JP6300403B2 - Cushioning material for chair load support and load support for chair - Google Patents

Description

  The present invention relates to a cushion material for a chair load support such as a seat or a backrest, and a chair load support using the cushion material.

  As a load support such as a chair seat or backrest, a cushion material such as urethane is disposed on the upper part of the substrate constituting the skeleton, and the outer surface of the cushion material is covered with a sheet-like tension material. . In most of this type of load support, a cover wall protruding toward the back surface is provided on the outer peripheral edge of the cushion material, and the cover wall covers the side outer surface of the substrate. Further, in the state where the outer surface of the cushion material is covered, the outer peripheral edge portion is wound inside on the back surface side of the substrate, and the tension member is fixed to the substrate in that state.

  In such a load support, the outer peripheral edge of the tension member is wound inward on the back side of the substrate, so that a part of the outer peripheral edge of the tension member is strongly pressed against the outer edge on the rear side of the substrate. Will be. For this reason, in order to prevent the deterioration of the tension material due to the pressing, the end portion of the covering wall of the cushion material is extended, and the extension portion covers the outer edge on the back side of the substrate. Has been devised (see, for example, Patent Document 1).

  In the cushion material described in Patent Document 1, a thin extension is extended at the tip of the cover wall. In the case of this cushion material, when the outer peripheral edge portion of the tension member is wound and fixed on the back side of the substrate, the thin extension portion is bent inward by the outer peripheral edge portion of the tension member, and the extension portion is Pressed against the outer edge of the back side.

Japanese Patent No. 5230929

  The conventional cushion material covers the outer peripheral edge of the tension material between the outer peripheral edge of the tension material and the outer edge of the rear surface of the substrate when the outer peripheral edge of the tension material is wound inside and fixed on the back side of the substrate. By interposing the extended portion of the wall, deterioration of the outer peripheral edge portion of the upholstery material is prevented in advance. However, since the extension portion is formed thin at the end of the covering wall of the cushion material, the foamable molten resin is likely to concentrate on the molding region of the extension portion when the cushion material is molded. For this reason, the setting at the time of manufacture in order not to harden an extension part more than necessary is difficult. At this time, if the extension portion is hardened more than necessary, it is difficult to cause the extension portion to flexibly follow the outer edge on the back surface side of the substrate, which may cause appearance defects.

  Accordingly, the present invention provides a load support for a chair that can easily interpose a part of a cushion material between an outer peripheral edge of a tension member and an outer edge on the back side of a substrate without any difficulty in manufacturing. A cushion material and a load support for a chair are to be provided.

The cushion material of the chair load support according to the present invention is disposed on the front surface side of the substrate constituting the skeleton portion, and the outer peripheral edge portion of the tension material is covered with the tension material, and the outer peripheral edge portion of the tension material is on the back side of the substrate. Is a cushion material for a chair load support body that is wound inside and fixed to the substrate together with the upholstery material, and protrudes to the back surface side, and the outer edge of the side surface of the substrate and the outer edge of the back surface side of the substrate A cover wall is provided to cover the edge, the cover wall being disposed adjacent to the outer side surface of the side of the substrate, and a back surface from the cover wall main body to the outer edge of the substrate. An extending portion that protrudes to the side, and an inner surface that faces the outer surface of the side portion of the substrate of the covering wall is provided with a lightening portion that spans a part of the covering wall main body portion and the extending portion. It is characterized by being.
As a result, when the cushion material is attached to the substrate, the contact end of the covering wall of the cushion material with the outer side surface of the substrate is spaced from the back surface of the substrate to the front side by the amount of the hollow portion. Become. For this reason, when the outer peripheral edge of the upholstery material is wound inward on the back side of the substrate in a state of wrapping the cover wall, the extension of the cover wall can be easily started from the contact end located at a position away from the back surface of the substrate. Transforms into That is, when the extension portion is deformed so as to cover the outer edge on the back surface side of the substrate, the deformation starts from the contact end located at a position separated from the back surface of the substrate. Even if it is not made extremely thin, the extension portion can flexibly follow the outer edge of the back surface side of the substrate.

