JP2005198979A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair having a reclining mechanism, by which an occupancy area is reduced as much as possible, while preventing the backward protrusion of a backrest part in the case of reclining and the contact position with a body such as shoulders is not changed. <P>SOLUTION: The chair comprises: a chair body having a seat surface part and the backrest part and a support part for supporting the chair body, and the reclining mechanism which moves the backrest part forward simultaneously with the backward falling in a state where an angle between the seat surface part and the backrest part is fixed constant is arranged between the support part and the chair body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a chair suitable for a massage chair or the like, and more particularly to a reclining mechanism.

  In a chair having a conventional reclining mechanism, when the backrest portion is tilted, the chair greatly protrudes backward compared to the case where the backrest portion is erected. For this reason, when placed on the wall, there is a problem that it is necessary to provide a gap between the wall and the wall assuming that the backrest portion is tilted.

  As a means for preventing such a backrest part from jumping out backward, Patent Document 1 proposes a technique for sliding the lower part of the backrest part and the seat surface part forward along the support frame when reclining.

However, the reclining mechanism described in Patent Document 1 has a configuration in which the angle of the seat surface portion is constant and only the backrest portion falls down, and the seat surface portion largely protrudes forward, and the occupied area of the entire chair is large, and there is a sufficient area. There was a problem that it could not be used unless it was in a certain space. In addition, since the shoulder position corresponding to the backrest part changes between the state where the backrest part is raised and the state where the backrest part is tilted, there is a problem that even if the shoulder position to be massaged is adjusted, the reclining angle is shifted even if the shoulder position to be massaged is adjusted. .
JP 2001-178575 A

  The present invention has been made paying attention to such a conventional problem, and when reclining, the occupation area can be reduced as much as possible while preventing the backrest portion from protruding backward, An object of the present invention is to provide a chair provided with a reclining mechanism in which a contact position of a body such as a shoulder does not change.

  In order to achieve the above object, the present invention provides a chair comprising a chair main body having a seat surface portion and a backrest portion and a support portion for supporting the chair main body from below, and between the support portion and the chair main body. In addition, a reclining mechanism is provided that moves the seat surface portion and the backrest portion forward together with the backward tilting operation of the backrest portion in a state where the angle between the seat surface portion and the backrest portion is fixed.

  The present invention also provides a reclining mechanism, a link member that connects the support portion and the backrest portion, a moving portion provided in the vicinity of the bent portion of the seat surface portion and the backrest portion of the chair body, and the moving portion in the front-rear direction. It is good also as a structure provided with the guide part assembled | attached freely, and the actuator which changes the attitude | position of a chair main body. Moreover, this moving part is good also as a structure which rolls freely along the said guide part.

  Further, the actuator may be configured to expand and contract, and one end may be connected to the moving part of the chair body and the other end may be connected to the support part.

  The actuator may be configured to expand and contract, and may be configured to connect the support portion and the seat surface portion.

  The actuator may be configured to expand and contract, and may be configured to connect the support portion and the backrest portion.

  The moving unit may be provided with wheels that are in rolling contact, and the actuator may be a rotary actuator that rotationally drives a wheel such as a rubber tire.

  Further, the present invention provides a front support leg and a rear support leg that are spaced forward and backward in the support part, and a reclining mechanism is provided along the front moving part provided on the front support leg and the seat surface part. A front guide portion provided so that the front moving portion is movably assembled in the front-rear direction; a rear moving portion provided on the rear support leg; and a rear moving portion provided along the backrest portion. It is good also as a structure provided with the rear part guide part assembled | attached freely, and the extendable actuator which connects between a chair main body and a support part, and it is good also as a structure which changes the attitude | position of a chair main body by expansion / contraction of an actuator. Further, the front moving part and the rear moving part may be configured to roll freely along the guide part.

  Moreover, the said actuator is good also as a structure which connects between the front part support leg of a support part, and the seat surface part of a chair main body. Moreover, it is good also as a structure which connects between the back part support leg of a support part and the backrest part of a chair main body.

  Further, the present invention is provided with support walls positioned on the left and right sides of the chair body in the support part, and the reclining mechanism is provided on the other of the front moving part and the rear moving part provided on one of the support wall and the chair body, The front moving part and the rear moving part are supported movably in the front-rear direction, and as the chair body moves forward, the front moving part is guided relatively upward rather than the rear moving part, and the posture of the backrest part is set backward. You may provide the guide which falls, and the extendable actuator which connects between a chair main body and a support part, and changes the attitude | position of a chair main body.

  Further, the guide may be a guide groove provided on the support wall, and the front moving part and the rear moving part may be guide convex parts that are slidably fitted into the guide groove. The front moving part and the rear moving part may be configured to roll freely along the guide.

  The guide for guiding the rear moving part has a slope that decreases toward the front, and the guide for guiding the front moving part has a slope that increases toward the front.

  The reclining mechanism may include a four-joint link mechanism that connects the seat surface portion of the chair body and the support portion, and a telescopic actuator provided in a diagonal direction of the four-joint link mechanism.

  In the reclining mechanism, a pinion disposed near the boundary between the seat surface portion and the backrest portion, and a rack disposed on the support portion and meshing with the rack may be provided.

  Moreover, you may make it this invention be used as a massage chair provided with the massage tool in the backrest part. Moreover, you may make it this invention be used as a massage chair provided with the massage device for legs in the footrest part.

According to the present invention, the reclining mechanism is provided between the support portion and the chair body so that the reclining mechanism moves forward with the backward tilting operation of the backrest portion in a state in which the angle of the seat surface portion and the backrest portion is fixed constantly. , It is possible to prevent the back portion from jumping out backward. Further, since the seat surface portion is lifted upward by the amount of the backrest portion collapsed, the forward projecting dimension of the seat surface portion is shorter than when only the backrest portion is tilted, and the occupied area can be reduced. Furthermore, even if the backrest part is tilted, the shape of the chair main body does not change, so the position of the body contacting the backrest part does not shift.

  In addition, the reclining mechanism includes a link member for connecting the support portion and the backrest portion, a moving portion provided in the vicinity of the bent portion of the seat surface portion and the backrest portion of the chair body, and a guide portion in which the moving portion is movably assembled in the front-rear direction. And an actuator that changes the posture of the chair body, the reclining operation can be performed while the position of the sitting waist remains constant.

  In addition, the actuator is configured to expand and contract, and one end is connected to the moving part of the chair body, and the other end is connected to the support part. There is no intimidation even with the cover on.

  Further, since the actuator is configured to expand and contract and is configured to connect the support portion and the seat surface portion, the movable portion can be gathered small.

Further, since the actuator is configured to expand and contract and is configured to connect the support portion and the backrest portion, it is possible to completely eliminate the rearward projection of the backrest portion during reclining.

  In addition, since the moving part is provided with a wheel that makes rolling contact, and the actuator is a rotary actuator that rotationally drives a wheel such as a rubber tire, there is no need for a special guide part and there is no possibility of pinching in the guide part. .

  In addition, the reclining mechanism is configured such that the seat surface part and the backrest part are movably assembled to the front support leg and the rear support leg that are spaced apart from each other on the support part, and the posture of the chair body is changed by expansion and contraction of the actuator. Therefore, it has a clean appearance and can be reduced in weight.

  Further, since the actuator is configured to connect between the front support leg of the support portion and the seat surface portion of the chair body, the movable portion is concentrated under the seat surface portion and is not conspicuous.

  In addition, since the support part is provided with support walls located on the left and right of the chair body, and the reclining mechanism is provided between the support wall and the chair body, a side wall is formed, the movable part is easily protected, and the safety is high. .

  Further, since the guide convex portion is slidably fitted in the guide groove, the guide can be reliably guided.

  Further, if the guide has an inclination that decreases toward the front and the guide that guides the front moving unit has an inclination that increases toward the front, the chair body can be greatly inclined.

  In addition, since the reclining mechanism is configured by the four-bar linkage mechanism and the telescopic actuator, the reclining operation can be performed with a simple configuration.

  In the reclining mechanism, since the rack and the pinion that mesh with each other are provided between the chair body and the support portion, the reclining mechanism can be reliably operated without slipping.

Moreover, when the massage tool is provided in the backrest part, the adjustment position of the massage tool does not change even if the reclining operation is performed, so there is no need to adjust the massage position again.

  The present invention will be described below based on the illustrated embodiments.

Embodiment 1
1 and 2 show a skeleton frame of a chair according to Embodiment 1 of the present invention.
1 shows the whole chair, and generally includes a chair body 4 having a seat surface portion 2 and a backrest portion 3, and a pedestal-shaped support portion 5 that supports the chair body 4. A reclining mechanism 6 is provided for moving the seat surface portion 2 and the backrest portion 3 forward together with the backward tilting operation of the backrest portion 3 in a state where the angle of the seat surface portion 2 and the backrest portion 3 is fixed constant. Yes.

A footrest portion 7 is also provided in front of the seat surface portion 2 of the chair body 4, and the backrest portion 3, the seat surface portion 2 and the footrest portion 7 are integrally formed by one frame structure. That is, it has a pair of left and right vertical frames 41, 41 and a pair of front and rear horizontal frames 42, 42, and the vertical frame 41 is bent into a predetermined angle valley shape at the boundary between the backrest portion 3 and the seat surface portion 2. It has a structure bent at a predetermined angle mountain shape at the boundary of the footrest portion 7.

  The support portion 5 also has a rectangular frame structure, and is set within a range of a projection region obtained by vertically projecting the chair body 4 with the backrest portion 3 almost raised. The reclining mechanism 6 includes link members 61 and 61 that connect the support portion 5 and the backrest portion 3, and movement provided in the vicinity of the side portions of the seat surface portion 2 of the chair body 4 and the bent portion of the backrest portion 3 that the vertical frame 41 constitutes. A pair of rollers 62 as a portion, a pair of U-shaped roller guides 63 as a guide portion on which the roller 62 is rotatably mounted and movable in the front-rear direction, and an actuator 64 that changes the posture of the chair body 4. It becomes the composition.

  A pair of left and right link members 61, 61 are provided, each having one end pivotally connected to the center of the left and right frame portions 41 a of the backrest 3 and the other end pivotally connected to the rear left and right corners of the support portion 5. In this example, the roller 62 is rotatably attached to the outer surface of the attachment plate 62a fixed to the lower end portions of the left and right frame portions 41a of the backrest portion 3. The left and right rollers 62 are connected to a connecting shaft 62b. The left and right rollers 62, 62 and the connecting shaft 62b constitute a moving part.

  The roller guide 63 is fixed in parallel to each other by a predetermined length on the left and right frames 51 and 51 of the support portion 5 with the U-shaped groove into which the roller 62 is fitted facing inward. The actuator 64 is configured to linearly expand and contract in the front-rear direction, the rear end is pivotally connected to the connecting shaft 62 b between the rollers 62, and the front end is pivotally connected to the front frame 52 of the support portion 5.

  The actuator 64 is not particularly limited as long as the actuator 64 can be driven to extend and contract. In this example, the cylinder 64b and the cylinder are configured to be extended and driven by a feed screw mechanism (not shown) and a motor 64a. A feed screw mechanism (not shown) is formed between the rod 64c inserted into the body 64b.

  Next, operation | movement of the chair of this Embodiment 1 is demonstrated. When the backrest 3 is tilted, the actuator 64 is contracted. Then, as shown in FIG. 2, the roller 62 rolls forward along the roller guide 63, the lower end of the backrest 3 moves forward, and the backrest 3 is pulled by the link member 61 and falls down by a predetermined angle. . In this way, the lower end moves forward while the backrest 3 falls down, so that the backrest 3 can be prevented from jumping out backward.

  On the other hand, since the angles of the seat surface part 2 and the footrest part 7 and the seat surface part 2 and the backrest part 3 of the chair body 4 are fixed, the footrest part 7 and the seat surface part 2 are lifted upward by the amount of the backrest part 3 falling down. Compared with the case where only the backrest 3 is tilted (see the two-dot chain line in the figure), the forward projecting dimension is shortened by the dimension b, and the occupied area can be reduced.

  In addition, since the shape of the chair body 4 does not change even when the backrest part 3 is tilted, the body contact position with respect to the backrest part 3 does not change, and in the case of a massage chair provided with a massage tool on the backrest part 3, Since the adjustment position of the tool does not change, there is no need to adjust the massage position again when the angle of the backrest 3 is changed. Further, since the angle between the seat surface portion 2 and the footrest portion 7 does not change, the height of the foot supported by the footrest portion increases at the same time when the backrest portion 3 falls down, which helps to eliminate the swelling of the foot.

  Next, another embodiment of the present invention will be described. In the following description, differences from the above embodiment will be mainly described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

Embodiment 2
FIG. 3 shows a chair according to Embodiment 2 of the present invention. In the second embodiment, the support portion 205 is provided with a front support leg 251 and a rear support leg 252 that are separated from each other in the front-rear direction. The front support leg 251 and the rear support leg 252 are U-shaped members and are integrally connected by a vertical frame 253 extending in the front-rear direction. The upper part of the front support leg 251 is connected by a front frame 254 extending in the lateral direction.

