Improvements in Insulators for Fastening Electric Wires.
Year: 1899

page_text: Date of Application, 24th Jan., 1899 -Accepted, 29th Apr., 1899
COMPLETE SPECIFICATION.
Improvements in Insulators for Fastening Electric Wires.
. I, JOHN TRELEAVEN, Cordova Street, Vancouver, British Columbia, Canada,
Electrician, 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 relates to improvements in wire fastening to that class of insulators
employed in wiring where the strain and pull of the wires is comparatively light,
such as in buildings and where light wiring only is required; and my object is
to provide an insulator that, by its peculiar and novel form may be secured to
the wire with a minimum of trouble and delay, and without the service of an extra
wire for tying the main wire to the insulator.
I attain this object by the device illustrated in the accompanying drawing, in
which-
Fig. 1 is my insulator, showing the peculiar downwardly looped groove.
Fig. 2 shows how the tie is made with the depending groove on the left side,
and Fig. 3 shows the tie on the right side, and
Fig. 4 shows a plan of the insulator inverted.
The Figs. 2 and 3 are intended to show the fastening when the major strain
on the wire is supposed to be in the direction of the arrow, in each case.
is a left hand and the other a right hand tie.
The one
In describing the features of my invention I employ numerals to designate
corresponding parts throughout the several views.
My insulator is provided with a cylindrical body, as in the usual style; but
instead of the annular groove encircling its top for the wire I provide a groove 10
as shown, passing round for approximately half the circumference; and a groove 11
on the opposite side having a depending curve 11, the opposite ends of which pass
obliquely upwards and intersect the opposite ends of the groove 10 at points about
on opposite sides of the insulator.
The insulator is secured by a screw passing through the aperture 12 in its
centre and to prevent it from turning on the screw, and thus deranging the tie
I provide teeth 13, which it is obvious may be of any pattern, so long as the
insulator is anchored sufficiently to prevent it from turning.
As shown in Fig. 2 when the major strain on the wire a is in the direction of
the arrow the wire continuing that way should cross the return wire just over the
right hand side of the depending groove 11, and when the strain is reversed, as in
Fig. 3. the operation is reversed. This binds the wire having the minor strain
in the right or left side of the oblique groove 11 and prevents it from being dis-
placed therefrom. In making the fastening the insulator is secured down with
the depending groove facing in line with the wire a, a loop is then formed and
the wire is passed round the grooves 10 and 11 and the pulling end of the wire
is passed over the return wire at 14.
By reversing the loop to the opposite sides of the insulator the fastening would
act for the tension reversed.

page_text: In the event of the tension each way from the insulator being approximately the
same, the fastening may then be made on either side.
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:
-
In an article of manufacture, an insulator having a groove 10 passing approxi-
mately half way round near its top, a groove 11 on the opposite side curved down-
wards and intersecting the opposite ends of the groove 10, the said intersections
being angling obliquely to the plane of the said groove 10, and means for prevent
ing the insulator from turning when fastened, as specified.
Dated this 30th day of December 1898.
WILLIAM G. TRETHEWEY.
Agent.