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To all whom it may concern: Be
it known that I, HARRY H. COCHRANE,
a citizen of the United States, and a resident of Butte, in the county
of Silver Bow and State of Montana, have invented a new and Improved
Insulator, of which the following is a full, clear, and exact
description. My
invention relates to insulators and has reference more particularly to
insulators for electric currents of high potential. The
object of the invention is to provide a simple, strong, efficient and
durable insulator characterized by the provision of a central insulating
core of fibrous nature scaled in replaceable, protective, insulating
shells so that the core therein is protected from atmospheric influence. With
the above and other objects in view, the nature of which will more fully
appear as the description precedes, the invention consists in the novel
construction, combination and arrangement of parts as herein fully
described, illustrated and claimed. In
the accompanying drawings, forming part of the application, similar
characters of reference indicate corresponding parts in all the views. Figure 1 is a vertical central section through my insulator; Fig. 2 is a horizontal section on line 2-2, Fig 1; and Fig. 3 is a similar section on line 3-3, Fig. 1. Referring
to the drawings, 4 represents a fibrous rod, preferably of hickory. This
rod constitutes the core of the insulator. The
ends of the rod 4 are reduced and thereon are crimped metallic cups 5. The
cups have threaded portions 6, the diameter of which is substantially
the same as the diameter of the rod. The metallic cup 5 at one end of the core receives a metallic cap 14 which is threaded on to the cup 5 and the outer diameter of which cap 14 is substantially equal to the outer diameter of the tubular portion 10 of the shell, so that the same will fit loosely into the collar of a shell 9 placed on to the core to engage the cap. The shoulder 13 of each shell carries a gasket 15, preferably formed of an insulating material, such as paraffin, pitch or bitumen; which seals the contacting ends of the successive shell as well as the engaging end of the cap 14. The space between the cap 14 and the collar is closed by cement of insulating character, as is also the space between the successive |
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tubular
portions and the collars in engagement therewith, as shown in Fig. 1.
Secured to the cup 5 at the other end of the rod 4 is a cap 16
which has a central recess 17 of substantially the same diameter as the
inner diameter of the collars 12, so that the same will accommodate the
tubular portion 10 of the shell adjacent the said end where the cap 16
is provided. The clearance
in the recess is also cemented, so that the core is perfectly sealed
within the series of shells and the caps carried by the ends of the
core. Therefore, the same
is insulated from the atmosphere and, consequently will not be affected
by the changes thereof and will be immune from humidity, which is the
cause of many troubles in insulators for currents of high potential. The
caps 14 and 15 are each provided with a staple 18 whereby the entire
insulator can be supported and attached to carry the conductor.
The fibrous core is preferably impregnated with an insulating
compound, such as oil or paraffin.
The transverse resistance of such a core is very great, as the fibers are disposed longitudinally.
It is substantially inflexible, and, consequently, forms a rigid
unit on which the conductor can be flexibly supported, due to the
provision of the staples 18. The
shells and caps, as previously described, form the protector for the
core. Due to the fact that
the core is a rigid one, any of the broken shells 9 can be easily
substituted by removing a cap from the ends of the core, slipping off the
shells which are injured and replacing the injured shells, then
replacing the uninjured shells and tying them together as previously
described. While
I have described the principle of operation, together with the device
which I now consider to be the best embodiment thereof, I desire to have
it understood that the device shown is merely illustrative and that such
changes may be made are within the scope of the appended claims. I
claim: 1.
An insulator comprising an insulator rod, metallic cups crimped
to the ends of the rod, tubular insulating sections engaging the rod,
metallic caps in threaded engagement with the cups, insulating gaskets
intermediate the tubular sections, and means cementing the sections to
one another and to the caps, substantially as and for the purpose set
forth. 2.
In an insulator, a wooden rod impregnated with an insulating
compound and forming the core, tubular insulating sections fitting
snugly on to the rod, each of said sections having a petticoat and an
annular collar within the petticoat adapted to accommodate the end of
the succeeding section, an insulating gasket within the annular collar,
metallic caps in threaded engagement with the cups and in engagement
with the adjacent tubular sections, and means sealing the connection
between the engaging sections and the sections engaging the caps. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
HARRY HAMILTON
COCHRANE. Witnesses: C.
C. TILLOTSON, JACOB AUTHORIESON. |