JPH0528163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for seamlessly applying a skin material such as genuine leather or synthetic leather to the entire circumference of a wheel ring of a steering wheel of an automobile or to a part of the wheel ring. This invention relates to a method for manufacturing a leather-wrapped handle.

BACKGROUND ART Hitherto, this type of leather-wrapped handle has been known to have various structures. For example, a piece of rectangular leather is rolled into a cylindrical shape to form an elongated cylindrical body 22, and as shown in FIGS. cover the surroundings,
The outer surfaces of the end edges 22a, 22a of the leather cylindrical body 22 are adhered to each other with an adhesive to cover the core metal 24 with the leather cylindrical body 22, and the adhesive portion 22b of the leather cylindrical body 22 is attached to the handle 25. The synthetic resin 23 is injected into the cylindrical body 22, and the cylindrical body 22 is stretched into a predetermined shape. Some handles 25 are manufactured by insert molding and the outside of the synthetic resin 23 is covered with leather.

Problems to be Solved by the Invention However, in the above method for manufacturing a handle,
When the core bar 24 covered with the leather cylindrical body 22 is placed in the pair of molds 20 and 21 and insert molding is performed with synthetic resin, the recesses 2 of the molds 20 and 21
The cylindrical body 22 can freely rotate around the axis of the cylindrical body 22 with respect to 0a, 21a, and the adhesive portion 22b of the cylindrical body 22 is attached to the recesses 20a, 21a.
However, it may move from the inside of the handle 25 to the outside. In this way, if the adhesive part of the cylindrical body is located on the outside of the handle, the design will be bad.
a and 22a are double and triple folded, and their elongation rate is smaller than that of the parts other than the edge of the cylindrical body, so there is a difference in the elongation rate near the edge located on the outside of the handle. There is a problem with wrinkles forming easily.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a leather-wrapped handle in which the contact portions of both end edges of the leather cylindrical body can be reliably positioned inside the handle. It's about doing.

Means for Solving the Problems In order to achieve the above object, the present invention positions the contact portions of both end edges of the leather cylindrical body with a positioning member so as to be located inside the handle with respect to the mold. The handle is configured such that the handle can be molded with resin while the handle is held in this position. That is, a predetermined portion of the core metal of the wheel ring is covered with a leather cylinder, the outer surfaces of both end edges along the axis direction of the cylinder are held in contact with each other, and the cylinder is folded into the cylinder, and then a pair of molding molds is inserted. The core metal of the wheel ring having the cylindrical body therein is placed, and then the middle piece for position holding in the pair of molds is brought into contact with the folded portion of the cylindrical body, and the core bar of the wheel ring is folded into both molds. The parts were held in a predetermined position, and then the two molds were clamped together and a synthetic resin was injected into the cylindrical body to perform insert molding.

Effect of the Invention In the above configuration, a predetermined portion of the core metal of the wheel ring, for example, the entire circumference of the wheel ring or a part thereof, is covered with a leather cylindrical body, and the outer surface of both end edges of the cylindrical body in the axial direction is covered with a leather cylindrical body. The core metal of the wheel ring having the cylindrical body is placed in a pair of molding molds, and then the core bar of the wheel ring having the cylindrical body is placed in a pair of molding molds, and then the core bar of the wheel ring is placed in a pair of molding molds for holding the position in the pair of molding molds. A middle piece is brought into contact with the folded part of the cylindrical body to hold the folded part in a predetermined position with respect to both molds, and then both molds are clamped and a synthetic resin is injected into the cylindrical body. Insert molding is performed to manufacture a handle by wrapping leather around the predetermined portions of the wheel ring.

Examples Examples according to the present invention will be described in detail below with reference to FIGS. 1 to 9.

