US PATENT SUBCLASS 405 / 246
.~.~.~.~ Diametrically retractable core

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

229  DF  FOUNDATION {2}
231  DF  .~ Columnar structure (e.g., pier, pile) {7}
232  DF  .~.~ Process or apparatus for installing {5}
245  DF  .~.~.~ Driving removable wall supporting core {1}
246.~.~.~.~ Diametrically retractable core {1}
247  DF  .~.~.~.~.~> Fluid pressure actuated

DEFINITION

Classification: 405/246

Diametrically retractable core:

(under subclass 245) Method or apparatus in which the core is adapted to be readily reduced in diameter to facilitate removal or insertion of the core from or into the hollow shell.