a unit. , Can be moved. Further, when the back unit 53 is attached to the back outer shell 51, the back unit 53 is configured to be directly operable from the outside of the chair. The lumbar support 6 is provided on the backrest 5 formed as described above.

<Configuration of lumbar support 6>
As shown in FIGS. 3 and 16, the lumbar support 6 includes a lumbar support member 75 disposed on the surface side of the back inner shell 55 so as to bite into the back surface of the waist supporting fluid bag 61, and the lumbar support member. And a position adjusting mechanism 77 for moving the support member 75 in the vertical direction. The lumbar support member 75 has a curved surface 75a for sliding while pressing the back surface of the fluid bag 61. Specifically, the lumbar support member 75 has, for example, a bowl shape. On the back surface of the lumbar support member 75, a pair of protrusions 75b are provided. The position adjusting mechanism 77 includes a vertically extending pair of slits 77a provided on the back inner shell 55 for guiding the protrusions 75b, and an upper end 77c disposed on the back side of the back inner shell 55. An elevating operation lever 77b joined to the projection 75b facing the back side through 77a using a screw 75c. The gripping portions 77d of the elevating operation lever 77b protrude outward from both side edges of the spine unit 53. By applying an operating force in the vertical direction to the gripping portions 77d, the upper and lower portions of the lumbar support member 75 are The direction position can be changed.

<Configuration of other options>
As shown in FIGS. 1 to 3, the headrest 7 includes a headrest main body 79, a headrest frame 81 that supports the headrest main body 79, and a mounting portion 83 that holds the headrest frame 81 so as to be movable up and down. Thus, the attachment portion 83 is attached to the surface of the upper end portion of the back outer shell 51 using screws or the like. Since the mounting structure is a normal one, illustration and description are omitted.

  As shown in FIGS. 1 to 3, the armrest 8 is provided on each side of the backrest 5, and an elbow strut 87 having a base end attached to the armrest attaching portion 51 e of the back outer shell 51, And an elbow rest 89 supported by the elbow support 87.

  Next, the operation of the embodiment described above will be described.

  When this chair leans on the backrest 5, the backrest 5 performs a backward tilting operation with an elastic repulsive force. When the backrest 5 is tilted backward, the seat support 3 having the rear end supported on the lower end of the back outer shell 51 of the backrest 5 performs a synchro operation and tilts in a direction in which the rear end sinks while moving backward. By selectively operating the non-fluid bag operating body 4y provided on the lower surface side of the side support region 4e on the right side of the seat 4, the backrest 5 can be locked at a desired rearward tilt position, or the column 13 of the leg 1 can be locked. The height position of the seat surface can be changed by changing the expansion / contraction position of the seat 4, or the front-rear direction fixing position of the seat 4 relative to the seat receiver 3 can be changed. The above operation is realized by a known technique employed in a normal office swivel chair or a technique based thereon, and detailed description thereof is omitted. Hereinafter, the operation relating to the fluid bag will be described in detail.

<Operation related to the seat>
By operating the fluid bag operation body 4x disposed on the lower surface side of the left side support part 4d of the seat 4, that is, the opening / closing operation body 35c and the release operation body 37c constituting the seat fluid control device 91, the seat The fluid bag 31 for supporting the thigh and the fluid bag 33 for supporting the buttocks can be reciprocally expanded and contracted to adjust the holding state for the seated person.

  First, as shown by a solid line in FIG. 7, when the opening / closing operation body 35c is operated to the open position o, the fluid chamber 31b of the thigh support fluid bag 31 and the fluid chamber 33b of the buttock support fluid bag 33 communicate with each other. A communication state is established via the road 39. In this state, when the seated person moves the weight forward and presses the seating surface 4 a of the seat 4 with the thigh, the load in the compression direction on the thigh support fluid bag 31 is greater than the load on the buttocks support fluid bag 33. Also grows. As a result, the air in the thigh support fluid bag 31 flows into the buttocks support fluid bag 33 through the communication channel 39, the thigh support fluid bag 31 is reduced, and the thigh support fluid is reduced. The bag 33 is inflated. Conversely, when the seated person shifts his / her weight rearward and presses the seating surface 4a of the seat 4 with the buttocks, the load on the buttocks support fluid bag 33 becomes larger than the load on the thigh support fluid bag 31. As a result, the air in the buttocks support fluid bag 33 flows into the thigh support fluid bag 31 through the communication channel 39, and the buttocks support fluid bag 33 is reduced and the thigh support fluid bag 33 is reduced. The fluid bag 31 is inflated.

