Improvements in Cylinders for Marine and other Engines.
Year: 1889

page_text: Date of Application, 9th Apr., 1889
Specification Accepted, 11th May, 1889
COMPLETE SPECIFICATION.
Improvements in Cylinders for Marine and other Engines.
1. WILLIAM HENRY NORTHCOTT of 7, St. Mary's Road, Peckham, in the county
of Surrey, 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 my invention is to reduce the weight of Marine and other Engine
Cylinders by so building them up that steel or other material stronger than cast iron
may be substituted wholly or partly for cast iron in the construction of such cylinders.
Fig. 1. is a sectional elevation of such a cylinder, Fig. 2. a sectional plan of the port
frame & Fig. 3. a side elevation of the port frame Fig. 4. shews another method of
constructing the port frames.
I prefer to make the barrel A. of the cylinder of wrought steel but wrought iron may
be employed, or the barrels may be steel or phospor bronze castings. The flanges may
he wrought or cast solid with the barrel or they may be riveted on.
I prefer to make the port frames B. B' as steel castings or to build them up of steel
plates, the flanges in the latter case being either welded up or riveted. But these frames
may be cast in bronze or cast iron. The flat walls of the ports are stayed to suit the
steam pressure. I prefer to make the cylinder covers of wrought steel plates suitably
curved or coned to withstand the pressure as shewn. When a stuffing box is required I
bolt it on as shewn at E. and when no gland is required I fix a hand-hole cover
instead. The valve covers F. F. may be formed in the same manner. The several
parts CD & D of the valve casing may be made of wrought steel with flanges and
branches welded solid as shewn or these flanges and branches may be riveted on. Or
the parts C. D & D' may be castings. By making the port frames of suitable shape
two piston valves may be used as is often necessary with large cylinders. Or a flat
slide valve may be used instead of a piston valve.
I prefer to support the cylinder on a central column of wrought or cast steel
forming also the crosshead guides. Such column may be either round or rectangular
in cross section but to prevent spring' I stay the column to the lower cylinder

page_text: cover by gusset or other stays as shewn at G! G.. Instead of supporting the cylinder
on a central column the port frame B¹ may be extended beyond the cylinder cover
to rest on and be carried by the usual standards or pillars.
The cylinder will of course be cleated in the ordinary manner.
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
claim is
1. The method of building up Cylinders for Marine and other Engines substantially
as and for the purpose described.
2. In built up Engine Cylinders the use of wrought steel, cast steel, phospor
bronze or wrought iron for the barrels of such cylinders.
3. The use of wrought steel, wrought iron or wrought bronze cylinder covers and
valve chest covers substantially as described.
'
4. The method of supporting and staying cylinders substantially as hereinbefore
described.
Dated this 9th day of April 1889.
WILLIAM HENRY NORTHCOTT.