JP2009112359A - Backrest of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backrest of a chair which has excellent outside appearance by also covering right and left corners at the lower end of a back frame with stretching material. <P>SOLUTION: Fittings 17 which can be attached to both sides of the rear part of a seat body are secured to right and left ends of a horizontal rod 11a at the lower end of the frame-shaped back frame in such a way as to face forward. The lower part of the stretching material 14 stretched over a part of an upper frame 12 excluding the lower end, is stretched around the rear surface and lower surface of the horizontal rod 11a, and the front end of the stretching material in the stretched state is fastened to the upper faces of the right and left fittings 17 with screws. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a backrest of a chair formed by stretching a flexible upholstery material on a back frame.

As a backrest of this type of chair, for example, there are those described in Patent Documents 1 and 2.
European Patent Application No. 0922419 JP 2003-135200 A

  In the backrests of chairs described in Patent Documents 1 and 2 above, a bag-like upholstery that opens downward is covered with a back frame from above, and the lower end of the upholstery is simply pulled down. Because it is only fixed to the lower surface of the horizontal frame at the lower end of the back frame, the corners of the lower left and right sides of the back frame cannot be covered with the upholstery material, and the frame of that part is greatly exposed There is a problem that the appearance is bad.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a chair with a good appearance by covering both the left and right corners of the lower end of the back frame with a tension material. Yes.

According to the present invention, the above problem is solved as follows.
(1) At the left and right ends of the lower end of the frame-shaped back frame, mounting members that can be attached to both sides of the rear of the seat are fixed so as to face the front, and on the portion excluding the lower end of the back frame The lower part of the stretched tension member is hung around the rear surface and the lower surface of the horizontal rail, and the front end portion is fixed to the rear portions of the left and right attachment members or the seat body in a tension state.

(2) The left and right corners of the lower end of the back frame are covered from the outside by the lower part of the upholstery material.

(3) In the above item (1) or (2), the back frame is a front-view upward-facing core that has a pair of left and right lower side heels in the upper frame that is U-shaped in the front-view downward direction and a horizontal heel. A front view in which the upper ends of a pair of left and right upper side ridges in a lower frame in a letter shape are connected to each other, and a part of the left and right lower ends are opened at the outer peripheral edge excluding the lower end portion of the upholstery material A downward U-shaped bag-shaped portion is provided, and this bag-shaped portion is inserted into the upper frame.

(4) In the above item (3), a bag-like portion facing in the left-right direction with both side ends opened is also provided on the lower edge of the upholstery material, and both ends of the fixing plate inserted through the bag-like portion are Screw onto the mounting member.

(5) In the above item (1), the upholstery material is shaped like a bag having an opening at the bottom.

  According to the first aspect of the present invention, the lower part of the tension member stretched on the back frame is hung around the rear and lower surfaces of the horizontal frame at the lower end of the back frame, and the front end is fixed to the left and right mounting members or the rear of the seat. Therefore, when the tension member is pulled forward, the left and right corners of the lower end of the back frame can be covered from the outside by the lower part.

  According to the second aspect of the present invention, the left and right corners of the lower end portion of the back frame are actively covered from the outside by the lower part of the upholstery material, so that the portion is prevented from being exposed. Appearance is improved.

  According to the invention described in claim 3, since the upholstery material can be formed by one sheet, the material cost is saved and the cost can be reduced.

  According to the invention described in claim 4, it is possible to easily and firmly fix the left and right attachment members while pulling the lower end portion of the tension member evenly by the fixing plate.

  According to the fifth aspect of the invention, the tensioning work for the back frame can be easily performed from above, and the replacement is easy.

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

The leg 1 of the chair has five legs 2 that have gas springs (not shown) for height adjustment accommodated therein, and that are fixed to the upper outer peripheral surface thereof and that have casters 3 at the front end thereof and that face in the radial direction. The seat body 6 is attached to the upper part of the support base 5 attached to the upper part of the pedestal 2.
The seat body 6 is composed of a seat plate 7 made of synthetic resin and a cushion material 8 attached to the upper surface of the seat plate 6, and armrests 9, 9 whose upper ends are bent outward are formed on both side edges of the seat plate 7. It is connected continuously.

The backrest 10 includes a back frame 13 including a lower frame 11 and an upper frame 12, and a tension member 14 stretched on the back frame 13.
The lower frame 11 is formed by bending a metal pipe into a U-shape upward when viewed from the front, so that short upper side bars 11b and 11b are connected to both ends of the horizontal bar 11a. Connecting rods 15 and 15 having a smaller diameter are fitted to the opposite side flange 11b so as to protrude upward, and set screws (not shown) inserted through upper and lower mounting holes 16 on the front surface of the upward side flange 11b. ).

  A pair of left and right mounting brackets which are attached to the lower surfaces of both sides of the rear end portion of the seat plate 7 and are L-shaped inward when viewed from the front, on the front surface of the connecting corner portion of the horizontal rod 11a and the upward side rod 11b. The rear ends of 17 and 17 are fixed by welding so as to face forward.

  The upper frame 12 bends a metal pipe having the same outer diameter as that of the lower frame 11 in a downward U shape so that the lower part is slightly outwardly opened when viewed from the front, and is slightly more than the central part in the vertical direction. It is formed by bending so that the lower part protrudes forward so as to form a substantially square shape when viewed from the side, and the lower ends of the left and right downward side rods 12a, 12a are connected to the left and right connecting rods 15 of the lower frame 11, respectively. , 15, and the set screw 19 inserted from the mounting hole 18 provided in the inner surface of the lower end portion of the downward-side flange 12a is screwed into the female screw hole 20 on the inner surface of the connecting rod 15 and fixed. A back frame 13 having a rectangular frame shape when viewed from the front is formed.

  The upholstery material 14 is formed into a rectangular shape by knitting or weaving synthetic fibers having high tensile strength and appropriate stretchability, such as polyamide fiber or polyester fiber, into a single mesh shape. The left and right dimensions before stretching are smaller than the left and right dimensions of the back frame 13, and the vertical dimension is longer than that of the back frame 13.

The left and right dimensions of the lower end portion of the upholstery material 14 are gradually reduced downward by obliquely cutting out both corners of the lower end portion.
A bag-like portion 21 facing in the left-right direction and a downward U-shaped bag-like portion 22 inserted through the upper frame 12 are respectively provided on the lower edge of the upholstery material 14 and the outer peripheral edge excluding the lower end portion. And are formed.

The upper half portion of the upholstery material 14 surrounded by the bag-like portion 22, that is, the portion located above the square-shaped bent portion of the downward-facing side collar 12a that supports the back of the seated person, has a coarse mesh. The low density portion 23 is used.
In addition, the lower part of the upholstery material 14 located below the bent part of the downward-side saddle 12a, that is, the part that supports the vicinity of the waist of the seated person, a plurality of high density finer than the mesh of the upper half. The portions 24 and a plurality of low density portions 23 having the same roughness as the meshes of the upper half mesh are formed in a band shape alternately in the vertical direction and in the horizontal direction.
The roughness of the mesh of the lower end part of the upholstery material 14 and the bag-like parts 21 and 22 is set to a high density in order to ensure the tensile strength.

Next, the assembly procedure of the backrest 10 will be described with reference to FIGS.
Before connecting the lower frame 11 and the upper frame 12, first, the tension member 14 is temporarily attached to the upper frame 12 as follows.
As shown in FIG. 3, slit-like openings 25, 25 facing in the vertical direction are formed on the inner front surfaces of the left and right lower ends of the bag-like portion 22 on the outer peripheral edge of the upholstery material 14, as shown in FIG. 4. As described above, while inserting the end portion of either the left or right downward side rod 12a from either one of the openings 25, and pulling the entire tension material 14 toward the other downward side rod 12a, the downward side rod The end of 12 a is projected from the other opening 24. At this time, since the left and right dimensions of the upholstery material 14 are smaller than the left and right dimensions of the upper frame 12, the tension material 14 is pulled in the left and right directions to apply tension.

  Next, the lower end portions of the left and right downward side rods 12a are fitted and fixed to the connecting rods 15 of the lower frame 12 in the manner described above, and the lower frame 11 and the upper frame 12 are connected.

  Next, a fixing plate 26 facing in the left-right direction is inserted into the bag-like portion 21 at the lower edge of the upholstery material 14, and the front surface of the lower end portion of the upholstery material 14 is placed on the lower frame 11 while strongly pulling the fixing plate 26 downward. After hanging around the back surface and the bottom surface of the recumbent rod 11a and pulling the fixing plate 26 forward together with the tension member 14 with the recumbent rod 11a as a fulcrum, both ends of the fixing plate 26 are connected to the upper surfaces of the left and right mounting brackets 17 and 17, respectively. Put it on. In this state, as shown in FIG. 5, set screws 28, 28 inserted into through holes 27, 27 provided at the left and right projecting ends of the fixing plate 26 are attached to the inward pieces 17 a of the left and right mounting brackets 17, 17. For installation, it is screwed into the screw hole 29 and tightened.

Thus, the assembly of the backrest 10 is completed, and the upholstery material 14 is stretched on the back frame 13 with a predetermined tension state.
After the backrest 10 is assembled, both the inwardly facing pieces 17a and 17a are drilled in the state in which the left and right mounting brackets 17 and 17 are inserted between the opposing surfaces of the seat body 6 adjacent to the left and right armrests 9 and 9, respectively. The backrest 10 is attached to the seat body 6 by being fixed to the upper surfaces of both sides of the rear end portion of the seat plate 7 by screws (not shown) inserted in the two front and rear mounting holes 30, 30. In addition, after attaching the backrest 10, the cushion material 8 is attached to the upper surface of the seat plate 7 so as to cover the upper surfaces of the left and right inwardly facing pieces 17a and the horizontal ribs 11a.