  As described above, when the opening / closing operation body 35c is operated to the open position o, both the fluid bags 31, 33 are inflated and contracted in accordance with the load acting on the seating surface 4a of the seat 4. The seat 4 exhibits the function of changing the support state following the change in the posture of the seated person. On the other hand, as shown by an imaginary line in FIG. 7, when the opening / closing operation body 35c is operated to the closed position c and the opening / closing valve 35 is switched to the shut-off state, both the fluid bags 31, 33 are locked in a desired deformation state. Will be. That is, when the thigh support fluid bag 31 is contracted and the buttocks support fluid bag 33 is locked in an inflated state, the seating surface 4a of the seat 4 holds the seated person in a forward tilted posture, which is suitable for work. It is possible to maintain a proper posture. On the other hand, when the buttocks support fluid bag 33 is contracted and the thigh support fluid bag 31 is locked in an inflated state, the seating surface 4a of the seat 4 is in a state of holding the seated person in a tilted posture, and a relaxed posture Is acceptable. Of course, both fluid bags 31 and 33 can be locked at an intermediate desired position between the forward tilt posture and the rear tilt posture described above. Even in the locked state, air flow and volume changes in the fluid bags 31 and 33 can occur, so that the fluid bags 31 and 33 can individually exhibit a cushion function.

  The air in the fluid bags 31 and 33 may gradually leak to the outside through a synthetic resin sheet or the like constituting the bag body, and the fluid bags 31 and 33 may be appropriately inflated when used for a long period of time. It cannot be obtained. In this case, the opening / closing valve 35 is opened and a state where no load is applied to the seating surface 4a of the seat 4 is maintained, and then the release operation body 37c is pressed to the release position to open the release valve 37. . As a result, the fluid chambers 31 b and 33 b of both the fluid bags 31 and 33 are opened to the atmosphere as an external fluid existence environment via the release flow path 41. As a result, both the fluid bags 31 and 33 are inflated while sucking outside air, that is, fluid air, by the elastic repulsion force of the internal cushions 31c and 33c accommodated therein, and self-reset to the normal reference state. Become. When the fluid bags 31 and 33 have completely returned to the reference position, if the pressing operation to the release operation body 37c is stopped and the release flow path 41 is closed, the above-described operation is performed again. It becomes possible.

<Operation of backrest>
Built in the backrest 5 by operating the opening / closing operation body 65c and the release operation body 67c constituting the back fluid control device 93 disposed on the back side of the side support portion 5d formed on the left side of the backrest 5. The back support fluid bag 59 and the waist support fluid bag 61 can be reciprocally expanded and contracted to adjust the holding state for the seated person.

  First, as shown by a solid line in FIG. 13, when the opening / closing operation body 65 c is operated to the open position o, the fluid chamber 59 b of the back support fluid bag 59 and the fluid chamber 61 b of the waist support fluid bag 61 communicate with each other. It becomes a communication state via. In this state, when the seated person presses the seating surface 5a of the backrest 5 with his back in accordance with a backward tilting operation or the like, the load in the compression direction on the back support fluid bag 59 is larger than the load on the waist support fluid bag 61. Become. As a result, air, which is a fluid in the back support fluid bag 59, flows into the waist support fluid bag 61 through the communication channel 69, the back support fluid bag 59 is reduced, and the waist support fluid bag is reduced. 61 swells. On the contrary, when the seated person presses the seating surface 5a of the backrest 5 at the waist with a forward tilting operation or the like, the load on the waist support fluid bag 61 becomes larger than the load on the back support fluid bag 59. As a result, the air in the waist support fluid bag 61 flows into the back support fluid bag 59 through the communication channel 69, the waist support fluid bag 61 shrinks, and the back support fluid bag 59 inflates. .

