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To all whom it may concern: Be
it known that I, FRED M. LOCKE,
of Victor, in the county of Ontario, in the State of New York, have
invented new and useful Improvements in Insulators, of which the
following is a full, clear, and exact description. This
invention relates to certain improvements in insulators and to a
composition for forming insulators for high potential electric
conductors and is closely related to my application Serial No.482,382
for the manufacture of insulators for high potential electric
conductors, filed March 9, 1909, and refers more particularly to a
composition electric insulator as a new article of manufacture, the
ingredients of which are boron or a boron compound in combination with a
vitrifiable or fusible base and, although this base may be composed of
glass ingredients or porcelain ingredients or may be an aluminum
silicate, such as feldspar, yet I prefer to use simply silica or any
fusible silica base. The
primary object of my present invention is to increase the inductive
capacity, dielectric strength, and heat resisting properties of this
class of insulators to more effectively resist puncture or
disintegration by an electric current or static charges therefrom, or
from temperature or climatic changes. The
broad basic idea of the invention consists in incorporating a suitable
quantity of boron or, in view of the difficulty and expense of procuring
pure boron, boron in some of its compound forms, in a vitrifiable or
fusible base, such as glass ingredients, porcelain ingredients, an
aluminum silicate or a fusible silica base to increase the inductive
capacity, dielectric strength and resistance to puncture or
disintegration by the electric current and sudden temperature and
climatic changes and reference is hereby made to my co-pending
application Serial No.802,295 which contains the broad claims to boron
in combination with a vitrifiable or fusible base, and which application
is likewise closely related to my co-pending application Serial No.
482,382 so far as said application, Serial No. 802,295, describes and
claims a vitrifiable or fusible base in combination with boron. Reference is also hereby made to my co-pending application serial No. 497,095, plastic compositions, filed May 19, 1909, in which
I have claimed a particular form of vitrifiable or fusible base in
combination with a boron compound. As
an example of the advantages of an insulator formed of the ingredients
herein described, in the experiments which I have made to determine the
relative specific inductive capacity of air, glass, porcelain and this
composition, I find that the specific inductive capacity of this
composition is three times as great as that of the commercial porcelain
insulators of the same size and form; six times as great as glass, and
twelve times as great as air. In the tests which I have made to determine the resistance to puncture by high voltage, I find that where a |
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porcelain
insulator of the best quality was capable of resisting 80,000
volts, an insulator made of my improved composition and of the same size
and form as the porcelain insulator withstood 100,000 volts, or 20,000
volts more than the porcelain insulator which was due solely to the
increased specific inductive capacity and dielectric strength produced
by the boron or boron compound. This high inductive capacity and
dielectric strength is probably due to the fact that boron and hydrogen
form no compound or compounds under fusion and except in one or two
special instances, and under special circumstances boron forms no
compound whatsoever with hydrogen. The
manufacture of high potential porcelain insulators is well understood
and in the formation of an insulator from my improved composition; the
boron or the boron compound; such as borax, boracic acid etc. and the
base ingredient or ingredients are thoroughly mixed in suitable
proportions, the proportion of boron or of the boron compound ranging
anywhere from 1% to 60%, according to the specific inductive capacity
required, although the smallest percentage is effective in adding
materially to the dielectric strength and tenacity of the insulator, and
then molding and firing the composition mass in the usual manner of
forming Insulators, or in any other desirable manner. The invention herein relates to a structure adapted to serve as an
insulator in the technical meaning of the term as applied to an article
of manufacture, and the terms "insulating support for line
conductors" and "insulator for high potential electric conductors"
are used in the claims herein to clearly define such structure as an
article of manufacture to serve as an insulator in the technical meaning
of the term. What
I claim is: 1.
An insulator for high potential electric conductors comprising silica
and a boron compound fused together in a homogeneous body. 2.
An insulator for high potential electric conductors comprising a fusible
silica base and a boron compound fused together in a homogeneous body. 3.
An insulator for high potential electric conductors comprising silica
and a boron compound fused together into a homogeneous body, molded and
fired. 4.
An insulating support for line wires formed of a composition body
comprising silica and a boron compound. 5.
An insulating support for line conductors comprising a fusible silica
base and a boron compound fused together in a homogeneous body 6.
An. insulating support for line conductors comprising silica and a boron
compound fused together in a homogeneous body.
In witness whereof I have hereunto set my hand this 5th day of
March, 1914. FRED
M. LOCKE. Witnesses: A.
S. NEWELL, D. S. BARRY. |