JP2016013309A - Seat member and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve seating feelings while maintaining sufficient strength of a seat part of a chair.SOLUTION: A seat part frame 21 configuring a seat part 20 of a chair includes: a pair of side frames 21a, 21a extending in a back and forth direction; a rear coupling rod 21b coupling rear ends 21r, 21r of the side frames 21a, 21a; and a front coupling rod 24 coupling the side frames 21a, 21a ahead of the rear coupling rod 21b and at the back of front end parts 21f, 21f of the side frame 21a, 21a. The seat surface member 23 is provided in the way that it covers a part between the pair of side frames 21a, 21a in a total length from the front end parts 21f of the pair of side frames 21a to the rear ends 21r.

Description

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

  In general, a chair includes a leg portion and a seat portion supported by the leg portion. In such a chair, there is a chair having a seat provided with a frame provided on the leg and a seat member that is supported by the frame and forms a seat (for example, see Patent Documents 1 and 2). ). In the seat portions of these chairs, the frame is formed in a rectangular shape along the outer peripheral portion of the seat portion, and supports a load acting on the seat surface.

  Patent Document 3 discloses a configuration in which a front member located at the front end portion of the frame is arranged behind the front end portion of the seat portion. Furthermore, in this structure, the front rib which continues in the front-back direction is provided in the front-end part of the seat surface member, and this front rib has contacted the front member from the front.

JP 2003-88442 A Japanese Patent No. 4518603 JP 2009-106422 A

  By the way, in the seat part of a chair, while the intensity | strength which supports the load by the user who seats reliably is calculated | required, favorable seating feeling is calculated | required.

  In the configurations disclosed in Patent Documents 1 and 2, since the frame is provided along the outer peripheral portion of the seat portion, it is easy to ensure sufficient support strength. However, since the strength of the outer peripheral portion of the seat portion is enhanced by the frame, the seat surface may be hard and feel flat to the user.

On the other hand, in the configuration disclosed in Patent Document 3, the front member located at the front end portion of the frame is disposed behind the front end portion of the seat portion. Sufficient support strength is ensured in the region that mainly supports. The region that supports the load from the user's thighs ahead of the front member of the seat does not have a frame, so the seat member is allowed to flex downward according to the load, and the seating feeling Can be improved.
On the other hand, in the configuration disclosed in Patent Document 3, it is formed at the front end portion of the seat surface member in order to prevent the seat surface member from being damaged when an excessive load is applied to the front end portion of the seat surface. The front rib increases the strength of the front end of the seat member. However, the strength may be insufficient only by providing the front rib. Furthermore, by providing the front rib, the seat surface member is also inhibited from bending downward according to the load.

  An object of the present invention made there is to provide a seat member and a chair capable of improving the seating feeling while sufficiently ensuring the strength of the seat portion of the chair.

The present invention employs the following means in order to solve the above problems.
The seat member according to the present invention is a seat member of a chair that supports a seated person, and is provided on a leg portion of the chair and an upper portion of the seat frame to form a seat surface. A seat surface member, and the seat frame includes a pair of side frames extending in the front-rear direction, a rear connecting rod that connects rear end portions of the side frames, and a front side of the rear connecting rod, and A front connecting rod that connects the side frames behind the front end of the side frame, and the seat member extends over the entire length from the front end to the rear end of the pair of side frames. It is provided so that it may cover between a pair of said side frames.

According to such a configuration, the seat member is supported by the pair of side frames in a region in front of the front connecting rod. As a result, the seat member has sufficient strength at the portion supported by the side frame, and is easily elastically deformed in the direction perpendicular to the seat surface at the intermediate portion between the side frames. In particular, since the front end portion of the seat member becomes a free end portion, elastic deformation in a direction in which the front end portion is bent downward is promoted. Therefore, the thigh of the seated person can be softly supported.
Further, the area behind the front connecting rod is surrounded by the pair of side frames, the front connecting rod, and the rear connecting rod constituting the seat frame, so that the area ahead of the front connecting rod is included. Compared to the above, it is difficult to elastically deform in the direction orthogonal to the seating surface, and sufficient support strength can be obtained.

