JP5378870B2 - Connection structure between seat and backrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting structure between a seat body and a backrest to firmly and tidily connect the backrest to the rear end of the seat body. <P>SOLUTION: A backrest attaching member 8 whose upper surface abuts on the lower surface of a backrest frame 21 is anchored to the rear end of a seat frame 7 of the seat body 5, and fitting projections 27 projecting in the lower surface of the backrest frame 21 are fitted into fitting holes 18 and 19 bored on the upper surface of the backrest attaching member 8. The seat frame 7, the backrest attaching member 8 and the backrest frame 21 are clamped by clamping means 35 and 38. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a connecting structure between a seat and a backrest in a chair installed in a waiting room of a public facility, for example.

Unlike office chairs, chairs installed in waiting rooms of public facilities do not sit for long periods of time, so the backrest is not tilted and attached to the seat so that it cannot tilt. It is common.
As a conventional chair in which the backrest is attached so as not to be tilted, for example, there are those described in Patent Documents 1 and 2.

Japanese Utility Model Publication No. 38-15750 JP-A-10-179321

  The chair described in Patent Document 1 is fitted to a pair of left and right connecting pipes erected at the rear end of the seat so that a pair of connecting hooks at both ends of the backrest can be inserted and removed from above. Since the lower end portion of the backrest is fixed to the rear end portion of the seat body by screwing the connection tube and the connection rod, the coupling strength between the seat body and the backrest is small. In order to cope with this problem, the connecting pipe and the connecting rod fitted to the connecting pipe have only to have a large diameter and a long size. However, in this case, since they are greatly exposed to the outside, the appearance is deteriorated.

In the chair described in Patent Document 2, a vertically extending cylindrical body (or bar body) provided at the rear end of a seat frame for seat mounting is provided with a bar body (or a bar body) projecting downward on the lower end surface of the backrest (or Since the backrest is attached to the seat frame so as not to be tiltable by detachably fitting the cylindrical body), the backrest may come off above the seat frame.
Further, since the backrest is supported by the seat frame by the cylindrical body and the rod body, the mounting strength of the backrest is small.

  The present invention has been made in view of the above problems, and provides a structure for connecting a seat back and a backrest, which can connect the backrest to the rear end of the seat body in a strong and good manner. The purpose is to do.

According to the present invention, the above-mentioned problems are solved as follows.
(1) A backrest mounting member facing in the left-right direction whose upper surface contacts the lower surface of the back frame in the backrest is fixed to the rear end portion of the seat frame of the seat body, and the back frame and the backrest mounting member are in contact with each other A pair of left and right fitting protrusions, which are also provided on one of the surfaces, are fitted in at least one pair of left and right fitting holes that face in the vertical direction, and are backrested with the seat frame. The mounting member and the back frame are fastened with fastening means.

With such a configuration, the fitting protrusion projecting on the other side is fitted in the fitting hole facing the vertical direction provided on either the back mounting member or the back frame with which the opposing surfaces abut each other. In this state, the seat frame, the backrest mounting member, and the back frame are fastened with fastening means, so that the lower end of the backrest can be firmly connected to the rear end of the seat.
Further, by fitting the fitting protrusion into the fitting hole, the backrest mounting member and the back frame have a sense of unity, and the connecting portions of each other are not exposed.

(2) In the above item (1), the fastening means is inserted from the lower side of the seat frame, and the bolt is directed vertically through the fitting projection and part of the lower end of the back frame, and the upper end of the bolt It shall consist of the nut screwed together by the part.

With such a configuration, the bolts facing in the vertical direction function as a core material that reinforces the fitting protrusion, so that the bending strength in the front-rear direction of the connecting portion in the back frame increases, and the risk of wobbling in the front-rear direction is small. Become.
In addition, since the bolts and nuts are not greatly exposed, appearance is improved.

(3) In the above item (1) or (2), an upright piece projecting in the left-right direction is provided on the upper surface of the backrest mounting member, and the upright piece is provided in an upward concave hole provided on the lower surface of the back frame. Mating.

  With such a configuration, the upright piece facing in the left-right direction is also fitted in the concave hole on the lower surface of the back frame, so that the fitting area between the backrest mounting member and the back frame is increased, and the fitting piece Since it has a reinforcing action, the connection strength at the lower end of the back frame is increased, and the possibility of wobbling in the front-rear direction is further reduced.

