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To all whom it may concern: Be
it known that I, JOHN O'BRIEN,
a citizen of the United States, residing at New York, in the county and
State of New York, have invented new and useful Improvements in
Telegraph Insulators, of which the following is a specification. This
invention consists in a telegraph-insulator having within its body a
transverse hole extending in a straight line from side to side thereof,
and provided with a rectilinear side entrance approximately the length
of the transverse hole, and having its lower edge extended laterally in
an outward direction beyond the upper edge and terminating below the
latter to leave the rectilinear side entrance unobstructed for the
lateral insertion of the line wire. The
invention also consists in other features, which will be hereinafter
described and claimed. In
the accompanying drawings, Figure 1 represents a vertical central
section in the plane x x, Fig. 2. Fig. 2 is a face view. Fig. 3 is a
face view of two insulators secured on telegraph poles with the wire
extending through the insulators, on a smaller scale than the previous
figures. Similar
letters indicate corresponding parts. In the drawings, the letter A
designates a telegraph insulator, which is, by preference, made of
glass, but which may be made of any other material suitable for the
purpose. The
insulator shown in the drawings is provided with an internal screw
thread for the purpose of securing the same in position on a telegraph
pole; but my invention is not restricted to screw-insulators, since it
can be applied to insulators provided with other suitable means for
securing the same in position on a telegraph pole. In my insulator is formed a transverse hole, a, which forms a passage for the wire, and which extends in the line of the wire, and the wire is introduced into this hole through a side entrance, b, which is just wide enough to admit the wire. The sides of this side entrance are rectilinear and not winding or spiral, so that the wire can be readily passed through into the hole a. It will be seen from this description that the wire, when once introduced into the hole a, will be supported in an upward as well as in a downward direction, and at the same time no tie wires required, and the line wire can be drawn tight during the operation of putting it up with the greatest ease by a man standing on the ground and it can also be readily tightened up if ever it should be desirable. The lower edge or lip, c, of the side entrance, b, projects laterally in an outward direction beyond the upper lip, c’, and terminates below the latter, so |
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that it forms a guide to conduct the wire into the hole a. In
order to guard against the danger that the wire may be accidentally
forced out of the hole a through the side entrance, b, by gusts of wind
or other causes, the side entrance is made oblique in regard to the axis
of the hole, or to the direction in which the line-wire runs; and by
referring to Fig. 3 it will be readily seen that with an oblique side
entrance the wire is not liable to be thrown out of the bole a by the
strongest wind or otherwise. At
the same time the wire can he introduced through the oblique side
entrance lust as easily as it can through a side entrance parallel with
the axis of the hole a. I
am aware that an insulator has been formed with a V-shaped groove in one
side to receive the wire; also, that the upper end of an insulator has
been formed with an open top slot having at its bottom lateral incisions
for receiving the wire; and, also, that an insulator has been formed
with an annular groove and projecting ears arranged above and below the
groove for receiving the wire. Such,
therefore, I do not claim. What
I claim as new, and desire to secure by Letters Patent, is-- 1.
A telegraph insulator constructed within its body with a transverse
hole, a, extending in a straight line from side to side thereof and
provided with rectilinear entrance b, approximately the length of the
transverse hole, and having its lower edge, c, extended laterally in an
outward direction beyond the upper edge, c', and terminating below said
upper edge, c’, to leave the rectilinear side entrance unobstructed
for the free lateral insertion of the line-wire, substantially as described. 2.
A telegraph-insulator having constructed within its body a transverse
hole, a, extending from side to side thereof, and provided with a
rectilinear side entrance, b, arranged in a line oblique to the
longitudinal axis of the insulator, said side entrance extending
approximately the length of the transverse hole and having its lower
edge, c, projecting laterally in an outward direction beyond, but
terminating below, the upper edge, c', to leave the oblique side
entrance unobstructed for the lateral insertion of the wire,
substantially as described. In testimony whereof I have hereunto set my hand and seal
in the presence of two subscribing witnesses.
JOHN O’BRIEN. [L.S.] Witnesses: W.
HAUFF, E. F. KASTENHUBER. |