JP2915153B2 - Terminal forming method for motorcycle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat for a motorcycle or a tricycle such as a motorcycle, a buggy, a jet ski, a snowmobile and the like, and more particularly to a method for forming a terminal of a seat for a motorcycle or a motorcycle having an improved seat terminal.

[0002]

2. Description of the Related Art In general, foamed urethane foam used as a cushioning material for motorcycle seats is foamed substantially similarly not only at a seating portion, which is a main body of the cushioning material, but also at a terminal portion of the cushioning material. . That is, the sheet end portion of the foaming mold 70 composed of the upper and lower molds as shown in FIG. 7 is formed by forming a cavity having the shape of the sheet end portion in the lower mold 71 and clamping with the upper mold 72. Therefore, both the main body and the terminal portion of the cushion material K are formed softly. For this reason, when the skin material is covered on the bottom plate and assembled, the shape of the sheet end portion is sagged or distorted. In order to solve such inconvenience, conventionally, as shown in FIG. 7, a hardened portion is formed at the terminal portion of the cushion material K by interposing an impregnating material 73 or by inserting another insert. Further, a hardening portion is provided by applying an antifoaming agent such as silicon il to a foaming mold to suppress foaming.

In assembling the seat, the vehicle body side member 7
As shown in FIG. 8, the vehicle body-side member 74 is provided to prevent the abnormal noise from being generated due to the contact of the bottom plate 4 with the bottom plate B.
The interference member 75 is disposed between the seat member and the seat terminal. In addition, the symbol H in FIG. 8 is a skin material, K is a cushion material, B
Is a bottom plate.

[0004]

In the above prior art, in order to form a hardened portion of the terminal portion, an impregnating material is interposed, a separate insert is inserted, or an antifoaming agent such as silicon yl is applied to a foaming mold. In addition, there is a problem in mass production efficiency with an increase in the number of used members and the number of manufacturing steps, such as disposing an interference material for preventing generation of abnormal noise with the vehicle body.

It is an object of the present invention to form a cured portion at a terminal portion by a mold structure without interposing an impregnating material, inserting a separate product, or applying a defoamer such as silicon il to a foam mold. Another object of the present invention is to provide a method for forming a terminal portion of a two- or three-wheeled vehicle seat in which the cured portion is assembled as a terminal portion.

[0006]

According to the present invention, there is provided a method for forming a terminal portion of a two- or three-wheeled vehicle seat according to the present invention, comprising the steps of: forming a cushion material having a terminal portion formed by a foaming die comprising an upper die and a lower die; A method for forming a terminal portion of a motorcycle seat joined to a skin material and a bottom plate using the cushion material, wherein the cushion material is connected to a terminal portion forming portion of a seat-shaped cavity, and a slight gap is formed between the upper and lower molds. The formed partition surface, a liquid reservoir portion of a predetermined shape continuous with the partition surface, is formed by a foaming die formed, a connecting portion is formed on the partition surface of the foaming mold, in the liquid reservoir portion,
A hardened portion is formed, and a hardened portion formed by the liquid pool portion is bent toward a terminal portion side of the cushion body side by a connecting portion formed by the partition surface to form a terminal portion of the cushion material, and the cushion portion is formed. It is characterized in that the end portion of the material is sandwiched between a skin material and a bottom plate.

[0007]

In general, the hardness of a soft urethane per unit density is determined by its prescription, so that the higher the density in the same prescription, the harder it becomes. As the overpack and density (weight) increase, the hardness further increases. The same can be said for an extremely high density portion such as a skin layer. The hardness of the skin layer is the same as that of the non-foamed state (about 1 g).
/ Cm3) shows the highest value. When foaming occurs in the upper and lower molds with a partition surface having a slight gap formed therebetween and a mold having a liquid reservoir portion of a predetermined shape continuous with the partition surface, burrs are generated at the positions of the partition surfaces. When this burr occurs, the uncured foam in the vicinity, due to the flow rate of the burr,
The crushing causes the density to rise, and the reaction does not generate heat, so that the temperature does not rise. When the temperature is low, the foaming reaction is less likely to occur chemically, and a hardened layer is formed more and more.

As described above, according to the present invention, the hardened connecting portion and the hardened portion are positively formed by the partition surface and the liquid pool portion, and the hardened portion formed by the liquid pool portion is formed by the connecting portion. The cushion material is bent toward the main body to form a terminal portion of the cushion material. Then, the end portion of the cushioning material is formed by being sandwiched between the skin material and the bottom plate.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 5 show an embodiment of the present invention. As shown in FIG. 5, the motorcycle S seat S according to the present invention has a cushion material K placed on a bottom plate B and covered with a skin material H. Code 19
Is a vehicle body side member. And cushion material K is upper mold 11
And the lower mold 12 is formed by the foaming mold 10,
The molding in this example is performed by a foaming mold as shown in FIGS.

