Year: 1888

page_text: Date of Application, 14th Apr., 1888
Complete Specification Left, 12th Jan., 1889
Complete Specification Accepted, 23rd Feb., 1889
I, JOHN WILLIAM SMITH, of No. 10, Otterburn Terrace, Jesmond, Newcastle on
Tyne, in the County of Northumberland, Engineer, do hereby declare the nature of
this invention to be as follows :-
This invention has reference to the use with distributing valves of means for
automatically admitting air direct or through the steam chest of the cylinder for the
purpose of maintaining in an automatic manner a pressure which, when steam is shut
off, shall be equal, or approximately so, to that of the external atmosphere without
undue cooling of the steam chest or cylinder, for which purpose I provide in connection
with the inlet to the steam chest or cylinder, a conduit or conduits applied and
arranged in such a manner that before entering the steam chest or cylinder the air, on
its way thereto, has its temperature raised by passing through the blast pipe or in
some other convenient way.
This invention may be applied in conjunction with distributing valves of different
kinds and may be used in engines constructed in accordance with the specification o
another application of mine for Letters Patent bearing even date herewith.
Also my invention can with advantage be applied in compound locomotive engines.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: Improvements in Locomotive Engines.
I, JOHN WILLIAM SMITH, of No. 10 Otterburn Terrace, Jesmond, Newcastle.on
Tyne, in the County of Northumberland, 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:-
This invention has reference to the use with distributing valves of moans for
automatically admitting air direct or through the steam chest of the cylinder for the
purpose of maintaining in an automatic manner a pressure which when steam is shut off
shall be equal or approximately so, to that of the external atmosphere without undue
cooling of the steam chest or cylinder for which purpose I provide in connection with
the inlet to the steam chest or cylinder a conduit or conduits applied and arranged in
such a manner that before entering the steam chest or cylinder the air on its way
thereto has its temperature raised by passing through the blast pipe or in some other
convenient way.
This invention may be applied in conjunction with distributing valves of different
kinds.
Referring to the accompanying sheet of drawings
Fig. 1 is a vertical transverse section through a valve according to this invention
designed to supply heated air from the blast or other heated pipe to the steam chest of
a locomotive when running with the regulator closed.
Fig. 2 is a vertical section through the centre line 1-2 (Fig. 3) of the blast pipe
of a locomotive; Figs. 3 and 4 are transverse and horizontal sections through one
cylinder and the steam chest, of a locomotive having piston distributing valves
and fitted with means for the inlet of heated air to the steain chest according to my
invention. In these figures the same letters of reference denote like parts to those
similarly lettered in Fig. 1.
A is the steam chest, B. B the distributing valves, C the casing of the air inlet
valve D, and E the exhaust pipe. The valve D is subject on its back to the pressure
in the steam chest, and on its other side to the pressuro in the blast pipe. If found
necessary a small spring F may be employed to keep the valve up to its seat when
there is an equilibrium of pressure on its two sides. As long, however, as the
regulator of the engine is open there is steam pressure on the back of D and it
is kept closed. But when the regulator is shut and the engine continues to run from
its impetus, or under the action of gravity, then a partial vacuum is quickly produced
in the steam chest, and the valve D opens and restores the atmospheric pressure
allowing air to be drawn into the steam chest through the blast pipe E to which
the casing of the valve D is applied, or through some other pipe exposed to the heat
of the smoke box and communicating with the external air. At each stroke of the
piston heated air is drawn into the cylinder, and thus the difficulties resulting from
the formation of a partial vacuum in the cylinder, and from the cooling action of
non-heated air are avoided.

page_text: I am aware that previous to .my invention it has been proposed to admit cold air
to the steam chests or cylinders of a locomotive for the purpose of preventing the
formation of a vacuum in the steam chest when the engine is running with the steam
cut off, and that arrangements for the purpose have been described in the provisional
specification filed by W. Cowan No. 1960 dated 29 June 1869 and in the complete
specification filed by J. H. Johnson No. 1237 dated 7th March 1883.
Having now particularly described and ascertained the nature of my invention
and in what manner the same is to be performed I declare that what I
claim is
Admitting automatically to the steam chest of a locomotive which is running with
the steam cut off, air heated by being passed through a heated conduit or conduits the
arrangement being such that the pressure in the steam chest or in the cylinder is
not permitted to fall appreciably below the atmospheric pressure, substantially as
described.
Dated this 10th day of January 1889.
J. W. SMITH.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.