IMPROVEMENTS IN OPERATING CORLISS VALVES OF 2 MOTIVE POWER ENGINES 19
Year: 1883

page_text: LETTERS PATENT to John Musgrave of Bolton in the County of Lancaster.
for an Invention of IMPROVEMENTS IN OPERATING CORLISS VALVES OF
2
MOTIVE POWER ENGINES
19
f
:
PROVISIONAL SPECIFICATION left by the said John Musgrave at the
Office of the Commissioners of Patents on the 6th September, 1883.
JOHN MUSGRAVE of Bolton in the County of Lancaster.
OPERATING *CORLISS VALVES' OF MOTIVE POWER ENGINES
"
"IMPROVEMENTS IN
"Corliss valve "
The object of my Invention is to give a traversing motion to a
during the time that it is oscillating to open and close the port.
In performing my Invention I form the valve as usual and I prefer to pass the
spindle through a stuffing box at each end: the ordinary levers for actuating the
valve are secured to one end of the spindle and at the other end is a loose collar
with an eccentric ring on its periphery which rests against a fixed collar on the
valve spindle: the eccentric ring lies in a recess cut in a stationary bracket which
supports the bearing of the valve spindle and collar: a ratchet wheel is cast with
or secured to the collar: the valve spindle projects through the collar and has a
lever with a pawl which acts on the ratchet teeth.
When the valve is operated to open or close the port, the lever and pawl which
rests in the teeth of the ratchet wheel causes the latter. to. make part of. a
revolution and the eccentric ring gives the valve spindle and valve a traversing
motion lengthways of the port.
3
By employing a ratchet wheel and pawl I can alter the working position of the.
valve on its seat, when desired, or by taking the pawl out of gear with the ratchet
wheel, the traverse of the valve ceases.
:
C
In a modification of my Invention I dispense with the ratchet wheel and do not
require to pass the valve spindle through the valve bonnet at each end. :
:
The valve receives a positive traverse motion lengthways of the port at each
stroke of the engine: to accomplish this I form the inner faces of both the. valve
bonnets on an incline or at an angle with the valve spindle also by means of an
eccentric collar on the valve spindle and the ends of the valve which come against
the bonnets are cut at an angle also so that the rocking motion required to open
and close the valve causes it to traverse on its seat at the same time.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Musgrave in the Patent Office on the 4th March 1884.
"IMPROVEMENTS IN
JOHN MUSGRAVE of Bolton in the County of Lancaster
OPERATING CORLISS VALVES OF MOTIVE POWER ENGINES
"
The object of my Invention is to give a traversing motion to a Corliss valve
during the time that it is oscillating to open and close the port.
In performing my Invention I form the valve as usual and I prefer to pass the
spindle through a stuffing box at each end; the ordinary levers for actuating the
valve are secured to one end of the spindle and at the other end is a loose collar
with an eccentric ring on its periphery which rests against a fixed collar on the
valve spindle: the eccentric ring lies in a recess cut in a stationary bracket which
supports the bearing of the valve spindle and collar; a ratchet wheel is cast with or
secured to the collar: the valve spindle projects through the collar and has a lever
with a pawl which acts on the ratchet teeth.
When the valve is operated to open or close the port, the lever and pawl which
rests in the teeth of the ratchet wheel causes the latter to make part of a
revolution and the eccentric ring gives the valve spindle and valve a traversing
motion lengthways of the port.
By employing a ratchet wheel and pawl I can alter the working position of the
valve on its seat, when desired, or by taking the pawl out of gear with the ratchet
wheel, the traverse of the valve ceases.
In a modification of my Invention I dispense with, the ratchet wheel and do not
require to pass the valve spindle through the valve bonnet at each end.
The valve receives a positive traverse motion lengthways of the port at each
stroke of the engine: to accomplish this I form the inner faces of both the valve
bonnets on an incline or at an angle with the valve spindle also by means of an
eccentric collar on the valve spindle and the ends of the valve which come against
the bonnets are cut at an angle also, so that the rocking motion required to open
and close the valve causes it to traverse on its seat at the same time.
