Locking apparatus for a movable platen
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United States of America Patent
Stats
-
May 15, 2001
Grant Date -
N/A
app pub date -
Jun 4, 1999
filing date -
Jun 4, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A locking apparatus secures a movable platen in position relative to strain rods on which the movable platen is slidably carried. The locking apparatus includes split nuts that are carried by the movable platen and are pivotable about respective pivot axes between a first position in which the split nuts engage the strain rods and a second position in which the split nuts are pivoted away from the strain rods. The strain rods include grooved sections and the split nuts carry internal grooved portions that are complementary with the grooved portions of the strain rods so that the split nuts are engageable with the grooved portions of the strain rods to retain the movable platen in a desired position during a molding operation. Respective pairs of split nuts are actuated simultaneously by a piston and cylinder arrangement that causes movement of a primary pair of links to move the halves of one split nut and a pair of secondary links that extend from the one split nut to the other split nut so that the split nut halves are each operated by the same cylinder. The lengths of the primary and secondary links are adjustable to enable the first and second split nuts to be moved simultaneously through the same degree of arc.
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