The lightening portion may be formed continuously from a part of the covering wall main body portion over the entire extending direction of the extension portion.
In this case, since the hollow portion does not have a complicated concave shape, the cover wall can be easily taken out of the mold when the cushion material is molded.

The depth dimension of the cutout portion in a direction substantially orthogonal to the side outer surface of the substrate in the cover wall is a direction substantially orthogonal to the side outer surface of the substrate in a portion adjacent to the cutout portion in the cover wall. It is desirable to set it smaller than the wall thickness dimension.
In this case, since the thickness dimension of the portion adjacent to the thinned portion in the cover wall is larger than the depth dimension of the thinned portion, there is no portion where the thickness of the cover wall becomes extremely thin. For this reason, it is possible to prevent molding defects due to concentration of molten resin during mold molding. Further, when the extension portion of the covering wall is bent inward by the entrainment of the outer peripheral edge portion of the tension member because the depth dimension of the meat removal portion is smaller than the thickness dimension of the portion adjacent to the meat removal portion. The inner surface of the extension can be brought into contact with the outer edge on the back surface side of the substrate at an early stage.

The terminal portion on the covering wall main body side of the lightening portion may be chamfered so as to form an acute angle with the outer surface of the side portion of the substrate.
In this case, by chamfering the end portion of the thinned portion, the contact end of the cover wall with the outer side surface of the substrate on the cover wall can be separated from the back surface of the substrate closer to the front surface side without reducing the thickness of the cover wall. it can.

  A chair load support according to the present invention includes a substrate that forms a skeleton, a cushion material that is disposed on a surface side of the substrate, and a tension material that covers an outer surface of the cushion material. In the chair load support body in which the outer peripheral edge is wound inwardly on the back side of the substrate and fixed to the substrate, any one of the cushion materials described above is used.

According to the present invention, the contact end of the covering wall of the cushion material with the side outer surface of the substrate is positioned away from the back surface of the substrate to the front side by the amount of the thinned portion. When the outer peripheral edge is wound inside on the back side of the substrate, the extension of the cover wall can be easily deformed starting from the contact end located at a position spaced from the back surface of the substrate. Therefore, in the present invention, the extension portion can be flexibly followed by the outer edge on the back surface side of the substrate without making the extension portion of the cover wall extremely thin, so that there is no difficulty in manufacturing. A part of the cushion material can be easily interposed between the outer peripheral edge portion of the tension member and the outer edge on the back surface side of the substrate.
Moreover, according to this invention, since the thinning part is provided in the inner surface side of the covering wall, the level | step difference by a thinning part is not exposed outside through a tension material. For this reason, high appearance quality can be obtained.

It is a side view of the chair of one Embodiment of this invention. It is a rear view of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the III-III cross section of FIG. 1 of the load support body for chairs of one Embodiment of this invention. It is a partial section perspective view of the cushion material of one embodiment of this invention. It is a partial section perspective view of the load support for chairs of one embodiment of this invention. It is an enlarged view corresponding to the VI section of FIG. 3 of the load support body for chairs of one Embodiment of this invention. It is an enlarged view corresponding to the VI section of FIG. 3 of the load support body for chairs of one Embodiment of this invention. It is an enlarged view corresponding to the VI section of FIG. 3 of the load support body for chairs of other embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

1 and 2 are a side view and a rear view showing the overall configuration of the chair 1 of this embodiment.
As shown in these drawings, the chair 1 of this embodiment includes a leg portion 2 placed on the floor F, a box-shaped support base 3 installed at the upper end of the leg portion 2, and a seat frame 5. And a backrest portion 6 that extends from the support base 3 to the rear upper side and supports the back of the seated person seated on the seat body 4. In this embodiment, the seat body 4 constitutes a chair load support.

