JP2005279064A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair for which a power unit can be operated accurately corresponding to the prescribed sitting state of a user. <P>SOLUTION: In this chair 1, a sitting switch 64 is provided with an actuator 642 arranged at a prescribed position relative to a cushion body 303 corresponding to a sitting position so as to respond to the elastic deformation of the cushion body 303 corresponding to sitting or leaving to/from the prescribed sitting position by the user and a switch main body 641 for switching the ON/OFF of a power source part 62 corresponding to the operation of the actuator 642. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chair provided with a power supply device.

  Conventionally, the chair body is provided with a mechanical device that operates with electric power, and for example, a power supply device that energizes the mechanical device with electric power from a household power supply or the like is provided, and by using the electric power supplied by the power supply device, the machine Chairs to which various functions are added depending on the device have been proposed. Most of these chairs operate the power supply device by operating a power switch provided at a position where the user can be operated while seated. For example, in the chair described in Patent Document 1, by turning on a power switch provided below the chair seat in order to energize the power supply device, the power supply is turned on / off, that is, the power supply device is turned on or off. The energized state is switched.

On the other hand, among chairs equipped with a power supply device, a chair that detects the seating by lowering the entire upper surface of the seat by a user's seating and energizes the power supply device has been devised.
JP 2003-38286 A

  However, in the case of a chair that is switched between an energized state or a non-energized state of a power supply device by a power switch as represented by Patent Document 1, not only a procedure for operating the switch when energizing the power supply device is essential, Since the energized state continues unless the user operates the power switch again to turn off the power, if the user accidentally leaves the seat while being energized, the power is wasted. .

  Further, in the case of a chair that is energized by sinking the entire upper surface of the seat by the user's seating load as described above, a space for sinking the upper surface of the seat must be provided separately in the seat. Furthermore, based on a structure in which the entire upper surface of the seat responds to the seating load, the power supply device is energized when the upper surface of the seat descends regardless of the seating posture of the user. Even when a part of the upper surface of the seat is pressed by hand or when the user sits lightly, the entire upper surface of the seat descends and becomes energized. In such a case, especially when the seat or the back of the chair performs a predetermined operation, the chair may be unnecessarily and unexpectedly operated.

  The present invention focuses on such problems as described above, and the main object of the present invention is to provide a chair in which the power supply device functions in a precise manner corresponding to a predetermined seating state of the user. is there.

  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 chair body having an elastically deformable cushion body for supporting the seating load of the user, a power supply device attached to the chair body, and an energized state of the power supply device Or a switch device that switches a non-energized state, wherein the switch device is elastically deformed of the cushion body corresponding to seating or leaving by a user to a predetermined seating position in the chair body. An actuator disposed at a predetermined relative position with respect to the cushion body corresponding to the seating position, and a switch for switching between an energized state and a non-energized state of the power supply device corresponding to the operation of the actuator And a main body.

  In such a case, since the switch device switches between the energized state and the non-energized state of the power supply device only by the operation of the actuator due to the bending based on the elastic deformation of the cushion body, the user is consciously energized. There is no need to switch between the non-energized state. Further, since the operating element responds only when the user is seated at a predetermined seating position, it is possible to effectively avoid a malfunction that the power supply device is energized unnecessarily and unexpectedly. Furthermore, in order to operate the switch device on the chair body, the space necessary for the interior of the chair when operating the switch device can be limited to the space required for the operation of the actuator in addition to the space for providing the switch body. Since there is no need to provide a space for operating the entire upper surface of the seat in the chair, it is possible to provide a compact chair that suppresses unnecessary bulkiness.

  In order to make the presence of the actuator inconspicuous in appearance, it is desirable that at least a part of the actuator is arranged in a state where it is not exposed on the seating surface side of the cushion body, and it is further desirable. Can include those in which at least a part of the actuator is inserted into a recess formed by opening the cushion body on the non-sitting surface side.

  In order to energize the power supply device only when a sufficient seating load is applied according to a predetermined seating posture, the switch is separated from the switch body by a predetermined distance when the user is not seated at the seating position. It is preferable that a contact portion that contacts the switch body is formed when the operating member is operated by the user sitting at the seating position.

  In order to prevent the load applied to the actuator from affecting the switch body, a tapered surface that is inclined with respect to the operation direction of the actuator is formed at the contact portion, and the taper surface is the operation direction of the actuator. It is desirable that the switch body is configured to come into contact with the switch body from different directions.

