Casing guide

Claim 1

IN A CASING GUIDE ADAPTED FOR MOUNTING ON A WELL CASING, THE COMBINATION OF A PAIR OF CIRCULAR COLLARS AXIALLY ALIGNED AND SPACED FROM ONE ANOTHER, A PLURALITY OF GUIDE MEMBERS EXTENDING BETWEEN SAID COLLARS AND EACH HAVING ITS OPPOSED ENDS CONNECTED RESPECTIVELY WITH SAID COLLARS, EACH COLLAR COMPRISING A SHEET METAL SHELL OF SUBSTANTIALLY UNIFORM WALL THICKNESS HAVING PROGRESSIVELY INWARDLY STEPPED BANDS FORMED IN THE WALL WITH THE BAND OF THE GREATEST INSIDE DIAMETER AT THE OUTER END OF THE COLLAR AND JOINED TO THE ADJACENT BAND BY A CIRCUMFERENTIAL BAND PROVIDING AN ANNULAR SHOULDER, THE RESPECTIVE END PORTIONS OF THE GUIDE MEMBERS LYING ADJACENT AND SECURED TO THE INSIDE OF THE OUTER BANDS WITH THE EXTREME ENDS OF THE GUIDE MEMBER AT EACH COLLAR TERMINATING SHORT OF THE END OF THE COLLAR, EACH COLLAR HAVING ITS OUTER END FORMED AS A CIRCUMFERENTIALLY EXTENDING INWARDLY DEPRESSED RIB HAVING ONE WALL ENGAGING THE EXTREME ENDS OF THE GUIDE MEMBERS ASSOCIATED THEREWITH, SAID GUIDE MEMBERS HAVING OUTWARDLY BOWED PORTIONS EXTENDING FROM SAID END PORTIONS THROUGH APERTURES IN SAID COLLARS AND CENTRAL ZONES DEPRESSED TOWARD SAID AXIS WHEREBY TO PROVIDE EACH GUIDE MEMBER WITH A DOUBLE BOW, EACH SAID CENTRAL ZONE PROVIDED WITH A LATERAL JOG OPERABLE TO PERMIT RESILIENT DEFORMATION OF SAID GUIDE MEMBERS IN RESPONSE TO LONGITUDINALLY APPLIED COMPRESSIVE FORCES ON THE ENDS OF THE GUIDES.