JP2016137021A - Cover member for backrest, backrest, and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce discomfort when seated at low cost.SOLUTION: A cover member 8 which can be fitted to a backrest body 7 of a chair 1 includes a base member 80 fitted along the backrest body 7 and a skin material covering the base member 80. The base member 80 is integrally provided with: a circumferential frame part 83 which is supported along a peripheral part of the backrest body 7; and a tongue piece part 84 which is formed inside the circumferential frame part 83 and is a plate extended downward from an upper side part 83a of the circumferential frame part 83 and whose lower end part 84a is positioned above a lower side part 83b of the circumferential frame part 83 and below a middle part in the horizontal direction of the backrest body 7.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a backrest cover member, a backrest, and a chair.

  Generally, a chair includes a leg portion, a seat portion supported by the leg portion, and a backrest portion provided behind the seat portion. In such a chair, in order to improve a user's comfort, the backrest part may be provided with a cover member having cushioning properties.

  For example, Patent Documents 1 and 2 disclose a backrest portion including a backrest body and a cover member that covers the front surface of the backrest body. Such a cover member includes a frame material to be attached to the backrest main body and a tension material stretched on the front surface of the frame material. The cover member is provided by stacking and fixing the frame material on the backrest body.

The frame material (reinforcing frame) in Patent Document 1 is formed in a frame shape along the peripheral edge of the backrest body.
Further, the frame material (back pad) in Patent Document 2 has a plate shape and is provided along the front surface of the backrest main body.

Japanese Patent No. 5384807 JP 2014-90988 A

  However, in the configuration disclosed in Patent Document 1, since the frame material has a frame shape, a step is generated between the inner peripheral edge of the frame material and the opening inside the frame material. This level difference causes the user to feel uncomfortable when the user sits on the chair and leans against the backrest.

  Moreover, in the structure disclosed by patent document 2, since a frame material has comprised plate shape, the above problems do not arise. On the other hand, the frame material is previously formed into a shape along the front surface of the backrest body. In order to pre-form the frame material into a shape that conforms to the shape of the front surface of the backrest body, it is necessary to form the frame material with high accuracy, which increases manufacturing costs.

  An object of the present invention made there is to provide a backrest cover member, a backrest, and a chair that can reduce a sense of incongruity at the time of sitting while being low in cost.

The present invention employs the following means in order to solve the above problems.
A backrest cover member according to the present invention is a backrest cover member that can be attached to a backrest body of a chair, the base member being attached along the front surface of the backrest body, and the base member The base member has an upper side and a lower side along the upper and lower edges of the backrest body, and is supported by the backrest body. And a plate shape that is formed inward of the peripheral frame portion and extends downward from the upper side portion of the peripheral frame portion, and the lower end portion is above the lower side portion of the peripheral frame portion, and And a tongue piece portion located below a middle portion in the vertical direction of the backrest main body.

Thus, by providing the base member with the tongue piece portion extending downward from the upper side portion of the peripheral frame portion, when the user is seated on the chair equipped with the backrest cover member, the tongue piece The part is along the back of the user. At this time, even if the user leans strongly against the backrest, the backrest follows the user's back centering on the upper part. On the other hand, since the lower end part of a tongue piece part is located below the intermediate part of a backrest main body, a user cannot feel the level | step difference by the lower end part of a tongue piece part easily.
Further, if the user approaches the backrest, the tongue piece portion is elastically deformed along the backrest body with the lower end portion elastically deforming around the base end portion on the upper side portion side of the peripheral frame portion. There is no need to form the backrest body with high accuracy along the front surface.
In addition, since the contact of the tongue piece portion with the backrest body is hardly affected by the support state of the peripheral frame portion, the phenomenon that the tongue piece portion is pulled by the peripheral frame portion and is lifted from the front surface of the backrest main body hardly occurs. .

Further, in the backrest cover member according to the present invention, the backrest body can be attached to the backrest main body having a bulging portion that bulges forward from the lower portion than the intermediate portion, and the tongue piece portion has the lower end. The part may be located at the same height as the bulging part or below the bulging part.
Thus, by arranging the lower end portion of the tongue piece portion at the same height as or lower than the bulging portion of the backrest main body, the user can more surely make a step due to the lower end portion of the tongue piece portion. It becomes difficult to feel.

The backrest cover member according to the present invention may further include a connecting portion that connects the lower end portion of the tongue piece portion and the lower side portion of the peripheral frame portion.
By comprising in this way, it can suppress that a tongue piece part floats ahead with respect to a surrounding frame part, and can make the level | step difference of the outer peripheral edge part of a tongue piece part small.