  The leg 2 includes a multi-leg 7 with casters 7 a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring as a lifting mechanism, and has a support base 3 at the upper end of the pedestal 8. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 8 and a tilt adjustment mechanism for the backrest 6. The backrest 6 includes a pair of backrest support frames 9 that are substantially L-shaped in side view, and a backrest body that directly supports the back of a seated person that is attached to the rear upper portion of the backrest support frame 9 and seated on the seat 4. 10, and the front end portion of the back support frame 9 is pivotally supported by the support base 3 so as to be swingable. In the figure, reference numeral 12 denotes a pivot shaft of the back support frame 9 on the support base 3. Further, a gas spring 20 for urging the backrest body 10 in the upright direction is connected between the rear end portion of the support base 3 and the intermediate portion of the backrest support frame 9 so as to be swingable.

  The backrest body 10 of the backrest portion 6 includes a back plate 11 that forms a skeleton, a tension member 13 that covers a portion of the front plate side and a part of the back surface of the back plate 11, and a back surface side (rear surface) of the back plate 11. And a cover member 14 that covers the side). A cushion material (not shown) made of urethane or the like is fused to the back surface of the tension member 13.

  The cover member 14 covering the back surface side of the back plate 11 is fixed to the back surface side of the back plate 11 by appropriate means such as uneven fitting. In the case of this embodiment, the upward extending portion 9 a of the backrest support frame 9 that rises upward from the rear side of the seat body 4 is fastened and fixed to the front side of the cover member 14. The front side of the upward extension 9 a of the support frame 9 is covered with a back plate 11.

FIG. 3 is a view showing a cross section of the seat body 4 corresponding to the III-III cross section of FIG. 1. For the seat 4 described below, unless otherwise specified, the surface on the side where the seated person is seated is referred to as the front surface, and the surface opposite to the side where the seated person is seated is referred to as the back surface.
The seat body 4 includes a seat plate 15 which is a substrate constituting a skeleton, a cushion material 50 made of urethane or the like disposed on the surface side of the seat plate 15, an outer surface of the cushion material 50, and an outer peripheral edge of the seat plate 15. And a sheet-like upholstery material 16 that covers a part of the back surface and a part of the back surface.

FIG. 4 is a partial cross-sectional perspective view of the cushion material 50 as viewed from the back side, and FIG. 5 is a partial cross-sectional perspective view of the seat plate 15 assembled with the cushion material 50 as viewed from the back side.
The seat plate 15 is formed of a synthetic resin having a strength capable of supporting the load of the seated person, and has a substantially rectangular shape with rounded four corners when viewed from above. A plurality of reinforcing ribs (reference numerals omitted) are projected from the front and back surfaces of the seat plate 15, and these reinforcing ribs enhance the rigidity in the front and back direction (bending direction) and torsional direction. Further, a concave groove 19 extending in the circumferential direction is formed on the back surface of the outer peripheral edge portion of the seat plate 15, and the outer peripheral edge portion of the tension member 16 covering the cushion material 50 and the seat plate 15 is supported in the concave groove 19. It has come to be. The recessed groove 19 protrudes from the front surface side of the seat plate 15 toward the back surface and forms an outer end surface of the seat plate 15, and an inner wall 19 b provided substantially parallel to the outer wall 19 a on the inner side of the seat plate 15. And a bottom wall 19c connecting the outer wall 19a and the inner wall 19b. Restricting claws 21a and 21b for restricting displacement of the outer peripheral edge of the tension member 16 are provided at appropriate positions facing the recessed grooves 19 of the outer side wall 19a and the inner side wall 19b.

  As shown in FIG. 3, an insertion hole (not shown) is provided in the outer peripheral edge of the tension member 16, and a tightening string 18 is inserted into the insertion hole. In the state where the tension member 16 wraps the tension member 16 from the outer side surface of the cushion material 50 to the outer peripheral edge portion of the seat plate 15, the outer periphery portion of the tension member 16 is tightened on the back surface side of the seat plate 15, In this state, both ends are bound with a predetermined tension. At this time, the fastening string 18 and the outer peripheral edge portion of the tension member 16 are inserted into the concave groove 19 of the seat plate 15, and the displacement is regulated by the regulation claws 21 a and 21 b.