  As described above, when the opening / closing operation body 65c is operated to the open position o, both the fluid bags 59 and 61 expand and contract in a reciprocal manner according to the load acting on the seating surface 5a of the backrest 5. Yes, the backrest 5 exhibits the function of changing the support state following the change in the posture of the seated person. On the other hand, as shown by an imaginary line in FIG. 13, when the opening / closing operation body 65c is operated to the closed position c and the opening / closing valve 65 is switched to the shut-off state, both the fluid bags 59, 61 are locked in a desired deformation state. Will be. That is, when the back support fluid bag 59 is reduced and the waist support fluid bag 61 is locked in a swelled state, the seating surface 5a of the backrest 5 holds the seated person in a tilted posture, and a relaxed posture or It is possible to maintain a posture suitable for stretching and the like. On the other hand, when the waist supporting fluid bag 61 is contracted and the back supporting fluid bag 59 is inflated and locked, the seating surface 5a of the backrest 5 holds the posture of pushing the seated person's back forward. It becomes possible to maintain a posture suitable for work. Of course, both the fluid bags 59 and 61 can be locked at the intermediate desired position between the two positions described above. Even in the locked state, air flow and volume changes in the fluid bags 59 and 61 can occur, so that the fluid bags 59 and 61 can individually exhibit a cushion function.

  In addition, the air in the fluid bags 59 and 61 may gradually leak to the outside as in the seat 4 described above, and an appropriate bulge of the fluid bags 59 and 61 cannot be obtained after a long period of use. . In that case, the opening / closing valve 65 is opened and a state in which no load is applied to the seating surface 5a of the backrest 5 is maintained, and then the release operation body 67c is pressed to the release position to open the release valve 67. To do. As a result, the fluid chambers 59 b and 61 b of both the fluid bags 59 and 61 are opened to the atmosphere as an external fluid existence environment via the release flow path 71. As a result, both the fluid bags 59 and 61 are inflated while sucking outside air, that is, air as fluid, by the elastic repulsion force of the internal cushion 61c accommodated therein, and self-reset to the normal reference state. When the fluid bags 59 and 61 have completely returned to the reference state, if the pressing operation to the release operation body 67c is stopped and the release flow path 71 is closed, the above-described operation is performed again. It becomes possible.

  In this embodiment, a lumbar support member 75 is interposed between the waist support fluid bag 61 and the back inner shell 55, and the vertical position of the lumbar support member 75 is changed by operating the lifting lever 77b. It is possible to adjust the sense of support of the lower back more precisely. That is, since the lumbar support member 75 is in sliding contact with the back surface of the waist supporting fluid bag 61, the lumbar support member 75 is conspicuous in appearance on the seating surface 5a of the backrest 5 even if the position of the lumbar support member 75 is changed. No change will occur. However, the feeling of repulsion given to the seated person from the waist supporting fluid bag 61 increases in the vicinity of the position where the lumbar support member 75 exists, and the hold feeling of the waist is adjusted by adjusting the position of the lumbar support member 75. It becomes possible.

  By setting it as the above structures, since the chair which concerns on this embodiment has distribute | arranged the fluid bags 31, 33, 59, 61 so that it may adjoin on both sides of the boundary k1, k11, the fluid bag 31, 33, 59, 61 is expanded or contracted in the direction toward the boundaries k1, k11, that is, the cushion function is suppressed, and the fluid bags 31, 33, 59, 61 are directed toward other directions including a desired direction in which the cushioning function is desired. The structure is easy to deform. By doing so, the fluid bag 31, 33, 59, 61 can be made to act on the seating surfaces 4 a, 5 a by further improving the cushion function in the required direction. As a result, it is possible to provide a chair that can more suitably support a seated person.

  In particular, in this embodiment, the exterior materials 29 and 57 are disposed so as to surround the fluid bags 31, 33, 59, and 61, thereby forming boundaries k 1 and k 11 between the fluid bags 31 and 33 and 59 and 61. In addition, by forming boundaries k2, k3, k4, k5 and boundaries k12, k13 in other parts that can contact the fluid bags 31, 33, 59, 61, the fluid bags 31, 33, 59, 61 are formed. Can project into and out of the seating surfaces 4a and 5a. Of course, the lower side of the fluid bags 31 and 33 and the rear of the fluid bags 59 and 61 are in contact with the seat inner shell 27 or the back inner shell 55. As a result, the fluid bags 31, 33, 59 and 61 of this embodiment are It can effectively project and retract only in the direction facing the seating surfaces 4a and 5a.

  And in this embodiment, in order to exhibit the effect mentioned above more effectively by drawing in more exterior materials, exterior material 29,57 is seat inner shell 27 which arranged fluid bag 31,33,59,61 or The back inner shell 55 is configured to cover substantially the entire one surface.

