US PATENT SUBCLASS 405 / 199
.~.~ Frictional gripper

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

195.1  DF  MARINE STRUCTURE OR FABRICATION THEREOF {11}
196  DF  .~ With work deck vertically adjustable relative to floor {4}
199.~.~ Frictional gripper

DEFINITION

Classification: 405/199

Frictional grippers:

(under subclass 196) Method or apparatus wherein the platform is provided with means which clamp against the generally smooth exterior of a columnar support, which means effects vertical movement of the platform relative to its support.