Year: 1896

page_text: Date of Application, 5th Sept., 1896
Complete Specification Left, 18th May, 1897-Accepted, 10th July, 1897
We THOMAS BLANKINSOP of Martin's Ferry, County Belmont, State of Ohio,
U.S.A., Glassworker, and JOSEPH WILSON BROWN of the same place, Cooper, do hereby
declare the nature of this invention to be as follows:-
The insulator of this invention is made of glass, has a head with a wire engaging
groove a screw stem for fixing it and a shoulder between the head and the stem the
connection of the shoulder with the stem being strengthened by a centrally embedded
metal plug or core upon which the insulator is moulded. A drip rim is formed around
the head at the base of the wire engaging groove so that the rim projects over the
shoulder thus preventing accumulation of ice round the base of the head and
strengthening it at the wire engaging groove. A the top, the insulator is formed with
a head adapted to receive a wrench.
Dated this 5th day of September 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicants.
We, THOMAS BLANKINSOP of Martin's Ferry, County Belmont, State of Ohio, U.S.A.,
Glassworker, and JOSEPH WILSON BROWN of the same place, Cooper, 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:-
In a glass insulator having an attaching screw stem it is important that the latter
should have its greatest strength at the shoulder of the screw which forms the joining
line of the insulator with the wooden cross arm or other part. For this purpose the
insulator is in this invention moulded upon a metal core which extends from the point
of the screw stem and crosses the shoulder into the head and thereby reinforces the
insulator at the point where it resists the greatest strain of the wire.
In the accompanying drawing Fig. 1 is a part sectional elevation of the glass
insulator of this invention with a metal reinforcing plug. Fig. 2 shews the insulator..
applied to a wooden cross arm.
A is a screw stem in connection with the head of the insulator through a shoulder b,
which makes a joint with the cross arm c and to seal this joint the shoulder has an
annular cutting projection d which, as the screw stem is driven into a hole bored in
the cross arm, cuts or bites into the surface and seals the shoulder joint, so that no
water can reach the screw hole in the arm. The head has an annular groove e, within

page_text: which the wire is secured, and above the groove terminates in an angular part f
adapted to receive a wrench whereby to drive the insulator screw stem into the bore
of the arm.
A drip rim or jacket g is formed around the head from the base of the wire engaging
groove and depends over the shoulder like an inverted cup for the purpose of preventing
the accumulation of ice around the base of the head and to strengthen it at the wire
engaging groove.
In applying the insulator a hole is bored in the cross arm or other part and a screw
thread cut therein, into which the tapering stem of the insulator is screwed, so that
the annular cutter of the shoulder will be embedded into the surface of the cross arm
outside the screw thread. The insulator can be used without other fastening for
all wire insulation and can be applied to any wooden part where a screw threaded bore
can beinade.
When the insulator is used within a building, the jacket may be dispensed with;
but as an integral part of the. insulator the jacket is of considerable advantage in
forming a table or seat for the wire in applying it in the groove.
As a band the
jacket gives increased strength to the wire bound part and serves as a hold for both
hands in screwing down the insulator.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A glass insulator for wires, having a head formed with a wire engaging groove,
and a screw stem joining the head by a shoulder, and reinforced by an embedded
metal plug or core extending above said shoulder into the head, substantially as
described and shewn.
2. A glass insulator for wires, having a screw stem terminating in a shoulder
formed with an annular cutter or thread on its joint-forming side, an annular groove
above the shoulder supplemented by an annular part, and a metallic plug or core
embedded in the screw stem and crossing the shoulder into the head, substantially as
described and shewn.
3. A glass insulator for wires, having a wire engaging groove, a screw stem
reinforced with an embedded metal plug or core and a rim or jacket depending over
the stem from the base of the groove substantially as described and shewn.
4. A glass insulator for wires, having a screw stem, terininating in a joint forming
shoulder and a head having a wire engaging groove and an annular rim or jacket
depending from the base of said groove over said shoulder, substantially as described
and shewn.
5. The glass insulator for wires formed with a screw stem terminating in a shoulder
having an annular cutter on its under side, a metal plug or core embedded into said
stem and crossing the shoulder into the head, an annular groove for said wire, an
annular rin or jacket depending over the shoulder and an angular part above the
groove, substantially as described and shewn.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicants.