JP4383788B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair that can stably support a rear portion of a seat on a leg frame.
[0002]
[Prior art]
In the chair, a flexible synthetic resin seat plate is connected to the upper part of a pair of left and right main frames in the leg frame and a pair of front and rear cross rails connecting the front and rear surfaces thereof. (See, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-340155
[Problems to be solved by the invention]
In the conventional chair described in Patent Document 1, the substantially flat rear end lower surface of the seat plate is simply placed and supported on the upper surface of the round pipe-shaped horizontal rail. The support area for the rear frame of the plate is extremely small.
[0005]
Therefore, when sitting near the rear part of the seat, a large bending load acts locally on the rear part of the seat plate, the bending deformation of that part becomes large, and the support becomes unstable or the support strength decreases. .
[0006]
Further, when the chairs are stacked and stored with the rear end of the seat plate facing downward, the rear portion of the seat plate may be damaged.
[0007]
The present invention has been made in view of the above problems, and by stably increasing the support area for the leg frame at the rear part of the seat and reducing the bending deformation of that part, the rear part of the seat is stably supported by the leg frame. In addition, an object of the present invention is to provide a chair capable of increasing the support strength and preventing the rear portion of the seat from being damaged even when stacked.
[0008]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) Between the rear ends of a pair of left and right support rods facing in the front-rear direction at the upper part of the leg frame, a seat support member facing in the left-right direction in which an upward support plate is connected to the rear end of the horizontal support plate is provided. The lower surface and the rear surface of the rear end portion of the seat each having an upright piece are brought into contact with and supported by the upper surface of the horizontal support plate and the front surface of the upward support plate in the seat support member.
[0009]
(2) In the above item (1), the seat includes a synthetic resin seat frame, and the rear frame of the seat frame has a substantially L-shaped cross-sectional shape in side view including an inward support piece and an upright piece, In addition, a plurality of ribs facing upward and downward are provided rearward on the rear surface of the standing piece, and the rear ends of the plurality of ribs are brought into contact with the front surface of the seat support member.
[0010]
(3) In the above item (1) or (2), the upward support plate in the seat support member is inclined obliquely rearward and upward.
[0011]
(4) In any one of the above items (1) to (3), the upper end edge of the upward support plate of the seat support member is covered by bending the upper end portion of the standing piece downward.
[0012]
(5) In any one of the above items (1) to (4), the seat support member is integrally formed of a metal plate.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the frame (1) in the chair of the present invention, FIG. 2 is an exploded perspective view of the seat (2), and FIG. 3 is an enlarged side view of the central longitudinal section when the seat (2) is attached.
[0014]
The chair frame (1) faces left and right between the pair of left and right leg frames (3) and (3) made of steel pipe and the front and rear facing surfaces of the horizontal support rod (3a) that faces them. The metal front seat support member (4) and the rear seat support member (5) fixed to each other and the upper end portions of the front leg portions (3b) and (3b) facing the vertical direction of the leg frame (3) are fixed. A backrest (7) is attached between the upper end portions of the rear leg portions (3c) (3c) which are composed of the connecting rods (6) and face the vertical direction of the leg frame (3).
[0015]
The front seat support member (4) has a substantially upward U-shape as viewed from the side, with its central portion curved slightly downward, and through holes (8) are formed at both left and right ends thereof.
[0016]
The rear seat support member (5) has a horizontal support plate (5a) which is curved in an arc shape so that both left and right ends are fixed to the lower surface of the support rods (3a) and (3a) and the central portion bulges backward. And an upward support plate (5b) that rises in an arc shape slightly obliquely upward and rearward from the rear edge, thereby forming a substantially L-shaped cross-section in side view, and the left and right ends of the horizontal support plate (5a). A through hole (8a) is formed in the part, and a notch groove (9) having a U-shape in plan view is formed in the front end edge of the center part.
[0017]
The seat (2) includes a seat frame (10), a seat shell (11), a cushioning material (12) such as foamed polyurethane, and a skin material (13) such as a cloth.
