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To all whom it may concern: Be
it known that I, GEORGE W. BLACKBURN,
a citizen of the United States, residing at Palmyra, in the county of
Burlington and State of New Jersey, have invented certain new and useful
Improvements in Insulators for Electric Conductors; and I do hereby
declare the following to be a sufficiently full, clear, and exact
description thereof as to enable others skilled in the art to make and
use the said invention. This
invention relates to insulators for electric conductors, and is
specially applicable to telephone and telegraph lines although it may be
used for electric conducting lines for illuminating and dynamic service,
and has for its objects, the more secure holding of the wires, the
avoidance of injury to the wire, so that the same wires may be
repeatedly re-erected without impairment of strength or conducting
capacity, and by substituting the production of the fastening devices by
machinery, operated by power with certainty and celerity, for the
present modes of making such fastenings, by the manual operation of
tying wires at the place of erection, greater certainty of secure and
sound fastening lb attainable. The
nature of this invention consists in a block of insulating material
having a shoulder formed in it upon which the wire rests, in combination
with a clamping jaw or bail operated by a lever, having a fulcrum in the
insulated block, which lever securely locks the wire, in a depression
formed in the shoulder of the insulating block, so as to hold it
laterally, and at the same time makes a sufficient flexure of the wire
upon the ends of the shoulder, so as to hold it lengthwise without
injuriously diminishing the cross section of the wire at the points of
flexure. The
construction of the invention is shown in the accompanying drawings, in
which- Figure
1 shows a side elevation. Fig. 2 shows a front elevation; Fig. 3 a
vertical section in the plane indicated by the dotted line x x in
Fig. 1, and Fig. 4 a vertical section in the plane indicated by the
dotted line y y in Fig. 2. 1 represents a block of non-conducting material which may be either of glass, earthenware, india rubber or wood saturated with resinous matter. In the block 1 is formed a notch 2; in the back part of the notch 2 is a groove 3 into which the straight part of the jaw 5 fits. In front of and parallel with the groove 3 is a second groove 4 in which the line wire or conductor 6 fits. The sides 7 of the jaw 5 are bent forwardly and upwardly from the straight part of the jaws and thence downwardly in the parts marked B, and are recurved at the lower ends, so as to form pivots 9, engaging in eyes 10, in the lever bail 11. The |
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lever
bail 11 has the upper ends 12 bent inwardly so as to form pivots which
enter holes 13 in the block 1 forming fulcra for the lever bail 11. The
proportions and form of the lever bail 11 are such that when depressed
the eyes 10 carrying in them the pivot 9 of the jaw 5 are pressed hack
of the line of greatest depression, and the wires of which the jaw 5
and lever 12 are formed react elastically and hold the lever 12 in close
position against the face of the block 1. The form of the groove 3 and
the parts 7 of the jaw wire 5 is such, that the line wire 6 is bent
downward by the parts 7 of the jaw 5, over the end of the groove 3 and
under the part 7, thus preventing any endwise motion of the line wire 6,
and the straight part of the jaw 5 prevents the wire 6 from moving
backwardly, and is prevented from moving forwardly by the parts 8 of the
jaw 5 the
clamping of the line wire 6 is effected by simply placing it in the
groove 4 and depressing the lever 11 until the lever loop end of it is
in contact with the face of the block 1.
the wire 6 can be released by simply raising the lever 11. A
hood 14 as indicated in dotted lines in Figs. 1 and 2 may be formed with
block 1 to protect the part of the insulating block 1 contiguous to the
wire 6, from water, snow or Ice. The
facility of fastening and releasing wires by this device, in situations
in which the manipulation with tools often involves risk of falling and
personal injury renders this device safely useful and economical as
saving time in erecting, and the facilities with which the clamps can be
produced by automatic machinery renders their inexpensive in production. Having
described my invention, what I claim is--
1.
In an insulator for electric conductors, a bail shaped damping lever, a
block of insulating material having a right lined groove therein adapted
to receive a conducting line wire and aperture adapted to receive the
pivotal ends of said bail shaped lever, in combination with a single
clamp adapted to hook over the conductor on each side of the block and
provided with pivotal ends engaged in eyes in said clamping levers,
constructed and arranged to operate substantially as shown and
described. 2.
In an insulator for electric conductors, a bail shaped damping lever, a
block of insulating material having a right lined groove therein adapted
to receive a line conductor, and a second groove parallel thereto
adapted to receive a part of a damping jaw, in combination with a
damping jaw extending across said block in said groove, hooked over the
line conductor on each side of said block, and pivotally attached to
eyes in said bail shaped lever as described and shown.
GEORGE W. BLACKBURN. Witnesses: J.
DANIEL EBY, A. V. W. BUDD. |