That is, the foaming mold 10 is composed of a lower mold 12 and an upper mold 11, and the lower mold 12 is formed with a cavity formed by a sheet-shaped concave portion 13.
Is formed with a terminal portion forming portion (terminal portion) 14 of the cushion material K. A projection 15 as a partition surface is provided around the lower die 12 near the upper die 11 so as to be continuous with the terminal portion forming portion 14 of the lower die 12.
A slight gap 16 is formed between the protrusion 15 of the lower mold 12 and the upper mold 11, and a liquid reservoir 17 having a predetermined shape is formed in communication with the gap 16. This gap is about 0.1 mm to 2.0 mm. The liquid reservoir 17 has a slightly smaller space in the left-right direction of the sheet that is substantially aligned with the projection 15 serving as the partition surface. In the front-rear direction of the sheet, the front-rear portion of the sheet has a round shape. Therefore, they are formed at predetermined intervals as shown in FIG. The sealing surface 18 of the mold clamping
The gap between the upper and lower dies can be set in a range of 0 to 0.1 mm, and burrs generated in this range can be used for bending and joining described later.

In general, as the moving speed of the foaming liquid or the moving amount of the foaming liquid increases, the foam disappears on the surface of the urethane foam, and a hardened layer having a high density is formed. Therefore, by arbitrarily setting the size (capacity) of the liquid pool and the thickness of the partition surface (projection) formed at the end of the cushion, the moving amount and speed of the foaming liquid are controlled, and The thickness can be adjusted freely.

As shown in FIG. 3 and FIG. 4, the terminal portion of the cushion material K formed by the foaming mold 10 has a hardened connecting portion 21 formed at the protrusion (partition surface) 15. A hardened portion 22 slightly smaller than the portion (partition surface) 15 is formed in the space of the liquid pool portion 17. Then, the hardened portion 22 formed by the liquid pool portion 17 is bent and adhered to the cushion material K side terminal portion 14 side having high cushioning property at the connecting portion 21 formed by the projection portion (partition surface) 15. Form a terminal. At this time, the sealing surface 1
Preferably, burrs generated by 8 are used for joining.

FIG. 6 shows another example of assembly of the present invention. In this example, the end of the bottom plate is formed by a hardened portion formed by a liquid reservoir of a cushion material and a partition surface. It is covered with the connecting portion and joined to the skin material. According to the present embodiment, the hardened portion formed by the liquid pool can function as an interference material with a pipe or the like on the vehicle body side.

[0015]

As described above, since the hardened portion is formed in the cushion end portion, it is possible to prevent sagging and distortion during assembly. In addition, since the cured part is formed simultaneously with foaming and without the need of an insert, etc., there is no need to use a special foaming liquid, and it is inexpensive, and the liquid reservoir is used as an interference material after mounting. As a result, the buffer cushion, urethane slab, and the like can be eliminated.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a foaming mold used for forming a terminal portion of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an explanatory diagram showing a forming state before assembling a terminal unit.

FIG. 4 is a plan view of the terminal section showing a state where the terminal is removed.

FIG. 5 is a transverse sectional view showing an assembled state.

FIG. 6 is a cross-sectional view showing another example of assembly.

FIG. 7 is an enlarged sectional view of a main part, similar to FIG. 2, showing a conventional example.

FIG. 8 is a cross-sectional view showing a conventional example in an assembled state.

[Explanation of symbols]

 Reference Signs List 10 foaming mold 11 upper mold 12 lower mold 13 concave part (cavity) 14 terminal part of cushion material (terminal part forming part) 15 partition surface (projection part) 16 gap 17 liquid pool part (space) 21 connecting part 22 curing part B bottom Plate H Skin material K Cushion material S Motorcycle seat

Claims (1)

(57) [Claims] 1. A method for forming a terminal portion of a two- or three-wheeled vehicle seat formed by a foaming die including an upper die and a lower die and having a terminal portion, and using the cushion material to join a skin material and a bottom plate. The cushioning material is continuous with a terminal portion forming portion of the sheet-shaped cavity, a partition surface having a slight gap formed in the upper and lower molds, and a liquid reservoir having a predetermined shape continuous with the partition surface. Are formed by a foaming mold formed respectively, a connecting portion is formed at a partition surface of the foaming mold, a hardening portion is formed at the liquid pool portion, and a hardened portion formed by the liquid pool portion is partitioned by the partitioning portion. At the connecting portion formed by the surface, bent to the terminal portion side of the cushion body side to form a terminal portion of the cushion material,
A method for forming a terminal portion of a two- or three-wheeled vehicle seat, wherein a terminal portion of the cushion material is formed by sandwiching the terminal portion between a skin material and a bottom plate.