U.S. patent application number 14/917919 was filed with the patent office on 2016-08-04 for chair.
The applicant listed for this patent is OKAMURA CORPORATION. Invention is credited to Hiroshi MASUNAGA, Yuuichirou TAKAGI.
Application Number | 20160220036 14/917919 |
Document ID | / |
Family ID | 52665535 |
Filed Date | 2016-08-04 |
United States Patent
Application |
20160220036 |
Kind Code |
A1 |
MASUNAGA; Hiroshi ; et
al. |
August 4, 2016 |
CHAIR
Abstract
A load-supporting body includes a base plate constituting a
framework; a cushion material arranged on a front surface side of
the base plate; an upholstery material stretched to cover an
outside surface of the cushion material and an outer peripheral
edge of the base plate; and a tightening cord inserted through a
peripheral edge of the upholstery material and tightened to allow
end parts to be tied together on a rear surface side of the base
plate in a state in which the upholstery material has covered the
outside surface of the cushion material and the outer peripheral
edge of the base plate. The base plate is provided with a first
side wall and a first protruding wall that restricts displacement
of the tightening cord in a base-plate center direction, and a
second side wall and a second protruding wall that restrict
displacement of the tightening cord in a base plate outward
direction. This provides a chair that can appropriately restrict
the displacement of the tightening cord and a peripheral edge of
the upholstery material and can reduce positional deviation of the
upholstery material.
Inventors: |
MASUNAGA; Hiroshi;
(Yokohama-shi, JP) ; TAKAGI; Yuuichirou;
(Yokohama-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
OKAMURA CORPORATION |
Kanagawa |
|
JP |
|
|
Family ID: |
52665535 |
Appl. No.: |
14/917919 |
Filed: |
August 25, 2014 |
PCT Filed: |
August 25, 2014 |
PCT NO: |
PCT/JP2014/072117 |
371 Date: |
March 9, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B68G 7/12 20130101; A47C
1/022 20130101; A47C 31/023 20130101; A47C 7/24 20130101 |
International
Class: |
A47C 31/02 20060101
A47C031/02; A47C 7/02 20060101 A47C007/02; A47C 7/24 20060101
A47C007/24 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 13, 2013 |
JP |
2013-190952 |
Claims
1. A chair, comprising a load-supporting body, the load-supporting
body including: a base plate constituting a framework; a cushion
material arranged on a front surface side of the base plate; an
upholstery material stretched to cover at least an outside surface
of the cushion material and an outer peripheral edge of the base
plate; and a tightening cord inserted through a peripheral edge of
the upholstery material and tightened to allow end parts to be tied
together on a rear surface side of the base plate in a state in
which the upholstery material has covered the outside surface of
the cushion material and the outer peripheral edge of the base
plate, wherein the base plate is provided with first locking means
for restricting displacement of the tightened tightening cord in a
base-plate center direction, and second locking means for
restricting displacement of the tightened tightening cord in a base
plate outward direction.
2. The chair according to claim 1, wherein the base plate is formed
in a substantially rectangular shape having corner parts at four
corners and linear parts between the corner parts, wherein the
corner parts are provided with the first locking means, and wherein
at least some of the linear parts are provided with the second
locking means.
3. The chair according to claim 1, wherein the first locking means
includes a first side wall protruding from a rear surface of the
base plate to a rear side, and a first protruding wall protruding
in an outward direction of the base plate from the vicinity of a
protruding end of the first side wall, and wherein the second
locking means includes a second side wall protruding from the rear
surface of the base plate to the rear side, and a second protruding
wall protruding in an inward direction of the base plate from the
vicinity of a protruding end of the second side wall.
4. The chair according to claim 3, wherein a recessed groove that
is continuous in a circumferential direction of the base plate is
formed in the rear surface of the base plate, the first side wall
is an inside wall of the recessed groove, and the second side wall
is an outside wall of the recessed groove.
5. The chair according to claim 3, wherein the first protruding
wall and the second protruding wall are arranged so as to be
separated from each other in a direction in which the tightening
cord extends, and to be adjacent to each other.
6. The chair according to claim 5, wherein respective tip parts of
the first protruding wall and the second protruding wall that are
provided adjacent to each other extend to positions with
substantially half lengths of the separation width of the first
side wall and the second side wall in a direction intersecting the
direction in which the tightening cord extends.
7. The chair according to claim 3, wherein tip parts of the first
protruding wall and the second protruding wall are arranged at
positions that face each other.
