Improvements in Cocks.
Year: 1892

page_text: Date of Application, 21st Jan., 1892
Complete Specification Left, 21st Oct., 1892-Accepted, 26th Nov., 1892
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:-
We make the plug cavity of the cock larger than usual and introduce a loose
metallic liner that can be replaced when necessary; the inner surface of the liner
has grooves surrounding the water ways. While the plug of the cock is in place
we caulk into these grooves asbestos coated with a suitable material so that it will
cement itself when subjected to heat, or the coated asbestos may be laid into the
grooves and the plug forced down upon it.
The joints between the liner and the shell of the cock is made fluid tight either
by caulking such a material as asbestos into grooves or by washers surrounding the
water ways. A suitable stop is provided to prevent the liner turning and the cover
is arranged to press upon packing at the top of the liner in such a way as to keep
it in place; instead of the complete liner we may employ one or two segments
which contain the packing that surrounds the water way, in this case the packing
can be more conveniently laid into the grooves; these segments are by preference
prevented from turning by suitable ribs or projections in the plug cavity above and
below the portion which requires to be bored out.
Dated this 21st day of January 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 ascer-
tained in and by the following statement :-
We make the plug cavity of the cock. larger than usual and introduce between
the walls of the plug cavity and the plug a loose metallic liner which can be
replaced when necessary the inner surface of the liner has grooves surrounding the
water ways.
While the plug of the cock is in place we caulk into these grooves asbestos
coated with a suitable material so that it will cement itself when subjected to heat
as described in the Specifications of Letters Patent No. 4282 of 1883 and 674 of
1886, or the asbestos may be made into a suitable form and laid into the grooves
and the plug forced down upon it.
In either case if the cementing material is rubber it is vulcanized in place with a
plug in position.
The joint between the liner and the shell of the cock is made fluid tight either
by caulking such a material as asbestos into grooves preferably formed in the outer
surface or back of the liner or the packing material may be made into a suitable
form and laid into such grooves in this case however the grooves need not be
so deep.
We prefer this packing to be sufficiently yielding to adapt itself to any slight
inaccuracy of fit.
A suitable stop is provided to prevent the liner turning and the cover is arranged

page_text: to press upon packing at the top of the liner in such a way as to keep it in
place.
Instead of the liner formed in one piece of metal we may employ a liner made in
one or two segments containing the packing that surrounds the water way.
These segments are by preference prevented from turning by suitable ribs or
projections in the plug cavity above and below the portion which requires t. be
bored out.
In the accompanying drawings-
Fig. 1. represents a sectional elevation of a cock constructed according to our
invention and
Fig. 2 a sectional plan.
Fig. 3. a section of the liner taken through the line, a.
Fig. 4 an outside elevation of the same.
In these views
a is the shell of the cock.
, the interchangeable liner.
, the plug.
d, the gland.
e, e, the vulcanized packing upon which the plug rests.
ff, the packing which makes the joint between the liner and the shell.
In these drawings this latter packing is shewn in the position in which we prefer
to use it in grooves on the outer surface or back of the liner.
the stop that prevents the liner turning.
h, is the cover.
Fig. 5 is a sectional plan of a liner and plug in which the packing e, e, and f, fis
caulked in.
Fig. 6 is a sectional plan of a liner and plug in which the packing e, e & f, is
laid in.
The liner in this case being thinner than in Fig. 5. because the packing
grooves do not require to be so deep.
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 an interchangeable metallic liner is employed which is made fluid tight against
the plug by cemented asbestos packing in grooves surrounding the water way and
is made fluid tight between the liner and the shell by packing also surrounding the
water-way.
Dated this 20th day of October 1892.
JOHN DEWRANCE.
GEORGE HENRY WALL.