Improvements in Construction of Side Intercostal Stringers in Ships.
Year: 1892

page_text: Date of Application, 15th Oct., 1892
Complete Specification Left, 5th June, 1893-Accepted, 22nd July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Construction of Side Intercostal Stringers
in 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 by flanging portions thereof whereby the weight of
material for equal strength is less and the cost of manufacture is less than the
methods of construction now in use. Hitherto it has been the practice in these
stringers in the holds of ships which are formed by longitudinal horizontal or
diagonal plates to attach the outer edge of such plates to the shell of the ship by
means of angle plates or plate and to stiffen the horizontal plate at its inner edge by
riveting on one or more angles thereto. In carrying out my invention I dispense
with such angles and by making the horizontal plate wider and flanging its inner
edge in such a manner that the attachment of angles is unnecessary whereby the
structure is lighter, stronger and cheaper to manufacture than in the arrangement
where attached angles are employed on its inner edge.
G. W. SIVEWRIGHT.
COMPLETE SPECIFICATION.
Improvements in Construction of Side Intercostal Stringers
in 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 in ships.
Hitherto it has been the practice in these stringers in the holds of ships which
are formed by longitudinal, horizontal or diagonal plates, to attach the outer edge
of such plates to the shell of the ship by means of angle plates and to stiffen the
horizontal plate at its inner edge by rivetting an angle bar to one or both sides.
The object of my invention is to dispense with such angle bars along the inner
edge, and by making the horizontal plate wider and flanging its inner edge in such
a manner that the attachment of angles is unnecessary to obtain equal strength for
less weight of material and cost of manufacture.
A further object of my invention is to dispense with all flange projections or
cover plates extending upwards which are found to damage the cargo and more
especially a bag cargo, and which by forming pockets and receptacles afford a
lodgment for dirt and refuse, all of which disadvantages are obviated by my
improvements and the stringers are more easily cleaned in discharging cargo and
sluiced down. It is also found that by dispensing with flanges and cover plates
or diamond plates projecting upwards above the stringer plate a larger number
of bags of rice or other material requiring bags can be accomodated in the ships
hold.
I will now describe the construction and arrangement of parts constituting my
improvements in side intercostal stringers and for that purpose shall refer to the
accompanying drawing in which I have illustrated in Figures 1 and 2 the mode of

page_text: construction as hitherto practised and in Figures 3 and 4 the improved mode of
construction which constitutes my invention.
In Figures 1 and 2, it will be observed that the inner edge a, of the hold
stringer b is stiffened by rivetting thereto the angle bars el c² forming a flange
extending equally above and below the stringer plate b, it will be further observed
that at each intersection of the hold stringer and the web frames & a connection is
provided in the form of the diamond cover plate e, which also extends as far above
as below the hold stringer plate b. By my improvements as illustrated in Figures 3
and 4, I substitute for the angle irons c' c² the stiffening flange c³ extending down-
wards as part of the hold stringer plate and at the intersections of the hold
stringer and web frames I provide a cover plate e¹ in the form of a semi-diamond
or its equivalent extending downwards and rivetted to the flange c³.
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 :-
:-
:
Firstly In the construction and arrangement of hold intercostal stringers and
web frames of vessels constructed on the intercostal and web frame principle the
use of a flanged inner edge formed by making the stringer plate wider and flanging
its edge downwards in substitution for angle bars rivetted thereto substantially as
and for the purpose as herein before described.
Secondly-In the construction and arrangement of hold intercostal stringers
and web frames, the use of a semi-diamond cover plate or its equivalent in com-
bination with a flanged hold stringer, the flange of the hold stringer and the cover
plate both extending downwards as and for the purpose as hereinbefore described
and illustrated in Figures 3.and 4.
יהויד
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicant.