Improvements in Cocks.
Year: 1892

page_text: Date of Application, 22nd Nov., 1892
Complete Specification Left, 21st Aug., 1893-Accepted, 23rd Sept., 1893
:
PROVISIONAL SPECIFICATION.
Improvements in Cocks.
:
We JOHN DEWRANCE and GEORGE HENRY WALL both of 158 Great Dover
Street, London S.E. Engineers, do hereby declare the nature of this invention to be
as follows:
With high pressure the surfaces of the plug and shell of a cock are liable to be
cut away.
In carrying ont our invention we construct a cock which has a plug in
two parts, the lower part is practically a taper bush with orifices in its sides for
the passage of fluid; and the upper part is a hollow or tubular head that passes
through the cover and the gland, these two parts are suitably connected so that
the head will turn the lower part.
Inside this plug we provide a second or inner plug the spindle or head of which
passes out through the head of the outer plug which has a stuffing box. If the
plug is inverted and has the large part at the opposite end to the head or if the
plug is parallel so that the inner plug can be put in from the opposite end,
the outer plug may be made in one piece.
We prefer to adapt our invention to a cock having an interchangeable liner as
described in Specification No. 1213 of 1892, though the invention is manifestly
applicable to other forms of cocks.
On the cover it is desirable to attach or fit suitable stops against which handles
for turning the plugs engage when open and when shut.
When it is desired to open the cock the outer plug is turned a quarter of a turn
carrying with it the inner plug. The outer plug now stands with its orifices for
the fluid in a line with those of the shell of the cock but during this operation
there has been no rush of fluid because the inner plug is still closed. The inner
plug is then turned a quarter of a turn which opens the passage for the fluid; to
shut the cock off again the internal plug is first turned back and then the outer
plug.
The surface of the internal plug and the inside of the outer plug are exposed to
the cutting action and to the rush of the fluid while being opened, but these
surfaces may be very much cut away before they allow such an amount or rush
of fluid as would injure the outside surfaces of the outer plug or the packing in
the liner or shell of the cock.
:
These latter surfaces and the packing are depended upon to keep the cock fluid
tight and they are protected from the rush and cutting action of the fluid by the
inner plug when worked as herein before described.
Dated this 22nd day of November 1892.
JOHN DEWRANCE.
GEORGE HENRY WALL.
COMPLETE SPECIFICATION.
Improvements in Cocks.
We JOHN DEWRANCE and GEORGE HENRY WALL both of 158 Great Dover
Street London, S.E., Engineers, 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 :-
With high pressure the surfaces of the plug and of the packing, liner or shell
of a cock are liable to be cut away. In carrying out our invention we construct a
cock which has a plug in two parts, the lower part is practically a taper bush with

page_text: orifices in its sides for the passage of fluid; and the upper part is a hollow or
tubular head that passes through the cover and the gland, these two parts are
suitably connected so that the head will turn the lower part..
Inside this plug we provide a second or inner plug the spindle or head of which
passes out through the head of the outer plug which has a stuffing box. If the
plug is inverted and has the large part at the opposite end to the head or if the
plug is parallel so that the inner plug can be put in from the opposite end,
the outer plug may be made in one piece.
We prefer to adapt our invention to a cock having an interchangeable liner as
described in the Specification of Patent No. 1213 of 1892; though the invention
is manifestly applicable to other forms of cocks.
On the cover it is desirable to attach or fit suitable stops against which handles
for turning the plugs engage when open and when shut.
When it is desired to open the cock the outer plug is turned a quarter of a turn
carrying with it the inner plug. The outer plug now stands with its orifices for
the fluid in a line with those of the shell of the cock but during this operation
there has been no rush of fluid because the inner plug is still closed. The inner
plug is then turned a quarter of a turn which opens the passage for the fluid; to
shut the cock off again the internal plug is first turned back and then the outer
plug.
.
The surface of the internal plug and the inside of the outer plug are exposed to
the cutting action and to the rush of the fluid while being opened and closed, but
these surfaces may be very much cut away before they allow such an amount or
rush of fluid as would injure the outside surfaces of the outer plug or the surfaces
of the packing or the liner or the shell of the cock.
These latter surfaces are depended upon to keep the cock fluid tight and they
are protected from the rush and cutting action of the fluid by the inner plug when
worked as hereinbefore described.
On the accompanying sheet of drawings Fig. 1, is a sectional elevation and
Fig. 2 a sectional plan on line X, X, shewing the application of our invention to
an interchangeable liner asbestos packed cock; the construction of the inter-
changeable liner is described in the Specification of Patent No. 1213 of 1892 and
for the purpose of simplifying the description we do not in this. Specification
distinguish between the liner and the shell of which it forms part.
;
Fig. 3 is a sectional elevation and Fig. 4 a sectional plan shewing the application
of our invention to an asbestos packed cock without the interchangeable liner
Fig. 5 is a front view of the handle required for the cock as shewn in Figs. 3
and 4. Fig. 54 is a part elevation of the head D. Fig. 6 is a sectional elevation
and Fig. 7 a sectional plan shewing the application of our invention to a ground
plug cock.
The corresponding parts throughout the drawings are indicated by like letters
of reference.
A is the shell of the cock, B is the packing, C is the lower part of the outer
plug and D the upper part or tubular head that passes through the cover and the
gland; these two parts are suitably connected at E, so that the head will turn the
lower part.
The outer plug C is always turned to full open or full shut and it is the outside
surface of this plug and the surfaces of the packing B or of the inside surface of
the shell A against which the plug bears that are depended upon to keep the cock
fluid tight when closed. F is the inner plug the spindle or head of which passes
out through the head D of the outer plug by the stuffing box G. The inner plug
is used to regulate the flow of the fluid but its surfaces are not depended upon to
keep the cock fluid tight.
In Figs. 1 and 2 the handle H turns the outer plug and the handle J turns the
inner plug; K is the stop against which the handle H engages when shut and L is
the stop against which the handle J engages when shut.
In Figs. 3 and 4 the handle M is provided with grooves N, N, which engage

page_text: with stops O, O, these stops working in the grooves provide that the handle turns
both plugs together the first quarter of a turn when the handle drops and
disengages the head of the outer plug, the inner plug can then be turned alone
another quarter of a turn opening the cock for the passage of fluid. To shut the
cock this operation is reversed.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The improved apparatus and arrangement hereinbefore described whereby in a
cock the surfaces of the outer plug and of the packing or liner or shell that are
depended upon to keep the cock fluid tight when closed are protected while the
cock is being opened and closed from the rush of the fluid by an inner plug that
also regulates the flow of the fluid substantially as described and illustrated by the
accompanying drawings.
Dated this 21st day of August 1893.
JOHN DEWRANCE.
GEORGE HENRY WALL.