8. The chair according to claim 3, wherein portions of tip parts of
the first protruding wall and the second protruding wall are
arranged to face each other, and remaining portions thereof are
arranged so as to be separated from each other in a direction in
which the tightening cord extends.
9. The chair according to claim 2, wherein the first locking means
includes a first side wall protruding from a rear surface of the
base plate to a rear side, and a first protruding wall protruding
in an outward direction of the base plate from the vicinity of a
protruding end of the first side wall, and wherein the second
locking means includes a second side wall protruding from the rear
surface of the base plate to the rear side, and a second protruding
wall protruding in an inward direction of the base plate from the
vicinity of a protruding end of the second side wall.
10. The chair according to claim 9, wherein a recessed groove that
is continuous in a circumferential direction of the base plate is
formed in the rear surface of the base plate, the first side wall
is an inside wall of the recessed groove, and the second side wall
is an outside wall of the recessed groove.
11. The chair according to claim 9, wherein the first protruding
wall and the second protruding wall are arranged so as to be
separated from each other in a direction in which the tightening
cord extends, and to be adjacent to each other.
12. The chair according to claim 11, wherein respective tip parts
of the first protruding wall and the second protruding wall that
are provided adjacent to each other extend to positions with
substantially half lengths of the separation width of the first
side wall and the second side wall in a direction intersecting the
direction in which the tightening cord extends.
13. The chair according to claim 9, wherein tip parts of the first
protruding wall and the second protruding wall are arranged at
positions that face each other.
14. The chair according to claim 9, wherein portions of tip parts
of the first protruding wall and the second protruding wall are
arranged to face each other, and remaining portions thereof are
arranged so as to be separated from each other in a direction in
which the tightening cord extends.
Description
TECHNICAL FIELD
[0001] The present invention relates to a chair in which an
attachment part of an upholstery material of a load-supporting
body, such as a seat body or a backrest, is improved.
[0002] Priority is claimed on Japanese Patent Application No.
2013-190952, filed Sep. 13, 2013, the content of which is
incorporated herein by reference.
BACKGROUND ART
[0003] In seat bodies of chairs used for office work, generally, a
cushion material, such as urethane, is arranged at an upper part of
a base plate constituting a framework, and is covered with a
sheet-like upholstery material from an outside surface of the
cushion material to an outside edge of the base plate.
[0004] When the upholstery material of this type of chair is
attached, it is easy to replace the upholstery material with
another at the time of fouling or the like, and it is easy to apply
stable tension throughout the upholstery material. Therefore, a
technique of narrowing a peripheral edge of the upholstery material
on a lower surface side of the base plate using a tightening cord,
thereby fixing the upholstery material to the cushion material and
the base plate is frequently used (for example, refer to Patent
Documents 1 and 2).
[0005] In the chair described in Patent Documents 1 and 2, a
bag-shaped insertion hole is provided in the peripheral edge of the
upholstery material that holds the outside surface of the cushion
material, and the outer peripheral edge of a base plate, the
tightening cord is inserted through the insertion hole, and end
parts of the tightening cord are tied together on the lower surface
side of the base plate. A locking projection that restricts the
displacement of the tightening cord to a base plate center side is
provided on a lower surface side of such a chair, and thereby,
positional deviation of the upholstery material is prevented.
[0006] In such a chair, the upholstery material can be easily
attached to the cushion material and the base plate by tightening
the tightening cord in the shape of a loop on the lower surface
side of the base plate and tying the end parts. Moreover,
variations in the tension that acts on the upholstery material can
be reduced by managing the length of the tied part of the
tightening cord.
CITATION LIST
Patent Document
[0007] [Patent Document 1] Japanese Patent Publication No.
3728576
[0008] [Patent Document 2] Japanese Patent Publication No.
4255670
SUMMARY OF INVENTION
Technical Problem
[0009] In the chair described in Patent Documents 1 and 2, the
locking projection is formed only in a direction in which the
tightening cord that tends to narrow inward is caught. However,
actually, if the upholstery material is stretched on the cushion
material and the base plate, it becomes clear that the peripheral
edge of the upholstery material tightened by the tightening cord is
displaced not only in a direction in which the peripheral edge
tends to narrow inward but also in a direction in which the
peripheral edge tends to widen outward.
[0010] As the cause of this, for example, if the peripheral edge of
the upholstery material is tightened by the tightening cord in a
case where the base plate and the cushion material have a
substantially rectangular shape in plan view, parts corresponding
to vicinities of corner parts of the base plate or the cushion
material on the peripheral edge of the upholstery material are most
strongly pulled by the tightening cord. However, by the parts
corresponding to vicinities of linear parts between the corner
parts adjacent to each other on the peripheral edge of the
upholstery material, pulling force becomes relatively weak.
