Year: 1885

page_text: We, SAMUEL SHARROCK of 8 Old Jewry in the City of London, and FRANCIS
GILBERT SHARROCK of Garston, Liverpool in the County of Lancaster Engineers
do hereby declare the nature of this invention to be as follows:-
This Invention relates to improvements on telegraph posts such as are described
in the specification of a patent granted to Samuel Sharrock N° 2089 in the
year 1871.
It has been found in practice that when the base base or sole plate is made
entirely of cast iron that the breakage during transport and otherwise is con-
siderable; we avoid this and also lighten the structure by making the sole plate
or base disc from a dished plate of steel or wrought iron having a hole in the centre
and upon this plate in the central hole we cast an iron boss with a coarse screw
thread within it and into this the foot or ground piece of the post screws.
The upper part of the structure consists of a taper tube of sheet steel or wrought
iron made in lengths and in each length the rivetted joint in place of being straight
as heretofore is made to pass helically. around the tube. Thus the strength is
equalised all round and in manufacture it is found easier to make the tubes
straight than it is at present as the hammering in closing the rivets is no longer
all on one side.
The lower part of each length is as heretofore strengthened with a broad hoop
or apron applied around it and the joint in this hoop or apron is also oblique to
admit of its fitting accurately to the joint of the tube.
CARPMAEL & Co.,
Agents for the Applicants.

page_text: We SAMUEL SHARROCK of 8 Old Jewry in the City of London and FRANCIS
GILBERT SHARROCK of Garston Liverpool in the County of Lancaster Engineers
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:-
This Invention relates to improvements on telegraph posts such as are described
in the Specification of a patent granted to. Samuel Sharrock N° 2089 in the
year 1871.
It has been found in practice that when the base disc or sole plate is made
entirely of cast iron that the breakage during transport and otherwise is con-
siderable; we avoid this and also lighten the structure by making the sole plate
or base disc from a dished plate of steel or wrought iron having a hole in the centre
and upon this plate in the central hole we cast an iron boss with a coarse screw
thread within it and into this the foot or ground piece of the post screws.
The upper part of the structure consists of a taper tube of sheet steel or wrought
iron made in lengths and in each length the rivetted joint in place of being straight
as heretofore is made to pass helically around the tube. Thus the strength is
equalised all round and in manufacture it is found easier to make the tubes
straight than it is at present as the hammering in closing the rivets is no longer
all on one side.
The lower part of each length is as heretofore strengthened with a broad hoop
or apron applied around it and the joint in this hoop of apron is also oblique to
admit of its fitting accurately to the joint of the tube.
In order that our said invention may be most fully understood and readily
carried into effect we will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS..
Figures, 1. 2. 3. 4 and 5 represent the foot or ground piece of a telegraph
post. The figures represent a range of sizes in which this portion is usually
inanufactured.
Figures 1A 2A 3A 4 and 5ª represent separately in plan the corresponding base
discs or sole plates. These are plates preferably of sheet steel about an eighth of
an inch thick. The plate has a hole formed in the centre and it is then dished by
pressure in dies to the figure shown by the drawings. This having been done a
central iron boss is cast upon it. The sectional form of the sole plate and boss is
shown by Figure 2. The boss is cast in a sand mould and the edges of the plate
with which the boss comes into contact are left somewhat ragged, so that there
may be no possibility of the boss turning in the hole in the plate. The plate need
not be square but the square form is convenient and is preferred. The ground
piece or foot is also of cast iron and it is hollow; at its lower end there is a coarse
screw thread corresponding to the screw thread within the base of the sole plate.
These screw threads are formed as is clearly shown in Figure 2 so that it takes
about a turn and a half of the foot to set it fast in its place in the sole plate or
base disc. In the side of the foot or ground piece just above the level of the soil
when the part is in place a vent is provided at a, it provides for the ventilation of
the interior of the hollow post.

page_text: Figures 6 to 18 show a variety of posts each with a foot or ground piece and
a base disc or sole plate such as we have described and with an upper part
composed of two or more standard sections. Each of these sections consists of a
taper tube preferably of sheet steel and varying in section according to the size
and strength required between say N° 14 Birmingham wire gauge and N° 6 of the
same gauge. These sections differ from those heretofore made in that the joint at
the side of the tube does not run parallel with the axis but passes spirally around
the tube. The edges of the sheet metal overlap and are connected by rivets. In
consequence of this spiral arrangement of the joint some of the hammering requisite
to close the rivets falls on every side of the taper tube and so there is no difficulty
in keeping the tube straight, which is difficult when all the rivets are on one side as
the hammering tends to expand the metal on this side and so to produce a
curvature of the tube. Greater uniformity in strength is also obtained. At the
lower end of each tube there is a broad hoop or apron, it is made generally from
the same guage of metal as the tube and this also has a joint formed obliquely and
the rivets spirally arranged. This is done in order that the joint of the apron may
correspond with the joint of the tube on which it is required to fit." As the
drawing indicates, when the hoop or apron is thus made its inner edge will abut
against the outer edge of the sheet forming the tube to which the hoop or apron
is thus made. Similarly when one section is applied on another the inner edge of
the sheet in the upper section will abut against the outer edge of the sheet in the
section below. The whole constitutes a telegraph post, which is very convenient
for transport from place to place. The sections are then packed one within the
other-section A being capable of fitting within section B and section B within
section C and so on. For transport by sea the sections are thus packed together
to form packages of a weight just sufficient for the freight to be charged upon them
by weight rather than by measurement. This has been found by experience to be
the method of package both for the merchant and ship owner.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:—
1. The sole plate or base disc consisting of a dished plate of steel or wrought iron
with a hole in the centre and a boss with a coarse screw thread cast upon the plate
within the hole.
2. The sections forming the upper part of the structure each with a taper tube
of sheet steel or wrought iron with a rivetted joint passing helically around the
tube.
3. The sections forming the upper part of the structure and consisting each of a
taper tube of sheet steel or wrought iron with a rivetted joint passing helically
around the tube and with an obliquely jointed broad hoop or apron applied around
the tube at the end where it passes on to the extremity of the next section.
4. Our improved telegraph posts substantially as described and represented by
the annexed drawings.