  In order to effectively improve the degree of freedom in designing the switch device, the operating element is a rod-shaped member, and one end side is positioned in the cushion body and the other end side is positioned outside the cushion body. Thus, it is desirable that the contact portion is formed on the other end side.

  In addition, in order to attach the actuator to a desired position with respect to the chair, the chair body having the cushion body therein and the seat portion for the user to sit from above, the actuator is attached to the seat portion. What is attached to the said predetermined relative position with respect to the said cushion body which has is desirable.

  Further, if the chair according to the present invention is such that the power supply device supplies power to a swing mechanism that swings the seat when a user is seated at the predetermined seating position, the chair is not in a predetermined posture. This is desirable because it is possible to effectively avoid the erroneous operation of the seat swinging due to the seating in the seat, and further, the erroneous operation of operating the actuator due to the movement of the seating load of the user due to the swinging is effectively avoided. In order to achieve this, the rocking mechanism includes a rocking fulcrum that supports a predetermined portion of the seat from below and serves as a fulcrum for the rocking motion of the seat. It is preferable if it is arranged in the vicinity of the dynamic fulcrum.

  According to the present invention, the actuator responds to the elastic deformation of the cushion body corresponding to the seating or leaving by the user, and the switch body responds to the operation of the actuator between the energized state and the non-energized state of the power supply device. Therefore, it is not necessary for the user to consciously switch between the energized state and the non-energized state. Further, since the operating element responds only when the user is seated at a predetermined seating position, it is possible to effectively avoid a malfunction that the power supply device is energized unnecessarily and unexpectedly. Furthermore, in order to operate the switch device on the chair body, the space necessary for the interior of the chair when operating the switch device can be limited to the space required for the operation of the actuator in addition to the space for providing the switch body. Since there is no need to provide a space for operating the entire upper surface of the seat in the chair, it is possible to provide a compact chair that suppresses unnecessary bulk.

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

  A chair according to this embodiment is shown in FIG. The chair 1 includes a leg portion 2 including leg blades 21 having casters C and leg posts 22, a seat body 30 that receives a seating load by a seated person, and a seat receiver 31 that supports the seat body 30 from below. A back part 4 supported by the leg part 2 and supported at the lower end by a pair of support frames F rising from the side of the seat part 3, and a pair of standups rising from the pair of support frames F And an armrest portion 5.

  In addition, the chair 1 according to the present embodiment employs a tilt mechanism that tilts backward with the circular member F1 in the support frame F as an axis without interlocking with the seat portion 3 when the back portion 4 is tilted backward.

  And the chair 1 which concerns on this embodiment is a rocking | fluctuation mechanism which rocks the seat part 3 by fluctuating the angle which the seat part 3 makes with a fixed period as a part of leg part 2 which does not depend on the seat part 3. FIG. 6 is used to assemble the leg 2 and the seat 3. Hereinafter, the configuration of the chair 1 will be described in detail with reference to FIGS. 2, 3, 4, 5, 6, and 7. In the present embodiment, a decorative case that covers the seat receiver 31 and the swing mechanism 6 is not shown below the seat portion 3. Further, the support frame F is not shown in FIG.

  As shown in FIG. 2, the seat portion 3 includes a seat body 30 and a seat receiver 31.

  The seat main body 30 forms the outer shape of the seat portion 3, covers the lower surface of the seat main body 30 and is supported by the seat receiver 31, and is disposed inside the seat main body 30. An elastically deformable cushion body 303 supported by the seat plate 302 from below is provided. Further, two through holes 302a are formed in the vicinity of the center of the seat plate 302, and two concave portions 303a are formed on the cushion body 303 at positions communicating with the through holes 302a, that is, on the non-sitting surface side of the cushion body 303. Is forming. Therefore, the upper surface side of the cushion body 303 in which the concave portion 303a is formed is set as a predetermined seating position for the user.

  The seat receiver 31 is composed of a seat receiver body 310 formed by welding and bending a steel plate, for example, and a spacer 311.

  The seat receiving body 310 is provided with a front wall 310a that erects forward and a pair of side walls 310b that erect sideways so as to cover the mechanism case 630, and the pair of side walls 310b are substantially in the front-rear direction. A supported hole 311 located at the center, an opening 312 located slightly in front of the supported hole 311, and two female screw holes 312 a located above the opening 312 are provided.

  In addition, the spacer 313 is a block having an L shape in cross section made of a high strength metal such as a baked steel material. As shown in FIG. 7, a bolt b is used at the position of the female screw hole 312a. A spacer 313 is attached to the upper side 312 b of the opening 312.

