JP6443962B2 - Chair - Google Patents

Description

  The present invention relates to a chair.

  Generally, a chair includes a leg portion, a seat portion supported by the leg portion, and a backrest portion provided behind the seat portion. In such a chair, there is a chair that is pivotally connected to a rear end portion, a leg portion, or a backrest portion of the seat portion so that the front end portion side of the seat portion can be flipped upward. Such a chair can suppress the storage space of the chair when not in use by overlapping a plurality of chairs in the front-rear direction in a state where the seat is flipped up.

  Patent Document 1 discloses a configuration in which a concave portion is formed on the bottom surface of a seat portion, and a portion of the backrest of another chair in front is accommodated in the concave portion facing forward with the seat portion flipped up. . According to such a structure, the storage space of the chair when not in use can be further suppressed by storing a part of the backrest portion of the front chair in the recess of the rear chair.

Japanese Patent No. 4144007

  However, in the configuration disclosed in Patent Document 1, the concave portion is formed in the central portion of the seat portion in the front-rear direction. Thus, if a recessed part is formed in the bottom face of a chair, the protrusion which protrudes upwards by a recessed part will be formed in the seat surface side of a chair. Then, when the user of the chair sits on the seat, the presence of the protrusion may be felt through a cushion or the like provided on the seat surface, and the seating feeling may be impaired. Further, when the chair is used for a long period of time, the cushion is repeatedly pressed by the protrusions, and the cushion is deteriorated.

  An object of the present invention made there is to provide a chair that can suppress the deterioration of the chair without impairing the sitting feeling.

The present invention employs the following means in order to solve the above problems.
The chair according to the present invention includes a seat portion on which a user sits, a leg portion that supports the seat portion, and a backrest portion that is provided behind the seat portion, and the seat portion is the leg portion. Alternatively, the chair is connected to the backrest portion so that the front end portion can be flipped upward with the rear end side as a center, and the leg portion includes a pair of left and right leg frames and a pair of the leg frames. A front frame that connects the front portions , and the seat portion includes a seating member having a rear end portion rotatably connected to the leg portion or the backrest portion, and a lower portion of the seating member. A lower cover that covers the lower end of the seating member, and a support arm that extends upward and is pivotally connected to the leg portion or the backrest portion. the bottom surface of the cover, with the flipped up the seat backrest lower end of the chair When a position facing in the longitudinal direction, the backrest portion recess for accommodating the lower end portion of the other of said chair is placed in front of the lower cover is formed, the bottom surface of the lower cover, the seat A concave groove that is placed on the front frame with the front end lowered is formed .

According to such a configuration, at least a part of the backrest portion of the other chair disposed in front of the lower cover in a state where the seat portion is flipped up, is on the bottom surface of the lower cover of the chair on the rear side. It is accommodated in the formed recess. Thereby, when the plurality of chairs are overlapped in the front-rear direction, the storage space for the plurality of chairs can be suppressed.
And since the recessed part is formed in the rear-end part of the seat part of a chair, the processus | protrusion formed in the side facing a seating member in a lower cover by forming a recessed part is in the rear-end part vicinity of a seat part. Will be located. The deformation of the seating member toward the lower cover caused when the user sits on the seating member of the seating part is small in the outer peripheral part of the seating member. Therefore, the seating member is less likely to interfere with the protrusion. Thereby, when the user of the chair is seated on the seat, it is difficult to feel the presence of the protrusion through the seating member. Further, when the chair is used for a long period of time, it is possible to suppress the seating member from being repeatedly pressed by the protrusion.
Further, in comparison with the case where the rear end portion of the seat portion is directly connected to the leg portion or the backrest portion without providing the support arm, the support arm is provided in the state where the front end portion of the seat portion is flipped upward. The entire seat will be positioned higher. Then, in a state where the front end portion of the seat portion is flipped upward, a concave portion that accommodates a part of the backrest portion can be formed at a lower position, that is, in the vicinity of the rear end portion of the seat portion.

The seating member has a rear end portion, and rotatably linked seat frame to the backrest portion provided on the rear of the leg or the deposition seat member of the chair supporting the wearing seat member A seating surface member that covers an upper part of the seating frame, and is formed on the facing surface by the concave portion formed on the bottom surface on the facing surface of the lower cover facing the seating frame. between the rear end portion of said the projection lower cover may be a frame accommodating recess portion is accommodated in said seat frame is formed.
As a result, the seat frame can be accommodated behind the protrusion formed on the opposing surface by the recess, and the space can be used effectively. In addition, when the seat member is deformed due to a load, the seat member abuts against the seat frame, so that the projection is arranged in the vicinity of the seat frame, so that the seat member does not easily interfere with the projection. .