Therefore, it is predicted that the parts are displaced to
partially widen outward due to the tension of the upholstery
material.
[0011] Thus, an object of the invention is to provide a chair that
can appropriately restrict displacement of a tightening cord and a
peripheral edge of an upholstery material and can reduce positional
deviation of an upholstery material.
Solution to Problem
[0012] In order to solve the above problems, a chair related to the
invention includes a load-supporting body. The load-supporting body
includes a base plate constituting a framework; a cushion material
arranged on a front surface side of the base plate; an upholstery
material stretched to cover at least an outside surface of the
cushion material and an outer peripheral edge of the base plate;
and a tightening cord inserted through a peripheral edge of the
upholstery material and tightened to allow end parts to be tied
together on a rear surface side of the base plate in a state in
which the upholstery material has covered the outside surface of
the cushion material and the outer peripheral edge of the base
plate. The base plate is provided with first locking means for
restricting displacement of the tightened tightening cord in a
base-plate center direction, and second locking means for
restricting displacement of the tightened tightening cord in a base
plate outward direction.
[0013] Accordingly, if the tightening cord inserted through the
peripheral edge of the upholstery material is tightened on the rear
surface side of the base plate in a state in which the upholstery
material has covered the outside surface of the cushion material
and the outer peripheral edge of the base plate, the displacement
of the tightening cord in the base-plate center direction is
restricted by the first locking means, and the displacement of the
tightening cord in the base plate outward direction is restricted
by the second locking means. Therefore, not only the displacement
of the peripheral edge of the upholstery material that tends to
narrow inward but also the displacement thereof that tends to widen
outward is restricted.
[0014] The base plate may be formed in a substantially rectangular
shape having corner parts at four corners and linear parts between
the corner parts, the corner parts may be provided with the first
locking means, and at least some of the linear parts may be
provided with the second locking means.
[0015] In this case, if the tightening cord inserted through the
peripheral edge of the upholstery material is tightened on the rear
surface side of the base plate in a state in which the upholstery
material has covered the outside surface of the cushion material
and the outer peripheral edge of the base plate, the tightening
cord tends to be displaced in the direction of narrowing inward in
the corner parts of the base plate, and the upholstery material
tends to be displaced in the direction of widening outward in some
of the linear parts of the base plate. In this case, each
displacement of the tightening cord is restricted by the first
locking means and the second locking means. Therefore, in every
part of the base plate, curling of the upholstery material can be
appropriately prevented.
[0016] The first locking means may include a first side wall
protruding from a rear surface of the base plate to a rear side,
and a first protruding wall protruding in an outward direction of
the base plate from the vicinity of a protruding end of the first
side wall, and the second locking means may include a second side
wall protruding from the rear surface of the base plate to the rear
side, and a second protruding wall protruding in an inward
direction of the base plate from the vicinity of a protruding end
of the second side wall.
[0017] In this case, slip-out of the tightening cord or the
peripheral edge of the upholstery material is reliably restricted
by the first protruding wall and the second protruding wall.
Additionally, even in a case where the tightening cord or the
peripheral edge of the upholstery material directly abuts against
neither the first protruding wall nor the second protruding wall,
the displacement of the tightening cord or the upholstery material
is restricted by the first side wall or the second side wall.
[0018] A recessed groove that is continuous in a circumferential
direction of the base plate may be formed in the rear surface of
the base plate, the first side wall may be an inside wall of the
recessed groove, and the second side wall may be an outside wall of
the recessed groove.
[0019] In this case, when the upholstery material is attached, the
tightening cord or the peripheral edge of the upholstery material
can be arranged inside the first protruding wall or the second
protruding wall, pushing the tightening cord or the peripheral edge
of the upholstery material into the recessed groove that is
continuous in the peripheral direction of the base plate.
Therefore, the upholstery material can be easily attached.
Additionally, since the tightening cord or the peripheral edge of
the upholstery material is arranged within the recessed groove that
is continuous in the circumferential direction of the base plate,
the upholstery material is not more easily curled.
[0020] It is desirable that the first protruding wall and the
second protruding wall be arranged so as to be separated from each
other in a direction in which the tightening cord extends, and to
be adjacent to each other.
