JP6233960B2 - Chair - Google Patents

Description

  The present invention relates to a chair having an improved load support structure such as a backrest or a seat.

  The backrest or seat of a chair used for office work etc. is usually a part where cushioning material such as urethane is placed on the surface side of the board that forms the skeleton part, and the outer surface of the cushioning material and the outer peripheral edge of the board Is covered with a sheet-like upholstery.

When attaching this type of chair upholstery, it is easy to apply stable tension to the entire area of the upholstery, so the periphery of the upholstery is folded back to the back side of the board and pulled inward, and the end of the periphery Many methods of locking and fixing to the back surface of the substrate are used (for example, see Patent Documents 1 and 2).
A chair that employs such a technique is superior in that the tension of the upholstery material itself is utilized and it is not necessary to form a complicated support structure for attaching the upholstery material on the substrate.

Japanese Patent No. 3728576 Japanese Patent No. 4964501

By the way, in the said conventional chair, the peripheral part of a tension material is turned back to the back side by the outer peripheral part of a board | substrate, and the load at the front side of a tension material is strongly pulled in to the inner peripheral side. Tension is generated to support At this time, since the tension member draws the end of the peripheral part to the inner peripheral side with the outer peripheral end of the base material being wound, the support reaction force of the tension acting on the front side of the tension material is It becomes the largest at the entrainment part, and the cushion material is crushed most at this part. For this reason, if the cushion material slides slightly with respect to the substrate at the portion where the tension member is wound around the outer peripheral edge of the substrate, the slight slip is triggered, and a large elastic reaction force is generated near the portion where the cushion material is wound. The possibility of shifting the position of the material is increased.
In addition, in the case of the conventional chair described above, since there is no means for accurately positioning the cushion material disposed on the back surface of the upholstery material with respect to the base material, which portion on the cushion material is crushed and supported. It is not possible to accurately control how much the reaction force increases in which part. For this reason, the possibility of the positional displacement of the upholstery differs for each individual chair, and complicated quality control is forced to provide uniform quality.

  Further, in recent years, as the design of the chair backrest and seat body, a design in which the outer peripheral edge is continuously curved toward the back side is often adopted. This type of design is intended to eliminate the angular impression at the edge of the chair, so that the outer peripheral edge of the board is shaped to be curved toward the back side, and the cut tension is It is essential that the peripheral edge of the material is a continuous surface without sewing or adhesion. For this reason, particularly when this type of design is adopted, the cushion material on the back side of the tension material becomes more slippery along the pull-in direction of the tension material at the outer peripheral end of the substrate, and the above-mentioned position of the tension material The possibility of deviation increases.

  Therefore, the present invention adopts a structure in which the peripheral portion of the tension member is folded back to the back side of the base, and the peripheral portion is pulled to the inner peripheral side of the base and locked to the base, but the tension is triggered by the slip of the cushion material. It is an object of the present invention to provide a chair capable of suppressing the displacement of materials.

In the chair according to the present invention, a substrate having a load bearing surface in the inner area of the surface a substrate constituting a skeleton, and the cushion member disposed at least on the surface side of the substrate, the outer surface of at least the cushion material and the covers according to the outer peripheral edge portion of the substrate, chair periphery with a load bearing body having a stretched member supported drawn into folded inner circumference side to the rear side of the outer peripheral edge of the substrate in, of the substrate, the surface of the outer peripheral edge portion positioned on the outer side than the load bearing surface, the convex portion for locking the cushion member projects Menjika direction crossing the plane direction, the stretched member A plurality of the substrates are provided along the pull-in direction from the back side of the substrate .
In this invention, the cushion member is engaged by a plurality of convex portions provided on the surfaces of the outer peripheral edge portion of the substrate, slip along the pull direction of the cushion material at the outer peripheral edge of the substrate is restricted. Thereby, the cushion material slides with respect to the outer peripheral edge of the substrate , and the tension member is restrained from being displaced with respect to the substrate due to the elastic reaction force of the cushion material.