  The cushion material 50 includes a cushion main body 22 disposed on the front surface side of the seat plate 15, a covering wall 23 that protrudes from the outer peripheral edge of the cushion main body portion 22 to the back surface side and covers the outer side of the outer wall 19 a of the seat plate 15. It is equipped with. The cushion member 50 is assembled to the seat plate 15 so that the cushion body portion 22 covers the surface side of the seat plate 15 and the cover wall 23 covers the outer side surface of the seat plate 15 (the outer surface of the outer wall 19a). A positioning ridge 49 protrudes from a part of the front surface side of the seat plate 15, and the ridge 49 is provided at a position corresponding to the ridge 49 on the back surface of the cushion material 50. A recessed locking part 51 to be fitted is provided.

FIG. 6 is an enlarged cross-sectional view of the seat plate 15 and the cushion material 50 assembled to each other.
As shown in the figure, the covering wall 23 of the cushion material 50 includes a covering wall main body 24 disposed adjacent to the outer surface (side outer surface) of the outer wall 19 a of the seat plate 15, and the covering wall main body 24. And an extension portion 25 that protrudes to the back side from the extension end (outer end edge) of the outer wall 19a of the seat plate 15. Here, the covering wall main body 24 refers to an area extending to the same extension length as the extending end of the outer wall 19 a of the covering wall 23, and the extending portion 25 is the outer side of the covering wall 23. This refers to a region protruding from the extended end of the wall 19a.

  Of the covering wall 23, a lightening portion 26 extending from a part of the covering wall main body portion 24 to the entire extending direction of the extension portion 25 is formed on the inner side surface 23 a facing the outer surface of the outer wall 19 a of the seat plate 15. Is provided. Except for the region located in the cover wall main body 24, the thickness of the lightening portion 26 is substantially constant in the direction substantially perpendicular to the side outer surface of the seat plate 15. The depth of the lightening portion 26 in the region located in the covering wall main body portion 24 is abruptly narrowed in a direction substantially orthogonal to the side outer surface of the seat plate 15, and its terminal portion is connected to the side outer surface of the seat plate 15. The formation is chamfered to form an acute angle. In FIG. 5, reference numeral 48 denotes a chamfered shape portion of the end of the thinned portion 26.

  Here, when the cushion member 50 is attached to the seat plate 15, as shown in FIG. 6, an area of the inner side surface 23 a of the covering wall 23 excluding the lightening portion 26 of the covering wall main body 24. Comes into contact with the outer side surface of the seat plate 15. At this time, an end portion of the chamfered shape portion 48 which is a terminal portion of the lightening portion 26 becomes a contact end P with the side outer surface of the seat plate 15. The contact end P is spaced from the extending end of the outer wall 19 a of the seat plate 15 (the outer end edge on the back side of the seat plate 15) by a set distance in the surface direction of the seat plate 15.

  In the case of this embodiment, the depth dimension T2 of the lightening portion 26 in the direction substantially orthogonal to the side outer surface of the seat plate 15 in the cover wall 23 is the seat of the portion adjacent to the lightening portion 26 in the cover wall 23. It is set smaller than the wall thickness dimension T1 in a direction substantially orthogonal to the side outer surface of the plate 15.

FIG. 7 is a view sequentially showing the state of assembly of the seat body 4 with (A), (B), and (C). Hereinafter, the assembly of the seat body 4 will be described with reference to FIG.
First, as shown in FIG. 7A, the cushion material 50 is attached to the surface and the outer peripheral edge of the seat plate 15, and the covering wall 23 of the cushion material 50 is disposed outside the outer side surface of the seat plate 15. To do. At this time, the inner surface 23a of the covering wall 23 contacts the outer surface of the outer wall 19a of the seat plate 15, but the contact end P is located at a position spaced from the extended end of the outer wall 19a of the seat plate 15 to the surface side. Become.
Next, as shown in FIG. 7B, the outer peripheral edge of the tension member 16 is attached to the seat plate 15 in a state where the outer surface of the cushion material 50 is covered with the sheet-like tension material 16 and the cushion material 50 is wrapped. Wrap inside on the back side. Then, from this state, the tightening string 18 on the outer peripheral edge of the tension member 16 is tightly bound, and the outer peripheral edge of the tension member 16 and the tightening string 18 are connected to the seat plate 15 as shown in FIG. It arrange | positions in the ditch | groove 19 of the back surface.

