Insulators for Telegraphs.
Year: 1886

page_text: Insulators for Telegraphs.
I JOHN EDWARDS GRIFFITH of Vronheulog Villa Upper Bangor in the county
of Carnarvon Gentleman do hereby declare the nature of my invention for
IMPROVEMENTS IN CONSTRUCTIONS, FIXING AND FITTING ELECTRICAL INSULATORS
FOR TELEGRAPHS, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
In order that the nature of my said invention and the mode and means
of carrying the same into practice may be fully understood I refer to the
accompanying drawings.
Figure 1, represents my improved insulator in elevation, and Figure 2 in
vertical section showing the two separate parts brought together by means of the
supporting bolt C, having been screwed home as shown by E and D.
Figure 3 represents the part.A of the insulator separate from the inner chamber
or shade B in vertical section.
Figure 3 represents the inner chamber or shade B in vertical section on the
supporting bolt C. Figure 3b horizontal section of the same. Figure 4 represents
the insulator in elevation with the metalic cap J. Figure 5 vertical section of the
same and Figure 6 horizontal section showing nut D. in position.
The same letters of reference indicate the same parts in Figures 1. 2. 3. 3* 3b
4. 5. 6.
Instead of having the screw hole made in the porclain at the axis of the insulator
to receive the supporting bolt C as the one in use now by the Postal Telegraph,
I have an iron screw nut marked D. in Figures 2. 3 & 5 vertical section and D in
horizontal section Fig. 6: of octagonal or any other external shape, about 1 inches
in thickness, more or less and 1 inches in diameter more or less. This nut is
fastened in the axis of the said insulator near the top, with sulphur, plaster paris
or any other cement.
The screw thread in the said nut will not chip off as the porclain thread that is
now in use, and it will keep the said insulator much firmer and stronger in its
place on the supporting bolt C, it will also keep from rusting being protected from
damp by means of the india rubber washer G hereafter mentioned. The insulator
can be easly unscrewed when required to be cleaned or repaired.

page_text: The said insulator is composed of two separate parts as shown by Figure 3
and 3ª vertical section and 3b horizontal section, A being one part and B the other
part. These separate parts have one, two, or more chambers or shades in each,
these are screwed together as herein described by means of the supporting bolt C.
On the bolt C I have a flange or collar about 1 inches more or less from the
top. Upon this flange or collar I place a washer of india rubber, leather, or any
other yielding substance, as shown by F in Figures 2, 3 & 5 then I put the bolt
through the hole marked C in horizontal section of the said chamber or shade B,
with another india rubber washer thereon as shown by G in Figures 2. 3ª and 5,
then I screw home the bolt C into the said nut D. so as to bring the two separate
parts A and B together by doing so the said washer G. will be made to expand in
chamber H Figure 2 & 5 so as to prevent any electric current that may run over
the surface of the insulator (when moistened by mists, dews, fogs or rain) reaching
the supporting bolt C. at H without returning along the sides of the said inner
chamber or shade B to the point marked FA.
It will be seen by applying this inner chamber or shade B that the insulating
surface will be increased nearly double the distance between the current wire and
the bolt C to what it is, on the present insulators in use. I propose if necessary
to have one or two, more or less small holes at the bottom of the said inner
chamber or shade B at I so as to drain off the moisture that may accumulate
therein.
I propose when preferred to add a form of metalic cap to go over the said
insulator to preserve it from being broken by stone throwing &c For this purpose
I make a little alteration on the external form of the said insulator Figure 1 but
the internal arrangements are to be the same, the cap can be made of malable iron
or any other metal, and has two slits with holes at the top so as to slip over the
said insulator and current wire as shown by Figures 4 & 6.
At the upper end of the cap J I have a flange fitting a plug on the top of the
insulator, this plug is furnished with a collar and screw thread outside marked M.
Figure 5 made of iron or any other metal, fastened with sulphur, plaster paris or
any other cement. The said screw thread can be made on the porclain plug itself
if preferred. Then I have a covered iron nut marked L Figure 5 with a flange to
screw on this plug so that when it is screwed home the flange will come over the
flange K of the cap so as to prevent any wet running in between them as shown
by Figure 5 vertical section. This cap will also act as guard for the current wire
and will keep the insulator clean.
Having now fully described the nature of my said invention and in what
manner the same is to be carried out I declare that what I claim as my invention
is the following:-
1st The mode of fixing the insulator on the supporting bolt C with the iron
screw nut as described herein.
2nd The inner shade or chamber B and mode of fixing the same.
3rd The metalic cap or filling J. with slits and holes for covering the insulators
and mode of fixing the same.
4th Increasing the length of the insulating surface by means of the inner
chamber or shade B.
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