JPH0870951A - Seat back mounting structure of pipe chair - Google Patents

Abstract

PURPOSE: To provide a mounting structure for a pipe chair seat back, with which it is practicable to simplify the construction, suppress the costs, and perform the installing works simply while a high installation accuracy is secured. CONSTITUTION: A supporting plate 20 for a seat back 10 of pipe chair is formed as resin molding in which part of a joint pipe 21 of metal is secured as embedded by means of insert molding in the position where coupling is made with a seat back frame 3. The joint pipe 21 and seat back frame 3 are coupled together by a coupling pin 6, which is installed as penetrating them, in the condition that the projecting part of the joint pipe 21 is inserted to the top of the seat back frame 3, and thereby the seat back 10 is mounted on the frame 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest mounting structure for a folding pipe chair or the like provided with a resin backrest support plate.

[0002]

2. Description of the Related Art The backrest of a folding pipe chair is usually composed of a backrest support plate and a backrest cushion mounted on the front surface thereof. In recent years, a backrest support plate made of a resin molded product has been developed. Has been done.

The simplest means for attaching such a backrest to the backrest frame is to form a frame fitting hole for fitting the backrest frame in the backrest support plate during resin molding, and to fit the fitting hole. It is conceivable to insert the backrest frame distal end into the backrest frame and fix the backrest frame and the backrest support plate by rivets or the like.

However, in this mounting means, it is necessary to form a taper on the inner peripheral surface of the frame fitting hole in order to smoothly perform the die cutting of the frame fitting hole in the resin molding process, and it is essential for the resin molding. Due to the drawback, the frame fitting hole could not be formed in a perfect circle according to the frame diameter, and only the frame fitting hole with low dimensional accuracy could be formed. Therefore, there is a problem in that the frame fitting hole and the backrest frame do not match each other, the backrest rattles with respect to the frame, and the mounting accuracy deteriorates.

Therefore, in the past, in order to attach the backrest with high precision, for example, the following attachment means has been adopted.

That is, a joint mounting hole is formed at a position where the backrest support plate is connected to the backrest frame, and one half of a resin joint pipe having a retaining piece protruding from the outer periphery is retained in the joint mounting hole. The core pipe made of a metal pipe is inserted into the joint pipe, and the joint pin is inserted into the backrest support plate, the joint pipe and the core member to fix the joint pipe with the core member to the backrest. Furthermore, the other half of the joint pipe with core material is fitted into the backrest frame, the connecting pin is pierced through the backrest frame, the joint pipe and the core material, and the joint pipe with core material is fixed to the backrest frame. It was attached to the backrest frame.

[0007]

However, in the above-mentioned conventional backrest mounting means, since it is necessary to use the core material in addition to the resin-made joint pipe, the number of parts increases, resulting in a complicated structure and cost. There was a problem that it would increase.

Further, in the above structure, the pin holes formed in the joint pipe and the core member are respectively fitted to the pin holes of the backrest support plate and the pinholes of the backrest frame,
Although the connecting pin will be inserted, the work of adapting the pin hole requires a high degree of skill because it requires simultaneous positioning in the inserting direction and the rotating direction, which is very troublesome.
The troublesome work needs to be carried out between the joint pipe, the core member, the backrest support plate, and the backrest frame, which causes a problem that the backrest mounting work is very troublesome.

The present invention solves the above-mentioned problems of the prior art, simplifies the structure and reduces the cost, and at the same time ensures a high mounting precision, the backrest can be easily mounted on the backrest frame. The purpose of the present invention is to provide a backrest mounting structure.

[0010]

In order to achieve the above object, the present invention provides a pair of left and right metal pipes in which a backrest including a backrest support plate and a backrest cushion attached to the front surface of the backrest extends parallel to each other above the seat. A backrest mounting structure of a pipe chair attached to a backrest frame, wherein the backrest support plate is a resin molded product in which a part of a metal joint pipe is fixed in an embedded state by insert molding at a connection position with the backrest frame. And the joint pipe and the backrest frame are connected to each other by a connecting pin penetrating the joint pipe and the backrest frame, with the protruding portion of the joint pipe being inserted into the upper end of the backrest frame. The main point is to be attached to .

