JPH0358943B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing an all-leather wrapped steering wheel in which the entire ring portion of an automobile or the like is wrapped with leather such as real leather or synthetic leather.

<Prior Art> It is known that the ring portion of an automobile handle is wrapped with leather to prevent the hand from slipping during operation. Conventionally, this type of leather-wrapped handle is made by gluing a strip of leather to the ring part of the handle, which has been molded in resin in advance, and then sewing the edges of the leather by hand to form a cylindrical body. Common.

<Problems to be solved by the invention> In the case of the above structure, there are problems in that many parts rely on manual labor, which makes it difficult to mass produce and increases manufacturing costs. With leather-wrapped handles, the above-mentioned problems were noticeable.

The present invention has focused on these points, and has been made with the object of providing a method of manufacturing a fully leather-wrapped handle, which makes it easy to wrap the entire ring with leather and is inexpensive to manufacture.

<Means for Solving the Problems> In order to achieve the above object, the present invention covers the outer circumferential surface of the ring portion of a roughly ring-shaped core metal with a band-shaped skin body, and further joins both side edges of this skin body. to form a ring-shaped leather cylinder that covers the entire ring part of the core metal, insert the core metal covered with this ring-shaped leather cylinder into a molding die, and insert one part of the ring-shaped leather cylinder. By injecting foaming resin between the core metal and the ring-shaped leather cylinder through the injection port provided in the part and reaction-molding it,
The outer peripheral surface of the ring portion of the core bar is covered with a foamable resin, and the outer peripheral surface of the foamable resin is covered with a ring-shaped leather cylinder.

<Function> Since foamable resin is injected into the inside of the ring-shaped leather cylinder that covers the entire ring portion of the core metal, there is a process of covering the outer circumferential surface of the core metal with the foamable resin, and The process of covering the surface with a leather cylinder is performed at the same time, and a fully leather-wrapped handle can be obtained without manual work such as sewing.

<Example> An example of the present invention will be described below based on the drawings.

FIG. 2 shows a fully leather-wrapped handle manufactured according to this example. The handle body 1 consists of a ring part 1a, a spoke part 1b, and a shaft continuous part 1c. The ring portion 1a is covered with a foamable resin 3, and furthermore, the ring portion 1a is covered with a ring-shaped leather cylinder 4 over the entire circumference.

As shown in FIG. 1, the core metal 2 has a ring portion 2a,
Consisting of spoke portions 2b and shaft continuous portions 2c,
The leather cylinder 4 is made of a belt-shaped leather main body 5 obtained by cutting a leather sheet such as real leather or synthetic leather into a shape as shown in FIG. The entire skin 5 has spokes 5a
In the case of a in Fig. 3, the two skin bodies 5 are glued together at their edges 5b to form a shape similar to that shown in b in Fig. 3, and then the edges 5c are glued together. and form it into a ring shape. Next, this ring-shaped skin main body 5 is placed over the ring portion 2a of the core bar 2 from the outside, and the side edges 5d are glued together on the inside to form a ring portion 2a.
A ring-shaped leather cylinder 4 covers the entire body. As shown in FIG. 4, the edge 5e of the spoke portion 5a is
It is wound around a reinforcing frame 6 having an outer diameter corresponding to the finished outer diameter of the spoke portion 1b, and is fixed to the reinforcing frame 6 by adhesive or other means to maintain a predetermined shape.

FIG. 1 shows the state in which the core metal 2 covered with the leather cylinder 4 obtained above is inserted into a molding die 7, and the molding die 7 is either an upper mold or a lower mold. Only one side is shown. The molding die 7 has a second
A cavity 8 corresponding to the finished shape of the handle body 1 as shown in the figure is provided, and the core bar 2 is inserted into the cavity 8 using the shaft connecting portion 2c or an insert pin (not shown). are set correctly without any bias. The edge 5e of the spoke portion 5a, which is kept in a predetermined shape by the reinforcing frame 6, is fitted into the cavity 8 without any gaps to form an injection port 9. A gate 10 is provided, and a sprue 11 and a runner 12 are formed in communication with the gate 10. In this embodiment, the injection port 9 and the gate 10 are provided at symmetrical positions,
Correspondingly, air vent holes 13 are provided in the molding die 7 at both upper and lower ends in the figure, and air vent holes 14 are provided in the leather cylinder 4 so as to be located on the center line. The air vent holes 13 and 14 can also serve as overflow holes. 4 is an enlarged view of the vicinity of the injection port 9, and FIG. 5 is an enlarged view of the vicinity of the air vent hole 14. 5d' in FIG. It shows the part. Note that the gate 10 and the air bleed holes 13 and 14 are arranged on the back side of the handle body 1 so that gate marks and air bleed marks are not formed on the front side of the handle body 1.

