JP2016013305A - Seat member and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat member and a chair which can produce excellent sitting comfort.SOLUTION: A seat member 20 includes: a seat surface member 23 elastically deformed in the way that it warps downward by receiving weight of a sitter; and a downward displacement regulation part 24 which is arranged downward away from the seat surface member 23 and regulates downward displacement of the seat surface member 23 by the seat surface member 23 being elastically deformed and abutted. The seat surface member 23 has: a weight support region Sr which can be elastically deformed by the weight of a sitter; and a front region Sf which is arranged on a front side in the weight support region Sr and is relatively harder to elastically deform than the weight support region Sr. The downward displacement regulation part 24 is arranged nearer ahead of the weight support region Sr in a planar view of the seat member 20.

Description

  The present invention relates to a seat member and a chair.

  In general, a chair includes a leg, a seat supported by the leg, and a back provided behind the seat. As a seat portion of such a chair, a frame frame formed in a four-sided frame shape, a seat plate whose edge is supported by the frame frame and molded from a hard synthetic resin, and a soft elastic body placed on the seat plate The thing provided with the formed cushion material and the skin material which covers these seat boards and cushion materials is proposed (refer the following patent documents 1).

  In such a chair, when the user sits on the seat, the seat plate and the cushion material are elastically deformed and displaced so as to sink into the inner peripheral side of the frame frame. Thereby, a seating person can be given a flexible and comfortable seating feeling. On the other hand, in the central part of the seat part where the load acts most when seated, there is no support member such as a frame frame that supports the seat part below, so the seat plate and the cushioning material sink. It is difficult to limit.

  In view of this, a chair has been proposed that includes an intermediate member that is disposed so as to extend in the left-right direction below a central portion in plan view of the seat (seat) (see Patent Document 2 below).

Japanese Patent No. 4518603 JP 2009-106422 A

  In the chair described in Patent Document 2, the intermediate member is disposed below and spaced from the cushion material and the inner shell constituting the seat portion. When the user sits on the seat portion, the cushion member and The inner shell is displaced downward so as to sink. For example, when the inner shell comes into contact with the intermediate member due to a load acting on the seat from the user, the downward displacement may be limited. However, the inner shell is provided below the central portion in plan view, that is, below the seated person. When the inner shell and the intermediate member come into contact with each other due to the load acting on the seat from the seated person, the seated person There is a problem that the user feels the abutment feeling and the sitting comfort is poor.

  Then, this invention is made | formed in view of the said situation, and is providing the seat member and chair which can be set as favorable seating comfort.

In order to achieve the above object, the present invention employs the following means.
In other words, the seat member according to the present invention is a seat member of a chair that supports a seated person, and receives a load of the seated person, and is elastically deformed so as to bend downward, and the seat surface member. A downward displacement restricting portion that is arranged to be spaced apart downward and restricts the downward displacement of the seat surface member by the elastic deformation and contact of the seat surface member. A load supporting region that is elastically deformable by a load of a seated person, and a front region that is disposed on the front side of the load supporting region and is less likely to be elastically deformed relative to the load supporting region. The portion is arranged in front of the load support region in plan view of the seat member.

In the seat member configured as described above, the load supporting region that supports the seated person's buttocks is greatly elastically deformed and bent, and is greatly displaced downward. Thereby, the part arrange | positioned ahead of the load support area | region in a seat surface member contact | abuts the downward displacement control part arrange | positioned in the front side of a load support area | region. In other words, the portion of the seat member that contacts the downward displacement restricting portion is disposed on the front side of the load support region that supports the seated person's buttocks. Therefore, since the feeling of contact between the downward displacement restricting portion and the seat member is difficult to be transmitted to the load supporting region that supports the seated person's buttocks, a good sitting comfort can be achieved.
Further, in a state where the downward displacement restricting portion and the seat member are in contact with each other and the downward displacement of the seat member is restricted, the load supporting region supports the seated person's buttocks and the seat member flexes downward. Then, it deforms so as to wrap the buttocks of the seated person from below. On the other hand, in the front region, the thigh of the seated person is supported, and the front part of the seat member is deformed so as to be inclined downward. Therefore, the seat member can be deformed along the body part of the seated person, so that the sitting comfort can be improved.

  Further, the seat member according to the present invention is disposed at a boundary portion between the load support region and the front region of the seat member, and restricts rearward displacement of the seat member due to the load of the seated person. It is preferable to further include a displacement regulating means.

In the seat member configured as described above, when a backward force is applied to the seat member, the seat member tends to be displaced rearward, but the rear displacement restricting means causes the seat member to be displaced rearward. Is regulated. Thereby, in a load support area, a seated person's buttocks are supported, and a seat surface member bends below and changes so that a seated person's buttocks may be wrapped from below. On the other hand, in the front region, in a state in which rearward displacement is restricted, the front portion is deformed so as to be inclined downward, and the thigh of the seated person is not easily displaced in the front-rear position. Can be supported.
Further, the position of the rear displacement regulating means can be a clear fulcrum when the front part of the front region is deformed so as to incline downward. Therefore, only in a limited range of the front region, the front part can be displaced so as to incline downward in accordance with the thigh of the seated person, and the seat member can be more along the body part of the seated person. Can be deformed.
As described above, the load support region and the front region can be independently deformed and displaced in accordance with the acting force.

  Further, in the seat member according to the present invention, the rear displacement restricting means is engaged with the rear displacement restricting portion extending downward from the lower surface of the seat surface member and the rear displacement restricting portion, so that the rear of the seat surface member is engaged. It is possible to have an engaged portion for restricting displacement to the lower displacement regulating portion, and the downward displacement restricting portion may also serve as the engaged portion.