[0018]
The seat frame (10) is integrally formed in a substantially square frame shape with a large opening at the center by a hard synthetic resin, and the left and right side frames (10a) (10a) and the rear frame (10b) are inward support pieces (14 ) And the upward piece (15) form an inward L-shaped cross section.
[0019]
On the upper ends of the upward pieces (15) of the side frames (10a) and the rear frame (10b), outward flange pieces (which can be placed on the upper surfaces of the support rods (3a) of the left and right leg frames (3), respectively) 16) (16), and the upper end is bent in a downward U-shape, and the upper end is slanted enough to cover the front and upper ends of the upward support plate (5b) in the downward rear seat support member (5) An inclined flange piece (17) facing rearward and upward is integrally formed (see FIG. 3).
The inclined flange piece (17) and the upward piece (15) constitute an upright piece.
[0020]
The rear-side inward support piece (14) and the inclined flange piece (17) are curved in a rearward arc shape in substantially the same manner as the rear seat support member (5), and are formed at the left and right ends of the rear-side inward support piece (14). Is formed with a through hole (18) aligned with the through hole (8) when placed on the upper surface of the horizontal support plate (5a) of the rear seat support member (5).
[0021]
As shown in FIG. 4, at the corners of the rear surfaces of the inclined flange piece (17) and the upward piece (15), the upper surface of the horizontal support plate (5a) of the rear seat support member (5) and the upward support plate are provided. A large number of rearward reinforcing ribs (19) that can come into contact with the front surface of (5b) are formed.
[0022]
The front frame (10c) of the seat frame (10) is inclined obliquely forward and downward, and as shown in FIG. 3, is formed in a substantially upward U-shaped cross section when viewed from the side, and the outward flange piece (16) and The continuous front piece (20a) and rear piece (20b) are reinforced by a plurality of ribs (21) joined between their facing surfaces (see FIG. 4).
[0023]
The plurality of ribs (21) and the rear piece (20b) form an inward support portion, and the support frame supports a front frame piece (11b) described later on the seat shell (11). It is like that.
[0024]
A pair of left and right locking pieces (23) and (23) having a horizontal rectangular locking hole (22) project diagonally rearward and upward at an intermediate portion of the rear piece (20b). (See FIG. 8).
[0025]
In addition, a locking protrusion (24) is provided inwardly in the middle of the inward support piece (14) of the left and right side frames (10a).
[0026]
As shown in FIG. 5, the seat shell (11) has a generally rectangular shallow dish shape that is removably fitted into the frame of the seat frame (10), and the whole is integrally formed of synthetic resin. Yes.
[0027]
The vertical dimension of the frame-shaped piece (11a) facing the left and right of the seat shell (11) and above the rear part is the vertical dimension of the upper piece (15) of the side frame (10a) and the rear frame (10b) of the seat frame (10). It is almost the same size as the dimensions.
[0028]
Further, the front end portion of the seat shell (11) is curved in an arc shape obliquely forward and downward, and the front end (20a) and the rear piece of the front frame (10c) of the seat frame (10) are arranged at the front end. A front frame piece (11b) in which the lower surface of the front end is in contact with the upper end of the front piece (20a) between (20a) is connected in a diagonally upward direction (see FIG. 5).
[0029]
The cross-sectional shapes of the front frame piece (11) and the front end of the bottom plate (25) are generally L-shaped in side view.
[0030]
As shown in the bottom perspective views of FIGS. 6 and 7, a part of the upper surface of the bottom plate (25) is placed on the upper side of the seat shell (11) slightly behind the bottom plate (25) curved slightly downward. By forming a U-shaped cross-section with an opening at the bottom, the forward concave strips (26a) (26a) on the left and right sides that are slightly thinner than the thickness of the bottom plate (25), and the rear side A planar U-shaped flexible groove (26) comprising a horizontal groove (26b) is provided.
