Well pressure control apparatus with protector device

Claim 1

THE COMBINATION OF A WELL INSTALLATION HAVING OUTER CASING, A BODY MEMBER ADAPTED TO BE ATTACHED TO AND SUPPORTED ON THE UPPER END OF THE CASING, SAID BODY MEMBER HAVING A VERTICAL OPENING AXIALLY THERETHROUGH, SAID OPENING HAVING A RELATIVELY ENLARGED UPPER BOWL PORTION, A RESTRICTED LOWER PORTION AND A WEAR PROTECTOR RING IN SAID BOWL PORTION, MEANS RELEASABLY SECURING THE RING TO THE BODY, SAID RING HVING ANNULAR GROOVES ON ITS INTERIOR SIDE, AN ANNULAR MEMBER HAVING RECESSES AT ITS OUTER PERIPHERY, FINGERS PIVOTALLY MOUNTED ON THE ANNULAR MEMBER IN SAID RECESSES, SAID FINGERS BEING ENGAGED WITH AND LATCHED INTO SAID GROOVE, MEANS RESILIENTLY BIASING THE OUTER ENDS OF THE FINGERS TO A PROTRACTED POSITION ON THE EXTERIOR OF THE RECESSES, THE CROSS-SECTIONAL CONFIGURATION OF THE GROOVES BEING RIGHT TRIANGULAR, THE HYPOTENUSES THEREOF LYING INWARDLY AND FACING EACH OTHER.