Improvements in and relating to Ships' Rudders.
Year: 1893

page_text: Date of Application, 10th Oct., 1893
Complete Specification Left, 1st June, 1894-Accepted, 7th July, 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Ships' Rudders.
MALCOLM MCKINNON Iron Shipbuilder 2 Laird Street Port Glasgow
Renfrewshire Scotland, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object the shipping & unshipping of rudders without
the necessity of digging wells in dry docks or the removal & disturbance in any
way
way of any part of the gearing or fittings of ship's deck.
make the rudder in two parts one being the blade proper, which is hung to the
stern post in gudgeons in the ordinary manner, the other part is the stock which is
suspended through the trunk & geared with quadrant at top in the usual way.
The stock is forked at bottom end, with recess between the forks to receive the
top of rudder blade & which recess is sufficiently deep to contain also a flat tapered
key, broad or thick enough to be more than equal to the depth of the gudgeons of
rudder blade.
Holes are bored through rudder blade & corresponding ones through the stock
at the forked part & through the tapered key for receiving bolts. The key is
fitted between the top of blade & the recess of the stock & when driven home
& the bolts passed through and screwed up, the blade & stock are bound
substantially together.
To unship the rudder all that is necessary is to undo & remove the bolts &
drive out the key when the blade will be free to be lifted up out of the gudgeons
& from between the forks of the stock, without in any way interfering with the
gearing of the rudder or quadrant. If necessary the stock can be sustained in
position when the blade is withdrawn by tackle fastened to any suitable part with
eve bolts or otherwise, but in ordinary cases the quadrant alone will be found
amply sufficient for this purpose.
Dated this Seventh day of October 1893.
COMPLETE SPECIFICATION.
Improvements in and relating to Ships' Rudders.
I, MALCOLM MCKINNON, of 2 Laird Street, Port Glasgow, Renfrewshire,
Iron 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 :-
This invention relates to improvements in ships' rudders, and has for its object
the shipping and unshipping of the rudders without the necessity of digging wells
in dry dock or in the removal and disturbance in any way of any part of the
gearing or fitting on ships' decks.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended one sheet of drawing in the several figures of
which corresponding parts are marked with the same letters of reference.
Figure 1 is a front elevation showing my improvements.
Figure 2 is a similar view with the rudder in the act of being unshipped.

page_text: Figure 3 is a front view of the rudder-stock; and
Figure 4 is an end view of the same; while
Figure 5 is a separate view of the key.
In carrying my invention into practice I make the rudder in two parts, one
being the blade A which is hung to the sternpost B in gudgeons C in the ordinary
manner the other part is the stock D which is suspended through the trunk of the
vessel and geared with quadrant at top in the usual way.
The lower end of the stock D is forked, and into the recess or space E between
the two prongs E' the top portion of the rudder blade A sits, and it is secured to
the stock by means of bolts a. I also provide a key, wedge or slip F which fits in
between the top of blade A and the recess or space E in stock D, and it is fixed to
the stock by means of bolts.
When it is desired to unship the rudder, all that is required is to undo and remove
the bolts a and drive out the key, wedge or slip F, when the rudder blade A will
be free to be lifted out of the gudgeons C and from between the prongs E'
in the fork, without in any way interfering with the gearing of the rudder or
“quadrant.
If necessary the stock can be sustained in position when the blade is withdrawn
by tackle fastened to any suitable part with eyebolts or otherwise, but in ordinary
cases the quadrant above will be found quite sufficient for this purpose.
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 :-
Constructing a ship's rudder in two parts substantially in the manner and for
the purpose hereinbefore described and shown on the accompanying sheet of
drawings.
Dated this 31at day of Me 1904
+
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.