Further, in the back cover member according to the present invention, the tongue piece portion may extend downward from both widthwise end portions of the upper side portion of the peripheral frame portion.
By comprising in this way, in the tongue piece part, the width | variety of the base end part connected with the upper side part of the surrounding frame part becomes large. Thereby, when a user leans, it becomes difficult to feel the level | step difference of the both-ends part of a tongue piece part in the base end part side of a tongue piece part.

Further, in the backrest cover member according to the present invention, the tongue piece portion is dimensioned in the width direction from the base end portion between the base end portion on the upper side portion side and the lower end portion of the peripheral frame portion than the base end portion. May have a narrow width portion and a wide width portion having a width dimension larger than that of the narrow width portion below the narrow width portion.
With this configuration, when the user leans, the tongue piece is easily deformed at the narrow portion. Therefore, the tongue piece is easily deformed along the back of the user.

Further, in the backrest cover member according to the present invention, the tongue piece portion may be thinner than the upper side portion of the peripheral frame portion.
By comprising in this way, a tongue piece part becomes flexible with respect to a surrounding frame part, and a tongue piece part becomes easy to deform | transform along a user's back.

Further, in the backrest cover member according to the present invention, the tongue piece portion may have a slit extending in the width direction between the upper side portion and the lower end portion of the peripheral frame portion. Good.
By configuring in this way, the tongue piece portion is easily deformed at the slit portion. Therefore, the tongue piece is easily deformed along the back of the user.

The backrest according to the present invention is characterized in that the backrest cover member as described above is mounted on the backrest body.
The chair according to the present invention includes a leg portion, a seat portion supported on the leg portion, and a backrest body provided at the rear of the seat portion. Such a backrest cover member is mounted.

In such a backrest and chair, when the user sits on the chair with the backrest cover member, the tongue piece deforms along the back of the user, and the user Difficult to feel steps.
Further, if the user approaches the backrest, the tongue piece portion is elastically deformed and follows the backrest main body. Therefore, it is necessary to form the backrest cover member with high accuracy along the front surface of the backrest main body. Absent.

  According to the backrest cover member, the backrest, and the chair according to the present invention, it becomes difficult to feel the level difference due to the tongue piece, so that it is possible to reduce the uncomfortable feeling when sitting. In addition, the backrest member does not need to be formed with high accuracy along the front surface of the backrest body, and can be manufactured at low cost.

1 is a front view of a backrest cover member, a backrest, and a chair according to an embodiment of the present invention. It is a side view of the said chair. It is a front view in the state where a part of backrest of the above-mentioned chair was disassembled. It is SS sectional drawing of FIG. 7 in a backrest. It is SS sectional drawing of FIG. 7 in a backrest main body. It is the perspective view which looked at the backrest from diagonally right rear. It is a front view which shows the state which mounted | wore the backrest main body of the chair which comprises the cover member. It is the perspective view which looked at the state which attached the base member to the backrest main body from diagonally left front. It is SS sectional drawing of FIG. 7 in a base member. It is a rear view of a base member. It is the perspective view which looked at the state by which the upper engaging claw formed in the base member was engaged with the long hole of the backrest main body from diagonally back. It is sectional drawing corresponding to the XII-XII cross section of FIG. It is the perspective view which looked at the state by which the side part engaging nail | claw formed in the base member was engaged with the long hole of the backrest main body from diagonally back. It is explanatory drawing of a side part engaging claw periphery.

  Hereinafter, an embodiment of a backrest cover member and a chair according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size. In the following description, the front, rear, top, bottom, left, and right directions indicate directions viewed from the seated person. Further, “front” of the seated person is indicated by an arrow FR in the figure, “upward” of the seated person is indicated by an arrow UP in the figure, and “left side” of the seated person is indicated by an arrow LH in the figure.

FIG. 1 is a front view of the chair 1 of the present embodiment. FIG. 2 is a side view of the chair 1 of the present embodiment.
As shown in FIGS. 1 and 2, the chair 1 of the present embodiment includes a support structure (leg part) 2, a seat part 3, a hinge 4, and a backrest 6.

  The support structure 2 is integrally provided with a pair of left and right legs 2a and a front frame 2b that connects the legs 2a. Such a support structure 2 is formed by molding a tubular material made of a metal material.

