US 6,981,860 B2
Apparatus for manufacturing synthetic resin hollow member incorporating an intermediate element therein
Yoshihiro Takemoto, Higashihiroshima (Japan); and Shoso Nishida, Hiroshima (Japan)
Assigned to G.P. Daikyo Corporation, Hiroshima (Japan); and The Japan Steelworks, Ltd., Tokyo (Japan)
Filed on Aug. 10, 2001, as Appl. No. 9/925,789.
Application 09/925789 is a division of application No. 09/189150, filed on Nov. 10, 1998, granted, now 6,299,816.
Claims priority of application No. 9-313227 (JP), filed on Nov. 14, 1997.
Prior Publication US 2002/0027098 A1, Mar. 07, 2002
Int. Cl. B29C 45/14 (2006.01)
U.S. Cl. 425—116 1 Claim
OG exemplary drawing
 
1. An apparatus for manufacturing a synthetic resin hollow member incorporating an intermediate element wherein after the intermediate element is disposed between a pair of synthetic resin-made half bodies, the half bodies are brought into abutment with each other and joined together at their abutting portions, whereby the synthetic resin hollow member incorporating the intermediate element is produced, the apparatus comprising:
a pair of molding dies assembled together so as to be opened and closed relative to each other;
rotary mechanism for rotating at least one of the molding dies over an angle of (360/6n) degrees for each turn relative to the other molding die wherein n is a natural number; and
injection machine for injecting a melted resin mass into a molding cavity defined by the pair of molding dies being closed;
the molding dies each having a half body molding section consisting of at least one male molding portion and two female molding portions provided in a repetitive sequence of male/female/female in the direction of rotation for each rotational run over an angle of (360/3n) degrees, and an intermediate element molding portion provided between specified half body molding portions in the direction of rotational movement for each (360/3n) degrees; and wherein:
for every two rotational runs of the molding dies, a first injection is carried out such that first and second half bodies are molded by a combination of male and female molding portions, and an intermediate element to be set between the first and second half bodies is molded by a combination of intermediate element molding portions, and after the intermediate element is mated to and fitted in the first half body molded at the first injection step, the first half body in which the intermediate element is set is mated to and abutted with a corresponding second half body so that the half bodies are assembled into a molded product, and a second injection is carried out such that melted resin is injected onto the abutting portions of the two half bodies for joining the half bodies together, whereby for every two rotational runs of the molding dies, a hollow member with the intermediate element set between the first and second half bodies can be obtained.