IMPROVEMENTS IN KEELS, STEMS, STERN POSTS, AND SCREW FRAMES FOR SHIPS AND NAVIGABLE VESSELS."
Year: 1881

page_text: LETTERS PATENT to William Cooke and Daniel Mylchreest, of Liverpool, in
the County of Lancaster, Marine Engineers, and Naval Architects, for an
Invention of "IMPROVEMENTS IN KEELS, STEMS, STERN POSTS, AND SCREW
FRAMES FOR SHIPS AND NAVIGABLE VESSELS."
PROVISIONAL SPECIFICATION left by the said William Cooke and Daniel
Mylchreest at the Office of the Commissioners of Patents on the 3rd November
1881.
WILLIAM COOKE and DANIEL MYLCHREEST, of Liverpool, in the County of
Lancaster, Marine Engineers and Naval Architects. "IMPROVEMENTS IN KEELS,
STEMS, STERN POSTS, AND SCREW FRAMES FOR SHIPS AND NAVIGABLE VESSELS."
With the object of providing keels, stems, stern posts, and screw frames of
suitable and fitting metal at low first cost, we cast these or any of them of steel,
and by preference of mild steel.
The parts (or part) are cast in suitable moulds of the desired form, and in most
instances, but not necessarily, annealed, or they are cast in moulds near to the
desired form, and are subsequently heated, smithed, and tooled.
In the case of long keels it would be necessary to cast in sections with scarf or
other joints. In screw frames the saving in cost would be very great, care being
taken that the particles of metal were not in strain at any one or more points.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Cooke and Daniel Mylchreest in the Great Seal Patent
Office on the 3rd May 1882.
16
WILLIAM COOKE and DANIEL MYLCHREEST, of Liverpool, in the County of
Lancaster, Marine Engineers and Naval Architects. IMPROVEMENTS IN KEELS,
STEMS, STERN POSTS, AND SCREW FRAMES FOR SHIPS AND NAVIGABLE VESSELS."
"
With the object of providing keels, stems, stern posts, and screw frames of
suitable and fitting metal at low first cost, we cast these or any of them of steel,
and by preference of mild steel.
The part (or parts) are cast in suitable moulds of the desired form, and in most
instanc es, but not necessarily, annealed; or they are cast in moulds near to the
desired form, and are subsequently heated, smithed, and tooled.
In the case of long keels it would be necessary to cast in sections with scarf or
other joints. In screw frames the saving in cost would be very great, care being
taken that the particles of metal were not in strain at any one or more points.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a plan; Fig. 2, a side elevation; Figs. 3 and 4 transverse sections at the
lines A, A, and B, B, respectively, all of a bar keel in lengths, cast in steel under
our Invention. Each length has a web, flanges, and brackets in one piece, and the
lengths are connected or united by scarf joints; Fig. 5 is a horizontal section
through the keel at the scarf joint; a, keel; b, vertical web; c, top flange; d, bottom
flange; e, brackets to which the floors, frames, and reverse frames are attached ;
f, limber holes left in casting; g, rivets by which the lengths are connected together
at the scarf joint; h, are reverse frames.
Keels constructed as above described, and keels, keelsons, and stringers, con-
structed as hereinafter set forth, may be made in one or more lengths; when more
than one length is used they are connected or united by scarf or other suitable
joints; keels, keelsons, and stringers cast in steel under our Invention may be
annealed, smithed, or tooled in any desired manner.
Fig. 6 is a plan; Fig. 7, a side elevation; and Figs. 8 and 9, transverse sections
at the lines C, C, and D, D, respectively, of a steel plate keel or keelson constructed
in accordance with our Invention. The plate keel i, vertical web b, flange c, and
brackets e are all cast in one piece; g, rivets connecting or uniting the lengths of the
keel together at the lap joint; limber holes.
It will be evident that the keels or keelsons above described may be cast with
brackets of various shapes, or that they may be cast without brackets.