  The leg 2a includes a front leg 2a1 disposed at the front, a rear leg 2a2 disposed at the rear, an upper connecting rod 2a3 that connects the front leg 2a1 and the rear leg 2a2, and a caster 2a4. The front leg 2a1 is slightly inclined and extends in the vertical direction so that the upper end is disposed inside the chair 1 with respect to the lower end, and the upper end is integrally connected to the front frame 2b. The rear leg 2a2 is arranged behind and in front of the front leg 2a1, and extends in the vertical direction with a slight inclination so that the upper end is arranged inside the chair 1 rather than the lower end. The upper end portion of the rear leg 2a2 protrudes above the upper connecting rod 2a3. The upper connecting rod 2a3 extends in the front-rear direction so as to connect the front leg 2a1 and the rear leg 2a2 below the seat portion 3. Such an upper connecting rod 2a3 is integrally connected to the front leg 2a1 and the rear leg 2a2, for example, by welding or brazing. The casters 2a4 are provided at each of the lower end of the front leg 2a1 and the lower end of the rear leg 2a2, and in the present embodiment, a total of four casters 2a4 are provided as shown in FIG. These casters 2a4 enable the entire chair 1 to be moved back and forth and left and right.

  The front frame 2b extends horizontally so as to connect the upper ends of the front legs 2a1 of the pair of left and right legs 2a, and both ends are curved downward and connected to the front legs 2a1. The front frame 2b is integrally connected to the front legs 2a1, for example, by welding or brazing. The front frame 2b functions as a stopper for the seat portion 3 that can be rotated about the hinge 4, and supports the seat portion 3 from below.

  The seat portion 3 is a portion that supports the user from below, and a hinge 4 is connected to each of the rear end side portions. Such a seat portion 3 is supported by a hinge 4 so that the front end can move up and down around the rear end. The hinges 4 are respectively provided for the rear legs 2a2 of the pair of left and right legs 2a, and two hinges are provided in total so as to sandwich the seat portion 3 in the left-right direction. These hinges 4 rotatably support the seat portion 3 as described above.

  The backrest 6 is supported by the upper ends of the rear legs 2a2 of the pair of left and right legs 2a, and supports the user from behind.

FIG. 3 is a front view of the chair 1 of the present embodiment in a state where a part of the backrest 6 is disassembled. FIG. 4 is a sectional side view of the backrest 6 at a position shifted from the center in the left-right direction. FIG. 5 is a sectional side view of the backrest body at a position displaced from the center in the left-right direction.
As shown in FIGS. 3 and 4, in the chair 1 of the present embodiment, the backrest 6 includes a backrest body 7 and a cover member (backrest cover member) 8.

  The backrest body 7 is a plate-like member that is curved along the back of the user. The backrest body 7 is formed of a resin or the like having rigidity capable of supporting the user from the rear and receiving a load from the user.

As shown in FIG. 5, the backrest main body 7 is formed so that the central portion 7 c bulges rearward with respect to the left and right side edge portions 7 s when viewed in a plan view.
Further, when the central portion of the backrest body 7 in the left-right direction is viewed in a side cross-section, a certain inclination angle is formed between the upper edge portion 7d and the lower edge portion 7e of the backrest body 7 from the lower side to the upper side. A backrest surface (front surface) 7f inclined by θ1 and an upper curved surface 7g curved continuously toward the rear and formed below the backrest surface 7f are formed on the backrest surface 7f. A lower flat surface portion 7h having a rearward inclination angle θ2 smaller than the surface 7f, and a bulging portion 7j formed between the backrest surface 7f and the lower flat surface portion 7h and bulging forward. . The bulging portion 7j is curved so as to bulge forward between the lower portion of the backrest surface 7f and the lower flat surface portion 7h.

  Here, in the bulging portion 7j, the intersection point K is a position where the tangent line S1 extending in the vertical direction along the backrest surface 7f and the tangent line S2 extending in the vertical direction along the lower flat surface portion 7h intersect. A position where an orthogonal line S3 extending from the intersection K toward the surface of the bulging portion 7j intersects the bulging portion 7j is defined as a protruding position P of the bulging portion 7j. The bulging portion 7j and the protruding position P are formed below the intermediate portion between the upper edge portion 7d and the lower edge portion 7e of the backrest body 7 and at a position above the lower edge portion 7e by a predetermined dimension. Yes.

FIG. 6 is a perspective view of the backrest 6 as viewed obliquely from the right rear.
As shown in FIGS. 1 and 6, the left and right end portions of the backrest body 7 are provided with insertion portions 7 a into which the front end portions of the rear legs 2 a 2 can be inserted from below. The backrest body 7 is fixed to the support structure 2 by inserting the front end portion of the rear leg 2a2 into these insertion portions 7a.