The method for manufacturing the leather-wrapped steering wheel according to this embodiment is generally to wrap one sheet of leather into a wheel ring.
The core metal 2 made of a metallic cylinder is covered with the core metal 2 so as to form a gap between which the synthetic resin 3 is injected, and each end edge 1a is glued together and folded into the cylinder to make leather. A cylindrical body 1 is formed, and the core metal 2 covered with the cylindrical body 1 is placed in a pair of molds 5 and 6, and both end edges 1a of the cylindrical body 1,
The above-mentioned pair of molds 5 and 6 are overlapped, with positioning members 4, ..., 4 placed in the molds 5 and 6 regulating the adhesive part to which 1a is adhered to be located inside the handle. At the same time, a synthetic resin 3 such as polyurethane resin or nylon resin is injected into the cylindrical body 1 and insert molding is performed, so that the adhesive part is the inside of the handle, that is, the wheel ring 11.
The purpose of this project is to manufacture a leather-wrapped handle located on the inner circumferential surface side to which spokes are fixed.

The sheet-like leather is made of genuine leather or synthetic leather, and is cut into pieces slightly smaller than the inner circumferential dimension of the wheel ring 11 to cover the entire outer surface of the core bar 22 of the wheel ring 11, as shown in FIG. Then, the outer surfaces of both end edges 1a, 1a along the longitudinal direction are bonded to each other with an adhesive to form a cylindrical body 1 in which the bonded portions are folded into the cylindrical body 1. The portion 1b of the cylindrical body 1 which is glued with adhesive and folded into the cylinder is positioned at a predetermined position within both molds 5 and 6 by a positioning member 4, respectively.

The cylindrical body 1 is placed in a pair of molds 5 and 6 to form a handle. This pair of molds 5 and 6
are the respective mating surfaces 5f, 6 as shown in FIG.
f, semicircular first recesses 5a, 6a into which the cylindrical body 1 is fitted, and circular second recesses 5e, 6e into which the boss and boss plate portion 8 of the handle are fitted;
Third recesses 5d and 6d into which each spoke 7 is fitted by communicating the first recesses 5a and 6a and the second recesses 5e and 6e, and the first recesses 5a and 6a and the second recess 5
The fourth recesses 5b and 6b are respectively located in the portions surrounded by the third recesses 5d and 6d and each of the fan-shaped positioning members 4 is fitted therein. In addition, in the figure,
5c and 6c are gate parts.

Positioning member 4 fitted into each of the molds 5 and 6
As shown in Fig. 3, is a middle piece made of a metal fan-shaped plate. The positioning member 4 has a tip portion 4b projecting outward in the radial direction on its outer circumferential arc portion, and curved surfaces 4a that contact the outer surface of the folded portion 1b of the cylindrical body 1 on the upper and lower surfaces of the tip portion 4b,
4a, respectively, and fit into the fourth recesses 5b, 6b of the molds 5, 6, respectively, as shown in FIGS. The folded portion 1
b is positioned and held relative to both molds 5 and 6.