  The swing mechanism 6 includes a vertical movement unit 60, a drive unit 61, a power supply unit 62, and a mechanism case 63. Specifically, the mechanism case is fixed on the leg column 22 so as to be rotatable in the horizontal direction. 63, a vertical operation unit 60, a drive unit 61, a power supply unit 62, and a seating switch 64 are assembled inside or outside.

  The power supply unit 62 includes a battery 621 fixed to the rear portion of the mechanism case 63, a power switch 622 exposed from the side of the mechanism case 63, and a connector 623. The connector 623 is connected to an AC adapter (not shown). The battery 621 is charged by being connected to a household 100V outlet, and the charged power is supplied to the drive unit 61. The power supply to the drive unit 61 is turned on / off of the power switch 622. It is assumed that the operation is OFF.

  The chair 1 according to the present embodiment includes a seating switch 64 in addition to the power switch 622 described above, and only when the power switch 622 and the seating switch 64 are both turned on, the driving unit 61. It is supposed to supply power to

  The seat switch 64 has an upper end protruding above the mechanism case 63 and a lower end accommodated in the mechanism case 63, and a switch disposed close to the lower end of the actuator 642. The main body 641, the operating element 642, and the switch main body 641 are configured by an attachment portion 643 that attaches to a support plate 634 fixed to the mechanism case 63.

  The switch main body 641 operates according to the movement of the main body 641a fixed inside the mechanism case 63, the operating piece 641b in contact with the operating element 642, and the operating piece 641b, thereby changing the ON / OFF state of the switch main body 641. And an operation button 641c to be determined.

  The actuator 642 includes a rod-shaped actuator main body 642a, a pressure receiving portion 642b positioned at the upper end of the actuator main body 642a, and a pressing portion 642c positioned at the lower end. The switch main body 641 is included in the pressing portion 642c. A tapered surface 642d is formed by cutting the surface with respect to the diagonally downward direction.

  The mounting portion 643 is a metal plate having an inverted L shape when viewed from the side. The mounting plate 643d is fixed to the support plate 634 by screws at the upper horizontal portion of the metal plate and fixes the switch body 641 at the lower vertical portion. And a first support pipe 643a that is fixed on the upper side of the mounting plate 643d and guides the operation of the operating body 642a, and an acting force that is provided between the mounting plate 643d and the pressure receiving portion 642b and pushes up the operating device 642 upward. And a second support pipe 643c that is fixed below the support plate 634 and guides the operation of the actuator body 642a together with the first support pipe 643a.

  The drive unit 61 includes a motor 610 housed in the mechanism case 63, a drive gear 611 attached to the drive shaft of the motor 610, and a driver (not shown) attached to a control board (not shown). In this embodiment, the motor 610 employs a DC brushless motor. When the power supplied from the power supply unit is supplied to the driver, the driver applies an alternating current whose current and frequency are controlled to drive the motor 610 to the motor 610. Further, the driver has a function of detecting a load applied to the motor 610 and controlling a current and a frequency to be supplied in real time. The driving force by the motor 610 is transmitted to the up / down motion unit 60 via the driving gear 611.

  The vertical movement unit 60 is deviated from the reduction gear 601 to which the driving force of the motor 610 is transmitted via the drive gear 611, the main shaft 602 rotated by the reduction gear 601, and the central shaft 602 a of the main shaft 602. A rotating shaft 603 serving as a sub-axis disposed at a position and a rotating member 604 having a circular shape in a longitudinal sectional view around the central axis 603a of the rotating shaft 603, that is, a circular shape in a side view, are provided.

  The reduction gear 601 employs a gear having a larger number of teeth than the drive gear 611 described above, thereby appropriately reducing the rotational speed of the motor 610, improving the torque, and driving desirable for swinging the seat portion 3. It is transmitted to the main shaft 602 as a force. Here, in this embodiment, the gear ratio of the drive gear 611: the reduction gear 601 is set to 1: 3.

  The main shaft 602 transmits the driving force transmitted by the reduction gear 601 to the rotating members 604 located on both sides of the mechanism case 63, and the bearing holes 631 provided in the mechanism case 63 via the bearing members 632. It is supported. Specifically, the bearing member 632 includes a rotating portion 632a that rotates together with the main shaft 602, and a fixing portion 632b that is fixed to the mechanism case 63 and supports the rotating portion 632a so as to be rotatable. A bearing 632c, which is a sliding member, is provided between the rotating portion 632a and the fixed portion 632b, thereby reducing a driving force loss due to friction when the main shaft 602 rotates.