The backrest portion may be formed such that an upper end portion and a lower end portion are curved backward.

  According to the chair of the present invention, even if the seating member is deformed by the action of a load, the projection formed on the side facing the seating member of the lower cover is less likely to interfere with the concave portion on the bottom surface side, so that the seating feeling is improved. It is possible to suppress the deterioration of the chair without damaging it.

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. It is a side view which shows the state which piled up the some chair in the front-back direction in the state which raised the seat part.

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 includes a leg 10 placed on the floor, a seat 20 supported by the leg 10, and a backrest provided behind the seat 20. Part 30.
In the following description, for the sake of convenience, the direction in which the chair user 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, on the paper surface shown in FIG. The orthogonal direction is referred to as the front-rear direction. 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 skew portion 13b of the front leg 13, and is formed so as to curve upward at the upper end of the skew 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 12b that extends in the (horizontal direction) and connects the skewed portions 12a and 12a is integrally provided. 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 the 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 distance in the left-right direction 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 the 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 has an upper end 31a and a lower end 31b that are curved toward the rear. Thereby, the back main body 31 is configured so that the upper end 31a and the lower end 31b do not bite into the back along the back of the user when the user drowns. Due to the shape of the back main body 31, the upper end 31 a and the lower end 31 b protrude rearward on the rear surface side of the back main body 31.

  The back main body 31 is formed with a plurality of through holes 33 so as to bend in accordance with 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. Here, the seat frame 21 and the seat member 23 constitute a seating member.

As shown in FIG. 6, the seat frame 21 functions as a strength member that supports a load when a user is seated on the seat 20. 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 24 that is connected to the front side of the connecting rod 21b in the left-right direction. 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 bottom 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 inserted into the insertion holes 26s of the insertion portion 26, respectively. 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 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. 4.
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 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 from the lower surface of the base plate 41 and is formed continuously along the front-rear direction. In the base plate 41, a holding wall 44 b positioned inward in the left-right direction with respect to the holding wall 44 a is formed to protrude 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 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 45 a and 45 b facing each other with a space in the front-rear direction so that the front connecting rod 24 of the seat frame 21 enters. The holding walls 45a and 45b protrude downward from the lower surface of the base plate 41 and are continuously formed along the left-right direction. As shown in FIG. 5, the front connection rod 24 and the lower surface of the base plate 41, with the front connection rod 24 of the seat frame 21 entering the inside of the holding walls 45 a and 45 b of the front holding portion 45, A gap C1 is formed in the vertical direction between the two.

  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 of the base plate 41 and are formed along the left-right direction. As shown in FIG. 5, with the rear connecting rod 21 b of the seat frame 21 entering the holding walls 46 a and 46 b of the rear holding portion 46, the rear connecting rod 21 b and the lower surface 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 rear region Sr, which is a supported region, a plurality of through the base plate 41 in the thickness direction so as to help the region Sr bend downward according to the load acting from the user's buttocks. The through-hole 41h is formed. 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.

  The base plate 41 has ribs 41L continuous in the front-rear direction between the front holding wall 45a of the front holding portion 45 and the front end portion 41f of the base plate 41 with a gap in the left-right direction. A plurality are provided. 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, the base plate 41 is set so that the ease of occurrence of elastic deformation due to the load from above differs between the front region Sf and the rear region Sr. That is, in the base plate 41, the rear 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 41 of the front holding portion 45 is less likely to bend the front end portion 41f of the base plate 41 downward by a plurality of ribs 41L due to a load acting from the user's thigh.

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, in the state where the seat member 23 and the seat frame 21 are integrally connected as described above, the front region Sf of the seat member 23 receives a load from the user who is seated on the front end. 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 rear 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.

FIG. 9 is a side view showing a state in which a plurality of chairs 1 are overlapped in the front-rear direction with the seat portion 20 flipped up.
As shown in FIG. 9, in a state where the seat portion 20 is flipped upward, the plurality of chairs 1 can be superimposed in the front-rear 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.