  The reclining mechanism 206 is assembled with a front roller 262 as a front moving portion provided on the front support leg 251 and a front roller 262 provided along the seat surface portion 2 so as to be rotatable and movable in the front-rear direction. A front roller guide 263 as a guide part, a rear roller 265 as a rear movement part provided on the rear support leg 252, and a rear roller 265 provided along the backrest part 3 are rotatable and movable in the front-rear direction. A rear roller guide 266 as a rear guide portion to be assembled, a telescopic actuator 64 that connects between the center frame 255 located at the boundary between the backrest portion 3 and the seat surface portion 2 of the chair body 4 and the front frame 254 of the support portion 205. The configuration of the chair body 4 is changed by the expansion and contraction of the actuator 64.

  The actuator 64 is disposed on the lower surface side of the seat surface portion 2, but is disposed on the backrest portion 3 side and connects the rear support leg 252 of the support portion 205 and the backrest portion 3 of the chair body 4. It is good. The actuator 64 may be configured to connect between the vertical frame 253 and the backrest 3 of the chair body 4.

  Also in the case of the second embodiment, when the backrest 3 is tilted, the actuator 64 is contracted as shown in FIGS. Then, the front roller 262 and the rear roller 265 roll and move rearward along the front roller guide 263 and the rear roller guide 266, the lower end of the backrest 3 relatively moves forward, and the front end of the seat 2 is Since it is lifted upward, the backrest 3 falls down by a predetermined angle. Thus, the backrest part 3 moves forward while falling down, so that the backrest part 3 can be prevented from jumping out backward.

On the other hand, since the seat surface part 2 and the footrest part 7 move while changing the angle obliquely upward, the forward projecting dimension is shorter than in the case of moving horizontally, and the occupied area can be reduced. Moreover, since the shape of the chair main body 4 does not change, the contact position of the body with respect to the backrest part 3 does not change. Furthermore, according to the structure of this Embodiment 2, since there is no link member which supports the backrest part 3 like Embodiment 1, the external shape close | similar to the chair where a movable part does not appear can be given. In the second embodiment, unlike the first embodiment, the configuration of the seat surface portion 2, the backrest portion 3 and the footrest portion 7 constituting the chair body 4 is not an integral configuration of the frame, but the seat surface portion 2 and the footrest portion 7. The frame body constituting the frame and the frame body constituting the backrest part 3 are integrally coupled, but the angles of the respective parts are the same.

Embodiment 3
FIG. 4 shows a chair according to Embodiment 3 of the present invention.
In the third embodiment, unlike the second embodiment, a pair of support walls 351 positioned on the left and right sides of the chair body 4 are provided on the pedestal-shaped support portion 305, and the chair body 3 is moved forward and backward with respect to the support wall 351. It comes to support in the place. In the illustrated example, a pair of fixed walls 21 protrudes from the seat surface portion 2 so as to face the support wall 351, and the fixed wall 21 is supported with respect to the support wall 351.

  The reclining mechanism 306 includes a front slide convex portion 362 and a rear slide convex portion 365 provided on the fixed wall 21 provided on the seat surface portion 2 of the chair body 4, and a front slide convex portion 362 and a rear portion provided on the support wall 351. The slide convex portion 365 is supported so as to be movable in the front-rear direction, and the backrest is guided so that the front slide convex portion 362 is positioned relatively above the rear slide convex portion 365 as the chair body 4 moves forward. A front guide groove 363 and a rear guide groove 366 as guides for tilting the posture of the portion 3 backward, and an extendable actuator 64 that connects the chair body 4 and the support portion 305 to change the posture of the chair body 4; Is provided.

  The front slide protrusion 362 and the rear slide protrusion 365 are slidably fitted into the front guide groove 363 and the rear guide groove 366. The rear guide groove 366 that guides the rear slide convex portion 365 has an inclination that becomes lower toward the front, and the front guide groove 363 that guides the front slide convex portion 362 becomes an inclination that becomes higher toward the front. Have

  One end of the actuator 64 is pivotally connected to a bracket 352 on the support portion located at the lower end of the rear portion of the support wall 351 of the support portion 305, and the other end is a front slide located at the lower front end of the fixed wall 21 of the chair body 4. It is pivotally connected to the center of the shaft 22 spanned between the convex portions 362. The actuator 64 is positioned substantially on the same inclination line as the front guide groove 363.

  Also in the case of the third embodiment, as shown in FIGS. 4B and 4C, the actuator 64 is extended when the backrest 3 is tilted. Then, the front slide convex portion 362 and the rear slide convex portion 365 are slid forward along the front guide groove 363 and the rear guide groove 366, the lower end of the backrest portion 3 moves forward, and the seat surface portion 2 front end Is lifted upward, and the backrest 3 falls down by a predetermined angle. Thus, the backrest part 3 moves forward while falling down, so that the backrest part 3 can be prevented from jumping out backward.

  On the other hand, since the seat surface part 2 and the footrest part 7 move while changing the angle obliquely upward, the forward projecting dimension is shorter than in the case of moving horizontally, and the occupied area can be reduced. Moreover, since the shape of the chair main body 4 does not change, the contact position of the body with respect to the backrest part 3 does not change.

  According to the configuration of the third embodiment, since the actuator 64 and the like are hidden by the support wall 351 and the fixed wall 21, it is easy to protect the movable part. However, instead of the fixed wall 21, a frame material that supports the chair body 4 from below and supports the front slide convex portion 362 and the rear slide convex portion 365 laterally may be used.

Embodiment 4
FIG. 5 shows a chair according to Embodiment 4 of the present invention. In the fourth embodiment, the reclining mechanism 406 includes a link member 61 that connects the frame-shaped support part 405 and the backrest part 3, and a moving part provided near the boundary between the seat surface part 2 and the backrest part 3 of the chair body 4. As a wheel 462 and a motor 464 as an actuator for changing the posture of the chair body 4. That is, a wheel 462 that is in rolling contact is used as the moving unit, and a motor 464 that rotationally drives the wheel 462 is used as an actuator.

  The support portion 405 is a rectangular frame as in the first embodiment, but the width of the left and right frames 451 is wide, and the wheels 462 are in contact with the upper surfaces of the left and right frames 451 so that they can roll. A rubber tire is used for the wheel 462, and the wheel 462 is rotatably attached to a mounting plate 462a fixed to the frame near the boundary between the seat surface part 2 and the backrest part 3 of the chair body 4, and is moved on the frame 451 by frictional force with the frame 451. Moving.

  The motor 464 has a motor shaft arranged along the frame 451 so as not to protrude to the side of the support portion 405. Since the drive shaft of the motor 464 is orthogonal to the axle of the wheel 462, the direction in which power is transmitted is changed by a power transmission mechanism including a worm and a worm wheel (not shown).

  In order to limit the angle of the backrest 3 to a predetermined range, limit switches 467 and 468 for detecting the minimum position (rise position) and the maximum position (position where the fallback is the largest) of the tilt angle of the backrest 3 are provided. It has been. In the illustrated example, the limit switches 467 and 468 are arranged on the frame 41 a of the backrest portion 3 with the connecting portion of the link member 61 interposed therebetween, and are turned on and off by the inclination of the link member 61.

  In the case of the fourth embodiment, when the backrest portion 3 is tilted, as shown in FIGS. 5B and 5C, the wheels 462 are rotationally driven by the motor 464, and the wheels 462 are moved to the left and right of the support portion 405. Roll forward along the frame 451. Thereby, while the lower end of the backrest part 3 moves forward, the front end of the seat surface part 2 is lifted upward. When tilted by a predetermined angle, the link member 61 pushes one limit switch 467 and stops. When getting up, the motor 464 is reversely rotated to move the wheel 462 at the lower end of the backrest 3 backward. When the predetermined angle is raised, the link member 61 is stopped by the other limit switch 468 being pushed.

  Thus, the backrest part 3 moves forward while falling down, so that the backrest part 3 can be prevented from jumping out backward. On the other hand, since the seat surface part 2 and the footrest part 7 move while changing the angle obliquely upward, the forward projecting dimension is shorter than in the case of moving horizontally, and the occupied area can be reduced. Moreover, since the shape of the chair main body 4 does not change, the contact position of the body with respect to the backrest part 3 does not change.

FIG. 6 shows a modification of the fourth embodiment. In this modification, in the reclining mechanism 406 of the fourth embodiment, a pinion 469a disposed near the boundary between the seat surface portion 2 and the backrest portion 3 and a rack 469b disposed on the support portion 405 and meshing with the pinion 469a are added. It is provided.