Fig. 10 is a transverse section and Fig. 11 a perspective view of a steel casting
applicable as a keel, keelson, or stringer, and is mainly intended for use in ships of
war; a, main vertical web; j, rider web; c, top flange; k, middle flange; d, bottom
fange; e, bracket attachments. The flanges may be more or less than three in
number, and may be cast on one side only of the web b.
Fig. 12 is a transverse section and Fig. 13 a perspective view of a steel casting
under our Invention, where is a horizontal web; m, double vertical flange;
n, single vertical flange; e, brackets.
Fig. 14 is a transverse section and Fig. 15 a perspective view inverted of a
casting in one piece of steel, suitable amongst other purposes for keels, keelsons,
and engine keelsons. The body of the casting consists of a web o forming three
sides of a rectangle; d, bottom flanges; e, stiffening brackets. The body of the
casting may be U shaped instead of rectangular, and the lower edge of the stiffening
brackets may be cast with flanges, lugs, or other pieces.
Fig. 16 is a transverse section of a casting similar to that described under
Figs. 14 and 15, in which there are top flanges c in addition to bottom flanges d.
Figs. 17 and 18 are perspective views of stems cast in one piece of steel under
our Invention, and respectively suitable for ships or navigable vessels having bar

page_text: or plate keels. The said stems may be cast in one piece with the keels, or may be
connected or united thereto by means of scarf or other joints; p, central web
forming the stem proper; q, flanges to which the framework and plates are
secured.
Fig. 19 is a perspective view and Fig. 20 a horizontal section to an enlarged
scale at the line E, E, of a cast, steel stem suitable for an armour plated ram or
man of war; p, central web or stem proper corresponding to the main keel or
keelson, attachments for stringers; a greater or less number of stringer
attachments than the four- sets, shown may be cast with the stem to suit
requirements. The central web or stem proper p is so shaped, grooved, or rabbeted
at 8 as to permit of armour plates and backing t being securely attached thereto. A
stem of the above class may be cast in two or more pieces and connected by scarf
or other joints.
Fig. 21 is a perspective view of a stem suitable for large merchant vessels
and war vessels not intended for ramming; p, central web or stem; r, stringer
attachments.
Fig. 22 is a perspective view of a cast steel stern post under our Invention
suitable for a sailing ship or for a steamship not having a propeller at the centre of
the stern; a, keel; u, stern post; v, flanges to which the frames or plates are
secured; w, bosses to which the rudder is connected.
Fig. 23 is a side elevation of a screw propeller frame cast in one piece of steel;
a, keel; x, rudder post; 3, screw post with boss; 2, gusset or strengthening pieces
to relieve the metal from strain at any one point and throughout.
Fig. 24 is a side elevation of the lower portion of a screw frame, similar to the
one described under Fig. 23, with the exception that the keel of the ship or vessel
is rivetted or otherwise secured to the screw frame instead of the said fraine being
cast with a portion of keel. The object here is to facilitate transport; 2, gusset
or strengthening piece.
Fig. 25 is a perspective view of a steel screw frame with a plate keel cast in one
piece under our Invention; x, rudder post; w, rudder bosses; 3, screw post, the
central web of which extends to and is connected with the main keel; s, gusset or
strengthening pieces; 1, flanges to which transoms are attached; v, flanges to which
frames and plates are secured. In this modification the rudder case may be cast
as part of the screw frame.
In all the above views like letters denote like parts.
It will be obvious that as mentioned steel keels or keelsons, stems, stern
posts, and screw frames may be cast under our Invention in many forins other than
those shown.
Having now described and particularized our said Invention in such manner that
others will be enabled to carry our improvements into effect, we claim,
Casting the parts of ships and navigable vessels herein described in the desired
forms of steel, all substantially in the manner set forth.
In witness whereof, we, the said William Cooke and Daniel Mylchreest,
have hereunto set our hands and seals, this First day of May, in the year
of our Lord One thousand eight hundred and eighty two.
JAMES JOHNSON,
Patent Office,
4, Clayton Sq³.,
Liverpool.
Witness.
WILLIAM COOKE.
(L.S.)
DANIEL MYLCHREEST. (L.S.)