In this case, since the cushion material is locked by the convex portions on the substrate at a plurality of locations along the pull-in direction of the tension material, the displacement of the tension material receiving the pull-in force from the back side of the substrate is more advantageously suppressed. It becomes possible to do.

The cushion member is formed in a larger outside dimension than the substrate, the outer peripheral edge portion is folded back on the back side of the outer peripheral edge of the substrate, wherein the convex portion, the back side from the surface of the outer peripheral edge of the substrate A plurality of the tension members may be provided along the pull-in direction from the back side of the substrate .
Thus, the cushion material wraps around the outer peripheral edge of the substrate from the front surface side to the back surface side, and the positional deviation in the direction along the pull-in direction of the cushion material is regulated by the plurality of convex portions within the range. In addition, the cushion material gives a support reaction force to the tension material from the inner side in a range from the front surface to the back surface side of the outer peripheral edge of the substrate, and the displacement of the tension material is more strongly regulated.

Further, an outer edge bulging portion that bulges toward the back surface side is provided on the outer peripheral edge portion of the substrate , and the convex portion is provided on the outer edge bulging portion, so that the outer edge bulge is formed on the back surface side of the substrate. A tension material support portion that supports the peripheral edge portion of the tension material may be provided in a region inside the portion.
In this case, the cushion material wraps the outer peripheral edge of the substrate from the front surface side to the outer edge bulging portion on the back surface side, and the position along the direction in which the cushion material is pulled in by the convex portion provided on the outer edge bulging portion. Deviation is regulated. Further, the periphery of the clad material is folded back on the back side of the substrate, because it is pulled into the stretched member supporting portion of the inner edge bulging portion, the outer end face cushion material portion of the substrate to enclose the outer peripheral edge of the substrate The position displacement in the direction along the pull-in direction of the cushion material or the tension material is more reliably prevented.

Further, it is desirable that the tension material support portion protrudes toward the back surface side of the substrate from the outer edge bulge portion.
In this case, the stretched member supporting portion to draw the peripheral portion of the tension member inwardly on the backside of the substrate, since the protruded from the back surface of the outer edge bulging portion of the substrate, the peripheral portion of the tension member is the outer bulging portion back The cushion material is not strongly folded at the outer edge bulge portion. Therefore, the cushion member is crushed strongly at the outer bulging portion, a large reaction force in a direction away from the outer bulging portion stretched member that is folded on the back side of the substrate is prevented from acting, outside of the substrate The upholstery is strongly pressed against the surface side of the peripheral edge.

According to the present invention, since the sliding along the pull direction of the cushion material at the outer peripheral edge of the substrate is regulated by a plurality of protrusions which protrudes from the orthogonal direction to the surface of the outer peripheral edge of the substrate , folded peripheral portion of the tension member on the back side of the substrate, positional displacement of the peripheral portion even while adopting a structure for locking the substrate is pulled to the inner circumference side of the substrate, Zhang material was triggered by the slip of the cushion material Can be prevented in advance.

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 a rear view of the back board of the chair of one Embodiment of this invention. It is the rear view which removed the cover member of the backrest main body of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the VV cross section of FIG. 4 of the backrest main body of the chair of one Embodiment of this invention. It is an enlarged view of the VI section of FIG. 5 of the backrest main body of the chair of one Embodiment of this invention. It is a fragmentary sectional perspective view of the outer periphery part of the back board of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the VI section of FIG. 5 of the chair of other embodiment of this invention. It is a fragmentary sectional perspective view of the outer periphery part of the backplate of the chair of another 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, a chair 1 according to this embodiment includes a leg 2 placed on a floor F, a box-shaped support base 3 installed at the upper end of the leg 2, and a seated person. A seat body 4 that is attached to the upper surface of the support base 3 and supports the seat body 4, and supports the back of a seated person that extends from the support base 3 to the rear upper side and is seated on the seat body 4. And a backrest portion 6.
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 portion 6 includes a backrest support frame 9 having a substantially L-shape when viewed from the side, and a backrest body 10 that directly supports the back of a seated person seated on the seat body 4 attached to the rear upper portion of the backrest support frame 9. The lower end of the front portion of the back support frame 9 is connected to the tilt adjustment mechanism in the support base 3.

