IMPROVEMENTS IN WORKING THE VALVES OF THE GOVERNORS OF STEAM AND OTHER LIKE MOTIVE POWER ENGINES
Year: 1879

page_text: LETTERS PATENT to James Tangye, of Illogan, in the County of Cornwall,
Mechanical Engineer, for the Invention of "IMPROVEMENTS IN WORKING
THE VALVES OF THE GOVERNORS OF STEAM AND OTHER LIKE MOTIVE POWER
ENGINES."
Sealed the 6th February 1880, and dated the 13th September 1879.
PROVISIONAL SPECIFICATION left by the said James Tangye at the Office
of the Commissioners of Patents on the 13th September 1879.
JAMES TANGYE, of Illogan, in the County of Cornwall, Mechanical Engineer.
"IMPROVEMENTS IN WORKING THE VALVES OF THE GOVERNORS OF STEAM AND
OTHER LIKE MOTIVE POWER ENGINES."
My Invention consists of the improvements in an Invention for which Letters
Patent were granted to me dated November the 27th 1878, No. 4838.
The improvements in the said Invention constituting my present Invention are
as follows:-
In the Invention described in the Specification of the Patent referred to the
spring which presses the sliding bar upwards to its bearing against the fingers of
the governor pendulums is placed in the body of the governor. Instead of placing
the said spring in that position I place it on the top of the case containing the
lever by which the motion of the said sliding bar is transmitted to the valve.
The regulating screw for adjusting the strength of the spring I place in the shackle
on which the sliding bar rests. In the top of the socket of the shackle I fix a step
bearing to receive the conical lower end of the sliding bar, and on the top of the
said bar I place the slipper on which the fingers of the pendulums bear. These
slippers are dovetailed into the top of the said bar and engage therein by a sliding
motion at right angles to the axis of the said bar. By this construction the
accidental displacement of the slippers is prevented.
The finger of one pendulum is single and bears on the middle of the slipper; the
finger of the other pendulum is double or forked, and the single finger of the
one pendulum is situated between the arms of the forked finger of the other
pendulum.
By this arrangement the strain on the axes of the said pendulums is equalized
and the bearing of the fingers on the slipper is in the line of the axis of the sliding
bar carrying it.
By the removal of all oblique pressure from the axes of the pendulums and from
the sliding bar on which they operate, the parts move with great facility and are
consequently very sensitive.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Tangye in the Great Seal Patent Office on the 26th February
1880.
JAMES TANGYE, of Illogan, in the County of Cornwall, Mechanical Engineer.
"IMPROVEMENTS IN WORKING THE VALVES OF THE GOVERNORS OF STEAM AND
OTHER LIKE MOTIVE POWER ENGINES.".
My Invention consists of improvements in an Invention for which Letters Patent
were granted to me dated November the 27th 1878, No. 4838.
The improvements in the said Invention constituting my present Invention are
as follows:
In the Invention described In the Specification of the Patent referred to the
spring which presses the sliding bar upwards to its bearing against the fingers of
the governor pendulums is placed in the body of the governor. Instead of placing
the said spring in that position I place it on the top of the case containing the
lever by which the motion of the said sliding bar is transmitted to the valve. The
regulating screw for adjusting the strength of the spring I place in the shackle on
which the sliding bar rests.
In the top of the socket of the shackle I fix a step bearing to receive the
conical lower end of the sliding bar, and on the top of the said bar I place the
slippers on which the fingers of the pendulums bear. These slippers are dovetailed
into the top of the said bar and engage therein by a sliding motion at right angles
to the axis of the said bar. By this construction the accidental displacement
of the slippers is prevented.
The finger of one pendulum is single and bears on the middle slipper; the finger
of the other pendulum is double or forked, and the arms bear on the outside slippers,
and the single finger of the one pendulum is situated between the arms of the
forked finger of the other pendulum. By this arrangement the strain on the axes
of the said pendulums is equalized and the bearing of the fingers on the slippers is
in the line of the axis of the sliding bar carrying them.
By the removal of all oblique pressure from the axes of the pendulums and from
the sliding bar on which they operate, the parts move with great facility and are
consequently very sensitive.
I will now proceed to describe with reference to the accompanying Drawing the
manner in which my Invention may be performed.
Figure 1 represents in vertical section a steam engine or other like governor
containing parts constructed according to my present Invention for working the
valve of the said governor; Figure 2 represents partly in side elevation and partly
in vertical section a portion of the governor, the section being taken in a plane at
right angles to that in which the section of Figure 1 is taken; and Figure 3 is a
horizontal section, partly in plan, of the governor, taken on the line x, x, Figure 1;
Figure 4 is an enlarged view of a portion of Figure 2.
The same letters of reference indicate the same parts in the several Figures of
the Drawing.
a is the rotating tube carrying the pendulums b, b, the said tube a being rotated
in the ordinary way through the shaft c and bevil gearing d; 62, 63, are the fingers
of the pendulums, and 6, 6, are the axes on which the said pendulums turn; e is
the sliding bar of the governor working in the rotating tube a and pressed upwards
against the fingers 62, 63, of the pendulums b, b, by the coiled or ribbon spring f. The
said spring fis situated on the summit of the case g containing the arm or lever h,
forming part of the mechanism by which the motion of the sliding bar e is trans-
mitted to the governor valve. The said summit of the case g is shaped to form a
seat or abutment for the base or larger end of the spring f, the other end of the said
spring seating itself against the collar on the bottom of the regulating screw i,
the said screw i being used for adjusting the strength of the said spring. The said

