Retractable sampling device for pressurized conveyors

Claim 1

A SAMPLING DEVICE FOR PRESSURIZED CONVEYING LINES COMPRISING, A FRAME HAVING A TUBULAR PORTION WITH A FLANGE AT ONE EXTREMITY ADAPTED TO BE MOUNTED ON A CONVEYING LINE FOR MATERIAL TO BE SAMPLED AND CONVEYED UNDER PRESSURE, SAID FLANGE BEING ADAPTED TO BE POSITIONED AROUND AN APERTURE IN THE CONVEYING LINE, A SAMPLING TUBE SEALED AT ONE EXTREMITY AND SLIDABLY MOUNTED IN THE TUBULAR PORTION OF THE FRAME BEING ADAPTED TO MOVE BETWEEN AN EXTENDED POSITION WHEREIN THE SAMPLING TUBE PROJECTS OUT OF THE TUBULAR PORTION A GIVEN DISTANCE AND A RETRACTED POSITION WHEREIN THE SAMPLING TUBE IS POSITIONED WITHIN THE TUBULAR PORTION WITH ITS SEALED EXTREMITY SUBSTANTIALLY FLUSH WITH THE END OF TUBULAR PORTION, MOTIVE MEANS FOR RECIPROCATING THE SAMPLING TUBE WITHIN THE TUBULAR PORTION BETWEEN SAID POSITIONS, SAID SAMPLING TUBE HAVING A SAMPLE OPENING POSITIONED THEREIN AND EXPOSED IN THE PORTION OF THE SAMPLING TUBE WHICH PROJECTS BEYOND THE END OF THE TUBULAR PORTION OF THE FRAME IN SAID ONE OF SAID POSITIONS, AUGER MEANS POSITIONED WITHIN THE SAMPLING TUBE AND HAVING AN ACTUATING SHAFT EXTENDING OUT OF THE SAMPLING TUBE IN THE RETRACTED POSITION, SAID FRAME HAVING AN OPENING IN THE TUBULAR PORTION THEREOF AND ADAPTED TO MATE WITH A SECOND OPENING IN THE SAMPLING TUBE REMOTE FROM THE SAMPLE OPENING, AND MEANS COUPLED TO THE SHAFT OF THE AUGER IN THE RETRACTED POSITION OF THE SAMPLING TUBE AND ADAPTED TO ROTATE THE SAME AND TRANSPORT MATERIAL IN THE SAMPLING TUBE TO THE OPENING IN THE TUBULAR PORTION OF THE FRAME TO DISCHARGE THE SAMPLE MATERIAL.