  In the seat member configured as described above, the rearward displacement of the seating surface member is restricted by the engagement between the rearward displacement restricting portion and the downward displacement restricting portion. Accordingly, in a state where the downward displacement of the seat member is restricted, that is, in a state where the load support area of the seat member is displaced downward and the position of the seat buttock is stable, The position of the part can also be stabilized. Further, depending on the direction and magnitude of the load applied to the seat portion, the seat surface member is not displaced vertically downward, but is displaced so that the rear portion is inclined downward, and the lower displacement restricting portion is moved from the lower surface of the seat surface member. Even in the case of first contacting the rear displacement restricting portion, the direction of displacement can be pulled back vertically downward.

  Moreover, the seat member which concerns on this invention WHEREIN: The said back displacement control part may be extended in the left-right direction of the said seat surface member.

  In the seat member configured as described above, the rearward displacement of the seat member is restricted over the left and right direction of the seat member. Therefore, the load support area and the front area can be clearly distinguished over the left-right direction. Therefore, the front part can be displaced so as to incline downward in accordance with the thigh of the seated person only within a limited range of the front region.

  Moreover, the seat member which concerns on this invention may be provided with the rib extended in the front-back direction at the front side of the said back displacement control part in the said seat surface member.

  In the seat member configured as described above, a rib extending in the front-rear direction is provided on the front side of the rear displacement restricting portion of the seat surface member, so that rigidity is increased in the front region of the seat surface member, and the load of the seated person is increased. The deformation due to is suppressed. Accordingly, the front region of the seat member can be deformed along the thigh of the seated person without being affected by the displacement of the load support region.

  In the seat member according to the present invention, the seat member has a front displacement restricting portion that is positioned with respect to the lower displacement restricting portion on a side opposite to the rear displacement restricting portion across the lower displacement restricting portion. You may do it.

In the seat member configured as described above, when the load acting on the seat member is removed, the seat surface member is displaced so as to separate the rear displacement restricting portion from the lower displacement restricting portion, and before the load acts. Try to return to the initial position. At this time, since the lower displacement restricting portion is disposed between the rear displacement restricting portion and the front displacement restricting portion, the lower displacement restricting portion is positioned with respect to the seat member. Therefore, since the amount of displacement of the seat member when the seat member attempts to return to the initial position is suppressed, deterioration of the seat portion can be suppressed.
In addition, when a load is applied to the seat member, the seat member is not displaced vertically downward, but is displaced so that the front portion is inclined downward depending on the direction and magnitude of the load applied to the seat member. Thus, even when the lower displacement restricting portion comes into contact with the front displacement restricting portion before the lower surface of the seat member, the direction of displacement can be pulled back vertically downward. As a result, the load supporting region is deformed so as to support the seated person's buttocks while the forward displacement is restricted, and the seat surface member bends downward to wrap the seated person's buttocks from below. On the other hand, in the front region of the seat member, the front part is deformed so as to be inclined downward, and the thigh of the seated person can be supported in a stable state.

  The seat member according to the present invention further includes a seat frame that supports the seat member and includes the downward displacement restricting portion, and the seat member is provided on an upper portion of the seat frame. May be formed.

  In the seat member configured as described above, the seat frame that supports the seat member functions as a strength member. Furthermore, when the downward displacement restricting portion, which is a part of the seat frame as the strength member, comes into contact with the seat surface member, the downward displacement of the seat surface member can be reliably restricted.

  In addition, a chair according to the present invention includes the seat member according to any one of the above, a leg portion that supports the seat member, and a backrest portion provided behind the seat member, and the seat The member is capable of flipping up the front end portion around the rear end portion with respect to the leg portion or the backrest portion, and the seat member includes a lower cover that covers a lower portion of the lower displacement restricting portion. Further, a protrusion projecting downward is formed on the lower surface of the lower cover, the leg has a support leg for supporting the protrusion, and the seat member has the front end forward. The protrusion and the downward displacement restricting portion are arranged vertically above the support leg at a position where they can be seated.

  In the chair configured as described above, when the seat member is rotated to a position where the front end portion of the seat member can be seated forward, the lower end of the lower cover is positioned vertically above the support leg of the leg portion. A ridge protruding downward is arranged. A downward displacement restricting portion that supports the seat member is disposed vertically above the protrusion. Therefore, since these protrusions and the downward displacement restricting portion absorb the impact between the support leg and the seat member when the seat member is rotated, the chair having excellent strength can be obtained.

  According to the seat member and the chair according to the present invention, a good sitting comfort can be achieved.

It is a front view of the chair which concerns on this embodiment. It is a right view of the chair which concerns on this embodiment. It is a right view which shows the state which flipped up the seat part upwards in the chair. It is a bottom view of a seat part. It is a sectional side view along the left-right direction center of a seat part. It is a figure which shows the seat part frame and lower cover which comprise a seat part, (a) is a perspective view which shows the state before mounting | wearing a lower part cover with a seat part frame, (b) has attached the seat part frame to the lower cover. It is a perspective view which shows the state which carried out. It is a figure which shows the base plate of the seat frame which comprises a seat part, a lower cover, and a seat surface member, and is AA arrow sectional drawing in FIG. It is a bottom view of a base board.

Hereinafter, a chair according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of a chair according to the present embodiment. FIG. 2 is a right side view of the chair according to the present embodiment.
As shown in FIGS. 1 and 2, the chair 1 is provided with a leg 10 placed on the floor, a seat (seat member) 20 supported by the leg 10, and a rear of the seat 20. The backrest 30 is provided.
In the following description, for the sake of convenience, the direction in which the chair user (sitting person) sitting on the backrest 30 on the seat 20 of the chair 1 faces forward is “front”, and the opposite direction is “rear”, that is, FIG. The direction orthogonal to the paper surface shown in FIG. Furthermore, the direction connecting the floor side on which the chair 1 is installed and the opposite side is referred to as the vertical direction, and the width direction of the chair 1, that is, the horizontal direction along the plane of FIG.

