Actuating device for valves in a well pipe

Claim 1

FOR USE WITHIN A WELL PIPE HAVING A PLURALITY OF LONGITUDINALLY SPACED LATERAL PORTS THERIN EACH CLOSED BY A LONGITUDINALLY MOVABLE CYLINDRICAL SLEEVE WITHIN THE WELL PIPE, THE IMPROVEMENT COMPRISING, IN COMBINATION: A PLUG ASSEMBLY ADAPTED TO MOVE THROUGH THE WELL PIPE AND TO PASS THROUGH AT LEAST ONE OF THE SLEEVES, SAID PLUG ASSEMBLY HAVING A BODY, A SEAL RING ON THE BODY FOR SLIDING CONTACT WITH THE INTERIOR OF SAID SLEEVES, A SERIES OF MOVABLE PARTS ON THE BODY EACH HAVING AN ELEMENT EXTENDING RADIALLY OUTWARD, AN EXPANDER MOUNTED FOR AXIAL MOVEMENT ON SAID BODY BETWEEN AN RETRACTED POSITION IN WHICH EACH SAID ELEMENT MAY MOVE RADIALLY INWARD TO PERMIT PASSAGE THROUGH THE INTERIOR OF A SLEEVE, TO AN EXTENDED POSITION CONTACTING SAID ELEMENTS TO PREVENT THEIR MOVEMENT RADIALLY INWARD, MEANS ON THE BODY ACTING TO MOVE SAID EXPANDER TOWARD EXTENDED POSITION, LATCH MEANS INCLUDING INTERENGAGING PARTS ON SAID BODY AND SAID EXPANDER FOR RETAINING SAID EXPANDER IN RETRACTED POSITION, AND MEANS ON THE BODY ACTUATED BY CONTACT WITH A SLEEVE FOR RELEASING SAID LATCH MEANS.