JPH09220136A - Back rest of tubular chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have preferable maintaining performance in which a detaching work of a cover in association with mending, replacement, or the like of the seat cover can be easily performed and to prevent deformation or breakage by sufficiently assuring rigidity. SOLUTION: A band-shaped bridging crosspiece 23 is bridged over both sides of a back rest frame 20, rivet engagement holes 32 are formed in the upper part of the front face of a lining 30, rivets 60 are provided on the rear face side of a cover 40, and retaining members 41 are further formed. Each of the rivets 60 is constructed in such a manner that a number of elastic fin members are closely arranged along the axial direction on the outer face of a shaft part. The lining 30 is screwed on the rear face side of the back rest frame 20. The retaining members 41 of the cover 40 are retained by the bridging crosspiece 23 and the shaft part of each of the rivets 60 is fit into a rivet fitting hole 32a, thereby attaching the cover 40 on the front side of the back rest frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest of a pipe chair that is preferably used in, for example, a concert hall or an event venue.

[0002]

2. Description of the Related Art As shown in FIG. 11, the backrest of a pipe chair used in a concert hall or the like is usually an inverted U-shaped backrest frame (1) provided upright at the rear of the seat.
It comprises a facing (2) provided on the front side thereof and a backing (3) provided on the back side of the backrest frame (1).

Conventionally, in the backrest as described above, the upholstery (2) is usually attached to the backrest frame (1) by a work from the back side. For example, the backrest shown in the figure has both sides (1a) of the backrest frame (1).
Fittings (1b) are provided at the upper and lower positions of (1a) so as to project inward, and a plurality of screws (4) are respectively provided in the fitting holes (1c) of the fittings (1b) from the back side. The outer cover (2) is fixed to the backrest frame (1) by being inserted and screwed into the embedded nut (2a) of the outer cover (2). The backing (3) is fixed to the back side of the backrest frame (1) using an adhesive, rivets or the like.

[0004]

The pipe chair as described above, like other chairs, deteriorates with repeated use. Therefore, in order to use the pipe chair stably for a long period of time, repair or repair of the deteriorated portion is required. It is customary to carry out exchanges, etc.
In particular, the upholstery (skin sheet 2b) of the upholstery (2) is in direct contact with the seated person, so it deteriorates faster than other parts, and it is necessary to repair or replace it in a relatively short cycle.

Under these circumstances, in the above-mentioned conventional backrest, the cover (2) is attached by working from the back side of the backrest frame (1), so that the cover (2) is detached. Backing (3)
Must be removed to open the back side of the facing (2). That is, in order to remove the upholstery (2) for exchanging upholstery, etc., first attach the backing (3) to the backrest frame (1).
After removing the outer cover, the outer cover (2) is removed, and after performing necessary treatment such as replacement of upholstery, the outer cover (2) is attached to the frame (1), and the backing (3) is further attached to the frame. It is necessary to attach to (1). In this way, when repairing the surface covering (2), it is necessary to remove even the backing (3) that does not require repairing, and the repairing and replacement work of the surface covering (2) is troublesome and maintenance is easy. There was a problem that it was inferior to. Moreover, since many chairs of this type are used in concert halls and the like as described above, the above-mentioned surface covering repair and replacement work must be performed frequently, and there is a strong demand for improved maintainability. .

The backrest of the above conventional pipe chair is
Since the frame (1) is arranged only on the outer peripheral edge portion, sufficient strength cannot be ensured, and the frame (1) is deformed and the backrest shape is deformed when the frame (1) is handled a little roughly. There was a problem that it would be damaged or damaged in some cases.

The present invention solves the above-mentioned problems of the prior art, makes it possible to easily carry out the work of attaching and detaching the cover due to the repair or replacement of the cover, provide good maintainability, and ensure sufficient rigidity. The purpose of the present invention is to provide a pipe chair backrest that can prevent deformation and damage.

