Year: 1886

page_text: We, EDWARD TATE, of 16, Arlington Street, Islington, Engineer, and SYDNEY
SMIRKE, of 8, Craig's Court, Charing Cross, Architect, both in the County of
Middlesex, do hereby declare the nature of this invention to be as follows:-
Our invention relates to rotary pumps or motors of that class in which the rotary
piston is arranged excentrically of the cylinder enclosing the same, and is provided
with a series of plungers which are adapted to bear against the face of the cylinder
at all times during the rotation of the piston.
The chief objects of our present invention are to reduce the friction between the
said plungers and the surface of the cylinder, and to prevent the leakage around the
piston and plungers.
In carrying our said invention into practice we construct the plungers with
longitudinal dovetail grooves in their outer ends, into which grooves we fit strips of
metal of the same length as the piston. Each of these strips has formed in its outer
side adjacent to the surface of the cylinder, a groove into which is inserted a strip of
lignum-vitae, leather, or other suitable material which will rub with little friction upon
the surface of the cylinder. When these strips become worn they may be readily
removed, by withdrawing the metal strips from their dovetailed slots, and be replaced
by others.
In some cases the metal strips may be entirely dispensed with, and lignum-vitae or
other material inserted directly into the dovetail grooves in the plungers.
In order to press the plungers into contact with the surface of the cylinder without
too much friction, a passage is formed through each plunger between the water
space in the cylinder and the space at the rear of the plunger in the recess in which
it works. Water can thus get behind the plunger and press the same forward
into contact with the cylinder. Springs or other devices are thereby rendered
unnecessary.

page_text: To prevent the escape of water around the end of the piston I provide a disc which
accurately fits the interior of the cylinder and which on one side bears against the end
of the piston in close contact therewith. This contact is maintained by means of
springs placed between the said plate and the adjacent cylinder cover. For the
purpose of regulating the pressure between the said plate and the piston I provide
three or more set screws which are adapted to bear upon the said springs and compress
them more or less as required. A pin fixed to the plate enters a hole in the cylinder
cover and thereby prevents the said plate from turning.
1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Rotary Pumps or Motors.
We EDWARD TATE, of 16 Arlington Street, Islington, Engineer, and SYDNEY
SMIRKE, of 8 Craig's Court, Charing Cross, Architect, both in the County of Middlesex,
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 :-
Our invention relates to rotary pumps or motors of that class in which the rotary
piston is arranged excentrically of the cylinder enclosing the same, and is provided
with a series of sliding pieces, hereinafter termed plungers, which are adapted to bear
against the internal surfaces of the cylinder during the rotation of the piston.
The chief objects of our present invention are to reduce the friction between the
said plungers and the cylinder, and to prevent leakage around the piston and plungers.
In the accompanying drawing
Figure 1 is a front elevation of a rotary pump provided with our improvements, the
cover being removed; and
Figure 2 is a transverse section of the same on the line a, a, Figure 1.
Figure 3 is a front elevation of one of the plungers; and,
Figure 4 is a transverse section of the same on the line a¹, x, Figure 3.
Like letters of reference indicate corresponding parts throughout the drawing.
a is the cylinder or casing, provided with inlet and outlet openings a*, a*, and fitted
with covers a and a²; and bis the rotary piston secured to the driving shaft c
arranged excentrically of the cylinder or casing a, the said shaft being carried in
bearings in the covers a¹, a².
d are the plungers which are inserted in longitudinal grooves or recesses 6' formed
in the piston b.
These plungers d are composed of metal, and are preferably of the same length
as the rotary piston. In their outer sides, adjacent to the surface of the cylinder, are
formed grooves or recesses d¹, into which strips e of lignum-vitae, leather, or other
suitable material are introduced.
By the use of these strips e the friction between the ends of the plungers and the
surface of the cylinder. is reduced to a minimum; and, when the said strips become
worn, they may be readily removed, after withdrawing the plungers from their
recesses or slots, and be replaced by others.
The plungers d, instead of being made of metal and having strips of wood or other
substance located in grooves therein, may be entirely composed of lignum vitae or
other material inserted directly into the recesses b₁ in the rotary piston b. In this
case the strip e may be dispensed with.
In order to press the plungers into contact with the surface of the cylinder without
too much friction, a passage d' is formed in each plunger, which passage establishes
communication between the water space in the cylinder and the space at the rear of

page_text: the said plunger in the recess in which it works, as more clearly shown in dotted lines
in Figure 1. Water is thus allowed to pass behind the plungers d and press the same
forward into contact with the cylinder. Springs or other devices are thereby rendered
unnecessary. I also, preferably, form a recess d³ at the rear side of each plunger, as
shown in Figures 3 and 4 and in dotted lines in Figure 1. This arrangement tends
to prevent the plungers from becoming jammed in case sand, dirt or the like enters
the cylinder with the water or other liquid.
To prevent the escape of water around the end of the rotary piston I provide a disc f
of metal or other suitable material, which accurately fits the interior of the cylinder
and which on one side bears against the end of the piston in close contact therewith,
as shown in Figure 2. For the purpose of regulating the pressure between the said
plate and the piston I provide two or more set screws g which are screwed into the
cover a¹. Between the inner end of each screw and the said plate is placed a spring g',
so that by altering the position of the said screws the spring will be more or less
compressed. A pin h fixed to the said disc enters a corresponding hole in the
cylinder cover a¹ and thereby prevents the said disc from turning with the rotary
piston b.
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 :-
First. In a rotary pump or motor the combination with the rotary piston, of
plungers having strips of lignum-vitae leather or other antifriction material inserted
therein, substantially as, and for the purpose, specified.
Second. The combination with the rotary piston, of a plunger provided with the
passage d² and the recess d³, substantially as described.
Third. The combination with the rotary piston, of a plate facted upon by spings,
substantially as, and for the purpose, specified.
"
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.