[0031]
The size of the center portion of the bottom plate (25) surrounded by the flexible recess (26) is slightly larger than the size of the average buttock of the seated person, and there are many small holes ( 27) is drilled to make it easier to bend.
[0032]
As shown in FIGS. 6 and 7, the flexible recess (26) has a flexible recess on the rear side of the forward recess (26a) and on the left and right sides of the lateral recess (26b). A slit (28) is formed to face the direction orthogonal to the strip (26) so as to be discontinuous. As shown in FIG. 5, each of the slits (28) penetrates up to the upper surface of the bottom plate (25), and both ends thereof have an arc shape.
[0033]
As shown in an enlarged view in FIG. 7, by joining the adjacent ends of the flexible recess (26) divided by the slit (28) to both bases on the back side of each slit (28), A rib (29) that reinforces that portion is integrally projected so as to surround the end of the slit (28).
[0034]
The front ends of the left and right forward concave ridges (26a) open to the lower surface of the bottom plate (25), and the slits (28) and (28) facing the left and right are also formed in the bottom plate (25) adjacent to the opening end. In addition, the peripheral edge of the back surface and the left and right opening bases of the forward concave strip (23a) are reinforced by ribs (30).
[0035]
As shown in FIGS. 3 and 6, the lower surface of the front end portion of the bottom plate (25) of the seat shell (11) is fitted and positioned on the front and rear upper ends of the front seat support member (4) from above. A pair of front and rear ridges (31) and (31) are projected in the left-right direction.
[0036]
Mounting bosses (33) having through-holes (32) aligned with the through-holes (8) of the front seat support member (4) at the left and right ends between the protrusions (31) on the lower surface of the bottom plate (25) ) (33) is projected downward.
[0037]
As shown in FIG. 3, a tapping screw (34) inserted from below the front seat support member (4) is screwed into the through holes (32) of both mounting bosses (33), and the seat shell (11) The front end portion lower surface is fixed to the upper surface of the front seat support member (4).
[0038]
Mounting bosses (33) and (33) similar to the above are projected on the left and right sides of the lower surface of the rear end of the bottom plate (25), and the rear seats are formed in the through holes (32) of the mounting boss (33). Tapping screws (34) and (34) (see FIG. 1) inserted from below into the through hole (8) of the support member (5) and the through hole (18) of the inward support piece (11) of the seat frame (10). The seat frame (10) and the seat shell (11) fitted to the seat frame (10) are both fixed to the rear seat support member (5).
[0039]
As shown in FIGS. 5, 6, and 8, the lower surface of the center portion of the front end of the bottom plate (25) in the seat shell (11) is directed diagonally forward and downward and has an upward hook-like engagement claw ( A pair of left and right engaging pieces (35) and (35) having a projection 35a) are provided so that the engaging claws 35a are fitted into the seat frame 10 when the seat shell 11 is fitted to the seat frame 10. The front frame (10c) of the seat frame (10) is elastically engaged with a locking hole (22) formed in the locking piece (23) of the rear piece (20b).
[0040]
As shown in FIGS. 3, 4, and 9, an upward hook-like engagement claw is provided on the free end portion of the bottom plate (25) on the middle lower surface in the front-rear direction of the lower surface of both side portions and the rear lower end portion. An engaging piece (36) having an outward J-shaped cross section is provided so as to protrude downward.
[0041]
The upper ends of the free end sides of the left and right engagement pieces (36) are elastically deformed and pressed inward when the seat shell (11) is fitted to the seat frame (10), thereby the seat frame ( 10) It engages with the lower surface of the locking projection piece (24) projecting from the left and right inward support pieces (14) (see FIG. 9).
[0042]
As shown in FIG. 3, the upper end on the free end side of the engagement piece (36) at the center of the rear end is elastically engaged with the lower surface of the inward support piece (14) on the rear side of the seat frame (10). It has become.
[0043]
To assemble the seat (2), first insert the cushion material (12) into the frame of the seat shell (11) and place it on the surface of the cushion material using the skin material (11) as follows. cover.
