improvements incomo
Year: 1899

page_text: Date of Application, 3rd May, 1899
Complete Specification Left, 3rd Mar., 1900-Accepted, 3rd May, 1900
improvements incomo
I, WILLIAM ROBERT RENSHAW, of 47, Victoria Street, Westminster, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention
to be
as follows:
The object of this invention is to obtain greater cylinder capacity and more
equal strains. For this purpose the cylinders instead of being placed side by
side are arranged one helind the other, overlapping but not in a line with each
other.
For compound engines this arrangement is adopted for the lower pressure
cylinders. In compounding existing engines the outside cylinders are retained
as the high pressure cylinders but for new compound engines I prefer to arrange
the high and low pressure cylinder of each engine tandem the high pressure
cylinder of one engine being alongside of the low pressure cylinder of the other.
I cast the four cylinders together by preference, forming an intermediate
receiver round them, the exhaust from the high pressure cylinders opening direct
into this receiver which also forms a steam jacket.
This receiver or jacket is also connected with the boiler by a self acting reducing
valve, and a suitable steam trap being provided is always charged with dry steam
whenever steam is up. I arrange the valves by preference on the top and the
same eccentric or other valve gear is common to both high and low pressure
cylinders, suitable stuffing boxes being provided between high and low pressure
valve boxes and cylinders.
The piston rods, connecting rods, and cranks are common to both engines so
that there are only the same number of moving parts outside the cylinders as
for ordinary high pressure engines.
I also connect the intermediate receiver to the boiler by a separate pipe con-
trolled by a valve, so that in starting with heavy loads or to attain full speed
quickly, full boiler pressure can be admitted to the low pressure pistons, thus
nearly doubling the hauling power.
1000
W. R. RENSHAW.
COMPLETE SPECIFICATION.
Improvements in Locomotive or Traction Engines.
I, WILLIAM ROBERT RENSHAW, of 47, Victoria Street, Westminster, 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:--
The object of this invention is to obtain greater cylinder capacity and more
equal strains. For this purpose the cylinders instead of being placed side by
side are arranged one behind the other, overlapping but not in a line with each
other.
aubatsiaturant is odanted for the law urziscuta and

page_text: In compounding existing engines the outside cylinders are retained as the high
pressure cylinders but for new compound engines I prefer to arrange the high
and low pressuré cylinder of each engine tandem the high pressure cylinder of
one engine being alongside of the low pressure cylinder of the other.
I cast the four cylinders together by preference, forming an intermediate re-
ceiver round them; the exhaust from the high pressure cylinders opening direct
into this receiver which also forms a steam jacket.
This receiver or jacket is also connected with the boiler by a self-acting re-
ducing valve, and a suitable steam trap being provided is always charged with
dry steam whenever steam is up. I arrange the valves by preference on the top
and the same eccentric or other valve gear is common to both high and low
pressure cylinders, suitable stuffing boxes being provided between high and low
pressure valve boxes and cylinders.
The piston rods, connecting rods, and cranks are common to both engines so
that there are only the same number of moving parts outside the cylinders as for
ordinary high pressure engines.
I also connect the intermediate receiver to the boiler by a separate pipe-con-
trolled by a valve, so that in starting with heavy loads or to attain full speed
quickly full boiler pressure can be admitted to the low pressure pistons, thus
nearly doubling the hauling power.
Figure 1 is a longitudinal section of a non-compound two cylinder engine
arranged in this way.
Figures 2 and 3 are longitudinal sections at right angles to each other of a
similar four cylinder compound engine. Figure 4 is a local section (to a larger
scale) on the line 4-4 Figure 2 showing the stuffing box, and Figure 5 is an end
view of the same.
Figure 6 is a transverse section on the line 6-6 Figure 2.
In Figure and are the cylinders, a¹ and the pistons in them, and a
and the piston rods. The cylinders are preferably made of a single casting
as shown, the piston rod working in a tube formed alongside the cylinder b.
In Figures 2 to 6a and bare the low pressure cylinders, a and b their pistons,
and a and b the piston rods. c and d are the high pressure cylinders.
Figures 4 and 5 show an arrangement for screwing down the covers f of the
stuffing boxes between the high and low pressure cylinders. The cover screws
into the box f¹ as shown and has a worm wheel formed around it gearing with
a worm g the spindle g of which projects to the outside of the cylinders.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
1. The combination of two cylinders, arranged one behind the other overlapping
but not in a line with each other.
2. The combination of two high pressure and two low pressure cylinders, the
low pressure cylinders being arranged one behind the other overlapping but not
in a line with each other, and with or without the combined jacket and receiver.
3. The combination of two high pressure and two low pressure cylinders, the
low pressure cylinders being arranged one behind the other overlapping but not
in a line with each other, and each high pressure cylinder being arranged tandem
with one of the low pressure cylinders and alongside the other, and with or with-
out the combined jacket and receiver.
4. Locomotive or traction engines substantially as described and illustrated
in the drawings.