(leg)
The leg portion 10 is integrally provided with leg frames 11, 11 configured as a pair of left and right, and a front frame 12 that connects the left and right leg frames 11, 11. The leg 10 is formed of a tubular material made of a metal material.

  Each leg frame 11 includes a front leg 13 disposed at the front, a rear leg 14 disposed at the rear, and an upper connecting rod 15 that connects the upper part of the front leg 13 and the upper part of the rear leg 14 to each other. Have.

  The front leg 13 has a vertical portion 13a that extends vertically upward from the lower end thereof, and a skewed portion 13b that curves at the upper end of the vertical portion 13a and extends obliquely upward toward the rear. A caster 16 is attached to the lower end of the vertical portion 13 a of the front leg 13.

The rear leg 14 includes a vertical portion 14a that extends vertically upward from the lower end thereof, and a skew portion 14b that curves above the vertical portion 14a and extends obliquely upward toward the front. A caster 17 is attached to the lower end of the vertical portion 14 a of the rear leg 14.
Further, the rear leg 14 is integrally provided with an upward extending portion 18 that is continuous with the oblique portion 14b and extends obliquely upward.

  The upper connecting rod 15 is formed continuously with the upper end of the skewed portion 13b of the front leg 13, and is formed so as to curve upward at the upper end of the skewed portion 13b and gradually extend upward. The rear end 15b of the upper connecting rod 15 is joined to the upper portion of the oblique portion 14b of the rear leg 14 by welding, brazing or the like.

The front frame 12 is curved in the left-right direction by bending obliquely upward portions 12a, 12a extending obliquely upward from the upper ends of the oblique portions 13b, 13b of the left and right front legs 13, 13, and above the oblique portions 12a. A horizontal frame portion (support leg) 12b that extends in the (horizontal direction) and connects the oblique portions 12a and 12a is provided integrally. The lower end of each skewed portion 12a of the front frame 12 is joined to the upper end portion of the skewed portion 13b of the front leg 13 by welding or brazing.
By the front frame 12, the left and right leg frames 11, 11 are connected to each other at the front portion thereof. The front frame 12 plays a role of preventing the front legs 13 and 13 from spreading outward in the left-right direction when the weight of a user sitting on the seat portion 20 acts on the left and right front legs 13 and 13. .

In such a leg 10, the front legs 13 and the rear legs 14 of the left and right leg frames 11, 11 are formed so as to go outward in the left-right direction from the upper side to the lower side.
Further, in the left and right leg frames 11, 11, the left and right upper coupling rods 15, 15 are provided such that the distance between them gradually decreases from the rear end 15 b toward the front end 15 a. As a result, the left and right front legs 13, 13 have a smaller left-right spacing at the same height from the floor than the left and right rear legs 14, 14.

(Backrest)
The backrest 30 is formed of a resin material. The backrest 30 is a plate-like back body 31 that receives the back of a user seated on the seat 20, and a supported part that is provided at the lower portions of both ends of the back body 31 in the left-right direction and supported by the legs 10. 32.

  The back main body 31 is formed with a plurality of through holes 33 so as to bend according to a load acting from the back of the user. These through holes 33 may have any shape and layout. For example, the through-hole 33 can be a slit having a certain length extending in the vertical direction. The plurality of through holes 33 are arranged at intervals along the vertical direction. A plurality of such rows of through-holes 33 are arranged at intervals in the left-right direction. Here, the through holes 33 in adjacent rows may be arranged in a so-called staggered pattern so that their heights are different from each other.

  The supported portion 32 includes a recess (not shown) into which the upper extension portion 18 of the rear leg 14 is inserted from below. The left and right leg frames 11 of the leg portion 10 are inserted into the recesses (not shown) of the supported portion 32 provided at both left and right end portions of the backrest portion 30 by fitting the upper extending portions 18 on both sides in the left and right direction. , 11 are connected to each other via a back body 31.

  The backrest 30 is formed so as to incline backward as the upper part goes upward. Thereby, it is possible to more stably support the back of the user sitting on the seat portion 20.

  Further, the supported portion 32 of the backrest portion 30 is provided with a seat portion support portion 35 that gradually extends forward as it goes downward, and supports a seat portion 20 described later.

(Seat)
FIG. 3 is a side view showing a state in which the seat 20 is flipped upward in the chair 1. FIG. 4 is a bottom view of the seat portion 20. FIG. 5 is a side sectional view taken along the center of the seat portion 20 in the left-right direction. 6A and 6B are views showing a seat frame and a lower cover that constitute the seat 20, wherein FIG. 6A is a perspective view showing a state in which the seat frame 21 is attached to the lower cover 22, and FIG. It is a perspective view which shows the state which mounted | wore with the seat part flame | frame 21. FIG.
The seat portion 20 has a plate shape and is disposed so as to cover the upper left and right upper connecting rods 15 and 15 of the leg portion 10 and the front frame 12. Further, the seat portion 20 is rotatably connected to the seat portion support portion 35 on the rear end portion 20r side. Thereby, as shown in FIG. 3, the seat part 20 can flip up the front-end part 20f upwards.

  As shown in FIGS. 4 and 5, the seat 20 includes a seat frame 21, a lower cover 22 that covers the lower portion of the seat frame 21, and a seat member 23 that covers the upper portion of the seat frame 21. ing.

As shown in FIG. 6, the seat frame 21 supports the seat member 23 from below. The seat frame 21 includes a pair of left and right side frames 21a and 21a extending in the front-rear direction, a rear connecting rod 21b that connects the rear ends of the side frames 21a and 21a in the left-right direction, and the side frames 21a and 21a at the rear. And a front connecting rod (downward displacement restricting portion, engaged portion) 24 connected in the left-right direction in front of the connecting rod 21b. The seat frame 21 is formed of a tubular member made of a metal material.
The left and right side frames 21a are curved at the rear end and continue to the rear connecting rod 21b.