(4) In any one of the above items (1) to (3), the front and rear dimensions of the upper surface of the backrest mounting member and the lower surface of the back frame are larger than the front and rear dimensions of the fitting protrusion and the fitting hole, At the time of fastening by the fastening means, the upper surface of the backrest mounting member and the lower surface of the back frame are brought into close contact with each other.

  With such a configuration, the lower surface of the back frame is in the front-rear direction because the lower surface of the back frame and the upper surface of the backrest mounting member are in close contact with each other in a wide area and the bending load acting on the connecting portion is dispersed and reduced. The fear of wobble is small.

(5) In the above item (4), the upper surface of the backrest mounting member and the lower surface of the back frame are inclined surfaces that are inclined obliquely downward downward.

  With such a configuration, the contact area between the upper surface of the backrest mounting member and the lower surface of the back frame increases, so that the lower end of the back frame is less likely to wobble in the front-rear direction.

(6) In any one of the above items (1) to (5), the fitting protrusion is a rectangular shaft that is long in the left-right direction, and the fitting hole is a fitting protrusion that has each of the shaft shapes. The shape is complementary.

  With such a configuration, since the fitting area between the fitting hole and the fitting protrusion is increased and the rigidity of the fitting protrusion is increased, the connection strength of the back frame is increased.

  According to the present invention, the lower end portion of the backrest can be firmly connected to the rear end portion of the seat body, the backrest mounting member and the back frame have a sense of unity, and the connecting portions are also exposed. Because it does not, it can be connected well.

It is a front view of the connection chair to which the present invention is applied. Similarly, it is a side view. Similarly, it is a partially cutaway enlarged front view. It is the IV-IV line vertical side view of FIG. Similarly, it is a VV line expansion vertical side view. It is a perspective view before connection of a backrest attachment member and a back frame. Similarly, it is a front view. Similarly, it is a side view. It is the perspective view which looked at the back frame from back. It is an expanded vertical side view of the principal part which shows other embodiment of the connection part of a backrest attachment member and a back frame.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a chaise lounge installed in a waiting room or the like to which the present invention is applied. FIG. 2 is a side view of the chaise lounge. The left and right ends of the leg 1 are fixed to a square reed 2, the same four-legged chair 3 attached to the upper surface thereof, and the lower end of the reed 2 on both sides of each chair 3. Are provided with a plurality of armrests 4 fixed thereto.

  As shown in FIG. 3 which is a partially cutaway enlarged front view and FIG. 4 which is a cross-sectional view taken along line IV-IV in FIG. 3 (the same structure is shown, only the chair on the right end side is shown). A seat body 5 and a backrest 6 are provided. The seat body 5 has a rectangular seat frame 7 made of plywood or synthetic resin, and a right and left dimension fixed to the upper surface of the rear end portion thereof is substantially equal to that of the seat frame 7. The backrest mounting member 8 made of synthetic resin and the cushion body 9 fixed to the upper surfaces of the seat frame 7 and the backrest mounting member 8 so as to cover the entire surface except for the lower surfaces thereof. .

The seat frame 7 is secured to the upper ends of a pair of left and right brackets 10 and 10 facing the front and rear direction welded to the horizontal flange 2 by being embedded in the bolts 11 and the seat frame 7 to be prevented from rotating. It is fixed by a female screw cylinder 12.
As shown in FIG. 5, the both sides on the front side of the backrest mounting member 8 are bolts fitted from above into a stepped hole 14, which will be described later, in a female screw cylinder 12 embedded in the rear portion of the seat frame 7 and prevented from rotating. 11 is fixed by screwing together. Similarly, both side portions on the rear side are fixed to a rear end portion of the seat frame 7 together with a back frame 21 described later (details will be described later).

  As shown in FIGS. 6 to 8, the backrest mounting member 8 has a substantially triangular side surface and a rear end portion of the cushion body 9 at the center of the front inclined surface 8 a inclined obliquely forward and downward. A recess 13 into which the bolt 11 is inserted is formed, and stepped holes 14, 14 into which the bolts 11 are fitted are formed in the front inclined surfaces 8 a on both sides sandwiching the recess 13. A bifurcated locking piece 15 for locking a retracting member (not shown) for fixing a part of the upper surface on the rear side of the cushion body 9 downward is provided on the upper surface of the front end portion of the recess 13. A plurality of left and right protrusions are provided.