[0008]

In order to achieve the above object, the present invention provides a backrest of a pipe chair in which an inverted U-shaped backrest frame is provided with a front cover on the front side and a back side is provided with a backing. A plurality of rivet engagement holes are formed in the upper part of the front side of the backing, and the plurality of rivets are formed on the rear side of the cover. A plurality of rivets are provided corresponding to the engaging holes respectively, and a plurality of hooking pieces are provided corresponding to the bridging crosspieces, and the rivets are dense on the outer peripheral surface of the shaft portion along the axial direction. The backing is attached to the back side of the backrest frame via fixing means, while the hooking piece of the surface covering is hooked on the bridging bar. Stop At the same time, the shaft portion of the rivet is fitted into the rivet engaging hole, and the elastic fin piece of the rivet engages with the inner circumference of the rivet engaging hole, so that the surface covering is placed on the front surface side of the backrest frame. What is attached is the gist.

In the present invention, the hooking member having the surface covering is
The surface of the backrest frame is fixed by hooking it on the bridge rails, fitting the shaft of the rivet into the rivet engaging hole of the backing, and engaging the elastic fin piece of the rivet with the inner circumference of the rivet engaging hole. Since it is attached to the front side of the backrest frame, the surface covering can be removed simply by peeling it off from the backrest frame and the backing so as to release the engagement of the rivet and the engagement of the retaining piece.
It can be attached simply by pressing it against the backrest frame and backing so as to engage the rivets and the hooking pieces. In this way, the front cover can be removed and attached only from the front side, the backing does not need to be removed, and the troublesome screw fixing screw removal work is not necessary, so the cover can be easily attached and removed. The tension can be easily repaired.

Further, since the lower portions of both sides of the backrest frame are connected by the bridges, the frame rigidity, and by extension, the rigidity of the entire backrest, can be improved, and problems such as frame deformation and deformation of the backrest shape can be reliably prevented. can do.

[0011]

1 is a perspective view showing a pipe chair to which an embodiment of the present invention is applied, and FIGS. 2 to 4 are views showing a backrest of the chair.

As shown in these figures, the backrest (10) of this chair has an inverted U-shape arranged along its outer peripheral edge.
A backrest frame (20) made of a character-shaped metal round pipe, a backing (30) arranged on the back side of the backrest frame (20), and a cover (40) arranged on the front side of the backrest frame (20). ) And are provided as basic components.

As shown in FIGS. 2 to 5, the backrest frame (20) is made of a rectangular metal so as to project inwardly at the upper positions of both side edges (21) (21) thereof. Mounting brackets (22) (22) made of thin plates are fixed to each other. Each mounting bracket (22) has screws (5
A screw insertion hole (22a) is formed so that the shaft portion of (0) can be inserted.

Further, a bridging bar (23) made of a strip-shaped thin metal plate is fixed to the lower portions of the both sides (21) (21) of the frame so as to bridge the both sides. The bridging crosspiece (23) is formed so as to be curved forward following the curved shape of the backrest, and the central region is recessed rearward to form a rib (23b) extending in the lengthwise direction. . Further, on both sides of the bridge (23), screw insertion holes (23a) (2) through which the shaft portion of the screw (50) can be inserted.
3a) is formed.

As shown in FIGS. 7 to 9, the backing (3
0) is an integrally molded product of hard synthetic resin, and screw fixing portions (31) are integrally formed at four positions on the front side, that is, vertically and horizontally. Screw stop (3
1), the protrusions (31
a) (31a) and a nut hooking bridge piece (31b) which is bridged between the tips of the protruding parts (31a) (31a), and are provided at the center of the nut hooking bridge piece (31b). Has a screw insertion notch (31c) through which the shaft of the screw (50) can be inserted.