The backrest main body 10 of the backrest portion 6 includes a back plate 11 ( substrate, base body) constituting a skeleton portion, urethane disposed in a range from the front surface of the back plate 11 to the outer peripheral edge portion on the back surface side (rear surface side), and the like. A cushion member 12 (see FIG. 5), a sheet-like tension member 13 covering a portion of the outer surface of the cushion member 12, the outer peripheral edge of the back plate 11, and a part of the back surface (rear surface), and the back plate 11 and a cover member 14 that covers the rear surface side (rear surface side). In the case of this embodiment, the cushion material 12 is integrally joined to the back surface of the upholstery material 13 by heat welding.
Moreover, in this embodiment, the backrest main body 10 of the backrest part 6 comprises the load support body.

3 is a view of the back plate 11 as viewed from the back side, FIG. 4 is a view of the backrest body 10 with the cover member 14 removed, as viewed from the back side, and FIG. It is sectional drawing corresponding to.
The back plate 11 is made of a synthetic resin having elasticity. The back plate 11 is formed in a vertically long, substantially rectangular shape with rounded four corners when viewed from the front, and can support a portion extending from the waist to the back of the seated person on the front side. The back plate 11 supports the vicinity of the occupant's waist at a height position of about one third from the bottom in the height direction, and supports the vicinity of the back of the seat occupant in a region above it. In the following description, the region of the back plate 11 that supports the vicinity of the back of the seated person is referred to as a “back support region 11a”, and the region that supports the vicinity of the back of the seated person is referred to as the “back support region”. 11b ".

The back plate 11 constitutes a bulging region in which the waist support region 11a is curved in a convex shape in the side view, and the portion first contacts the waist of the seated person. In addition, the front surface of the back plate 11 has a shape in which a horizontal section of almost the entire area in the vertical direction is curved in a concave shape on the rear side. The concave shape of the front surface of the back plate 11 changes in the depth of depression in the vertical direction, and the vicinity of the middle portion in the vertical direction of the waist support region 11a is the largest. Further, the outer peripheral edge portion of the back plate 11 is curved toward the back surface side. In particular, the upper edge portion 11c is greatly curved toward the back surface side (rear side) so that the terminal portion approaches a substantially horizontal posture. Yes.
3 and 4, reference numeral 90 is used to obtain a flexible deformation of the back plate 11 in a region extending from a substantially central position in the vertical direction of the waist support region 11 a of the back plate 11 to the back support region 11 b. There is a slit formed.

  Further, a locking groove 15 is formed in an annular shape on the back side of the back plate 11 so as to substantially follow the outer peripheral shape of the back plate 11. The locking groove 15 is formed by an inner wall portion 15a and an outer wall portion 15b that protrude from the back surface of the back plate 11. The locking groove 15 is provided at a position spaced from the outer peripheral end of the back plate 11 toward the central region side by a set distance. As will be described in detail later, a peripheral edge portion 13a of a tension member 13 covering the back plate 11 is inserted into the locking groove 15 and locked.

  Further, in the back surface of the back plate 11, the region between the left and right sides of the back plate 11 and the outer wall portion 15 b facing the side is extended in the width direction of the back plate 11. A plurality of reinforcing ribs 17 that connect the side edges and the outer wall portion 15b are provided. The horizontal cross-section of the back plate 11 is that the waist support region 11a is the most concavely recessed, so that the reinforcing ribs 17 disposed in the waist support region 11a protrude in the front-rear direction according to the recessed depth of the recess. The height is higher than the protruding height of the other reinforcing ribs 17.

