Electrical insulator constructions

Claim 1

AN ELECTRICAL INSULATOR DEVICE COMPRISING A BODY ELEMENT AND AN INITIALLY SEPARATE SKIRT ELEMENT INTERFITTED WITH THE BODY ELEMENT AND PERMANENTLY BONDED THERETO, SAID BODY ELEMENT BEING FORMED OF INSLUATING MATERIAL HAVING HIGH MECHNICAL STRENGTH AND SAID SKIRT ELEMENT BEING FORMED OF INSULATING MATERIAL CHARACTERIZED BY HIGH TRACKING RESISTANCE AND HIGH ARC TRACK RESISTANCE; AND BODY ELEMENT COMPRISING, A PAIR OF OPPOSITE END SURFACES DISPOSED IN SPACED APART PARALLEL PLANES WITH THE SAID END SURFACES EACH BEING SYMMETRICAL WITH RESPECT TO A COMMON AXIS WHICH IS NORMAL TO THE PLANES IN WHICH SAID SURFACES LIE AND WHICH AXIS ALSO DEFINES THE LONGITUDINAL AXIS OF THE BODY ELEMENT, A BODY PORTION SYMMMETRICAL IN AN COAXIAL WITH THE SAID LONGITUDINAL AXIS OF THE BODY ELEMENT AND DISPOSED AXIALLY BETWEEN SAD END SURFACES BUT BEING OF LARGER CROSS SECTIONAL AREA THAN THE CROSSSECTIONAL AREA OF AT LEAST ONE OF SAID END SURFACES, THE AXIAL EXTENT OF SAID SYMMETRICAL BODY PORTION BEING LESS THAN THE SPACING BETWEEN SAID END SURFACES, A RADIALLY OUTWARDLY FLARING SURFACE EXTENDING AXIALLY INWARD FROM SAID AT LEAST ONE END SURFACE TO THE END OF SAID SYMMETRICAL BODY PORTION CLOSEST TO THAT END SURFACE, AND MEANS EXTENDING AXIALLY INTO THE BODY ELEMENT FROM EACH END SURFACE FOR EFFECTING MECHANICAL CONNECTIONS THERETO; SAID SKIRT ELEMENT COMPRISING, AN AXIALLY APERTURED HUB PORTION HAVING UPPER AND LOWER ENDS DISPOSED IN PARALLEL PLANES ORTHOGONAL TO THE LONGITUDINAL AXIS OF THE SKIRT ELEMENT, AND ANNULAR SKIRT PORTION EXTENDING RADIALLY OUTWARD FROM THE UPPER END OF SAID HUB PORTION AND TURNING AXIALLY DOWNWARD TOWARD THE LOWER END OF SAID HUB PORTION WITH THE INNER SURFACE OF THE ANNULAR SKIRT BEING SPACED RADIALLY OUTWARD FROM THE OUTER AXIALLY EXTENDING SURFACE OF SAID HUB PORTION, THE INNER AXIALLY EXTENDING SURFACE OF SAID HUB WHICH DEFINES THE AXIAL APERTURE THROUGH SAID HUB FLARING RADIALLY OUTWARD AS IT EXTENDS FROM THE HUB UPPER END TOWARD THE HUB LOWER END TO PROVIDE AN PAERTURE SHAPED COMPLEMENTALLY TO THE SAID FLARED SURFACE OF THE BODY ELEMENT, SAID BODY ELEMENT PROJECTING AXIALLY THEREINTO AND BEING PERMANENTLY BONDED THERETO BY AN INTERVENING FILM OF BONDING MATERIAL.