The front connecting rod 24 has an intermediate portion 24a extending in the left-right direction over a predetermined length, and extends obliquely upward from both ends of the intermediate portion 24a, and the tip portion is joined to the side frame 21a by welding, brazing, or the like. And a skewed portion 24b.
The front connection rod 24 is provided at a position behind the front end 21f of the side frames 21a on both sides by a predetermined dimension. Thereby, as for each side frame 21a, the front-end part 21f protrudes ahead rather than the front part coupling rod 24. FIG. Here, the front connecting rod 24 is preferably arranged at a position about 2/3 from the rear with respect to the length of the side frame 21a in the front-rear direction.

  The seat frame 21 further includes a support arm 25 extending upward from the rear end of each side frame 21a. The support arm 25 is formed of a plate-like material made of a metal material, and extends gradually toward the rear as it goes upward. As shown in FIG. 6A, the lower end 25a of the support arm 25 is formed to be curved along the outer peripheral surface of the side frame 21a, and is joined to the side frame 21a by welding, brazing, or the like. A through hole 25 h is formed in the upper end portion of the support arm 25 so as to penetrate in the thickness direction (left-right direction) of the support arm 25.

  The lower cover 22 is configured by molding a resin material into a predetermined shape as described later. The lower cover 22 includes a plate portion 22a that covers the lower portion of the seat portion frame 21, and an edge portion 22b that rises upward from the outer peripheral portion of the plate portion 22a.

  On the upper surface side of the plate portion 22a, the insertion portions 26 and 26 into which the front end portions 21f and 21f of the side frames 21a and 21a are inserted, the front recessed portion 27 in which the front connecting rod 24 is disposed, and the rear connecting rod 21b Is formed integrally with a rear recess 28 and a reinforcing rib 22L extending in the left-right direction along the edge 22b at the front end of the plate 22a.

The insertion portions 26 are formed on both sides in the left-right direction at the front end portion of the plate portion 22a. The insertion portion 26 has, for example, a rectangular parallelepiped shape, and has a bottomed insertion hole 26 s opened rearward. A front end 21f of the side frame 21a is inserted into the insertion hole 26s of the insertion portion 26 from the rear.
The front end portion 21f of the side frame 21a may be formed such that its outer dimension in the vertical direction gradually decreases toward the front. Accordingly, the front end portion 21f of the side frame 21a can be easily inserted into the insertion hole 26s.
In addition, a reinforcing rib 26L extending forward from the insertion portion 26 is provided on the plate portion 22a.

As shown in FIGS. 5 and 6 (b), the front concave portion 27 is formed in a state where the front end portions 21f of the left and right side frames 21a of the seat frame 21 are respectively inserted into the insertion holes 26s of the insertion portion 26. It is formed at a position facing the connecting rod 24. The front recess 27 is continuous in the left-right direction and is recessed downward. A plurality of convex portions 27 t projecting upward are formed at the bottom of the front concave portion 27 at intervals in the left-right direction. An intermediate portion 24 a of the front connecting rod 24 is inserted into the front concave portion 27. And when the intermediate part 24a hits the some convex part 27t, the downward movement of the front connection rod 24 is controlled.
Further, as shown in FIG. 5, on the lower surface 22 u side of the plate portion 22 a of the lower cover 22, a protrusion 50 that protrudes downward and is continuous in the left-right direction is formed by forming a front concave portion 27. Yes. A concave groove 51 that is concave upward is formed in the lower end portion of the protrusion 50 continuously in the left-right direction. Thereby, on both sides of the concave groove 51, convex portions 50t and 50t protruding downward are continuously formed in the left-right direction.

  As shown in FIG. 6 (b), the rear recess 28 includes the rear connecting rod 21b and its front end 21f in the state in which the front end portions 21f of the left and right side frames 21a of the seat frame 21 are respectively inserted into the insertion holes 26s of the insertion portion 26. It is formed to be recessed downward at a position facing the rear end of the side frames 21a, 21a continuous on both sides.

  On both sides in the left and right direction of the rear end portion of the lower cover 22, arm cover portions 29 are formed that continuously rise upward from the edge portion 22 b. The arm cover portion 29 is formed so as to gradually go rearward from the rear end portion of the lower cover 22 upward. The arm cover part 29 inserts the front end parts 21f of the left and right side frames 21a of the seat part frame 21 into the insertion holes 26s of the insertion part 26, and inserts the intermediate part 24a of the front connection rod 24 into the front concave part 27. In this state, the seat frame 21 is formed at a position along the support arm 25. As shown in FIG. 6A, the arm cover portion 29 is directed to the support arm 25 with a plate portion 29p along the outer side in the left-right direction and inward in the left-right direction along the outer peripheral side of the plate portion 29p. And a peripheral wall portion 29w that rises. Further, a through hole 29h is formed in the plate portion 29p of the arm cover portion 29 so as to penetrate in the thickness direction (left-right direction) of the plate portion 29p.

  As shown in FIG. 6B, the seat frame 21 inserts the front end portions 21 f of the left and right side frames 21 a of the seat frame 21 into the insertion holes 26 s of the insertion portion 26 with respect to the lower cover 22. At the same time, the left and right support arms 25 are mounted along the plate portion 29 p inside the peripheral wall portion 29 w of the arm cover portion 29. As a result, the lower cover 22 and the seat frame 21 are integrated. In this state, the intermediate portion 24a of the front connecting rod 24 is arranged in the front concave portion 27, and the rear connecting rod 21b and the rear end portions of the side frames 21a, 21a continuous on both sides thereof are arranged in the rear concave portion 28. Is done.