In the present invention, it is preferable to adopt a structure in which a cap for closing the opening of the end is attached to one end of the joint pipe on the buried side.

[0012]

In the structure for mounting the backrest of the pipe chair according to the present invention, the backrest support plate is made of a resin molded product in which a part of the metal joint pipe is fixed in an embedded state by insert molding at the connecting position with the backrest frame. Therefore, the work of attaching the backrest is completed only by inserting the projecting portion of the joint pipe into the upper end of the backrest frame and connecting the joint pipe and the backrest frame with the connecting pin. Further, since only the joint pipe and the connecting pin are used, the number of parts can be reduced.

Moreover, since the rotational position of the joint pipe with respect to the backrest frame is constant when the two joint pipes on both sides of the backrest are respectively inserted into the pair of backrest frames, the joint pipe is inserted to rotate the joint pipe in the rotational direction. , For example, the pin hole of the joint pipe and the pin hole of the backrest frame are automatically positioned.

Further, since the joint pipe is mounted with high positional accuracy by insert molding and the joint pipe with high positional accuracy serves as a core material, high mounting accuracy can be obtained.

In the present invention, in the case of adopting the constitution in which the cap for closing the opening of the end is attached to one end on the buried side of the joint pipe, the resin is prevented from entering the joint pipe at the time of molding the backrest support plate. Will be done.

[0016]

1 is a view showing a folding pipe chair to which an embodiment of the present invention is applied. As shown in the figure, the middle of both sides of the substantially U-shaped metal pipe for forming the front leg (1) and the backrest frame (3) (3) is pivotally attached to both sides of the seat body (4). The upper portions of both sides of the U-shaped pipe, that is, the backrest frames (3) and (3) are arranged so as to extend parallel to each other above the seat body (4), and the backrest frames (3) and (3). A backrest (10), which will be described in detail later, is attached between the upper ends of the.
Further, the upper portions on both sides of the substantially U-shaped metal pipe forming the rear leg (2) are pivotally attached to the rear portions on both sides of the seat body (4), and the upper ends of the rear legs (2) are on the backrest frame (3).
It is pivotally attached to the lower end of (3) via a connecting member (5).

In the chair of this construction, the seat body (4) and the rear legs (2) are rotated by the front body (1) by rotating the seat body (4) so as to cause the front portion thereof, if necessary. ) And the backrest frame (3), so that they can be folded compactly.

As shown in FIGS. 2 to 8, the backrest (10) attached to the backrest frame (3) is formed in a curved shape so as to be along the back surface of the occupant. It comprises a backrest support plate (20) and a curved backrest cushion (30) provided on the front side of the support plate (20).

The backrest support plate (20) is made of a resin molded product, and one half of a joint pipe (21) made of a metal such as an aluminum alloy is embedded in a position where the backrest frame (3) is connected. Is stuck to.

This joint pipe (21) is fixed by being insert-molded when the backrest support plate (20) is resin-molded, and resin is not penetrated into the end on the buried side during resin-molding. A cap (21a) for prevention is fitted, and a recess (21b) for preventing slipping out and rotation due to resin entanglement is formed in the peripheral wall portion of the embedded region.

Further, a pin hole (21c) is formed on the rear surface side of the projecting portion of the joint pipe (21).

A backrest cushion mounting recess (22) is formed on the front side of the backrest support plate (20).
The rivet engaging protrusions (2) are protruded forward at four positions on the bottom surface of the recess (22) in the vertical and horizontal positions.
3) (24) are integrally formed.

The rivet engaging projections (2
As shown in FIG. 9A, 3) and (23) are formed in a tubular shape, and have a rivet engaging inner peripheral convex edge (2) at the tip thereof.
Rivet engagement holes (23a) and (23a) are formed so as to be surrounded by 3b) and (23b). The rivet engaging hole (23a) is provided with a rivet engaging inner peripheral edge (23a).
The b) is formed so as to become thinner toward the inner diameter direction, so that it is formed in the countersink.

