US1430266A - Process for producing electrical insulating objects - Google Patents

Process for producing electrical insulating objects Download PDF

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Publication number
US1430266A
US1430266A US454930A US45493021A US1430266A US 1430266 A US1430266 A US 1430266A US 454930 A US454930 A US 454930A US 45493021 A US45493021 A US 45493021A US 1430266 A US1430266 A US 1430266A
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United States
Prior art keywords
electrical insulating
producing electrical
slate
objects
insulating objects
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Expired - Lifetime
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US454930A
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Sidler August
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Individual
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Priority to US454930A priority Critical patent/US1430266A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances

Definitions

  • This invention relates to improvements in a process for producing electrical insulating objects.
  • the object of. the present invention is a objects of slate.
  • Slate has already been used for manufacturing electrical insulators in its natural state in the shape of slabs or by forming objects of a material composed of ground slate and an admixture of a binding material and treating them bya pressing operation. Such insulators are only suited for low tension. An addition of asbestos increases the insulating power only sli htly.
  • electrical insulating objects are produced by melting natural slate, casting it into moulds and cooling it slowly.
  • the objects produced in this manner are of-a jet black colour and of a very compact vitreous structure. -They show the surprising feature that they are able to resist very high tensions like the best insulators made of porcelain.
  • Refractory slates may be treated advantageously by adding fluxes such as soda, potash and the like in order to improve the economy of the'process.
  • a process for producing electrical in-. sulating objects consisting of melting natural slate, casting said slate into moulds and cooling the molten mass slowly.
  • a process for producing electrical insulating objects consistin of grinding finely natural slate, melting sai slate, casting the molten mass into moulds and cooling it slowly.
  • a process for producing electrical insulating objects consisting of meltin natural slate to ether with additions o fluxes, casting said slate into moulds and

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Insulating Bodies (AREA)

Description

process for producing electrical insulating Patented Sept fi, 12922.
UNHTED STATES intense PATENT @FFHQE.
AUGUS'I SIDLER, 0F ZURICH, SWITZERLAND.
3T0 Drawing.
trical Insulating Objects; and I do hereby declare the following to be a clear, full, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
This invention relates to improvements in a process for producing electrical insulating objects.
The object of. the present invention is a objects of slate. Slate has already been used for manufacturing electrical insulators in its natural state in the shape of slabs or by forming objects of a material composed of ground slate and an admixture of a binding material and treating them bya pressing operation. Such insulators are only suited for low tension. An addition of asbestos increases the insulating power only sli htly.
ccording to the present invention electrical insulating objects are produced by melting natural slate, casting it into moulds and cooling it slowly.
The objects produced in this manner are of-a jet black colour and of a very compact vitreous structure. -They show the surprising feature that they are able to resist very high tensions like the best insulators made of porcelain.
Refractory slates may be treated advantageously by adding fluxes such as soda, potash and the like in order to improve the economy of the'process.
Such a process may be carried out for ex- Application filed march 23, 1921. Serial No. 454,930.
ample by grinding the slate finely, melting it in'furnaces similar to those .used in manufacturing glass, casting it into moulds and cooling it very carefully and slowly in order to revent the formation of cracks. This coo ingprocessis best carried out in similar furnaces (annealing furnaces) as those used in the glass industry. If the slate contains a large percentage of quartz, lime may be added to prevent too strong a vitrifying ac tion. A strong vitrification enhances the formation of cracks which are, as is well known, inadmissible with electric insulators.
Experiments have shown that insulating slabs of 3 m/m thickness and produced in the manner described above will stand a tension of 25000 volts.
I claim:
1. A process for producing electrical in-. sulating objects, consisting of melting natural slate, casting said slate into moulds and cooling the molten mass slowly.
2. A process for producing electrical insulating objects, consistin of grinding finely natural slate, melting sai slate, casting the molten mass into moulds and cooling it slowly.
3. A process for producing electrical insulating objects, consisting of meltin natural slate to ether with additions o fluxes, casting said slate into moulds and
US454930A 1921-03-23 1921-03-23 Process for producing electrical insulating objects Expired - Lifetime US1430266A (en)

Priority Applications (1)

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US454930A US1430266A (en) 1921-03-23 1921-03-23 Process for producing electrical insulating objects

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US454930A US1430266A (en) 1921-03-23 1921-03-23 Process for producing electrical insulating objects

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US1430266A true US1430266A (en) 1922-09-26

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US454930A Expired - Lifetime US1430266A (en) 1921-03-23 1921-03-23 Process for producing electrical insulating objects

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060184701A1 (en) * 2004-11-24 2006-08-17 Wan Sung Hur Position changing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060184701A1 (en) * 2004-11-24 2006-08-17 Wan Sung Hur Position changing apparatus

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