In this state, the front end portions 21 f of the left and right side frames 21 a are inserted into the bottomed insertion holes 26 s of the insertion portion 26 from the rear, so that the seat frame 21 is directed vertically with respect to the lower cover 22. Movement in the left-right direction and forward is restricted.
Further, since the support arms 25 on both the left and right sides are along the plate portion 29p of the arm cover portion 29, the seat frame 21 is restricted from moving in the left-right direction. Further, the support arms 25 on both the left and right sides are positioned inward of the peripheral wall portion 29w of the arm cover portion 29, whereby the range of movement of the support arm 25 in the vertical direction and the front-rear direction is restricted by the peripheral wall portion 29w. As a result, the range of movement of the rear end portion of the seat frame 21 in the vertical direction and the front-rear direction is restricted.
Further, in this state, the front connecting rod 24 is accommodated in the front concave portion 27 and abuts against the plurality of convex portions 27t. The movement of the seat frame 21 in the front-rear direction is suppressed by friction generated between the front connecting rod 24 and the plurality of convex portions 27t. Further, the amount of movement of the front connecting rod 24 in the front-rear direction is restricted within the range of the width of the front recess 27 in the front-rear direction. In this way, the movement of the seat frame 21 in the front-rear direction is limited.

FIG. 7 is a view showing the base frame 41 of the seat frame 21, the lower cover 22, and the seat member 23 constituting the seat 20, and is a cross-sectional view taken along the line AA in FIG.
As shown in FIG. 7, the inner cover 40 can be attached to the arm cover portion 29 of the lower cover 22. The inner cover 40 is disposed on the opposite side of the arm cover portion 29 with respect to the support arm 25. The inner cover 40 is mounted so as to close a space accommodating the support arm 25 inside the peripheral wall portion 29w of the arm cover portion 29. The inner cover 40 and the arm cover portion 29 can be engaged with each other by a locking claw or the like (not shown).
A through hole 40 h (see FIG. 5) is formed in the inner cover 40 at a position facing the through hole 29 h of the arm cover portion 29.

  As shown in FIG. 5, the seat member 23 receives a user's load. The seating surface member 23 includes a base plate 41, a cushion material 42, and a skin material 43.

FIG. 8 is a bottom view of the base plate 41.
As shown in FIG. 8, the base plate 41 is configured by molding a resin material into a predetermined shape. On the lower surface 41 u of the base plate 41, side holding portions 44 provided on both sides in the left-right direction, a front holding portion 45 provided behind the front end portion 41 f of the base plate 41, and a rear end of the base plate 41 And a rear holding portion 46 provided along the portion.

  The side holding portion 44 includes holding walls 44 a and 44 b that face in the left-right direction across the side frame 21 a of the seat frame 21. The holding wall 44a located outward in the left-right direction in the base plate 41 protrudes downward from the lower surface 41u of the base plate 41, and is formed continuously along the front-rear direction. In the base plate 41, the holding wall 44 b positioned inward in the left-right direction with respect to the holding wall 44 a is formed to protrude downward from the lower surface 41 u of the base plate 41.

  Further, the side holding portion 44 includes a pair of left and right clamp claws 47 and 47 in front and rear of the holding walls 44a and 44b, respectively. The clamp claws 47 are formed so as to protrude downward from the lower surface 41 u of the base plate 41. The clamp claws 47 are opposed to each other in the left-right direction with a width equal to the outer diameter of the side frame 21 a of the seat frame 21. And the latching claw (not shown) which protrudes in the direction which the clamp claws 47 and 47 oppose is formed in the front-end | tip part of the clamp claws 47 and 47, respectively. As a result, as shown in FIG. 7, the side frame 21 a of the seat frame 21 is fitted and held between the clamp claws 47.

  As shown in FIG. 8, the front holding portion 45 includes holding walls (rear displacement restricting portions) 45 a and holding walls (backward displacement restricting portions) that are opposed to each other with a space in the front-rear direction so that the front connecting rod 24 of the seat frame 21 enters. Forward displacement restricting portion) 45b. The holding walls 45a and 45b protrude downward from the lower surface 41u of the base plate 41 and are formed continuously along the left-right direction. As shown in FIG. 5, the holding wall 45b is disposed on the opposite side of the holding wall 45a with the front connecting rod 24 interposed therebetween. Then, with the front connecting rod 24 of the seat frame 21 entering the holding walls 45a and 45b of the front holding portion 45, between the front connecting rod 24 and the lower surface 41u of the base plate 41, A gap C1 is formed in the vertical direction. In this state, a gap CA is formed between the front connecting rod 24 and the holding wall 45a, and a gap CB is formed between the front connecting rod 24 and the holding wall 45b. . Note that the gaps CA and CB may not be formed, and the front connecting rod 24 and the holding walls 45a and 45b may be in contact with each other.

  As shown in FIG. 8, the rear holding portion 46 includes holding walls 46 a and 46 b that are opposed to each other with a space in the front-rear direction so that the rear connection rod 21 b of the seat frame 21 enters. The holding walls 46a and 46b protrude downward from the lower surface 41u of the base plate 41 and are formed along the left-right direction. As shown in FIG. 5, in a state where the rear connection rod 21b of the seat frame 21 has entered the holding walls 46a, 46b of the holding wall 46b, the rear connection rod 21b and the lower surface 41u of the base plate 41 are interposed. Is formed with a gap C2 in the vertical direction.

  As shown in FIG. 8, the base plate 41 is an area surrounded by the left and right side holding parts 44, 44, the front holding part 45, and the rear holding part 46, and is formed on the side frame 21 a of the seat part frame 21. In the load supporting region Sr, which is a supported region, in the thickness direction of the base plate 41, the region Sr is elastically deformed by a load acting from the user's buttocks and is bent downward. A plurality of through holes 41h are formed to penetrate therethrough. The load support region Sr is disposed on the center side of the base plate 41 in plan view. These through holes 41h may have any shape and layout. For example, a large number of through holes 41h may be arranged radially. Further, the through hole 41h may not be formed by forming the seat member 23 from a material that is more easily deformed or from a thin member.

