Improvements in Locomotive Engines.
Year: 1892

page_text: Date of Application, 11th July, 1892-Accepted, 20th Aug., 1892
Improvements in Locomotive Engines.
I JOSEPH BURDETT of 132 Latimer Road, Notting Hill in the County of
Middlesex, 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 relates to locomotive engines whether for use on railways or
tramways, and to traction engines, and the object of the invention is to apply
the compound principle of driving, that is, by four cylinders, two high, and two
low pressure to one pair of driving wheels.
This is effected first by placing two further cylinders immediately in front of the
cylinders of the ordinary two cylinder locomotive and extending the piston rods
through the cylinder ends of the latter so that each pair of high or low pressure
cylinder pistons works one piston rod coupled to the crank axle of the driving
wheels in the case of inside cylinder engines, and to the crank pin of the driving
wheels in the case of outside cylinder engines by the ordinary crosshead and
connecting rods. The invention is applicable to either inside or outside cylinder
engines with single pair of driving wheels two pair, three pair or any practical
number coupled, and is intended to work on the well known principle of compound
engines, the high and low pressure cylinders being placed so that either high or low
pressure is leading, or alternately high and low pressure, but preferably the high
and low pressure cylinders in pairs, the high pressure leading and the low pressure
behind or vice versa. The steam goes direct from the boiler to the high pressure
steam chest. The steam from the high pressure cylinder may be taken direct
into the low pressure cylinder or may be superheated before being passed into
the low pressure cylinder by any of the usual processes and afterwards exhausted
in the usual way. The valves for serving the cylinders with steam may be worked
by the ordinary link motion or by "Joy's" valve gear or a modification of the
same. One valve only is used for serving steam to each pair of cylinders, namely
one high pressure and one low pressure and may be arranged to work in the
high pressure steam chest, or two valves may be used where higher expansion is
required, or for other purposes of steam economy.
My improvements in the arrangement of compound locomotive engines for
railways, their cylinders, valves, pistons and connections are shown on the accom-
panying four sheets of drawings.
Fig. 1 is an elevation of this arrangement as applied to outside cylinder engines
with single or coupled driving wheels.
Fig. 2 shows in plan one half of the engine, the other part being symmetrical
therewith.
The cylinders A A' are arranged tandem, and their piston B is coupled direct
from the crosshead to the outside crank pin and to the inside cranked axle by
outside and inside connecting rods respectively; the valves are shewn driven direct
from the high pressure steam chest, by ordinary link motion, valve rod being
marked b.
Figures 3. 4 and 5 show my improved arrangement as applied to inside cylinder
engines commonly used as passenger type with four wheels coupled. In the
arrangement shown, the high pressure steam chests, are placed above the cylinders,
and the valves are proposed to be driven by "Joy's "radial valve gear, or they
may be driven by the ordinary link gear through a rocking shaft, the arrangement
of the cylinders being as before described, that is tandem. The high pressure
steam chests are fed direct from the boiler through the pipes marked cc cc in the
-

page_text: smoke box, the low pressure cylinders exhausting through pipe d d direct into
the air.
Fig. 6 shows my improved arrangement as applied to goods locomotives with
either six or eight or any practical number of wheels coupled; this is shown as a
diagram only but the arrangements in detail are simply modifications of the
arrangements substantially as herein before described in the preceeding sheets.
The remaining Figures 7 to 11 show my improved slide valves for serving high
and low pressure cylinders simultaneously with steam, by which arrangement a
second set of valves is obviated. Figs. 7 and 9 show a D pattern valve e with
passage n cast in same. This valve works over a port face a with five ports or
passages in same, two for the high pressure cylinder marked ff, two for the low
pressure cylinder marked yy and one for exhausting from low pressure cylinder
marked h, the action of the valve being that in admitting high pressure steam
through port to one end of the high pressure cylinder; communication is main-
tained to low pressure cylinder through the other port f, valve port n and port g,
the steam being exhausted through the other port g, and exhaust port / to
atmosphere. mm shows a balance ring inserted on the upper side of the valve to
relieve the same of pressure.
Fig. 10 shows my improved valve fitted with a cut off plate or valve p sliding
over the upper face of the same, this arrangement is necessary only when a high
degree of expansion of steam is requisite.
Figs. 11 and 12 show my improved form of piston valve; the action of this valve
is precisely similar to the D form previously described, but by reason of the same
being circular it is free from undue pressure and works in equilibrio.
Fig. 7 shows a distance plate for fixing between the high and low pressure
cylinders two passages g g being cored in same for transmitting steam from high
pressure cylinder to low pressure cylinder and vice versa.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I- declare that what I
claim is :
A tandem locomotive (railway, tramway or traction engine) having two pairs of
high and low pressure cylinders, served by two slide valves, one valve to each pair
of cylinders, combined, constructed, and actuated as shown, adapted to be reversed
and worked by one set of valve gear to each engine substantially as herein
described and illustrated.
והוו..
1 1000
Dated the I
1900
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.