Improvements in Porcelain and other Insulators.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Porcelain and other Insulators.
We, JOHN CRISP FULLER and GEORGE FULLER both of Newcastle Wharf
Works, Old Ford Road, Bow, in the County of Middlesex, Electricians and
Telegraph Engineers, and WILLIAM EDWARD LANGDON of The Lawn, Belper,
in the County of Derby, Electrical Engineer, 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 :-
"
Our invention refers to Improvements in Porcelain and other Insulators, such
as are generally employed for the support of aerial line wires, or conductors,
conveying currents of electricity for telegraph and other purposes, commonly
known as "line insulators
as distinguished from "terminal insulators." In such
insulators it is desirable that the surface distance, between the point at which the
conductor is attached to the insulator, and the point at which the ware of the
insulator forms a junction with its support or bolt, should be as great as possible,
because the greater the distance between the said points, the less is the loss of current
by leakage and the more efficient the insulator, and it is the primary object of our
invention to produce such an insulator as will satisfy the above requirements
combined with a simple and practical construction.
Our invention will be readily understood by the following description having
reference to the accompanying drawing whereon Figure 1 is a vertical section and
Figure 2 an elevation of an insulator constructed according to our invention,
Figure 3 being an elevation of a similar insulator hereafter referred to. Similar
letters of reference refer to like parts in the several figures.
According to our invention we form the insulator in such a manner as to provide
three or more deeply cut vertical grooves or channels, such as A A A, Fig. 1,
thereby practically forming a triple shed, such as B B B. The proportionate
depth of these channels may be as shown at Fig. 1 or they may be varied somewhat
to suit requirements, we have however found the construction or proportions shown
to be suitable generally, it being convenient that the lower portion of the inner
sheds should be capable of easily cleansing, and be washed by rain, when in their
position on the poles or other supports.
The surfaces of the insulators according to our invention may be plain upon their
outer surfaces as shown at Figure 2 or serrated with concentric rings as shown at
Figure 3, such serrations being described in the Specification of Patent No. 4450
dated September 19th 1882 granted to ourselves.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what we
claim as our Improvements in Porcelain and other Insulators is as follows:
1. The arrangement and construction of three or more deeply cut vertical grooves
or channels the one extending below the other, whereby the surface distance
between the conductor and the bolt is increased all substantially as and for the
purposes described and illustrated with reference to the accompanying drawings.
[Paine 17

page_text: 2. The combination with an insulator having deeply cut grooves or channels,
and as claimed by Claim 1, of the serrated surface in the form of concentric rings,
all constructed and arranged substantially as and for the purposes hereinbefore
described.
Dated this 3rd dar of Anmil 1801
BREWER & SON,
London and Leeds, Agents for Applicants.