JP2002303307A - Method for joining chair member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and reliably join members with each other by using an engagement pin. SOLUTION: In a method for joining chair members in which a first member 1 having a shaft hole 3 overlaps a second member 2 having an engagement hole 4 at a part corresponding to the shaft hole 3 by the engagement pin 5 comprising a base end 5a, a forward end part 3b and a fin 8, the engagement hole 4 having the diameter smaller than the outside diameter of the fin 8 is formed in the second member 2, the shaft hole 3 having the diameter larger than the inside diameter of the engagement hole 4 is formed in the first member 1, the forward end part 3b is press-fitted into the shaft hole 3 until the base end 5a of the fin 8 is brought into contact with the first member 1, the engagement pin 5 is fixed to the first member 1, and the forward end part 3b of the engagement pin 5 fixed to the first member 1 is press-fitted in the engagement hole 4 to join the first member 1 with the second member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining chair members suitably used for joining a back plate of a chair holding a cushion to a back plate, for example.

[0002]

2. Description of the Related Art Conventionally, for example, when a back plate of a chair for backing up a cushion and a back back plate arranged on the back of the back plate are joined together, a shaft hole is formed in the back back plate. An engagement hole is provided in a portion of the back plate corresponding to the shaft hole. Then, an engaging pin having a locking flange at the base end is inserted into the shaft hole from the back side of the back back plate, and its distal end is projected to the front surface of the back back plate. The back and the periphery are wrapped with an exterior material such as cloth to adjust the appearance. In this state, the back plate is superimposed on the front surface of the back plate, and the back plate and the back plate are joined by engaging the tips of the engagement pins with the engagement holes. .

[0003]

By the way, in such a structure, engaging pins are passed through a plurality of positions of the back plate, and each engaging pin is inserted into a corresponding engaging hole of the back plate. Because of the engagement, each engagement pin is loosely fitted into each shaft hole relatively loosely to prevent the engagement pin from being able to be properly engaged with the engagement hole due to a dimensional error. ing.

[0004] For this reason, during the so-called case work for mounting the exterior material, the engaging pin tends to fall out of the shaft hole, and at the time of assembling, the engaging pin moves in the axial direction to make the assembling work difficult. There was a problem.

[0005] Such a disadvantage can be solved by stopping the engaging pin penetrating the shaft hole by using a so-called speed nut or the like. In addition to increasing the complexity, the number of steps for assembling the engagement pins also increases.

An object of the present invention is to solve such a problem.

[0007]

The present invention employs the following method to achieve the above object.
That is, the method for joining members of a chair according to the present invention includes a first member having a shaft hole, and a second member having an engagement hole at a portion corresponding to the shaft hole, the base end and the distal end of which are provided. In a joining method of a chair member that is overlapped by an engaging pin formed of a fin, an engaging hole smaller than an outer diameter of the fin is formed in the second member, and an inner diameter of the engaging hole is formed in the first member. After forming a larger shaft hole, the tip portion is press-fitted into the shaft hole until the base end of the fin contacts the first member, and the engaging pin is fixed to the first member. 1
The tip of the engaging pin fixed to the member is press-fitted into the engaging hole to join the first member and the second member.

In particular, after fixing the engagement pin to the first member, before pressing the tip of the engagement pin into the engagement hole of the second member, the back surface of the first member is removed. It is desirable to cover with an exterior material.

With such a configuration, even if the inner diameter of the shaft hole is set relatively large with respect to the outer diameter of the engaging pin, it is possible to prevent the engaging pin from accidentally falling off. Becomes possible. Therefore, there is no need to hold down the engaging pin so that it does not come off during the casework operation, or to restrain the engagement pin from rattling during the assembly operation. That is, once the engagement pin is driven into the shaft hole, the engagement pin does not drop out unless a large reverse pressing force is applied, so that handleability in case work or the like is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In this embodiment, the present invention is applied to a portion where a back plate 1 as a first member constituting a backrest portion of a chair and a back plate 2 as a second member for backing up a cushion are joined. Is the case.

The back back plate 1 is a flat plate that is joined to the back surface 2a of the back plate 2 in a superposed state, is made of plywood or the like, and has, for example, four shaft holes 3 at four locations. The shaft hole 3 is
Circular, front surface 1b, which is the joining surface of back surface 1a of back plate 1
It is pierced to communicate with.

The back plate 2 is a flat plate supporting the back of the cushion, made of plywood or the like, and has circular engagement holes 4 at four locations corresponding to the shaft holes 3.

The back plate 1 and the back plate 2 are connected to each other by using an engaging pin 5 penetrating the shaft hole 3. As shown in FIGS. 1 to 4, the engaging pin 5 has a locking flange 6 at a base end 5 a and a distal end 5 b is passed through the shaft hole 3 of the back back plate 1 to join the back back plate 1. It protrudes toward the front surface 1b, which is a surface, and is integrally molded of synthetic resin. The locking flange 6 has a flat disk shape and has an outer diameter larger than that of the shaft hole 3. The tip portion 5b has a core portion 7 having a cross-shaped cross section.
And fins 8 formed so as to fill the corners of the core portion 7. The fins 8 are formed in a plurality of steps at predetermined intervals in the axial direction. The diameter of the virtual circle 81 connecting the tips of the fins 8 is
Is set slightly larger than the inner diameter of. The intermediate portion 5c of the engagement pin 5, which is located in the shaft hole 3 in the mounted state,
It has a cylindrical shape smaller in diameter than the shaft hole 3. And
An elastic piece 9 for retaining is integrally formed at a boundary portion between the intermediate portion 5c and the tip portion 5b. The elastic piece 9 has a square shape in which four corners 9a are formed into a round shape, and the diameter of the virtual inscribed circle 91 substantially matches the outer diameter of the intermediate part 5c.
The diameter of the virtual circumscribed circle 92 is set to be larger than the inner diameter of the shaft hole 3.