  In particular, in the present embodiment, the exterior materials 29 and 57 are provided with external cushions 29a and 57a such as molded urethane, and tension fabrics 29b and 57b mounted on the surface side of the external cushions 29a and 57a. By pulling in the outer cushion strongly by pulling in 29b and 57b, the location of the outer cushion pulled in as the boundaries k1 and k11 is locally hardened, so that the boundary k1 of the fluid bags 31, 33, 59, and 61 is more preferable. , K11 can be suppressed from expanding and contracting.

  In this embodiment, grooves k1m and k11m are provided on the surfaces of the external cushions 29a and 57a in the direction of the seat inner shell 27 or the back inner shell 55 in order to carry out the retracting positions of the exterior materials 29 and 57 more accurately. It is assumed that the stretched fabrics 29b and 57b are accommodated in the grooves k1m and k11m to form the boundaries k1 and k11. Further, by disposing the walls k1k and k11k that are firmly formed by the external cushions 29a and 57a drawn to form the walls k1k and k11k at portions corresponding to the grooves k1m and k11m on the back surface of the outer cushion, The expansion / contraction of the fluid bag 31, 33, 59, 61 is suppressed by the area. Further, the walls k1k and k11k are formed firmly, so that the deformation of the fluid bags 31, 33, 59 and 61 in the required direction, that is, the seating surfaces 4a and 5a can be promoted.

  In this embodiment, in order to secure the seats 29b, 57b to the seat inner shell 27 or the back inner shell 55 while ensuring a seating feeling, the fabrics 29b, 57b are attached to the fluid bags 31, 33, 59, 61. Is arranged so as to cover one surface of the seat inner shell 27 or the back inner shell 55, that is, substantially the entire upper surface or front surface, and the edges of the stretched fabrics 29b, 57b are disposed on the fluid bags 31, 33, 59, The seat 61 is fixed to the lower or rear surface of the seat inner shell 27 or the back inner shell 55.

  In the present embodiment, the outer cushions 29a, 57a are arranged so as to surround the fluid bags 31, 33, 59, 61, so that the fluid bags 31, 33, and the fluid bags 59, 61 are formed. Not only the walls k1k and k11k corresponding to the boundaries k1 and k11 but also the walls k2k, k3k, k4k, k5k, k12k and k13k that are rigidly formed corresponding to the other boundaries k2, k3, k4 and k5 and the boundaries k12 and k13. Therefore, the deformation of the external cushions 29a and 57a in the surface direction of the seating surfaces 4a and 5a is effectively restricted, and the fluid bags 31, 33, 59 and 61 are likely to act only on the seating surfaces 4a and 5a. .

  Further, in the present embodiment, the seating surfaces 4a and 5a can be deformed more quickly by providing the communication channels 39 and 69 and performing the deformation of the plurality of fluid bags 31, 33, 59, and 61 in synchronization. It has become.

  Here, in the present embodiment, in order to effectively avoid the communication channels 39 and 69 from interfering with the fluid bags 31, 33, 59 and 61 and the external cushions 29 a and 57 a, the seat inner shell 27 or the back inner shell 55. Further, passages 27c and 55c for inserting the communication passages 39 and 69 are provided. As another configuration of this passage, in addition to providing the passages 27c and 55c in the seat inner shell 27 or the back inner shell 55 itself as in the above embodiment, for example, in the seat inner shell 27 or the back inner shell 55, adjacent spaces When the partition for separating each other is provided, the partition may be provided on the partition. At that time, the passages 27c and 55c have tunnel portions 27d and 55d as flow path protection portions that can protect the communication flow paths 39 and 69 from being deformed by a seating load applied to the seat inner shell 27 or the back inner shell 55. As a matter of course, the communication channels 39 and 69 can be arranged at required positions while ensuring the fluid flow.

  In the present embodiment, the communication channels 39 and 69 are formed by utilizing the space between the seat outer shell 23 and the seat inner shell 27 and the space between the back outer shell 51 and the back inner shell 55, The smooth distribution and the smooth movement of the chair itself are effectively balanced.

  Thus, in this embodiment, by arranging the seat unit 25 and the back unit 53 having the above-described boundaries k1k and k11k, the fluid bags 31, 33, 59, and 61 ensure the function as an existing chair. A chair that can fully enjoy the effects obtained is realized.

<Modification 1>
Then, each modification of this embodiment is explained in full detail. In the modified example, components corresponding to the components according to the embodiment are given the same reference numerals, and detailed description thereof is omitted.