[0021] In this case, even if the length of the first protruding
wall and the second protruding wall is extended, the tip parts of
the first protruding wall and the second protruding wall are
stopped from coming into contact with each other. For this reason,
the length of the first protruding wall and the second protruding
wall can be sufficiently extended, and when the tightening cord or
the peripheral edge of the upholstery material is attached, the
first protruding wall and the second protruding wall can be easily
bent and deformed. Therefore, this can facilitate the attachment of
the upholstery material.
[0022] It is preferable that respective tip parts of the first
protruding wall and the second protruding wall that are provided
adjacent to each other extend to positions with substantially half
lengths of the separation width of the first side wall and the
second side wall in a direction intersecting the direction in which
the tightening cord extends.
[0023] In this case, since the wide range, in a slip-out direction,
of a region where the peripheral edge of the upholstery material
and the tightening cord are arranged is covered with the first
protruding wall and the second protruding wall, slip-out of the
peripheral edge of the upholstery material can be effectively
prevented. Additionally, the work of putting the upholstery
material between the first side wall and the second side wall is
not easily hindered by the first protruding wall and the second
protruding wall.
[0024] Tip parts of the first protruding wall and the second
protruding wall may be arranged at positions that face each
other.
[0025] In this case, since the tip parts of the first protruding
wall and the second protruding wall are arranged to face each
other, even if the displacement direction of the tightening cord or
the peripheral edge of the upholstery material varies, the
displacement of the tightening cord or the peripheral edge of the
upholstery material is reliably restricted by any one of the first
protruding wall and the second protruding wall.
[0026] Portions of tip parts of the first protruding wall and the
second protruding wall may be arranged to face each other, and
remaining portions thereof may be arranged so as to be separated
from each other in a direction in which the tightening cord
extends.
[0027] In this case, even if the displacement direction of the
tightening cord or the peripheral edge of the upholstery material
varies, the displacement of the tightening cord or the peripheral
edge of the upholstery material is reliably restricted by any one
of the first protruding wall and the second protruding wall.
Additionally, since only the portions of the tip parts of the first
protruding wall and the second protruding wall face each other, and
the remaining portions thereof are separated from each other in the
direction in which the tightening cord extends, the first
protruding wall and the second protruding wall extend to be long
along the direction in which the tightening cord extends. For this
reason, the first protruding wall and the second protruding wall
can be easily bent and deformed when the tightening cord or the
peripheral edge of the upholstery material is attached. Therefore,
this can facilitate the attachment of the upholstery material.
Advantageous Effects of Invention
[0028] According to the invention, since not only the displacement
of the peripheral edge of the upholstery material that tends to
narrow inward but also the displacement thereof that tends to widen
outward can be appropriately restricted, positional deviation of
the upholstery material can be more reliably suppressed.
BRIEF DESCRIPTION OF DRAWINGS
[0029] FIG. 1 is a side view of a chair of a first embodiment of
the invention.
[0030] FIG. 2 is a perspective view in a state in which a leg part
of the chair of the first embodiment of the invention is
removed.
[0031] FIG. 3 is a bottom view of a base plate of the first
embodiment of the invention.
[0032] FIG. 4 is a perspective view when the base plate of the
first embodiment of the invention is seen from a lower, diagonally
front and left side.
[0033] FIG. 5 is an enlarged view of a V portion, in FIG. 3, of a
seat body of the first embodiment of the invention.
[0034] FIG. 6 is a sectional view, corresponding to section VI-VI
of FIG. 3, of the seat body of the first embodiment of the
invention.
[0035] FIG. 7 is a sectional view, corresponding to section VII-VII
of FIG. 3, of the seat body of the first embodiment of the
invention.
[0036] FIG. 8 is a bottom view of main parts of a base plate of a
second embodiment of the invention.
[0037] FIG. 9 is a bottom view of main parts of a base plate of a
third embodiment of the invention.
[0038] FIG. 10 is a bottom view of main parts of a base plate of a
fourth embodiment of the invention.
DESCRIPTION OF EMBODIMENTS
[0039] Hereinafter, embodiments of the invention will be described
with reference to the drawings. In addition, in the following
description, a direction in which the front of a human being who
sits down in a regular posture on a chair faces and which is
indicated by arrow FR in the drawings is referred to as "front",
and a direction opposite to the front is referred to as "rear".
Additionally, as for "up", "down", "left", and "right", a direction
indicated by arrow UP in the drawings on the upper side of the
human being who sits down in the regular posture on the chair is
referred to as "up", and a direction opposite thereto is referred
to as "down", and a direction indicated by arrow LH in the drawings
on the left of the human being who sits down in the regular posture
on the chair 1 is referred to as "left", and a direction opposite
thereto is referred to as "right".