page_text: adjusting screw i is carried by the shackle of the transmitting mechanism of the
governor. For this purpose the shackle is furnished with a tubular part or socket /*
which is screwed internally for receiving the regulating screw i. In the top of the
socket 12 of the shackle is a step bearing m for receiving the conical lower end of
the sliding bar e. On the top of the sliding bar e are the slippers p, p², p², on
which the pendulum fingers 62, 63, bear.
It will be seen by an examination of Figure 2 and the enlarged view Figure 4
that the said slippers consist of three parts, marked respectively p, p³, p², the
middle part or slipper p being dovetailed into the dovetailed seat p³, which is
pinned to the head of the sliding bar e, the said middle slipper p being engaged
with the part ps by a sliding motion. The said middle slipper p is furnished with
a double dovetail, the lower dovetail for engaging with the dovetailed seat p³, and
the upper dovetail for the side slippers 22, 23, to engage with, as best seen in
Figure 4. The middle slipper p is kept from rising when its pendulum lever is
removed from the frame p, carrying it by the lower dovetail, and similarly the
side slippers p, p, are prevented from rising by the single dovetails on the sides of
the middle slipper p and the supporting frame p4, nor can any of the slippers p, p³, p²,
slide endway far enough for their removal when the pendulum finger are in their
places.
The construction of the fingers of the pondulums is best seen in the horizontal
section, Figure 3. The finger bª of one of the pendulums b, b, is single and bears
on the middle slipper p, and the finger 62, 62, of the other pendulum b is double or
forked, the arms of the double finger bearing on the outside slippers p², p², and the
single finger 6 is situated between the arms of the forked finger 62, 62, as seen in
the said Figure 3. By this arrangement the strain on the axes b, b of the pen-
dulums b, b, is equalized, and the bearing of the fingers 62, 63, on the slippers is in
or nearly in the line of the axis of the sliding bar e carrying the said slippers, and
the advantages herein before pointed out are thereby obtained.
q is the sliding valve of the governor and r is the valve seat perforated at its
sides and closed at top, the said valve seat being fixed in the valve case 8. Steam
is admitted by the pipe t and escaping through the open valve seat enters the
pipe u on its way to the steam chest of the engine, as usual. The valve consists
of a cylindrical cap sliding closely over the valve seat r. It is perforated at top
and steam enters the valve and rising up the hollow valve rod or spindle q² passes
into and fills with steam the case g so as to balance the valve. This construction
of valve is fully described in the Specification of the Patent herein before referred
to, and constitutes no part of my present Invention.
The motion of the sliding bar e on which the fingers of the pendulums act is
transmitted to the governor valve q through the shackle 1, 2, and the mechanism
described and represented in the Specification of the Patent before mentioned, to
the arm or lever h in the case g, the said arm or lever engaging with the valve rod
or spindle q², so that as the sliding rod e is depressed a corresponding depression is
given to the valve q and the latter made to close more or less the steam passages
in the valve seat r, as is well understood.
Having now described the nature of my Invention, and the manner in which
the same is to be performed, I wish it to be understood that I claim as my
Invention of "Improvements in Working the Valves of the Governors of Steam and
other like Motive Power Engines,"-
First. Seating the coiled spring by which the sliding bar on which the fingers of
the pendulums bear is raised against the said fingers on the summit of the case g,
the said coiled spring being used in combination with the regulating screw i, and
the modified shackle 1, 12, substantially as herein before described and illustrated in
the accompanying Drawing.
Secondly. Constructing and arranging the fingers of the pendulums of the
governor, substantially as and for the purpose herein before described and illustrated
in the accompanying Drawing.

page_text: Thirdly. The method, herein before described and illustrated in the accompanying
Drawing, of constructing the slippers of the sliding bar on which the pendulum
fingers bear.
In witness whereof, I, the said James Tangye, have hereunto set my hand and
seal, this Nineteenth day of February, in the year of our Lord One thousand
eight hundred and eighty.
Witness,
FRED. WM. STURGE,
Illogan,
Cornwall.
JAMES TANGYE. (L.S.)