  As described above, in the backrest of the above embodiment, the bag-like portion 22 on the outer peripheral edge of the upholstery material 14 is inserted into the upper frame 12, and the lower end portion of the upholstery material 14 is connected to the lower frame of the back frame 13. As shown in FIGS. 1 and 5, the front end is fixed to the mounting bracket 17 for mounting the seat plate 7 while pulling forward so as to hang around the rear surface and the lower surface of the ladle 11 a of 11. When pulling the lower part of the upholstery material 14 forward, the left and right corners of the lower end of the back frame 13 can be easily covered with the lower part of the upholstery material 14.

Further, the outer side surfaces of the left and right mounting brackets 17 are covered with both armrests 9 and the reeds 11a are covered with the cushioning material 8, respectively, and are not exposed to the outside.
Furthermore, the upper half of the upholstery material 14 that supports the back is a fine low-density portion 23 of the mesh, and the lower portion of the upholstery material 14 that supports the vicinity of the waist is finer than the mesh of the upper half of the upholstery material 14. Since the high-density portions 24 and the low-density portions 23 having the same roughness as the meshes of the upper half are alternately formed in the vertical direction, the bending rigidity of the upper half of the upholstery material 14 is lower. Therefore, it will bend backward greatly with a small load compared to the lower part.
Accordingly, the amount of bending of the upper half and the lower portion of the upholstery material 14 can be appropriately different from each other. For example, when the lower portion of the upholstery material 14 is set to a small amount of bending so as to have a lumbar support function. However, since the amount of bending of the upper half of the upholstery material 14 can be increased, a comfortable sitting comfort can be obtained.

  In the above embodiment, the bag-like portion 21 at the lower edge of the upholstery material 14 is fixed to the upper surfaces of the left and right mounting brackets 17 by the fixing plate 26. However, the bag-like portion 21 is provided or the fixing plate 26 is Without using, you may fix the lower end part of the upholstery material 14 directly to the lower surface of the rear-end part of the seat board 7 by tacking.

  In the above-described embodiment, the upholstery material 14 is stretched by inserting the downward U-shaped bag-like portion 22 formed on the outer peripheral edge thereof into the upper frame 12. May be formed in a bag shape that is open and covered with the back frame 13 from above. In this way, the upholstery material 14 can be easily stretched from above on the frame-like back frame 13 and can be easily replaced. Also in this case, the lower end portion of the upholstery material 14 may be fixed to the lower surface of the rear end portion of the seat plate 7 by tacking or the like as described above.

  In the above embodiment, the low density portions 23 and the high density portions 24 are alternately formed in the vertical direction so that the amount of bending of the lower portion of the upholstery material 14 can be adjusted. It is good.

It is a perspective view of one embodiment of the backrest of the chair of the present invention. Similarly, it is a front view. Similarly, it is an exploded perspective view of a backrest. Similarly, it shows the assembling procedure of the backrest, and is a perspective view of a state in which the upholstery is temporarily attached to the back frame. Similarly, it is the perspective view after the end of the assembly of the backrest.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg 2 Pillar 3 Caster 4 Leg ridge 5 Support base 6 Seat body 7 Seat board 8 Cushion material 9 Armrest 10 Backrest 11 Lower frame 11a Recliner 11b Upward side ridge 12 Upper frame 12a Downward side ridge 13 Back frame 14 Tension material 15 Connecting rod 16 Mounting hole 17 Mounting bracket (Mounting member)
17a inward piece 18 mounting hole 19 set screw 20 female screw hole 21 bag-like part 22 bag-like part 23 low-density part 24 high-density part 25 opening 26 fixing plate 27 through-hole 28 set screw 29 female screw hole 30 mounting hole

Claims (5)

  Attachment members that can be attached to both sides of the rear portion of the seat body are fixed to the left and right ends of the lower end portion of the frame-shaped back frame so as to face forward, and are stretched on the portion excluding the lower end portion of the back frame. A backrest of a chair, wherein a lower part of the upholstery member is hung around the rear and lower surfaces of the reed and the front end is fixed to the left and right attachment members or the rear part of the seat body in a tension state.   The backrest of the chair according to claim 1, wherein the left and right corners of the lower end of the back frame are covered from the outside by the lower part of the upholstery material.   The back frame has a pair of left and right lower side lower ends of the upper frame that is U-shaped downward in the front view, and a pair of left and right upward sides in the lower frame that has a horizontal shape and has an upward U-shape. The upper end of the bag is connected to each other, and a U-shaped bag-like portion facing downward from the front is provided on the outer peripheral edge excluding the lower end portion of the upholstery material. The backrest of the chair according to claim 1 or 2, wherein the shape portion is inserted into the upper frame.   A bag-like portion facing in the left-right direction with both side ends opened is also provided on the lower edge of the upholstery material, and both ends of the fixing plate inserted through the bag-like portion are screwed to the left and right mounting members. 3. The backrest of the chair described in 3. The backrest of the chair according to claim 1, wherein the upholstery is formed in a bag shape having an opening at the bottom.

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