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Toughened glass, pin type insulator

阅读:102发布:2020-09-23

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1. A MOULDED GLASS INSULATOR BLANK INTENDED FOR USE IN THE MANUFACTURE FROM THE BLANK OF A TOUGHENED GLASS INSULATOR DESIGNED FOR SUPPORTING AN ELECTRIC POWER CABLE, SAID BLANK CONSISTING OF A HOLLOW HEAD CLOSED AT THE TOP AND FORMED WITH A CENTRAL CAVITY OPENING AT THE BOTTOM OF THE HEAD, A SKIRT EXTENDING RADIALLY AND DOWNWARDLY AROUND THE HEAD AND HAVING A RADIALLY-EXTENDING UPPER PORTION, AND AN INTERMEDIATE PART JOINING THE HEAD TO SAID RADIALLY-EXTENDING UPPER PORTION OF THE SKIRT, WHICH INTERMEDIATE PART COMPRISES A PART OF CYLINDRICAL FORM WHOSE AXIS COINCIDES WITH THE AXIS OF THE BLANK AND AN ANNULUS EXTENDING FROM THE HEAD SUBSTANTIALLY AT RIGHT ANGLES TO SAID AXIS AND MERGING INTO THE UPPER END OF THE CYLINDRICAL PART THROUGH AN INTEGRAL ANNULAR PART OF CURVED CROSSSECTION, WHICH SHAPE OF THE BLANK IS SUCH THAT ON TEMPERING THE BLANK A STRESS PATTERN IS INDUCED WHICH ARRESTS IN SAID INTERMEDIATE PART A FRACTURE INITIATED IN THE SKIRT.
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