Well pipe scraping and sealing device

Claim 1

A SCRAPING AND SEALING DEVICE FOR MOVEMENT IN THE BORE OF A WELL PIPE BETWEEN STOPS INCLUDING A PISTON HAVING A LONGITUDINAL BORE AND AN EXTERNAL CIRCUMFERENTIAL GROOVE, SEGMENTAL RING MEANS MOUNTED IN THE GROOVE FOR EXPANSION AND RETRACTION INTO AND OUT OF SEALING ENGAGEMENT WITH THE PIPE BORE, MEMBERS MOVABLE TRANSVERSELY OF THE PISTON BETWEEN ITS BORE AND GROOVE FOR EXPANDING AND RETRACTING THE RING MEANS, ACTUATING MEANS SLIDABLY MOUNTED IN THE BORE OF SAID PISTON FOR MOVING THE MEMBERS INWARDLY AND OUTWARDLY TO EXPAND AND RETRACT SAID RING MEANS BY UPWARD AND DOWNWARD RECIPROCATION, PUSH RODS AT THE ENDS OF THE ACTUATING MEANS AND PROJECTING AXIALLY FROM SAID PISTON FOR ENGAGEMENT WITH THE STOPS TO RECIPROCATE SAID ACTUATING MEANS TO AND FROM AN UPPER EXPANDING POSITION AND A LOWER RETRACTION POSITION, SAID PISTON BORE HAVING END PORTIONS OF REDUCED DIAMETER FOR RECEIVING THE BUSH RODS AND AN ENLARGED PORTION ADJACENT AND INWARDLY AT LEAST ONE OF THE REDUCED END PORTIONS, AN ENLARGED HEAD ON THE INNER END OF AT LEAST ONE OF SAID PUSH RODS MOVABLE BETWEEN SAID PISTON BORE AND THE ENLARGED BORE PORTION UPON RECIPROCATION OF THE PUSH RODS, MEANS LOOSELY CONNECTING THE HEAD OF SAID PUSH ROD TO SAID ACTUATING MEANS TO PERMIT LIMITED RELATIVE RECIPROCAL MOVEMENT OF SAID HEATED ROD AND HAVING AT LEAST A PORTION THEREOF MOVABLE BETWEEN SAID PISTON BORE AND ITS ENLARGED PORTION UPON RECIPROCATION OF SAID ACTUATING MEANS, A PLURALITY OF BALLS LOOSELY CONFINED BY THE CONNECTING MEANS IN SURROUNDING RELATION SAID PUSH ROD FOR INWARD AND OUTWARD TRANSVERSE MOVEMENT AND RECIPROCAL MOVEMENT WITH SAID CONNECTING MEANS BETWEEN SAID PISTON BORE AND ITS ENLARGED PORTION, A FIRST SPRING FOR CONSTANTING URGING SAID HEADED ROD OUTWARDLY AND FOR HOLDING ITS HEAD BETWEEN THE BALLS WHEN SAI D HEAD AND BALLS ARE IN SAID ENLARGED BORE PORTION TO RELEASABLY LOCK SAID ACTUATING MEANS IN ONE OF ITS POSITION, SAID ACTUATING MEANS BEING RECIPROCATED INTO THE LATTER POSITION BY INWARD MOVEMENT OF THE OTHER PUSH ROD, AND A SECOND SPRING OF GREATER STRENGTH THAN THE FIRST SPRING FOR CONSTANTLY URGING SAID ACTUATING MEANS INTO THE OTHER OF ITS POSITIONS SO AS TO DISPOSED SAID HEAD AND BALLS WITHIN SAID PISTON BORE WHEREBY INWARD MOVEMENT OF SAID HEADED ROD MOVES ITS HEAD FROM BETWEEN SAID BALLS AS WELL AS RECIPROCATES SAID ACTUATING MEANS TO PERMIT SAID BALLS TO MOE FROM SAID ENLARGED BORE PORTION INTO SAID PISTON BORE, THE GREATER STRENGTH OF THE SECOND SPRING HOLDING SAID ACTUATING MEANS IN THE LATTER POSITION UNTIL IT IS RECIPROCATES BY INWARD MOVEMENT OF SAID OTHER PUSH ROD SO AS TO GAIN DISPOSE SAID HEAD AND BALLS IN SAID ENLARGED BORE PORTION.