[0040] First, a first embodiment illustrated in FIGS. 1 to 7 will
be described.
[0041] FIG. 1 is a side view illustrating the overall configuration
of the chair 1 of this embodiment, and FIG. 2 is a perspective view
when the chair 1 from which some components are removed is seen
obliquely from below.
[0042] As illustrated in these drawings, the chair 1 of this
embodiment includes a leg part 2 placed on a floor F, a box-like
supporting base 3 installed at an upper end of the leg part 2, a
seat body 4 on which a sitting person sits down, a seat-receiving
member 5 attached to an upper surface of the supporting base 3 to
support the seat body 4, and a backrest part 6 that extends to a
rear part upper side from the supporting base 3 and supports the
back of a sitting person who sits down on the seat body 4.
[0043] The leg part 2 includes a multi-branch leg 7 with casters
7a, and a leg pillar 8 that is erected from a central part of the
multi-branch leg 7 and incorporates a gas spring that is a lifting
mechanism, and the supporting base 3 is attached to an upper end
part of the leg pillar 8 so as to be rotatable in a horizontal
direction. A lift-adjusting mechanism of the leg pillar 8 and a
tilt-adjusting mechanism of the backrest part 6 are incorporated
into the supporting base 3. The backrest part 6 includes a
backrest-supporting frame 9 having a substantially L-shape in a
side view, and a backrest body 10 that is attached to a front
surface of a rear upper part of the backrest-supporting frame 9 and
directly supports the back of a sitting person who sits down on the
seat body 4, and a front lower end of the backrest-supporting frame
9 is coupled to the tilt-adjusting mechanism within the supporting
base 3.
[0044] In addition, reference signs 11 in FIGS. 1 and 2 designate a
pivotal shaft of the backrest-supporting frame 9 on the supporting
base 3, and reference sign 12 designates an operation knob of the
tilt-adjusting mechanism provided to protrude from a side surface
of the supporting base 3. Additionally reference sign 90 in FIG. 1
designates armrests attached to lower surfaces on both left and
right sides of the seat body 4 as additional parts.
[0045] FIG. 3 is a bottom view of the seat body 4. In this
embodiment, the seat body 4 constitutes a load-supporting body of
the chair 1 of this embodiment.
[0046] The seat body 4 includes a base plate 13 constituting a
framework, a cushion material 14 made of urethane attached to an
upper part of the base plate 13, and an upholstery material 15 that
is stretched to cover an outside surface of the cushion material 14
to an outer peripheral edge of the base plate 13. In addition, in
FIG. 3, the upholstery material 15 is illustrated by phantom lines
for the sake of illustration.
[0047] FIG. 4 is a perspective view when the base plate 13 is seen
obliquely from below.
[0048] The base plate 13 is formed of synthetic resin having
elasticity, and is formed in a substantially oblong shape with four
rounded corners in a top view. That is, the base plate 13 is
provided with corner parts 13a that are rounded at four corners,
and has an external shape in which linear parts 13b are
respectively arranged between the corner parts 13a adjacent to each
other. The base plate 13 is provided such that a continuous
shielding wall 16 serving as a reinforcing rib protrudes downward
from a lower surface of a peripheral edge excluding a central
region of a rear side. The shielding wall 16 conceals that a lower
surface of the base plate 13 is seen from a side, and functions to
restrict excessive bending deformation of the whole region of the
base plate 13. Additionally a plurality of reinforcing ribs 23 with
low protruding height extending in a forward-rearward direction are
provided at equal intervals so as to protrude from a region closer
to an inner side than the shielding wall 16 of the lower surface of
the base plate 13.
[0049] The base plate 13 is held by the seat-receiving member 5
fixed on the supporting base 3 so as to be slidable forward and
backward.
[0050] As illustrated in FIG. 2, a locking lever 21 for locking the
front and rear positions of the seat body 4 is tiltably attached to
a left side part of the base plate 13. A plurality of lock holes 35
are formed in the seat-receiving member 5, and the sliding position
of the base plate 13 is locked by a tip part of the locking lever
21 being fitted into an arbitrary lock hole 35. A release operation
knob 22 to be gripped by an operator is integrally formed on a base
end side in the locking lever 21.
[0051] FIG. 5 is an enlarged view illustrating a V portion of FIG.
3, and FIGS. 6 and 7 are views illustrating sections corresponding
to a VI-VI section and a VII-VII section of FIG. 3.
