Apparatus for draining underground strata

Claim 1

APPARATUS FOR VACUUM DRAINAGE OF UNDERGROUND STRATA, SAID APPARATUS INCLUDING A RISE CONDUIT HAVING AN UPPERMOST END PORTION AND A LOWERMOST END PORTION; DRAINAGE INTAKE MEANS CONNECTED TO SAID RISER CONDUIT AT SAID LOWERMOST END PORTION; PUMP MEANS WITHIN SAID RISER CONDUIT ABOVE THE DRAINAGE INTAKE AT SAID LOWERMOST END PORTION, INCLUDING A VALVED RECIPROCATING MEMBER; AN ELONGATE MEMBER EXTENDING DOWNWARDLY FROM SAID UPPERMOST END PORTION TO AND SECURED TO THE UPPER SAID OF SAID RECIPROCATING MEMBER; RECIPROCATING MEANS FOR RECIPROCATING SAID ELONGATE MEMBER AND DISPOSED AT SAID UPPERMOST END PORTION; A HOLLOW JOINT SECURED TO SAID LOWERMOST END PORTION AND HAVING JETTING PORTS OPENING EXTERIORLY THEREOF AND CHECK VALVE MEANS FOR PREVENTING FLOW OF DRIANAGE FROM SAID PORTS TO SAID PUMP MEANS; A SCREEN ENCLOSING AND CARRIED BY SAID RISER CONDUIT AND IN COMMUNICATION WITH SAID PUMP ABOVE SAID CHECK VALVE AND AT LEAST DRAINAGE INTAKE MEANS, SAID SCREEN EXTENDING FROM SAID DRIANAGE INTAKE MEANS UPWARDLY ABOUT SAID RISER CONDUIT AND PROVIDED WITH CLOSURE AND ATTACHING MEANS FOR DETACHABLY SECURING IT TO SAID RISER CONDUIT SPACED ABOVE SAID DRAINAGE INTAKE MEANS; SAID SCREEN HAVING SEMI-CYLINDRICAL CORRUGATED WALLS HAVING INWARDLY-EXTENDING CRIMPED LONGITUDINAL EDGE PORTIONS AND MEANS JOINING SAID WALLS AT SAID CRIMPED PORTIONS; SAID CRIMPED PORTIONS PROVIDING LUGS TO SAPCE SIAD SEMI-CYLINDRICAL WALLS FROM SAID RISER CONDUIT.