[0044]
The peripheral part of the skin material (13) superimposed on the upper surface of the cushion material (12) was slightly folded back to the lower surface side of the seat shell (11), and then inserted into the bag-like edge (13a) of the skin material (13). The tightening string (37) is tightened and tensioned, and the surface of the cushion material (12) and the peripheral end of the seat shell (11) are wrapped and covered.
[0045]
Next, the seat shell (11) is fixed in the frame of the seat frame (10) as follows.
That is, first, the locking claws (35a) of the pair of engaging pieces (35) provided on the lower surface of the front end portion of the bottom plate (25) of the seat shell (11) are attached to the front frame (10c) of the seat frame (10). After engaging the locking holes (22) of the pair of locking pieces (23) provided on the rear piece (20b), the entire seat shell (11) is pressed downward, and both left and right sides of the bottom plate (25) The three engaging pieces (36) provided at the rear and rear end portions are elastically engaged with the lower surface of the locking projection piece (24) of the seat frame (10) and the inward support piece (14) as described above. Let
[0046]
As a result, the seat shell (11) is supported by the inwardly supporting pieces (14) of the seat frame (10) on the left and right sides and the lower side of the bottom plate (25), and the front frame piece (11b). The lower surface of the seat frame 10 is stably fixed in the frame of the seat frame 10 with the upper surface of the front frame 10c of the seat frame 10 in contact.
[0047]
At this time, the left and right sides of the skin material (13) folded back to the lower surface side of the seat shell (11) and the peripheral end portions on the rear side are inward support pieces (14) and upward pieces (15) of the seat frame (10). ) And the frame-shaped piece (11a) of the seat shell (11) and the bottom surface of the bottom plate (25), and the front peripheral edge is the front frame (10c) of the seat frame (10). And the front frame piece (11b) of the seat shell (11), so that the sandwiching area of the entire peripheral edge of the skin material (13) becomes large and it can be easily detached from the seat shell (11). There is no fear (see Figure 3).
[0048]
In order to attach the seat (2) thus assembled to the chair frame (1), the left and right outwards of the seat frame (10) are first placed on the upper surfaces of the support rods (3a) of the left and right leg frames (3). The flange piece (16) is placed, and the inward horizontal piece (14) on the rear side of the seat frame (10) is placed on the upper surface of the horizontal support plate (5a) of the rear seat support member (5). A reinforcing rib (19) is brought into contact with the front surface of the directional support plate (5b), and at the same time, a lower surface of the front end portion of the bottom plate (25) of the seat shell (11) attached to the seat frame (10) is provided thereon. Positioning is performed by the front and rear ridges (31) and (31), and is placed on the upper end of the front seat support member (4).
[0049]
Next, two front and rear tapping screws (34) inserted from below the front and rear seat support members (4) and (5) are screwed toward the mounting boss (33) of the seat shell (11).
[0050]
Thereby, the seat (2) is stably fixed to the upper part of the leg frame (3) so that the seat shell (11) and the cushion material (12) are positioned between the left and right support rods (3a). (See FIG. 3).
[0051]
When the seat (2) is installed, the seat shell (11) is attracted to the seat frame (10) by the front and rear tapping screws (34) and firmly fixed. The peripheral edge of the folded skin material (13) is the inward support piece (14) of the seat frame (10) and the lower surface of the bottom plate (25) of the seat shell (11), and the front frame of the seat frame (10) ( The upper surface of 10c) and the lower surface of the front frame piece (11b) of the seat shell (11) are strongly pinched.
[0052]
Therefore, even if the skin material (13) is pulled strongly in the front-rear and left-right directions, there is no fear that the peripheral end of the skin material will be detached from or displaced from the seat shell (11).
[0053]
When seated on the seat (2) after installation, as shown in FIG. 10 (the cushion material and the skin material are not shown), the central portion of the bottom plate (25) of the seat shell (11) is formed with a flexible groove (26 ) Around the opening of the seat frame (10).
