Improvements in Valve Mechanism for Engines Operated by Steam or other Expansible Fluid.
Year: 1896

page_text: Date of Application, 25th Jan, 1890
Complete Specification Left. 1st May, 1896-Accepted, 6th June, 1896
Date of
Complete Specification Left, 1st May, 1896-Accepted, 6th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in Valve Mechanism for Engines Operated by Steam
or other Expansible Fluid.
I, COURTENAY WILLIAM THOMPSON, of 30 College Road, Bromley, in the
County of Kent, Mining Engineer, do hereby declare the nature of my invention
to be as follows:-
The object of my present invention is to effect the reversal of the engine and the
control of the reversing lever independently of the control of the variable expansion
mechanism.
I combine a shaft governor, or equivalent mechanism after the manner illustrated
by the accompanying diagram, in order to produce a reversing link from the
variable forward movement of such shaft governor.
The diagram is given in order to explain more clearly the nature of my
invention but I do not limit myself to the particular device illustrated by the said
diagram.
The eccentric N illustrates an ordinary eccentric, it being controlled by a shaft
governor or equivalent mechanism. Such mechanism. as the eccentric N is
connected at A with the link A. C. A is say the forward end of the link and in
the ordinary case a reverse eccentric would be attached at C, but, instead, I place
an eccentric as O. (of required length of travel) opposite or approximately opposite
to the crank and I attach it to, or approximately to the centre of the link
at B. Any equivalent mechanism to the eccentric O may be used instead of the
eccentric O.
The link A. C. constitutes a reversing link in which A is say the forward end
and C is the reverse end or vice versa. The block D transmits the movement of the
link to the valve spindle E and is itself controlled by the reversing lever by the
attachment at D¹. The link A. C. is supported by the swinging attachments
at F and B. The shaft governor will then suitably control the valve when the
block D is in forward or reverse position.
This mechanism may operate either the main valve or an auxiliary expansion
valve. In the latter case a main valve may be operated in any suitable manner and
in which case also this mechanism may be reversed simultaneously with that for the
main valve.
This mechanism may be modified so that a link such as A. C. may be moved on
the block D, in controlling the reversing lever, and other modifications, having
equivalent results, may be used, without departing from the nature of my
invention.
Dated this 24th day of January 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.

page_text: Improvements in Valve Mechanism for Engines Operated by Steam
or other Expansible Fluid.
I, COURTENAY WILLIAM THOMPSON, of 30 College Road, Bromley, in the
County of Kent, Mining Engineer, do hereby declare the nature of my invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
The object of my present invention is to effect the reversal of the engine and the
control of the reversing lever independently of the control of the variable expansion
mechanism.
I combine a shaft governor or equivalent mechanism after the manner hereinafter
described in order to produce a reversing link from the variable forward movement
of the shaft governor.
Referring first to the diagram given in my Provisional Specification in order to
explain the nature of my invention ;-The eccentric N illustrates an ordinary
eccentric it being controlled by a shaft governor or equivalent mechanism which
being in itself well known it is not necessary for me to illustrate. Such mechanism
as the eccentric N is connected at A with the link A. C. A, is, say the forward
end of the link and in the ordinary case a reverse eccentric would be attached at C,
but instead, I place an eccentric, as O, (of required length of travel) opposite, or
approximately opposite, to the crank, and I attach it to, or approximately to, the
centre of the link at B; any equivalent mechanism to the eccentric O may be used
instead of the said eccentric.
The link A. C. constitutes a reversing link in which A is, say, the forward end,
and C is the reverse end, or vice versa. The block D transmits the movement of
the link to the valve spindle E, and is itself controlled by the reversing lever by
the attachment at D¹.
The link A. C is supported by the swinging attachments at F and B. The shaft
governor will then suitably control the valve when the block D is in forward or
reverse position.
This mechanism may operate either the main valve or an auxiliary expansion
valve. In the latter case, a main valve may be operated in any suitable manner
and in which case also this mechanism. may be reversed simultaneously with that of
the main valve.
I do not limit myself to the arrangement shewn in the aforesaid diagram,
for example, this mechanism may be modified so that a link, such as A. C, may be
moved on the block D in controlling the reversing lever, and other modifications
having equivalent results may be used without departing from the nature of my
invention, and in the accompanying diagrams I bave shewn further examples.
In Figure 2, N is the eccentric controlled by the shaft governor or equivalent
mechanism and attached to the link A. B. C. at A. B in the centre of the same
link is attached to the eccentric O set opposite to the crank (the eccentric O may
be set otherwise in a line with the crank in accordance with the position of the
eccentric N and according as the valve is of inside, or outside, type) and having its
half travel equal to the lead of the eccentric N on either side of the centre.
A. B. C. constitutes a reversing link, A being the forward end and C the reverse.
The gear is shewn in reverse position. The block D, which operates the valve
spindle E is moved in the reversing link through the reversing shaft H which is
attached at D¹.
The link A. B. C. is supported at B by the rocking lever B. X.
In Figure 3 the reversing link A. B. C is moved on the block D which operates
the valve spindle direct

page_text: The eccentrics N and O operate in the same way as in Figure 2 and their
respective motions are transmitted to similar positions in the link, the eccentric N
by the rods N¹ and N" and the eccentric by the rods O' and O. The eccentrics
are thus jointed to, and supported by, the rocking lever X. The link A. B. C is
shewn in mid position and it is moved through the reversing shaft H and the
connection at D¹.
Any equivalent for the eccentric O (for attachment to the centre of the link) as
for instance a lever operated from the cross-head of the engine and other equivalent
mechanisms may readily be applied in arrangements according to this invention.
Any such reversing mechanism as I have herein described may be used to
operate an ordinary main or expansion valve.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is.-
1. Mechanism for the application of reversing gear to a shaft governor or
equivalent mechanism in the manner substantially as and for the purpose
hereiubefore explained.
2. The several arrangements of mechanism bereinbefore described and illustrated
in the diagram accompanying my Provisional Specification and the diagrams
accompanying this Specification.
Dated this 1st day of May 1896
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.