UNITED STATES PATENT OFFICE
RICHARD H. STERLING, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO THE STANLEY ELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.
SPECIFICATION forming part of Letters Patent No. 664,301, dated December 18, 1900.
Application filed March 14, 1900, Serial No. 8,604. (No Model.)
To all whom it may concern:
it known that I, RICHARD H. STERLING,
a citizen of the United States, residing at Pittsfield, Berkshire
county, Massachusetts, have invented certain new and useful Improvements
in Insulators, of which the following is a full, clear, and exact
invention relates to pole-line insulators or insulators for supporting
electrical conductors which are exposed to the weather, and has for its
object to produce a more efficient device and 6ne with which arcs are
not so liable to form as with those now in use.
invention is particularly useful where very high potentials are used, in
which case, particularly in wet weather, there is with the ordinary
insulator great danger of an arc forming around the insulator and
between the line and the supporting-pin.
This danger is largely due to the fact that in the ordinary
insulator the moisture or rain collects and falls in drops or small
streams, by which, as is well known, a much larger amount of electricity
is carried than would be by a single stream of a quantity equal to the
combined drops or streams. The
potential of the air around the pin is accordingly raised and as a
consequence arcing to the pin is facilitated. Moreover,
drops or small streams from an insulator when charged with electricity
are attracted toward the pin on which the insulator is supported and are
also easily blown toward it by the wind.
I have therefore made insulators with gutters which collect the
water and discharge it in large streams at definite points, and in order
to still further lessen the danger I preferably add spouts which shall
deliver the water at a greater distance from the supporting-pins.
following is a description of an insulator embodying my invention,
reference being had to the accompanying drawings, in which--
1 is a view partly in elevation and partly in section.
Fig. 2 is a plan view, and Fig. 3 is a front view of the upper
Referring more particularly to the drawings, A is a hat-shaped insulator, of porcelain or other suitable non-conducting material, mounted upon the pin B and consisting of a petticoat C and a top piece D, connected together by cement poured into grooves E. The top piece has a knob or crown F, with the I groove G,
which the conductor passes and in which it is secured.
About the edge of the part D is a gutter formed by the sloping
sides or rim and the flange H, in which the water collects and from
which it flows through the opening I in line with the electric
conductor. The sloping
sides are substantially those of a cone having a base of any suitable
shape and so flattened that the pitch of the surface down which the
water flows is not too steep. In
my preferred form the cone is flattened, so as to make the radius of its
circular base greater than its height. In order to carry the discharge
still farther from the pin, I provide a spout J.
There would be some disadvantage mechanically, both in the
manufacture of the insulator and in transporting and shipping the same,
in having a spout always projecting at right angles to the gutter.
I therefore make the spout separate end attachable, forming a
groove K therein, in which fits a corresponding portion of the
gutter-flange at the opening I, as shown. The
two parts can then be shipped separately, the spouts being attached when
desired, a waterproof cement being used to make a tight joint.
will be seen that with insulators embodying my invention the water is
not permitted to drop or run off at many points, but is collected and
discharged at definite points, so as to interfere with the insulating
function as little as possible.
I claim is--
An insulator having an upper surface in the form of a flattened cone and
a substantially vertical flange about its edge forming a gutter for
collecting and discharging the Water from said surface.
An insulator having an upwardly-projecting flange about its edge forming
a gutter and means for discharging collected water said means extending
a distance from said flange.
An insulator having on its upper surface at its edge a gutter and a
detachable spout leading from said gutter, substantially as described.
Signed March 10, 1900.
JOHN F. KELLY.