US PATENT SUBCLASS 175 / 232
WITH MEANS MOVABLE RELATIVE TO TOOL BELOW GROUND TO STOP FLOW TOWARD BORE BOTTOM

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

232WITH MEANS MOVABLE RELATIVE TO TOOL BELOW GROUND TO STOP FLOW TOWARD BORE BOTTOM {8}
233  DF  .~> Movable to seal sample receiver at bore bottom pressure
234  DF  .~> With longitudinally spaced valve seats {1}
236  DF  .~> In sample receiver removable through below-ground tool shaft
237  DF  .~> Means comprises dropped element
238  DF  .~> Flow-stopping means includes relatively movable cutter element
239  DF  .~> With undisturbed core receiver {1}
241  DF  .~> Stops flow by movement about fixed pivot {1}
243  DF  .~> Resiliently biased or composed of flexible material

DEFINITION

Classification: 175/232

(under the class definition) Apparatus including a means which is movable below ground relative to a tool or to a part of a tool, whereby the movable means will substantially block the flow of material toward the bottom of the bore, said movable means either blocking the bore, or a passage in the tool or tool shaft.

(1) Note. For classification herein, the flow stopping means must be described as capable of at least preventing the downward flow of fine material such as sand or silt.

(2) Note. If the flow stopping means comprises a line pressure responsive device or check valve, the valve must be capable of stopping downward flow when higher pressure exists on the upper side thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

317+, and the search there noted for means movable relative to a tool or shaft to control a below ground passage.

SEE OR SEARCH CLASS 73, Measuring and Testing,

863+, for a sampler of general utility.