Improvements in Electric Wire Insulators
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Electric Wire Insulators
I, ARTHUR WEST HEAVISIDE of 7 Grafton Road, Whitley. Newcastle-upon-Tyne,
Superintending Engineer postal Telegraphs, North East (North) District 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 :-
My invention has for its object the production of a terminal insulator so constructed
as to render the insulation of suspended wires more perfect than is attainable with the
terminal insulators ordinarily in use, and to reduce the cost of construction and
maintenance of the said wires.
To effect these objects I let the insulator and bolt move at either end upon an axis
or attachment to the arm of a pole or other support whilst the wire is fastened to
the other end and by its tension pulls the insulator round so as to bring the wire to
the same level as the axis.
For the more complete understanding of this invention, I shall now more par-
ticularly describe it and refer to the two figures in the annexed drawings representing
two ways of carrying it out.
In fig. 1 showing form of my invention, A is the insulator and B its bolt or
shackle which is supported at D, the axis referred to The wire W is passed through
the channel E E in the top of the insulator, and then bound externally as shown. I
prefer the bolt to bo curved as shown, in order to let the rain drip off at X. I prefer
the hole on channel E E to be so placed that the tension of the wire when it is fixed,
may pull the insulator into the slanting position shown, in order to prevent the passage
of rain into the interior of the insulator Thus with a circular channel for the wire,
it is preferably made in the vertical plane containing the bolt and D, and the centre of
the channel should be somewhat below the line which is the prolongation of the axis
of the holt as shown
As
In fig 2 showing form D of my invention, the wire W is fastened at the other end,
viz. to the bolt R whilst the insulator A has for its supporting axis a bolt C through
the top of the insulator passing through the shackles S and secured by a nut
before the bolt R is curved as shown to let the rain drip at X and the position of the
horizontal axis C is below the continuation of the axis of the bolt R so as to make the
insulator slant when the wire is fixed.
By this invention, I secure the following advantages.
(1) Far more perfect insulation than with the common terminal insulators which
are notoriously imperfect
(2) An avoidance of the mechanical stress to which insulators are subjected when
wires are fixed in the ordinary way.
Having thus particularly described my invention and in what manner it is to be
performed, I declare that what I claim is -
Claim I The combination of an insulator fitted with a bent bolt, or rod, the
insulator being made fast to one end of the bolt and its support to the other end of
the bolt And, for the purpose of supporting the wire, the top of the insulator is
provided with a channel preferably circular whose centre 14 preferably eccentric to the
axis of the insulator and round which the electric wire is made fast.
Claim II. The combination of an insulator fitted with a bent holt, or rod, the electric
wire being made fast to one end of the bolt, and the insulator to the other end of the
C

page_text: bolt; the insulator, itself, being attached to its support by means of ordinary shackles
bolted through a hole preferably in the top of the insulator, at right angles, and
preferably eccentric to the axis of the insulator.
A. W. HEAVISIDE