Appeal No. 95-4878
Application No. 08/225,087
APPENDIX
1. A two-platen mold-clamping apparatus, comprising:
a stationary platen;
a movable platen disposed for reciprocal motion relative
to said stationary platen along a predetermined path to effect
mold opening and closing;
a plurality of ball nuts;
a respective bearing mechanism rotatably mounting each
said ball nut on said movable platen for rotation relative
thereto about an axis extending longitudinally of the path,
said bearing mechanisms each being operable to prevent
movement of the corresponding respective ball nut relative to
the movable platen in a radial direction and in an axial
direction relative to said axis;
a respective elongated ball screw continuosly threadably
engaged with each of said ball nuts, each ball screw having an
end portion fixed to said stationary platen, the opposite ends
of said screws extending through the movable platen and being
supported by said ball nuts and including threaded portions of
sufficient length to accommodate both mold-closing and mold-
clamping operations;
a motor mounted on said movable platen for movement
therewith and having an output shaft; and
operating structure operatively coupling said output shaft
of said motor to said ball nuts for rotating the ball nuts to
move said ball nuts and therefore the movable platen
longitudinally of the ball screws during both mold-closing and
mold-clamping opertions to thereby generate a mold-clamping
force.
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