Improvements in the Manufacture of the Insulator Arms of Telegraph Poles and Poles for Carrying Conductors of Electricity generally.
Year: 1895

page_text: Date of Application, 13th June, 1895
Complete Specification Lett, 13th Feb., 1896-Accepted, 14th Mar., 1896
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of the Insulator Arms of
Telegraph Poles and Poles for Carrying Conductors of
Electricity generally.
We, BULLERS LIMITED, of Sherlock Street, Birmingham, in the County of
and EDWARD JOHN
Warwick, Telegraph Engineers and Manufacturers
CHAMBERS, of Castle Cottage, Dudley, in the County of Worcester, Civil
and Mechanical Engineer and Director of Bullers Limited, aforesaid, do hereby
declare the nature of this invention to be as follows:-
The insulator arms of telegraph poles are ordinarily made in one piece and of
oak and owing to the required length and strength of the said arms they are
costly. Instead of making the said arms of one piece of oak we make them
according to the said invention of two pieces combined in the manner hereinafter
explained. By the said invention pieces of oak of insufficient size to manufacture
the said arms in the ordinary way can be utilized and insulator arms of the
required size and equal or superior strength to ordinary insulator arms manufactured
therefrom.
In manufacturing an insulator arm according to the said invention we proceed
as follows. We take two pieces of oak of the usual size and figure in cross
section and having a combined length equal to or somewhat greater than the
length of the arm to be made. We will hereinafter call the said two pieces of
oak half arms. We connect and bind the said half arms together end to end and
in line by an iron or steel sleeve having the figure of a short rectangular open
jointed tube. The said sleeve surrounds the opposed ends of the half arms fitting
them closely and the said sleeve and half arms are connected together by means of
headed screw pins and screw nuts passed through the said sleeve and opposed ends
of the half arms. The ends of the half arms may either abut against each other
and be dowelled, mortised or tennoned together but we prefer to connect the ends
of the half arms by means of a scarf joint, through the two parts of which the
horizontal screw pin by which the arm is connected to the pole passes. The exact
length of the half arms employed depends upon the kind of joint by which the
half arms are connected together. Where the ends of the half arms simply abut
against one another their combined length is exactly that of the arm to be made.
In consequence of the open joint of the tubular sleeve the said sleeve is capable of
a limited amount of contraction and by means of the headed screw pins and
In
nuts can be tightened with any degree of tightness upon the half arms.
order to prevent corrosion we galvanize the sleeve and the headed screw pins and
outs.
Insulator arms made according to the said
arms of the ordinary manufacture.
Dated this Thirteenth day of June 1895.
invention are stronger than insulator
W. T. WHITEMAN,
Agent for the Applicants.