  By the way, when the outer peripheral edge of the upholstery material 16 is tightened by the fastening string 18 on the back surface side of the seat plate 15 in the state where the cushion material 50 is wrapped as described above, the covering wall 23 of the cushion material 50 is 7 (B), the extension 25 is gradually bent inward from the contact end P, which is spaced from the extension end of the outer wall 19a of the seat plate 15, as a starting point. At this time, the extension portion 25 receives the tightening force of the outer peripheral edge portion of the tension member 16 and bends and deforms toward the inside of the concave groove 19 of the seat plate 15, but the bending base point at this time is the outer wall. Since it is a position spaced from the extended end of 19a to the surface side, bending deformation starts relatively flexibly. When the outer peripheral edge portion of the tension member 16 is further tightened, the inner surface of the extending portion 25 comes into close contact with the end portion of the outer wall 19a.

  The cushion material 50 employed in the seat body 4 of this embodiment includes a cover wall body portion 24 in which the cover wall 23 is disposed adjacent to the outer side surface of the seat plate 15, and an extension projecting from the cover wall body portion 24. Part 25, and the inner side surface 23a of the covering wall 23 is provided with a lightening part 26 straddling the covering wall main body part 24 and the extension part 25, so that contact with the side part outer surface of the seat plate 15 is achieved. The end P is positioned away from the back surface of the seat plate 15 to the front surface side by the amount of the thinned portion 26. For this reason, when the outer peripheral edge portion of the upholstery material 16 is pulled inward on the back surface side of the seat plate 15 when the seat body 4 is assembled, the extension portion 25 of the cover wall 23 is separated from the back surface of the seat plate 15. It can be easily deformed starting from the contact end P at the position. Therefore, at the time of manufacturing the seat body 4, a part of the cushion material 50 can be easily interposed between the outer peripheral edge portion of the tension member 16 and the end portion of the outer wall 19 a of the seat plate 15.

  And since the structure of this cushioning material 50 does not need to make part of the covering wall 23 extremely thin, there is no possibility that the molten resin concentrates on the thin-walled portion and hardens when the cushioning material 50 is molded. For this reason, when the structure of this cushion material 50 is employ | adopted, the product of the stable quality can be obtained without accompanying the difficulty of manufacture.

  Moreover, in the cushion material 50 of this embodiment, since the lightening part 26 is provided on the inner surface 23 a side of the covering wall 23, a step due to the lightening part 26 does not appear outside through the tension member 16. For this reason, when the seat body 4 is viewed from the back side, the appearance is good.

  In particular, in the cushion material 50 of this embodiment, the lightening part 26 is formed continuously from the part of the covering wall main body part 24 to the entire region in the extending direction of the extension part 25. The concave shape by 26 becomes a relatively simple step-shaped concave shape. For this reason, when the cushion material 50 is molded, the cover wall 23 of the cushion material 50 can be easily taken out from the mold.

Further, in the case of the cushion material 50 of this embodiment, the depth dimension T2 of the lightening part 26 of the covering wall 23 is set smaller than the wall thickness dimension T1 of the part adjacent to the lightening part 26. When the extension 25 of the covering wall 23 is bent inward by the outer peripheral edge of the material 16, the inner surface of the extension 25 can be brought into contact with the end of the outer wall 19a of the seat plate 15 at an early stage. For this reason, the extension part 25 can be stably brought into contact with the end part of the outer wall 19 a of the seat plate 15.
Furthermore, in the case of this cushioning material 50, the thickness T1 of the portion adjacent to the thinned portion 26 is larger than the depth dimension T2 of the thinned portion 26, so that the thickness of the covering wall 23 becomes extremely thin. There is no. Therefore, when the cushion material 50 is molded, it is possible to more surely prevent molding defects caused by the molten resin concentrating on an extremely thin portion.