  As shown in FIGS. 3 and 6, the backrest body 7 has a number of linear or curved long holes 7 b (through holes). In the upper edge portion 7d of the backrest body 7, long holes 7b1 having a relatively long length and long holes 7b2 having a relatively short length are alternately arranged in the left-right direction.

  Further, a hood portion 9 that bulges rearward and covers the lower edge portion 7e is integrally formed on the lower edge portion 7e of the backrest main body 7.

  As shown in FIG. 2, the cover member 8 includes a plate-like base member 80 disposed so as to face the backrest body 7, a cushion material (not shown) disposed on the front side of the base member 80, and a cushion A cover (skin material) 82 that covers the material (not shown) and whose edge is fixed to the base member 80 is laminated.

FIG. 7 is a front view showing a state in which the base member 80 constituting the cover member 8 is mounted on the backrest body 7 of the chair 1. FIG. 8 is a perspective view of a state in which the base member 80 is mounted on the backrest main body 7 as viewed obliquely from the left front. FIG. 9 is a sectional side view of the base member 80 at a position shifted from the center in the left-right direction. FIG. 10 is a rear view of the base member 80.
As shown in FIGS. 7 and 8, the base member 80 is formed so as to cover a region excluding the insertion portions 7 a at both left and right ends on the front surface of the backrest main body 7. The base member 80 includes a peripheral frame portion 83 that forms an outer edge portion thereof, a tongue piece portion 84 that is formed inside the peripheral frame portion 83, a lower end portion 84 a of the tongue piece portion 84, and a lower side portion of the peripheral frame portion 83. And a connecting portion 85 that connects the left and right central portions of 83b. The base member 80 is integrally formed by resin molding, for example.

  The peripheral frame portion 83 includes an upper side portion 83a and a lower side portion 83b that extend in the left-right direction, and side sides 83c and 83d that extend vertically between the left and right ends of the upper side portion 83a and the lower side portion 83b.

  The tongue piece 84 is formed to extend from the upper side 83a of the peripheral frame 83 toward the lower side 83b. The lower end portion 84a of the tongue piece portion 84 and the left and right side end portions 84b and 84c are formed at positions spaced apart from the lower side portion 83b and the side side portions 83c and 83d of the peripheral frame portion 83 by a predetermined distance. . As a result, a substantially U-shaped opening is formed between the lower side 83b and the side sides 83c and 83d of the peripheral frame 83 and the lower end 84a and the side ends 84b and 84c of the tongue piece 84. 86, 86 are formed. The connecting portion 85 may be eliminated and the opening 86 connected to one may be used.

  The tongue piece portion 84 is formed such that a lower end portion 84a thereof is located at the same position as or lower than the protruding position P of the bulging portion 7j of the backrest body 7. And as shown in FIG. 4, the upper side part 83a of the surrounding frame part 83, and the tongue piece part 84 extended below from the upper side part 83a are the upper curved surface 7g of the backrest main body 7, the backrest surface 7f, the bulging part. 7j is formed.

As shown in FIGS. 7 and 8, the tongue piece portion 84 as a whole has a smaller width dimension in the left-right direction of the lower end portion 84 a relative to the base end portion 84 d on the upper side portion 83 a side of the peripheral frame portion 83. It is formed as follows. The base end portion 84 d of the tongue piece portion 84 extends from both left and right end portions of the upper side portion 83 a of the peripheral frame portion 83.
The side end portions 84b and 84c of the tongue piece portion 84 are formed with concave portions 84s that are curved so as to be recessed inward in the left-right direction at a position below the base end portion 84d by a predetermined dimension. Furthermore, convex portions 84t bulging outward in the left-right direction are formed on the side end portions 84b and 84c of the tongue piece portion 84 below the concave portion 84s. And the tongue piece part 84 is curvedly formed so that the width dimension of the left-right direction may become small gradually toward the lower end part 84a from the convex part 84t.
As a result, the tongue piece 84 has a narrow width portion 84N in which the left and right concave portions 84s and 84s are narrower in the horizontal direction than the upper base end portion 84d and the lower convex portions 84t and 84t. It is said that. Further, the tongue piece portion 84 has a left and right convex portions 84t, 84t below the narrow width portion 84N and a wide width portion 84M having a width in the left-right direction larger than that of the narrow width portion 84N.

  As shown in FIGS. 9 and 10, on the back surface 80 b of the base member 80, a stepped portion 87 extending in the left-right direction is formed at the base end portion 84 d of the tongue piece portion 84. In the base member 80, the portion below the step portion 87 is formed so that the plate thickness is smaller than the step portion 87. That is, the tongue piece portion 84 is formed to have a smaller plate thickness than the upper side portion 83a of the peripheral frame portion 83.

