Improvements in Apparatus for use in Heating Railway Carriages.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for use in Heating Railway Carriages.
I, DUGALD DRUMMOND, of South Bank Lodge, Surbiton, in the County of
Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
:—
Hitherto in heating railway carriages by means of steam piping, the steam
supply has either been obtained from the locomotive boiler at high pressure or
from the exhaust steam from the cylinder at low pressure. With the high
pressure system risk of injury to passengers is incurred in the event of leaky
or defective fittings in the passenger compartments of the carriages. This risk
is reduced to the minimum by the use of exhaust steam by my invention.
Steam from the boiler is only used after the air has been exhausted from the
lieating pipes by means of an ejector, or by an arrangement connected to the
vacuum brake pipe. So soon as the air is exhausted from the heating pipes
the steam at low pressure from the boiler is admitted until the engine is put
in motion when the steam from the boiler is shut off and the exhaust steam
is brought into operation to make good the loss of heat by radiation in the
carriage compartments of the train. A check valve is placed in the exhaust
steam pipe of the engine to prevent the steam from being drawn back to the
smoke box where a vacuum is created on each pulsation of the engine, and
thereby forcing the exhaust steam through the heating pipes of the train. In
the chamber of the check valve there is fitted a steam nozzle connected to the
steam boiler connection to heat the compartments of the train before the
passengers enter, and also keep the check valve tight to its face, preventing
the live steam from getting into the exhaust pipe in the smoke box of the
engine. This check valve is novel in its several parts. It is constructed with
a loose sleeve forming the valve seat or face, and can be easily removed for
refacing. Also the valve is connected to the door or cover of the clack box,
so that it can be easily taken down for repairs. This arrangement is a safe
and effective and economical means of heating carriages, by the use of waste
steam at low pressure.
D
11
101 1
1000
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents. 62. Saint Vincent Street, Glasgow,
Agent for the Applicant.
Improvements in Apparatus for use in Heating Railway Carriages.
I, DUGALD DRUMMOND, of South Bank Lodge, Surbiton, in the County of
Surrey. Engineer, do hereby declare the nature of this invention and in what
[Price 8d.1

page_text: manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
1
Hitherto in heating railway carriages by means of steam piping, the steam
supply has either been obtained from the locomotive boiler at high pressure or
from the exhaust steam from the cylinder at low pressure. With the high
pressure system risk of injury to passengers is incurred in the event of leaky
or defective fittings in the passenger compartments of the carriages. This risk
is reduced to the minimum by the use of exhaust steam by my invention.
Steam from the boiler is only used after the air has been exhausted from the
heating pipes by means of an ejector, or by an arrangement connected to the
vacuum brake pipe. So soon as the air is exhausted from the heating pipes
the steam at low pressure from the boiler is admitted until the engine is put
in motion when the steam from the boiler is shut off and the exhaust steam
is brought into operation to make good the loss of heat by radiation in the
carriage compartments of the train.
1
The invention is illustrated by the accompanying drawings, Figure 1 being
a vertical longitudinal section through the exhaust pipe leading to the carriage
compartments, Figure 2 is a transverse section, and Figure 3 is a part plan
and part horizontal section of the same.
A check valve A is placed in a chamber A¹ situated on the exhaust steam
pipe B of the engine to prevent the steam from being drawn back to the smoke
box where a vacuum is created on each pulsation of the engine, and thereby
forcing the exhaust steam through the heating pipes C of the train. In the
chamber A¹ of the check valve A there is fitted a steam nozzle D connected to
the steam boiler connection to heat the compartments of the train before the
passengers enter, and also keep the check valve A tight to its face A², pre-
venting the live steam from geting into the exhaust pipe B in the smoke box
of the engine. The live steam is then shut off from the nozzle or injector,
and the exhaust steam passes through by way of the check valve A to the pipe
leading to the compartments. This check valve A is novel in its several parts.
It is constructed with a loose sleeve forming the valve seat or face A², and
which sleeve can be easily removed for refacing. Also the valve A is connected
to the door or chrer A³ of the clack box or chamber A¹, so that it can be
easily taken down for repairs. This arrangement is a safe and effective and
economical means of heating carriages, by use of waste steam at low pressure.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The improved apparatus for use in heating railway carriages by means
of which either boiler steam or exhaust may be employed, substantially as
described.
2. In apparatus for heating railway carriages, the arrangement in the exhaust
pipe of the engine of a steam nozzle or ejector and a check valve, substantially
as and for the purpose set forth.
3. In apparatus for heating railway
exhaust pipe fitted with a check valve
substantially as described.
!
carriages, a valve chamber in the
constructed and arranged to operate
WALLACE FAIRWEATHER.
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow,
Agent for the Applicant.