The nut-locking bridging piece (31b) of each screw stopper (31) has a U-shaped nut (5) having an inverted U-shaped side cross section.
1) is externally fitted from above. Each U-shaped nut (5
In 1), screw fixing holes (51a) for screwing the screws (50) are formed respectively on both side pieces thereof, and the screw fixing holes (51a) are the above-mentioned nut connecting bridge pieces (31b). It is arranged so as to correspond to each of the screw insertion notches (31c).

Rivet engaging portions (32) are integrally formed at three positions on the front side of the backing (30).

Each rivet engaging portion (32) is formed of a tubular member that projects forward as shown in FIGS. 2 and 3, and the inner periphery of its tip projects inward. Thus, the rivet engaging inner peripheral convex edge (32b) is formed, and the rivet engaging hole (32a) is formed by being surrounded by the rivet engaging inner main convex edge (32b). The rivet engaging hole (32a) is formed in a countersink shape by forming the rivet engaging inner peripheral convex edge (32b) so as to become thinner toward the inside.

On the other hand, as shown in FIGS. 2 to 4 and 6, the surface covering (40) is provided with a core plate (40a) which is an integrally molded product of hard synthetic resin. 40
Hooking pieces (41) are integrally formed at three lower portions on the back side of a) corresponding to the bridging bars (23) of the backrest frame (20).

Each hooking piece (41) is formed in an inverted L-shape when viewed from the side, and the bridge piece (2) of the backrest frame (20) is formed.
It is configured so that it can be hooked on 3) from above.

Further, three rivet setting holes (42) are formed in the facing core plate (40a) so as to correspond to the rivet engaging portions (32) of the backing (30).

Specific rivets (60) called Christmas rivets, Christmas clips, etc. are arranged in the respective rivet setting holes (42). As shown in FIG. 10, the rivet (60) is made of a hard synthetic resin, and a large number of elastic fin pieces (65) are arranged on the outer peripheral surface of the shaft portion (61) in a dense arrangement along the axial direction. ) Is integrally formed. The shaft part (61) of the rivet (60) is inserted into the rivet setting hole (42) from the front side and protrudes to the back side, and the peripheral part of the rivet head (62) is covered with the cover core plate (40a). ) Is arranged in a state of being locked to the peripheral portion of the rivet setting hole (42) on the front side of the rivet (60), and in this state, the head (62) of the rivet (60) is attached to the front side of the facing core plate (40a). The rivet (60) can be fixed by tacking or adhering a rivet pressing sheet piece (not shown) so as to cover it.

The rivet setting hole (42) is formed as a so-called fool hole, that is, the rivet setting hole (42).
Is formed to be considerably larger than the diameter of the rivet shaft portion (65) so that the rivet (60) can move to some extent along the radial direction orthogonal to the shaft portion (65).

Further, on the front side of the surface covering core plate (40a),
A cushion material is arranged, and a skin sheet (covering material 45) is arranged so as to cover the cushion material, and an outer peripheral edge portion of the skin sheet (45) has a surface covering core plate (40).
It is fixed to the outer peripheral edge of the back side of a) by tacking,
A facing (40) is constructed.

The backrest (10) of this embodiment is made up of the above-mentioned components, which are assembled as described below.

That is, the backing (30) is attached to the back side of the backrest frame (20), and the U of the screw fixing portion (31) is provided.
The letter nut (51) is arranged so as to face the screw insertion holes (22a) (23a) on the frame (20) side. Then, from the front side, screw (50) each screw insertion hole (22a)
They are respectively inserted into (23a) and fastened to nuts (51), thereby fixing the backing (30) to the backrest frame (20). Since the screw fixing portion on the bridging crosspiece (23) side has almost the same structure as the screw fixing portion on the mounting metal fitting (22) side shown in FIGS. 8 and 9, reference numerals in parentheses in FIGS. 8 and 9. Is used to show the structure of the screw stop on the side of the bridge (23).

Next, on the front surface side of the backrest frame (20), the hooking piece (41) of the upholstery (40) is hooked on the bridging bar (23) on the frame (20) side. At this time, the rivets (60) of the surface covering (40) are positioned so as to face the rivet engaging holes (32a) of the backing (30).

