JPH06292619A - Cushion fitting structure - Google Patents

Abstract

PURPOSE:To improve position dimension precision at the part of engaging the fitting wire of a cushion and the engaging part of a shell. CONSTITUTION:Recessed parts 11 and 12 are formed at plural parts on the rear face of a cushion 1, the fitting wires are embedded inside the cushion 1 so as to be passed inside the respective recessed parts 11 and 12, engaging wire parts 14a and 14b of those fitting wires positioned at the respective recessed parts 11 and 12 are engaged with engaging parts 3 and 4 provided on the inner face of the shell, and the cushion 1 is mounted to the shell. Then, the directions of respective engaging wire parts 14a and 14b are set so that cores Na and Nb of all the engaging wire parts 14a and 14b can be included in two parallel virtual planes Pa and Pb.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion mounting structure applied to a chair or the like used in an office.

[0002]

2. Description of the Related Art Conventionally, as this type of cushion mounting structure, recesses are formed in a plurality of places on the back surface of the cushion, and mounting wires are embedded inside the cushion so as to pass through the recesses. It is known that an engaging wire portion located in each recess of the attachment wire is elastically engaged with a bifurcated engaging portion provided on the inner surface of the shell to attach the cushion to the shell.

By the way, in the prior art, the engaging wire portions of the mounting wire are oriented in the recesses so as to be substantially parallel to the inner surface of the facing shell.

[0004]

However, the backrest and the seat shell of a recent chair generally have a complicated three-dimensional curved surface in view of the external design and functional requirements. Therefore, in the case where the engaging wire portions are oriented substantially parallel to the facing surfaces of the shell, the engaging wire portions are three-dimensionally inclined, which makes it difficult to set a constant reference plane. Become. Therefore, not only the design of a press die for press-forming this attachment wire becomes complicated, but also it is difficult to accurately measure and inspect the dimensions of each portion of the attachment wire formed by the die. Further, also in the injection molding of the shell, the position and the direction of the engaging portion become three-dimensional, and the design of the molding die becomes complicated. Therefore, in order to accurately engage all the engaging wire rod portions of the mounting wire rod with all the engaging portions of the shell, a large number of man-hours and high accuracy are required in the mold design process, the product inspection process, and the like. There is.

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

[0006]

The present invention takes the following means in order to achieve such an object. That is, in the cushion mounting structure according to the present invention, recesses are formed at a plurality of positions on the back surface of the cushion, and mounting wires are embedded inside the cushion so as to pass through the recesses. The engaging wire rod portion located in the recess is engaged with the engaging portion provided on the inner surface of the shell, and the cushion is mounted on the shell. The direction of each engaging wire rod portion is set so that it can be included in the virtual plane or the plurality of parallel virtual planes.

[0007]

With such a structure, the engaging wire rod portion of the mounting wire rod only needs to two-dimensionally determine its direction within the reference plane, so that the design of the press die becomes simple. . Also, if the axes of all the engaging wire rods are set to be included in a single virtual plane, all the engaging wire rods of the actually press-formed mounting wire rods should be used as a reference for a surface plate, etc. It can be placed on a surface, and its dimensional accuracy can be easily measured. Even when the engaging wire portions belong to a plurality of imaginary planes, the dimensional error and the like can be easily known by measuring the height difference with reference to the surface plate or the like. Therefore, the initial setting of the press die and the inspection at the time of mass production can be performed more easily and more accurately than the conventional one. Furthermore, since the position of the engaging portion of the shell can be determined on the basis of the virtual plane, it is possible to more easily design and manufacture a molding die with high positional accuracy of the engaging portion.

As described above, according to the present invention, the engagement position between the attachment wire of the cushion and the engagement portion of the shell can be determined without using a positioning calculation or measurement method along a complicated three-dimensional curved surface. Therefore, the assembling accuracy of the cushion and the shell can be easily improved.

[0009]

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

FIG. 1 is an exploded view of a back portion of a chair, which comprises a cushion 1 and a shell 2. Then, the recesses 11, 1 are formed in the back surface 1a of the cushion 1 at a plurality of locations.
2, the mounting wire 14 is embedded inside the cushion 1 so as to pass through the recesses 11 and 12, and the engaging wire 14a located in the recesses 11 and 12 of the mounting wire 14. , 14b on the inner surface 2a of the shell 2
The engaging portion 3, 4 provided on the
Is attached to the shell 2.

More specifically, the cushion 1 is integrally formed by using urethane foam or the like as a material, and as shown in FIG. 1, an upholstery material 16 is attached to the peripheral portions of the front surface and the back surface thereof. . As shown in FIG. 2, a back surface 1a of the cushion 1 is formed with a pair of left and right recessed portions 11 located on the upper end side and a pair of left and right recessed portions 12 located on the lower end side. For example, a metal mounting wire 14 having a circular cross section is embedded. The mounting wire 14 is shown in FIG.
As shown in FIG. 1, the metal wire material is formed into an annular shape and the ends thereof are joined by welding. As shown in FIGS. 1 and 2, a pair of engaging wire portions 14a are formed in the recesses 11, respectively. While being positioned, the pair of engaging wire portions 14
b are located in the recesses 12, respectively. The engaging wire rod portions 14a and 14b are formed by forming a straight line in the middle of the attachment wire rod 14 by a certain length. As shown in FIGS. The center Na is oriented so as to be included in the first virtual plane Pa, and
The pair of engagement wire portions 14b are oriented such that the axis Nb thereof is included in a second virtual plane Pb parallel to the virtual plane Pa.

