Improvements in Direct Acting Steam Pumps.
Year: 1893

page_text: Date of Application, 4th Nov., 1893
Complete Specification Left, 17th July, 1894-Accepted, 1st Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Direct Acting Steam Pumps.
We, TANGYES LIMITED of Cornwall Works Soho in the County of Stafford,
Engineers, and JOHN NICHOLAS FLOYD, of Cornwall Cottage Murdock Road
Handsworth in the County of Stafford Mechanical Engineer do hereby declare
the nature of this invention to be as follows:-
The said improvements consist in the construction and arrangement hereinafter
described of the parts of duplex and other compound steam pumps whereby the
pumps arranged side by side may be made to work in conjunction with one
another so as to produce a uniform or nearly uniform delivery of water or
liquid, or be used, singly, that is independently of one another.
The said improvements are especially applicable to the steam pumps known in
commerce as "special" steam pumps.
We will describe the said invention in connection with a duplex "special" steam
pump.
In constructing a special steam pump according to the said invention we arrange
the two cylinders side by side, each steam cylinder being fitted with two tappets
one at each end of the cylinder as usual. For convenience of description we will
refer to the two steam cylinders as the first and second cylinders. To either one
of the two steam cylinders which we will call the first steam cylinder an additional
tappet box is fitted. This tappet box is fixed at about the middle of the first
cylinder and contains a lever the end of which projects through a slot into the
cylinder. The said tappet box contains two tappets situated respectively on
opposite sides of the lever and making an angle of about forty five degrees with
each other. When the piston in the said first cylinder is at or about the middle
of its stroke it strikes the end of the lever which is thereby made to act on one of
the tappets, and on making its return stroke the said piston strikes the said lever
in the opposite direction and operates the other tappet. Pipes leading from the
tappet box of the first cylinder are connected with the steam chest of the second
cylinder.
The action of the parts is as follows:-When the piston of the first cylinder has
advanced to about the middle of its stroke it strikes the lever described and
operates one of the tappets in the tappet box on the first cylinder. By this action
the steam in the steam chest of the second cylinder is released and the slide
valve of the said second cylinder reversed and the motion of the piston of the said.
A similar but reverse action takes
second cylinder is at the same time reversed.
place on the return motion of the piston of the first cylinder. By the described
inotions of the pistons a uniform or nearly uniform stream of water or liquid is
delivered by the double pump.
.
By an arrangement of stop cocks the two cylinders may be disconnected and
either of the pumps may be used independently.
Although we have only described the said invention in its application to a pump
having two steam cylinders arranged side by side, yet pumps having three or more
stean cylinders arranged side by side may be connected and controlled from one of
the steam cylinders.
Dated this 4th day of November 1893.
W. T. WHITEMAN,
Agent for the Applicants.

page_text: Improvements in Direct Acting Steam Pumps.
We TANGYES LIMITED, of Cornwall Works, Soho, in the County of Stafford
Engineers, and JOHN NICHOLAS FLOYD of Cornwall Cottage, Murdock Road,
Handsworth in the County of Stafford, Mechanical Engineer, 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 said improvements consist in the construction and arrangement hereinafter
described of the parts of pumps arranged as duplex or compound duplex steam
pumps, whereby the pumps arranged side by side may be made to work in con-
junction with one another so as to produce a uniform or nearly uniform delivery of
water or liquid; or be used singly, that is, independently of one another.
66
66
The said improvements are especially applicable to the steam pumps known in
commerce as special" steam pumps. We will describe the said invention in
connection with the "special" steam pump arranged as a duplex pump. In con-
structing a special" steam pump according to the said invention we arrange the
two cylinders side by side, each steam cylinder being fitted with two tappets, one at
each end of the cylinder as usual. For convenience of description we will refer to
the two steam cylinders as the first and second cylinders. To either one of the
two steam cylinders which we will call the first steam cylinder an additional tappet
box is fitted. This tappet box is fixed at about the middle of the first cylinder
and contains a lever the end of which projects through a slot into the cylinder.
The said tappet box contains two tappets situated respectively on opposite sides
of the lever and making an angle of about forty five degrees with the lever. When
the piston in the said first cylinder is at or about the middle of its stroke it strikes
the end of the lever which is thereby made to act on one of the tappets, and on
making its return stroke the said piston strikes the said lever in the opposite
direction and operates the other tappet. Pipes leading from the tappet box of
the first cylinder are connected with the steam chest of the second cylinder.
The action of the parts is as follows;-When the piston of the first cylinder has
advanced to about the middle of its stroke it strikes the lever described and
operates one of the tappets in the tappet box on the first cylinder. By this action
the steam in the steam chest of the second cylinder is released and the slide valve
of the said second cylinder reversed and the motion of the piston of the said second
cylinder is at the same time reversed. A similar but reverse action takes place on
the return motion of the piston of the first cylinder. By the described motions of
the pistons a uniform or nearly uniform stream of water or liquid is delivered
by the double pump.
By an arrangement of stopcocks the two cylinders may be disconnected and
either of the pumps may be used independently.
We will now proceed to describe with reference to the accompanying drawing
the manner in which the said invention is to be performed.
Figure 1 represents in end elevation and Figure 2 in plan a duplexed "special"
steam pump containing these improvements;
"
Figure 3 represents in vertical section, taken on the dotted line A. B Figure 2,.
a portion of the right hand steam cylinder represented in Figures 1 and 2,
containing the additional tappet box and its tappets and the lever for actuating
the said tappets, and
Figure 4 represents a horizontal section of the tappet box and its contents drawn
to a larger scale.
The same letters of reference indicate the same parts in the several figures of
the drawing.

