JPH0357792B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to cushion materials for motorcycles and tricycles, and particularly to cushion materials for motorcycles and tricycles having different hardnesses and a method for manufacturing the same. [Prior Art] Unlike four-wheeled seats, straddle-type seats, such as those found on motorcycles, cannot function as a seat simply by being comfortable. In other words, a riding position is required as an element for maneuvering a motorcycle or tricycle, and the role of the seat is related to this riding position. For example, even if you only do cornering,
It is necessary to take various postures, and when taking these postures, the driver puts pressure on his knees and thighs to grip the seat and operate the vehicle. For such maneuvers, the straddle-type seat is required to have a hardness that allows the seat to be easily held. However, if the focus is only on how the seat is operated, the ride quality will be compromised and the seat will not be able to fulfill its original role. Therefore, it is known to form cushion materials of different hardness in the knee and thigh parts by bonding and laminating them with an adhesive or the like. Also, JP-A-55-96195 and JP-A-59-
Publication No. 138423 proposes a foam product with different hardness due to the difference in specific gravity of the foam material, and a technology for manufacturing the same. [Problems to be Solved by the Invention] The above-mentioned technology of bonding and laminating cushion materials with different hardnesses using an adhesive does not solve the problem of bonding due to an increase in the number of manufacturing steps, changes in stress during operation, etc. Peeling of the surface is likely to occur. Also, JP-A-55-96195 and JP-A-59-
The technique proposed in Japanese Patent No. 138423 is to form a material by sinking or floating another material into a given material depending on the difference in specific gravity. The present invention is based on Japanese Patent Application Laid-Open No. 55-96195 and
This technology provides cushion materials with different hardness using a technology different from that proposed in Publication No. 59-138423, and by using such cushion materials, both maneuverability and ride comfort in straddle-type seats can be improved. You can obtain a sheet that satisfies your requirements. [Means for Solving the Problems] In the present invention, parts with different hardness are formed on the seat. For example, a foam material with good cushioning properties is formed on the rider's buttocks, and a foam material with good cushioning properties is formed on the rider's buttocks. A harder cushion material is formed on the part). Further, in the cushion materials having different hardnesses, partitions are formed on the left and right sides slightly inside the left and right ends of the cavity, and a first material forming a soft foam is inserted between the left and right partitions, A second material that forms a foam that is harder than the first material is placed between the left and right partitions and the cavity side walls, and is formed by foam molding. [Function] As described above, in the present invention, since the portions that contact the knees and thighs are made harder than the seat surface, it is possible to provide a cushion material that satisfies both the requirements for maneuverability and riding comfort in a straddle-type seat. In manufacturing the above-mentioned cushion material, a technique is provided in which a partition is formed in the cavity, materials having different hardnesses are separated by the partition, and the materials are foam-molded. [Example] An example of the present invention will be described below based on the drawings. Figure 1A shows the cushion material for the straddle seat, Figure 1B is a cross-sectional view taken along the - line in Figure 1A, and Figure 1C is a cross-sectional view of the upper mold before foaming. , FIG. 1D is a sectional view of the mold at the time when foaming is completed. In this example, a cavity (lower mold) 4 and a core (upper mold) 5 as shown in FIG. , about 20mm from 4a
50 mm), preferably at a position of about 30 mm, respectively. The height of the partitions 6, 6 is approximately 20 mm. Then, the first material A forming a soft foam is put between the left and right partitions 6, and the left and right partitions 6, 6 and the side walls 4a, 4a of the cavity 4 are inserted.
a second material forming a harder foam than the first material between the
Add each of the ingredients B and perform foam molding. In the molding process, as shown in FIG. No materials are required. The cushion material 1 integrated by molding is
As shown in FIGS. 1A and 1B, the cushion part 2 corresponding to the buttocks and the cushion part 3 corresponding to the knees and thighs have different hardnesses with the groove 7 as a boundary. Since the grooves are formed in portions with different hardnesses in this way, the difference in hardness can be determined without relying on color classification or the like. For example, if the material of the foam used in the present invention is polyurethane, the hydroxyl value is 24 to 45.
50 to 100 parts by weight of polyether polyol,
Using 0 to 50 parts by weight of a polymer polyol with a hydroxyl value of 24 to 30 in a predetermined ratio, adding an amine crosslinking agent with a hydroxyl value of 500 to 1600, water and a desired amount of a tertiary amine catalyst, the NCO% is approximately 10. Add a significant amount of an aromatic isocyanate blend that is ~48%. In addition, silicone surfactants, freon-
11 etc. is used. An example using polyurethane foam is shown below. (Example) The cavity 4 is preheated to 50°C ± 5°C, and between the partitions 6 formed in the cavity 4, as shown in Table 1 below,
First material forming a soft foam (A below)
A second material (B below) that forms a foam harder than the first material is placed between the left and right partitions 6, 6 and the side walls 4a, 4a of the cavity. Then, they are foamed almost simultaneously. Curing was carried out at 80° C. for about 8 minutes after the mold was closed.

【table】 The cushion material obtained using the above materials is

[Table] It was. In this way, it is possible to obtain a cushion material that is an integral product having different hardness without using an adhesive. [Effects of the Invention] As described above, the present invention provides cushion materials with different hardnesses, and by using such cushion materials, the requirements for both maneuverability and ride comfort in a straddle-type seat can be satisfied. You can get a seat. Note that, as a matter of course, the present invention is not limited to the illustrated example.

[Brief explanation of drawings]

Fig. 1A shows the cushion material for the straddle type seat, Fig. 1B is a sectional view taken along the - line in Fig. 1A, Fig. 1C is a sectional view with the upper mold open before foaming, FIG. 1D is a cross-sectional view of the mold at the time when foaming is completed. 1...Cushion material, 2...Foam, 3...2
Harder foam, 4... Cavity, 5... Core, 6... Partition, 7... Groove.

Claims (1)

[Claims] 1. In cushioning materials for motorcycle and tricycle seats, the hardness of the parts that contact the knees and thighs is made harder than that of the seat surface, and the hardness between the seat surface and the parts that contact the knees and thighs is made harder. A cushion material for motorcycles and tricycles that is characterized by having a groove formed on the upper end. 2. Form left and right partitions slightly inside the left and right side walls in the cavity, insert a first material forming a soft foam between the left and right partitions, and insert a first material that forms a soft foam between the left and right partitions and the cavity side walls. A method for manufacturing a cushion material for motorcycles and tricycles, characterized in that a second material forming a foam harder than the first material is added and foam-molded.