IMPROVEMENTS IN THE MANU- FACTURE OF SUPPORTS FOR TELEGRAPH INSULATORS
Year: 1872

page_text: LETTERS PATENT to Lillias Jobson, of Dudley, in the County of
Worcester, Widow and Executrix of Robert Jobson, late of Dudley,
in the County of Worcester, deceased, for the Invention of "IM-
PROVISIONAL SPECIFICATION left by the said Robert Jobson, at the
Office of the Commissioners of Patents, with his Petition, on the
29th June 1872.
I, ROBERT JOBSON, of Dudley in the County of Worcester, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN THE MANU-
FACTURE OF SUPPORTS FOR TELEGRAPH INSULATORS," to be as follows:-
This Invention relates to supports of wrought or malleable iron
ordinarily used for carrying the insulators to which telegraph wires are
attached, and consists of improvements in the method of manufacturing
such supports, by which improvements considerable economy is effected
in their cost, and in the time required to make them, and in their
strength.

page_text: ?
Supports of the kind described for telegraphic insulators ordinarily
consist of a bar of wrought or malleable iron, to one end of which the
insulator is attached by cement or in any other suitable way. The lower
end of the bar is screwed and furnished with a nut, by means of which
it is attached to a wooden arm, or post, or other suitable bracket and
standard. At a sufficient distance from the nut described a collar is
formed upon the bar, which rests upon the wooden arm or other bracket
and standard, and is tightened against it by means of the nut. It is
necessary that the collar should be of considerable diameter in order to
prevent it from being drawn into the wooden arm or standard, and the
method in which it has been hitherto constructed has been by taking a
bar of iron a little larger in diameter than the part required to be
screwed, and forming the collar upon it at the place required by welding.
To do this a piece of iron of the size necessary for forming the collar is
bent round the bar, to which it is attached by forging at welding heat;
but by this method, if both the bar and collar piece be not at a perfectly
welding heat, the collar is liable to be pressed into the bar without being
properly united to it, and so reduce the strength by diminishing the
diameter of the bar at that part.
My improved method of manufacture consists in taking a bar only
slightly greater in diameter at the part where the collar is to be formed,
and forming upon it by either forging or turning or other suitable
method a shoulder, against which a suitable separate ring may be fitted,
such ring serving as a collar for the purpose described.
In order to fix such ring as described upon the bar I prefer to heat
the ring until it has sufficiently expanded, and then to place it in its
proper position upon the bar, so that its contraction as it becomes cold
may fix it firmly. The hole in the ring and the part of the bar upon
which it fits may be circular, square, polygonal, or of any other suitable
form, and the outside of the ring may be circular, or its sides may be
flattened or made polygonal, so that it may be held fast and be
prevented from turning round whilst the nut already described is being
screwed up or taken off.
Sometimes I dip the support with the ring attached as described into

page_text: Sometimes I make projections or roughnesses upon the lower side of
the ring, which are forced into the wooden arm or standard when the
nut is tightened.
The accompanying Drawing is in illustration of my Invention.
Figure 1 is an elevation partly in section of an insulator and support.
A is the bar having the shoulder B formed upon it at a suitable distance
from its ends; C is the part which passes through the wooden arm or
other bracket or standard to which it is fixed by the nut D. The other
end of the bar A is shewn tapering down from the shoulder B to the
insulator E which is attached to it. G is the ring fitting upon the
bar C and forming a collar, between which and the nut D the wooden
arm or other bracket or standard is screwed.
•
Figure 2 shows a plan of the ring or collar having two of its sides
flattened for the purpose described.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Lillias Jobson in the Great Seal Patent Office
on the 27th December 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, LILLIAS
JOBSON, of Dudley, in the County of Worcester, Widow and Executrix
of the late ROBERT JOBSON, of Dudley, in the County of Worcester,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-ninth day of June, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Lillias Jobson, Her special licence that I,
the said Lillias Jobson, my executors, administrators, and assigns, or such
others as I, the said Lillias Jobson, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United

page_text: Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for " IMPROVEMENTS IN THE MANUFACTURE OF SUPPORTS
FOR TELEGRAPH INSULATORS," upon the condition (amongst others) that I,
the said Lillias Jobson, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Lillias Jobson, do hereby declare the
nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement and accompanying Drawings (that is to say) :-
I
This Invention relates to supports of wrought or malleable iron
ordinarily used for carrying the insulators to which telegraph wires are 1
attached, and consists of improvements in the method of manufacturing
such supports, by which improvements considerable economy is effected
in their cost, and in the time required to make them, and their strength
is increased.
Supports of the kind described for telegraphic insulators ordinarily 2
consist of a bar of wrought or malleable iron, to one end of which the
insulator is attached by cement or in any other suitable way. The lower
end of the bar is screwed and furnished with a nut, by means of which
it is attached to a wooden arm, or post, or other suitable bracket and.
standard. At a sufficient distance from the nut described a 'collar is 2
formed upon the bar which rests upon the wooden arm or other bracket
and standard, and is tightened against it by means of the nut. It is
necessary that the collar should be of considerable diameter in order to
prevent it from being drawn into the wooden arm or standard, and the
method in which it has hitherto been constructed has been by taking a 3
bar of iron and forming the collar upon it at the place required by
welding. To do this a piece of iron of the size necessary for forming the
collar is bent round the bar to which it is attached by forging at
welding heat; but by this method if both the bar and collar piece be
not at a perfectly welding heat the collar is liable to be pressed into the 3.
bar without being properly united to it, and so reduce the strength by

page_text: diminishing the diameter of the bar at that part. The iron is also liable
to be burnt by overheating.
The improved method of manufacture consists in taking a piece of bar
iron of suitable length and reducing it from one end so as to leave a
shoulder at the point where the collar is to be fixed. A separate collar
is then taken and when it is heated it is driven on to the bar up to the
shoulder which has been formed upon it.
Figure 1 is an elevation of a support for a telegraph insulator con-
structed according to this Invention, together with the insulator and the
nut by which the support is fixed in its place.
Figure 2 is an elevation partly in section of the support.
a is the
support with its collar a¹ and a screw thread cut upon it at a³; b is the
insulator cemented on to the notched or flattened end on top of the
support; c is the screw nut for clamping the support upon the arm or
bracket upon which it is carried.
Figure 3 is a side view of a support of a slightly different form, but
constructed in the same manner.
In the course of manufacture it is preferred to proceed as follows:-
A piece of round bar iron is cut off to the length to form the support; it
is chucked in a lathe and turned down from one end up to the
shoulder a against which the collar is to rest. The collar which is
usually square or flattened on opposite sides to receive a spanner is made
separately of iron of very good quality, and the hole in it is made slightly
smaller in diameter than the dimensions to which the spindle has been
reduced at the shoulder. The collar is then heated to a bright red heat
and is driven on to the bar, the latter being cold.
As the collar contracts in cooling it becomes very firmly fixed in its
place. The support is then by preference coated with zinc by the
galvanizing process, the screw thread is cut upon it, and it is then ready
to receive the insulator,

page_text: Having thus described the nature of the said Invention and the
manner of performing the same, I would have it understood that I claim
the manufacture of supports for telegraph insulators, substantially as
described.
In witness whereof, I, the said Lillias Jobson, have hereunto set my 5
hand and seal, this Twenty-first day of December, in the year of
our Lord One thousand eight hundred and seventy-two.
LILLIAS JOBSON. (L.S.)