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To all whom it may concern: Be
it known that I, WILLIAM H. WRIGHT,
of Rochester, in the county of Monroe and State
of New York, have invented certain new and useful Improvements on
Telegraph-Wire Insulators; and I do hereby declare that the following
description of my said invention, taken in connection with the
accompanying sheet of drawings, forms a full, clear, and exact
specification, which will enable others skilled in the art to which it
appertains to make and use the same. My
present invention has general reference to improvements in
telegraph-wire insulators; and it consists, essentially, in the novel
and peculiar combination of parts and details of construction, as
hereinafter first fully described, and then pointed out in the claim. In
the drawings already mentioned, which serve to illustrate my said
invention more fully, Figure 1 is a longitudinal sectional elevation
through an insulator constructed in accord with my invention.
Fig. 2 is a transverse sectional plan in line x r of Fig. 1. Like
parts are designated by corresponding letters of reference in both
figures. The
object of my invention is the production of a simple and efficient
telegraph-wire insulator. To attain this end I construct the same, A, of
the usual external contour--that is to say, with a neck or groove, a,
for the reception of the wire, and a downwardly extending apron, said
insulator being made of glass, molded and cast in the usual manner, and
provided internally with a screw-thread, E, by means of which it is
secured upon the peg or pin B. In glass insulators the apron forms the lower portion; but in those now in most extensive use said apron is of a larger internal diameter than the size of the peg. This construction, though desirable, is objectionable for the reason that the groove a is in a position so near to the lower portion of the screw-thread as to but imperfectly support the insulator upon the peg. |
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To
avoid this objection, and at the same time give additional support to
the insulator and retain the advantages of the apron, I provide my
insulator with a corrugated portion C, extending from the lower edge of
the insulator to within a short distance of the screw-threaded portion,
said corrugated part being arranged to fit the peg B with its points D
only. By thus giving to the or a portion of the interior of the
insulator the corrugated contour I derive the advantages that, first,
the bearing upon the peak is extended downwardly to the full depth of
the apron; second, that at the projecting points D lock upon the peg B
nearly as soon as the insulator is screwed upon the peg by the wood
swelling and entering the corrugated portion, while at the same time air
is admitted to the peg to prevent rotting of the wood. It
will therefore be readily seen that this corrugated portion of the
interior of my improved insulator performs a very important function and
this notwithstanding the fact that the cost of manufacture has not been
increased thereby in any way. Having
thus fully described my invention I claim as new and desire to secure to
me by Letters Patent of the United States-- As
an improved article of manufacture, a telegraph wire insulator having in
its interior a screw threaded portion substantially as described, and a
corrugated portion, C, as stated, the corrugations running vertically--
that is to say, in line with the center line of the threaded portion,
substantially as specified-- said insulator being adapted for application upon a
screw-threaded peg, B, having the enlarged portion D’, as and for the
object stated. In testimony that I claim the foregoing as my invention I
have hereto set my hand in the presence of two subscribing witnesses. WILLIAM
H. WRIGHT. Attest: FRITZ
VOGES, HENRY W. LEGG. |