The rivet engaging protrusions (24) and (24) at the left and right sides are formed with elliptical plate-like tips at the tips of the protrusions, as shown in FIG. 9B. A rivet engaging hole (24a) surrounded by the inner peripheral convex edge (24b) is formed. The engagement hole (24
A) is also formed in the countersink like the above.

In FIG. 7, (25) is a rib integrally formed with the backrest support plate (20), and (26) is integrally formed with the backrest support plate (20) to provide a back cushion (30). It is a cylindrical spacer portion for abutting against and maintaining a distance from it.

On the other hand, the back cushion (30) has a plywood core plate (31) formed in a curved shape, following the backrest support plate (20). Core plate (31)
At the upper, lower, left and right positions of the rivet engaging projection (2
Four rivet setting holes (33) and (34) are formed corresponding to 3) and (24), respectively.

These rivet setting holes (33) (34)
The rivets placed on the rivets are special resin rivets called Christmas rivets, Christmas clips, etc. (4
0) is used. That is, this rivet (40)
As shown in FIG. 10, a large number of elastic fin pieces (45) are integrally formed on the outer peripheral surface of the shaft portion (41) in a dense arrangement along the axial direction, and the rivet (4
0) has its shank (41) with rivet setting holes (33) (3
4) It is inserted into the core plate and protrudes to the back surface side of the core plate, and the peripheral edge portion of the head portion (42) is locked to the peripheral edge portions of the rivet setting holes (33) (34) on the front surface side of the core plate (31). It is located in.

The rivet setting holes (33) (34)
Are formed in so-called foolish holes, that is, the diameters of the rivet setting holes (33) and (34) are different from those of the rivet (4).
The rivet (40) is formed to be much larger than the diameter of the shaft portion (41) of (0) so that the rivet (40) can be slightly moved in the radial direction orthogonal to the shaft portion (42).

On the front surface of the core plate (31), rivets (4
The rivet holding sheet piece (35) is attached by tacking or adhering so as to cover the head (42) of (0).

Further, a cushion material (36) is arranged on the front side of the core plate (31), and a covering sheet (37) is arranged so as to cover the cushion material (36), and the covering sheet (37). ) Is fixed to the back side peripheral edge of the core plate (31) by tacking, thereby forming a back cushion (30).

Back cushion (30) of this construction
2 and 3, the rivet (40) is attached to the backrest support plate (20) by engaging the rivet engaging holes (23a) and (24a) with each other. That is, the back cushion (30) is attached to the back cushion supporting recess (2) on the front side of the back support plate (20).
2), and the rivet installation position of the back cushion (30) is pushed into the backrest support plate (20) side.
At this time, first, the rivet (40) is lightly pushed in to move the rivet shaft portion (41) into the rivet engaging holes (23a) (24).
a) A small amount is inserted into the inside of a), and at a relatively shallow position, the elastic fin pieces (45) (45) of the rivet shaft portion (40) are prevented from coming off from the inner peripheral convex edges (23b) (24b) of the inner peripheral edge portion of the rivet engaging hole. Engagement to form a temporary stop for the back cushion (30). In the temporarily fixed state, it is confirmed whether or not there is any problem. If there is no problem, the rivet (40) is strongly pushed into the backrest support plate (20) side, and the rivet shaft portion (41).
Is deeply inserted into the rivet engaging holes (23a) (24a),
At that position, the elastic fin piece (45) is engaged with the rivet engaging inner peripheral convex edges (23b) and (24b) in a retaining manner to perform final fixing.

At the time of this fixing, since the rivet setting holes (33) (34) of the core plate (31) are formed to have a large diameter (dumb hole), the rivet (40) and the rivet engaging hole (23).
a) (24a), even if there is some dimensional error in the direction orthogonal to the axial direction, the rivet (4
Since 0) moves so as to absorb the error, the rivet (40) can be reliably engaged.

On the other hand, in the backrest (10) assembled in this way, as shown in FIG. 5, the joint pipes (21) (21) at both sides are inserted into the upper ends of the pair of backrest frames (3) (3). Further, as shown in FIG. 6, a connecting pin (6) such as a blind rivet is inserted and fixed in the pin hole (3c) formed in the backrest frame (3) and the pin hole (21c) of the joint pipe (21). Backrest frame (3) and joint pipe (2
Connect with 1).