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 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 surface side of the cover member 14. The front side of the extension 9 a of the support frame 9 is covered with a back plate 11. In this embodiment, since the cover member 14 functions as a strength member that supports the input load from the seated person together with the backrest support frame 9, it is made of a highly rigid synthetic resin.
Note that the cover member 14 is not necessarily a strength member. In this case, the back plate 11 may be directly connected to the backrest support frame 9.

Here, the tension member 13 covering the front surface and the outer peripheral edge portion of the back plate 11 has its peripheral edge portion 13a folded back to the back surface side at the outer peripheral edge portion of the back plate 11, and in this state, the peripheral edge portion 13a is the back surface of the back plate 11. It is locked to.
The upholstery material 13 is cut one size larger than the back plate 11, and resin edge members 20 are attached to a plurality of portions of the peripheral edge portion 13 a that is folded back to the back surface side of the back plate 11. The edge member 20 is formed in a plate shape having a substantially L-shaped cross section as shown in FIG. The edge member 20 has an insertion piece 20a inserted into the engagement groove 15 and an outer engagement piece 20b that bends and extends in a substantially L shape from the base end of the insertion piece 20a. The peripheral edge 13a of 13 is joined to the outer surface side in the vicinity of the connection part of the insertion piece 20a and the outer locking piece 20b. In the case of this embodiment, the cushion material 12 is thinly attached to the back surface of the peripheral edge portion 13a of the tension member 13, and the edge material 20 is joined to the thin cushion material 12 portion. In addition, the joining aspect of the upholstery material 13 and the edge material 20 is not limited to the aspect of this embodiment, and the edge material 20 may be directly joined to the back surface of the upholstery material 13.

  The insertion piece 20a of the edge member 20 is formed with a fitting hole 21 penetrating in the thickness direction, and is fitted into the fitting hole 21 in the vicinity of the opening end of the inner wall portion 15a of the locking groove 15. Protrusions 22 having a substantially right triangle shape in cross section are formed. The side of the protrusion 22 on the bottom side of the locking groove 15 extends in a direction substantially perpendicular to the inner surface of the inner wall 15a. Further, the outer locking piece 20b of the edge member 20 has a locking protrusion that is displaceable in a direction in which only the outer surface on the base end side is joined to the tension member 13 and the distal end side is separated from the tension member 13 with respect to the base end portion. 23.

  In addition, the inner corner portion of the base end of the insertion piece 20a and the outer locking piece 20b of the edge member 20 is turned to the protruding end of the outer wall portion 15b of the locking groove 15 (the edge closer to the outer side of the locking groove 15). The first abutting portion 24 that abuts so as to be movable is used. In addition, it is desirable that the protruding end of the outer wall portion 15b has a circular arc shape in order to rotatably support the inner corner portion of the edge member 20. Further, the distal end portion of the insertion piece 20a of the edge member 20 has an inner wall portion of the locking groove 15 when the edge member 20 receives the tension of the tension member 13 and rotates around the first contact portion 24 as a fulcrum. The second contact portion 25 is in contact with the inner surface of 15a.

Here, each edge member 20 attached to the peripheral portion 13a of the tension member 13 is engaged with the insertion piece 20a in a state where the peripheral portion 13a of the tension member 13 is folded back to the back surface side of the back plate 11 and pulled inward. It is inserted into the groove 15 and locked.
As shown in FIG. 3 and FIG. 4, the locations where the edge member 20 in the locking groove 15 is inserted are the portions adjacent to the reinforcing rib 17 in the left and right side portions of the locking groove 15, and There are three locations spaced in the extending direction of the upper and lower sides of the locking groove 15 and locations corresponding to the four corners. On the end surface of each reinforcing rib 17 of the back plate 11 (surface in the back surface direction of the back plate 11), a locking recess 26 that can be fitted to the locking protrusion 23 of the edge member 20 is formed. As shown in FIG. 5, the locking recess 26 has a substantially triangular shape from the connecting position with the outer wall 15 b of the locking groove 15 in the end face of the reinforcing rib 17 toward the outer peripheral end of the back plate 11. It is formed in a hollow.

