JP5503356B2 - Chair - Google Patents

Description

  The present invention relates to a chair that is fixedly installed on a floor surface in a lecture room of a school, for example.

  Among such chairs, there are those in which the backrest is formed only by the back plate (for example, see Patent Document 1), and those in which a thin cushion material is attached to the front surface of the back plate (for example, see Patent Document 2). .

Japanese Patent No. 2927712 JP 2004-135817 A

In the chairs described in Patent Documents 1 and 2, since the cushioning property of the backrest is poor, it is difficult to bend backward and there is no air permeability, so that a comfortable sitting comfort cannot be obtained.
In addition, when the chair is rotated to the front unused position, the backrest tilts forward and a part of the top plate of the desk is covered with the non-translucent backrest. A shadow is cast on the top surface and it becomes dark.

In order to cope with this problem, it is conceivable to stretch a mesh-like tension material having stretchability, breathability and translucency on a frame-like back frame.
However, if a tension member is stretched on the backrest of the chair described in the above-mentioned patent document, when the chair tilted forward to the non-use position is turned to the use position at the rear and seated, the seat's buttocks are stretched. When the person hits the front of the material and is damaged by rubbing, or when a person passes behind the chair that is tilted forward to the unused position, the object hits the upholstery under the backrest, etc. It may damage the upholstery material.
In such a case, it is necessary to replace the damaged upholstery material, but how to easily perform the upholstery operation of the upholstery material on the back frame becomes a problem.

  In addition, when the chair is tilted forward to a non-use position, the attachment part to the seat at the lower end of the backrest and the lower part of the upholstery material stretched on the back frame protrude rearwardly and are unsightly. Since there is a concern that it will become a problem, how to cover the lower part of the attachment part and the tension material is also a problem.

  The present invention has been made in view of the above problems, and has a mesh-like tension material stretched on the back frame to improve the sitting comfort and facilitate the replacement work of the tension material. It is an object of the present invention to provide a chair that covers the lower part of the tension member stretched on the back frame and the attachment portion of the lower part of the back frame in a good manner and can prevent the lower part of the tension member from being damaged.

According to the present invention, the above-mentioned problems are solved as follows.
(1) In a chair comprising a seat frame supported by legs and a back frame with a lower part attached to the rear part thereof, the back frame is formed into a frame shape, and the back frame is formed into a mesh shape. A bag-like tension member that is knitted and opened at the bottom is stretched over from above, and attachment portions provided at the lower portions of the left and right side bars of the back frame are provided on the upper surfaces of both side portions of the rear portion of the seat frame. A cover piece that can be detachably attached and can cover the left and right attachment parts and the lower part of the back frame on which the upholstery material is stretched on the rear edge and rear side edges of the seat frame from the rear and both sides. Is set up.

With such a configuration, the back frame of the backrest is made into a frame shape, and a mesh-like tension material is stretched on the back frame, so that the tension material is easily bent backward when leaning on the backrest, Moreover, since it has air permeability, a comfortable sitting comfort can be obtained.
Further, since the upholstery is formed in a bag shape having an opening at the bottom and is stretched by covering the back frame from above, the replacement work is easy.
Furthermore, the attachment part provided in the lower part of the left and right side lamps in the back frame and the lower part of the back frame in which the upholstery material is stretched are covered with the cover pieces from the rear and both sides, so the appearance is good. In addition, the lower part of the upholstery can be prevented from being damaged.

(2) In the above item (1), the inner surface of the left and right rear corners of the cover piece is provided with a concave groove facing in the vertical direction that is recessed outward in a semicircular shape in plan view. The lower part of the left and right side lamps in the frame and the upholstery material stretched on that part are fitted.

  With such a configuration, the lower part of the left and right side lamps in the back frame and the upholstery material stretched on that part are fitted into the concave grooves provided in the inner surfaces of the left and right rear corners of the cover piece, thereby Since the back frame is positioned in the front / rear / left / right direction with respect to the frame and the back frame is prevented from being displaced in the front / rear / left / right direction, the lower portion of the back frame can be easily attached to the seat frame.