As shown in FIGS. 5 and 6, a recess 60 that is recessed toward the seat member 23 is formed near the rear end 22 r of the bottom surface 22 u of the lower cover 22. The recess 60 is formed outside the main load support region Sx that receives a main load that acts when a user sits on the seat portion 20.
As shown in FIG. 9, the recess 60 has a lower end 31 b of the back body 31 of the backrest 30 of the other chair 1 disposed in front of the lower cover 22 in a state where the seat 20 is flipped up. Be contained. Thereby, when the plurality of chairs 1 are overlapped in the front-rear direction, the storage space for the plurality of chairs 1 is suppressed.

Further, as shown in FIGS. 5 and 6, the facing surface 22t on the side facing the seat member 23 in the lower cover 22 is formed on the side facing the seat member 23 by forming a recess 60 in the bottom surface 22u. A protruding protrusion 61 is formed. Since the recess 60 is formed in the vicinity of the rear end portion 22r of the lower cover 22, the protrusion 61 is positioned in the vicinity of the rear end portion 20r of the seat portion 20.
The opposing surface 22t of the lower cover 22 is formed with a frame accommodating recess 63 for accommodating the rear connection rod 21b of the seat frame 21 between the edge 22b of the rear end 22r and the protrusion 61. Yes.

When the user sits on such a chair 1, the skin member 43 and the cushion material 42 are elastically deformed downward and the base plate 41 is also bent downward by the load of the user. At this time, in the rear region Sr of the base plate 41, the entire base plate 41 bends downward,
When the base plate 41 comes into contact with the front connecting rod 24 and the rear connecting rod 21b in the front holding portion 45 and the rear holding portion 46 located at the front and rear ends of the rear region Sr of the base plate 41, the base plate 41 is larger than that. The downward displacement of 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. On the other hand, in the rear region Sr, a portion of the base plate 41 where the plurality of through holes 41h are formed can be further bent downward.
Therefore, in the rear region Sr, the lower end of the seat surface is restricted to a certain degree at the outer peripheral portion to obtain a sense of rigidity, while the inner peripheral portion provides a sense of elasticity. In addition, in the front region Sf, the plurality of ribs 41L make it difficult for the front end portion 41f of the base plate 41 to bend downward due to a load acting from the user's thigh.
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 load of the user, 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.

  Moreover, in the seat part 20, a load acts as a main load from the user's buttocks and thighs seated on the seat part 20. The deformation of the seat member 23 toward the lower cover 22 due to the main load mainly occurs in the main load support region Sx ahead of the rear end portion 20r of the seat portion 20, and the outer peripheral portion of the main load support region Sx, that is, The rear end portion 20r has a small amount of deformation. In this manner, by forming the recess 60 at a position that is external when the seat portion 20 is viewed in plan with respect to the main load support region Sx, when the seat surface member 23 is deformed downward by the load, the projection 61 Reduce interference.

(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 backrest portion 30 of the other chair 1 disposed in front of the lower cover 22 with the seat portion 20 flipped up in the vicinity of the rear end portion 22r of the bottom surface 22u of the lower cover 22. A recess 60 for accommodating the rear connecting rod 21b is formed. According to such a configuration, in the state where the seat portion 20 is flipped up, the back connection portion 21b of the backrest portion 30 of the other chair 1 arranged in front of the lower cover 22 is located below the chair 1 on the rear side. The cover 22 is accommodated in a recess 60 formed in the bottom surface 22u. Thereby, when the plurality of chairs 1 are overlapped in the front-rear direction, the storage space of the plurality of chairs 1 can be suppressed.
And the recessed part 60 is formed outside the planar view of the seat part 20 with respect to the main load supporting region Sx that receives the main load acting on the seat part 20 near the rear end part 22r of the lower cover 22. . For this reason, the protrusion 61 is positioned in the vicinity of the rear end portion 20r of the seat portion 20. The deformation of the seat member 23 toward the lower cover 22 caused by the user sitting on the seat member 23 of the seat 20 is small in the vicinity of the rear end 20r of the seat 20. Therefore, the seat member 23 is less likely to interfere with the protrusion 61.
In this way, even if the seat member 23 is deformed by the action of the load, the protrusion 61 formed on the side of the lower cover 22 facing the seat member 23 is less likely to interfere by the recess 60 on the bottom surface 22u side. The deterioration of the chair 1 can be suppressed without impairing the sitting feeling.