  Further, a plurality of slits 88 extending in the left-right direction are formed in the tongue piece portion 84 below the stepped portion 87 at intervals in the left-right direction.

Such a tongue piece portion 84 is elastically deformable with the lower end portion 84a side being a free end with respect to the base end portion 84d integrally fixed to the peripheral frame portion 83.
At this time, the tongue piece portion 84 has a small thickness below the step portion 87, and further, a slit 88 and a narrow width portion 84N are formed, so that the tongue piece portion 84 has the base end portion 84d side as a fixed end. The lower end portion 84a is free to be elastically deformed.

  A plurality of notches 90 extending downward from the upper edge 83 s of the peripheral frame portion 83 are formed on both sides in the left-right direction on the upper side portion 83 a of the peripheral frame portion 83. By these cutouts 90, the peripheral frame portion 83 is easily elastically deformed following the planar cross-sectional shape of the upper edge portion 7 d of the backrest body 7.

  Further, side plate portions 83e and 83f projecting inward in the left-right direction are formed on the side portions 83c and 83d of the peripheral frame portion 83, respectively.

  On the back side of the base member 80, an upper engaging claw 91, a side engaging claw 92, and a lower engaging hook 93 are integrally formed.

FIG. 11 is a perspective view of the upper engaging claw 91 formed on the base member 80 engaged with the long hole 7b2 of the backrest body 7 as viewed obliquely from the rear. 12 is a cross-sectional view corresponding to the XII-XII cross section of FIG.
A plurality of upper engaging claws 91 are formed on the upper side portion 83a of the peripheral frame portion 83 at intervals in the left-right direction. Each upper engaging claw 91 is formed so as to protrude rearward from the upper side portion 83 a of the peripheral frame portion 83. As shown in FIG. 6, the upper engaging claw 91 is engaged with a long hole 7 b 2 having a relatively short length among the plurality of long holes 7 b formed in the upper edge portion 7 d of the backrest body 7. .

  As shown in FIG. 11, the upper engaging claw 91 is formed so that the length in the vertical direction matches the length in the vertical direction of the long hole 7b2 to be engaged. Further, the upper engaging claw 91 is formed with a tapered surface 91t at the peripheral edge portion of the tip portion so that the dimensions in the vertical direction and the width direction become gradually smaller. Further, on both side surfaces in the width direction of the distal end portion of the upper engagement claw 91, engagement protrusions 91a protruding to the side are formed. The upper engaging claw 91 is formed such that the width dimension at the portion where the engaging projections 91a, 91a are formed is slightly larger than the width dimension of the long hole 7b2 to be engaged. The engagement protrusion 91a protrudes outward in the width direction so as to be continuous with the tapered surface 91t, and on the back side (base member 80 side) of the engagement protrusion 91a, as shown in FIG. 12, the engagement surface 91b. Is formed. The engaging surface 91b is formed to be recessed in an arc shape from the outer side in the width direction toward the inner side on the back side of the engaging protrusion 91a. In addition, you may provide the hook shape which engages from the back side of the backrest main body 7 in the up-down direction edge part of the upper engaging claw 91 at the up-down direction edge part of the long hole 7b2.

  Such an upper engaging claw 91 is engaged by being pushed into the long hole 7b2 from the front side of the backrest body 7. Specifically, when the upper engaging claw 91 is pushed into the long hole 7b2, the engaging protrusions 91a and 91a move toward the back side in the depth direction while deforming the opposite side walls of the long hole 7b2 outward. It stops when the back surface of the member 80 abuts against the surface of the backrest body 7. Thus, in a state in which the engagement protrusions 91a and 91a have stopped moving, the back surface of the engagement protrusion 91a is substantially in the same position as the back surface of the long hole 7b2, or slightly protrudes. Thereby, the engagement protrusion 91a becomes inconspicuous when the chair is viewed from the back, and the appearance is improved. Further, the engagement surface 91b on the back surface side of each engagement protrusion 91a abuts on the curved surface 7b21 at the opening edge of the long hole 7b2, so that the engagement protrusion 91a is effectively prevented from falling off to the near side. As a result, the engagement protrusions 91a and 91a are generally within the range of the long hole 7b2 in the width direction, and the appearance is improved.