  As described above, the rotation shaft 603 serving as the auxiliary shaft is attached at a position deviated with respect to the main shaft 602, and is disposed around the rotation shaft 603 along the outer periphery. A contact ring 604a that is an outer periphery of the moving member 604 is attached, and the contact ring 604a is rotated between the rotation shaft 603 and the contact ring 604a between the rotation shaft 603 and the contact ring 604a as described above. Similar to the bearing member 632, a bearing 604b which is an idling member is provided.

  The mechanism case 63 is, for example, a die-cast box, and as described above, the bearing hole 631 is formed and the bearing member 632 is disposed, and the support member 633 for supporting the seat receiver 31 is provided on both sides. It is attached to. As described above, the seating switch 64 is supported by attaching the support plate 634 to the upper part.

  Then, the swing mechanism 6 and the seat portion 3 form a support portion A by pivotally attaching a support member 633 attached to the mechanism case 63 and a supported hole 311 provided in the seat receiving body 310. The upper surface of the contact ring 604a of the rotating member 604 is assembled to the spacer 313 attached to the seat receiving body 310 from below.

In this state, as shown in FIG. 3, the seating switch 64 as a switch device serves as a swing fulcrum for the actuator 642 so as to correspond to the seating or leaving of the chair 1 to a predetermined seating position by the user. It is arranged at a position slightly behind the support portion A. In addition, as shown in FIG. 4, the pressure receiving portion 642 b is positioned in the cushion body 303 by inserting the pressure receiving portion 642 b into the recess 303 a of the cushion body 303 so as to respond to the elastic deformation of the cushion body 303. The upper end of the pressure receiving part 642b is arranged in a state where it is not exposed to the seating surface side of the cushion body 303. Then, the actuator main body 642a is passed through the through hole 302a provided in the seat plate 302, the pressing portion 642c is positioned inside the mechanism case 63, and the switch main body 641 is disposed at a position close to the pressing portion 642c. ing.
FIG. 4 shows a state in which the user is not seated. In this state, the spring 643b pushes up the pressure receiving portion 642b and the pressing portion 642c comes into contact with the lower end of the second support pipe 643c. The pressing portion 642c is in a state of being separated from the operating piece 641b by a predetermined interval.

  Next, the operation of the seating switch 64 responding to the bending of the cushion body 303 when the user sits on the seat 3 will be described in detail with reference to FIGS. When the user is seated at a predetermined position of the seat portion 3 from the state where the user is not seated (FIGS. 4 and 5A), the cushion body 303 is positioned in response to the bending of the cushion body 303. The pressure receiving portion 642b pushes down the spring 643b and moves downward, so that the tapered surface 642d of the pressing portion 642c abuts against the operating piece 641b in an obliquely upward direction (FIG. 5B). Then, when a load is applied as it is and the operating element 642 is pushed down, the operating piece 641b is pushed out laterally by the tapered surface 642d and the switch body 641 is turned on by pressing the operating button 641c attached to the main body 641a. It becomes a state. As a result, power is supplied from the power supply unit 62 to the drive unit 61.

  The operation of the swing mechanism 6 connected to the seat 3 in this manner swinging the seat 3 will be described with reference to FIGS. 3, 8, and 9.

  First, in a state in which only the power switch 622 of the power supply unit 62 is turned on, a standby state in which whether or not power can be supplied depends on the seating switch 64 is set. When the seat switch 64 is turned on as described above in response to the user sitting at a predetermined position from the standby state, the electric power stored in the battery 621 drives the motor 610 through the driver. The driving force of the motor 610 is transmitted to the main shaft 602 through the driving gear 611 and the reduction gear 601, and the main shaft 602 rotates while being supported by the mechanism case 63. Then, as shown schematically in FIGS. 8A, 8 </ b> B, 8 </ b> C, and 8 </ b> D, the rotation member 604 moves along the rotation shaft 603 as the main shaft 602 rotates. The central shaft 603a rotates in a perfect circle around the central shaft 602a of the main shaft 602, and rotates around the rotating shaft 602 while moving the chair in the front-rear direction and the vertical direction. At this time, the contact ring 604a of the rotating member 604 is always in contact with the spacer 313 attached to the seat receiving body 310, and the contact portion p between the abutment ring and the spacer 313 moves in the front-rear direction, and the spacer 313 The position moves substantially up and down following the operation of the rotating member 604. To be precise, as shown in FIG. 9, the spacer 313 and the seat receiver 31 to which the spacer 313 is attached reciprocate from the position indicated by the solid line to the position indicated by the broken line with the support portion A as a fulcrum. I do. That is, the support body 31, that is, the seat body 30 and the support body 31 are swung up and down with the support portion A as a fulcrum. In addition, since the contact ring 604a is attached to the rotating shaft 603 via the bearing 604b as described above, the movement of the contact ring 604a with respect to the spacer 313 rolls back and forth with almost no friction. It has become.

