Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Varying pressure and/or speed closing
Patent
1997-05-30
1999-03-09
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Mold opening and closing means and segmented female mold
Varying pressure and/or speed closing
4254517, 4254519, 425590, 425595, B29C 4566
Patent
active
058797262
ABSTRACT:
A locking apparatus for an upper mold and a lower mold of a press apparatus includes a ball screw, a screw nut, a force producing spanner structure and at least one engagement structure. The screw nut is responsive to a first power source for driving the ball screw in an axial direction to perform a lower-pressure higher-speed stroke. The spanner is responsive to a second power source for producing a force in circumferential direction. The engagement structure is arranged around an external rim of the screw nut. Responsive to the force in the circumferential direction, the engagement structure closely engages with the external rim of the screw nut such that a corresponding friction force is applied to the screw nut. The screw nut, responsive to the friction force, drives the ball screw in the axial direction to perform a higher-pressure stroke to lock the upper mold and lower mold.
REFERENCES:
patent: 4797086 (1989-01-01), Adachi
patent: 4929165 (1990-05-01), Inaba et al.
patent: 4968239 (1990-11-01), Inaba et al.
patent: 5190714 (1993-03-01), Reinhart
patent: 5698240 (1997-12-01), Haguchi
Gallant Precision Machining Co., L.T.D.
Mackey James P.
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