FIG. 12 is a perspective view of the state in which the side engaging claws 92 formed on the base member 80 are engaged with the long holes 7b3 of the backrest body 7, as viewed obliquely from the rear.
As shown in FIGS. 9 and 10, the side engaging claws 92 are spaced apart in the vertical direction from the side plate portions 83e and 83f extending from the side portions 83c and 83d of the peripheral frame portion 83, respectively. A plurality are formed. Each side engaging claw 92 is formed to project rearward from the side plate portions 83e and 83f. As shown in FIG. 6, the side engaging claws 92 are engaged with the long holes 7 b 3 formed in the left and right side edges 7 s of the backrest main body 7.

  As shown in FIG. 12, the side portion engaging claws 92 are formed such that the length in the vertical direction matches the size in the longitudinal direction of the long hole 7b3 to be engaged. Further, the side engaging claws 92 are formed on one side surface 92a in the width direction, and are formed on the side surface 92b on the other side surface 92b and the convex portion (engaging protrusion, claw) 92s protruding sideways. A concave portion 92t that is concave toward the side. The side engaging claws 92 are formed such that the distance between the side surface 92b and the tip of the convex portion 92s is substantially the same or slightly larger than the width of the long hole 7b3.

Such side engaging claws 92 are engaged by being pushed into the long hole 7b3 from the front side of the backrest main body 7. Here, the long hole 7 b 3 is curved so as to protrude toward the center in the left-right direction of the backrest main body 7. The side engaging claws 92 are arranged so that the side surface 92b side on which the concave portion 92t side is formed faces outward in the bending direction of the long hole 7b3. Thereby, the side engaging claw 92 is easily elastically deformed along the bending direction of the curved long hole 7b3 on both sides of the recess 92t.
As described above, the side engaging claws 92 are engaged with the long holes 7b3, so that the side end portions of the base member 80 are restrained from moving in the vertical and horizontal directions with respect to the backrest body 7. Is engaged.

  Here, the operation around the side portion engaging claws 92 will be further described. First, when the side portions 83c and 83d are opposed to the backrest body 7 and the side engaging claws 92 are pushed into the long holes 7b3, the convex portions 92s bend in the direction of the concave portions 92t. At this time, since the long hole 7b3 is curved so as to protrude inward in the width direction of the backrest body 7, the length of the side of the curved inner side (outward in the width direction) is the outer side of the curve (inward in the width direction). It is slightly smaller than the length of the side. For this reason, when the side engagement claw 92 is pushed into the long hole 7b3, the upper arm portion 92c and the lower arm portion 92d above and below the recess 92t in the side engagement claw 92 are formed into the shape of the side engagement claw 92 and the long hole 7b3. Depending on the size, the elastic deformation occurs as follows.

For example, with respect to the inner peripheral surface of the long hole 7b3 extending in the direction orthogonal to the backrest surface 7f of the backrest main body 7, the side surface of the side engaging claw 92 is positioned on the outer side in the width direction of the backrest main body 7 toward the distal end side. When the side engaging claw 92 is pushed into the long hole 7b3, the upper arm portion 92c positioned on the outer side in the width direction of the backrest body 7 is strongly pressed inward in the width direction. Accordingly, the entire side engaging claw 92 is elastically deformed so as to be twisted. Due to the restoring force of this elastic deformation, the side engaging claw 92 is strongly locked by the long hole 7b3.
Further, for example, when the vertical length of the side engaging claw 92 is larger than the vertical length of the long hole 7b3, the upper and lower arm portions 92c and 92d are elastically deformed so as to fall toward the concave portion 92t. Also by the restoring force of this elastic deformation, the side locking claw 92 is strongly locked by the long hole 7b3.

In the side engaging claw 92, since the opposite side of the convex portion 92s is a concave portion 92t and there is no flesh, it is necessary to generate a reaction force against an operation in which the convex portion 92s tries to escape from the long hole 7b3 at a separate location. The restoring force to the initial state accumulated by the elastic deformation of the side engaging claws 92 described above can be the reaction force.
Since the side engaging claws 92 are largely separated from the central portion in the width direction of the backrest 6 which becomes the center of the deflection of the base member 80 due to the load from the seated person, a moment to come off from the long hole 7b3 is strong. Works. However, by generating the reaction force, the engagement strength of the side engagement claw 92 with respect to the long hole 7b3 can be increased. In addition, this makes it possible to secure the engagement strength of the side engagement claw 91 with respect to the long hole 7b3 without increasing the protrusion amount in the width direction of the projection 92S and increasing the engagement margin. Also excellent.

  As described above, the strength of engagement of the upper engagement claw 91 and the side engagement claw 92 with the long hole 9b2 and the long hole 7b3 is increased in the upper side part 83aa and the side part 83b of the base member 80. The support strength of the cover member 8 with respect to the backrest main body 7 can be increased without using a retaining member (eg, the clip 18 in Document 1) from the back side.