  As described above, in the chair 1 according to the present embodiment, the seat switch 64 as the switch device has the elastic deformation of the cushion body 303 corresponding to the seating or leaving by the user to the predetermined seating position in the chair 1 as the chair body. The actuator 642 disposed at a predetermined relative position that responds to the operation, and the ON state, which is an energized state, and the OFF state, which is a non-energized state, for the drive unit 61 of the power supply unit that is a power supply device corresponding to the operation of the actuator A switch main body 641 for switching between and.

  With such a configuration, the seat switch 64 switches between the ON / OFF states of the power supply unit 62 only by the operation of the actuator 642 caused by the bending based on the elastic deformation of the cushion body 303. There is no need to perform the operation of switching between / OFF. In addition, since the operating element 642 responds only when the user is seated at a predetermined seating position, it is possible to effectively avoid unnecessary and unexpected malfunctions in which the power supply unit is turned on. In other words, when the user sits down at a position different from the seating position, the actuator 642 does not operate correctly, and the seat portion 3 does not swing. Furthermore, the space required inside the chair 1 when operating the seating switch 64 can be limited to the space required for the operation of the actuator 642 in addition to the space for providing the switch body 641. Since it is not necessary to provide a space in the chair 1 for operating the entire upper surface of the seat 3 in order to operate the device 64, a compact chair can be obtained. Furthermore, the feeling that the actuator 642 gives to the user when the user operates the actuator 642 by the seating load is mixed with the feeling that the user presses the cushion body 303, so that the user feels more natural sitting. Can be given.

  Further, since the pressure receiving portion 642b of the operating element 642 is disposed in a state where it is not exposed to the seating surface side of the cushion body 303, the presence of the operating element 642 is from the outside in appearance. In particular, a part of the pressure receiving portion 642b and the actuator main body 642a is inserted into the recessed portion 303a formed to be opened on the non-sitting surface side of the cushion body 303, thereby making the appearance inconspicuous and stable operation. And both.

  The pressing portion 642c, which is a contact portion, is separated from the switch main body 641 by a predetermined interval when the user is not seated, and the switch is activated when the operator 642 operates by seating at the seating position. Since the power supply unit 62 can be configured to be turned on only when a sufficient seating load is applied in a predetermined seating posture because it is in contact with the main body 641, a slight amount of the actuator 642 other than the predetermined seating posture can be obtained. It is possible to effectively prevent an erroneous operation of detecting the movement and turning it on. Particularly, since the pressing portion 642c is provided with a tapered surface 642d and is in contact with the switch body 641 from a direction different from the operation direction of the actuator 642, the switch body 641 is installed on an extension line of the operation direction of the actuator 642. This avoids this problem and effectively avoids problems such as the seat load applied to the actuator 642 damaging the switch body 641.

  The actuator 642 is mainly composed of an actuator body 642a that is a rod-shaped member, and a pressure receiving portion 642b is provided on one end side to be positioned in the cushion body 303 and the other end side is positioned outside the cushion body 303, Since the pressing portion 642c serving as a contact portion is provided on the other end side, the degree of freedom in design for setting the seating switch 64 is effectively improved.

  Moreover, in the chair 1 which concerns on this embodiment which is a chair main body, it has become suitable as a location where a seating load is most easily applied by attaching the operation element 642 to the seat part 3. Since the seating switch 64 supplies power to the swing mechanism 6, the user is not required to perform another operation to swing the seat 3, but only by taking a predetermined seating posture. The swing mechanism 6 can be operated. Further, since the seat portion 3 is swung only in a predetermined seating posture, it is possible to effectively avoid a malfunction that the seat swings due to the seating in a posture other than the predetermined posture.

  Further, since the operating element 642 is disposed in the vicinity of the support portion A which is the swing fulcrum of the swing mechanism 6, the movement of the seat portion 3 due to the swing operation can be reduced, and the user can be seated by the swing. An erroneous operation in which the operating element 642 is moved by the movement of the load and the swinging operation is stopped is effectively avoided.