As a result, the backrest (10) is attached to the backrest frame (3), and the chairs are set up in the set.

According to this embodiment, the back cushion (30) is arranged on the front side of the support plate (20) and the rivet mounting position of the back cushion (30) is set to the support plate (2).
If the rivet (40) is engaged by pushing it to the (0) side, the back cushion (30) and the support plate (20) can be easily connected.

Further, the rivet engagement holes (23a) (24
Since (a) is a countersink, the inner peripheral convex edge of the inner peripheral edge of the engaging hole is formed thin, and the rivet (4) is formed on the thin inner peripheral convex edge.
Since the elastic fin piece (45) of 0) can be engaged, it is possible to surely prevent a defect due to poor engagement, for example, a problem in which the back cushion (30) is unintentionally peeled off.

Further, as the rivet (40), a large number of elastic fin pieces are formed on the outer peripheral surface of the shaft portion in a dense arrangement along the axial direction, and therefore, on the shaft portion (41). The rivet (40) can be engaged at any position, and the rivet can be engaged at a reasonable and appropriate pushing position, so that the backrest can be assembled accurately and surely. Further back cushions (3
0) can be fixed at any position in the pushing direction, so that the back cushion (30) can be temporarily fixed in the middle of mounting, and the positioning can be accurately performed in the temporarily fixed state. After reconfirming whether or not the back cushion has been broken, the back cushion (30) can be firmly pushed in to firmly fix it. Therefore, after the main fixing, there is no need for the troublesome work of disassembling and assembling again due to misalignment or the like.

In this embodiment, the back cushion (30) can be easily separated from the support plate (20) by peeling off the back cushion (30) from the back support plate (20). Also in this case, the back cushion (30) and the support plate can be maintained and inspected without any trouble.

Also according to this embodiment, the backrest (10)
Since the joint pipe (21) is fixed to the support plate (20) in advance in an embedded state by insert molding, the joint pipe (21) is inserted into the backrest frame (3) to connect the two together ( The backrest (10) can be easily attached to the backrest frame (3) simply by connecting the backrest (6). Further, since only the joint pipe (21) and the connecting pin (6) are used as the connecting member, the number of parts can be reduced, and the structure can be simplified and the cost can be reduced.

In this embodiment, the joint pipe (2
Since the cap (21a) is attached to the opening end on the embedded side of 1), resin is prevented from entering the joint pie 7 (21) when the support plate (20) is molded, and a good molded product, That is, the backrest support plate (20) can be obtained, and a high quality chair can be manufactured.

Moreover, in a state where the two joint pipes (21) on both sides of the backrest (10) are inserted into the pair of backrest frames (3), the rotational position of the joint pipe (21) with respect to the backrest frame (3) is constant. Therefore, when the joint pipe (21) is inserted, the pin hole (21c) of the joint pipe (21) and the pin hole (3c) of the backrest frame (3) are automatically positioned. Therefore, the work of adapting the pin holes, which requires a high degree of skill, is not required, and also in this respect, the assembling work can be easily performed.

Further, since the joint pipe (21) is attached by insert molding with high positional accuracy and the joint pipe (21) with high positional accuracy serves as a core material, the chair can be assembled with high accuracy and high quality is achieved. Can provide a chair.

11 and 12 are plan sectional views showing a backrest side portion of a folding pipe chair according to a modified example of the present invention, showing portions corresponding to FIGS. 3 and 4 of the above embodiment, respectively. There is.

As shown in both figures, this backrest (11
0) is the same as above, and the backrest support plate (12) made of resin, to which the joint pipe is fixed by insert molding.
0) and a back cushion (130).

Rivet engaging projections (123) (124) are integrally formed at four positions on the back and back cushion mounting recesses (122) of the backrest support plate (120) in the vertical and horizontal directions.

