JP2522850B2 - Leather-wrapped steering wheel manufacturing method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an improvement in a method for manufacturing a leather-wrapped steering wheel.

[Prior art]

The applicant has set a core metal in a tubular skin material and setting it in a mold, and the core metal injection molded with resin between the skin material, the resin coating material and the skin material are integrated. Japanese Patent Application Laid-Open No. 62-092816 discloses a method for manufacturing a leather-wrapped steering wheel.
Is proposed as. According to this method, the work can be carried out efficiently by injection molding, and the unevenness formed on the mold surface due to heat and pressure during molding (texturing) is easy, and no adhesive is used. There is an advantage that the skin can be fixed to the skin, the manufacturing process can be rationalized, and the cost can be reduced.

[Problems to be Solved by the Invention]

According to the above method, the resin may flow out from the seam of the leather material due to the pressure at the time of injection molding, and it is necessary to appropriately process the seam and select the pressure. The present invention has been made for the purpose of solving the above problems and allowing the features of the prior art to be more easily exhibited.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, according to the first manufacturing method of the present invention, a cavity having a shape corresponding to the outer surface shape of the portion of the steering wheel to be skin-wrapped is provided by disposing the core metal of two skin materials. The core metal and the coating material are set in a molding die provided, and the resin for molding is injected between the two skin materials in a state where the peripheral edge of each skin material is held by the above-mentioned mold to perform resin molding. Also, the leather material is integrated into a molded product, and unnecessary portions of the leather material generated in the parting line of the molded product are removed to obtain a leather-wrapped steering wheel. Further, in the second manufacturing method, a cored bar is arranged inside one folded back leather material, and the cored metal is set in a molding die having a cavity corresponding to the outer surface shape of the portion of the steering wheel to be wound with leather. Then, a molding product in which the core metal, the covering material and the skin material are integrated by injecting the coating resin into the inside of the skin material while sandwiching the peripheral edge of the skin material with the above-mentioned mold to perform resin molding. As described above, as in the above, an unnecessary portion of the leather material is removed to obtain a leather-wrapped steering wheel.

[Action]

According to each of the above inventions, the resin is molded with the peripheral edge of the leather material held by the molding die, and since there is no seam of the leather material in the cavity, the resin flows out of the leather material. There is nothing to do.

【Example】

Next, the illustrated embodiment will be described. 1 to 3 show an embodiment of the first invention. In the figure, 1a and 1b are leather materials, 2 core metals, 3 coating materials, 4
Is a leather-wrapped steering wheel, 5 is a mold,
6 is the cavity. The leather materials 1a and 1b are processed so as to have a contour that roughly corresponds to the shape of the portion of the steering wheel 4 that is to be leather-wrapped. As shown in FIGS. Place the core metal 2 between 1a and 1b, set it in the molding die 5, and set each leather material 1a, 1
Hold the peripheral portion 11 of b with the mold 5. The cavity 6 of the molding die 5 has a shape corresponding to the outer surface shape of the portion of the steering wheel 4 to be wrapped with leather. Then, in this state, a soft resin for the covering material is injection-molded between the two skin materials 1a and 1b, so that the core metal 2, the covering material 3 and the covering material 3 as shown in FIGS. Formed product 4'in which leather materials 1a and 1b are integrated, and unnecessary part 11 'of the skin material generated on the parting line part of the molded product 4'is removed by line aa, and the steering is wrapped around the leather. Get the wheel 4. The molding die 5 is, for example, divided into two parts on a plane parallel to the ring surface of the ring part 4b, and the gate is, for example, the tip part of the spoke part 4a as illustrated by an arrow C in FIG. It is provided at an inconspicuous position such as the edge of the leather wrapping part. As the soft resin for the covering material 3, for example, thermoplastic resins such as polypropylene, vinyl chloride, urethane, and polyolefin, and elastomers thereof are used. Next, an embodiment of the second invention shown in FIGS. 4 and 5 will be described. The same parts as those in the above-described embodiment are designated by the same reference numerals (the same applies in the following embodiments). The leather material used in the present invention is one, and 1 is a leather material. The skin material 1 is folded back around the core metal 2 as shown in FIGS. 4 and 5 (a), set in the molding die 5, and the peripheral edge portion 11 of the skin material 1 is held by the die 5. . Then, in this state, a resin for the covering material is injection-molded into the inside of the skin material 1 to form a molded product in which the core metal 2, the covering material 3 and the skin material 1 are integrated as shown in FIG. 5 (b). 4 ', and the unnecessary portion 11' of the leather material generated on the parting line portion of the molded product 4'is removed by the line bb to obtain the leather-wrapped steering wheel 4.

【The invention's effect】

As is apparent from the above-mentioned embodiments, each invention holds the peripheral edge of the skin material with a molding die, and in this state, inside the skin material, or between the skin material and the core half, Alternatively, a resin is injected between the leather material and the core metal or the mold to mold the resin. Therefore, it is possible to efficiently proceed the work by a resin molding process such as injection molding, it is easy to grain by heat and pressure at the time of molding, and the skin can be fixed without using an adhesive,
It has the same features of the prior art as it is, and since there is no seam of the skin material inside the cavity, there is no resin flowing out of the skin material, and it is possible to easily rationalize the manufacturing process and reduce the cost. The effect is obtained.

[Brief description of drawings]

1 to 3 show an embodiment of the first invention, FIGS. 1 (a) to (c) are explanatory views of a manufacturing process, FIG. 2 is a front view of a leather-wrapped steering wheel, FIG. Figure 3 (a),
(B) is the sectional view on the AA line and the BB line of FIG.
4 and 5 show an embodiment of the second invention, and FIG. 4 is an explanatory view of the folded state of the leather material, FIG. 5 (a),
(B) is a process explanatory diagram. 1,1a, 1b ... Leather material, 2 ... Core metal, 3 ... Coating material, 4 ...
… Skin-wrapped steering wheel, 4 ′ …… Molded product, 4a …… Spoke part, 4b …… Ring part, 5 …… Molding die, 5a …… Male mold, 5b …… Female mold, 6 …… Cavity , 7 ...
… Core half, 11 …… peripheral part, 11 ′ …… Unnecessary part.

Claims (2)

(57) [Claims] 1. A cavity having a shape corresponding to an outer surface shape of a portion of a steering wheel (4) to be skin-wrapped by disposing a core metal (2) between two skin materials (1a) and (1b). It is set in a molding die (5) equipped with (6), and the peripheral material (11) of each leather material (1a), (1b) is held by the metal mold (5), and the leather material (1a), A molding product (4 ') in which the core metal (2), the coating material (3), and the skin materials (1a) and (1b) are integrated by injecting a coating resin between (1b) and molding the resin. ) And removing unnecessary portions (11 ′) of the leather materials (1a) and (1b) generated on the parting line of the molded product (4 ′) to obtain a leather-wrapped steering wheel (4). And a method for manufacturing a leather-wrapped steering wheel. 2. A cavity (6) having a shape corresponding to the outer surface shape of a portion of a steering wheel (4) to be wrapped with leather, by arranging a core metal (2) inside one folded back leather material (1). ), And injecting a coating resin into the inside of the skin material (1) while being held by the mold (5) at the peripheral edge (11) of the skin material (1). Resin molding to form a molded product (4 ') in which the cored bar (2), the covering material (3) and the skin material (1) are integrated, and the parting line portion of this molded product (4') Leather material (1)
A method for manufacturing a leather-wrapped steering wheel, characterized in that the unnecessary portion (11 ') of (1) is removed to obtain a leather-wrapped steering wheel (4).