After the setting in the molding die 7 is completed in this way,
The foamable resin 3 is injected through the gate 10. As a result, the foamable resin 3 is injected from the injection port 9 between the core metal 2 and the leather cylinder 4, and is filled inside the leather cylinder 4 while expelling air from the air vent holes 13 and 14, or The surrounding areas of the spoke portions 2b and shaft connecting portions 2c where there is no leather cylinder 4 are also filled, and foaming reaction molding is performed. Through the above steps, a fully leather-wrapped handle as shown in FIG. 2 is manufactured, and the foamed resin 3
A handle body 1 having a leather cylinder body 4 integrated with the handle body 1 is obtained.

As the above-mentioned foamable resin, ordinary foamable polyurethane resin etc. can be used, but in this embodiment, since the ring portion is covered with the leather cylinder 4, light resistance and abrasion resistance are not so required. . Therefore, it is also possible to use low-cost or low-hardness resin materials, such as foamed polyurethane resin or foamed polyethylene, for which light resistance and abrasion resistance are not taken into consideration. It is also possible to abolish coats. In addition, the part covered by the leather cylinder 4 does not generate burrs even at the parting line of the mold, and does not cause defects such as bubbles or blisters.
Since it occurs only on the inside of the seam and is formed into a predetermined shape, there are no irregularities such as seams, and the appearance is smooth.

Note that during molding, a considerable tensile force is applied to the leather cylinder 4, and it is molded with several tens of percent elongation, so the material is elastic and can withstand the above elongation. From this point of view, it is desirable to use real leather or synthetic leather using fine fibers as the leather tube 4 (leather body 5).

<Effects of the Invention> As is clear from the description of the above-mentioned embodiments, the present invention involves injecting a foamable resin into the inside of a ring-shaped leather cylinder that covers the entire ring portion of the core metal and performing reaction molding. Therefore, the step of covering the outer peripheral surface of the core metal with the foamable resin and the step of covering the outer peripheral surface of the foamable resin with the leather cylinder can be performed simultaneously. Therefore, compared to manual leather wrapping, the work time is shortened, manufacturing costs can be reduced through mass production, the quality is uniform, and it is easy to produce all-leather wrapped handles with excellent appearance. This makes it possible to obtain

[Brief explanation of drawings]

Fig. 1 is a diagram showing a state in which a molded object is set in a molding die in an embodiment of the present invention, and Fig. 2 is a partially cut away and enlarged view of a fully leather-wrapped handle manufactured in accordance with the same embodiment. 3 is a plan view of the skin body, and FIGS. 4 and 5 are enlarged views of the main parts of FIG. 1, respectively. DESCRIPTION OF SYMBOLS 1... Handle body, 2... Core metal, 2a... Ring part, 3... Foaming resin, 4... Ring-shaped leather cylinder, 5... Leather body, 5d... Side edge, 7... Molding mold, 9... injection port.

Claims (1)

[Claims] 1. Cover the outer peripheral surface of the ring part of the roughly ring-shaped core metal with a band-shaped skin body, and further join both side edges of this skin body to form a ring-shaped leather cylinder that covers the entire ring part of the core metal. The core metal covered with the ring-shaped leather cylinder is inserted into a mold, and foaming is carried out between the core metal and the ring-shaped leather cylinder through an injection port provided in a part of the ring-shaped leather cylinder. By injecting a synthetic resin and performing reaction molding, the outer peripheral surface of the ring portion of the core metal is covered with a foaming resin, and the outer peripheral surface of the foaming resin is integrally covered with a ring-shaped leather cylinder. A method for manufacturing a fully leather-wrapped handle.