JP2009112396A - Backrest device of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backrest device of a chair which is capable of preventing a back frame from damaging other furniture or breaking a stretching material. <P>SOLUTION: In the backrest device of a chair where a bag like stretching material 12 opening downward is stretched across a back frame (11) formed by coupling the upper ends of right and left side frames (14a) directing the vertical direction by an upper frame (14b) directing the right and left direction, The back frame 11 includes a back frame body 14 made of a hard material, and protection materials 15 and 15 softer than the back frame body 14 and attached to the outer surfaces of the side frames 14a and 14b in the back frame body 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair backrest device in which a back frame is covered with a bag-like upholstery material that opens downward.

  The chair backrest device as described above is described in, for example, Patent Documents 1 and 2, and is well known.

  The chair backrest device described in Patent Document 1 is formed in a U-shape facing downward in a front view formed by connecting upper ends of left and right side frames facing in the vertical direction with upper frames facing in the horizontal direction. In addition, the entire back frame is covered with an upholstery material made of a bag-like opening and a mesh or the like.

The backrest device described in Patent Document 2 includes an upper frame and a lower frame facing in the left-right direction, and left and right side frames facing in the up-down direction connecting the ends of both the upper and lower frames. A back frame made of a hard synthetic resin having a substantially square front shape is provided, and a mesh-like tension material is stretched on the front surface of the back frame.
European Patent Application No. 0922419 (FIGS. 3 to 6) JP 2006-110000 A

  In each of the conventional chair backrest devices described in Patent Document 1 and Patent Document 2, since the entire back frame is formed of a hard material, the tension material on the outside of the back frame and other fixtures When they are rubbed or bumped, other fixtures may be damaged or the upholstery material may be damaged.

  The present invention has been made in view of the above problems, and provides a backrest device for a chair that can prevent other furniture from being damaged or the upholstery material from being damaged by a back frame. The purpose is that.

According to the present invention, the above problem is solved as follows.
(1) The back of a chair formed by stretching a bag-like upholstery that opens downward on a back frame formed by connecting upper ends of left and right side frames facing up and down with an upper frame facing in the left and right direction. In the drooping device, the back frame includes a back frame body made of a hard material, and a protective material softer than the back frame body attached to the outer side surfaces of the both side frames of the back frame body. .

(2) In the above item (1), at least the outer surface of the connecting corner between the both side frames and the upper frame is covered by the inwardly bent portion provided continuously with the upper end of the protective material.

(3) In the above item (1) or (2), a concave groove facing in the longitudinal direction may be fitted to one of the opposing surfaces of the protective material and the back frame main body, and the other groove may be fitted to the concave groove. As described above, a ridge that complements it is provided.

(4) In any one of the above items (1) to (3), the portion of the back frame body to which the protective material is attached is recessed by the thickness of the protective material.

According to the first aspect of the present invention, since the protective material softer than the back frame body is attached to the outer surfaces of the left and right side frames in the back frame body, the back frame body outside of the portion where the protection material is attached Even if the upholstery material rubs against or collides with other fixtures, the upholstery material will not be damaged.
Even if the back frame collides with other fixtures, the protective material acts as a cushion and absorbs external force to reduce the impact force, so that other fixtures are not damaged.

  According to invention of Claim 2, since the outer surface of the connection corner | angular part of a both-sides frame and an upper frame is also covered with the protective material, it can prevent the damage of the tension material in the right-and-left corner part of the upper part of a backrest. it can.

  According to the third aspect of the present invention, the protective material can be positioned on the back frame main body and can be securely fixed without being used with screws or the like.

    According to the invention described in claim 4, since the back frame main body and the outer surface of the protective material are aligned on the same surface, the appearance is improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a chair to which the present invention is applied, FIG. 2 is a side view of the chair, and FIG. 3 is an exploded perspective view of a backrest.

  1 and 2, a chair 1 includes a leg body 4 including five leg rods 3 facing in a radial direction and having a caster 2 attached to a tip thereof, and a gas spring which is erected at the center and accommodated in the center. (Not shown) can be expanded and contracted, a supporting base 6 fixed to the upper end of the supporting pillar 5, a seat 7 attached to the upper part of the supporting base 6, and both ends of the supporting base 6 Against the urging force of the gas spring 9 attached between the rear end of the support base 6 and the rear part of the dorsal fin 8, which is attached to the upper part of the dorsal fin 8 with the front end pivotally attached and the back support 8. And a backrest 10 that can be tilted backward.

  The backrest 10 includes a back frame 11 and a bag-like upholstery material 12 that covers the entire surface except the lower end thereof and is open at the bottom.

  As shown in FIGS. 3 and 4, the pair of left and right dorsal fins 8, 8 that are spaced in parallel to each other face the front below the rear part of the seat body 7, and the front end side is pivotally attached to the support base 6, and the rear end side The seat 7 has a standing portion 8a that stands up in the rear upper direction, and is formed in an L-shape that is substantially forward-facing in a side view. The opposing surfaces of both standing parts 8a are connected by a connecting plate 13.