Subsequently, the rivet setting position is pushed into the backing (30) side from the front side of the surface covering (40). At this time, first, the rivet (60) is lightly pushed in, a small amount of the rivet shaft portion (61) is inserted into the rivet engaging hole (32a), and the elastic fin piece of the rivet shaft portion (61) is inserted at a relatively shallow position. (65) is engaged with the rivet engaging inner peripheral convex edge (32b) in a slip-off preventing manner to temporarily fix the surface covering (40). In the temporarily fixed state, it is confirmed whether or not there is any problem. If there is no problem, the rivet (60) is strongly pushed in, and the rivet shaft portion (61) is pushed into the rivet engaging hole (32a).
And the elastic fin piece (65) is engaged with the rivet engaging inner peripheral convex edge (32b) in such a manner that the elastic fin piece (65) does not come off.

During this fixing, the surface covering (40)
Since the rivet setting hole (42) is formed to have a large diameter (dumb hole), the rivet (60) and the rivet engaging hole (32)
Even if there is some dimensional error with respect to a), the rivet (60) moves so as to absorb the error, so that the rivet (60) can be reliably engaged.

On the other hand, in the backrest thus assembled, in order to remove the surface covering (40) for the purpose of exchanging upholstery, etc., pull the upper part of the surface covering (40) toward the front (front) side with a little stronger force. It is peeled off and separated from the backrest frame (20). As a result, the rivet (60) on the surface (40) side comes out of the rivet engaging hole (32a) while the elastic fin piece (65) is elastically deformed, and the rivet (60) and the engaging hole (32a) are formed. Is disengaged.

Next, while lifting the upholstery (40) upwards and pulling it away from the backrest frame (20), the latching of the latching piece (41) with the bridge bar (23) is released. The facing (40) can be removed.

After that, after subjecting the surface covering (40) to an appropriate treatment such as exchanging upholstery or the like, in order to re-assemble it on the backrest frame (20), the surface covering (40) is mounted as described above. It suffices that the hooking piece (41) is hooked on the bridge (23) and pushed into the backing (30) side.

As described above, since it is possible to remove the front cover (40) only by the work from the front side and it is not necessary to remove the backing (30), the front cover (30) can be detached without any work. The upholstery (40) can be easily removed and attached, and the upholstery (40)
It is possible to easily carry out repair and replacement work and to obtain good maintainability.

Further, since the surface covering (40) is attached by the hooking by the hooking piece (41) and the engagement by the rivet (60), a troublesome screw attaching / detaching operation is not required.
With a simple operation such as a peeling operation or a pushing operation, the surface covering (40) can be attached / detached, and more excellent maintainability can be obtained.

Further, in this embodiment, a large number of elastic fin pieces (6) are formed on the outer peripheral surface of the specific rivet (60), that is, the shaft portion (61), in a dense arrangement along the axial direction.
5) is used, it is possible to engage with the rivet engagement hole (32a) at any position in the axial direction of the rivet shaft portion (61). In other words, it is possible to freely change the amount of fitting of the rivet (60) into the engagement hole (32a), and by adjusting the amount of fitting,
Since an assembling error between the surface covering (40) and the backing (30) can be absorbed, the assembling work can be easily performed.

Further, in the present embodiment, a bridge bar (2) is provided between the lower portions of both sides (21) (21) of the backrest frame.
Since it is connected by 3), the frame rigidity is improved,
The rigidity of the entire backrest is improved. For this reason, even when handled roughly, it is possible to reliably prevent defects such as frame deformation and backrest shape deformation. Moreover, since the ribs (23b) are formed in the intermediate region of the bridge (23), the rigidity of the bridge (23), that is, the frame rigidity and the rigidity of the entire backrest can be further improved. The members such as the cross-linking bars (23) peculiar to the present embodiment are extremely light weight based on the weight of the entire chair, and the weight of the entire chair hardly increases and the weight increases. There is no.

