Improvements in the Construction of Side Interoostal Stringers in the Holds of Ships.
Year: 1892

page_text: Date of Application, 1st Dec., 1892
Complete Specification Left, 5th June, 1893-Accepted, 29th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Side Interoostal Stringers in
the Holds of Ships.
I GEORGE WILLIAM SIVEWRIGHT of 5 Radcliffe Terrace Hartlepool in the
County of Durham Shipbuilder do hereby declare the nature of this invention to
be as follows:-
My invention relates to side intercostal stringers in ships and has for its object
an improved construction of stringer whereby the weight of material for equal strength
is less and the cost of manufacture is less than the methods of construction now in
USC. It has been the practice hitherto with these intercostal stringers in holds
of ships which are formed of longitudinal horizontal or diagonal plates to attach
the outer edges of such plates to the shell plating of the ship and also to connect
them to the main angle frames of ship by horizontal angle plates or plate. In
carrying out my invention I dispense with the horizontal angle plates or plate in
way of the shell plating and main angle framing of ship and make the longitudinal
horizontal or diagonal intercostal stringer of zed design so that I can connect it to
the shell and main angle framing of ship without the aid of horizontal angle platės
and can fit it in such a manner that the stringer is stronger, lighter and cheaper to
manufacture than the arrangement where attached horizontal angle plates are
employed as a connection to the shell plating and main angle frames of ship.
Dated this 30th day of November 1892.
GEORGE WILLIAM SIVEWRIGHT.
COMPLETE SPECIFICATION.
Improvements in the Construction of Side Intercostal Stringers in
the Holds of Ships.
I, GEORGE WILLIAM SIVEWRIGHT, of 5, Radcliffe Terrace, Hartlepool in
the County of Durham, Shipbuilder, 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:-
My invention relates to side intercostal stringers and has special reference to the
mode of connecting them to the main angle frames of the ship.
It has been the practice hitherto with these intercostal stringers in the holds of
ships which are formed of longitudinal, horizontal or diagonal plates in addition to
attaching the outer edges of such plates to the shell plating of the ship to also
similarly connect them to the main angle frames of the ship by a horizontal angle
bar or bars rivetted thereto and where the inner edge is not stiffened by flanging
the plate in the manner described in my Specification No. 18502 of 1892, angle
iron stiffeners are used for this purpose, the stringer thus consisting of a flat plate
fitted in positions by angle bar connections.
In carrying out my invention I construct the longitudinal horizontal or diagonal
intercostal stringer of such a design in sectional area that I can connect it to the
shell and main angle framing of the ship without the aid of horizontal angle bar
connections and by flanging its inner edge I dispense with angle bar connections
altogether, and fit the said stringer in such a manner that the stringer is stronger,
lighter, and cheaper to manufacture than when horizontal angle bars are employed
to provide the requisite connections with the shell plating and main angle frames of
the ship. In order to fully explain my said improvements I have illustrated in

page_text: Figure 1 of the accompanying drawing a transverse sectional view of the side inter-
costal stringer a secured to the ship's shell by the angle bar band to the main angle
frame by the angle bar 1, the inner edge being stiffened by the angle bars 13
from which it will be observed that the requisite angle bar connections of the
stringer to fit it in position involve five rows of rivets exclusive of the rivets
required to rivet it to the web frame cover or diamond plates. By my improve-
ment as illustrated by a similar transverse sectional view in Figure 2 it will be
observed that I have dispensed with angle connections altogether, that is to say
that I flange the outer edge a¹ of the stringer plate a in substitution of the
angle bar and rivet the said flange to ships shell. I also step down the stringer
at a² in the manner shown in Figure 2 to effect a surface contact with the main
angle frame c in substitution of the angle bar in Figure 1. The inner edge of
the stringer plate I preferably flange downwards at a³, in substitution of the angle
iron stiffeners 2 and 3 and thus combine the improvements described in my Speci-
fication No. 18502 of 1892 with the improvements constituting this invention, the
stringer taking the form in section shown in Figure 2 in which all angle bar con-
nections and the rows of rivets by which they are attached to the stringer plate a
are dispensed with.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
11
In the construction and mode of fixing hold stringers in ships' holds, the use of a
plate the outer edge of which is flanged up to the ships shell combined with a step
down in the stringer plate to bring the plate itself into surface contact with the main
angle frame, with or without a flanged inner edge in substitution of angle bar
stiffeners, all combined and fixed together, substantially as hereinbefore described
with reference to the accompanying drawing.
Dated this 2nd day of June 1802
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicant.