JP6448390B2 - Chair - Google Patents

Description

  The present invention relates to a chair in which the tilt of the backrest and the displacement of the seat are interlocked.

  Conventional chairs with a reclining mechanism include those in which only the backrest tilts, and those in which the seat tilts in conjunction with the movement of the backrest (for example, see Patent Document 1).

  Japanese Patent No. 4796087

  In the conventional chair with a reclining mechanism, since the inclination angle of the seat is insufficient with respect to the reclining of the backrest, it is difficult for the seated person to maintain a natural posture when reclining.

  Moreover, in the chair disclosed in Patent Document 1, the sitting comfort is improved by providing a mechanism such as moving the seat backward with the inclination of the backrest, but the structure of the chair becomes complicated.

  An object of the present invention is to provide a chair that can recline in a state where a seated person maintains a natural body while having a simple structure.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1]
A backrest that can be tilted with a center of rotation supported integrally with the seat;
A first guide portion that regulates a movement path of the first portion of the seat;
A second guide portion for restricting the movement path of the second location on the rear end side from the first location of the seat;
A third guide part for restricting the movement path of the lower end part of the backrest;
Have
The first and second guide portions include the first portion and the second guide portion so that the seat moves backward from the first posture and the rear end side is greatly lowered from the front end side and is displaced to the inclined second posture. Guide two places,
The third guide portion regulates an inclination angle of the backrest at each position of the seat.

  In the above invention, the seat can be displaced along a desired movement path by being guided by the first and second guide portions, and the inclination angle of the backrest at each position of the seat is regulated by the third guide portion. Thereby, it is possible to provide a good sitting comfort in any position.

[2] A push-up mechanism for pushing up the rear end side of the seat is provided,
The push-up mechanism includes a first link whose one end is pivotally supported at a predetermined position on the rear end side of the seat, and one end which is pivotally connected to the other end of the first link. The second link whose end is below the predetermined location and is pivotally supported by the base portion of the chair, and the connection location between the first link and the second link, and the first link The chair according to [1], further comprising: an urging portion that urges the second link in a direction approaching 180 degrees.

  In the above invention, the horizontal movement given to the connecting portion of the first link and the second link by the urging portion is converted into the vertical movement by the first and second links, and the rear end side of the seat portion is moved upward. Energize to.

[3] The first link and the second link are provided so as to protrude rearward,
The urging portion is a damper having a cylinder, a piston that moves in the cylinder, and a piston rod that extends from the piston and is urged in a direction to enter the cylinder, one end of which is the connection portion The chair according to [2], wherein the other end is supported by the base portion below the front end side of the seat.

  In the said invention, a damper is provided so that it may expand-contract in the front-back direction of a seat, and when a piston rod advances from a cylinder, a 1st link and a 2nd link become convex backward. As a result, the minimum length allowed for the damper can be made longer.

[4] Each of the first and second guide portions is a guide groove corresponding to the moving path, and a slide piece that is elongated along the guide groove and moves in the guide groove while being fitted in the guide groove. The chair according to any one of [1] to [3], wherein the guide groove is provided on one of the seat and the base, and the slide piece is provided on the other.

  In the said invention, arbitrary movement paths can be formed easily. Further, since the elongate slide piece moves along the guide groove in the guide groove, it can be slid and moved at an intermediate position of the slide with less play.

[5] The guide groove of the first guide portion and the guide groove of the second guide portion each have a concentric arc centered on a predetermined position in front of and below the seat. [4] ] The chair as described in.

  In the above invention, the seat is displaced with the predetermined position below the front of the seat as the virtual rotation center.

[6] The chair according to any one of [1] to [5], including an armrest provided integrally with the seat.

  In the above invention, since the seat and the armrest are displaced together, the armrest becomes a convenient position for the seated person at any position.

  According to the chair of the present invention, the seated person can recline while maintaining a natural body while having a simple structure, and a good sitting comfort can be obtained.

It is a front view showing an outline structure of a chair concerning an embodiment of the invention. It is a schematic structure of the chair which concerns on embodiment of this invention, Comprising: It is a side view which shows the state of an upright attitude | position (position 1). It is a schematic structure of the chair concerning an embodiment of the invention, and is a side view showing the state of an intermediate posture (position 3). It is a schematic structure of the chair which concerns on embodiment of this invention, Comprising: It is a side view which shows the state of a reclining attitude | position (position 5). It is a figure (position 1) which shows the structure of a guide part. It is a figure (position 3) which shows the structure of a guide part. It is a figure which shows schematic structure of a pushing-up mechanism.

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

  FIG. 1 is a front view showing a schematic structure of a chair 5 according to an embodiment of the present invention, and FIG. 2 is a side view showing a schematic structure of the chair 5.

  When the chair 5 is displaced from the upright posture in which the backrest 20 is erected to the reclining posture in which the backrest 20 is tilted, the chair 5 is displaced so that the rear end side is lowered more than the front end side while the seat 10 is lowered rearward. The inclination angle of the backrest 20 changes in conjunction with the displacement of the seat 10. In the chair 5, the inclination angle of the backrest 20 at each position of the seat 10 cannot be freely changed by a seated person, and the inclination angle of the backrest 20 at each position of the seat 10 is uniquely defined.

  Here, at each position of the seat 10, the backrest 20 is set so as to be interlocked with an ideal inclination angle that is considered to be comfortable to sit. That is, on the basis of each type of chair prototype, each type is connected to perform a reclining operation smoothly. Therefore, in any position, an optimal posture is provided and a good sitting comfort is provided.

  Specifically, in the position 1 (upright posture) shown in FIG. 2, the seat 10 is 0 degrees with respect to the horizontal, and the backrest 20 is 93 degrees with respect to the horizontal and is almost upright. In the position 3 (intermediate posture) shown in FIG. 3, the seat 10 is tilted backward by 6 degrees, and the backrest 20 is 105 degrees with respect to the horizontal. In the position 5 (reclining posture) shown in FIG. 4, the seat 10 is inclined backward by 12 degrees, and the backrest 20 is 115 degrees relative to the horizontal. Although not shown, in the position 2 between the position 1 and the position 3, the seat 10 is inclined backward by 3 degrees, and the backrest 20 is 100 degrees with respect to the horizontal. Further, at the position 4 (not shown) between the position 3 and the position 5, the seat 10 is inclined backward by 9 degrees, and the backrest 20 is 110 degrees with respect to the horizontal.

  The chair 5 includes a seat 10 on which a seated person's buttocks can be placed, a backrest 20 that can be tilted with the center of rotation supported integrally with the seat 10, a pair of left and right armrests 15 provided integrally with the seat 10, and a floor surface. The base portion 60 is installed on the base plate.

  Moreover, the chair 5 has the 1st guide part 30 and the 2nd guide part 40 for attaching the seat 10 to the base part 60 so that a displacement is possible. The first guide portion 30 regulates the movement path of the first location (portion near the front end) of the seat 10. The second guide portion 40 regulates the movement path of the second location on the rear end side from the first location of the seat 10 (the portion slightly on the rear end side from the center). Further, the chair 5 has a third guide portion 50 that regulates the movement path of the lower end portion of the backrest 20 whose rotation center is supported integrally with the seat 10.

  When the first guide portion 30 and the second guide portion 40 are displaced from the upright posture to the reclining posture, the first portion and the second portion of the seat 10 are arranged such that the seat 10 moves backward and the rear end is lowered more than the front end. Regulate the movement path of the location. The third guide part 50 functions to regulate the inclination angle of the backrest 20 at each position of the seat 10.

  The configuration of the chair 5 will be described in more detail.

  The seat 10 is configured by covering the seat frame 11 with a cushioning material, a covering material, or the like. The seat frame 11 arranges substantially rectangular support plates 11a standing along the front-rear direction of the chair 5 on the left and right sides with an interval corresponding to the width of the seat 10, and the front ends of the lower portions of these support plates 11a. And the rear ends are connected by connecting rods 11b. The upper part of the support plate 11a of the seat frame 11 is bent outward, and an armrest 15 formed by covering the cushioning material with a covering material is attached to that portion.

  The backrest 20 is configured by covering a back frame 21 formed of a rectangular frame and a horizontal rail connecting the same with a cushion material, a covering material, or the like.

  The base part 60 includes a pair of left and right side plates 61 arranged in a direction along the front-rear direction of the chair 5 while standing on the floor surface. The left and right side plates 61 are columnar connecting rods 62 (a front end lower connecting rod 62a, a center lower connecting rod 62b, and a rear end lower connecting rod 62c) at the lower front end, the lower central portion, and the lower rear end of the chair 5, respectively. It is connected with.

  5 and 6 are views for explaining the structure of the first guide portion 30, the second guide portion 40, and the third guide portion 50, and a push-up mechanism 70 and the like to be described later are not shown.

  As shown in FIGS. 5 and 6, the first guide portion 30 is elongated along the guide groove 31 corresponding to the movement path of the first location of the seat 10 and is fitted in the guide groove 31. The slide piece 32 moves in the guide groove 31. The guide groove 31 is provided by being drilled at a position near the upper front end of the side plate 61 of the base portion 60. The slide piece 32 is provided to protrude outward at a location (first location) near the lower front end of the support plate 11 a of the seat frame 11.

  Similarly, the second guide portion 40 has a guide groove 41 corresponding to the movement path of the second location of the seat 10 and is elongated along the guide groove 41 and fits into the guide groove 41 so as to pass through the guide groove 41. And a moving slide piece 42. The guide groove 41 is provided by drilling at a position near the upper center of the side plate 61 of the base portion 60. The slide piece 42 is provided so as to protrude outward at a position (second position) slightly closer to the rear end than the center of the lower portion of the support plate 11 a of the seat frame 11.

  The seat 10 is formed by fitting slide pieces 32 and 42 that protrude outwardly on the left and right of the lower portion of the seat frame 11 into guide grooves 31 and 41 provided on the side plate 61 of the base portion 60. The part 60 is supported so as to be displaceable.

  The guide groove 31 of the first guide portion 30 is a part of a circle centering on a predetermined position in front and below the seat 10 (virtual rotation center A corresponding to the position of the ankle of the seated person sitting on the chair 5). It has an arc shape. Similarly, the guide groove 41 of the second guide portion 40 also forms a partial arc shape of a circle centered on the virtual rotation center A. That is, each of the guide groove 31 of the first guide part 30 and the guide groove 41 of the second guide part 40 forms a concentric arc centered on the virtual rotation center A. The central angle of the arc of the guide groove 31 is equal to the central angle of the arc of the guide groove 41.

  The slide piece 32 and the slide piece 42 have an arc shape corresponding to the guide grooves 31 and 41 of mating counterparts.

  As the slide pieces 32 and 42 move along the guide grooves 31 and 41 in the guide grooves 31 and 41, the seat 10 is displaced as described above. That is, when changing from the upright posture to the reclining posture, the seat 10 is displaced so that the rear end side descends more greatly than the front end side while descending backward.

  The backrest 20 is provided with a substantially triangular flat-plate-shaped support arm 22 with its tip directed forward so as to protrude forward from the left and right sides of the back frame 21, and the tip of the support arm 22 serves as a rotation center B. The frame 11 is rotatably supported by a support plate 11a.

  The back frame 21 of the backrest 20 extends further below the support arm 22. The third guide portion 50 that restricts the movement path of the lower end portion of the backrest 20 when reclining is provided in the guide groove 51 drilled in the rear end portion of the side plate 61 of the base portion 60 and the lower end portion of the back frame 21. And a guide pin 52 fitted in the guide groove 51.

  The guide groove 51 is curved so that the backrest 20 has a desired inclination angle at each position of the seat 10 between the position 1 and the position 5 shown in FIGS.

  2 to 4, when the seat 10 is displaced between the position 1 and the position 5, the rotation center B of the backrest 20 is displaced together with the seat 10, and the guide pin 52 at the lower end of the backrest 20 is guided by the guide groove 51. Move. In other words, the third guide portion 50 regulates the relative position of the lower end portion (guide pin 52) of the backrest 20 with respect to the rotation center B of the backrest 20 at each position of the seat 10, so that the backrest 20 at each position of the seat 10. The inclination angle is regulated.

  The chair 5 includes a push-up mechanism 70 that pushes up the rear end side of the seat 10 to assist the seated person when returning from the reclining posture to the upright posture. FIG. 7 is a diagram showing the push-up mechanism 70 by a solid line and other parts by a broken line.

  The push-up mechanism 70 has a first link 71 pivotally supported at a predetermined position C on the rear end side of the seat frame 11 of the seat 10 and one end pivotable at the other end of the first link 71. The second link 72 that is connected and the other end is below the predetermined location C and is pivotally supported by the base portion 60 of the chair 5, and the connection location J of the first link 71 and the second link 72, A damper 74 is provided as an urging portion that urges the first link 71 and the second link 72 (an angle at the connection point J) to approach 180 degrees.

  The first link 71 and the second link 72 are shaped like a “<” that protrudes backward at the position 5 (see FIG. 4) where the rear end side of the seat 10 is lowered and the angle of the connecting portion J approaches 0 degrees. As the seat 10 approaches the position 1 (see FIG. 2) at which the seat 10 becomes substantially horizontal, the angle of the connecting portion J approaches 180 degrees. In this example, the angle of the first link 71 and the second link 72 at the connection point J is approximately 152 degrees at the position 1 and approximately 65 degrees at the position 5.

  The damper 74 includes a cylinder 74a, a piston that slides in the cylinder 74a, and a piston rod 74b that extends from the piston and enters and exits the cylinder 74a. By the air supplied from a compressor (not shown), the piston 74 The rod 74b is biased in the direction entering the cylinder 74a. The damper 74 may be a gas spring or the like.

  As shown in FIG. 7, the tip end of the piston rod 74b of the damper 74 is pivotally supported by the connecting portion J of the first link 71 and the second link 72, and the rear end of the cylinder 74a (the end opposite to the entrance / exit of the piston rod 74b) Is supported on the upper part of the holding plate 66 extending upward from the connecting rod 62a at the lower front end of the base part 60. In this state, the rear end of the cylinder 74a is below the front end of the seat 10 and is approximately half the height from the lower end of the base portion 60 to the seat 10.

  The damper 74 is arranged so that the longitudinal direction thereof is the front-rear direction of the seat 10, and when the seat 10 is at the position 1, the connecting portion J side is slightly above the horizontal, and when the seat 10 is at the position 5, the connecting portion is It is provided so that the J side faces slightly below the horizontal.

  The damper 74 gives a horizontal movement (front-rear movement) to the connection point J, and the first link 71 and the second link 72 change the horizontal movement at the connection point J to a predetermined position at the rear end of the seat frame 11. Convert to vertical movement to push C up.

  Furthermore, the chair 5 includes a lock mechanism 80 that locks the seat 10 so that the seat 10 is not displaced. The lock mechanism 80 includes a cylinder 80a, a piston that moves within the cylinder 80a, and a piston rod 80b that extends from the piston and moves forward and backward from the cylinder 80a and into the state housed in the cylinder. Thus, the piston rod 80b can be locked at an arbitrary advanced position. The rear end of the cylinder 80 a is pivotally supported by a connecting rod 62 a at the lower front end of the base portion 60, and the tip of the piston rod 80 b is pivotally supported at a predetermined location C on the rear end side of the seat frame 11 together with the upper end of the first link 71. Yes.

  The armrest 15 is provided with an operation button (not shown) for operating whether the lock mechanism 80 is locked or unlocked.

  Next, the movement of the chair 5 configured as described above will be described.

  The seated person can fix the seat 10 and the backrest 20 at an arbitrary position by setting the lock mechanism 80 to the locked state.

  When the lock of the lock mechanism 80 is released, the seat 10 and the backrest 20 can be displaced between the upright posture (position 1) and the reclining posture (position 5). At this time, the slide pieces 32 and 42 provided on the seat frame 11 slide in the guide grooves 31 and 41 drilled in the side plate 61 of the base portion 60.

  The seat 10 is displaced so as to rotate around the virtual rotation center A by being guided by the first guide portion 30 and the second guide portion 40 and moving. As a result, when reclining, the seat 10 is displaced in such a manner that the rear end side descends more than the front end while lowering backward. Further, the lower end of the backrest 20 is tilted to an ideal angle at each position of the seat 10 by the lower end of the backrest 20 being guided by the third guide portion 50. This provides the seated person with a good sitting comfort in any position.

  The seat 10 is not supported by a conventional structure in which a predetermined portion of the seat 10 is pivotally supported by the base portion 60 and the seat 10 is displaced about the pivotally supported portion. 10 is displaceably supported, so that the center of rotation of the seat 10 can be set at an arbitrary position away from the chair 5 (virtual rotation center A in the embodiment) and provides a good sitting comfort with little misalignment. can do.

  Further, when returning from the reclining posture to the upright posture, the push-up mechanism 70 pushes the rear end of the seat 10 upward, so that the seated person can easily return the seat 10 tilted backward to a horizontal posture. In addition, the seated person can easily tilt the backrest 20 against the action of the damper 74 by putting the weight on the backrest 20 in the unlocked state.

  Moreover, since the armrest 15 is displaced integrally with the seat 10, the armrest 15 is easy to use in any position.

  The push-up mechanism 70 converts the movement of the damper 74 extending and contracting in the front-rear direction of the seat 10 into the vertical movement for pushing up the predetermined portion C of the seat 10 by the first link 71 and the second link 72. That is, when the seat 10 is returned from the reclining posture tilted backward to the horizontal upright posture, the damper 74 applies a force to pull the connecting portion J of the first link 71 and the second link 72 substantially horizontally forward. . When this force is received, the first link 71 and the second link 72 change from the posture folded in the shape of “<” to the straight extended posture, and the lower end of the second link 72 is pivoted to the base portion 60. Since it is supported, the upper end of the first link 71 relatively moves upward, and the predetermined portion C at the rear end of the seat frame 11 is pushed upward.

  By employing the push-up mechanism 70 having such a configuration, the push-up mechanism 70 can be stored in a narrow space below the seat 10.

  That is, in the structure in which the rear end side of the seat 10 is directly pushed up by a gas spring or the like, the gas spring is located below the rear end of the seat 10 at a position where the rear end side of the seat 10 is lowered most (for example, position 5). It is necessary to secure a height that is equal to or greater than the length when shrunk. Therefore, the rear end of the seat 10 cannot be lowered greatly, and it becomes difficult to make the seat 10 an ideal inclination angle.

  In the push-up mechanism 70 of the present embodiment, the damper 74 can be disposed so that the expansion and contraction direction is the front-rear direction of the seat 10 and the rear end side of the seat 10 can be pushed up. It is possible to obtain an ideal inclination angle that is greatly inclined backward.

  Further, since the first guide portion 30 and the second guide portion 40 are structured so that the slide pieces 32 and 42 fitted in the guide grooves 31 and 41 move in the guide grooves 31 and 41, the slide pieces Compared to the case where one guide pin is used instead of 32 and 42, the contact area with the guide grooves 31 and 41 is increased, and the seat 10 can be stably supported at any position. In particular, even when the slide pieces 32 and 42 are at intermediate positions (positions other than both ends) of the guide grooves 31 and 41 as in the position 3, the seat 10 can be supported without rattling.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  The structure of the base portion 60 and the like shown in the embodiment is an example, and the present invention is not limited to this. Further, a caster or a turntable may be further provided below the base portion 60.

  In the embodiment, the guide grooves 31 and 41 are provided on the side plate 61 of the base portion 60 and the slide pieces 32 and 42 are provided on the seat frame 11, but the guide grooves are slid toward the base frame 60 side. It may be configured to provide a piece.

  In the embodiment, the damper 74 and the lock mechanism 80 are provided separately, but they may be configured as one. For example, a gas spring with a lock mechanism may be employed.

  The relationship between the displacement of the seat 10 and the inclination angle of the backrest 20 shown in FIGS. 2 to 4 is an example, and is not limited to this.

  In addition, it is desirable that the slide pieces 32 and 42 be as long as possible along the guide grooves 31 and 41 while ensuring a necessary movable range. The longer it is, the more the contact area with the guide grooves 31, 41 is increased and the more stable.

DESCRIPTION OF SYMBOLS 5 ... Chair 10 ... Seat 11 ... Seat frame 11a ... Support plate 11b ... Connecting rod 15 ... Armrest 20 ... Backrest 21 ... Back frame 22 ... Support arm 30 ... 1st guide part 31 ... Guide groove 32 ... Slide piece 40 ... 2nd Guide portion 41 ... Guide groove 42 ... Slide piece 50 ... Third guide portion 51 ... Guide groove 52 ... Guide pin 60 ... Base portion 61 ... Side plate 62 ... Connecting rod 62a ... Lower front end connecting rod 62b ... Lower center connecting rod 62c ... Connecting rod 66 at the lower end of the rear end 66 ... Holding plate 70 ... Push-up mechanism 71 ... First link 72 ... Second link 74 ... Damper 74a ... Cylinder 74b ... Piston rod 80 ... Lock mechanism 80a ... Cylinder 80b ... Piston rod A ... Virtual rotation Center B ... Center of rotation of backrest C ... Predetermined location J ... Connection location

Claims (6)

Zodiac,
A backrest that can be tilted with a center of rotation supported integrally with the seat;
A first guide portion that regulates a movement path of the first portion of the seat;
A second guide portion for restricting the movement path of the second location on the rear end side from the first location of the seat;
A third guide part for restricting the movement path of the lower end part of the backrest;
Have
The first and second guide portions include the first portion and the second guide portion so that the seat moves backward from the first posture and the rear end side is greatly lowered from the front end side and is displaced to the inclined second posture. Guide two places,
The third guide portion regulates an inclination angle of the backrest at each position of the seat. A push-up mechanism for pushing up the rear end side of the seat;
The push-up mechanism includes a first link whose one end is pivotally supported at a predetermined position on the rear end side of the seat, and one end which is pivotally connected to the other end of the first link. The second link whose end is below the predetermined location and is pivotally supported by the base portion of the chair, and the connection location between the first link and the second link, and the first link The chair according to claim 1, further comprising: an urging portion that urges the second link in a direction approaching 180 degrees. The first link and the second link are provided so as to protrude rearward,
The urging portion is a damper having a cylinder, a piston that moves in the cylinder, and a piston rod that extends from the piston and is urged in a direction to enter the cylinder, one end of which is the connection portion The chair according to claim 2, wherein the other end is supported by the base portion below the front end side of the seat. Each of the first and second guide portions includes a guide groove corresponding to the moving path, and a slide piece that is elongated along the guide groove and moves in the guide groove by fitting into the guide groove. The chair according to any one of claims 1 to 3, wherein the guide groove is provided in one of the seat and the base portion, and the slide piece is provided in the other. The guide groove of the first guide part and the guide groove of the second guide part each form a concentric arc centered on a predetermined position in front of and below the seat. Chairs. The chair according to any one of claims 1 to 5, further comprising an armrest provided integrally with the seat.