page_text: a, b are the two steam cylinders of the duplexed pump arranged side by side;
a² is the steam chest of the cylinder a and 62 is the steam chest of the cylinder,
each steam chest being provided with reversing pistons and a slide valve of the
kind represented in Figure 3. Each of the steam cylinders is provided with two
tappets, one at each end of the cylinder as usual. The two end tappets of the
cylinder a are marked c, c and the two end tappets of the other cylinder bare
marked d, d. The tappets c, c and d, d of the cylinders a and b are used for
reversing the slide valves and pistons in the steam chests a², 62 when the two.
cylinders are used independently and the two tappets'd, d of the cylinder bare
also used for reversing the slide valve and pistons in the valve chest 62 and the
working piston e (seen in Figure 3) in the said cylinder at the end of each
stroke of the piston e when the middle tappet arrangement is used with the
cylinder b.
As the reversing pistons of the slide valves in the steam chests a², b² constitute.
no part of this invention, we do not think a further description of the same.
necessary. is the additional tappet box fixed at or about the middle of the
steam cylinder b. The said box contains the lever g turning on the centre h, the
end of the said lever projecting slightly through the slot into the cylinder b
(see Figures 3 and 4). The said tappet box f also contains the two tappets k, l
(see Figure 4) situated respectively on opposite sides of the lever and making
an angle of about 45 degrees with the said lever as represented in Figure 4.
tappets k, are pressed to the seats 2 and 12 by the coiled springs m, m.
part of the box fin which the tappet is situated is connected by the steam pipe n
with one end of the small cylinder of the steam chest a² in which the reversing
pistons work; and that part of the box f in which the tappet is situated is.
connected by the steam pipe p with the opposite end of the said small cylinder of
the steam chest a².
The
That.
When the piston e moving in the cylinder b in the direction indicated by the
arrow in Figure 3, is at or about the middle of its stroke as seen in the said
Figure 3, the said piston e strikes the projecting end of the lever g in the cylinder b
and turns the said lever on its centre in the direction of the arrow in Figure 4.
The said lever g is thereby made to act upon and lift the tappet 1 from its seat (2
in the tappet box f and thereby put the pipe p, connected with the end of the
steam chest a² of the cylinder a, into communication with the cylinder b. The
steam behind one of the pistons in the steam chest a" of the cylinder a is thereby
released and passes by the pipe p into the steam cylinder 6 on the exhaust side of
the piston e in the said cylinder b. The slide valve of the cylinder a is thereby
reversed in the ordinary way and the motion of the piston in the cylinder a is at.
the same time reversed.
A similar but reverse action of the slide valve and reversing pistons of the
cylinder a takes place on the return motion of the piston e of the cylinder b. That
is to say, when the piston e of the cylinder b, moving in a direction opposite to
that indicated by the arrow in Figure 3, has advanced to about the middle of its
stroke, the said piston e strikes the end of the lever g and gives motion to it in a
direction opposite to that indicated by the arrow in Figure 4. By this motion of
the lever g it strikes and lifts the tappet and thereby opens communication, by
means of the pipe n, with the opposite end of the small cylinder of the steam
chest a². The steam at that end of the steam chest is thereby released and
passes by the pipe n into the cylinder b on the exhaust side of the piston e in
the said cylinder b and the slide valve of the cylinder a and its steam piston are
reversed. As soon as the piston e in the cylinder b passes the lever g, the said
lever is returned to its normal position by the pressure of the spring of the tappet
on which it has acted, and the said tappet returning to its seat cuts off
communication of the cylinder with the end of the steam chest of the other
cylinder a.
When the two cylinders a and b are to be used independently, they are.
disconnected by closing the stopcocks or stop valves q, q in the steam pipes n, p.

page_text: By giving the pistons of the two steam cylinders a and b of the double pump the
motions described, a uniform or nearly uniform stream of water or liquid is
delivered by the double pump.
Although we prefer to use an additional tappet box and appliances connected
therewith on one only of the two steam cylinders of the pump, the tappets being
operated at the midstroke of the piston, yet a tappet box and appliances may be
used on each of the cylinders a and to be operated at the midstroke of their
respective pistons for the purpose before described. In this case the end reversing
tappets c, c and d, d only come into operation when the two cylinders a and b are
used independently.
When the middle tappet arrangement is used with the cylinder a as well as with
the cylinder b, steam pipes from the said middle tappet arrangement on the
cylinder a are connected with the ends of the steam chest of the cylinder b.
Although we have only described and represented the said invention in its
application to a pump having two steam cylinders arranged side by side yet pumps
having four or more steam cylinders arranged side by side may be connected and
controlled from one of the steam cylinders in the manner herein before described
and illustrated.
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
the said invention of "Improvements in direct acting steam pumps " ;-
First. The addition to or combination with steam pumps of the kind known in
commerce as "special" steam pumps and other like steam pumps of the mechanism
herein before described and illustrated in the accompanying drawing-for reversing
the slide valve of one or of each of the steam cylinders when its piston is at or
about the end of its stroke by means of the action of the piston in the opposite
cylinder when at or about the middle of its stroke; that is to say, fixing at or near
the middle of one or each of the steam cylinders of the pump an additional tappet
box containing two tappets and a lever between them, which lever is operated by
the piston in the cylinder, the tappet box on one cylinder being connected by
means of steam pipes, provided with stop valves, with the opposite ends of the steam
chest of the other cylinder, the several parts being arranged and operating
substantially as described and illustrated.
Secondly. The application of reversing mechanism of the kind claimed in the
preceding claim to direct acting steam pumps having four or more steam cylinders
arranged side by side, the several steam cylinders being connected to and controlled
from one of the steam cylinders as before described.
Dated the Sixteenth day of July 1894
TANGYES LIMITED,
W. J. PARKINS, Secretary.
JOHN NICHOLAS FLOYD.