Locking apparatus for upper and lower molds of a press
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United States of America Patent
Stats
-
Mar 9, 1999
Grant Date -
N/A
app pub date -
May 30, 1997
filing date -
Nov 21, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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