  The rear inclined surface 8b inclined obliquely rearward and downward of the backrest mounting member 8 has a forward-facing U-shape in plan view comprising a rear standing piece 16a facing in the left-right direction and left and right side standing pieces 16b, 16b facing in the front-rear direction. An upward fitting portion 16 is vertically formed, and the inner space of the upward fitting portion 16 is partitioned by partition pieces 17 and 17 that are separated from each other in the left and right directions. A pair of left and right rectangular fitting holes 18, 18 that are long and open upward are formed. On both sides of the rear inclined surface 8 b facing the left and right fitting holes 18, 18, bottomed fitting holes 19, 19 having the same shape as the fitting hole 18 communicate with both the fitting holes 18. (See FIG. 5). Note that the front and rear dimensions of the rear inclined surface 8b are larger than the front and rear dimensions of the fitting holes 18 and 19 so as to be in contact with the lower surface of the back frame 21 described later.

  On the lower surface of the rear end portion of the backrest mounting member 8, a projecting piece 20 having a vertical dimension substantially equal to the plate thickness of the seat frame 7 is projected downward, and the front surface of the projecting piece 20 is in contact with the rear end of the seat frame 7. By making contact, the backrest mounting member 8 can be positioned in the front-rear direction with respect to the seat frame 7 (see FIGS. 5 and 6).

As shown in FIGS. 3 to 5, the backrest 6 is covered with a skin material 22 a that is covered from above so as to cover the entire surface except the back frame 21 made of synthetic resin and the lower end portion thereof. And a bag-like cushion body 22.
As shown in FIGS. 6 to 8, the back frame 21 is composed of a lower frame 23 that has a lateral dimension slightly smaller than that of the backrest mounting member 8 and faces in the left-right direction, and upper surfaces of both side portions of the lower frame 23. A pair of left and right side frames 24, 24 that stand more vertically and a lower half space between both side frames 24 are closed so as to be integrally connected to the opposing surface and the upper surface of the lower frame 23. The front frame of the lower frame 23 and the left and right side frames 24 has a substantially upward U-shape, and the entire shape of the back frame 21 is substantially the same as the front view with the upper half part released. As a concave shape.

As shown in FIGS. 6 to 9, the lower frame 23 includes a vertical rear surface plate 23 a that faces in the left-right direction and left and right side plates 23 b, 23 b that face in the diagonally up-down direction. It is inclined in the same direction as the rear inclined surface 8b.
The left and right dimensions and the front and rear dimensions of the lower frame 23 are slightly larger than the dimensions between the outer surfaces of the left and right side frames 24 and 24 and the front and rear dimensions of the lower ends of the both side frames 24, respectively. On the upper surface of the peripheral edge portion, a step surface 23c is formed so that the lower end of the cushion body 22 excluding the skin material 22a contacts and is positioned (see FIG. 5). Further, the front-rear dimension of the lower frame 23 is larger than the front-rear dimension of the fitting protrusion 27 described later.

  In the interior surrounded by the rear plate 23a and the left and right side plates 23b, an upward fitting recess 26 is formed that can be fitted to the upper fitting portion 16 of the backrest mounting member 8 from above. A pair of left and right fitting holes 18 formed in the upward fitting portion 16 and the rear inclined surface 8b of the backrest mounting member 8 are formed in the center of the lower surface of the lower frame 23 in the front-rear direction inside the concave portion 26. , 19, which are complementary to them and have a rectangular shaft-shaped fitting protrusion 27, 27 that is complementary to them.

As shown in FIG. 5, between the opposing surfaces of the fitting protrusion 27 and the rear plate 23a, an upward concave hole into which the rear standing piece 16a in the upward fitting portion 16 of the backrest mounting member 8 is fitted. 28 is formed.
Further, the end of the skin material 22a of the cushion body 22 is fitted to the lower surface of the peripheral edge of the lower frame 23, that is, the lower surface of the front end portion of the lower frame 23, and the lower end surfaces of the rear surface plate 23a and the side surface plates 23b. The locking groove 29 for engaging with each other is formed continuously (see FIGS. 5 and 7).

  The upper portions of the left and right side frames 24, 24 are curved in an arc shape so as to face obliquely upward, and the front and rear dimensions on the lower side from the curved portion are gradually increased toward the lower side. In addition, by curving the lower opposing surfaces in an arc toward the inside, the left and right dimensions of the lower half of both side frames 24 are gradually increased downward. Because of such a structure, the rigidity of the lower half of the side frames 24, that is, the bending strength in the front-rear and left-right directions is increased, and the strength of the entire back frame 21 can be increased.

