Improvements in the Metal Screw, Bolt, or other Attachments for Fixing Insulators to Carry Electric Wires.
Year: 1894

page_text: Date of Application, 16th May, 1894
Complete Specification Left, 15th Feb., 1895-Accepted, 23rd Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in the Metal Screw, Bolt, or other Attachments for
Fixing Insulators to Carry Electric Wires.
I AVON GRAY Featherstone Road King's Heath Worcestershire do hereby
declare the nature of this invention to be as follows:-
The object of this invention is to protect the metal screw, bolt or other attachment
used for supporting the insulators on the poles or otherwise with a non conducting
material in order to prevent a waste of current.
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"
For this purpose I coat or encase the screw bolt or other attachment with a
plastic material now commonly called Avonite or some other non conducting
material in such a manner as to allow the insulator to screw on or off the bolt &c.
or be made a fixture.
The material herein referred to as
Specification 9958/90.
Dated this 15th day of May 1801
"Avonite " is a material described in
Improvements in the Metal Screw, Bolt, or other Attachments for
Fixing Insulators to Carry Electric Wires.
I, AVON GRAY Featherstone Road King's Heath Worcestershire Timber
Dealer do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
The object of this invention is to protect the metal screw, bolt or other attachınent
used for supporting the insulators on the poles or otherwise with a non conducting
material in order to prevent a waste of current.
For this purpose
coat or encase the screw bolt or other attachment with a
plastic material now commonly called "Avouite or some other non conducting
material in such a manner as to allow the insulator to screw on or off the bolt or
be made a fixture.
The material herein referred to as "Avonite" is a material described in
Specification 995890.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the way in which I prefer to proceed.
I take paper, torn or cut up very fine or raw cotton or wool and saturate them in
a binding material such as shellac in solution or stoving varnish and while in its
wet state cover such part of the bolt or screw as are necessary. I then place in a
room through which a current of air passes or in a slow beat in order to dry the
material. I then place it in a metal mould and subject it to a heavy pressure.
After pressing in this state I again saturate it with the binding material and leave
it a week or two to dry again, when I replace in the mould and subject it to a
heavier pressure several tons to the inch should be used. I next place it in an oven
heated to about 250 degrees Fahrenheit for about 10 hours. I then place it in the
En
1

page_text: moulds heated this time to 250 to 300 degrees in order to completely destroy the
nature of the binding material. After the hot pressing I again place it in the oven
for about 10 hours and after cooling it may be smoothed and polished ready
for use.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
.claim is
1. The covering of the screw or bolt for fixing the insulators for carrying
electric wires, with a non conducting material in order to prevent a waste of
-current.
2. The covering of such screw or bolt with the material called "Avonite" in the
method described.
3. The covering of the screw or bolt or part thereof with any good non
.conducting material.
Dated this Fourteenth day of February 1895.
AVON GRAY.