  Further, in the base plate 41, the front region Sf on the front side of the load support region Sr is continuous in the front-rear direction between the holding wall 45a on the front side of the front holding unit 45 and the front end portion 41f of the base plate 41. A plurality of ribs 41L are provided at intervals in the left-right direction. Furthermore, a connecting wall 41w that is continuous in the left-right direction and connects the plurality of ribs 41L is formed integrally with the front end portion 41f of the base plate 41. Further, the rear end portion of each rib 41L is integrally joined to the holding wall 45a of the front holding portion 45.

  In this way, in the base plate 41, the load supporting region Sr and the front region Sf arranged on the front side of the load supporting region Sr are set so that the ease of occurrence of elastic deformation due to the load from above is different. ing. That is, in the base plate 41, the load support region Sr of the front holding portion 45 is easily bent downward according to the load acting from the user's buttocks when the user is seated. Further, in the base plate 41, the front region Sf of the front holding portion 45 can support the thigh of the seated person in a stable state by the plurality of ribs 41L.

  That is, the front region Sf is configured to be relatively less elastically deformed than the load support region Sr. Holding walls 45a and 45b are provided at a boundary portion Kf that is a boundary between the front region Sf and the load support region Sr.

Such a seating surface member 23 is mounted from above on the edge 22b of the lower cover 22 in which the seat frame 21 is set inward. The seat surface member 23 is integrally connected to the seat frame 21 by inserting and holding the side frames 21 a of the seat frame 21 to the front and rear clamp claws 47, 47 of the side holder 44.
In this way, in the seat portion 20, the lower cover 22 and the seat surface member 23 are integrally connected via the seat portion frame 21.

  Further, since the seat member 23 is provided in front of the front connecting rod 24 so as to cover the front end portions 21f, 21f of the pair of side frames 21a, 21a, the front end portion of the seat member 23 is idle. It becomes the end. As a result, when the seat surface member 23 and the seat frame 21 are integrally connected as described above, the front region Sf of the seat surface member 23 receives a load from the user who is seated on the front end portion. It becomes easy to elastically deform downward as it goes. Therefore, the front region Sf can flexibly support the thigh of the seated person.

  On the other hand, the front region Sf is configured to be less likely to be elastically deformed downward relative to the load support region Sr due to the structure of the base plate 41 itself. Therefore, in the front region Sf, excessive elastic deformation, damage due thereto, and aging deterioration can be prevented.

  The seat 20 has the seat surface member 23 mounted on the seat frame 21 and the lower cover 22, and the arm cover portion 29 and the inner cover 40 of the lower cover 22 that covers the support arm 25 and the inner arm 40 cover the seat surface member. It protrudes upwards from the left and right sides of the rear part of 23 respectively.

  Such a seat part 20 is rotatably connected to the left and right seat part support parts 35. For this purpose, bolts (not shown) are passed through the through holes 40h, 25h, 29h of the arm cover portion 29 of the inner cover 40, the support arm 25 and the lower cover 22, and the tip portions thereof are formed on the seat support portion 35. The screw holes (not shown) are fastened. In this way, the seat portion 20 has the rear end portion 20r side connected to the leg portion 10 so as to be rotatable, and the front end portion 20f can be flipped upward.

  As shown in FIG. 2, when the front end portion 20 f of the seat portion 20 is lowered, the groove 51 of the protrusion 50 formed on the lower surface side of the plate portion 22 a of the lower cover 22 forms the front frame 12 of the leg portion 10. Placed on the horizontal frame portion 12b. At this time, as shown in FIG. 5, the intermediate portion 24 a of the front connecting rod 24 of the seat frame 21 is inserted into the front concave portion 27 formed on the upper surface side of the lower cover 22. That is, the front connection rod 24 of the seat frame 21 is positioned vertically above the front frame 12 of the leg 10 via the lower cover 22.

Moreover, as shown in FIG. 3, in the state which raised the seat part 20 upwards, the several chair 1 can be superimposed on the front-back direction. Here, since the width of the leg portion 10 gradually decreases toward the front, the leg portion 10 is inserted inside the leg portion 10 of the front chair 1, thereby inserting the leg portion 10 of the rear chair 1. A plurality of chairs 1 can be superimposed in the front-rear direction.
Of course, the plurality of chairs 1 can also be stacked in the vertical direction. In this case, the front legs 13 and the rear legs 14 of the upper chair 1 disposed above are located above and in front of the front legs 13 and the rear legs 14 of the lower chair 1 disposed below. A plurality of chairs 1 can be stacked one after the other. A well-known structure can be adopted as a stackable structure.

  When a user sits on such a chair 1, due to the user's load, the seat portion 20 is elastically deformed with the skin material 43 and the cushion material 42 downward, and the base plate 41 is also elastically deformed downward. Bend. At this time, in the load support region Sr of the base plate 41, the entire base plate 41 bends downward, and within the front holding portion 45 and the rear holding portion 46 located at the front and rear ends of the load support region Sr of the base plate 41. Thus, when the base plate 41 abuts against and contacts the front connection rod 24 and the rear connection rod 21b, further downward displacement of the base plate 41 is restricted. Further, at both left and right end portions of the base plate 41, the base plate 41 abuts against the side frame 21 a of the seat frame 21 within the side holding portion 44, so that the downward displacement of the base plate 41 is restricted.

In addition, when a backward force is applied to the seat portion 20, the base plate 41 tends to be displaced rearward, but the retaining wall 45a of the front retaining portion 45 and the front connecting rod 24 that are displaced rearward are in contact with each other. Further contact with the base plate 41 is restricted by contact (see the two-dot chain line in FIG. 5).
In addition, when a forward force is applied to the seat portion 20, the base plate 41 tends to be displaced forward, but the retaining wall 45b of the front retaining portion 45 displaced forward and the front connecting rod 24 are in contact with each other. By further contact (see the two-dot chain line in FIG. 5), further forward displacement of the base plate 41 is restricted.
As a result, in the load support region Sr, the lower end of the seating surface is restricted to a certain degree or more at the outer peripheral portion to obtain a sense of rigidity, while the inner peripheral portion provides a sense of elasticity.