[0052] A bag-shaped insertion hole part 17 running along a
circumferential direction is provided at a peripheral edge 15a of
the upholstery material 15 that is arranged so as to be routed to a
lower surface side of the peripheral edge of the base plate 13. The
insertion hole part 17 is broken at a portion of the peripheral
edge 15a of the upholstery material 15 in the circumferential
direction, and a tightening cord 18 is inserted from the broken
portion of the tightening cord 18. The tightening cord 18 tightens
the peripheral edge 15a of the upholstery material 15 on the lower
surface side of the base plate 13, in a state in which the
upholstery material 15 is stretched to hold the outside surface of
the cushion material 14 to the outer peripheral edge of the base
plate 13, and both end parts 18a and 18a are tied together with a
predetermined tension in that state.
[0053] Here, a recessed groove 19 running along the circumferential
direction is formed in the lower surface of the outer peripheral
edge of the base plate 13, and the peripheral edge 15a of the
upholstery material 15 is fitted into the recessed groove 19
together with the tightening cord 18.
[0054] The recessed groove 19 is formed by a first annular side
wall 24 that protrudes downward from the lower surface of the base
plate 13, and a second annular side wall 25 that protrudes downward
from the lower surface of the base plate 13 at a position separated
to the outside of the first side wall 24. In this embodiment, a
portion of the first side wall 24 is formed continuously with a
root side of the shielding wall 16. In other words, the shielding
wall 16 is formed continuously with a protruding end of the first
side wall 24.
[0055] A plurality of first protruding walls 26 that protrude in an
outward direction of the base plate 13 from the vicinity of the
protruding end of the first side wall 24 are provided in regions
corresponding to the respective corner parts 13a of the base plate
13 of the first side wall 24, and regions corresponding to the
linear parts 13b. Meanwhile, a plurality of second protruding walls
27 that protrude in an inward direction of the base plate 13 from
the vicinity of a protruding end of the second side wall 25 are
provided in regions corresponding to the linear parts 13b on both
left and right sides of the base plate 13 and the linear part 13b
on the front side thereof, in the second side wall 25.
[0056] In this embodiment, the first side wall 24 and the first
protruding wall 26 constitute first locking means for restricting
the displacement of the tightened tightening cord 18 in a
base-plate center direction, and the second side wall 25 and the
second protruding wall 27 constitute second locking means for
restricting the displacement of the tightened tightening cord 18 in
the outward direction of the base plate.
[0057] The first protruding wall 26 and the second protruding wall
27 provided in the regions corresponding to the linear parts 13b on
both left and right sides and the linear part 13b on the front side
are arranged so as to be separated from each other by a
predetermined distance in a direction in which (the tightening cord
18 of) the recessed groove 19 extends, and to be adjacent to each
other. That is, the first protruding wall 26 and the second
protruding wall 27 are alternately arranged with the recessed
groove 19 interposed therebetween.
[0058] Regarding the first protruding wall 26 and the second
protruding wall 27 that are provided to be adjacent to each other
in the regions corresponding to the linear parts 13b on both left
and right sides and the linear part 13b on the front side, as
illustrated in FIG. 5, their respective tip parts extend to
positions with substantially half lengths of the groove width of
the recessed groove 19.
[0059] In the chair 1 of this embodiment, in a case where the
cushion material 14 is arranged on the base plate 13 and the
upholstery material 15 is attached thereto, first, the upholstery
material 15 is covered to hold the outside surface of the cushion
material 14 and the outer peripheral edge of the base plate 13, and
the peripheral edge 15a of the upholstery material 15 is fitted
into the recessed groove 19 of the base plate 13 together with the
tightening cord 18 on the lower surface side of the base plate 13.
In this case, in the respective corner parts 13a and the linear
part 13b on a rear side, the tightening cord 18 and the peripheral
edge 15a of the upholstery material 15 ride over only the first
protruding wall 26 and are pushed into the recessed groove 19.
Meanwhile, in the linear parts 13b on both left and right sides and
the linear part 13b on the front side, the first protruding wall 26
and the second protruding wall 27 ride over the tightening cord 18
and the peripheral edge 15a of the upholstery material 15 and are
pushed into the recessed groove 19.
