No. 726,846. Patented May 5, 1903
UNITED STATES PATENT OFFICE
JOSEPH R. BELL, OF PECKVILLE, PENNSYLVANIA.
INSULATOR FOR ELECTRIC WIRES.
SPECIFICATION forming part of Letters Patent No. 726,846, dated dated May 5, 1903.
Application filed June 28, 1902, Serial No. 113,683. (No Model.)
To all whom it may concern:
it known that I, JOSEPH R. BELL,
a citizen of the United States, residing at Peckville, in the county of
Lackawanna and State of Pennsylvania, have invented certain new and
useful Improvements in Insulators for Electric Wires, of which the
following is a specification.
invention relates to insulators such as are used for stringing telegraph
and telephone wires to poles, and has for its objects to obviate the
necessity of tying wire, to provide a more secure and perfect attachment
of the wires to the insulator, to simplify and facilitate the attachment
to the insulator, to prevent the relaxation of wires by the process of
fastening, to take up the slack in the wires, and other objects, as are
herein specified, and more particularly pointed out in the claims.
these ends the invention consists of the construction, arrangement, and
combination of parts, as herein set forth, and shown in the drawings, in
1 is a side elevation of an exterior view of one of insulators with a
wire attached, parts being broken away to more fully show the position
of the wire. Fig. 2 is a
view in cross-Section, taken on the line x x of Fig: I, the wire
being removed. Fig. 3 is a
side elevation of the body portion of one of my insulators, taken at
right angles to that of Fig. 1. Fig.
4 is a view, partially in cross-section, taken on the line y y of
characters of reference denote like and corresponding parts throughout
the several views.
the drawings, 1 denotes the lower or body portion of one of my
insulators, and 2 denotes an upper or cap piece which is designed to be
secured to the said body portion by means of the screw-threaded shank 3.
The body portion is also provided with screw threads 4, by means of
which it is adapted to be secured to a wooden peg in the usual manner.
screw-threaded shank 3 is divided into lugs 4 and 5 by means of a deep
channel carrying the wire 6. The
said channel has converging sides 7 and 8, one of said sides being provided
with a central fret 9 and the other side being provided with frets 10
and 11, by means of which the wire to be secured is kinked at its
contacts with the said three frets, and it is arranged to be pressed
down into bending contact with the said frets by means of the rim or
petticoat 12 of the cap aforesaid.
A recess 14 is provided at opposite ends of the channel for the
wire 6, and when the cap is screwed down to its place the rim or
petticoat 12 compresses the wire 6 into said recesses 14 at opposite
sides, thus kinking the wire at 13 13, and thereby assisting to hold it
secure in its position. The
main or body portion of the insulator is provided with the usual
petticoat 15 and is provided with a tying-wire groove 16 to attach
tapping-lines or branch lines by means of tying-wire and also for an
emergency in case the cap or other parts of the insulator should become
broken. The cap has a
similar groove 17.
attaching a wire to the insulator the wire to be attached is drawn in a
taut position in the vicinity of the insulator and in this position is
laid into the channel provided for it.
The cap is then inserted and screwed downward and by means of the
impinging rim 12 on the wire forces it downward, so that the frets 9,
10, and 11 aforesaid indent the wire with lateral bends.
When the wire is taut, these bends will have a tendency to
increase the tension upon it, and the cap 2 is held secure from turning
by reason of the upward tension of the strained wire on the rim 12
aforesaid. Where the wire
is sufficiently taut, very little bending will take place in the
vicinity of 13 13; but should the wire become somewhat loosened
additional screwing down of the cap 2 will take up the slack by causing
the bends 13 13, as before mentioned.
thus described my invention, what I claim, and desire to secure by
Letters Patent, is--
The herein-described insulator consisting of a body portion, a
screw-threaded shank, a channel through said shank, the sides of said
channel converging downward, and the said converging sides having frets
thereon arranged to engage the wire when compressed within said channel,
together with a cap arranged to be screwed onto said shank, and to
compress the wire within said channel, substantially as and for the
In an insulator of the kind described, a body portion adapted to
be secured to a peg, the upper end thereof terminating in a
holding-shank, the said shank having a channel with converging sides,
frets on the sides of said channel arranged in alternate positions for
the purpose of kinking the wire to be held therein, substantially as and
for the purpose specified.
An insulator comprised in a body portion having a channel with
converging sides arranged to receive the wire to be insulated, the
converging sides of said channel having frets running in the direction
of the convergence and arranged in alternate positions, a cap arranged
to be secured over said body portion, the edges of the cap extending
over the openings of the channel aforesaid, whereby the wire inserted in
said channel is compressed into a tortuous shape, substantially as
An insulator of the kind described comprised in a main or body
portion substantially cylindrical in form having an internally
screw-threaded recess in one end thereof, and a channeled shank at the
opposite end thereof, the sides of said channel in said shank
converging, frets on the sides of said channel arranged in alternate
positions, screw-threads on the exterior of said shank, and a cap having
interior screw-threads arranged to engage with the shank aforesaid and
adapted when screwed on to compress the wire.
testimony whereof I affix my signature in presence of two witnesses.
JOSEPH R. BELL.