Further, the seat member may be provided with a rib continuous in the front-rear direction in front of the front connecting rod.
Thereby, in the seat surface member, it is possible to reinforce the deformation in the direction in which the front end portion of the seat surface member descends downward, particularly in the region in front of the front connecting rod. Accordingly, it is possible to suppress an excessive deformation of a portion that is easily deformed in structure.

Further, the front connecting rod may include a supported portion that is disposed and supported vertically above a support frame that is provided on the leg portion and supports the seat member.
As a result, the load is efficiently transmitted from the front connecting rod of the seat frame to the support frame of the leg portion vertically below, and the support strength of the seat is increased.

Further, a lower cover that covers a lower portion of the seat frame may be further provided, and at least front ends of the pair of side frames may be fixed to the lower cover, respectively.
Thus, by fixing the front-end part of a side frame to a lower cover, a seat part frame and a lower cover are integrated, and a seat surface member can be supported reliably.

The chair concerning this invention is provided with the above-mentioned leg part, the above-mentioned seat member, and the backrest part provided in the back of the above-mentioned seat member, It is characterized by the above-mentioned.
According to such a configuration, the seating surface member has sufficient strength at the portion supported by the side frame, and is easily elastically deformed in a direction perpendicular to the seating surface at an intermediate portion between the side frames. In addition, the region behind the front connecting rod is less likely to be elastically deformed in the direction perpendicular to the seat surface than the region ahead of the front connecting rod, and sufficient support strength can be obtained.

  According to the seat member and chair according to the present invention, it is possible to improve the seating feeling while sufficiently securing the strength of the seat portion of the chair.

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 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 a pair of left and right leg frames 11, 11 and a front frame (support 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 to the upper end of the skew portion 13b of the front leg 13, and is formed to bend at the upper end of the skew portion 13b and extend rearward. 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 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 includes a pair of left and right side frames 21 a and 21 a extending in the front-rear direction, a rear connection rod 21 b that connects the rear ends of the side frames 21 a and 21 a in the left-right direction, A front connection rod 24 that connects the frames 21a and 21a in the left-right direction in front of the rear connection 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 extends in a lateral direction over a predetermined length (supported portion) 24a, and extends obliquely upward from both ends of the intermediate portion 24a, and the tip portion is welded to the side frame 21a. And a skewed portion 24b joined by brazing or the like.
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 by a plate-like member 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.
Further, a reinforcing rib (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 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 thickness direction of the base plate 41 so as to encourage the region Sr to 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.

Thus, the base plate 41 constituting the seat member 23 includes a front region Sf that is a region in front of the front connecting rod 24 and a rear region Sr that is a region in the rear of the front connecting rod 24. Therefore, the ease of elastic deformation in the direction (vertical direction) orthogonal to the seating surface of the seating member 23 is set to be different.
That is, in the front region Sf in front of the front connecting rod 24, both left and right ends of the base plate 41 are supported by the pair of side frames 21a and 21a. As a result, the base plate 41 is elastically deformed in the vertical direction perpendicular to the seat surface at the middle portion between the side frames 21a and 21a while having sufficient strength at the portions supported by the side frames 21a and 21a. It becomes easy to do.
Further, in the front region Sf, the rib 41L reinforces the load applied to the front end portion 41f of the base plate 41 from the user's thigh, and excessive elastic deformation of the intermediate portion in the left-right direction of the base plate 41 is achieved. Is supposed to suppress.
Further, the rear region Sr behind the front connecting rod 24 is surrounded on all sides by a pair of side frames 21a and 21a, a front connecting rod 24, and a rear connecting rod 21b that constitute the seat frame 21. It is. As a result, the outer peripheral portion of the rear region Sr is less likely to be elastically deformed in a direction perpendicular to the seat surface compared to the front region Sf in front of the front connecting rod 24, and sufficient support strength is obtained, giving a sense of rigidity. It can be brewed. On the other hand, the inner peripheral portion of the rear region Sr is easily bent downward according to the load acting from the user's buttocks when the user is seated.

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.

