JPH02183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a plastic handle that can be mass-produced at low cost, such as a grip member attached to the inner surface of a vehicle such as an automobile, a door handle, and the like.

(Prior art) Plastic handles, which do not easily rust, are often used as handles that are attached to the inner surface of a vehicle, but plastic handles have a structure in which the leg end of the handle body and the mounting seat protrude from this handle are used. The boundary part has insufficient strength and is more likely to be damaged than this part. Therefore, an insert molded product using a metal core material with both ends formed as mounting seats could be considered, but if the insert molding method was used using a normal injection molding machine, a complicated split mold would be required. This split mold is expensive because a large number of molds must be prepared depending on the shape and size of the handle, and when the split mold is used for insert molding with an injection molding machine, the mating marks of the split molds will appear, making it less aesthetically pleasing. There are problems such as damage to the

(Purpose of the Invention) The present invention was completed with the aim of providing a method for manufacturing a plastic handle that can easily mass-produce a handle that solves the above-mentioned problems and also ensures safety inside the vehicle. .

(Structure of the Invention) The present invention involves setting a strip-shaped metal plate piece in a cylindrical mold shorter than the metal plate piece, with both end portions of the metal plate projecting outside the mold, and then placing the metal plate piece in the mold. An elastic plastic material is supplied and a handle material with the metal plate piece as a core material is insert-molded, and after molding, the handle material is pulled out from one end of the mold and then bent into the desired handle shape to form the handle main body. At the same time, a mounting seat portion is bent at the tip of a portion extending from both ends of the main body portion thickly covered with molded elastic plastic of the metal plate piece. Hereinafter, the present invention will be explained in detail with reference to illustrated process diagrams.

In the present invention, first, as shown in FIG.
A metal plate piece 1 such as a steel plate of about 1.0 mm in diameter is cut using a press machine, etc., and a hole is punched to a width of 20 to 40 mm.
A large number of elongated metal plate pieces 3 having a length of 20 to 25 cm and having holes 2, 2 on both ends that are large enough to allow bolts to be inserted are manufactured. Next, this metal plate piece 3 is 10 to 15 cm shorter in length than the metal plate piece 3, and the inner surface is 30 cm in length.
The metal plate piece 3 was set in a flat cylindrical mold 4 of ~50 mm and 12 to 14 mm in height with both ends thereof extending outside the mold 4, and then a low-foaming polyurethane resin or the like was placed inside the mold 4. An elongated hole 5 into which an elastic plastic material such as vinyl chloride resin is supplied and into which the metal plate piece 3 can be inserted;
Both ends of the mold 4 are closed and clamped with lids 7 and 8 equipped with 6, and a handle material 9 as shown in FIG. At the same time, one end of the metal plate piece 3 is grasped and pulled strongly in the axial direction of the mold 4 to remove it from the mold. In addition, type 4
The metal mold is made seamless with a desired pattern such as a grain pattern formed on its inner surface by electroforming or the like, and a desired uneven pattern 10 is formed on the surface of the handle material 9. The reason why the handle material 9 with the uneven pattern 10 formed on its surface can be removed from the mold even though a cylindrical mold that is not a split mold is used as the mold 4 is due to the elasticity of the elastic plastic. . The handle material 9 demolded in this way has both end portions of the metal plate piece 3 overhanging both ends of the main body portion 11 made of elastic plastic molded into a cylindrical shape. In the process, the handle material 9 is bent into a desired handle shape using a bender, a press machine, etc., and the main body portion 11 is bent.
4 to form a handle main body 12 as shown in FIG.
1 are bent and formed into leg parts 14, 14 having mounting seats 13, 13 with holes 2, 2 at their tips. In addition, the leg part 1 of the handle main body 12
It is preferable to form recesses 15, 15 on the outer surface of the portion following the holes 2, 14 to facilitate the operation of inserting bolts into the holes 2, 2. For this purpose, the recesses 15 are formed on the inner surface of the mold 4. , 15 shall be provided. Further, it is preferable that the surface of the metal plate piece 3 is subjected to chemical treatment or mechanical treatment such as grooves so that the elastic plastic does not peel off during the bending process. It is made thicker than the metal plate piece 3 so that the handle body 12 can be covered securely and have sufficient cushioning properties.

The plastic handle thus obtained is fixed by bringing the mounting seats 13, 13 at the tips of the legs 14, 14 of the handle main body 12 into contact with the inner surface of the vehicle body, and using bolts inserted into the holes 2, 2. In this case, as mentioned above, since the handle main body 12 has the metal plate piece 3 as a core material and its surface is covered with thick elastic plastic, it is comfortable to grip and does not rust. The elastic plastic on the surface of the handle main body 12 is molded by the cylindrical mold 4 and has no mold joints, which gives it an extremely good appearance.The elastic plastic also exhibits an excellent cushioning effect, so it can be installed inside a car. Even if there is a collision, your body will not be injured by the handle, and in addition, the handle on the car body should be handled by the handle itself.
Since the mounting seats 13, 13 are provided at the tips of the metal plate pieces 3 inserted into the handle 2, sufficient strength of the handle portion is ensured and it can be used for a long period of time. Moreover, the plastic handle obtained by the method of the present invention is different from insert molding using a split mold in an injection molding machine, in that the metal plate piece 3 is used as the core material and the parts other than both ends are covered with elastic plastic. Since the handle material is manufactured by bending and processing, there is no need to prepare a large number of split molds with complicated structures depending on the shape and size of the handle, which saves mold costs and is inexpensive. There are advantages that can be provided.

(Effects of the Invention) As is clear from the above description, the present invention includes placing a strip-shaped metal plate piece into a shorter cylindrical mold, with both end portions of the metal plate projecting outside the mold. After insert molding, the handle material is pulled out from one end of the cylindrical mold and removed from the mold. This handle material is bent into the desired handle shape and the tip is Since the product is equipped with a handle seat, the mold cost is low, and it is a method of manufacturing plastic handles that can inexpensively provide products that are excellent in terms of decoration and safety, and it will greatly contribute to the development of the industry. It is something.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of the manufacturing process of a metal plate piece in the method of the present invention, FIG. 2 is a partially cutaway perspective view showing an example of the insert molding process in the method of the present invention, and FIG. 4 is a partially cutaway perspective view showing an example of the demolding step in the method of the present invention, and FIG. 4 is a perspective view of a product obtained by the method of the present invention. 2: hole, 3: metal plate piece, 4: cylindrical mold, 9: handle material, 11: main body part, 12: handle main body, 1
3: Mounting seat.

Claims (1)

[Claims] 1. A strip-shaped metal plate piece is set in a cylindrical mold shorter than the metal plate piece, with both ends of the metal plate protruding outside the mold, and an elastic plastic material is supplied into the mold. A handle material with the metal plate piece as a core material is insert-molded, and after molding, the handle material is pulled out from one end of the mold to be demolded, and the handle material is bent into a desired handle shape to form the handle main body, and the metal plate is A method for manufacturing a plastic handle, characterized in that a mounting seat is bent at the tip of a portion of the piece that overhangs both ends of a main body portion that is thickly covered with molded elastic plastic.