Magnetic pipe inspection device with pivotally mounted sensor means

Claim 1

APPARATUS FOR INSPECTING ELONGATE MEMBERS MOVING LONGITUDINALLY THROUGH THE APPARATUS COMPRISING: (A) A FRAME; (B) SAID FRAME INCLUDING A PAIR OF PARALLEL, LONGITUDINALLY SPACED BASES; (C) MEANS CONNECTED BETWEEN SAID BASES TO MAINTAIN THEM FIXED IN SPACED RELATION; (D) EACH OF SAID BASES INCLUDING A PAIR OF PLATE MEMBERS HAVING CENTRAL OPENINGS THERETHROUGH; (E) COIL MEANS CARRIED BY EACH OF SAID BASES; (F) SAID COIL MEANS HAVING SUPORT MEANS INCLUDING SLEEVES EXTENDING LONGITUDINALLY ADJACENT THE CENTRAL OPENING FORMED IN SAID PLATE MEMBERS; (G) SAID COIL MEANS FORMING AN AIDING LONGITUDINAL MAGNETIC FIELD THEREBETWEEN IN THE ELONGATE MEMBERS; (H) MEANS PIVOTALLY MOUNTED ON ONE OF SAID BASES FORMING AT LEAST A PAIR OF PIVOTAL MOUNTING AXES PARALLEL TO THE PATH OF THE ELONGATE MEMBERS; (I) AN EXTENDED ARM PIVOTALLY MOUNTED BETWEEN ITS ENDS ON EACH OF SAID LAST NAMED MEANS FOR PIVOTING EACH OF SAID ARMS ABOUT AN AXIS THAT IS PERPENDICULAR TO THE PATH OF THE ELONGATE MEMBERS; (J) SENSOR MOUNTING MEANS CARRIED NEAR ONE END OF EACH OF SAID ARMS, SAID SENSOR MOUNTING MEANS BEING PIVOTALLY CONNECTED THERETO FORMING ANOTHER AXIS WHICH IS PERPENDICULAR TO THE PATH OF THE ELONGATE MEMBERS; (K) SAID PIVOTAL MOUNTING AXES BEING SPACED CIRCUMFERENTIALLY OF THE PATH OF THE ELONGATE MEMBERS TO POSITION THE SENSOR MOUNTING MEANS AT POSITIONS SPACED CIRCUMFERENTIALLY OF THE ELONGATE MEMBERS;