The edge member 20 locked to the left and right side portions of the locking groove 15 is formed from the tension member 13 after the insertion piece 20a is inserted into the locking groove 15, as indicated by a virtual line in FIG. Under the tension, the first contact portion 24 is rotated as a fulcrum. Thereby, the fitting hole 21 of the insertion piece 20 a is fitted into the protrusion 22 in the locking groove 15, and the outer locking piece 20 b is fitted into the locking recess 26 on the reinforcing rib 17. As a result, each edge member 20 is restricted from being removed from the locking groove 15 and is also restricted from being displaced in the backrest width direction.
On the other hand, the edge member 20 that is locked to the upper and lower sides of the locking groove 15 and the corners of the four corners receives the tension from the tension member 13 after the insertion piece 20 a is inserted into the locking groove 15. The fitting hole 21 of the insertion piece 20 a is fitted to the protrusion 22 in the locking groove 15 by receiving and turning about the first contact portion 24 as a fulcrum. As a result, each edge member 20 is restricted from coming off from the locking groove 15.

  As shown in FIG. 5, an outer edge bulging portion 27 that bulges toward the back surface side is integrally formed on the outer peripheral edge portion of the back plate 11. The outer peripheral edge portion of the back plate 11 is formed such that a portion extending from the front surface to the outer edge bulging portion 27 on the back surface side forms a continuous curved surface. Note that the end edge on the opening side of the locking groove 15 that is the tension member support part protrudes more greatly on the back side of the back plate 11 than the outer edge bulge part 27. Further, the above-mentioned reinforcing rib 17 formed on the back surfaces of the left and right side portions of the back plate 11 has end surfaces on the back surface side of the protruding end of the outer wall portion 15 b of the locking groove 15 and the outer edge bulging portion 27. The protruding height changes so as to connect the top part on the back side in a straight line.

FIG. 6 is an enlarged view showing a cross section of the outer peripheral edge portion of the back plate 11, and FIG. 7 is a perspective view showing the outer peripheral edge portion on the front side of the back plate 11.
As shown in these drawings, a plurality of minute (about 1 mm) convex portions 28 for locking the cushion material 12 on the back side of the tension member 13 are formed on the outer peripheral edge portion of the back plate 11. In the case of this embodiment, the convex portion 28 is formed in a substantially conical shape with a slightly rounded tip, and protrudes in a direction substantially perpendicular to the surface direction of the back plate 11. Specifically, the protrusions 28 are arranged in a plurality of rows in a zigzag manner along the winding direction of the upholstery material 13 in the front side region of the outer peripheral edge of the back plate 11 and the region facing the back plate back side of the outer edge bulge 27. It is formed in a shape. In the case of this embodiment, the convex portion 28 is formed in the vicinity of the top portion of the curved portion from the front surface to the back surface side of the outer peripheral edge portion of the back plate 11 from the viewpoint of facilitating the molding of the back plate 11. Although not provided, the convex portion 28 may be formed near the top portion.

  By the way, in this embodiment, the outer shape of the cushion material 12 is formed larger than the outer shape of the back plate 11, and is formed to have substantially the same size as the outer shape of the tension member 13. However, the cushion material 12 bonded to the back surface of the tension member 13 is not uniform in thickness throughout the entire area, and only the region bonded in the vicinity of the end of the peripheral edge portion 13a of the tension material 13 is formed thin as described above. As for the convex part 28 formed in the outer periphery part of the backplate 11, the tension material 13 is attached to the front side of the backplate 11, and the peripheral part 13a is drawn in to the back surface side of the backplate 11, and the backplate 11 When locked on the back surface, it bites into the thick portion of the cushion material 12 crushed by the tension member 13 and locks the back surface of the cushion material 12.

