Swab cup assembly

Claim 1

IN A SWAB CUP ASSEMBLY FOR SWABBING FLUID FROM A WELL TUBING BY PULLING THE ASSEMBLY UPWARDLY THROUGH THE TUBING, THE COMBINATION OF: A BODY OF A SIZE TO MOVE FREELY THROUGH THE TUBING; A FIRST, FLEXIBLE ANNULAR LIP OF RESILIENT MATERIAL FORMED AROUND THE BODY AND BEING EXTENDING UPWARDLY AND OUTWARDLY FROM THE BODY AND BEING RESPONSIVE TO FLUID PRESSURE ABOVE THE LIP FOR DOWNWARD FLEXURE INTO SEALING ENGAGEMENT WITH THE INNER WALL OF THE TUBING; AN INTERMEDIATE ANNULAR LIP OF RESISLIENT MATERIAL FORMED AROUND THE BODY BELOW THE FIRST LIP HAVING A THICKNESS GREATER THAN THE THICKNESS OF THE FIRST LIP; SAID INTERMEDIATE LIP BEING EXTENDED UPWARDLY AND OUTWARDLY FROM THE BODY AND HAVING AN OUTER DIAMETER, IN ITS RELAXED CONDITION, LESS THAN THE INNER DIAMETER OF THE TUBING FOR THE BYPASS OF FLUID THEREAROUND ON THE DOWNWARD MOVEMENT OF THE BODY THROUGH THE TUBING, SAID INTERMEDIATE LIP BEING OF A SIZE TO BE MECHANICALLY FLEXED DOWNWARDLY AND OUTWARDLY BY THE FIRST LIP INTO SEALING ENGAGEMENT WITH THE INNER WALL OF THE TUBING; AND A COLUMN OF RESILIENT MATERIAL SECURED AROUND THE BODY BELOW THE INTERMEDIATE LIP IN A POSITION TO SUPPORT THE INTERMEDIATE LIP WHEN THE INTERMEDIATE LIP IS FLEXED INTO SEALING ENGAGEMENT WITH THE INNER WALL OF THE TUBING; SAID COLUMN, IN A RELAXED CONDITION, HAVING AN OUTER DIAMETER LESS THAN THE INNER DIAMETER OF THE TUBING FOR THE BYPASS OF FLUID THEREAROUND DURING DOWNWARD MOVEMENT OF THE BODY THROUGH THE TUBING.