Further, in the present embodiment, the bridging crosspiece (2) which is bridged between both sides (21) and (21) of the backrest frame is used.
Since 3) is used not only as a member for hooking the hooking piece (41) but also as a reinforcing member for improving frame rigidity, the number of parts can be reduced by also using as a member. .

In the above embodiment, the hooking piece (4
1) and three rivets (60) are provided together, the number of these is not particularly limited in the present invention, and two or more may be provided for each.

[0039]

As described above, according to the present invention, the hooking piece having the surface covering is hooked on the bridging bar of the backrest frame, and the shaft portion of the rivet is fitted into the rivet engaging hole of the backing. Since the elastic fin of the rivet is engaged with the inner circumference of the rivet engaging hole to attach the cover to the front side of the backrest frame, the cover is engaged with the rivet and the hooking piece is hooked. It can be removed by simply peeling it off from the backrest frame and backing so as to release the stop, and it can be attached by simply pressing on the backrest frame and backing so as to engage the rivets and the hooking piece. You can In this way, the front cover can be removed and attached only from the front side, the backing does not need to be removed, and the troublesome screw fixing screw removal work is not necessary, so the cover can be easily attached and removed. The tension can be easily repaired and good maintainability can be obtained. Furthermore, since the lower portions of both sides of the backrest frame are connected by bridge bridges, it is possible to improve the frame rigidity, and thus the rigidity of the entire backrest, and to reliably prevent problems such as frame deformation and deformation of the backrest shape. There is.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pipe chair to which a backrest according to an embodiment of the present invention is applied.

FIG. 2 is an exploded perspective view of the backrest of the embodiment.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is an exploded view of FIG.

FIG. 5 is a front view showing a backrest frame in the backrest of the embodiment.

FIG. 6 is a rear view showing the upholstery on the backrest of the embodiment.

FIG. 7 is a front view showing the backing of the backrest of the embodiment.

8 is a side cross-sectional view showing the vicinity of the screw fastening portion in the backrest of the embodiment, which is a view corresponding to the cross section along the line VIII-VIII of FIG. 7. FIG.

FIG. 9 is a horizontal cross-sectional view showing the vicinity of the screw fastening portion in the backrest of the embodiment, which is a view corresponding to the cross section taken along line IX-IX of FIG. 7.

FIG. 10 is a perspective view showing a rivet applied to the backrest of the embodiment.

FIG. 11 is an exploded perspective view showing a backrest of a conventional pipe chair.

[Explanation of symbols]

 10 ... Backrest 20 ... Backrest frame 21 ... Backrest frame both sides 23 ... Crosslinking bar 30 ... Backing 32a ... Rivet engagement hole 40 ... Surface covering 41 ... Latching piece 50 ... Screw (fixing means) 51 ... Nut (fixing means) 60 ... Rivet 61 ... Rivet Shaft 65 ... Elastic Fin Piece

Claims (1)

[Claims] 1. A backrest of a pipe chair in which a front U-shaped backrest frame is provided with a front cover and a back is provided with a backing, and a bridging bar is provided between lower portions of both sides of the backrest frame. A plurality of rivet engagement holes are formed in the upper part of the front side of the backing, and a plurality of rivets are provided corresponding to the plurality of rivet engagement holes on the back side of the cover. ,
A plurality of hooking pieces are provided corresponding to the bridging crosspieces, and the rivet is composed of a large number of elastic fin pieces formed on the outer peripheral surface of the shaft portion in a dense arrangement along the axial direction. While the backing is attached to the back side of the backrest frame via a fixing means, the hooking piece of the surface covering is hooked on the bridging bar, and the shaft portion of the rivet has the rivet engaging hole. The backrest of a pipe chair characterized in that the outer cover is attached to the front side of the backrest frame when the elastic fin piece of the rivet engages with the inner circumference of the rivet engaging hole.