[0060] Next, in this state, both end parts of the tightening cord
18 pulled out from the insertion hole part 17 of the peripheral
edge of the upholstery material 15 are tightened using an
appropriate instrument, and both the end parts of the tightening
cord 18 are tied together in that state. In addition, the
tightening of the tightening cord 18 can also be manually performed
by a worker. In this way, if both the end parts of the tightening
cord 18 are tightened, the tightening cord 18 and the peripheral
edge 15a of the upholstery material 15 tend to be displaced in a
base-material center direction in the regions corresponding to the
respective corner parts 13a of the base plate 13 and the rear
linear part 13b, and the tightening cord 18 and the peripheral edge
15a of the upholstery material 15 tend to be displaced in a base
material outward direction in some of the regions corresponding to
the linear parts 13b on both the left and right sides of the base
plate 13 and the linear part 13b on the front side, and tend to be
displaced in the base-material center direction in some of the
other above regions. In this case, the displacement, in the
base-plate center direction, of the tightening cord 18 and the
peripheral edge 15a of the upholstery material 15 is restricted by
the first side wall 24 and the first protruding wall 26, and the
displacement, in the base plate outward direction, of the
tightening cord 18 and the peripheral edge 15a of the upholstery
material 15 is restricted by the second side wall 25 and the second
protruding wall 27.
[0061] As described above, in the chair 1 related to this
embodiment, the second side wall 25 and the second protruding wall
27 that are the second locking means in addition to the first side
wall 24 and the first protruding wall 26 that are the first locking
means are provided at suitable positions on the lower surface of
the base plate 13 of the seat body 4. Therefore, not only the
displacement of the peripheral edge 15a of the upholstery material
15 that tends to narrow inward but also the displacement thereof
that tends to widen outward can be appropriately restricted. For
this reason, curling of the upholstery material 15 in various
directions can be more reliably suppressed.
[0062] Particularly, in the chair 1 related to this embodiment, the
second side wall 25 and the second protruding wall 27 are provided
in the linear parts 13b on both the left and right sides of the
base plate 13 and the linear part 13b on the front side in the
thick cushion material 14 superimposed on an upper surface.
Therefore, the displacement of the peripheral edge 15a of the
upholstery material 15 that tends to widen outward accompanying the
tightening of the tightening cord 18 can be appropriately
restricted.
[0063] Additionally, in the chair 1 related to this embodiment, the
first locking means is constituted of the first side wall 24 and
the first protruding wall 26, and the second locking means is
constituted of the second side wall 25 and the second protruding
wall 27. Therefore, slip-out of the peripheral edge 15a of the
upholstery material 15 from the recessed groove 19 can be reliably
restricted by the first protruding wall 26 and the second
protruding wall 27. In addition, even in a case where the
tightening cord 18 or the peripheral edge 15a of the upholstery
material 15 directly abuts against neither the first protruding
wall 26 nor the second protruding wall 27, the displacement of the
tightening cord 18 or the upholstery material 15 can be restricted
by the first side wall 24 and the second side wall 25 that are
walls of the recessed groove 19.
[0064] Moreover, in the chair 1 related to this embodiment, the
recessed groove 19 is provided in the lower surface of the base
plate 13 so as to be continuous in the circumferential direction of
the base plate 13, the first side wall 24 is constituted of an
inside wall of the recessed groove 19, and the second side wall 25
is constituted of an outside wall of the recessed groove 19.
Therefore, when the upholstery material 15 is attached, the
tightening cord 18 or the peripheral edge 15a of the upholstery
material 15 can be easily arranged inside the first protruding wall
26 or the second protruding wall 27, continuously pushing the
tightening cord 18 or the peripheral edge 15a of the upholstery
material 15 into the recessed groove 19 on the base plate 13. For
this reason, the upholstery material 15 can be easily attached.
Moreover, since the displacement of the tightening cord 18 or the
peripheral edge 15a of the upholstery material 15 is restricted
within the continuous recessed groove 19, the curling of the
upholstery material 15 can be made less likely to occur.
[0065] However, the continuous recessed groove 19 may not
necessarily be formed in the lower surface of the base plate 13. As
in a second embodiment illustrated in FIG. 8, the first side wall
124 and the second side wall 125 that are narrow may intermittently
protrude from the lower surface of the base plate 113 so as to run
along the direction in which the tightening cord 18 extends, and
the first protruding wall 126 and the second protruding wall 127
may be respectively provided continuously with the vicinities of
the respective protruding ends of the first side wall 124 and the
second side wall 125.
[0066] Additionally, in the chair 1 related to this embodiment, the
first protruding wall 26 and the second protruding wall 27 provided
in the linear parts 13b are arranged so as to be separated from
each other in the direction in which the tightening cord 18
extends, and to be adjacent to each other. Therefore, the length of
the first protruding wall 26 and the second protruding wall 27 can
be sufficiently extended without causing any contact between tip
parts of the first protruding wall 26 and the second protruding
wall 27. For this reason, the first protruding wall 26 and the
second protruding wall 27 can be easily bent and deformed when the
tightening cord 18 or the peripheral edge of the upholstery
material 15 is attached. Therefore, this can facilitate the
attachment of the upholstery material 15.
