Paraffin scraper

Claim 1

A PARAFFIN CLEANER FOR FLOWING WELLS INCLUDING, AN ELONGATE CENTRALLY BORED UPPER BODY HAVING CLOSED UPPER AND LOWER ENDS; AN ELONGATE LOWER BODY HAVING AN UPSTANDING INTEGRALLY CONNECTED ROD ON ITS UPPER END, THE UPPER END OF SAID ROD LONGITUDINALLY DISPOSED WITHIN AND SLIDABLY CONNECTED TO THE LOWER END OF SAID UPPER BODY; A CYLINDRICAL MEMBER SLIDABLY DISPOSED ON SAID ROD; LINKAGE PIVOTALLY CONNECTED INTERMEDIATE ITS ENDS AND CONNECTING SAID MEMBER WITH THE UPPER END OF SAID LOWER BODY, SAID LINKAGE PIVOTING OUTWARDLY RELATIVE TO SAID ROD UPON DOWNWARD MOVEMENT OF SAID MEMBER; RESILIENT PACKING ENCIRCLING AND CARRIED BY SAID CYLINDRICAL MEMBER AND THE UPPER ENDS OF SAID LINKAGE, SAID LINKAGE RADIALLY EXPANDING THE LOWER END OF SAID PACKING UPON DOWNWARD MOVEMEMT OF SAID OF SAID CYLINDRICAL MEMBER TO PARTITION A WELL PIPE IN WHICH IT IS POSITIONED TO RECEIVE THRUST FROM THE WELL FLOW TO RAISE SAID BODIES; SCRAPERS CARRIED BY AND INTEGRAL WITH THE LOWER END OF SAID PACKING; A LATCH PIVOTALLY CARRIED BY THE WALL OF SAID UPPER BODY FOR HOLDING SAID ROD AND SAID LOWER BODY IN RAISED RELATION WITH SAID UPPER BODY UPON CONTACT OF THE LOWER END OF SAID LOWER BODY WITH THE WELL BOTTOM; A LATCH-ROD IN CONTACT WITH SAID LATCH AND SLIDABLY CARRIED AXIALLY BY THE UPPER END OF SAID BODY AND PROJECTING UPWARDLY THEREABOVE FOR RELEASING SAID ROD UPON CONTACT OF THE UPPER END OF SAID LATCH-ROD WITH THE WELL HEAD; AND A HELICAL SPRING AXIALLY DISPOSED AROUND SAID ROD BETWEEN THE LOWER END OF SAID UPPER BODY AND THE UPPER END OF SAID CYLINDRICAL MEMBER URGING SAID CYLINDRICAL MEMBER IN A DOWNWARD DIRECTION WHEN SAID ROD IS IN LATCHED POSITION AND FOR FORCING SAID BODIES APART WHEN SAID ROD IS IN AN UNLATCHED POSITION THEREBY ALLOWING CONTRACTION OF SAID PACKER FOR PERMITTING THE FLOW OF WELL FLUID THEREAROUND AND THE FREE FALL OF THE CLEANER BY GRAVITY TOWARDS THE WELL BOTTOM.