Rotary stripper for well pipe strings

Claim 1

A ROTARY STRIPPER FOR WELL PIPE STRINGS, COMPRISING A TUBULAR BODY ATTACHABLE TO A WELLHEAD FITTING THROUGH WHICH A PIPE STRING IS MOVED, INTERNAL SHOULDER MEANS IN THE BORE OF THE BODY, A STRIPPER ASSEMBLY MOUNTED IN THE BORE OF SAID BODY, MEANS ROTATABLY SUPPORTING SAID ASSEMBLY ON SAID SHOULDER, SAID STRIPPER ASSEMBLY INCLUDING A HANGER RING, A FLEXIBLE RESILIENT STRIPPER ELEMENT PENDENT FROM SAID HANGER RING, THE EXTERIOR OF SAID STRIPPER ELEMENT BEING OF DOWNWARDLY TAPERING FRUSTOCONICAL SHAPE AND HAVING AN AXIAL BORE DIMENSIONED TO CONSTRICTIVELY SEAL ABOUT A PIPE STRING EXTENDING THERETHROUGH, A METALLIC REINFORCING COLLAR COMPRISING A PLURALITY OF COMPLEMENTARY SEGMENTS MOLDED INTO THE BORE WALL OF SAID STRIPPER ELEMENT SPACED FROM ITS LOWER END, SAID SEGMENTS BEING HINGEDLY SECURED TO SAID HANGER RING FOR RADIAL MOVEMENT WITH THE EXPANSION AND CONTRACTION OF SAID STRIPPER ELEMENT, AN UPWARDLY EXTENDING TUBULAR SLEEVE SECURED TO THE HANGER RING IN CONCENTRIC SPACED RELATION TO SAID BODY TO DEFINE AN ANNULAR SPACE THEREBETWEEN, A TUBULAR BUSHING EXTENDING INTO SAID ANNULAR SPACE AND THREADEDLY SECURED TO SAID BODY, SAID ROTATABLE SUPPORTING MEANS INCLUDING ANTIFRICTION BEARING MEANS POSITIONED IN SAID ANNULAR SPACE BETWEEN SAID BUSHING AND SAID STRIPPER ASSEMBLY, AND MEANS SEALING BETWEEN SAID SLEEVE AND SAID BUSHING.