Improved Automatic Steam Governors for Controlling Winches and other Motors.
Year: 1893

page_text: Date of Application, 5th Aug., 1893
Complete Specification Left, 7th May, 1894-Accepted, 7th July, 1894
PROVISIONAL, SPECIFICATION.
Improved Automatic Steam Governors for Controlling Winches and
other Motors.
I WILLIAM COOKE of Storeton Road, Oxton, in the County of Chester,
Engineer, do hereby declare the nature of this invention to be as follows:-
The invention relates to improvements in governors for which I obtained
British Letters Patent No. 8526 of the year 1892, and the main object is to so
construct such governors as to render them more sensitive and efficient when a
load is being moved, whilst the passage of surplus steam is prevented with greater
certainty.
My improvement consists in combining with the controlling valve a cylinder
open to the live steam and containing a piston or plunger abutting against a
thrust block. In this way the elasticity of the live steam acts in conjunction
with the resilience of the spring or springs so as to allow of great freedom of
motion of the controlling valve whilst serving to keep the said controlling valve
firmly on its seat when no load is being moved.
By the above construction the thrust of the spring or springs required to close
the valve when no load is being moved, is greatly reduced, and in some cases
such spring or springs may be dispensed with.
The controlling valve is of any usual and suitable construction.
1000
Per pro J. T. KING,
J. Johnson,
Agent.
COMPLETE SPECIFICATION.
Improved Automatic Steam Governors for Controlling Winches and
other Motors.
1 WILLIAM COOKE of Storeton Road, Oxton in the County of Chester,
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 :-
The invention relates to improvements in governors for which I obtained British
Letters Patent No. 8526 of the year 1892 and the main object is to so construct
such governors as to render them more sensitive and efficient when a load is
being moved, whilst the passage of surplus steam is prevented with greater
certainty.
My improvement consists in combining with the controlling valve a cylinder
open to the live steam and containing a piston or plunger abutting against
thrust block. In this way the elasticity of the live steam acts in conjunction
with the resilience of the spring or springs so as to allow of great freedom of
motion of the controlling valve whilst serving to keep the said controlling valve
firmly on its seat when no load is being moved.
By the above construction the thrust of the spring or springs required to close
the valve when no load is being moved is greatly reduced and in some cases such
spring or springs may be dispensed with.
The controlling valve is of any usual and suitable construction.

page_text: DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a vertical section of a governor constructed in accordance with my
invention. a is the controlling valve formed with or attached to a piston b free
to slide in a cylinder c. d spring acting to close the valve a against the pressure
of the steam. e screw for adjusting the tension of the spring d. f is a cylinder
secured to the valve a and containing a piston 9 which abuts through the
rodh against the thrust-block i. j passage for admitting steam to the interior of
the cylinder from the steam inlet-way k. l outlet for steam to the winches or
other motors. m by-passage which can be regulated by the screw n for allowing
sufficient steam to pass to the winch to keep it in slow motion. When the pressure
of steam rises in the space ex by reason of a load coming on the winch or motor, the
piston bis forced upwards against the pressure of steam in the cylinder f, and
against the tension of the spring d, and opens the valve a thus allowing a full supply
of steam passing to the winch or motor. When the load is taken off the winch the
pressure in ex falls and the valve a is closed by the spring d and the pressure of
the steam in the cylinder f. It will be obvious that the greater the diameter of the
cylinder relatively to that of the cylinder c, the less will be the tension of the
spring required to keep the valve a closed when there is no load on the winch or
motor while at the same time the valve a is kept firmly to its seat thus preventing the
passage of more steam than is necessary and rendering the governor more sensitive
when a load is on the winch or motor.
Fig. 2 is a vertical section of a modification of governor under my invention in
which the spring is dispensed with. Like letters represent equivalent parts to those
in Fig. 1. Here the controlling valve a is an equilibrium piston valve formed as
part of the piston b and the cylinderfis attached to the cylinder c instead of to the
valve a, the piston g abutting through the rod against the thrust block i formed
as part of the piston b. n set screw and stop for regulating the position of the
valve a so that just sufficient steam shall pass to keep the winch or motor in slow
motion. Steam from the inlet way k is admitted through the passage j above the
piston g and keeps the valve a closed except when a load comes on the winch, and
the pressure of steam in the space c* consequently rises sufficiently to raise the
piston band open the valve and allow of a full supply of steam passing to the winch.
In this modification a spring to assist in closing the valve is not necessary as the
valve a being in equilibrium there is no tendency for the valve to rise except when
the pressure increases in the space c* and the governor will act under varying
pressures of steam without regulation.
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 :-
In governors constructed as above described the combination with the controlling
valve of a cylinder and piston open to live steam and operating substantially as
described for the purposes set forth.