Improvements in Propeller Shafts.
Year: 1899

page_text: Date of Application, 3rd Aug., 1899
Complete Specification Left, 30th May, 1900-Accepted, 30th June, 1900
PIVOVIDIUNALITICAL
Improvements in Propeller Shafts.
I, DONALD BARNS MORISON, of Hartlepool Engine Works, Hartlepool, in the
County of Durham, Engineer, do hereby declare the nature of this invention
to be as follows:-
A method often adopted for the prevention of corrosion at the ends of the brass
liners on propeller shafts, is to shrink on an iron ring at a distance from the
end of the brass liner and fill the space between with a rubber ring, the surfaces
of the liner end and of the iron ring being at right angles or inclined to the
axis of the shaft.
My invention relates to an improved arrangement of this form of joint,
whereby technical advantages are obtained which render the joint better adapted
to prevent insidious leakage, the effect of which is so highly dangerous on
propeller shafts.
In carrying out my invention the diameters of the inner ends of the liners
and of the iron rings are reduced for a portion of their length and between the
ends of these reduced portions is a narrow space. This space is filled with a
protective compound, such as elastic cement, up to the level of the reduced
diameters of the liner and iron ring, and the whole reduced section is then
made up with a rubber ring or the like. It will be seen that the horizontal
surfaces of the reduced diameters form an efficient joint for the rubber ring
whilst the narrow space is an additional protection against insidious leakage,
especially as it may be filled with elastic cement which is again protected from
injury by the outer covering.
Dated this Second day of August 1800
Improvements in Propeller Shafts.
I, DONALD BARNS MORISON, of Hartlepool Engine Works, Hartlepool, in the
County of Durham, 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:
-
A method often adopted for the prevention of corrosion at the ends of the brass
liners on propeller shafts is to shrink on an iron ring at a distance from the
end of the brass liner and fill the space between with a rubber ring, the surfaces
of the liner end and of the iron ring being at right angles or inclined to the
axis of the shaft.
My invention relates to an improved arrangement of this form of joint,

page_text: whereby technical advantages are obtained which render the joint better adapted
to prevent insidious leakage, the effect of which is so highly dangerous on
propeller shafts.
In carrying out my invention the diameters of the inner end or ends of the
forwand or the after or both liners and the iron rings are reduced for a portion
of their length and between the ends of the reduced portions is a narrow space.
This space is filled with a protective compound, such as elastic cement, up
to the level of the reduced diameters of the liner and iron ring, and the
remainder of the reduced section is then made up with a rubber ring or the
like. It will be seen that the horizontal surfaces of the reduced diameters form
an efficient joint for the rubber ring, whilst the narrow space is an additional
protection against insidious leakage especially as it may be filled with elastic
cement which is again protected from injury by the outer covering.
In the accompanying drawing Fig. I shows a propeller shaft with brass liners
and iron rings arranged with joints according to my invention, and Fig. II
shows a sectional detail of the joints to a larger scale.
The inner end of each liner a is reduced in diameter for a portion of its
length at b, a corresponding reduction in diameter being made in the iron
ring cat d the space e is filled with a protective compound such as elastic
cement up to the level of the reduced diameter of the brass liner and iron
ring, and the remainder of the reduced section is then made up by a ring f of
indiarubber or other suitable material. It will be seen that by this arrange-
ment the horizontal surfaces of the reduced diameters provide an efficient joint
for the indiarubber ring, the space e forming an additional protection against
insidious leakage by means of the elastic cement which is protected from injury
by the outer covering f.
Instead of elastic cement or other compound, the space e may be filled with
an indiarubber ring in a similar manner to the space containing the ring f if
so desired.
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
I am aware that rubber rings have been used with iron rings for the protection
of shafts, and I make no claim for such a broad combination, but what I do
claim is:
1st. In a propeller shaft, in which an iron ring is fitted at a distance from
the end of the brass liner and the intermediate space filled with a rubber ring
for the purpose set forth, a joint, in which the diameters of the inner ends of
the liner and of the ring are reduced for a portion of their length so that the
outer surfaces of such reduced portions are approximately parallel to the axis
of the shaft, the space between the reduced ends of the liner and ring forming
a receptacle for a protective compound or a rubber ring, and the space between
the unreduced ends of the liner and ring forming another receptacle for the
reception of protective compound or a rubber ring, for the purpose of preventing
the insidious leakage of sea water to the shaft between the ends of the brass
liner and iron ring.
2nd. A joint for the protection of the ends of brass liners on propeller shafts
as illustrated in Figs. I & II and as described in this specification.