Improvements in Steering Machinery.
Year: 1893

page_text: Date of Application, 6th July, 1893
Complete Specification Left, 4th Apr., 1894-Accepted, 5th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in Steering Machinery.
I, ANDREW BETTS BROWN, of Rosebank Iron Works, Edinburgh, in the County
of Mid Lothian, North Britain, Engineer, do hereby declare the nature of this
invention to be as follows, that is to say :-
My said invention relates to steam steering machinery of the kind described in
my Patent Specification No. 10,132 of 1889, and which is now known as the
"Steam Tiller." The object of my present invention is to modify the machinery
in a manner to obtain an increased leverage for moving the rudder when it has to
be put "hard over" to either side.
Instead of the toothed rack which is fixed to the ship's deck and in which there
works a pinion or worm carried by the tiller, being arc-shaped and concentric with
the rudder head, I make the said toothed rack straight and at right angles to the
middle position of the rudder; or it may be curved or partly curved in a manner
to bave its ends further from the rudder head than its middle part.
The engine is carried on an after tiller or on an extension of the rudder head;
but instead of the engine framing or casing being fixed on such tiller as heretofore,
I have it fitted to slide thereon, and provided with a part guided on the rack bar
in a manner to keep the pinion always in gear with the rack teeth.
As the tiller moves to either side the engine with the pinion slides outwards on it
so that the leverage of the action increases.
Dated this Fifth day of July 1893.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Steering Machinery.
I, ANDREW BETTS BROWN, of Rosebank Iron Works, Edinburgh, in the County
of Mid Lothian, North Britain, Engineer, 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, that is to say :-
My said invention relates to steam steering machinery of the kind described in
my Patent Specification No. 10,132 of 1889, and which is now known as the
"Steam Tiller." The object of my present invention is to modify the machinery
in a manner to obtain an increased leverage for moving the rudder when it has to
be put "hard over to either side.
"
Instead of the toothed rack which is fixed to the deck and in which there works
a pinion or worm carried by the tiller being arc-shaped and concentric with the
rudder head, I make the said toothed rack straight and at right angles to the
middle position of the rudder; or it may be curved or partly curved in a manner
to have its ends further from the rudder head than its middle part.
And in order that my said invention and the manner of performing the same may
be properly understood I hereunto append a sheet of explanatory drawings to he
hereinafter referred to and representing "steam tiller" steering machinery as made
with my present improvements.
Figures, 1, and, 2, of the drawings are, respectively, a sectional plan and a

page_text: sectional elevation of the machinery. Parts of the machinery hereinafter referred
to or not are to be understood as being substantially the same as the corresponding
parts described in my Patent Specification No. 10,132 of 1889, bereinbefore
referred to, unless differences in construction, or arrangement are hereinafter
described and the same. reference letters and numerals are used in my present
and earlier Specifications to mark the same or like parts wherever they are
repeated.
The engine is carried on the after tiller, B, and is within a casing, D. (details
within the casing not being shown) but this casing instead of being fixed on the
tiller is movable along it, being made with bearing flanges, U, which slide on guide
flanges, U 1, on the tiller. The engine piston rods are connected to cranks on a
short vertical shaft, V, which has fast on it the pinion, K, which gears with the
toothed rack, L, there being, in the modification delineated no worm and worm-
wheel interposed between the crank shaft and pinion, K, as in the modification
delineated in my earlier Specification. The shaft, V, which has bearings fixed in
the casing, D, has also above and below the pinion, K, bearing blocks which are
fitted to slide in slot guides, V 1, in upper and lower fork-like extensions of the
tiller, B, and the pinion, K, is kept in gear with the rack, L, by links, V 2, strung
on the shaft, V, and extending above and below the rack, L, to the back of it,
where a roller, V 3, bearing on the back of the rack has its journals held by them.
The toothed rack, L, is straight and at right angles to the middle position of
the tiller, B, in consequence of which arrangement it follows that as the tiller
approaches an extreme or "hard-over" position (as indicated by dotted lines, W,
in Figure, 1) the leverage effect on it increases.
In order to accommodate the movement of the engine along the tiller, B, the
cylinder inlet and outlet pipes, X, X 1, extend from the valve casing to brackets, X 2,
fixed to the casing, D, and thence, horizontal pipes extend through stuffing boxes
into pipes, X3, fixed to the tiller, B, thus forming a telescope arrangement.
The
pipes, X3, are connected by pipes, X4, to the controlling-valve box, X 5, and
this box is connected by pipes, X6, to the box (with stuffing boxes, P1, P2,) which
is above and in the axis of the rudder head, A, and which, with the movement of
the rudder, swivels on the stationary inlet and outlet pipes, P3, P4.
In the part of the machinery for moving the rudder by hand when steam or
other motive fluid is not available, there is, substituted for the toothed sector of my
earlier arrangement, a straight rack-toothed bar, Y, fitted to move athwartship in
guides, Y 1, and having in gear with it the pinion of the handing gear. This bar, Y,
is connected to the rudder by having jointed to it a block, Y 2, fitted to slide
telescopically on a forward or reverse extension, Y 3, of the tiller, B.
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 :-
Arranging steering machinery of the "steam tiller" type, to act in combination
with a rack-toothed bar which is straight or which is curved or partly curved in a
manner to give increased leverage when the rudder is approaching or in an extreme
"hard-over" position the parts being arranged and operating substantially as
hereinbefore described.
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EDMUND HUNT,
Applicant's Agent..