page_text: 101.
Improvements in the Manufacture of the Insulator Arms of
Telegraph Poles and Poles for Carrying Conductors of
Electricity generally.
We BULLERS LIMITED, of Sherlock Street, Birmingham in the County of
Warwick, Telegraph Engineers _ and Manufacturers, and EDWARD JOHN
CHAMBERS, of Castle Cottage, Dudley, in the County of Worcester, Civil
and Mechanical Engineer and Director of Bullers Limited aforesaid, do hereby
declare the nature of the said invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement :--
The insulator arms of telegraph poles are ordinarily made in one piece and of
oak and owing to the required length and strength of the said arms they are
costly and difficult to obtain. Instead of making the said arms of one piece
of oak or other hard wood we make them according to the said invention of two
pieces combined in the manner hereinafter explained.
In manufacturing an insulator arm according to the said invention we proceed
as follows.
We take two pieces of oak or other hard wood of about the usual
size and figure in cross section and having a combined length equal to or somewhat
greater than the length of the arm to be made. We will hereinafter call the said
two pieces of oak half arms. We connect and bind the said half arms together
end to end and in line by an iron or steel sleeve having the figure of a short
rectangular open jointed tube. The said sleeve surrounds the opposed ends of the
half arms fitting them closely and the said sleeve and half arms are connected
together by means of headed screw pins and screw nuts passed through the said
sleeve and opposed ends of the half arms. The ends of the half arms may either
abut against each other and be dowelled mortised or tenoned together but we
prefer to connect the ends of the half arms by means of a scarf joint through the
two parts of which the horizontal screw pin by which the arm is connected to the
pole passes. The exact length of the half arms employed depends upon the kind
of joint by which the half arms are connected together. Where the ends of the
half arms simply abut against one another their combined length is exactly that of
the arm to be made. In consequence of the open joint of the tubular sleeve the
said sleeve is capable of a limited amount of contraction and by means of the
headed screw pins and nuts can be tightened with any degree of tightness upon
the half arms. In order to prevent corrosion we galvanize or otherwise coat the
sleeve and the headed screw pins and nuts.
Insulator arms made according to the said invention are much stronger thau
insulator arms of the ordinary manufacture.
Figure 1 of the accompanying drawing represents in front elevation; Figure 2.
in side elevation (partly in section) and Figure 3 in plan a part of a telegraph pole
to which is attached an insulator arm made according to the said invention;
Figure 4 represents in plan the two half arms of the insulator arm in position
without the connecting and binding sleeve and
Figure 5 represents the iron or steel sleeve in plan of underside drawn to a
larger scale than the other figures of the drawing.
The same letters of reference indicate the same parts in the several figures of
the drawing.
In manufacturing an insulator arm of the kind represented, we take two pieces
of oak, or other hard wood, marked respectively a, a' each of a length somewhat
greater than one half the length of the arm to be made and of a figure in cross
section similar to that of ordinary insulator arms. We shape the ends of the two

page_text: half arms to be connected together so as to form a scarf joint preferably of the
kind represented in the plan Figure 4, and when the two half arms are in this
position we pass over the joined ends an open jointed iron or steel tube or sleeve b
of the kind represented detached in Figure 5 and thereby form an insulator arm of
the size required. The said tube or sleeve 6 has a size and figure in cross section.
suitable to fit the middle of the combined half arms. The sleeve b is fixed in place
and made to bind the two half arms together by two vertical screw bolts c, c
passing through holes b', 6' in the opposite sides of the sleeve band through holes
in the half arms, the open joint of the sleeve permitting of a limited amount of
contraction of the said sleeve upon the half arms. The sleeve b of the arm fits
in the cut away part of the telegraph pole e and is connected thereto by the
horizontal bolt d in the ordinary way, the said bolt passing through holes in the
front and back of the sleeve b and through a hole in the scarf joint of the combined.
half arms.
In the
Although we prefer to shape the two ends of the half arms to be joined as
represented in Figure 4, yet we wish it to be understood that the said ends may be
otherwise shaped or may be square and simply abut against each other.
latter case the half arms have a combined length equal to the insulator arm to be
made. Or the ends of the half arms may be joined by dowelling, mortising or
tenoning them together. And although we prefer to form the sleeve of an open
jointed tube yet the said sleeve may be made of a closed tube and be connected to
the half arms by shrinking.
By manufacturing insulator arms in the manner hereinbefore described and
represented, pieces of oak or other hard wood of insufficient length to manufacture
the said arms in the ordinary way may be utilized and insulator arms of the
required size and of superior strength to ordinary insulator arms manufactured
therefrom.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that we claim as.
our invention of "Improvements in the manufacture of the insulator arms of
telegraph poles and poles for carrying conductors of electricity generally
"
;-
Manufacturing insulator arms each from two pieces or half arms of oak or other
hard wood of a combined length equal to or somewhat greater than the insulator
arm to be made, the said half arms being connected and bound together by a
tubular sleeve of iron or steel situated on the middle portion of the insulator
arm substantially as hereinbefore described and illustrated in the accompanying
drawing.
Dated the Tenth day of February 1896.
BULLERS LIMITED,
By T. H. SIMMONDS, Secretary.
EDWARD JOHN CHAMBERS.