The shell 2 is made of, for example, a synthetic resin attached to the upper end of a metal back support rod 5, and as shown in FIG. 1, a large number of reinforcing ribs 21 project integrally on its inner surface 2a. It is set up. A first bifurcated engagement portion 3 is integrally projectingly provided on a portion of the shell 2 corresponding to the upper end side concave portion 11, and a second bifurcated engaging portion 3 is provided on a portion corresponding to the lower end side concave portion 12. The bifurcated engagement portion 4 is integrally formed. The first and second bifurcated engagement portions 3 and 4 have notch grooves 32 and 42 for holding the attachment wire 14 at the tips of the upstanding walls 31 and 41, respectively, as shown in an enlarged manner in FIG. I will do it. Notch grooves 32, 4
2, the bottom portions 32a and 42a have a width substantially corresponding to the diameter of the attachment wire rod 14, the opening ends 32b and 42b have an opening width larger than that of the attachment wire rod 14, and the middle portions 32c and 4a.
2c has a width dimension slightly smaller than the diameter of the attachment wire 14, and at the opening edges of the cutout grooves 32, 42, cylindrical ribs 33, 43 and a guide rib 34 expanding outward are provided. Four
4 are integrally formed. Then, when the engaging wire rod portions 14a and 14b of the attachment wire rod 14 are pushed into the notch grooves 32 and 42, the notch grooves 32 and 42 temporarily widen due to elastic deformation of the members, and the engaging wire rod portion 14a. , 14b
Engage with the bottom portions 32a, 42a of the cutout grooves 32, 42. Therefore, the axial center Na of the cylindrical rib 33 in the pair of first bifurcated engaging portions 3 is oriented so as to be included in the virtual plane Qa corresponding to the virtual plane Pa, and the pair of second The axial center Mb of the tubular rib 43 in the bifurcated engaging portion 4 is oriented so as to be included in the virtual plane Qb corresponding to the virtual plane Pb. The bottom portions 32 of the cutout grooves 32, 42 in the bifurcated engaging portions 3, 4 corresponding to the engaging wire rod portions 14a, 14b of the mounting wire rod 14, respectively.
The virtual plane Qa coincides with the virtual plane Pa and the virtual plane Qb coincides with the virtual plane Pb in the state of being engaged with the a and 42a.

With such a structure, the engaging wire rod portions 14a and 14b of the mounting wire rod 14 have imaginary planes Pa and
Since it suffices to determine the direction two-dimensionally in Pb, the design of the press die for forming this attachment wire 14 becomes simple. Further, since the engaging wire rod portion 14a on the upper end side is included in the first imaginary plane Pa and the engaging wire rod portion 14b on the lower end side is included in the second imaginary plane Pb, its size can be obtained by using a surface plate or the like. The error can be measured relatively easily. Therefore, the initial setting of the press die and the dimension inspection during mass production can be performed more easily and more accurately than the conventional one. further,
The positions of the engaging portions 3 and 4 of the shell 2 are also the virtual plane Pa,
Since it can be determined with reference to the virtual planes Qa and Qb corresponding to Pb, it is possible to more easily design and manufacture a molding die with high positional accuracy regarding the engaging portions 3 and 4.

Although the cushion mounting portion of the chair back has been described in the above embodiments, the present invention is not necessarily limited to this, and may be applied to a cushion or other mounting portion of the chair seat. The same is applicable.

Further, in the above-described embodiment, the case where the axis of the engaging wire portion of the attachment wire is included in the two virtual planes has been described, but all the axes are included in one virtual plane. May be. Alternatively, when the number of engaging wire rod portions is large, it is possible to have the axis of the engaging wire rod portion included in three or more parallel virtual planes.

[0016]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the engagement position between the attachment wire of the cushion and the engagement portion of the shell can be calculated along with a complicated three-dimensional curved surface and a sophisticated measurement method can be used. It can be determined without using, and the assembling accuracy of the cushion and the shell can be reasonably and reliably improved.

[Brief description of drawings]

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

FIG. 2 is a rear view showing the cushion of the same embodiment.

FIG. 3 is a perspective view showing a mounting wire of the same embodiment.

FIG. 4 is a side view showing the cushion of the same embodiment.

FIG. 5 is an explanatory view showing, in an enlarged manner, an engaging portion of a mounting wire rod in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cushion 2 ... Shell 3 ... Engagement part 4 ... Engagement part 11 ... Recessed part 12 ... Recessed part 14 ... Attachment wire 14a ... Engagement wire part 14b ... Engagement wire part Na ... Shaft center Nb ... Shaft center Pa ... Virtual plane Pb ... virtual plane

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Horiki 5331 Nishi-Shimogawara, Ina City, Nagano Prefecture Furniture Division, Takano Co., Ltd. (72) Tomichi Murakami 2-2 Nakahamacho, Nishinomiya City

Claims (1)

[Claims] 1. A recess is formed at a plurality of positions on the back surface of a cushion, and a mounting wire is embedded inside the cushion so as to pass through the recess, and the engagement is located at each recess of the mounting wire. In the case where the wire rod portion is engaged with the engaging portion provided on the inner surface of the shell and the cushion is attached to the shell, the axes of all the engaging wire rod portions are a single virtual plane, or
A cushion mounting structure, characterized in that the direction of each engaging wire portion is set so as to be included in a plurality of parallel virtual planes.