  The pinion 469a is disposed coaxially with the wheel 462 and is driven to rotate integrally with the wheel 462 by a motor 464. The pinion 469a and the wheel 462 may drive only the wheel 462 or only the pinion 469a. Further, the chair body 4 may be supported by the pinion 469a without providing the wheel 462.

Embodiment 5
FIG. 7 shows a chair according to the fifth embodiment. The fifth embodiment is different from the fourth embodiment in the configuration of the support portion and the actuator, but the other configurations are the same as those in the fourth embodiment. That is, the support portion 505 is not a frame structure but a block body including left and right guide walls 551 and a bottom wall 552 that connects the lower ends of the left and right guide walls 551, and the upper surface of the guide wall 551 is high. The reclining mechanism 506 includes a link member 61 that couples the support portion 505 and the backrest portion 3, and a seat surface portion 2 of the chair body 4 and a wheel 462 as a moving portion provided near the boundary of the backrest portion 3, and left and right guides A wheel 462 at the lower end of the backrest part 3 rolls on the upper surface of the wall 551.

  The actuator 64 is not a rotary type, and is configured to expand and contract similarly to the first embodiment, and the actuator 64 is interposed between the support portion 505 and the backrest portion 3. In the illustrated example, the upper end of the actuator 64 is connected to an intermediate frame 44 provided at an intermediate position in the height direction of the backrest 3. The intermediate frame 44 is spanned between the left and right frames 41, 41 of the backrest 3. The lower end of the actuator 64 is rotatably connected to the bottom wall 552 of the support portion 505.

  According to the chair according to the fifth embodiment, when the backrest portion is tilted, the actuator 64 is contracted as shown in FIGS. When the actuator 64 contracts, the wheel 462 rolls forward along the left and right guide walls 551, the lower end of the backrest 3 moves forward, and the backrest 3 is pulled by the link member 61 and falls down by a predetermined angle. Thus, the backrest part 3 moves forward while falling down, so that the backrest part 3 can be prevented from jumping out backward. On the other hand, since the angles of the seat surface portion 2 and the footrest portion 7 and the seat surface portion 3 and the backrest portion 3 of the chair body 4 are fixed, the seat surface portion 2 and the footrest portion 7 are lifted upward by the amount of the backrest portion 3 falling down. In addition, even if the backrest part 3 is tilted, the shape of the chair body 4 does not change, so that the position of the body contacting the backrest part 3 does not change.

Modified Example of Embodiment 5 FIG. 8 shows a modified example of the fifth embodiment. In this modification, the actuator 64 is interposed between the support portion 505 and the seat surface portion 2. In the illustrated example, the upper end of the actuator 64 is connected to an intermediate frame 45 provided at the front end portion of the seat surface portion 2. The lower end of the actuator 64 is rotatably connected to the bottom wall 552 of the support portion 505.

  When the backrest 3 is tilted, the actuator 64 is extended as shown in FIGS. When the actuator 64 is extended, the front end of the seat surface portion 2 is lifted, the lower end of the backrest portion 3 is moved forward, and the backrest portion 3 is pulled by the link member 61 and falls down by a predetermined angle.

Embodiment 6
FIG. 9 shows a chair according to the sixth embodiment. In the sixth embodiment, the chair body is the same as that of the first embodiment, but the configuration of the reclining mechanism is basically different. That is, the reclining mechanism 606 includes a four-joint link mechanism 661 that couples the seat surface portion 2 of the chair body 4 and the support portion 605 and an actuator 64 of an extendable configuration provided in a diagonal direction of the four-joint link mechanism 661. It has a configuration.

  The four-bar linkage mechanism 661 includes a pair of left and right front link members 662 and a pair of left and right rear link members 663, and the front link member 662 is positioned slightly forward from the center of the seat surface portion 2 of the chair body 4. The rear link member 663 is interposed between the vicinity of the boundary between the seat surface portion 2 and the backrest portion 3 and the intermediate position of the support portion 605.

  The upper ends of the front link member 662 and the rear link member 663 are rotatably connected to a fixing plate 662a fixed to the left and right frames 41b, 41b of the seat surface portion 3, and the lower ends of the front link member 662 and the rear link member 663 are It is rotatably connected to the support portion 605 via a bracket.

