Abstract: A bearing apparatus includes a coil spring having a center portion in which a wire is wound at a predetermined pitch, and end turn portions arranged at both end portions of the center portion. Each of the end turn portions is formed by winding the wire at least three turns with a pitch which is smaller than the predetermined pitch of the center portion. A bearing member has a main body with an opening for supporting a shaft, and a connecting portion for connecting the coil spring to the main body. The main body and the connecting portion are integrally formed from a resin material by molding, and the end turn portion of the coil spring is connected to the connecting portion through molding of the main body and the connecting portion. The connecting portion of the bearing member has an inner connecting portion which protrudes into an inside of the end turn portion of the coil spring, and an outer connecting portion which surrounds an outside area of the end turn portion of the coil spring.

Abstract: The object of the invention is to disuse press fitting of a coil spring into a bearing made of a resin material, to prevent resin chips that may be produced during press fitting. In order to achieve this object, the coil spring is inserted in the cavity of a mold. The coil spring is partly exposed in the cavity. A molten resin material is injected into the cavity and solidified. The resin material and a portion of the coil spring which is exposed in the cavity are connected to and integrated with each other.

Abstract: The object of the invention is, in integrating two or more types of resin materials having different compositions or tones in a mold, thus molding a multi-color, multi-material molded article, to increase the strength of the bonding surfaces of the resins. To achieve this object, this invention provides an injection molding method of injecting two or more types of resin materials having different compositions or tones into a mold, thus producing a molded article in which the two or more types of resin materials are bonded. Convexo-concave shapes are formed on the bonding portions of the two or more types of resin materials.

Abstract: This invention has as its object to provide a composite molded product in which the second and subsequent members can be easily separated from the first member. In order to achieve this object, in the composite molded product made of a plurality of types of resin materials, materials that are not miscible with each other are used as the plurality of types of resin materials. Portions (1, 3) made of different resin materials can be separated from each other.

Abstract: A polyamide resin containing reinforcing fiber is dry blended with a polyamide resin containing no or less reinforcing fiber. A polyamide resin containing 15 to 50% by weight of reinforcing fiber thus obtained is used as a material. By using a moving type core having a two-stage structure including a large diameter moving core and a small diameter moving core, a tubular hollow molded body 17 is formed, and redundant portions 18 and 19 are cut and removed.