Improvements in or relating to Steam and other Motive Power Engines or their Equivalents, and in the Control and Stoppage of the same in Case of Accidents.
Year: 1896

page_text: Date of Application, 13th Apr., 1896
Complete Specification Left, 11th Jan., 1897-Accepted, 13th Mar., 1897
PROVISIONAL DI DUIFICATION.
Improvements in or relating to Steam and other Motive Power
Engines or their Equivalents, and in the Control and Stoppage
of the same in Case of Accidents.
I, WILLIAM CLARKE, Engineer, of No. 15 Townend Street, Sheffield, in
the County of York, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object improvements upon an invention described in the
Specification of Letters Patent granted to me, No. 4085 of 1893, and relates to
steam and other motive power engines or their equivalents in which the said engines
or their equivalents may be stopped by the cut-off of the motive power, and is
intended to minimise the risk and number of accidents which occur, in many cases
attended with loss of life and damage to property, and is so designed that any
person, whether skilled in mechanics or otherwise, can, when needed and at a
moment's notice, bring the said engines or their equivalents to a standstill from any
part of the building or works in which the said engines or their equivalents may
be working.
In applying my invention to a steam engine I construct a special independent
piston valve, which, when open, allows free access of steam from the boilers to the
cylinder or cylinders of the said engines or their equivalents but, when closed,
shuts off the communication from the boilers to the cylinder or cylinders of the
said engines or their equivalents and at the same time opens a direct communication
from the said cylinder or cylinders to the air, thereby at once destroying the
vacuum in the said cylinder or cylinders by exhausting all the steam contained
therein at the moment of closing the aforementioned special independent piston
valve.
I may adopt any of the following methods in the operation or working of my
special independent piston valve, viz. :-
1. The piston valve may be held in its open position by a weighted lever which
is held suspended by a catch lever.
2. I may also hold the piston valve in its open position by means of a coiled
spring in tension on the valve spindle, or a coiled spring in compression on the
top of the valve spindle, which, in either case, may be held suspended direct by
a catch lever.
3. Or I may hold the piston valve in its open position by a combination of
springs, levers and weights.
To close my special independent piston valve, I may, in case 1, by removing the
catch lever, release the suspended weighted lever, which, being connected with
the piston valve spindle, actuates the same by falling and closes the piston valve.
Or in case 2, I may, by removing the catch lever, release the spring in tension
on the valve spindle, or the spring in compression on the top of the valve spindle,
which, actuating the piston valve direct, at once closes the same.
Or, in case 3, I may release the springs, levers and weights in combination,
which, in actuating the valve spindle, close the valve.
The aforementioned catch lever may be actuated by a cord or wire which may
be extended to any part or station in the works. Or it may be actuated by

page_text: electricity, automatically, by hand or otherwise, according to circumstances or as
may be desired.
Dated Anil 12th 1906
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.
Improvements in or relating to Steam and other Motive Power
Engines or their Equivalents, and in the Control and Stoppage
of the same in Case of Accidents.
1, WILLIAM CLARKE, Engineer, of No. 15 Townend Street, Sheffield, in
the County of York, 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 has for its object improvements upon an invention described in the
Specification of Letters Patent granted to me No. 4085 of 1893 and relates to
steam and other motive power engines or their equivalents in which the said engines
or their equivalents may be stopped by the cut-off of the motive power and is
intended to minimise the risk and number of accidents which occur in many cases
attended with loss of life and damage to property, and is so designed that any
person, whether skilled in mechanics or otherwise, can when needed and at a
moment's notice bring the said engines or their equivalents to a standstill from
any part of the building or works in which the said engines or their equivalents
may be working.
In order that my invention may be clearly understood I will describe the same
with reference to the accompanying drawings which illustrate one method of
carrying my invention into effect and in which:-
Fig. 1, is a sectional elevation of the valve box with the piston valve closed.
Fig. 2, a sectional elevation of the valve box with the piston valve open.
Fig. 3, an end elevation with a view of the esoape pipe communicating with
the air.
Like letters of reference in the specification indicate like parts in all the
figures.
In applying my invention to a steam engine I construct a special independent
piston valve A which when open as shown at Fig. 2 allows free access of steam
from the boilers to the cylinder or cylinders of the said engines or their equivalents
as indicated by the arrows a but, when closed as shown at Fig. 1 shuts off the
communication from the boilers to the cylinder or cylinders of the said engines or
their equivalents and at the same time opens a direct communication from the said
cylinder or cylinders to the air through the escape pipe F as indicated by the
arrows b, thereby at once destroying the vacuum in the said cylinder or cylinders
by exhausting all the steam contained therein at the moment of closing the
aforementioned special independent piston valve.
I may adopt any of the following methods in the operation or working of my
special independent piston valve, viz.
1. The piston valve A may be held in its open position shown at Fig. 2 by &
weighted lever B which is held suspended by a catch lever C.
2. I may also hold the piston valve A in its open position by means of a catch
lever directly acting thereon whilst a coiled spring in tension on the valve
spindle D or a coiled spring in compression on the top of the valve spindle D will,
when the valve spindle is released from the catch, close the valve.

page_text: 3. Or I may hold the pistou valve A in its open position by any suitable
combination of springs, levers, and weights.
To close my special independent piston valve I may in case 1, represented in the
drawings by removing the catch lever C release the suspended weighted lever B
which being connected with the piston valve spindle Dactuates the same by falling
and closes the piston valve A.
Or in case 2 I may by removing the catch lever release the spring in tension on
the valve spindle D or the spring in compression on the top of the valve spindle,
which actuating the piston valve direct at once closes the same.
Or in case 3 I may release the springs, levers and weights in combination, which
in actuating the valve spindle, close the valve.
The aforementioned catch lever C may be actuated by a cord or wire E which
may be extended to any part or station in the works. Or it may be actuated by
electricity, automatically, by hand or otherwise, according to circumstances or as
may be desired.
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 :-
1. In a stop motion for motive power engines or their equivalents, the employment
of an independent piston valve in connection with passages in the valve casing in
such manner as to establish a direct communication from the engines to the outer
air at the moment the motive power is cut off, substantially as herein set forth.
2. In a stop motion for motive power engines or their equivalents, the combination
of an independent piston valve and valve casing between the steam boiler or other
source of power and the engine or its equivalent, passages in such casing controlled
by the valve in such manner that the steam or other motive fluid can pass either
to the engine or its equivalent or can be shut off, and direct communication
established between the engine and the outer air, and means for operating such
valve, substantially as herein set forth and for the purpose stated.
Dated January 11th 1897
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.