  The front link member 662 is longer than the rear link member 663, and at the position where the backrest portion 3 is raised, as shown in FIG. 9B, the front link member 662 and the rear link member 663 both have their upper ends behind the lower ends. In the tilted posture, the rear link member 663 has a smaller rearward tilt angle. When the front link member 662 and the rear link member 663 are rotated counterclockwise in the figure with the lower end as a fulcrum, the rotation angle of the rear link member 663 is larger, and the position where the backrest portion 3 is most tilted is The upper end of the link member 662 has not yet reached the highest position and is tilted backward, but the upper end of the rear link member 663 has passed the highest position and the upper end is inclined forward, and the backrest portion 3 is tilted backward. At the same time, the lower end of the backrest part 3 is moved forward, and the front end of the seat surface part 2 is lifted upward.

  The actuator 64 is a telescopic actuator similar to that of the first embodiment, and is disposed obliquely between the lower end position of the front link member 662 and the upper end position of the rear link member 663 in the side views of FIGS. The front end of the actuator 64 is rotatably connected to a bracket 651 fixed to the support portion 605, and the rear end of the actuator 64 is an intermediate frame 43 provided near the boundary between the seat surface portion 2 and the backrest portion 3 of the chair body 4. Is pivotably connected to the center of the frame.

  Next, the operation of the sixth embodiment will be described. FIG. 9B shows a posture in which the backrest part is raised. In this state, the actuator 64 is in the fully extended state, and when the backrest 3 is tilted, the actuator 64 is contracted. When the actuator 64 contracts, both the rear link member 663 and the front link member 662 rotate counterclockwise, and the displacement of the upper end of the front link member 662 is larger than the upper end of the rear link member 663. Since the forward displacement of the rear link member 663 is larger than the forward displacement of the front link member 662, the lower end moves forward while the backrest portion 3 falls backward, and the front end of the seat surface portion 2 moves upward. It can be lifted and the backrest 3 can be prevented from jumping out to the rear, and the occupied area can be reduced.

  The chair of the present invention is suitable for a massage chair provided with a massage tool in the backrest portion, but is not limited to a massage chair, and can be used for various chairs that perform a reclining operation. Moreover, in the said embodiment, although the chair of this invention was demonstrated taking the chair which has a footrest part as an example, this reclining system is applicable also to the chair which does not have a footrest.

FIG. 1 is a perspective view showing a skeletal structure of a chair according to Embodiment 1 of the present invention. 2A is a side view showing a state where the backrest portion of the chair of FIG. 1 is raised, and FIG. 2B is a side view showing a state where the backrest portion is tilted. FIG. 3 shows a chair according to Embodiment 2 of the present invention, where FIG. 3A is a perspective view showing a skeletal structure, FIG. 3B is a side view showing a state where a backrest portion is raised, and FIG. (C) is a side view which shows the state in which the backrest part fell down. FIG. 4 shows a chair according to Embodiment 3 of the present invention, where FIG. 4A is a perspective view showing a skeletal structure, FIG. 4B is a side view showing a state where a backrest part is raised, and FIG. (C) is a side view which shows the state in which the backrest part fell down. FIG. 5 shows a chair according to Embodiment 4 of the present invention, where FIG. 5A is a perspective view showing a skeletal structure, FIG. 5B is a side view showing a state where a backrest is raised, and FIG. (C) is a side view which shows the state in which the backrest part fell down. FIG. 6 shows a modification of the fourth embodiment. FIG. 6A is a perspective view showing a skeletal structure, FIG. 6B is a side view showing a state where a backrest is raised, and FIG. FIG. 5 is a side view showing a state in which a backrest portion has fallen. FIG. 7 shows a chair according to Embodiment 5 of the present invention. FIG. 7 (A) is a perspective view showing a skeletal structure, FIG. 7 (B) is a side view showing a state where a backrest part is raised, and FIG. (C) is a side view which shows the state in which the backrest part fell down. FIG. 8 shows a modification of the fifth embodiment of the present invention. FIG. 8A is a perspective view showing a skeletal structure, FIG. 8B is a side view showing a state where a backrest part is raised, and FIG. (C) is a side view which shows the state in which the backrest part fell down. FIG. 9 shows a chair according to Embodiment 6 of the present invention, where FIG. 9 (A) is a perspective view showing a skeletal structure, FIG. 9 (B) is a side view showing a state where a backrest part is raised, and FIG. (C) is a side view which shows the state in which the backrest part fell down.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair 2 Seat surface part 3 Backrest part 4 Chair main body 5 Support part 6 Reclining mechanism 7 Footrest part 41 Vertical frame, 42 Horizontal frame 42
44, 45 Intermediate frame 61 Link member 62 Roller 63 Roller guide 64 Actuator 41a Backrest frame 41a
62a mounting plate 62b connecting shaft 64a motor 64a, 64b cylinder 64c rod 205 support part 251 front support leg, 152 rear support leg 206 reclining mechanism 262 front roller, 163 roller guide 265 rear roller, 166 rear roller guide 305 support part 351 Support wall 306 Reclining mechanism 362 Front slide convex portion 365 Rear slide convex portion 363 Front guide hole 366 Rear guide hole 406 Reclining mechanism 405 Support portion 462 Wheel 464 Motor 451 Frame 467, 468 Limit switch 469a Pinion 469b Rack 505 Support portion 551 Guide wall 552 Bottom wall 606 Reclining mechanism 661 Four-bar linkage mechanism 662 Front link member 663 Rear link members 662a and 663a Fixing plate 605 Support portion 651 Bracket Door