  As shown in FIG. 10, the lower engagement hooks 93 are formed on both sides in the left-right direction of the lower side portion 83 b of the peripheral frame portion 83. Each lower engagement hook 93 extends along the lower edge of the lower side portion 83 b of the peripheral frame portion 83. The lower engaging hook 93 includes a rear extending portion 93a extending rearward from the lower edge of the lower side portion 83b of the peripheral frame portion 83, and an upper extending portion 93b extending upward from the rear end of the rear extending portion 93a. And an L-shaped cross section.

  As shown in FIG. 6, the lower engagement hook 93 is locked to the lower edge portion 7 e of the backrest body 7 from below. The rearward extending portion 93a of the lower engaging hook 93 abuts against the lower edge portion 7e of the backrest main body 7 from below, whereby the upward movement of the base member 80 is restricted. Further, when the upper extension portion 93b of the lower engagement hook 93 abuts against the back side of the lower edge portion 7e of the backrest main body 7, the forward movement of the base member 80 is restricted. Here, since the rear of the upper extension portion 93b of the lower engagement hook 93 is covered with the hood portion 9, the lower engagement hook 93 is not exposed when viewed from the rear.

As shown in FIG. 10, the peripheral frame portion 83 of the base member 80 is provided with a plurality of hooks 95 for attaching a cushion material (not shown) and the cover 82 at intervals in the circumferential direction. . Each hook 95 is formed to protrude outward from the peripheral frame portion 83 toward the rear and the center of the base member 80.
A string-like locking cord (not shown) is inserted through the outer peripheral portion of the cover 82. The cover 82 is provided so as to cover the cushion material (not shown) and the base member 80 from the front in a state where the cushion material (not shown) is arranged along the front surface of the base member 80. The cover 82 has a locking cord (not shown) hooked on the plurality of hooks 95 on the rear surface side of the base member, and the outer periphery of the cover 82 is drawn into a purse-like shape by the locking cord (not shown). Is attached to the base member 80.

  In order to attach the cover member 8 as described above to the backrest main body 7, first, the lower engagement hooks 93, 93 of the base member 80 are locked to the lower edge portion 7 e of the backrest main body 7 from below. Subsequently, the base member 80 is pressed against the front surface of the backrest main body 7, and the upper engaging claw 91 and the side engaging claw 92 are pushed into the long holes 7b2 and 7b3 to be engaged. Thereby, the cover member 8 can be easily attached to the backrest main body 7.

According to the cover member 8 and the chair 1 as described above, the base member 80 includes the tongue piece portion 84 extending downward from the upper side portion 83a of the peripheral frame portion 83, so that the user can cover the cover member. When the user sits on the chair 1 wearing 8, the tongue piece 84 is along the back of the user. Even if the user leans strongly against the backrest 6 of the chair 1, the cover member 8 follows the back of the user centering on the upper part thereof. On the other hand, the lower end portion 84 a of the tongue piece portion 84 is positioned below the intermediate portion of the backrest main body 7, so that the user hardly feels a step due to the lower end portion 84 a of the tongue piece portion 84.
If the user approaches the backrest 6, the cantilevered tongue piece 84 is elastically deformed to follow the backrest body 7, so that the cover member 8 is placed on the backrest surface 7f of the backrest body 7. It is not necessary to form with high precision along the same.
Therefore, the cover member 8 and the chair 1 can reduce the uncomfortable feeling when sitting. The cover member 8 can be manufactured at a low cost.

  Moreover, it can contribute to cost reduction also by suppressing that the cover member 8 floats from the backrest main body 7 in the mounting state before a seated person's load is added.

  Further, the lower end portion 84a of the tongue piece portion 84 is disposed at the same height as or lower than the bulging portion 7j of the backrest main body 7, so that the user can make a step by the lower end portion 84a of the tongue piece portion 84. Is more difficult to feel.

  Further, since the connecting portion 85 that connects the lower end portion 84a of the tongue piece portion 84 and the lower side portion 83b of the peripheral frame portion 83 is provided, the tongue piece portion 84 is prevented from floating forward from the peripheral frame portion 83. The step of the outer peripheral edge of the tongue piece 84 can be reduced.

  The tongue piece 84 extends downward from both sides in the width direction of the upper side 83a of the peripheral frame 83. With this configuration, in the tongue piece portion 84, the width of the base end portion 84d connected to the upper side portion 83a of the peripheral frame portion 83 is increased. Thereby, when the user leans on the base end portion 84d side of the tongue piece portion 84, it becomes difficult to feel the step between the side end portions 84b and 84c of the tongue piece portion 84.