These rivet engaging protrusions (123)
Each of the (124) is configured by a cylindrical member having a longer axial direction than the rivet engaging protrusion (23) at the upper and lower positions of the above-mentioned embodiment, and the inner peripheral convex edge (1
23b) and 124b are provided with countersink-shaped rivet engagement holes (123a) (124a). Further, the rivet engaging protrusion (123) at the upper and lower positions
Of the backrest (110) is aligned with the centerline C1 of the backrest (110) in a plan view, and the axislines C2 of the left and right rivet engaging protrusions (124) are parallel to the backrest centerline C1. Is configured to be placed.

On the other hand, on the front surface side of the core plate (131) of the back cushion (130), the positions corresponding to the above-mentioned four rivet engaging projections (123) (124) are countersunk to install the rivet head. Counterbore part (131a)
And a rivet setting hole (133) (134) having a larger diameter than the rivet engaging protrusions (123) (124) is formed from the center of the bottom surface of the counterbore (131a) to the back side of the core plate. Has been done. The rivet setting holes (133) and (134) are configured such that the axis C2 thereof is parallel to or coincides with the backrest center line C1 in a plan view.

Further, the rivet (4
0) has its shank (41) with a rivet setting hole (133)
The head (42) when inserted and arranged in the (134)
It is arranged so as to be housed in the counterbore (131a) and to be locked to the peripheral portions of the rivet setting holes (133) (134) on the bottom surface of the counterbore. The rivet (40) thus arranged is configured such that its axis C2 is parallel to or coincides with the backrest centerline C1 in a plan view.

In FIGS. 11 and 12, (1
Reference numeral 25) is a rib which also serves as a spacer for reinforcing the rivet engaging protrusions (123) (124) and the backrest support plate (120) and for maintaining a distance from the backrest cushion (130).

Since the other structure is substantially the same as that of the above-mentioned embodiment, the same or corresponding parts are designated by the same or corresponding reference numerals, and the duplicated description will be omitted.

The back cushion (13 having the above structure
0) is attached to the backrest support plate (120) in the same manner as above. That is, the rivet engaging protrusion (1
23) and (124) are rivet setting holes (133) and (13).
4) The back cushion (130) is superposed on the front surface of the backrest support plate (120) so as to be inserted into the inside, and the rivets (40) are pushed into the rivet engaging protrusions (123) (124), respectively. (40)
The shaft portion (41) of the rivet engaging hole (123a) (124
a), and the inner peripheral convex edge (123b) (124)
The elastic fin piece (45) is engaged with b) in a retaining manner to connect the back cushion (130) and the support plate (120).

In this modification, in addition to the effects of the above embodiment, rivet setting holes (133) (134) are further provided.
Since the rivet engaging protrusions (123) and (124) are inserted into the inside, the rivet setting hole (13)
3) The protrusion dimension of the rivet engaging protrusions (123) and (124) can be increased by the depth dimension of (134). Therefore, the engaging hole (12) of the rivet (40)
3) A sufficiently large amount of fitting into the (124) can be secured, and even if there is a slight dimensional error in the axial direction, the dimensional error can be absorbed and the rivet (40) can be reliably engaged. You can

Further, when the back cushion (130) is overlaid on the support plate (120), the rivet engaging projections (123) (124) are provided with rivet setting holes (13).
3) Since the back cushion (130) is positioned with respect to the support plate (120) by being inserted into (134), the backrest assembling work can be performed more accurately and easily.

Further, by performing the counterbore treatment, the amount of protrusion of the rivet head (42) from the front surface of the core plate (131) is reduced, and after the chair is assembled, the seated person feels a hard feeling of the rivet head (42). It is possible to provide a comfortable chair that is comfortable and comfortable for the seated person.

By the way, in the backrest (10) of the embodiment shown in FIG. 4, the axis line C3 of the rivets (40) at both sides forms a predetermined angle with respect to the centerline C1 of the backrest, and the backrest cushion (30). ) And the engaging direction of each rivet (40) are different, an operator with a low degree of skill may not be able to grasp the pushing direction of the rivet (40) quickly and accurately, resulting in deterioration of workability. There is a risk of coming. On the other hand, the backrest (11
0), the rivet (40) is arranged with its axis C2 parallel to the backrest centerline C1, as shown in FIGS.
Since the stacking direction of 30) and the engaging direction of each rivet (40) are the same direction, even a worker with a low degree of skill will not make a mistake in the pushing direction of the rivet (40), and The backrest can be assembled more easily.

