US PATENT SUBCLASS 405 / 245
.~.~.~ Driving removable wall supporting 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.~.~.~ Driving removable wall supporting core {1}
246  DF  .~.~.~.~> Diametrically retractable core {1}

DEFINITION

Classification: 405/245

Driving removable wall supporting core:

(under subclass 232) Method or apparatus in which the elongated member comprises a hollow shell which is driven into the earth by means which is adapted to extend within the interior of said hollow shell to prevent the buckling in or collapsing of the walls thereof.

SEE OR SEARCH CLASS

173, Tool Driving or Impacting,

128, for an anvil to transmit impact from a hammer head to a tool or the like.