A Combined Girder and Solid Bar Sternpost for Steamers and Sailing Vessels.
Year: 1887

page_text: Date of Application, 9th May, 1887.
Complete Left, 16th Aug., 1887.
Complete Accepted, 27th Sept., 1887.
PROVISIONAL SPECIFICATION.
A Combined Girder and Solid Bar Sternpost for Steamers and
Sailing Vessels.
JAMES HARPER LAIDMAN 18 East Parade, Holderness Road Hull, Yorkshire Head
Foreman Plater do hereby declare the nature of my invention for A COMBINED
GIRDER AND SOLID BAR STERNPOST, FOR STEAMERS AND SAILING VESSELS, to be
as follows:
The inner and outer Posts, to be constructed of Iron or Steel Bars, of various
sections, Rivetted together, such as ordinary Angle Bars, Tee Bars, Z shaped Bars,
Channel Bars, H section bars, Box Girders, or Flat Bars.
The bottom portion of Sternpost to be a Solid Forged Bar, or made of Cast Steel,
and connected to inner and outer Posts.
The Boss Tube to be formed of a Forged or Cast Steel Ring, connected to the inner
Post.
The above combination will save Material, lighten Labour, and facilitate Repairs
when necessary.
TIT:
M1007
'JAS. H. LAIDMAN.

page_text: WHA
Sailing Vessels.
I, JAMES HARPER LAIDMAN, 18 East Parade, Holderness Road, Hull, Yorkshire,
Head Foreman Plater; 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 :-
According to my invention, instead of making the sternposts for steamers and
sailing vessels entirely of solid forged bars as at present, I construct them of a com-
bination of solid bars and of profile bars of various sections in the following
manner: The inner and outer posts are constructed of iron or steel bars or plates
either malleable or cast, of various sections rivetted together in girder form, for
which purpose either ordinary angle bars, tee bars, Z section bars, channel bars,
H section bar, box girders or flat bars may be used.
The bottom portion of the stern post is made either of a solid forged iron bar, or of
a cast steel bar, and is connected to the inner and outer stern posts by fitting between
the flanges of the same, to which it is secured by rivets or screwstuds, or for lighter
constructions the said bottom portion may be of girder or box section.
The tube or eye of the inner stern post through which the propeller shaft passes is
constructed of a forged iron or cast steel ring which may be connected to the stern
post in either of the three following ways: first, by forming forged horizontal knees
on the separated upper and lower part of the post, between which the tube fits, and
which is secured thereto by rivets or screw studs; second, by dividing the continuous
stern post bars vertically in a plane corresponding to the longitudinal axis of the
vessel, and fitting the tube between the separated parts of the post, which con-
sequently surround the tube, and are provided with reverse angle rings inside, secured
to the tube by rivets or screw studs, and third, by forging or casting vertical webs
on the upper and lower sides of the tube, to which the inner post bars are secured
by rivets or screw studs.
The rudder gudgeons and rudder stops are either of forged iron or cast steel
fitting between the flanges of the outer post to which they are secured by rivets or
screw studs.
The accompanying drawings shew stern posts constructed according to my above
described invention. Fig. 1 shews a side elevation and Figs. 2 to 10 shew cross
sections taken respectively on the lines 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8,
9-9, 10-10; Fig. 11 shews a front view of part of the inner stern post with the
shaft tube secured thereto, and Fig. 12 shews a sectional plan of the lower part of
the post. The inner and outer stern posts are in this case shewn constructed of
two channel irons A B, C B, rivetted together back to back, the iron B, which forms
part of both, being made as a continuous loop within which the propeller is situated,
while the iron A is carried round the underside of this loop to the iron C, which
on the other hand is carried round the top of the loop B to the iron A.

page_text: The flanges of the part of B forming the outer post are strengthened by a channel iron
fitting piece D and at the lower part of the loop the flanges are made to die away so
that at bottom B forms simply a flat plate as shown at the section Fig. 6. Between
the flanges of the upright part of the bar A are fixed blocks E E carrying the rudder
gudgeons and stops, and between those of its bottom portion is fixed the solid forged
iron or cast steel bar F of varying sections as shewn at Figs. 5, 6, 7 and 8 being
tapered off in thickness towards the inner end where it is secured to the stern framing
of the vessel as shewn in the sectional plan at Fig. 12. At the front end it is formed
with a step G for the bottom gudgeon of the rudder.
The parts B and C of the inner stern post are divided at the point where the shaft
tube His fixed to them, and are there formed with forged knees B¹ and C¹ to which
the tube H is secured by rivets or screwed studs.
To the outer surfaces of the parts B and Care rivetted the plates I of the stern
frame of the vessel.
Figs. 13 and 14 shew respectively a vertical section and an end view of another
construction of the tube H in which this is formed with a fork at top and bottom into
which the upper and lower parts of the stern post fit and to which these are rivetted
as indicated.
When applying this construction of stern post to sailing vessels, it is formed of a
single post which may either be constructed as shewn in part elevation at Fig. 15 and
sections at Figs. 16 and 17 taken respectively on lines 16-16, 17-17, the post being
formed of a single channel iron A with a solid forging or casting F rivetted thereto at
bottom, or it may be constructed as shewn in part elevation at Fig. 18 and sections 19
and 20, taken on lines 19-19 and 20-20, the post being in this case formed of two
channel irons A A rivetted back to back.
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 I claim is :—
1. Constructing stern posts for steamers and sailing vessels of a combination of
solid bars and profile bars rivetted together so as to form a girder section substantially
as herein described.
2. Constructing stern posts for steamers of an inner and outer post formed of
profile bars rivetted together to form a girder section, the bottom part of the stern
post being formed of a solid forged iron or cast steel bar secured to the posts by
rivetting or screw studs substantially as herein described.
3. Securing the shaft tube to the inner post of stern posts such as are referred to in
the preceding claim substantially in the manner herein described.
Dated this 30th day of July 1887
ABEL & IMRAY,
Agents for the Applicant.