  Actually, when attaching the upholstery material 13 together with the cushioning material 12 to the back plate 11, the upholstery material 13 is put on the front side of the back plate 11 together with the cushioning material 12, and the periphery of the upholstery material 13 and the cushioning material 12 in that state. The end portion is folded back to the back side of the outer peripheral edge portion of the back plate 11, the end of the peripheral edge portion 13 a of the tension member 13 is pulled inward, and each edge member 20 is locked and fixed to the corresponding portion of the locking groove 15. Thus, when the peripheral edge portion 13a of the upholstery material 13 is drawn inward and locked to the back surface of the back plate 11, the upholstery material 13 is pressed against the outer peripheral edge portion of the back plate 11, and the corresponding portion of the cushion material 12 is removed. Crush. At this time, the plurality of convex portions 28 on the outer peripheral edge portion of the back plate 11 bite into the cushion material 12 and regulate the sliding of the cushion material 12.

  As described above, the chair 1 according to this embodiment is provided with the convex portion 28 that protrudes in the direction intersecting the surface direction of the back plate 11 and locks the back surface of the cushion material 12 on the outer peripheral edge portion of the back plate 11. Therefore, slippage in the direction along the pull-in direction of the cushioning material 12 at the outer peripheral edge of the back plate 11 is regulated by the convex portion 28, and the positional displacement of the tensioning material 13 triggered by slight slipping of the cushioning material 12 Can be prevented in advance.

  In particular, in the chair 1 of this embodiment, since a plurality of convex portions 28 are provided on the outer peripheral edge portion of the back plate 11 along the pull-in direction of the upholstery material 13, the pull-in force is applied from the back side of the back plate 11. The positional deviation of the tension member 13 to be received can be more advantageously suppressed.

  Further, in the chair 1 of this embodiment, the cushion material 12 is formed to have a larger outer dimension than the back plate 11, and the outer peripheral edge of the chair 1 is wrapped around the outer peripheral edge of the back plate 11 and folded back. Since the plurality of convex portions 28 are provided in a range that wraps around from the front surface side to the back surface side of the outer peripheral edge portion, the slip along the wraparound direction of the cushion material 12 can be advantageously regulated in a wide range. Moreover, since the cushioning material 12 gives a support reaction force to the tension member 13 from the inner side in a range from the front side to the rear side of the outer peripheral edge of the back plate 11, the positional deviation of the tension material 13 is made stronger. Can be regulated.

  In the case of the chair 1 of this embodiment, an outer edge bulging portion 27 that bulges toward the back side is provided on the outer peripheral edge of the back plate 11, and a convex portion 28 is provided on the outer edge bulging portion 27. At the same time, since the locking groove 15 for locking the end of the peripheral edge of the tension member 13 is provided in the inner region of the outer edge bulging portion 27 on the back surface side of the back plate 11, the cushion material 12 is provided on the back plate 11. A wide range from the front surface of the outer peripheral edge portion to the outer edge bulge portion 27 on the back surface side is largely wrapped, and in this state, the slip of the cushion material 12 can be efficiently regulated by the convex portion 28 of the outer edge bulge portion 27. And in the case of this chair 1, since it is set as the structure which draws in the terminal part of the tension | tensile_strength material 13 inside by the latching groove | channel 15 part inside the outer edge bulging part 27, the cushion material which wraps the outer peripheral part of the backplate 11 12 can be strongly attached to the outer end surface of the back plate 11. For this reason, the position shift of the direction along the drawing-in direction of the cushion material 12 or the tension material 13 can be controlled more reliably.

