Insert-molded article, insert mold and insert molding method
AssigneeCanon Kabushiki Kaisha
InventorsYoshiaki Sasatani, Hiroshi Toda, Katsushige Uematsu
Life of this patent
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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.
Claims18
An insert-molded article wherein a coil spring is inserted in a cavity of a mold, the coil spring is partly exposed in the cavity, a molten resin material is injected into the cavity and solidified, and the resin material and a portion of the coil spring which is exposed in the cavity are connected to and integrated with each other.
An insert mold comprising:
- a cavity where molten resin is to be injected to produce a molded article;
- and
- a holding portion to hold a coil spring such that the coil spring is partly exposed in said cavity.
An insert molding method of insert-molding a coil spring member, comprising
- forming a cavity for molding a bearing member in stationary and movable pieces, forming a holding portion molding cavity portion for molding a holding portion which holds an end of the coil spring member in the cavity, inserting the coil spring member into the holding portion molding cavity portion, and closing the pieces to inject a resin material, thereby insert-molding the coil spring member into the bearing member.
An insert molding method of insert-molding a coil spring member into a bearing member, comprising
- forming a bearing member molding cavity for molding the bearing member in stationary and movable pieces for molding the bearing member, forming an inserting portion for inserting the coil spring member to oppose the bearing member molding cavity, inserting the coil spring member into the inserting portion, and injecting a resin material while the coil spring member is kept compressed into the bearing molding cavity.
An insert molding method of insert-molding a coil spring member into a bearing member, comprising steps of
- temporarily stopping a clamping operation while stationary and movable pieces are kept at a predetermined distance,
- positioning the coil spring member at a predetermined position,
- resuming the clamping operation and closing the stationary and movable pieces to form a cavity, and
- injecting a resin material into the cavity.
An insert-molded article wherein a cavity for molding a bearing member in a mold for molding the bearing member is provided, an end of a coil spring member is inserted in the cavity, the end of the coil spring member is insert-molded into the bearing member by injecting a resin material into the cavity, and the other end of the coil spring member is a free terminal.
An insert-molded article in which a metal coil spring is insert-molded, wherein
- a holding portion molding cavity for molding a holding portion which holds the coil spring close to an article molding cavity for forming the molded article, the metal coil spring is arranged close to the article molding cavity, the mold is closed, and the coil spring is insert-molded into the molded article by injecting a resin into the article molding cavity and the holding portion molding cavity.
Dependencies are inferred from the claim text.