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To all whom it may concern: Be
it known that I, LAWRENCE B. GRAY,
a citizen of the United States, residing at Boston, in the county of
Suffolk and State of Massachusetts, have invented a new and useful
Improvement in Insulators, of which the following is a full, clear, and
exact description, reference being had to the accompanying drawings,
forming a part of this specification, in explaining its nature. The
invention relates to an insulator especially designed for supporting
wires carrying current of high tension, and which comprises the
insulator proper adapted to be secured to a supporting peg by being
screwed upon it, and a supplemental or auxiliary insulator which
surrounds the peg and bears upon the cross-bar or other support to which
the peg is attached and which is held against said bar or support, by
the insulator proper or the wire support, the said main insulator and
auxiliary insulator being so constructed that the main one fits over in
part the supplemental one, and when screwed upon the peg to bear upon
its upper surface and clamp it against the pin, bar or support.
Such an insulator is cheaply made, and very much increases the
efficiency of the insulation. In
the drawings,-- Figure 1 is a view in plan of my improved type of
insulator, and Fig. 2 is a view in vertical section of the same. A
is the main insulator. It is of ordinary construction, excepting as
hereinafter specified, and has the interior threaded hole by which it is
adapted to be screwed to the threaded end of the holding peg B. The peg
is carried by a cross-bar b or any other suitable support. The main
insulator has the relatively large cavity a, extending inward from its
under surface, and from the inner C is a supplemental or auxiliary insulating sleeve or device. It preferably is made flaring or bell-shaped and of glass or other suitable insulating material. It has the central hole c to freely receive the pin B. Its lower edge c' rests upon the pin support b' and its upper part C2 is of a size to enter the |
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recess a' of the main insulator and permit the shoulder
a' thereof to come in contact with its upper end c3 and bear upon the
same, to firmly clamp it against the pin support. In
use, the inner section C is slipped upon the pin B and the main section
screwed down upon the pin until it has partially covered the inner
section and its shoulder a' brought into contact with the upper surface
of the inner section with sufficient stress to rigidly clamp it against
the pin support. This construction practically covers the pin with
insulation and increases the efficiency of the insulator in that it
reduces the extent of loss from moisture. It will be observed that when
the two parts are together, the section a3 of the main insulator forms a
petticoat about the upper portion of the lower section C, there
preferably being a cavity or space a4 between the petticoat and the
inner section. Having
thus fully described my invention, I claim and desire to secure by
Letters Patent of the United States-- 1.
In an insulator, the combination of the peg B having the threaded end
and its support, the main section A of an insulator having the thread to
engage the threaded end of the peg, and a supplemental insulating
section C clamped or held by the main section when screwed upon the peg
between it and the peg support, as and for the purposes described. 2.
In an insulator, the main section A, having the petticoat a3 and a
shoulder a' with the supplemental section C, a section of which enters
the recess formed by the petticoat and abuts against the shoulder a' and
the cavity a4, as and for the purposes described. 3.
The insulator, having the main section A, provided with a petticoat a3,
and the supplemental section C, a portion of which enters the cavity of
the main section formed by the petticoat a3 and the sides of which flare
outward below the cavity, substantially as described.
LAWRENCE B. GRAY. Witnesses: F.
F. RAYMOND, 2d, J. M. DOLAN. |