In the present invention, the rivet mounting position and the number of mounted rivets are not particularly limited.

[0057]

As described above, according to the backrest mounting structure of the pipe chair of the present invention, the backrest support plate is insert-molded at a position where the backrest support plate is connected to the backrest frame, and a part of the metal joint pipe is fixed in an embedded state. Since it is composed of a molded resin product, the backrest can be easily replaced with the backrest frame by inserting the protruding part of the joint pipe into the upper end of the backrest frame and connecting the joint pipe and the backrest frame with connecting pins. Can be installed. Further, since only the joint pipe and the connecting pin are used, the number of parts is small, and the structure can be simplified and the cost can be reduced.

Moreover, when the two joint pipes fixed to both sides of the backrest are inserted into the pair of backrest frames, the rotational position of the joint pipe with respect to the backrest frame is constant. In the rotational direction, for example, the pin holes of the joint pipe and the pin holes of the backrest frame are automatically positioned. Therefore, there is no need for the pin hole fitting work, which requires a high degree of skill, and also in this respect, the backrest mounting work can be easily performed.

Further, since the insert-molded joint pipe serves as the core material, the assembling precision can be kept high and a high quality chair can be provided.

In the present invention, in the case of adopting the constitution in which the cap for closing the opening of the end is attached to one end on the buried side of the joint pipe, the invasion of the resin into the joint pipe at the time of molding the backrest support plate. Has the advantage that a good molded product, that is, a backrest support plate can be obtained, and a high-quality chair can be provided.

[Brief description of drawings]

FIG. 1 (a) is a front view showing a folding pipe chair to which a backrest mounting structure according to an embodiment of the present invention is applied, and FIG. 2 (b) is a side view showing the folding pipe chair.

FIG. 2 is a perspective view showing a side portion of a backrest of the chair of the embodiment with a backrest cushion separated.

FIG. 3 is a plan cross-sectional view showing a side portion of a backrest in an embodiment with a backrest cushion separated.

FIG. 4 is a plan sectional view showing a side portion of a backrest according to an embodiment.

FIG. 5 (a) is a front sectional view showing a backrest of the embodiment separated from a backrest frame, and FIG. 5 (b) is a front sectional view showing the backrest connected to a backrest frame.

FIG. 6 is a perspective view showing a joint pipe embedded in the backrest of the embodiment.

FIG. 7 is a front view showing a backrest support plate in the chair of the embodiment.

FIG. 8 is a rear view showing the back cushion of the chair of the embodiment.

9 is a perspective view showing a rivet engaging protrusion formed on the backrest support plate of the embodiment, and FIG. 9 (a) is a perspective view showing the rivet engaging protrusions located in the upper and lower parts of the center. (B) is a perspective view showing the rivet engaging protrusions located on both sides.

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

FIG. 11 is a plan cross-sectional view showing a side portion of a backrest in a modified example of the present invention with a backrest cushion separated.

FIG. 12 is a plan sectional view showing a side portion of a backrest in a modified example.

[Explanation of symbols]

 3 ... Back frame 4 ... Seat 6 ... Connecting pin 10, 110 ... Back 20,20 ... Back support plate 21 ... Joint pipe 21a ... Cap 30, 130 ... Back cushion

Claims (2)

[Claims] 1. A backrest mounting structure for a pipe chair, wherein a backrest comprising a backrest support plate and a backrest cushion mounted on the front surface thereof is mounted on a pair of left and right metal pipe backrest frames extending parallel to each other above the seat body. The backrest support plate is constituted by a resin molded product in which a part of a metal joint pipe is fixed in an embedded state by insert molding at a connection position with the backrest frame, and a protruding portion of the joint pipe is formed on the backrest frame. A backrest mounting of a pipe chair, characterized in that the joint pipe and the backrest frame are connected to each other by a connecting pin penetratingly provided to the joint pipe and the backrest, and the backrest is attached to the backrest frame. Construction. 2. The backrest mounting structure for a pipe chair according to claim 1, wherein a cap that closes the opening of the end is attached to one end of the joint pipe on the buried side.