  In addition, the rear connection rod 21b of the seat frame 21 is accommodated between the protrusion 61 and the rear end 22r of the lower cover 22 on the facing surface 22t on the side facing the seat frame 21 in the lower cover 22. A frame housing recess 63 is formed. Thereby, the seat part frame 21 can be accommodated behind the protrusion 61, and the space can be effectively used. In addition, when the seat member 23 is deformed due to a load acting, the seat member 23 abuts against the rear connecting rod 21b of the seat frame 21, so that the protrusion 61 is disposed in the vicinity of the seat frame 21. The seat member 23 is less likely to interfere with the protrusion 61.

  Furthermore, a support arm 25 is provided at the rear end 21r of the seat frame 21 and extends upward and is connected to the leg 10 or the backrest 30 so as to be rotatable. Compared to the case where the rear end portion 20r of the seat portion 20 is directly connected to the leg portion 10 or the backrest portion 30 without providing the support arm 25, the rear end portion 20r of the seat portion 20 is formed by providing the support arm 25. The seat portion 20 rotates in a state of being located on the outer peripheral side from the rotation center. Therefore, the whole seat part 20 will be located in the upper part in the state which bounced up the front-end part 20f of the seat part 20. FIG. Then, with the front end portion 20f of the seat portion 20 flipped upward, the recess portion 60 that accommodates the rear connection collar 21b of the backrest portion 30 is formed at a lower position, that is, in the vicinity of the rear end portion 20r of the seat portion 20. It becomes possible to do. Thereby, as described above, the recess 60 can be formed in the vicinity of the rear end 20r of the seat portion 20, and interference between the seat surface member 23 and the protrusion 61 can be suppressed.

(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, as long as the recessed part 60 is formed in the seat part 20, about the structure of another part, it does not limit at all.

  Moreover, in the said embodiment, although the seating member is comprised from the seat part frame 21 and the seat surface member 23, it can also be set as the structure which integrated these. Moreover, the structure which covers the lower part of the seat surface member 23 with the lower cover 22 which functions as an intensity | strength member which supports a load may be sufficient. In this case, it is possible to flexibly configure at least the base end portion of the arm cover portion 29 so as to be elastically deformable by means such as two-color molding that combines two types of materials and integrally molds them.

In addition, the structure of each part of the chair 1 including the structure of the leg part 10 and the backrest part 30 may be appropriately replaced with another structure 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.

DESCRIPTION OF SYMBOLS 1 Chair 10 Leg part 20 Seat part 20f Front end part 20r Rear end part 21 Seat part frame (sitting member)
21r Rear end 22 Lower cover 22r Rear end 22t Opposing surface 22u Bottom 23 Seat member (sitting member)
25 Support arm 30 Backrest part 60 Recess 61 Protrusion 63 Frame accommodation recessed part Sx Main load support area

Claims (3)

A seat portion on which a user is seated; a leg portion that supports the seat portion; and a backrest portion that is provided behind the seat portion, wherein the seat portion is relative to the leg portion or the backrest portion. The chair is connected so that the front end portion can be flipped up around the rear end side,
The legs are
A pair of left and right leg frames;
A front frame that connects the front portions of the pair of leg frames, and
The seat is
A seating member whose rear end is rotatably connected to the leg or the backrest;
A lower cover that covers a lower portion of the seating member,
A support arm is provided at the rear end of the seating member and extends upward and is rotatably connected to the leg or the backrest.
On the bottom surface of the lower cover, the other chair disposed in front of the lower cover is located at a position facing the lower end portion of the backrest portion of the chair in the front-rear direction with the seat portion being flipped up. A recess for accommodating a lower end portion of the backrest portion is formed,
The bottom surface of the lower cover is formed with a concave groove that is placed on the front frame in a state where the front end portion of the seat portion is lowered . The seating member has a rear end portion, and rotatably linked seat frame to the backrest portion provided on the rear of the leg or the deposition seat member of the chair supporting the wearing seat member And a seat member that covers an upper part of the seat frame,
Wherein the lower cover facing surface of the side opposed to said seat frame, between the rear end portion of the lower cover and the protrusion formed on the facing surface by the recess formed in the bottom surface, said seat The chair according to claim 1, wherein a frame housing recess for housing a part of the frame is formed.   The chair according to claim 1 or 2, wherein the backrest portion is formed such that an upper end portion and a lower end portion are curved backward.