And in order that my Invention may be fully understood and readily carried
into effect I will proceed to describe the accompanying three Sheets of Drawings
reference being had to the figures and letters marked thereon.
Figure 1 is an end view and Fig. 2 is a sectional elevation of part of a Corliss
valve to which my Invention is applied.
I make the valve spindle in two parts a a': the valve is free to slide
longitudinally on the part a and the part a' fits into the end of the part a in
which is a slot y: the spindle a¹ is secured to the valve by a cotter passing
through the sloty: the slot y is long enough to allow the spindle a¹ and the valve
to move longitudinally, as hereafter described without moving the spindle a: a³ is
the fixed collar on the spindle a¹: b is the, loose collar on which is formed the
eccentric ring 6 the periphery of which fits in the recess or bearing c in the
bracket c¹ on the other end of the loose collar b which passes through a bearing
in the bracket c', is fixed the ratchet wheel d, to which motion is imparted by the
pawl e, on the lever f which is fixed on the end of the spindle a'
:
When the valve oscillates the lever f on the spindle a¹ also oscillates and the
pawl e causes the wheel d to make part of a revolution at each forward movement
of the valve and the eccentric ring 6¹ being moved in the stationary recess or
bearing e imparts a longitudinal motion to the spindle a' and so to the valve
simultaneously with the oscillating movement, thereby altering the position
of the valve on its seat, thus ensuring greater durability of the working faces of

page_text: the valve. The pawl may be taken out of gear with the ratchet wheel when desired
to stop the longitudinal motion of the valve.
Figs. 3 and 4 show a valve to which a modification of my Invention is applied.
I dispense with the stuffing box on the back bonnet and communicate the
longitudinal movement to the valve by an eccentric ring and ratchet wheel
enclosed in the back bonnet.
a is the valve spindle on which is the loose collar b formed with T arms
parallel with and outside the valve spindle, the ends of which arms are secured to
the valve; on one end of the collar b is secured, or otherwise fixed, the ratchet
wheel d; bis the eccentric ring which fits in the recess c and is loose on the
collar b, in this ring is the pawl or catch e pressed forward by a spiral spring into
contact with teeth formed on the side of the ratchet wheel: when the valvo moves
forward to open the port, the teeth on the ratchet wheel d bear against the pawl e
and turn it and the eccentric ring 62 partly round, thereby moving the collar b and
the valve longitudinally: when the valve moves backward to close the port the
ratchet teeth press the pawl inward and pass over it without turning the ring b³.
Fig. 5 is a sectional elevation. Fig. 6 a plan in section and Fig. 7 is a
transverse section of a valve to which another modification of my Invention is
applied.
2. i are inclines formed on the valve bonnets ¹¹, the highest part of one incline
being opposite the lowest part of the other incline: the ends of the valve have
corresponding inclines ;; which bear against the inclines i i. When the valve is
oscillated the inclines cause it at the same time to be moved longitudinally. An
eccentric collar or ring might be fixed on the valve spindle and enter a recess or
bearing to effect the same object. By the use of my Invention the leakage of
Corliss valves is reduced to a minimum and their durability is greatly increased
Having stated the nature of my Invention and described the manner of
performing the same.
I declare that I claim
1.-Imparting automatically a longitudinal motion to a Corliss valve simultaneously
with its oscillating motion and the mechanism for effecting the same substantially
as shown and described
2.-The mechanism for imparting a longitudinal motion to a Corliss valve as
described and as shown on Figs. 1 and 2.
3.-The mechanism for imparting a longitudinal motion to a Corliss valve as
described and as shown on Figs. 3 and 4.
4. The mechanism for imparting a longitudinal motion to a Corliss valve as
described and as shown on Figs 5, 6, and 7.
In witness whereof I the said John Musgrave have hereunto set my hand
and seal this nineteenth day of February One thousand eight hundred and eighty
four.