Improvements in. Insulators for Overhead and other Electric Wires.
Year: 1892

page_text: Date of Application, 22nd June, 1892-Accepted, 23rd July, 1892
COMPLETE SPECIFICATION.
Improvements in. Insulators for Overhead and other Electric Wires.
I, FRITZ MEYER, of Kaulbachstrasse No. 8, Munich in the Empire of Germany
Telegraph Clerk 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 :-
This invention relates to the carrying blocks made of insulating material to or
by which overhead or other uninsulated wires such as telegraph or telephone wires
are secured and supported on the posts brackets or equivalent supports for
carrying the said wires.
With the insulators at present generally used the disadvantage is found that the
inside of the double hanging flange on which the device principally depends for its
insulating power is difficult to clean when the insulator is in position on its support.
The dust and dirt which enter under the flange tend to destroy or diminish the
insulating power of the insulator and this is especially found to be a great practical
disadvantage when the insulators are used in any confined or other situation where
they are exposed to smoke such as in stations or railway tunnels, or in towns,
insomuch that it has been sought to avoid the disadvantage by using larger
insulators or those with deeper flanges in such positions.
01
As however the construction of the arms or posts which carry the insulators
may in many instances not permit of deeper insulators being used, it is sought by
this invention to so improve the ordinary insulator that it may possess a greater
insulating surface and be more easily cleaned without having to make it higher
than those in use.
Reference being made to the annexed drawing which shows in one view on the
left half an elevation and on the right half a section of the improved insulator;
the improved insulator is made with a projecting flange c between the head a and
the usual double flange b at its foot, the said flange being turned downwards and
forming a sort of roof like annular projection.
This flange c, in order to preserve the general form of the insulator, need not
project beyond the lower flange b or the outer mantle thereof, if however the
insulation is to be still further increased the flange c may project further. The
improved insulator possesses the following advantages
i) The surface of the insulator is increased so that if the flange c is
17 millimeters broad, which is a suitable amount, the distance to be traversed by
leak of electricity is increased by about 34 millimeters or about half as much again
as in the ordinary insulator where the total breadth of surface is about 60 to
70 millimeters.
2) In rainy weather, a dry space is left under the flange c which adds another
dry zone to the insulator and so increases its efficiency.
3) The space beneath and about the flange c can be easily cleaned at any time
and consequently maintained in its full effect.
The improved insulator may be made in any size in the same proportions as the
insulators in use.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is-
In an insulating carrier or holder for an electric wire having the head a and the
depending flange b, a flange c projecting annularly between the head a and the
flange b and downwardly bent to afford a protected groove or recess thereunder

page_text: which may be easily cleaned for the purpose of improving the efficiency of the
insulator without increase in its extreme dimensions.
Dated this 22nd day of June 1892.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.