  The back frame 11 includes a back frame main body 14 formed of a hard synthetic resin material, and a pair of left and right protective members 15 formed of a material softer than the back frame main body 14 such as rubber, elastomer, soft plastic, etc. 15.

  The back frame main body 14 is composed of left and right side frames 14a and 14a facing in the up and down direction, an upper frame 14b facing in the left and right direction connecting the upper ends of both side frames 14a, and left and right side frames 14a and 14a. The lower frame 14c that is provided at the lower end and faces in the left-right direction is integrally formed in a substantially rectangular frame shape in a front view in which the lower portion is slightly narrow. Between the upper frame 14b and the lower frame 14c, an intermediate frame 14d that connects the vertical intermediate portions of the left and right side frames 14a and 14a and that faces the left and right is integrated with the side frames 14a and 14a. Is formed.

  The left and right side frames 14a and 14a are arranged such that an intermediate portion 16 (hereinafter referred to as a bent portion 16) near the lumbar portion of the seated person, that is, slightly below the central portion in the vertical direction protrudes forward in a side view. It is bent in a nearly square shape. The upper frame 14b and the lower frame 14c are gently curved in a backward convex arc shape.

As shown in FIGS. 3 and 4, the intermediate frame 14d is separated from the bent portions 16 of the left and right side frames 14a and 14a largely upwards, and is connected to a position relatively close to the upper frame 14b. Are formed in a plate shape having a predetermined width.
Further, as shown in the cross-sectional plan view of FIG. 5 (the attached parts attached to the intermediate frame 14d are not shown), the central portion in the left-right direction protrudes more backward than the left and right side frames 14a. Further, when the bag-like tension member 12 is put on the back frame 11 as will be described later, the front tension member 12a and the rear tension member 12 of the tension member 12 are curved. A large space is formed between the surfaces facing 12b.

A plurality of attachment holes 17 penetrating in the front-rear direction are provided in the center portion in the left-right direction of the intermediate frame 14d so that an optional member can be attached.
The optional member is, for example, a nameplate or a hanger. In this embodiment, a nameplate 18 is attached. That is, the nameplate 18 is inserted into the mounting hole 19 provided in the plate 18 and the mounting hole 17 of the intermediate frame 14d, and is inserted into the screw hole (not shown) of the mounting plate 20 disposed on the front side of the intermediate frame 14d. Are attached to the rear surface of the intermediate frame 14d.

  As shown in FIG. 3, a rearwardly and downwardly recessed U-shaped recess 22 is formed in the lower center of the rear surface of the lower frame 14c. The upright portion 8a of the dorsal fin 8 is inserted through openings 25 and 26 provided in the center of the bottom plate 23 fixed to the bottom surface of the lower frame 14c with screws (not shown) and the backrest lower cover 24, respectively. 8a and the connecting plate 13 are inserted.

  The upright portions 8a and 8a and the connecting plate 13 inserted into the recess 22 are fixed to the rear surface of the lower frame 14c by screws (not shown) with the upright portions 8a and 8a and the connecting plate 13 interposed therebetween. It is fixed by. Thereby, the back frame 11 is fixed to the backpack 8. Note that after the attachment plate 28 is attached, the rear opening of the recess 22 is closed by the backrest rear cover 28.

  As shown in FIG. 3 to FIG. 5, on the outer surface from the connecting corner of the upper frame 14 b and the left and right side frames 14 a and 14 a in the back frame body 14 to the vicinity of the bent portion 16 of the side frame 14 a. The notch grooves 29 and 29 are formed in the vertical direction. On the outer side surfaces of both the notch grooves 29 and 29, the ridges 30 whose front side slightly protrudes outward are integrated in the longitudinal direction. Is formed.

  The left and right protective members 15, 15 are fitted in the cutout concave groove 29 to have a vertical dimension that can cover the same, and the front-rear dimension is substantially the same as the front-rear dimension of the outer portion of the side frame 14 a. A concave groove 31 is formed on the inner surface in the longitudinal direction.

  As shown in FIGS. 5 and 6, the ridges 30 of the side frame 14 b and the concave grooves 31 of the protective material 15 have shapes complementary to each other so that they are closely fitted. . It should be noted that the amount of recess of the notch groove 29 provided in the portion of the back frame main body 14 where the protection material 15 is attached is substantially equal to the thickness of the protection material 15, and when the protection material 15 is fitted into the notch recess groove 29. The back frame main body 14 and the outer surface of the protective material 15 are aligned with each other.

  The groove 30 formed in the left and right protective members 15 and 15 is fitted to the ridges 30 formed on the both side frames 14a and 14a of the back frame main body 14 while elastically deforming the protective member 15 in an outward opening shape. By doing so, both the protective members 15 are attached to both side surfaces of the back frame main body 14.

