IM- PROVEMENTS IN PUMPS
Year: 1874

page_text: LETTERS PATENT to James Broadfoot, of Glasgow, in the County
of Lanark, North Britain, Engineer, for the Invention of "IM-
PROVEMENTS IN PUMPS."
Sealed the 10th July 1874, and dated the 19th January 1874.
PROVISIONAL SPECIFICATION left by the said James Broadfoot at the
Office of the Commissioners of Patents, with his Petition, on the
19th January 1874.
I, JAMES BROADFOOT, of Glasgow, in the County of Lanark, North
Britain, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN PUMPS," to be as follows, that is to say :-
This Invention relates to pumps of the kind in which three pistons or
buckets work in one barrel or cylinder, and consists in combining the
three piston rods with the cranks in an improved manner.
In carrying out the Invention each piston rod has formed on it or
attached to it a cross head frame made with a rectangular slot or opening,
the bottom and top edges of which slot serve as guides to a bush adapted

page_text: to one of the three cranks. Each crank bush is made in two halves,
which can be put in place and screwed together after the cross head
frame is put over the cranks, and flanges are formed on the edges of the
bush to embrace the edges of the frame and prevent displacement. Each
bush is provided with a circle of antifriction rollers and these rollers are
kept in their proper relative positions by rings at the sides, these
rings being cut into halves to admit of their being got into their
places.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Broadfoot in the Great Seal Patent Office,
on the 17th July 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
BROADFOOT, of Glasgow, in the County of Lanark, North Britain,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Nineteenth day of January, in the
year of our Lord One thousand eight hundred and seventy-four, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said James Broadfoot, Her special
licence that I, the said James Broadfoot, my executors, administrators,
and assigns, or such others as I, the said James Broadfoot, 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 Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
PUMPS," upon the condition (amongst others) that I, the said James
Broadfoot, 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.

page_text: NOW KNOW YE, that I, the said James Broadfoot, 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 in writing, reference being had to the accompanying
Drawings, that is to say :-
My said Invention relates to pumps of the kind in which three pistons
or buckets work in one barrel or cylinder, and consists in combining the
three piston rods with the cranks in an improved manner.
And in order that my said Invention and the manner of performing
the same may be properly understood, I hereunto append a Sheet of
explanatory Drawings, to be herein-after referred to, and representing a
pump as made with my improvements. In these Drawings the same
reference numerals are used to mark the same or like parts wherever
they are repeated.
Figures 1 and 2 of the Drawings are vertical sections of the pump as
at right angles to each other; and Figures 3,.4, 5, are enlarged views of
the parts to which my Invention more especially relates.
The pump barrel 1 is made with an enlarged upper body 2, as usual
with this class of pump, and in this upper body 2 there are fitted
bearings for a horizontal crank shaft 3, which has fixed on it externally
the usual fly wheel 4 and crank handles 5. The pistons or buckets
which are not shown are of the usual construction. Each of the three
piston rods 6, 7, 8, has formed on it or attached to it a cross head
frame 9, 10, 11, and each frame is made with a rectangular slot or
opening, the top and bottom edges of which are horizontal, and are
acted on by a bush 12, 13, adapted to one of three cranks 14, 15, 16,
formed on the horizontal shaft 3. Each crank bush is made in two halves
12, 13, one of which is shown separately in edge view in in Figure 3,
and a pair of which are shown in section in Figure 4, and in face view in
Figure 5. Each half bush 12, 13, is shaped so that it can be got into its
place after the cross head frame 9, 10, or 11, is put over the cranks, and
the two half bushes can then be fixed together by means of the counter-
sunk screws 17. Flanges are formed on the edges of the bush 12, 13,
to embrace the guide edges of the cross head frame opening, whilst the
cheeks 18 of the cranks are made as large as conveniently possible to
prevent displacement of the bushes when partly worn. The outer

page_text: vertical edges of the cross head frames 9, 10, 11, are fitted to work in
guide grooves formed for them in the upper body 2. Each crank
bush 12, 13, is provided with a circle of antrifriction rollers 19, and these
rollers are kept in their proper relative positions by rings 20 at the sides.
These rings 20 are made with holes, into which are entered small
journals formed on the ends of the rollers 19, and the rollers are thereby
held just clear of each other. The rings 20 are cut in halves to admit of
their being got into their places.
With the improved construction of bush herein-before described there
is a rolling action between the crank and the bush, and the friction and
wear is very much reduced, whilst there is much less noise than with
other arrangements.
Having thus particularly described my said Invention, and the
manner of performing the same, I have to state that I am aware that
the placing of rollers between a revolving crank or journal and its bush
or bearing is not new, but that what I believe to be novel and
original, and claim as the 'Invention secured to me by the herein-
before in part recited Letters Patent is, the adapting of antifriction
rollers to the cranks of three-piston pumps by making in halves the
rings and bushes holding tho rollers, and by combining the parts together
in the improved manner herein described and delineated.
In witness whereof, I, the said James Broadfoot, have hereunto
set my hand and seal, this Fifteenth day of July, in the year
of our Lord One thousand eight hundred and seventy-four.