  In the above embodiment, the aspect in which the seat unit 25 and the back unit 53 are configured by attaching the fluid bags 31, 33, 59, 61 to the inner shells 27, 55 of the back seat is disclosed, but this modification shown in FIGS. By attaching the fluid bag 31, 33, 59 directly to either or both of the outer shells 23, 51 of the back seat where the outer surface is exposed, in order to further simplify the assembly work and reduce the number of parts as in the example The seat unit 125 or the back unit 153 may be configured.

  That is, as shown in FIG. 17, the seat unit 125 includes a seat outer shell 23 that functions as a shell or a unit board in this modification, and an exterior material 29 that covers the surface side of the seat outer shell 23. Therefore, between the seat outer shell 23 and the exterior member 29, a fluid bag 31 for supporting the thigh that expands and contracts by the introduction and introduction of air, which is a fluid, and a fluid bag 33 for supporting the buttocks are interposed. At the same time, a seat fluid control device 91 is attached to the seat outer shell 23 in order to control the flow of fluid into and out of the fluid bags 31 and 33. These fluid bags 31 and 33 are connected to each other through a communication channel 39 that is opened and closed by an on-off valve 35, as shown in FIG. It can be opened to the atmosphere as an external fluid existence environment via a release flow path 41 opened and closed by a release valve 37. These valves 35 and 37 constituting the seat fluid control device 91 are attached to the seat outer shell 23 by appropriate means.

  As shown in FIG. 18, the back unit 153 includes a back outer shell 51 that functions as a shell or a unit substrate in the present modification, and an exterior material 57 that covers the surface side of the back outer shell 51. Thus, between the back outer shell 51 and the exterior member 57, a back support fluid bag 59 that expands and contracts by the introduction and introduction of air, which is a fluid, and a waist support fluid bag 61 are interposed. These fluid bags 59 and 61 are connected so as to be able to communicate with each other through a communication channel 69 opened and closed by an on-off valve 65, as shown in the figure and the above-described embodiment. It can be opened to the atmosphere as an external fluid existence environment via a release flow path 71 opened and closed by a release valve 67. These valves 65 and 67, which are fluid control devices, are attached to the back outer shell 51 by appropriate means.

<Modification 2>
Further, as in the present modification shown in FIG. 19, the back unit 53 mainly composed of the back inner shell 55 similar to the above-described embodiment may be configured to be movable with respect to the back outer shell 51, for example, in the vertical direction. In this case, as a specific configuration for moving the back unit 53 up and down with respect to the back outer shell 51, various existing configurations can be used.

  If this is the case, the fluid bag placed on the back unit and the lumbar support 6 built in the back unit will be placed in the most suitable position for the seated person, depending on the physique and posture of the seated person. To gain. In particular, the back unit 53 is in a state where the members related to the fluid bags 59 and 61, that is, the back fluid control device 93 and the like are included in the back unit 53 and moves up and down together with the back inner shell 55. In addition, it is possible to effectively avoid that each flow path 69, 71 etc. interferes with other members of the spine unit 53, and as a result, it is adapted to the physique of the seated person without impairing the action of both fluid bags 59, 61. The above-described effects can be obtained.

  As mentioned above, although embodiment of this invention was described, the specific structure of each part is not limited only to embodiment mentioned above, It does not deviate from the meaning of this invention like each modification described below. Various modifications are possible within the range.