(3) In the above item (2), the vertical dimension of the rear corner of the cover piece is made larger than the vertical dimension of the cover pieces on the rear and both sides.

With such a configuration, the lower end portion of the back frame is stably held by the rear corner portion of the cover piece having a large vertical dimension in the seat frame.
In addition, since the backward and lateral loads applied to the back frame are received by the rear corners having a large vertical dimension, these loads are directly applied as bending loads to the mounting portions of the left and right side lamps. There is nothing.

(4) In any one of the above items (1) to (3), the left and right mounting portions of the back frame are directed in the front-rear direction, and the rear ends are fixed to the front surfaces of the lower end portions of both sides. L-shaped brackets are used, and the inwardly facing pieces of both brackets are detachably fixed to the upper surfaces of both side portions of the rear portion of the seat frame with screws.

  With such a configuration, the left and right mounting portions of the back frame are L-shaped brackets that face in the front-rear direction and the rear ends are fixed to the front surfaces of the lower end portions of the both side ridges. Since the inwardly facing pieces are fixed to the upper surface of both sides of the rear part of the seat frame with screws, the attachment strength to the seat frame at the lower end of the backrest is increased, and assembly and removal work to the seat frame Becomes easy.

According to the present invention, the back frame of the backrest is formed into a frame shape, and the mesh-like upholstery material is stretched on the back frame. A comfortable sitting experience.
Further, the upholstery is formed in a bag shape having an opening at the bottom, and is stretched by covering the back frame from above, so that the replacement work is facilitated.
Furthermore, the attachment part provided in the lower part of the left and right side lamps in the back frame, and the lower part of the back frame on which the tension material is stretched are covered with the cover pieces from the back and both sides, so the appearance is good. In addition, the lower part of the upholstery can be prevented from being damaged.

It is a figure of one Embodiment of the chair of this invention. Similarly, it is a front view. Similarly, it is the perspective view seen from diagonally forward. Similarly, it is an exploded perspective view. It is a perspective view of the state which attached the backrest to the seat frame. FIG. 4 is an enlarged vertical side view taken along line VI-VI in FIG. 2. Similarly, it is the VII-VII line expansion vertical side view of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is a side view of a chair 1 of the present invention installed in a school lecture room, etc. FIG. 2 is a front view of the same, FIG. 3 is a perspective view of the same viewed obliquely from the front, and FIG. In the perspective view, the chair 1 is fixed to the floor F between the desks 2 arranged at regular intervals in the front-rear direction (hereinafter, the left side of FIG. 1 will be described as the front) fixed to the floor F. Used.

The chair 1 is attached to a base 3 fixed to the floor F, a leg column 4 comprising a square tube pivotally attached to the base 3 so that a lower end portion thereof is pivotable in the front-rear direction, and an upper end portion of the leg column 4 And a backrest 6 attached to the rear end of the seat 5.
In the chair 1, as shown by a solid line in FIG. 1, the use position where the pedestal 4 tilts slightly backward, and as shown by a two-dot chain line, the front of the backrest 6 is close to the rear end of the top plate 7 of the desk 2. It can be rotated back and forth around the base 3 to a non-use position that tilts forward to a position where it moves.

  As shown in FIG. 4, the backrest 6 covers a square frame-shaped back frame 9 made of a pipe whose lower end faces are connected by a pipe-shaped lower side ridge 8 and covers the entire back frame 9. It consists of a bag-like upholstery material 10 which is covered from above and whose lower end is opened. The upholstery material 10 is formed by weaving or knitting moderately stretchable synthetic fibers in a mesh shape so as to have translucency and breathability, and closes the opening at the lower end opening. A fastener (not shown) is sewn.

  The middle part of the left and right side rods 9a, 9a in the back frame 9 is bent in the shape of a square when viewed from the side, and the upper horizontal rod 9b connected to the upper end of the both side rods 9a and the lower horizontal rod 8 are It is curved so as to bulge backward in an arc shape.

  On the front surfaces of the lower ends of the left and right side rods 9a, 9a, mounting brackets 11, 11 having an inward L-shape consisting of an inward piece 11a and a vertical piece 11b are arranged at the rear ends of the vertical pieces 11b. By welding, they are fixed in an opposing manner. The front and rear nuts 12, 12 are fixed to the upper surface of the inward piece 11a by welding so as to communicate with front and rear through holes (not shown) drilled in the inward piece 11a.