  The back plate 25 is connected to the rear end portion of the lower frame 23 and the left and right side frames 24. As shown in FIGS. 4 and 6, the back plate 25 is disposed in front of the back plate 25 and on the upper surface of the lower frame 23. A recessed step portion 30 is formed for positioning the body 22 in the vertical and horizontal directions and mounting it stably. Note that a plurality of ribs 31 facing in the vertical direction are provided on the rear surface of the upper half of the back plate 25 so as to protrude in the left-right direction, thereby increasing the strength of the back plate 25.

  S-shaped springs 32, 32 are disposed between the upper ends of the arcuate curved portions of the left and right side frames 24 and the slightly upper facing surfaces of the back plate 25, and both ends thereof are located inside the side frames 24. It is stretched so as to bend in the front-rear direction by engaging with two upper and lower engaging members 33, 33 projecting inwardly on the side surface.

Next, a procedure for connecting the backrest 6 to the seat body 5 will be described.
First, as shown in FIG. 4, the back frame 21 is covered with a cushion body 22 from above, and as shown in the enlarged view of FIG. 5, the end portion of the skin material 22 a is formed on the lower surface of the peripheral portion of the lower frame 23. It is inserted into the engaging groove 29 and engaged. At this time, since the recessed step portion 30 and the step surface 23c are formed on the upper surface of the lower frame 23 in front of the back plate 25 and the peripheral edge portion of the lower frame 23, the cushion body 22 is It can be easily positioned in the vertical and horizontal directions and can be mounted stably.

  Next, as shown in FIGS. 5 and 6, the lower frame 23 of the back frame 21 is inserted into the pair of left and right fitting holes 18 and 19 of the backrest mounting member 8 whose front end is fixed to the rear upper surface of the seat frame 7. A pair of left and right fitting projections 27, 27 projecting downward are fitted from above. At this time, the rear standing piece 16a of the upward fitting portion 16 is also fitted into the concave hole 28 formed between the opposing surfaces of the fitting protrusion 27 and the rear plate 23a.

  Next, both the left and right side portions of the rear end portion of the seat frame 7, the bottom walls of the left and right fitting hole 19 forming portions of the backrest mounting member 8, and the left and right fitting projections 27 are provided in the vertical direction. A long bolt 35 that faces in the up-down direction is inserted into the bolt insertion hole 34 from below, and the upper end of the bolt 35 protrudes into the rear opening 36 formed in the lower end of the side frame 24. Then, a metal plate 37 press-fitted into the lightening hole 36 is passed through and screwed into a nut 38 welded to the upper surface of the metal plate 37 and tightened.

  Thereby, the lower end part of the back frame 21 and the backrest attachment member 8 are fastened together and firmly connected to the rear end part of the seat frame 7. In particular, a relatively long fitting protrusion 27 protruding from the back frame 21 is fitted into the fitting holes 18 and 19 of the backrest mounting member 8 and protruded from the upper surface of the backrest mounting member 8. In the upward fitting portion 16, the rear standing piece 16a facing in the opposite direction to the fitting projection 27 is fitted into the concave hole 28 between the facing surfaces of the fitting projection 27 and the rear plate 23a. Since the bolts 35 and the nuts 38 are fastened, the connection strength of the lower end portion of the back frame 21 with respect to the backrest mounting member 8 becomes extremely large. In addition, when tightening, the lower surface of the lower frame 23 of the back frame 21 is in close contact with the upper surface of the rear inclined surface 8b of the backrest mounting member 8 in a wide area, so that the back frame 21 is prevented from wobbling in the front-rear direction. .

  In addition, the left and right fitting protrusions 27 are penetrated by long bolts 35 that face in the vertical direction, and the left and right bolts 35 function as a core material that reinforces the fitting protrusions 27. The bending strength in the front-rear direction of the connecting portion in the frame 21 is increased.

  Furthermore, when the above-described insertion-type connecting structure is used, the backrest mounting member 8 and the back frame 21 have a sense of unity, and the connecting portions are not exposed. The connecting operation with the drooping 6 is also facilitated.

