Year: 1886

page_text: I DAVID JOY of 8 Victoria Chambers in the City of Westminster, Engineer do
hereby declare the nature of this Invention to be as follows:-
My Invention has reference to steam or other motive power Engines actuated by
fluid pressure. According to my said Invention I give to the valves of such
Engines a part of their motion from some moving part of the Engine itself-The
remaining part of the motion of the said valves being imparted by the pressure of
the fluid actuating the Engine itself.
For example I give motion to one end of a lever say from the cross head
connecting rod or eccentric the other end of the said lever being moved by the
fluid pressure in a small Cylinder the valve of which is actuated by any ordinary
valve gear controlled or not by the motion of the piston of such small Cylinder
through the intervention of a lever or the control may be effected only by choking
the ports of the Cylinder-From a suitable point on this lever so receiving a com
bined motion lead the valve spindle link which receives a definite motion (that
for lap and lead) from the end attached to the Engine and a motion under control
(for port opening and reversal) from the point attached to the small Cylinder, and
thus all the motions required for reversal or expansive working are obtained.
Or I give a motion to the main valve by a lever as before but having a fixed
fulcrum which will move it through that part of its stroke required for "lap" and
"lead" and the remainder of the stroke due to port opening is obtained by moving
the valve or a part of the vive forward through the action of a small Cylinder
which may form a part of the valve and receive its motive power from the steam
or motive fluid admitted already as lead into the port of which it is to complete
the opening-Or as in the former case this small Cylinder may be provided with
its complete valve gear-Or I give the main valve the whole of its motion by
means of a small Cylinder actuated by fluid pressure-the valve of which is
actuated by any ordinary valve gear (suitable for reversal and cutting off for
expansion or not) and controlled by the motion of the piston of such small
Cylinder for example through a lever carried by it so that the movement of the
main valve attached directly to this piston shall be practically in unison with the
movement of the small valve worked directly by the main Engine-Hence all
the movements of the valve for reversal and expansive working will be obtained,

page_text: In carrying out my Invention I do not limit myself to the particular or precise
mechanism I have described as I have given them only as examples of the ways in
which my Invention may be carried out and parts of one method may be combined
with parts of another, the same end being served, nor do I confine myself to the
use of any particular fluid pressure, which may be either the pressure already pro-
vided in the boiler or reservoir of force-air water steam or the like-but it may
be a fluid pumped to pressure specially-I prefer however to use a nonelastic fluid
for action in the small Cylinder as such fluid may be controlled definitely in its
flow, and so may be made to control the speed of the Engine or in Marine Engines
to prevent racing without the need for other Governors.
Dated this 11th day of February 1886.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said David Joy.

page_text: I, DAVID JOY of 8 Victoria Chambers in the City of Westminster, 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 has reference to steam or other motive power Engines actuated by
fluid pressure.
According to my said Invention 1 give to the valves of such engines a part of
their motion from some moving part of the engine itself the remaining part of the
motion of the said valves being imparted by fluid pressure which may be that of
the fluid actuating the engine itself or fluid pressure otherwise derived.
accompanying drawings illustrate ways in which my invention may be carried out
in practice.
The
In the example shewn on the left hand side of Figure 1 I give motion to one end
of a lever A from the cross head B the other end of the said lever being moved by
the fluid pressure in a small cylinder the valve D of which may be actuated by
any ordinary valve gear controlled by the motion of the piston of such small
cylinder through the intervention of a lever E the actuation and control of this
small valve motion may however be effected in any other suitable way for example
by reversing and choking the ports of the small cylinder as in Figure 2.
The arrangement shewn on the left hand side in Figure 1 for moving the valve
of this small cylinder, is a combination of motions derived from fluid pressure and
from the motion of the engine itself the motion from fluid pressure being derived
from the piston of the small cylinder C being attached to one end of the lever E
the other end of the said lever being connected with and deriving motion from the
crank shaft through the rods bc and block e in the curved carrier e². The centre
upon which the rod c turns is adjustable by the handle d. for the necessary
variation and control of the valve's motions.
From a suitable point e³ on the lever A so receiving a combined motion I lead the
link of the main valve spindle F which receives a definite motion (that for lap and
lead) from the end attached to the engine and a motion under control (for port
opening and reversal) from the point attached to the small cylinder and thus all the
motions required for reversal or expansive working are obtained. Where the
motion of the main valve is produced as in Figure 2 the valve of the small cylinder
being only worked by a single excentric, reversal being obtained by reversing the
ports for inlet or outlet and control by choking the said ports this may be effected
by the hand lever and connections shewn. The motion for lap and lead may be
taken from the air pump lever A¹ as shewn on right hand side of Figure 1 instead
of being taken from the special lever A. The valve gear for working the valve of
the small Cylinder may be a link or any other suitable gear.
Or I give motion to the main valve by a lever A as before but having a fixed
fulcrum a Figure 3, which will move it through that part of its stroke required for
"lap" and "lead" and the remainder of the stroke due to port opening is obtained
by moving the main valve F, or a part of it, forward through the action of a small
cylinder which may form a part of the main valve and receive its motivo

page_text: power from the steam or motive fluid admitted already as lead
"into the port of
which it is to complete the opening. This steam passing along the opening Gin
the valve to the piston D' of the small cylinder gives motion to the valve to fully
open the port, the motion for exhaust being reversed. Or as in the former case this
small cylinder may be provided with its complete valve gear and may be arranged
outside the main valve casing.
Or as shewn in Figure 4 I give the main valve the whole of its motion by
means of a small cylinder C actuated by fluid pressure, the valve D of which small
cylinder is actuated by any ordinary valve gear (suitable for reversal or cutting off
for expansion or not) and controlled by the motion of the piston of such small
cylinder through the arm H and a lever E so that the movement of the main valve
attached directly to the piston shall be practically in unison with the movement of
the small valve worked directly by the main engine. Hence all the movements of
the valve for reversal and expansive working will be obtained by fluid pressure
controlled by the motions of the engine.
pressure
In carrying out my Invention I do not limit myself to the particular or precise
mechanisms I have described as I have given them only as examples of the ways in
which my Invention may be carried out and parts of one method may be combined
with parts of another method the same end being served, nor do I confine myself
to the use of any particular fluid pressure which may be either the
already provided in the Boiler or reservoir of force (air water steam or the like) or
it may be a fluid pumped to pressure specially. I prefer however to use a non-
elastic fluid for action in the small cylinder as such fluid may be controlled
definitely in its flow and so may be made to control the speed of the engine or in
marine engines to prevent racing without the need for other Governor.
I am aware that the valves of Steam Hammers, Pumps and Engines have been
moved by the motive fluid of the engine itself and I do not claim its use broadly
for that purpose.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
First-In motive power engines means for the actuation of the valves by a
combined motion partly derived from a moving part of the engine itself and partly
by fluid pressure substantially as hereinbefore described with reference to Figures 1.
2 and 3 of the accompanying Drawings.
Second Actuating the valves of steam and other fluid pressure engines by
fluid pressure but controlled by the motion of the engine as herein described with
reference to Figure 4.
Third-The several arrangements and constructions of parts herein before
described and illustrated in the several Figures of the accompanying Drawings.
Dated this 11th day of November 1886.
J. HENRY JOHNSON.