[0054]
That is, when the load of the seated person's buttocks is applied to the central portion of the bottom plate (25) surrounded by the flexible recess (26), the thin flexible recess (26) becomes 2 in FIG. By elastically deforming in the expanding direction as indicated by a dotted line, the center portion of the bottom plate (25) is bent in an arc shape so as to sink downward.
[0055]
Moreover, since the flexible recess (26) has a plurality of slits (28) and is discontinuous, its flexural rigidity is reduced, and the flexibility of the central portion of the bottom plate (25) is large. As a result, sitting comfort is improved.
[0056]
Since the base of the slit (28) is reinforced by the rib (30), even if the central portion of the bottom plate (25) is repeatedly greatly bent, the base plate (25) is cracked from the base of the slit (28). There is no fear of generating.
[0057]
Since a large number of small holes (27) are formed in the central portion of the bottom plate (25), the portions can be easily bent along the collar portion, and the sitting comfort is further improved.
[0058]
Between the rear ends of the horizontal rods (3a) in the left and right leg frames (3), a substantially L-shaped cross-section in side view consisting of a horizontal support plate (5a) and an upward support plate (5a) that stands up rearward and upward The rear seat support member (5) with high rigidity is provided on the lower surface and the front surface thereof, and on the rear surface of the upward frame (15) and the inclined flange piece (17) of the rear frame (10b) of the seat frame (10). Since the rear end and the lower surface of the large number of reinforcing ribs (19) are in contact with each other, the rear frame (10b) of the seat frame (10), that is, the seat frame (10), the seat shell (11), the cushion material ( 12) and the support area of the rear end of the seat (2) made of the skin material (13) is increased, the load at the time of sitting is dispersed, and the surface pressure is reduced.
[0059]
As a result, the bending deformation of the rear portion of the seat frame (10) is reduced, the rear portion of the seat (2) is stably supported, and the support strength is also increased.
[0060]
Further, since the lower surface and the rear surface of the rear frame (10b) are covered with the metal rear seat support member (5), a large number of chairs having the same shape are stacked with the rear seat support member (5) facing downward. When storing and storing, the lower surface and the rear surface of the rear frame (10b) are protected and are prevented from being scratched.
[0061]
Moreover, even if a large number of stacked chair loads act as an upward reaction force on the rear seat support member (5) of the lowermost chair and the inclined flange piece (17) of the seat frame (10), a large number of reinforcements are provided. Since the ribs (19) are provided, there is no possibility that problems such as breakage due to large bending of the ribs will occur.
[0062]
In the above embodiment, the seat shell (11) has the frame-shaped piece (11a) .However, when the seat shell (11) is relatively thick and has a large flexural rigidity, the frame-shaped piece (11a) ) May be omitted to form a flat plate, or the left and right sides or the rear part may be omitted.
[0063]
Three engagement pieces (36) on the lower surface of the seat shell (11) are connected to the lower surface of the engagement piece (24) of the inward support piece (14) in the seat frame (10) and the inward support piece (14). Although it is elastically engaged with the lower surface of the inner peripheral edge, an engagement hole is formed in the inward support piece (14), and each engagement piece (36) is elastically engaged with this engagement hole. Good.
The present invention can also be applied to a chair having a seat in which the seat frame (10) is omitted.
[0064]
【The invention's effect】
According to the first aspect of the present invention, when a seated person's load is applied to the upright piece of the rear end portion of the seat toward the rear lower side, the lower surface and the rear surface of the rear end portion of the seat are the seat support member. Therefore, the bending deformation of the rear end portion of the seat is reduced, the rear portion of the seat can be stably supported by the leg frame, and the support strength is increased.
[0065]
In addition, since the rear part of the seat is covered by the seat support member, when a plurality of chairs having the same shape are stacked, the rear surface and the lower surface of the rear end part of the seat are protected, and the parts are prevented from being damaged. The
[0066]
According to the second aspect of the present invention, even if the seat is provided with a synthetic resin seat frame, the upright pieces of the rear frame then contact the upper surface and the front surface of the seat support member via the plurality of ribs. Since they are in contact with each other, the bending deformation of the rear end portion of the seat frame is small, and the support strength is also large.
