Method of and apparatus for molding synthetic resin screws
AssigneesToska Co., Ltd., Optec Co., Ltd.
InventorsToyohisa Hiroki, Tadashi Suzuki
Life of this patent
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Abstract
An apparatus for 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.
Claims12
A method of molding a synthetic resin screw, wherein the synthetic resin screw is molded by using a mold assembly having non-axially extending parting planes at a crest and at a root of a screw thread comprising the steps of;
- providing the mold assembly having the non-axially extending parting planes at the crest and at the root of the screw thread to form a cavity for a screw by means of an upper molding block, a lower molding block, and separate slide cores engaged in and with the respective upper and lower molding blocks;
- charging a molten resin into the cavity;
- moving the slide cores after the molten resin has been solidified;
- and moving the upper molding block and the lower molding block by utilizing spaces from which the respective slide cores have been moved away, and taking out a molded screw.
An apparatus for molding a synthetic resin screw, comprising:
- an upper molding block;
- a lower molding block;
- and separate slide cores respectively slidably supported in and by the upper molding block and the lower molding block and respectively withdrawable in directions parallel to a parting plane between said upper molding block and said lower molding block block;
- said upper molding block, and said lower molding block, together with said separate slide cores forming a cavity surface for molding said synthetic resin screw.
Dependencies are inferred from the claim text.