  In particular, in this embodiment, since the protruding end of the locking groove 15 which is a tension material support part protrudes largely to the back surface side of the back plate 11 rather than the outer edge bulge part 27, the peripheral edge part of the tension material 13 is the outer edge. It is not pushed into the back side of the bulging part 27 (back side on the inner side in the radial direction), and the cushion material 12 is not strongly folded at the outer edge bulging part 27. Therefore, the cushion material 12 is strongly crushed by the outer edge bulging portion 27, and a large reaction force in the direction away from the outer edge bulging portion 27 is prevented from acting on the tension member 13 folded back on the back side of the back plate 11. Thus, the tension member 13 is strongly pressed against the front side of the outer peripheral edge of the back plate 11. For this reason, while being able to maintain the tension | tensile_strength of the tension material 13 in the front surface side of the backplate 11 sufficiently high, the position shift of the tension material 13 can also be prevented more reliably.

  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 substantially cylindrical convex portion 28 is formed in the front side region of the outer peripheral edge portion of the back plate 11 and the region facing the back plate back side of the outer edge bulging portion 27. As shown in the embodiment shown in FIG. 8, the convex portions 28 </ b> A formed on the front side region of the outer peripheral edge portion of the back plate 11 and the back plate rear side of the outer edge bulge portion 27 face outward in the backrest width direction. May be formed in a substantially triangular shape along the die-cutting direction (vertical direction in the figure) during molding. In the case of this embodiment, when the tension member 13 is pulled by receiving a load from the front center side of the back plate 11, the tip of the convex portion 28 </ b> A is easily caught by the cushion material 12, and in particular, the outer edge bulging portion 27. When the convex portion 28A projecting on the back side of the back plate is formed as described above, the tip of the convex portion 28A regulates the displacement of the cushion material 12 with respect to the outer surface of the outer edge bulging portion 27. Since it will incline, the front-end | tip part of 28 A of convex parts becomes easy to be hooked with the cushioning material 12. FIG. Therefore, it is more advantageous in restricting the positional deviation in the direction along the pull-in direction of the cushion material 12 and the tension material 13. Further, in the vicinity of the apex of the curved portion from the front surface to the back surface side of the outer peripheral edge portion of the back plate 11, it is also possible to form a convex portion if it is a parting position.

In the above embodiment, the convex portion 28 provided on the outer peripheral edge portion of the back plate 11 has a substantially conical shape. However, as in the embodiment shown in FIG. The protrusions may be formed by the protruding ridges 128.
Moreover, although said embodiment is embodiment which the backrest main body of a backrest part is a load support body, a load support body may be a seat .

10 Backrest body (load support)
11 Back plate ( substrate, base)
12 Cushion material 13 Upholstery material 13a Peripheral part 15 Locking groove (Tension material support part)
27 Outer edge bulge 28 Projection 128 Projection (convex)

Claims (4)

A substrate having a skeleton part and having a load receiving surface in an inner region on the surface side ;
A cushion member disposed at least on the surface side of the substrate,
Having at least said covering the outer surface and the portion relating to the outer peripheral edge of the substrate of the cushion material, and Zhang member periphery is supported drawn into folded inner circumference side to the rear side of the outer peripheral edge of the substrate, the In a chair with a load support,
Of the substrate, the surface of the outer peripheral edge portion positioned on the outer side than the load bearing surface, the convex portion for locking the cushion member projects Menjika direction crossing the plane direction, the substrate of the clad material A plurality of chairs are provided along the pull-in direction from the back side of the chair. The cushion member is formed in a larger outside dimension than the substrate, the outer peripheral edge portion is folded back on the back side of the outer peripheral edge of the substrate,
The convex portions, according to claim 1 in a range around to the back side from the surface of the outer peripheral edge of the substrate, wherein said a plurality provided along the pulling direction from the back surface side of the substrate of the stretched member The chair described in. The outer peripheral edge of the substrate is provided with an outer edge bulging portion that bulges toward the back surface side, and the outer edge bulging portion is provided with the convex portion,
The chair according to claim 2 , wherein a tension material support portion that supports a peripheral edge portion of the tension material is provided in an inner area of the outer edge bulge portion on the back surface side of the substrate . The chair according to claim 3 , wherein the upholstery support portion protrudes more toward the back side of the substrate than the outer edge bulge portion.

Images