Interior pipe coating device

Claim 1

APPARATUS FOR APPLYING FLUID COATING MATERIAL TO THE INTERIOR SURFACE OF A TUBE COMPRISIKNG, A LONGITUDINALLY MOVABLE RESILIENT ANNULAR CLOSURE MEANS HAVING FLUID MATERIAL INLET MEANS AND BEING MOVABLE WITHIN A TUBE TO BE COATED, SAID ANNULAR CLOSURE MEANS BEING IMPERFORATE EXCEPT FOR SAID INLET MEANS AND OF AN OUTSIDE DIAMETER TO ENGAGE SAID INTERIOR SURFACE FOR RESTRICTING THE FLOW OF THE COATING MATERIAL AHEAD OF THE ANNULAR CLOSURE MEANS AS THE APPARATUS IS MOVED WITHIN SAID TUBE TO COAT THE INNER SURFACE THEREOF, RESILIENT ANNULAR GAUGE MEANS, CHAMBER MEANS HAVING OUTLET JKPORT MEANS COMMUNICATING WITH SAID INLET MEANS AND FIXEDLY COUPLED INTERMEDIATE SAID ANNULAR CLOSURE MEANS AND SAID ANNULAR GAUGE MEANS AND AXIALLY MOVABLE THEREWITH, SAID ANNULAR CLOSURE MEANS AND SAID ANNULAR GAUGE MEANS DEFINING END PORTIONS OF A COATING MATERIAL RESERVOIR FORMED EXTERNALLY OF SAID CHAMBER WITHIN THE TUBE WHEN THE APPARATUS IS IN USE FOR RECEIVING THE COATING MATERIAL THROUGH SAID OUTLET PORT MEANS ONLY FORM INTERNALLY OF SAID CHAMBER MEANS, SAID ANNULAR GAUGE MEANS INCLUDING AN OUTER PERIPHERAL EDGE SPACED FROM THE INNER WALL OF THE TUBE TO BE COATED WHEN THE PPARATUS IS IN USE AND ADAPTED TO PROVIDE AN ANNULAR COATING MATERIAL PASSAGE THEREBETWEEN FOR DEPOSITING A LAYER OF PREDETERMINED THICKNESS OF THE COATING MATERIAL ON THE INNER SURFACE OF THE TUBE FROM SAID RESERVOIR AS THE APPARATUS AND THE TUBE ARE MOVED RELATIVE TO EACH OTHER.