  The seat 5 includes a seat frame 13 made of a die-cast product such as an aluminum alloy, and a seat plate 15 attached to the upper surface and covered with a cushion material 14 on the upper surface.

  As shown in FIG. 4, the seat frame 13 has an upper surface curved slightly downward, and has an upward edge piece 16 on both the front edge and the left and right edges, and has a vertical dimension at the rear edge that is higher than the edge piece 16. A rectangular substrate 18 having a large rear cover piece 17 in the front-rear direction, and the rear half of the substrate 18 are integrally formed outward so as to be continuous with the left and right edge pieces 16 and the rear cover piece 17. In addition, a pair of left and right backrest mounting portions 19 and 19 are provided, and the lower surface of the substrate 18 is a smooth surface in order to improve the appearance from the rear when tilted forward to the unused position. Note that the vertical dimension of the rear cover piece 17 is such a length that the lower reed 8 of the back frame 9 is covered from the rear when the left and right mounting brackets 11 of the back frame 9 are attached to the left and right back support portions 19. ing.

  The left and right backrest mounting portions 19, 19 stand up from the support portion 19 a that receives and supports the inwardly-moving piece 11 a of the mounting bracket 11 and the lower end of the side rod 9 a and the front and outer edges thereof, and the rear edge is the substrate 18. The side cover piece 19b includes a rear cover piece 17 and a continuous side cover piece 19b. The side cover piece 19b has a vertical dimension that can cover the outer side of the mounting bracket 11 and the outer side and the rear side of the lower end of the side flange 9a. is there.

  The vertical dimension of the rear corner 19c in which the rear cover piece 17 and the left and right side cover pieces 19b, 19b are continuous is made larger than the other parts, and both the rear corners 19c, 19c have a plan view outward. Fitting portions 22 and 22 each having an upper and lower recessed groove 21 recessed in an arc shape on the inner surface are formed to bulge outward in an arc shape. In these left and right concave grooves 21, the lower ends of the left and right side bars 9 a, 9 a in the back frame 9 and the outer peripheral surface of the upholstery material 10 stretched on that portion are fitted from above. Yes.

The substrate 18 of the seat frame 13 is fixed to the upper end of the pedestal 4 as follows.
As shown in the enlarged cross-sectional views of FIGS. 4 and 6, a square pedestal attached to the central portion of the board 18 slightly forward is inclined to the rear and downward, with the upper part being higher than the upper surface of the board 18 and the rear part being lower. A portion 23 is formed, and a rectangular protrusion 23 a that is fitted to the upper end portion of the pedestal 4 is protruded from the lower surface of the pedestal mounting portion 23.

A mounting plate 25 having two front and rear female screw holes 24, 24 is fixed to the inner surface of the upper end portion of the pedestal 4 by welding.
The protrusion 23a of the pedestal mounting part 23 is fitted to the upper end of the pedestal 4 and inserted into the two front and rear through holes 26, 26 provided in the pedestal mounting part 23 with the axis inclined backward. The lower surface of the seat frame 13 is fixed to the upper end portion of the pedestal 4 by screwing the bolts 27 and 27 into the female screw holes 24 and 24 of the mounting plate 25 and tightening them.

Next, the procedure for assembling the seat 5 and the backrest 6 will be described.
First, the back frame 9 is covered with the upholstery material 10 from above, and while pulling downward, the opening at the lower end of the upholstery material 10 is closed with a fastener immediately below the lower side ridge 8 so that the upholstery material 10 is attached to the frame-like back. It is stretched on the frame 9. As shown in FIG. 4, upward slits 28 and 28 into which the base ends of the vertical pieces 11 b of the left and right mounting brackets 11 are formed on both sides of the lower end portion of the upholstery material 10. The lower end portion is set to be positioned directly below the lower reed ridge 8 without difficulty.