  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. In other words, the intermediate portion 24 a of the front connecting rod 24 of the seat frame 21 is positioned via the lower cover 22 vertically above the front frame 12 of the leg portion 10.

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, 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 left and right intermediate portion of the front end portion 41f of the base plate 41 is elastically deformed downward by a load acting from the user's thigh, and a feeling of elasticity is obtained. In addition, the rib 41L suppresses the front end portion 41f of the base plate 41 from being elastically deformed excessively downward, so that a sense of rigidity and a feeling of elasticity can be obtained in a balanced manner.
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 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. According to such a configuration, in the front region Sf in front of the front connecting rod 24, the seating surface member 23 has sufficient strength at the portions supported by the side frames 21a and 21a, and the side frame 21a. , 21a are easily elastically deformed in a direction perpendicular to the seating surface. In particular, since the front end portion of the seat member 23 becomes a free end portion, elastic deformation in a direction in which the front end portion bends downward is promoted. Therefore, the thigh of the seated person can be softly supported.
Further, the rear region Sr behind the front connecting rod 24 is less likely to be elastically deformed in the direction perpendicular to the seat surface compared to the front region Sf, and sufficient support strength can be obtained.
Therefore, the chair 1 as described above can improve the seating feeling while sufficiently securing the strength of the seat portion 20.

  In addition, the seat member 23 includes a rib 41L that is continuous in the front-rear direction in front of the front connecting rod 24. Thereby, in the seat surface member 23, it is possible to reinforce the deformation in the direction in which the front end portion of the seat surface member 23 is lowered downward, particularly in the front region Sf in front of the front connecting rod 24. Accordingly, it is possible to suppress an excessive deformation of a portion that is easily deformed in structure.

  Further, the intermediate portion 24 a of the front connecting rod 24 is arranged and supported vertically above the support frame 12 provided on the leg portion 10. As a result, the load is efficiently transmitted from the front connecting rod 24 of the seat frame 21 to the support frame 12 of the leg 10 vertically below, and the support strength of the seat 20 is increased.

  Further, front end portions 21f and 21f of the pair of side frames 21a and 21a constituting the seat frame 21 are fixed to the lower cover 22, respectively. In this way, the front portion of the seat frame 21 and the lower cover 22 are integrated, and the seat member 23 can be reliably supported.

(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 said embodiment, although it was set as the structure which can flip up the seat part 20 upwards, not only this but the seat part 20 may be fixed. Furthermore, in the said embodiment, although it was set as the structure provided with the backrest part 30, the backrest part 30 is not an essential structure.

In addition, the structure of each part of the chair 1 such as the structure of the seat part 20 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.

1 Chair 10 Leg 12 Front frame (support frame)
20 Seat (seat member)
21 Seat frame 21a Side frame 21b Rear connecting rod 21f Front end 21r Rear end 22 Lower cover 23 Seat member 24 Front connecting rod 24a Middle portion (supported portion)
30 Backrest portion 41L Rib Sf Front region (region ahead of front connecting rod)
Sr rear area (area behind the front connecting rod)

Claims (5)

A seat member of a chair that supports a seated person,
A seat frame supported on the legs of the chair;
A seat surface member provided on the seat frame and forming a seat surface;
The seat frame is
A pair of side frames extending in the front-rear direction;
A rear connection rod connecting the rear ends of the side frames;
A front connecting rod that connects the side frames forward of the rear connecting rod and behind the front end of the side frame, and
The seat member is provided to cover the pair of side frames over the entire length from the front end portion to the rear end portion of the pair of side frames.   The seat member according to claim 1, wherein the seat surface member includes a rib continuous in the front-rear direction in front of the front connecting rod.   The said front part coupling rod has the to-be-supported part arrange | positioned and supported in the vertically upper direction of the support frame which is provided in the said leg part and supports the said seat surface member, The Claim 1 or 2 characterized by the above-mentioned. Seat member. A lower cover covering the lower portion of the seat frame;
The seat member according to any one of claims 1 to 3, wherein at least front ends of the pair of side frames are fixed to the lower cover, respectively. The legs,
The seat member according to any one of claims 1 to 4,
A chair provided with a backrest provided at the back of the seat member.