For example, although the aspect which draws in an exterior material with a wire as an aspect which draws in an exterior material was disclosed in the said embodiment, it is good also as what pulled in, for example, combining the rod-shaped member and board | plate material with the wire. Specifically, the rod-shaped member is arranged by a groove provided in the external cushion, and both ends of the rod-shaped member are drawn by the wire material, or the plate material is arranged on the stretched ground and the plate material is drawn by the wire material. May be. In the above embodiment, the exterior material is drawn by the wire material to form a continuous boundary. However, for example, the exterior material can be made to be a boundary formed in a substantially broken line shape by intermittently or intermittently drawing the exterior material. Is,
In the above embodiment, a plurality of fluid bags having different capacities are connected, or even if there is no large difference in capacity, for example, by changing the shape depending on the presence or absence of a standing wall, etc. Although the case where the thickness change rate is varied between the fluid bags is described, the present invention is not limited to such a configuration. However, if the thickness change rate is made different between the fluid bags as in this embodiment, for example, it is better to make the change in expansion / contraction of the fluid bag stronger like the lumbar support part. A thing with a large thickness change rate can be placed, and a part with a small thickness change rate can be placed in the part where the change in expansion and contraction of the fluid bag does not need to be felt so much, and a comfortable holding feeling can be obtained as a whole chair. It becomes possible.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 is an overall perspective view showing an embodiment of the present invention. The whole perspective view which shows the back side of the embodiment. The exploded perspective view of the embodiment. The disassembled perspective view which shows the seat of the embodiment. The perspective view which shows the external cushion of the seat in the embodiment from the lower surface side. The partial expanded sectional view of the seat in the embodiment. The bottom view which shows the fluid bag of the seat in the embodiment. XX sectional drawing in FIG. The disassembled perspective view which shows the inner shell of the seat in the embodiment from the lower surface side. The disassembled perspective view which shows the backrest of the embodiment. The perspective view which shows the external cushion of the backrest in the embodiment from the back side. The partial expanded sectional view of the backrest in the embodiment. The rear view which shows the backrest fluid bag in the same embodiment. The YY sectional view taken on the line in FIG. The partial expansion perspective view which shows the inner shell of the backrest in the embodiment from the back side. The fragmentary sectional view which shows the lumbar support part of the backrest of the embodiment. The disassembled perspective view which shows the seat unit of the modification 1 of the embodiment. FIG. 6 is an exploded perspective view showing a back unit of the first modification. The whole perspective view which shows the modification 2 of the embodiment.

Explanation of symbols

4a, 5a ... Seating surface 27 ... Shell, seat inner shell (seat inner shell)
55 ... Shell, back inner shell (back inner shell)
27c, 55c ... passage 27d, 55d ... flow path protection part (tunnel part)
29, 57 ... exterior materials 29a, 57a ... external cushions 29b, 57b ... tension 31 ... fluid bag (fluid bag for supporting the thigh)
33 ... Fluid bag (fluid bag for supporting the buttocks)
59 ... Fluid bag (back support fluid bag)
61. Fluid bag (fluid bag for supporting the waist)
39, 69 ... communication channel k1, k11 ... boundary k1m, k11m ... groove k1k, k11k ... wall

Claims (14)

A shell for receiving a load acting on the seating surface, a plurality of fluid bags attached to the shell to perform a cushioning function, and covering substantially the entire one surface of the shell so as to cover these fluid bags A chair comprising an external cushion such as molded urethane attached so as to hide and an exterior material provided with a tension material attached to the surface side of the external cushion , wherein a predetermined portion of the exterior material is drawn into the shell side A boundary is formed, and the fluid bag is arranged so as to be adjacent to each other across the boundary ,
A groove is provided on the surface of the external cushion, and the drawing wire attached to the surface side of the stretch fabric is drawn in the shell direction so that the draw wire is immersed in the groove together with the stretch fabric to form the boundary. A chair characterized by that. The chair according to claim 1, wherein the lead-in wire is drawn in using a string penetrating the external cushion and the shell . The chair according to claim 1 or 2, wherein a wall is formed at a portion corresponding to the groove on the back surface of the external cushion . The upholstery covers the substantially whole surface of one side of the shell on which the fluid bag is arranged, and the edge of the upholstery is opposite to the one side of the shell on which the fluid bag is arranged. The chair according to claim 1, 2 or 3, which is fixed to the chair. Before the Kigaibu cushion, it arranged to have claimed請1, 2, 3 or 4 chair according to surround the periphery of said fluid bag. The chair according to claim 1, 2, 3, 4 or 5, wherein the external cushion is disposed between the plurality of fluid bags . 7. A communication channel for communicating the plurality of fluid bags is further provided, and the shell has a passage for inserting the communication channel. The listed chair. The communication channel is disposed in a region that receives a seating load on the shell, and the passage includes a channel protection unit that can protect the communication channel in a region that receives the seating load. The chair according to claim 7 . The chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the shell is a seat inner shell supported by a seat outer shell . The chair according to claim 9, wherein the seat inner shell is detachably attached to the seat outer shell . The chair according to claim 9 or 10, wherein the seat inner shell is arranged to be slidable back and forth . The chair according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, wherein the shell is a back inner shell supported by a back outer shell . The chair according to claim 12, wherein the back inner shell is detachably attached to the back outer shell . The chair according to claim 12 or 13, wherein the back inner shell is disposed so as to be vertically movable with respect to the back outer shell .

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