  As mentioned above, although embodiment of this invention was described, the specific structure of each part is not limited only to embodiment mentioned above.

  For example, in the above-described embodiment, the mode in which the operating element is provided on the seat portion is shown, but the position where the operating element is provided is not limited to the seat portion, and may be provided on the back portion or, in some cases, the headrest. There may be. Further, in the above embodiment, two actuators are provided and a pressure receiving portion is provided corresponding to each actuator, and the actuator operates with respect to a seating load with respect to a position where each actuator is provided. The present invention is not limited to the number of actuators or the number of pressure receiving portions corresponding to the number of actuators. For example, the pressure receiving part is provided in the upper part of the actuator as a bar-like or plate-like one extending in the horizontal direction, and the actuator and the pressure receiving part form a T shape in a side view so that not only the position of the actuator but also the periphery of the actuator The operating element may be operable with respect to a seating load with respect to a predetermined range including the above-mentioned position, and a single pressure receiving portion may be provided so as to connect the upper parts of the plurality of operating elements. Further, what the switch device supplies power is not limited to the swinging mechanism of the seat portion, and any device that swings other parts other than the seat portion or other mechanisms that require electric power can be used. Can be applied. Further, the shape of the actuator is not limited to the rod shape, and can be arbitrarily set, and the positional relationship between the actuator and the switch body can be set in various modes.

  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.

The perspective view of the chair concerning one embodiment of the present invention. The principal part side view of the chair which concerns on the same embodiment. The principal part perspective view of the chair which concerns on the same embodiment. The schematic diagram which shows the principal part of the chair which concerns on the same embodiment. Operation | movement explanatory drawing of the chair which concerns on the same embodiment. The principal part cross-sectional view of the chair which concerns on the same embodiment. The principal part longitudinal cross-sectional view. Operation | movement explanatory drawing of the chair which concerns on the same embodiment. Same as above.

Explanation of symbols

1 ... Chair, chair body (chair)
DESCRIPTION OF SYMBOLS 3 ... Seat part 303 ... Cushion body 303a ... Recessed part 6 ... Swing mechanism 62 ... Power supply device (power supply part)
64 ... Switch device (seat switch)
641 ... Switch body 642 ... Actuator 642a ... Bar-shaped member (actuator body)
642c ... contact part (pressing part)
642d ... Tapered surface A ... Oscillating fulcrum (support part)

Claims (9)

A chair body having an elastically deformable cushion body for supporting a seating load of a user, a power supply device attached to the chair body, and a switch device for switching an energized state or a non-energized state of the power device A chair comprising:
A predetermined relative position with respect to the cushion body according to the seating position so that the switch device is responsive to elastic deformation of the cushion body corresponding to the seating or leaving by the user to the predetermined seating position in the chair body An actuator arranged in the
A chair comprising a switch body that switches between an energized state and a non-energized state of the power supply device in response to the operation of the actuator. The chair according to claim 1, wherein at least a part of the actuator is arranged in a state where it is not exposed to the seating surface side of the cushion body. The chair according to claim 1 or 2, wherein at least a part of the operating element is inserted into a recess formed by opening the cushion member on the non-sitting surface side. When the user is not seated at the seating position, the actuator is spaced apart from the switch body by a predetermined distance, and the switch body is operated when the operator operates by seating at the seating position. The chair of Claim 3 which forms the contact part which contacts. The contact portion is formed with a tapered surface that is inclined with respect to the operating direction of the actuator, and the tapered surface can contact the switch body from a different direction with respect to the operating direction of the actuator. The chair according to claim 4. The operating element is a rod-shaped member, and one end side is positioned in the cushion body, the other end side is positioned outside the cushion body, and the contact portion is formed on the other end side. The chair according to claim 4 or 5. The chair body includes the cushion body inside and a seat for a user to sit from above, and the actuator is located at the predetermined relative position with respect to the cushion body of the seat. The chair according to claim 1, 2, 3, 4, 5 or 6. The chair according to claim 7, wherein the power supply device supplies electric power to a swing mechanism that swings the seat when a user is seated at the predetermined seating position. The rocking mechanism includes a rocking fulcrum that supports a predetermined portion of the seat from below and serves as a fulcrum for the rocking movement of the seat.
The chair according to claim 8, wherein the actuator is disposed in the vicinity of the swing fulcrum.

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