  Further, in the cushion material 50 of this embodiment, since the chamfered shape portion 48 that forms an acute angle with the outer side surface of the seat plate 15 is provided at the end of the lightening portion 26 of the covering wall 23, The contact end P of the cover wall 23 with the outer surface of the side portion of the seat plate 15 can be separated from the rear surface of the seat plate 15 on the front surface side without reducing the thickness. Further, since the position of the contact point P can be arranged on the surface side of the seat plate 15 by the chamfered shape portion 48, the die-cutting property when the cushion material 50 is molded is also improved.

FIG. 8 is a view corresponding to FIG. 7A of the first embodiment showing a cross section of a part of the seat body of the second embodiment. Hereinafter, although 2nd Embodiment is described, the same code | symbol shall be attached | subjected to the same part as 1st Embodiment, and the overlapping description shall be abbreviate | omitted.
The seat body of the second embodiment is the same as that of the first embodiment in the structure of the seat plate 15 and the tension member (not shown in FIG. 8), but the structure of the cushion material 150 is that of the first embodiment. And slightly different. The cushioning material 150 of this embodiment is provided with a lightening portion 126 on the inner side surface 23a of the covering wall 23 as in the first embodiment. The lightening portion 126 is a covering wall main body of the covering wall 23. Rather than being formed continuously from a part of the part 24 to the entire region in the extending direction of the extension part 25, it extends over a part of the covering wall main body part 24 and a part of the extension part 25 adjacent thereto. It is formed in a substantially arc shape. In this embodiment, substantially the same effect as that of the first embodiment can be obtained.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the seat body 4 constitutes the load support body, but the load support body is not limited to the seat body and may be a backrest portion.
In the above embodiment, the outer peripheral edge portion of the tension member 16 is fastened to the substrate by the fastening string 18 on the back surface side of the substrate (seat plate 15). The portion may be fixed to the back surface side of the substrate by 18 locking means other than the fastening string.

4 Seat (load support)
15 Seat plate (substrate)
16 Covering material 23 Covering wall 24 Covering wall body part 25 Extension part 26,126 Meat removal part 50,150 Cushion material

Claims (5)

Arranged on the surface side of the substrate constituting the skeleton, the outer peripheral edge of the tension member is wound inside on the back side of the substrate with the outer side surface covered with the tension member, and the substrate together with the tension member. A cushion material for a chair load support to be fixed,
Protruding to the back side, a cover wall is provided to cover the outer side edge of the substrate and the outer edge of the back side of the substrate,
The cover wall includes a cover wall main body disposed adjacent to the outer side surface of the substrate, and an extension protruding from the cover wall main body to the back surface side of the outer edge of the substrate. And
A load support for a chair, characterized in that an inner side surface of the covering wall that faces the outer surface of the side portion of the substrate is provided with a lightening portion straddling a part of the covering wall main body portion and the extension portion. Body cushioning material.   2. The chair load support according to claim 1, wherein the lightening portion is continuously formed from a part of the covering wall main body portion to the entire extending direction of the extension portion. Cushion material.   The depth dimension of the cutout portion in a direction substantially orthogonal to the side outer surface of the substrate in the cover wall is a direction substantially orthogonal to the side outer surface of the substrate in a portion adjacent to the cutout portion in the cover wall. The cushion material for a load support for a chair according to claim 1, wherein the cushion material is set to be smaller than a wall thickness dimension of the chair.   4. The terminal according to claim 1, wherein the end portion of the lightening portion on the side of the covering wall main body is chamfered so as to form an acute angle with a side outer surface of the substrate. Cushion material for load support for chairs. A substrate forming a skeleton, and
A cushioning material disposed on the surface side of the substrate;
A tension member covering the outer surface of the cushion material,
In the load support for a chair in which the outer peripheral edge portion of the upholstery material is wound inside on the back side of the substrate and fixed to the substrate,
A load support for a chair, wherein the cushion material according to any one of claims 1 to 4 is used.

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