IMPROVEMENTS IN THE CONSTRUCTION OF COCKS AND SUCH LIKE ARTICLES
Year: 1853

page_text: 17th August 1853.-A communication.
(Void by reason of notice to proceed not having been given within the
time prescribed by the Act.)
I, SAMUEL PERKES, Civil Engineer, 1, Wallbrook, City, London, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF COCKS AND SUCH LIKE ARTICLES" to be as follows:-
Fig. 1, is a side view of a stop cock of one description constructed
according to this Invention. Fig. 2, is a longitudinal section of the
same thro' the centre. Fig. 3, is a plan of the same. Similar letters
of reference indicate corresponding parts in each of the Figures.)
This description of valve cock possesses advantage over the ordinary
plug cock in its lightness, and the facility with which the valve is
ground tight, but as the common valve cock is at present constructed,
it is practically very imperfect, as it is usual to make the screw by
which the valve is opened and closed on the valve stem, and unless
every part is very truly constructed, this will cause one side of the
valve to close or bear in its seat harder than the other parts, which will
.

page_text: be liable to bend the stem, and this difficulty is attended with worse
consequences when the valve has a broad bearing, as it is not so easily
closed all round, and hence it has been customary to make it with a
narrow seat.
The object of this Invention is to construct the cock in such a way
that the valve will always close truly, and thus allow it to be made
with a bearing of such a width as will enable it to be kept as tight as
the best plug cock.
The nature of this Invontion consists in making the valve with a
cylindrical stem passing through a hollow stem, which is attached
rigidly to or forms part of the body of the cock, and is furnished
outside with a screw, to which is fitted a nut with a yoke in which
the valve stem is capable of turning freely, but not of turning longitu-
dinally. By turning the nut this valve is raised and lowered from and
to its seat in a right line, the valve being always kept in such a posi-
tion that it will fall truly into its scat and close tightly.
To enable those skilled in the art to make and use this Inven-
tion I will proceed to describe its construction and operation. A,
is the body of the cock, and B, the valve seat, which do not differ
materially from other valve cocks. C, is the hollow fixed stem,
which in the cock shewn is screwed into the body; it is furnished
at its upper part with an external screw a; it is provided with a
stuffing box b, and a gland c, for the purpose of packing the valve
stem. D, is the valve, and d, its stem, which is furnished at its top
with a screw e, and a little below the screw with a collar f. E, is
the nut by which the valve is opened and closed; it is fitted to the
screw a, on the hollow fixed stem C, and is provided with a wheel or
lever, by which it is furnished above with a yoke g, which fits easily to
the valve stem by a nut n, fitting to the screw e; this nut fits down to
a shoulder so that it does not bite the yoke, but simply prevents a
longitudinal motion of the valve stem and nut independently of each
other, not preventing the turning of the nut; the valve is raised and
lowered by turning the nut wheel E; the valve stem is squared at the
top to receive a wrench for grinding the valve. The valve of a cock
of large size constructed in this manner may be ground in a few

page_text: minutes, whereas a 3-inch plug cock will commonly take 5 or 6, and
sometimes 10 hours to grind it tight whenever it leaks. In cocks of
large size the body A, may be made of cast iron, and the seat B, and the
stem C, of brass, which construction will reduce the expence.
The principle of this Invention is applicable to cocks of almost every
description.
What I claim in this Invention, and desire to secure by Letters
Patent, is, the principle of construction above mentioned, together with
the combination of the screw a, on the hollow fixed stem C, the
nut E, and the valve stem d, substantially in the manner and for the
purpose herein described. I do not confine myself to the description
of metal or metals used in their construction, but also claim the use of
any suitable description of metal or metals, and construct cocks on
this principle either with flanged ends, screwed coupling nuts, or other-
wise as may be required; and also claim for the principle of con-
struction contained in this Invention to every description of cock, and
for all such like purposes, wherever it is or may be found applicable.