  The upholstery material 12 is made of a woven or woven synthetic fiber having high tension and elasticity, such as polyamide fiber or polypropylene fiber, and is formed in a bag shape having an open bottom. The dimensions of the upholstery material 12 are determined in advance so that an appropriate tension is applied to the upholstery material 12 when the upholstery material 12 is put on the back frame 11.

  The portion of the upholstery 12 that supports the back of the occupant, that is, the portion above the bent portion 16 of the side frame 14a, is a low-density portion 32 having a coarse mesh so as to have air permeability and translucency. In addition, the portion below the bent portion 16 that supports the vicinity of the waist of the seated person is a high-density portion with a finer mesh than the upper portion so that the attachment portion of the dorsal fin 8 in the lower frame 14c is less visible from the outside. 33.

  The tension member 12 is placed on the back frame 11 from above, and then the lower end portion is fixed to the lower surface of the bottom plate 23 attached to the lower end of the back frame main body 14 by tacking or the like and sandwiched by the backrest lower cover 24 The back frame 11 is stretched in a predetermined tension state.

As described above, when the low density portion 32 and the high density portion 33 are provided on the upper portion of the tension member 12 and the lower portion thereof, the upper tension of the front tension member 12a becomes smaller than the lower tension, and the front tension member 12a. The amount of deflection of the upper part of the rear is greater than the amount of deflection of the lower part.
As a result, the upper part of the front tension member 12a that supports the back of the seated person can be easily bent rearward, and the amount of bending of the lower part of the front tension member 12a that supports the vicinity of the waist is reduced, thereby providing a lumbar support function. As a result, a comfortable sitting comfort can be obtained.

After the tension material 12 is stretched, the upper frame 14b, the lower frame 14c, and the intermediate frame 14d are each gently curved in a convex arc shape in the rearward direction, so that the rear tension material 12b is projected rearward. It swells into a curved surface, and a large space is formed between the opposing surfaces of the front tension member 12a.
As a result, the amount of rearward bending of the front tension member 12a can be increased, and not only a comfortable sitting comfort can be obtained, but also the backrest 10 can have a sense of volume, and the appearance is good. .

  As described above, in the backrest 10 of the above-described embodiment, the outer side surfaces of the left and right side frames 14a and 14a in the back frame body 14 formed of a hard material, and the connecting corners of the upper frame 14b, Since the protective members 15 and 15 made of a softer material than the back frame body 14 are attached, the tension material 12 outside the back frame body 14 where the protective material 15 is attached rubs against or collides with other fixtures. The upholstery material 12 will not be damaged.

  Even if the back frame 11 hits another fixture, the protective material 15 acts as a cushion and absorbs external force to reduce the impact force, so that the fixture is not damaged.

In addition, in the said embodiment, although the protruding item | line 30 is provided in the back frame main body 14 side and the ditch | groove 31 is provided in the protective material 15 side, you may provide them reversely.
Further, the protective material 15 may be attached by screws or adhesion.

It is a front view of a chair provided with one embodiment of the present invention. Similarly, it is a side view of a chair. Similarly, it is an exploded perspective view of a backrest. Similarly, it is a center longitudinal cross-section enlarged side view of the backrest. FIG. 5 is an enlarged cross-sectional plan view of an essential part of the VV line of FIG. 4. FIG. 6 is an enlarged view of a VI part in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair 2 Caster 3 Leg rod 4 Leg body 5 Pillar 6 Support base 7 Seat body 8 Back rod 8a Standing part 9 Gas spring 10 Backrest 11 Back frame 12 Tension material 12a Front tension material 12b Rear tension material 13 Connection Plate 14 Back frame body 14a Side frame 14b Upper frame 14c Lower frame 14d Intermediate frame 15 Protective material 16 Intermediate part (bent part)
17 Mounting hole 18 Name plate 19 Mounting hole 20 Mounting plate 21 Mounting screw 22 Recess 23 Bottom plate 24 Backrest lower cover 25 Opening 26 Opening 27 Mounting plate 28 Backrest rear cover 29 Notch recess 30 Convex line 31 Concave groove 32 Low density part 33 High density part

Claims (4)

In a backrest device for a chair, in which a bag-like upholstery that opens downward is stretched on a back frame formed by connecting upper ends of left and right side frames facing up and down with an upper frame facing in the left and right direction ,
The back frame is provided with a back frame body made of a hard material and a protective material softer than the back frame body attached to the outer side surfaces of the both side frames of the back frame body. Chair backrest device.   2. The chair backrest device according to claim 1, wherein at least an outer surface of a connecting corner portion between both side frames and the upper frame is covered with an inwardly bent portion provided continuously with an upper end portion of the protective material.   A concave groove facing in the longitudinal direction is formed on one of the opposing surfaces of the protective material and the back frame main body, and a convex line is formed on the other side so as to be complemented with the concave groove so as to be fitted in the concave groove. The chair backrest device according to claim 1 or 2 provided. The backrest device for a chair according to any one of claims 1 to 3, wherein a portion of the back frame body to which the protective material is attached is recessed by the thickness of the protective material.

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