Claims (15)

A chair body having a seat surface part and a backrest part, and a support part for supporting the chair body from below,
A chair provided with a reclining mechanism for moving the seat surface portion and the backrest portion forward together with a backward tilting operation of the backrest portion in a state where the angle between the seat surface portion and the backrest portion is fixed. The reclining mechanism is assembled with a link member for connecting the support portion and the backrest portion, a moving portion provided in the vicinity of a bent portion of the seat surface portion and the backrest portion of the chair body, and the moving portion being movable in the front-rear direction. The chair according to claim 1, wherein the chair includes a guide portion and an actuator that changes a posture of the chair main body. The chair according to claim 2, wherein the actuator is configured to expand and contract, and has one end connected to the moving part of the chair body and the other end connected to the support part. The chair according to claim 2, wherein the actuator is configured to expand and contract, and is configured to connect the support portion and the seat surface portion. The chair according to claim 2, wherein the actuator is configured to expand and contract, and is configured to connect the support portion and the backrest portion. A front support leg and a rear support leg are provided apart from the front and rear of the support part, and a reclining mechanism is provided along a front moving part provided on the front support leg, and the front part provided along the seat surface part. A front guide portion that is movably assembled in the front-rear direction, a rear movement portion that is provided on the rear support leg, and a rear movement portion that is provided along the backrest portion and that is movably assembled in the front-rear direction. And a chair that is configured to change a posture of the chair body by expansion and contraction of the actuator. 1. The chair according to 1. The chair according to claim 6, wherein the actuator is configured to connect a front support leg of the support portion and a seat surface portion of the chair body. The support part is provided with support walls located on the left and right sides of the chair body, and the reclining mechanism is provided with a front moving part and a rear moving part provided on one of the support wall and the chair body, and the front moving part provided on the other side. A guide that supports the rear moving part movably in the front-rear direction and guides the front moving part relatively upward rather than the rear moving part as the chair body moves forward, and tilts the posture of the backrest part backward, The chair according to claim 1, further comprising an extendable actuator that connects the chair body and the support portion to change a posture of the chair body. 9. The chair according to claim 8, wherein the guide is a guide groove provided in a support wall, and the front moving portion and the rear moving portion are guide convex portions that slidably fit into the guide groove. . 10. The guide according to claim 8, wherein the guide for guiding the rear moving portion has a slope that decreases toward the front, and the guide for guiding the front moving portion has a slope that increases toward the front. Chair. The reclining mechanism includes a four-bar linkage mechanism that connects a seat surface portion and a support portion of the chair body, and a telescopic actuator provided in a diagonal direction of the four-bar link mechanism. The listed chair. The reclining mechanism includes a link member that connects the support portion and the backrest portion, a moving portion provided in the vicinity of a bent portion of the seat surface portion and the backrest portion of the chair body, and an actuator that changes the posture of the chair body. The chair according to claim 1, wherein the chair is configured as described above. The chair according to claim 12, wherein the moving unit is provided with a wheel that makes rolling contact, and the actuator is a rotary actuator that rotationally drives the wheel. The chair according to claim 12, wherein the reclining mechanism includes a pinion disposed near a boundary between the seat surface portion and the backrest portion, and a rack disposed on a support portion and meshing with the pinion. The chair according to any one of claims 1 to 14, wherein the chair is used as a massage chair provided with a massage tool in a backrest portion.

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