Next, as shown in FIG. 5, the back frame 9 on which the upholstery material 10 is stretched is attached to the left and right backrest mounting portions 19, 19 of the seat frame 13 as follows.
That is, as shown also in FIG. 7, the groove of the fitting portion 22 provided at the rear corner portion 19 c of the left and right backrest mounting portions 19, 19 at the lower end portions of the left and right side saddles 9 a, 9 a of the back frame 9. The inwardly facing pieces 11 a, 11 a of the left and right mounting brackets 11, 11 are placed on the upper surface of the support portion 19 a of the backrest mounting portion 19 while being fitted to 21 from above. At this time, since the lower end portions of the left and right side rods 9a, 9a are fitted and positioned in the concave grooves 21 of the left and right fitting portions 22, the back frame 9 is displaced in the front-rear and left-right directions with respect to the seat frame 13. Is prevented.

  Next, as shown in FIG. 7, the bolts 30, 30 inserted from below into the two front and rear mounting holes 29, 29 provided in the support portions 19 a of the left and right backrest mounting portions 19, 19 are attached to the left and right mounting brackets 11. , 11 are screwed onto the nuts 12 and 12 welded to the upper surfaces of the inwardly facing pieces 11a and 11a and tightened.

Thus, as described above, the side of the vertical piece 11b of the left and right mounting brackets 11, 11 and the lower ends of the left and right side rods 9a, 9a and both sides of the lower end of the upholstery material 10 stretched thereon However, the side cover pieces 19b, 19b are covered with appearance, and the lower side ridge 8 and the rear of the lower end of the upholstery material 10 stretched so as to cover it are also covered with the rear cover piece 17 in appearance.
Further, a side cover piece 19b and a rear cover piece 17 are formed by a tension member 10 stretched on the lower ends of the side rods 9a and 9a and a lower end portion of the tension member 10 stretched on the lower horizontal rod 8. This protects the portion from being damaged. In particular, as in the chair of the present embodiment, the upholstery material 10 is installed between the front and rear desks 2 in a lecture room or the like and is tilted forward when not in use so that a person can pass behind the chair. Since an object may hit and damage the lower end of the cover, it is effective to prevent damage by covering and protecting the portion with the side cover piece 19b and the rear cover piece 17.

  In addition, if the gap between the outer peripheral surfaces of the left and right side bars 9a and 9a and the concave grooves 21 of the left and right fitting portions 22 and 22 is provided so that the upholstery material 10 can be inserted, Even after the frame 9 is fixed to the seat frame 13, the upholstery material 10 can be stretched on the back frame 9.

Next, after fixing the seat frame 13 to the upper end portion of the pedestal 4 in the manner described above, the front and rear left and right four boss portions 31 projecting from the front end portion of the base plate 18 and the rear portion of the seat frame 13 are arranged. Bolts 33 are inserted into the mounting holes 32 from below, and the upper ends of the bolts 33 are screwed into female screw holes (not shown) on the lower surface of the seat plate 15.
Thereby, the seat plate 15 to which the cushion material 14 is attached is inserted into a space portion whose rear end portion is surrounded by the side cover pieces 19b and the rear cover pieces 17 of the left and right backrest mounting portions 19, 19, and It is attached to the upper surface of the seat frame 13 so as to cover the lower reed 8 from above (see FIG. 3).

  As described above, in the chair according to the above-described embodiment, the mesh-like upholstery material 10 having stretchability, breathability, and translucency is stretched on the back frame 9 having a frame shape. A comfortable sitting experience, and even when the chair is tilted forward to a non-use position, a shadow may be cast on the rear side of the top plate 7 of the desk 2 to darken the desk surface or present a feeling of pressure. Absent. In addition, the visibility of the desk surface from the front, diagonally upper front, side, and the like is also improved.

  Further, since the backrest 6 and the seat plate 15 are detachably screwed to the seat frame 13, after removing both the seat plate 15 and the backrest 6 or only the seat plate 15 from the seat frame 13. By simply opening the fastener provided at the opening at the lower end of the upholstery material 10, the upholstery material 10 can be removed from the back frame 9 or attached over the upper frame 9, so that the upholstery material 10 is damaged. The replacement work at the time of failure becomes easy.

