Plastic article or earthenware shaping or treating: apparatus – Segmented female mold and mold clamping means
Patent
1991-08-15
1992-11-03
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Segmented female mold and mold clamping means
100219, 425595, 425DIG221, B30B 1500
Patent
active
051607506
ABSTRACT:
A clamp assembly for selectively friction clamping a member with respect to a column includes inner and outer threaded portions positioned concentrically around the column and within a housing attached to the member. The inner and outer threaded portions are threaded together to transfer force therebetween. A sealed chamber between the inner and outer threaded portions is selectively pressurized to cause an inner surface on the inner threaded portion to displace inwardly onto an outer surface of the column and the outer threaded portion displacing outwardly to provide frictional resistance to longitudinal movement of the member with respect to the column. The inner thread portion and the outer thread portion have a thread pitch difference to substantially compensate for strain deformation occurring thereupon.
REFERENCES:
patent: 4509910 (1985-04-01), Petersen
patent: 4846614 (1989-07-01), Steinbock
patent: 4907959 (1990-03-01), Hauch
Mackey James P.
MTS Systems Corporation
Woo Jay H.
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