Improvements in Pumping Engines and other Engines having their Valves Operated by Steam or other Motive Fluid.
Year: 1890

page_text: Date of Application, 16th Sept., 1890.
Complete Specification Left, 4th Mar., 1891-Accepted, 11th Apr.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Pumping Engines and other Engines having their
Valves Operated by Steam or other Motive Fluid.
I, 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:-
My invention relates to pumping engines and other engines having their valves
operated by steam or other motive fluid and is intended more especially for use with
pumping engines of the kind known as Tangye's special pumping engines.
In these and other engines wherein the valves are operated by steam or motive
fluid it has been customary to admit the motive fluid to the cylinders in which the
pistons of the valve are situated through perforations made through the said pistons.
This has given rise to considerable inconvenience in obtaining access to the said
perforations as the engines have to be stopped and the covers of the said cylinders
removed before access can be obtained. The object of my invention is principally
to overcome this objection and to render it possible to readily adjust the passages,
for the steam or motive fluid, from the exterior, without stopping the engine or
removing any of the parts. This enables me to readily adjust the area of the
passages to suit the pressure at which the engine is working.
According to my invention I make the communications, between the place from
which the motive fluid to actuate the valve is obtained, to the cylinders in which the
pistons of the valves are situated by perforations made through the casting or
cylinder itself or by external pipes and I provide the perforations or pipes each with
a valve or choking screw by means of which the area of the perforations or passages
can be adjusted the head of the screw or the like projecting to outside the cylinder
in a position to be readily operated. I preferably arrange it at the upper side of
the casting or cylinder. In order to prevent the valve or screw from being com-
pletely closed and the engine stopped by inexperienced persons I provide means
whereby when the screw or valve is closed to the fullest extent possible there still
remains sufficient passage for steam or motive fluid to prevent the complete stoppage
of the engine. This for instance may be effected by making stops on the screws or
by making them so that there is always a small passage open through, or past them,
or even by making small perforations through the pistons but not sufficiently large
to prevent the regulation through the main supply perforations or passages through
the casting or pipes aforesaid. In order to secure a proper closure of the passages
by which the aforesaid cylinders of the valve pistons are exhausted of steam, I
provide each piston with a piece secured thereto in such a position that when the
piston approaches or reaches the end of its outward stroke the said piece covers the
exhaust opening. The said piece is pressed into contact with the inner surface of
the cylinder which may be done by means of a spring at its back pressing it towards
the said surface.
Dated this 16th day of September 1890.
J H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Pumping Engines and other Engines having their
Valves Operated by Steam or other Motive Fluid.
I, JOHN NICHOLAS FLOYD, of Cornwall Cottage, Murdock Road, Handsworth,
in the County of Stafford, Mechanical Engineer, 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:-
My invention relates to pumping engines and other engines having their valves
operated by steam or other motive fluid and is intended more especially for use with
pumping engines of the kind known as "Tangye's special pumping engines."
In these and other engines wherein the valves are operated by steam or motive
fluid it has been customary to admit the motive fluid to the cylinders in which the
pistons of the valve are situated through perforations made through the said pistons.
This has given rise to considerable inconvenience in obtaining access to the said
perforations as the engines have to be stopped and the covers of the said cylinders
removed before such access can be obtained. The object of my invention is
principally to overcome this objection and to render it possible to readily adjust the
passages, for the steam or motive fluid, from the exterior, without stopping the
engine or removing any of the parts. This enables me to readily adjust the area of
the passages to suit the pressure at which the engine is working.
I will describe with reference to the accompanying drawings the application of
my invention to the engine of a Tangye's special pump from which its analogous
applications will also be understood.
Figure 1 is a longitudinal section and Figure 2 is a plan.
I make the communications between the place A from which the motive fluid to
actuate the valve is obtained, to the cylinders B, B, in which the pistons B2, B2, of
the valve B3 are situated, by perforations C, C, made through the casting or cylinder
itself and I provide these perforations each with a choking screw D or equivalent
device by means of which the area of the perforations or passages can be adjusted
the heads of the screws or equivalent device projecting to outside the cylinder in a
position to be readily operated. I preferably arrange the said screw or like device
at the upper side of the casting or cylinder. In order to prevent the screw or like
device from being completely closed and the the engine stopped by inexperienced
persons I provide means whereby when the screw or the like is closed to the fullest
extent possible there still remains sufficient passage for steam or motive fluid to
prevent the complete stoppage of the engine. This for instance may be effected by
making stops on the screws or by making them so that there is always a small
passage E open through, or past them, or even by making small perforations through
the pistons but not sufficiently large to prevent the regulation through the main
supply perforations through the casting or cylinder as aforesaid.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :--
In the engines of Tangye's special pumps or other engines with valves operated
by steam or other fluid pressure passages for the steam or motive fluid made in the
casting or cylinder and with screws or the like which can be operated from outside
for regulating the said passages substantially as hereinbefore described and illustrated
in the accompanying drawings.
DL 1
PM 1 1001
JOHN NICHOLAS FLOYD.