As shown in FIG. 5, the engaging pin 5 is attached to the back plate 1 by driving the shaft hole 3 from the back surface 1a side of the back plate 1. The elastic piece 9 temporarily elastically deforms in the thickness direction and passes through the shaft hole 3, and returns to its original shape in the mounted state as shown in FIG. 6 and engages with the opening end face 3 a of the shaft hole 3. It has become.
FIG. 6 shows the engagement pin 5 shown in FIG. 5 rotated 90 degrees, and the imaginary line shows the elastic piece 9 corresponding to the state shown in FIG.

In this state, an exterior material 10 such as a decorative cloth is covered on the back surface 1a of the back back plate 1 and a peripheral edge (not shown). 4 and the back plate 2 and the back plate 1
And are joined in a polymerization state. The inner diameter of the engagement hole 4 is a virtual circle 81 connecting the tips of the fins 8 of the engagement pin 5.
7, the distal end of the fin 8 is engaged with the engaging hole 4 when the engaging pin 5 is pressed in as shown in FIG.

With this structure, when the engaging pin 5 is inserted into the shaft hole 3 provided in the back plate 1, the elastic piece 9 provided on the engaging pin 5 is temporarily resilient. Shaft hole 3
At the end of the passage, the shape is restored to the original shape, and the opening end surface 3a of the shaft hole 3 is engaged. Therefore, even if the inner diameter of the shaft hole 3 is set to be relatively larger than the outer diameter of the engaging pin 5, it is possible to prevent the engaging pin 5 from being accidentally dropped. Therefore, there is no need to hold down the engaging pin 5 so that it does not come off during the case work or restrain it so that it does not rattle during the assembly work.
That is, once the engagement pin 5 is driven into the shaft hole 3, the engagement pin 3 does not drop out unless a large reverse pressing force is applied, so that handleability in case work or the like is improved. The back plate 1 is formed by the locking flange 6 and the elastic piece 9.
To prevent the engaging pin 5 from moving in the axial direction, thereby facilitating the assembling work.

Note that the engagement holes provided in the second member are not limited to those in the illustrated embodiment. For example, FIG.
May be as shown in FIG. That is, in this embodiment, the synthetic resin plate 12 is provided on the back plate 102 or the like as the second member.
0 is fixed. The central portion 12 of this synthetic resin plate 120
A boss 121 is integrally provided in Oa, and an engagement hole 104 is formed at the center of the boss 121. The engagement hole 104 has a tapered shape that expands rearward, and has a smallest diameter at the back portion 104a. And
The distal end portion 105a of the engaging pin 105 is press-fitted into the inner portion 104a to engage therewith.

With such a configuration, the number of components is larger than that of the above embodiment, but since the engaging hole 104 of the back plate 102 has a tapered shape that expands rearward, The work of press-fitting the engaging pin 105 into the engaging hole 104 is facilitated, and the inner portion 104 a of the engaging hole 104 has the smallest diameter. It becomes difficult to come off by engaging with the portion 104a.

The application of the present invention is, of course, not limited to the joining between the back plate and the back plate of the chair.

In addition, various modifications can be made without departing from the spirit of the present invention.

[0022]

According to the present invention having the above-described structure, it is not necessary to press the engaging pin so that it does not come off during the case work, or to restrain the engaging pin from rattling during the assembly work. That is, once the engagement pin is driven into the shaft hole,
Unless a large reverse pressing force is applied, the engaging pin does not drop out, so that handleability in case work and the like is good and assembly work is easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is an enlarged front view showing the same embodiment.

FIG. 3 is an enlarged left side view showing the embodiment.

FIG. 4 is an enlarged sectional view taken along line AA in FIG. 2;

FIG. 5 is an operation explanatory view of the embodiment.

FIG. 6 is an operation explanatory view of the embodiment.

FIG. 7 is a sectional view showing a use state of the embodiment.

FIG. 8 is a sectional view corresponding to FIG. 6, showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st member (back back plate) 1a ... Back surface 1b ... Front surface (joining surface) 2, 102 ... 2nd member (back plate) 2a ... Back surface 3 ... Shaft hole 3a ... Open end surface 4, 104 ... Engagement Holes 5, 105: engaging pin 5a: base end 5b, 105b: distal end 6: locking flange 9: elastic piece

 ──────────────────────────────────────────────────続 き The continuation of the front page F term (reference) 3B084 EC02 3J024 AA50 CA13

Claims (2)

[Claims] 1. A first member having a shaft hole and a second member having an engagement hole at a portion corresponding to the shaft hole are overlapped with an engagement pin comprising a base end, a tip end, and a fin. In the method of joining chair members, an engaging hole smaller than the outer diameter of the fin is formed in the second member, and a shaft hole larger than the inner diameter of the engaging hole is formed in the first member. After press-fitting the distal end of the fin into the shaft hole until the base end of the fin contacts the first member and fixing the engagement pin to the first member, the engaging member fixed to the first member is formed. A joining method of a chair member, wherein a front end portion of a mating pin is press-fitted into the engagement hole to join the first member and the second member. 2. The method of joining chair members according to claim 1, wherein after fixing the engaging pin to the first member, a back surface of the first member is covered with an exterior material.