  When the bolt 35 and the nut 38 are tightened, the lower end of the skin material 22 is pressed against the upper surface of the back mounting member 8, so that the terminal portion of the skin material 22 is prevented from being detached from the locking groove 29.

  As described above, the back frame 21 has high rigidity, and the shape of the back frame 21 is substantially concave when viewed from the front with the upper half part released, so that the opposing surfaces of the upper half parts of the left and right side frames 24, 24 Since the S-shaped springs 32 and 32 are stretched between them, when the back is put on the cushion body 22, the upper half part is easily bent backward, and a comfortable backrest feeling is obtained.

The present invention is not limited to the above embodiment.
In the above embodiment, the fitting protrusions 27 protruding from the lower end of the back frame 21 are fitted into the fitting holes 18 and 19 provided on the back mounting member 8 side. The opposite is also possible. That is, as shown in FIG. 10, a fitting hole 39 that opens downward is provided on the lower surface of the lower frame 23 in the back frame 21, and the fitting hole 39 faces upward to the rear inclined surface 8 b of the backrest mounting member 8. The protruding projection 40 is fitted, and the seat frame 7, the backrest mounting member 8, and the back frame 21 may be fastened together by bolts 35 and nuts 38 penetrating them.
Even if it does in this way, there can exist an effect similar to the above.

  In the above embodiment, the fitting holes 18 and 19 and the fitting protrusion 27 are provided in a pair on the left and right, but two or more of them may be provided or may be provided continuously in the left and right direction.

  Of course, the present invention can be applied to an ordinary single chair in addition to the above-described connecting chair.

DESCRIPTION OF SYMBOLS 1 Leg 2 Recumbent 3 Chair 4 Armrest 5 Seat body 6 Backrest 7 Seat frame 8 Backrest mounting member 8a Front inclined surface 8b Rear inclined surface 9 Cushion body 10 Bracket 11 Bolt 12 Female screw cylinder 13 Recess 14 Stepped hole 15 Locking piece 16 Upward fitting portion 16a Rear standing piece 16b Side standing piece 17 Partition piece 18 Fitting hole 19 Fitting hole 20 Projection piece 21 Back frame 22 Cushion body 22a Skin material 23 Lower frame 23a Rear plate 23b Side plate 23c Stepped surface 24 Side frame 25 Back plate 26 Fitting recess 27 Fitting projection 28 Recess hole 29 Locking groove 30 Recessed stepped portion 31 Rib 32 S-shaped spring 33 Locking member 34 Bolt insertion hole 35 Bolt 36 Meat removal Hole 37 Metal plate 38 Nut 39 Fitting hole 40 Fitting protrusion

Claims (6)

  A backrest mounting member facing in the left-right direction whose upper surface contacts the lower surface of the back frame in the backrest is fixed to the rear end portion of the seat frame of the seat body, and any of the contact surfaces of the back frame and the backrest mounting member A pair of left and right mating projections projecting on the other side are fitted in at least one pair of left and right mating holes provided on either side, and the seat frame and the backrest mounting member A connecting structure of a seat body and a backrest, wherein the back frame is fastened with fastening means.   The tightening means is inserted from below the seat frame, and includes a fitting projection and a bolt that passes through a part of the lower end portion of the back frame and faces in the vertical direction, and a nut screwed into the upper end portion of the bolt. The connecting structure of the seat body and the backrest according to claim 1, which is configured as a thing.   The seating body according to claim 1 or 2, wherein an upright piece extending in the left-right direction is projected on the upper surface of the backrest mounting member, and the upright piece is fitted into an upward concave hole provided in the lower surface of the back frame. Connecting structure with the backrest.   The front and back dimensions of the upper surface of the backrest mounting member and the lower surface of the back frame are made larger than the front and rear dimensions of the fitting protrusion and the fitting hole, and the upper surface and the back frame of the backrest mounting member are secured when tightened by the tightening means. The connecting structure of the seat body and the backrest according to any one of claims 1 to 3, wherein the lower surface of the seat is in close contact.   The connecting structure of the seat body and the backrest according to claim 4, wherein the upper surface of the backrest mounting member and the lower surface of the back frame are inclined surfaces inclined obliquely rearward and downward.   The fitting projection is formed into a rectangular shaft shape that is long in the left-right direction, and the fitting hole is formed into a shape that complements the fitting projection that forms each of the shaft shapes. Connecting structure of the seat and backrest.

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