A handle is manufactured using the pair of molds 5 and 6 as described below. That is, the leather is cut into a predetermined shape as described above to cover the outer surface of the core bar 2 of the wheel ring 11, and the outer surfaces of the edge portions 1a, 1a are bonded to each other with adhesive to form both edge portions 1a, 1a. 1a is folded into a cylinder to form a cylindrical body 1. This cylindrical body 1 is placed in the first recesses 5a, 6a of the lower mold 6 of the pair of molds 5, 6, and the boss and boss plate portion 8 are placed in the first recesses 5a, 6a of the lower mold 6. The spokes 7 are inserted into the second recesses 5e and 6e, and the spokes 7 are inserted into the third recess 5.
d, 6d, the cylindrical body 1 is placed in the fourth recesses 5b, 6b.
At the same time, the four fan-shaped positioning members 4, ..., 4 are fitted into the fourth recesses 5b, 6b, respectively, so that the tip end 4a of each positioning member 4 is aligned with both molds 5, 6. The tip portion 4a is located along the surfaces 5f and 6f and enters into the recess of the folded portion 1b of the cylindrical body 1, and each vertically curved surface 4a is located along the cylindrical body 1.
The folded part 1b of the cylindrical body 1 is placed in contact with the upper and lower outer surfaces of the folded part 1b of the cylindrical body 1 against both molds 5 and 6.
are positioned and held on the mating surfaces 5f, 6f of both molds 5, 6. Then, the boss and boss plate portion 8 are placed in the second recess 5e of the other mold 5, the spokes 7 are placed in the third recess 5d, and the cylindrical body 1 is placed in the first recess 5a.
The positioning members 4 are respectively fitted into the fourth recesses 5b, and the pair of upper and lower molds 5 and 6 are clamped. After mold clamping, a liquid foamable polyurethane resin into which freon or water as a low boiling point liquid has been mixed in advance is passed through the gate formed by clamping the gate part 5c of the upper mold 5 and the gate part 6c of the lower mold 6. 3 is press-fitted into the gap between the cylindrical body 1 and the core metal 2 in the cylindrical body 1 in both the molds 5 and 6, and the chlorofluorocarbon is released in the molds 5 and 6 by the reaction heat of the polyurethane resin 3. Due to volume increase during vaporization, that is, foaming pressure, each leather cylinder 1
The resin 3 and the leather cylindrical body 1 are integrally pressed together in a state in which the outer circumferential surface of each cylindrical body 1 is aligned with the inner circumferential surface of the first recess of each mold 5, 6 by pressing outward in the radial direction. A handle with a glued wheel ring 11 is produced by reaction injection molding. This manufactured handle is manufactured by opening a pair of molds 5 and 6 to obtain each positioning member 4.
can be taken out from the molds 5, 6 after being taken out from the molds 5, 6.

In addition, when the wheel ring 11 is partially wrapped with leather, tighten the leather at both axial ends of the cylindrical body 1 with pins at a constant tension, and then position it with respect to the molds 5 and 6 to ensure that the wheel ring 11 is wrapped with leather. The leather is wrapped around a predetermined portion of the wheel ring 11.

According to the above embodiment, even if the synthetic resin 3 is injected into the cylindrical body 1, the folded portion 1b of the cylindrical body 1 is aligned with the mating surfaces 5f, 6f of the pair of molds 5, 6 by each positioning member 4. Since the cylindrical body 1 does not rotate within the first recesses 5a and 6a, the folded portion 1b of the cylindrical body 1 is located inside the handle and approximately at the mating surface 5 of both molds 5 and 6.
Wheel ring 11 securely positioned above f, 6f
The folded part 1b is not located on the outside of the handle and the design of the handle is not deteriorated, and the folded part 1b is located on the outside of the handle and does not prevent the leather from stretching. It does not cause wrinkles.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other embodiments. For example, the end edges 1a of the cylindrical body 1 are simply placed in the molds 5, 6 with the vicinity of both end edges 1a, 1a pressed against each other, without being bonded.
By making it possible to omit the gluing work in a, synthetic resin 3
Finally, both end edges 1a, 1a may be fixed. That is, as shown in FIGS. 6 to 9, both end edges 9a, 9 of sheet-like leather 9 having a predetermined shape
The other part 9b is formed by folding a in the case of genuine leather or by heating it in the case of synthetic leather.
The folded end edges 9 are made thicker.
a, 9a in the axial direction from the end of the thin metal tube 10 having notches 10a spaced approximately twice the thickness of the leather, so that both end edges 9a, 9a extend from the notches 10a in the radial direction of the metal tube 10. The cylindrical body 1 may be formed by being locked so that it cannot be pulled out, and by pressing the vicinity of both end edges 9a and 9a against each other. The above metal tube 10
It is preferable that the metal tube 10 has a large number of holes 10b, . Note that the notch 1 of the metal tube 10
The pressing force in the vicinity of both end edges 9a, 9a of the leather 9 due to the end surface of 0a is due to the pressing force of the synthetic resin 3
A force that does not leak outward from the vicinity is sufficient. In this way, the reason why adhesive strength to the extent of adhering the two end edges 9a, 9a is not required is because the back surface of the leather 9 of the cylindrical body 1 is usually a rough surface and the polyurethane resin has excellent adhesive properties. Therefore, when the polyurethane resin and the leather cylindrical body 1 are reliably adhered, the above-mentioned both end edges 9a, 9a can also be reliably adhered.

Moreover, if this metal tube 10 is fixed to the core metal 2,
When partially wrapping the wheel ring 11 with leather, the leather 9 can be reliably wrapped at a predetermined location on the wheel ring 11.

Further, the shape of the positioning member 4 is not limited to that described above, and for example, the shape of the curved surface 4a
are only provided on either the top or bottom,
The curved surface 4a may be formed to be convex instead of outwardly concave.

Further, the above-mentioned leather is used as an example of the skin material of the wheel ring 11, and the present invention can also be applied to other materials that can cover the core bar 2 of the wheel ring 11, like the above-mentioned leather.

Effects of the Invention According to the above configuration, even when the synthetic resin is injected into the cylinder, the folded part of the cylinder is held at a predetermined position with respect to the pair of molds by the positioning member, so that the cylinders of both molds are It is possible to manufacture a wheel ring in which the cylindrical body does not rotate around its axis within the body fitting recess, and the folded part of the cylindrical body is reliably positioned at a predetermined position inside the handle. The design of the handle will not deteriorate if the folded part is located outside the handle, and the folded part will not be located outside the handle and prevent the leather from stretching and causing wrinkles.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part showing a state in which a handle is manufactured in a pair of molds by a method for manufacturing a leather-wrapped handle according to an embodiment of the present invention, and FIG. 2 is a perspective view of the pair of molds. Figure 3 is a perspective view of the positioning member, Figure 4 is a plan view of the wheel ring core etc. fitted to the lower mold, and Figure 5 is the wheel ring core etc. fitted to the pair of molds. 6 is a perspective view of the leather, FIG. 7 is a perspective view of the leather with both end edges folded over, and FIG. An explanatory diagram showing a state in which a cylindrical body is formed by inserting the
10 and 11 are respectively a longitudinal cross-sectional view of a wheel ring formed from the cylindrical body shown in the figure, and a perspective view of a pair of conventional molds, and a conventional method for manufacturing a leather-wrapped handle. FIG. 3 is a longitudinal cross-sectional view of main parts showing a state of manufacturing in a mold. DESCRIPTION OF SYMBOLS 1... Cylindrical body, 1a, 9a... Edge part, 1b... Folding part, 2... Core metal, 3... Synthetic resin, 4... Positioning member, 5... Upper mold, 5a, 6a... First recessed part, 5
b, 6b...4th recessed part, 5c, 6c...gate part, 5
d, 6d...Third recess, 5e, 6e...Second recess, 5
f, 6f...Matching surface, 6...Lower mold, 7...Spoke, 8...Boss and boss plate portion, 9...Sheet leather, 10...Metal tube, 11...Wheel ring.

Claims (1)

[Claims] 1. A predetermined portion of the core bar 2 of the wheel ring 11 is covered with a leather cylindrical body 1, and the outer surfaces of both end edges 1a, 1a along the axial direction of the cylindrical body 1 are held in contact with each other. Then, the core bar 2 of the wheel ring 11 having the cylindrical body 1 is placed inside the pair of molding molds 5 and 6, and then the core bar 2 of the wheel ring 11 having the cylindrical body 1 is placed inside the pair of molding molds 5 and 6, and then the core bar 2 of the wheel ring 11 is placed inside the pair of molding molds 5 and 6 for holding its position. The middle piece 4 is brought into contact with the folded part 1b of the cylindrical body 1, and the folded part 1b is pressed against both molds 5 and 6.
is held in a predetermined position, and then both of the molds 5 and 6 are clamped, and a synthetic resin 3 is injected into the cylindrical body 1 to perform insert molding. Method.