Further, left and right mounting brackets 11, 11 for attaching the backrest 6 to the seat frame 13 and a lower end portion of the back frame 9 on which the upholstery material 10 is stretched are on the side of the left and right backrest mounting portions 19 in the seat frame 13. Since it is covered with the part cover piece 19b and the rear cover piece 17, the appearance when the chair is tilted forward to the non-use position is improved.
Moreover, as described above, even when a person passes behind the chair when not in use and an object hits the lower end of the backrest 6 protruding rearward, the upholstery material 10 stretched on the lower end of the back frame 9 That is, the upholstery material 10 stretched on the lower end of the side rods 9a and 9a and the upholstery material 10 stretched on the lower horizontal rod 8 are protected by the side cover piece 19b and the rear cover piece 17. The risk of damaging those parts is very small.

  Further, as described above, when the back frame 9 with the tension member 10 stretched is attached to the left and right backrest mounting portions 19 of the seat frame 13, the lower ends of the left and right side scissors 9a and 9a in the back frame 9 are The seat frame 13 is fitted and positioned in the recessed groove 21 of the fitting portion 22 provided in the left and right backrest mounting portions 19, and the back frame 9 is prevented from being displaced in the front-rear and left-right directions with respect to the seat frame 13. The attachment work of the lower end portion of the back frame 9 to the frame 13 can be easily performed.

The rear corner portion 19c where the rear cover piece 17 and the side cover piece 19b are continuous has a large vertical dimension, and the lower end portions of the left and right side ribs 9b of the back frame 9 are formed in the vertical groove 21 provided in that portion. Therefore, the lower end portion of the back frame 9 is stably held by the rear corner portion 19c of the seat frame 13.
Further, since the backward and lateral loads applied to the back frame 9 are received by the rear corner portion 19c having a large vertical dimension, these loads are directly applied as bending loads to the left and right mounting brackets 11. There is nothing.

  In addition, this invention is applicable not only to the chair which is installed in the above floor surfaces so that rotation is possible in the front-back direction but to a normal general chair.

DESCRIPTION OF SYMBOLS 1 Chair 2 Desk 3 Base 4 Pillar 5 Seat 6 Backrest 7 Top plate 8 Lower side 9 Back frame 9a Side 9b Upper side 10 Tension material 11 Mounting bracket 11a Inwardly facing piece 11b Vertical piece 12 Nut 13 Seat frame 14 Cushion Material 15 Seat plate 16 Edge piece 17 Rear cover piece 18 Substrate 19 Backrest attachment portion 19a Support portion 19b Side cover piece 19c Rear corner portion 21 Groove 22 Fitting portion 23 Leg column attachment portion 23a Projection portion 24 Female screw hole 25 Mounting plate 26 Through hole 27 Bolt 28 Slit 29 Mounting hole 30 Bolt 31 Boss portion 32 Mounting hole 33 Bolt F Floor

Claims (4)

  In a chair comprising a seat frame supported by legs and a back frame with a back attached to the lower part thereof, the back frame is formed in a frame shape, and the back frame is knitted in a mesh shape, In addition, a bag-like upholstery material with an opening at the bottom is placed over and stretched, and the attachments provided at the lower parts of the left and right sides of the back frame can be attached to and detached from the upper surfaces of both sides of the rear part of the seat frame. The cover frame is erected on the rear edge and rear side edges of the seat frame so that the left and right attachment parts and the lower part of the back frame on which the upholstery material is stretched can be covered from the rear and both sides. A chair characterized by that.   On the inner surfaces of the left and right rear corners of the cover piece, there are provided concave grooves facing in the vertical direction that are recessed outward in a semicircular shape in plan view. The chair according to claim 1, which is formed by fitting a tension material stretched on the portion.   The chair according to claim 2, wherein the vertical dimension of the rear corner of the cover piece is larger than the vertical dimension of the cover pieces on the rear and both sides.   The left and right mounting parts of the back frame are L-shaped brackets facing in the front direction and the rear ends fixed to the front surfaces of the lower ends of both sides, and the inwardly facing pieces of both brackets are seat frames. The chair according to any one of claims 1 to 3, wherein the chair is detachably fixed to the upper surfaces of both side portions of the rear portion with screws.

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