On the other hand, in the front region Sf, the rear portion is deformed so as to incline downward while the rearward displacement is restricted, and the thigh of the seated person is stabilized by the plurality of ribs 41L. Can be supported.
In this way, the user can obtain a good and stable seating feeling.

  Further, when the base plate 41 is bent downward as described above due to the user's load, the base plate 41 is bent downward at the inner peripheral portion of the base plate 41, so that the outer peripheral portion of the base plate 41 becomes the inner peripheral portion. Displacement that is pulled to the side occurs. With respect to such displacement, the front holding portion 45 is provided with a plurality of ribs 41L in front of the holding wall 45a, so that the rigidity of the holding wall 45a can be increased and a large resistance against displacement can be exhibited.

(Assembling method of chair)
Next, a method for assembling the chair 1 as described above will be described.
As shown in FIG. 6A, to assemble the seat portion 20, the seat frame 21 is inserted into the lower cover 22 obliquely downward from the rear, and the front ends of the left and right side frames 21 a of the seat frame 21. The portions 21f are inserted into the insertion holes 26s of the insertion portion 26, respectively. In parallel with the insertion operation of the front end portion 21f of the side frame 21a, the rear end portion 21r of the seat frame 21 is lowered downward. For this, the arm cover portions 29 on both sides of the lower cover 22 are elastically deformed so as to spread outward in the left-right direction, and the support arms 25 on both sides of the seat frame 21 are dropped into the arm cover portion 29. Thereafter, when the hand is released from the arm cover part 29, the arm cover part 29 is restored inward in the left-right direction. Then, as shown in FIG. 6B, the left and right support arms 25 enter the inside of the peripheral wall portion 29 w of the arm cover portion 29 and follow the plate portion 29 p. As a result, the lower cover 22 and the seat frame 21 are integrated.

  Next, the seat member 23 is mounted from above on the edge 22b of the lower cover 22 with the seat frame 21 set inward. The seat surface member 23 is integrally connected to the seat frame 21 by inserting and holding the side frames 21 a of the seat frame 21 in the front and rear clamp claws 47, 47 of the side holder 44.

  The seat part 20 assembled in this way is connected to the left and right seat part support parts 35. For this purpose, bolts (not shown) are passed through the through holes 40h, 25h, 29h of the arm cover portion 29 of the inner cover 40, the support arm 25 and the lower cover 22, and the tip portions thereof are formed on the seat support portion 35. Fastened to a screw hole (not shown).

The backrest part 30 is an upper extension part 18 that extends obliquely rearward at the rear part of the leg part 10 in recesses (not shown) of the supported part 32 provided at both right and left ends of the backrest part 30. Insert.
In this way, the chair 1 can be assembled.

  According to the chair 1 described above, the load supporting region Sr that supports the seated person's buttocks is greatly elastically deformed and bent, and is greatly displaced downward. Thereby, in the boundary part Kf arrange | positioned ahead of the load support area | region Sr, the lower surface 41u of the base board 41 contact | abuts with the front part coupling rod 24 arrange | positioned in front of the load support area | region Sr. In other words, the portion of the seat member 23 that contacts the front connecting rod 24 is arranged on the front side of the load support region Sr that supports the seated portion of the seated person. Therefore, since the feeling of contact between the front connecting rod 24 and the base plate 41 is difficult to be transmitted to the load support region Sr that supports the seated person's buttocks, a good sitting comfort can be achieved.

  Further, in the state where the front connecting rod 24 and the base plate 41 are in contact with each other and the downward displacement of the base plate 41 is restricted, the load support region Sr supports the seated person's buttocks and the seat portion 20 is downward. And deforms so as to wrap the buttocks of the seated person from below. On the other hand, in the front region Sf, the thigh of the seated person is supported, and the front part of the seat part 20 is deformed so as to be inclined downward. Therefore, since the seat part 20 can deform | transform along the site | part of a seated person's body, it can be set as favorable seating comfort.

In addition, when a backward force is applied to the seat portion 20, the base plate 41 tends to be displaced rearward, but the retaining wall 45a of the front retaining portion 45 and the front connecting rod 24 that are displaced rearward are in contact with each other. By contact, further displacement of the base plate 41 to the rear is restricted. As a result, the load support region Sr is displaced downward most to support the seated person's buttocks, and the seat 20 is deformed downward so as to wrap the seated person's buttocks from below. On the other hand, in the front region Sf, the front part is deformed so as to incline downward in a state in which the rearward displacement is restricted, so that the thigh of the seated person is not easily displaced in the front-rear position. It can be supported in a state.
Further, the contact position between the front connecting rod 24 and the holding wall 45a can be a clear fulcrum when the front portion of the front region Sf is deformed so as to be inclined downward. Therefore, only in a limited range of the front region, the front part can be displaced so as to incline downward according to the thigh of the seated person, and the seat part 20 can be further moved along the body part of the seated person. Can be deformed.
As described above, the load support region Sr and the front region Sf can be independently deformed and displaced in accordance with the acting force.

  Further, depending on the direction and magnitude of the load applied to the seat portion, the base plate 41 is not displaced vertically downward, but is displaced so that the rear portion is inclined downward, and the front connecting rod 24 is moved to the lower surface of the base plate 41. Even when it comes into contact with the holding wall 45a before 41u, the direction of displacement can be pulled back vertically downward.

  Further, since the holding wall 45a extends in the left-right direction, the rearward displacement of the base plate 41 is restricted over the left-right direction of the base plate 41. Therefore, the load support region Sr and the front region Sf can be clearly distinguished in the left-right direction. Therefore, only in a limited range of the front region Sf, the front portion can be displaced so as to be inclined downward according to the thigh of the seated person.

