Ceramic elements and insulation assembly including such elements

Claim 1

A high temperature furnace insulation assembly including, in combination with a furnace wall and a body of flexible insulation material, a fastener supporting said body on said furnace wall, wherein the improvement comprises: said fastener including a socket attached at its inner end to said furnace wall; a removable and replaceable, unitary ceramic pin inserted into said socket and over which pin said body is impaled, and a ceramic washer holding said body in place on said pin between said furnace wall and said washer; said pin having an inner end portion provided with an annular groove, and an outer end portion having a reduced part and an external and inwardly facing, annular shoulder; said socket having flexible wall means slid over said inner end portion and provided at the outer end of said socket with interior lip means snap fit into said groove, and a ceramic washer moved on said outer end portion and including an aperture defining two intersecting through openings having intersections separated by spacing larger than said reduced part but smaller than said outer end portion, with one of said openings being larger than said outer end portion, and the other of said openings being alignable with said reduced part and including an inner part larger than said reduced part but smaller than said outer end portion, an outer part larger than and removably engagable with said outer end portion, and an internal and outwardly facing, greater than semi-annular shoulder removably engaging said external shoulder.