  Further, the tongue piece portion 84 has a narrow width portion 84N having a small width direction dimension between the base end portion 84d on the upper side portion 83a side and the lower end portion 84a on the peripheral frame portion 83. With this configuration, when the user leans, the tongue piece portion 84 is easily deformed at the narrow width portion 84N. Therefore, the tongue piece portion 84 is easily deformed along the user's back. This also makes it difficult for the user to feel the level difference due to the tongue piece 84.

In addition, since the tongue piece portion 84 is thinner than the upper side portion 83a of the peripheral frame portion 83, the tongue piece portion 84 becomes flexible with respect to the peripheral frame portion 83, and the tongue piece portion 84 becomes the user's It becomes easy to deform along the back.
Further, the tongue piece portion 84 is formed with a slit 88 extending in the width direction between the upper side portion 83a and the lower end portion 84a of the peripheral frame portion 83. Thereby, the tongue piece portion 84 is easily deformed at the slit 88 portion. Therefore, the tongue piece portion 84 is easily deformed along the user's back.
Also by these, a user becomes difficult to feel the level | step difference by the tongue piece part 84. FIG.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

For example, the upper engaging claw 91, the side engaging claw 92, and the lower engaging hook 93 have been described. However, the present invention is not limited to this, and the base member 80 may be supported by the backrest main body 7 in any configuration as long as the base member 80 can be securely attached to the backrest main body 7. . Moreover, it is good also as a structure which eliminated the connection part 85 as mentioned above.
The attachment of the cover 82 to the base member 80 is not limited to the step of covering the base member 80 in a single product state, and may be a step of covering the base member 80 with the base member 80 attached to the backrest body 7, for example.

  Moreover, about the whole structure of the chair 1 shown by the said embodiment, the thing of what kind of other structure may be sufficient.

1 Chair 2 Support structure (leg)
3 Seat portion 6 Backrest 7 Backrest body 7d Upper edge portion 7e Lower edge portion 7b Long hole 7f Backrest surface (front surface)
7j bulge 8 cover member (backrest cover member)
80 Base member 82 Cover (skin material)
83 Peripheral frame part 83a Upper side part 83b Lower side part 84 Tongue piece part 84a Lower end part 84d Base end part 84N Narrow part 84M Wide part 85 Connection part 88 Slit 91 Upper engagement claw 92 Side engagement claw 93 Lower engagement hook

Claims (9)

A backrest cover member that can be attached to the backrest body of the chair,
A base member mounted along the front surface of the backrest body;
A skin material covering the base member,
The base member is
A peripheral frame portion having an upper side and a lower side along each of an upper edge and a lower edge of the backrest main body and supported by the backrest main body;
The plate is formed inward of the peripheral frame part and extends downward from the upper side part of the peripheral frame part, and the lower end is above the lower side part of the peripheral frame part and the backrest A backrest cover member integrally including a tongue piece portion positioned below an intermediate portion in the vertical direction of the main body. It can be attached to the backrest body having a bulging portion that bulges forward from below the intermediate portion,
2. The backrest cover member according to claim 1, wherein the tongue piece portion has the lower end portion positioned at the same height as the bulging portion or below the bulging portion.   The backrest cover member according to claim 1 or 2, further comprising a connecting portion that connects the lower end portion of the tongue piece portion and the lower side portion of the peripheral frame portion.   4. The backrest according to claim 1, wherein the tongue piece portion extends downward from both end portions in the width direction of the upper side portion of the peripheral frame portion. 5. Cover member.   The tongue piece portion has a narrow width portion having a width dimension smaller than that of the base end portion between the base end portion on the upper side portion side of the peripheral frame portion and the lower end portion, and the narrow width portion. 5. The backrest cover member according to claim 1, further comprising a wide portion having a width direction dimension larger than that of the narrow width portion below the narrow portion.   6. The backrest cover member according to claim 1, wherein the tongue piece portion has a plate thickness smaller than that of the upper side portion of the peripheral frame portion.   The said tongue piece part has the slit extended in the width direction between the said upper side part of the said surrounding frame part, and the said lower end part, The Claim 1 characterized by the above-mentioned. Cover member for backrest.   A backrest, wherein the backrest cover member according to any one of claims 1 to 7 is attached to the backrest body. A leg, a seat supported on the leg, and a backrest body provided behind the seat;
The backrest cover member as described in any one of Claim 1 to 7 is mounted | worn with the said backrest main body. The chair characterized by the above-mentioned.

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