  Further, since the rib 41L extending in the front-rear direction is provided on the front side of the holding wall 45a of the base plate 41, the rigidity in the front region Sf is increased and deformation due to the load of the seated person is suppressed. Therefore, the front region Sf can be deformed along the thigh of the seated person without being affected by the displacement of the load support region Sr.

  Further, when the load acting on the seat portion 20 is removed, the seat portion 20 is displaced so as to separate the holding wall 45a from the front connecting rod 24, and tries to return to the initial position before the load acts. At this time, since the front connecting rod 24 is disposed between the holding wall 45a and the holding wall 45b, the front connecting rod 24 is positioned with respect to the base plate 41. Therefore, since the displacement amount of the seat part 20 when the seat part 20 tries to return to an initial position is suppressed, deterioration of the seat part 20 can be suppressed.

  Further, depending on the direction and magnitude of the load applied to the seat portion, the base plate 41 is not displaced vertically downward, but is displaced so that the front portion is inclined downward, so that the front connecting rod 24 of the base plate 41 is displaced. Even when it comes into contact with the holding wall 45b before the lower surface 41u, the direction of displacement can be pulled back vertically downward. Thereby, in the load support area Sr, the forward displacement is regulated, the seated person's buttocks are supported, and the seat part 20 is deformed so as to bend downward and wrap the seated person's buttocks from below. On the other hand, in the front region Sf, it is possible to support the seated person's thigh in a stable state by being deformed so that the front portion is inclined downward in a state where forward displacement is restricted. .

  Further, when the seat portion 20 is rotated to a position where the front end portion 20f of the seat portion 20 can be seated forward, the lower portion of the lower cover 22 is located vertically above the horizontal frame portion 12b of the leg portion 10. A protrusion 50 protruding downward is disposed. Further, a front connecting rod 24 that supports the seat member 23 is disposed vertically above the protrusion 50. Therefore, since the protrusion 50 and the front connecting rod 24 absorb the impact between the horizontal frame portion 12b and the seat portion 20 when the seat portion 20 is rotated, the chair 1 having excellent strength can be obtained.

(Modification)
In addition, the chair of this invention is not limited to the above-mentioned embodiment described with reference to drawings, Various modifications can be considered in the technical scope.
For example, in the embodiment described above, the rib 41L is provided in the front region Sf of the base plate 41, but the present invention is not limited to this, and the rib 41L may not be provided.

  Further, in a state where the user is not seated on the seat portion 20, the left and right end portions of the rear connection rod 21 b or the front connection rod 24 may be in contact with or close to the base plate 41.

In addition, the configuration of each part of the chair 1 including the configuration of the seat frame 21 and the lower cover 22 may be appropriately replaced with another configuration depending on design matters.
In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

1 Chair 10 Leg 12b Horizontal frame (support leg)
20 Seat (seat member)
20f front end 20r rear end 21 seat frame 21a side frame 21b rear connecting rod 21f front end 21r rear end 22 lower cover 23 seat surface member 24 front connecting rod (downward displacement restricting portion, engaged portion, rearward displacement Regulatory measures)
25 support arm 26 insertion portion 26s insertion hole 27 front recess 29 arm cover portion 30 backrest portion 41L ribs 44a and 44b holding wall 45a holding wall (rear displacement restricting portion, rear displacement restricting means)
45b Holding wall (front displacement restricting part)
46a, 46b Holding wall 47 Clamp claw 50 Projection Kf Boundary part Sf Front side area Sr Load support area

Claims (8)

A seat member of a chair that supports a seated person,
A seat member that is elastically deformed so as to bend downward by receiving the load of the seated person;
A downward displacement restricting portion that is arranged to be spaced apart downward from the seat surface member, and regulates the downward displacement of the seat surface member by the elastic deformation and contact of the seat surface member;
The seat member includes a load supporting region that can be elastically deformed by the load of the seated person, and a front region that is disposed on the front side of the load supporting region and is less likely to be elastically deformed relative to the load supporting region. Have
The lower displacement restricting portion is disposed on the front side of the load support region in a plan view of the seat member.   It further comprises rear displacement restricting means that is disposed at a boundary portion between the load supporting region and the front region of the seat member and restricts rearward displacement of the seat member due to the load of the seated person. The seat member according to claim 1. The backward displacement regulating means is
A rear displacement restricting portion extending downward from the lower surface of the seat member;
Engaging with the rear displacement restricting portion, and having an engaged portion for restricting rearward displacement of the seat surface member,
The seat member according to claim 2, wherein the downward displacement restricting portion also serves as the engaged portion.   The seat member according to claim 3, wherein the rear displacement restricting portion extends in a left-right direction of the seat surface member.   The seat member according to claim 3 or 4, wherein the seat surface member is provided with a rib extending in the front-rear direction on the front side of the rear displacement restricting portion.   The said seat surface member has the front displacement control part positioned with respect to the said downward displacement control part on the opposite side to the said back displacement control part on both sides of the said downward displacement control part. The seat member according to any one of the above. A seat frame that supports the seat member and has the downward displacement restricting portion;
The seat member according to claim 1, wherein the seat member is provided on an upper portion of the seat frame and forms a seat surface. A seat member according to any one of claims 1 to 7,
Legs supporting the seat member;
A backrest provided at the rear of the seat member,
The seat member is capable of flipping up the front end portion around the rear end side with respect to the leg portion or the backrest portion,
The seat member further includes a lower cover that covers a lower portion of the lower displacement restricting portion,
On the lower surface of the lower cover, a protrusion protruding downward is formed,
The leg portion has a support leg for supporting the protrusion,
The chair, wherein the protrusion and the downward displacement restricting portion are arranged vertically above the support leg at a position where the seat member can be seated with the front end facing forward.