[0067] Particularly, in the case of this embodiment, the respective
tip parts of the first protruding wall 26 and the second protruding
wall 27 that are provided adjacent to each other in the linear
parts extend to positions with substantially half lengths of the
groove width (the separation width of the first side wall 24 and
the second side wall 25) of the recessed groove 19. Therefore, the
wide range of the recessed groove 19 is blocked by the first
protruding wall 26 and the second protruding wall 27, and the
slip-out of the peripheral edge 15a (tightening cord 18) of the
upholstery material 15 from the inside of the recessed groove 19
can be effectively prevented. Additionally, as in this embodiment,
even in a case where the respective tip parts of the first
protruding wall 26 and the second protruding wall 27 are extended
to the positions with substantially half lengths of the groove
width of the recessed groove 19, if minimal setting is made so that
the tightening cord 18 can pass through the recessed groove at
least, the work of putting the peripheral edge 15a of the
upholstery material 15 into the recessed groove 19 is not hindered
by the first protruding wall 26 and the second protruding wall
27.
[0068] FIG. 9 is a view illustrating lower surfaces of main parts
of a base plate 213 of a third embodiment of the invention.
[0069] In this embodiment, tip parts of a first protruding wall 226
and a second protruding wall 227 provided in the linear parts are
arranged at positions that face each other.
[0070] In the case of this embodiment, the tip parts of the first
protruding wall 226 and the second protruding wall 227 are arranged
to face each other. Therefore, even if the displacement direction
of the tightening cord 18 or the peripheral edge 15a of the
upholstery material 15 varies, the displacement of the tightening
cord 18 or the peripheral edge 15a of the upholstery material 15
can be reliably restricted by any one of the first protruding wall
226 and the second protruding wall 227.
[0071] FIG. 10 is a view illustrating lower surfaces of main parts
of a base plate 313 of a fourth embodiment of the invention.
[0072] In this embodiment, portions of tip parts of a first
protruding wall 326 and a second protruding wall 327 provided in
the linear parts face each other, and remaining portions thereof
are arranged so as to be separated from each other in a direction
in which the tightening cord 18 extends.
[0073] In this embodiment, even if the displacement direction of
the tightening cord 18 or the peripheral edge 15a of the upholstery
material 15 varies, the displacement of the tightening cord 18 or
the peripheral edge 15a of the upholstery material 15 can be
reliably restricted by any one of the first protruding wall 326 and
the second protruding wall 327.
[0074] Additionally, since only the portions of the tip parts of
the first protruding wall 326 and the second protruding wall 327
face each other, and remaining portions thereof are separated from
each other in the direction in which the tightening cord 18
extends, the first protruding wall 326 and the second protruding
wall 327 extend to be long along the direction in which the
tightening cord 18 extends. For this reason, the first protruding
wall 326 and the second protruding wall 327 can be easily bent and
deformed when the tightening cord 18 or the peripheral edge 15a of
the upholstery material 15 is attached. For this reason, the
attachment of the upholstery material 15 can be facilitated.
[0075] The invention is not restricted to the above embodiments,
and various design changes can be made without departing from the
scope of the invention. For example, although the above embodiments
exemplify a load-supporting body as a seat body, it is also
possible to adopt the same structure for a backrest body of the
backrest part.
Industrial Applicability
[0076] According to the chair of the invention, since not only the
displacement of the peripheral edge of the upholstery material that
tends to narrow inward but also the displacement thereof that tends
to widen outward can be appropriately restricted, positional
deviation of the upholstery material can be more reliably
suppressed.
REFERENCE SIGNS LIST
[0077] 1: CHAIR [0078] 4: SEAT BODY (LOAD-SUPPORTING BODY) [0079]
13, 113, 213, 313: BASE PLATE [0080] 14: CUSHION MATERIAL [0081]
15: UPHOLSTERY MATERIAL [0082] 18: TIGHTENING CORD [0083] 19:
RECESSED GROOVE [0084] 24, 124: FIRST SIDE WALL [0085] 25, 125:
SECOND SIDE WALL [0086] 26, 126, 226, 326: FIRST PROTRUDING WALL
[0087] 27, 127, 227, 327: SECOND PROTRUDING WALL
* * * * *