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US 5,837,182 AGranted
Method of molding synthetic resin screws
AssigneesToska Co., Ltd., Optec Co., Ltd.
InventorsToyohisa Hiroki, Tadashi Suzuki
Life of this patent
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Abstract
A process of molding a synthetic resin screw includes upper mold members 2 and 4, lower mold members 3 and 5, and four sets of slide cores 2a, 4a, 3a and 5a supported by the respective mold members and withdrawable in directions parallel to a parting plane between the upper mold members and the lower mold members.
Claims3
A method of molding a synthetic resin screw having a screw thread comprising:
- providing a mold assembly having one parting plane extending only along a crest of said screw thread for a length exceeding a single pitch of said screw thread and another parting plane extending only along a root of said screw thread for a length exceeding a single pitch of said screw thread;
- injecting synthetic resin into the mold assembly to mold the synthetic resin screw;
- and opening the mold assembly along the parting planes so as to remove the molded screw from the mold assembly.
Dependencies are inferred from the claim text.