Further, the rear end portion of the synthetic resin seat frame is prevented from being damaged.
[0067]
According to the third aspect of the present invention, the load applied to the rear part of the seat from right above is supported a little by the upward support plate of the seat support member, so that the support strength of the rear end part of the seat becomes larger. .
[0068]
According to the fourth aspect of the present invention, the upper end edge of the upward support plate of the seat support member is not exposed, so that the appearance is improved.
[0069]
According to the invention of claim 5, since the strength and rigidity of the seat support member are increased, the support strength of the rear end portion of the seat can be further increased.
Moreover, when the chairs are stacked, the seat support member is not bent.
[Brief description of the drawings]
FIG. 1 is a perspective view of a chair frame of the present invention.
FIG. 2 is an exploded perspective view of the seat.
FIG. 3 is an enlarged side view of a longitudinal section of a seat portion in the same manner.
FIG. 4 is a rear perspective view of the seat frame.
FIG. 5 is also a plan view of a seat shown with a cushion material removed.
FIG. 6 is a perspective view of the lower surface of the seat shell.
7 is an enlarged view of a part A in FIG. 6;
FIG. 8 is an enlarged longitudinal sectional side view taken along line VIII-VIII in FIG. 5;
9 is an enlarged longitudinal sectional view taken along line IX-IX in FIG.
10 is an enlarged vertical sectional view taken along line XX of FIG.
[Explanation of symbols]
(1) Frame
(2) Seat
(3) Leg frame
(3a) Support rod
(3b) Front leg
(3c) Rear leg
(4) Front seat support member
(5) Rear seat support member
(5a) Horizontal support plate
(5b) Upward support plate
(6) Linkage
(7) Backrest
(8) Through hole
(9) Notch groove
(10) Seat frame
(10a) Side frame
(10b) Rear frame
(10c) Front frame
(11) seat shell
(11a) Frame-shaped piece
(11b) Front frame piece
(12) Cushion material
(13) Skin material
(13a) Bag edge
(14) Inward support piece
(15) Upward piece (standing piece)
(16) Outward flange piece
(17) Inclined flange piece (standing piece)
(18) Through hole
(19) Reinforcement rib
(20a) Front piece
(20b) Rear piece
(21) Rib
(22) Locking hole
(23) Locking piece
(24) Locking protrusion
(25) Bottom plate
(26) Flexible recess
(26a) Forward concave strip
(26b) Horizontal groove
(27) Small hole
(28) Slit
(29) (30) Rib
(31) Projections
(32) Through hole
(33) Mounting boss
(34) Tapping screw
(35) Engagement piece
(35a) Engaging claw
(36) Engagement piece
(37) Fastening string

Claims (5)

Between the rear ends of the pair of left and right support rods facing in the front-rear direction at the upper part of the leg frame, a seat support member facing in the left-right direction is provided with an upward support plate connected to the rear end of the horizontal support plate. A chair, characterized in that a rear end lower surface and a rear surface of a seat each having an upright piece at the rear end are in contact with and supported by the upper surface of the horizontal support plate and the front surface of the upward support plate in the support member. The seat includes a synthetic resin seat frame, and the rear frame of the seat frame has a substantially L-shaped cross-sectional shape in a side view including an inward support piece and an upright piece. The chair according to claim 1, wherein a plurality of facing ribs are protruded rearward, and the rear ends of the plurality of ribs are brought into contact with the front surface of the seat support member. The chair according to claim 1 or 2, wherein an upward support plate in the seat support member is inclined obliquely rearward and upward. The chair according to any one of claims 1 to 3, wherein the upper end edge of the upward support plate of the seat support member is covered by bending the upper end portion of the upright piece downward. The chair according to any one of claims 1 to 4, wherein the seat support member is integrally formed of a metal plate.

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