Improved Means for Preventing the Corrosion of Propeller Shafts of Marine Engines.
Year: 1893

page_text: Date of Application, 25th Nov., 1893
Complete Specification Left, 27th Aug., 1894-Accepted, 29th Sept., 1894
PROVISIONAL SPECIFICATION.
Improved Means for Preventing the Corrosion of Propeller Shafts of
Marine Engines.
I, EDWARD JORDAN of 26 Parade, Cardiff, in the County of Glamorgan,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to improved means for preventing the corrosion of propeller
shafts of marine engines. In the Complete Specification of Letters Patent
No. 15582, Aug. 30th 1892, granted to me, I described and illustrated a method
of employing a suitably formed temporary ring or gland placed close up to the
sleeve in order to prevent the escape of the insulating material. According to the
present invention, I propose to dispense with the temporary ring entirely and in its
place to provide a permanent arrangement consisting of one or more layers of
canvas well saturated with red-lead, paint, or an equivalent. The portion of the
canvas next to the sleeve is folded over and a cord of any suitable flexible material
is inserted in the fold, thus forming a bulb or rib right around the shaft when the
canvas is placed thereon. A recess is bored up into the end of brass sleeve,
preferably, larger on the inside, and the bulb inserted therein, the whole of the
canvas being then bound over with any suitable binding material. The putty is
then forced into the inner recess through the aperture provided in the end of the
brass sleeve as set forth in the Complete Specification of my before mentioned
Patent. The application of this form of canvas stopping, with its bulbed end,
I also claim to use with or without reference to any former Patent, and when not
used in connection with the said Patent, I propose to recess the end of the sleeve
to a somewhat less extent than before described, the outer end or mouth of the
recess being larger than the inner, and taking the form of a countersunk or bell
mouth, the bulb end of the canvas being placed well up into the recess and the
whole bound round as before described, the binding commencing at the outer end
of the canvas sleeve and continuing up to the bulb, forcing the same well up into
the recess.
The bulb shaped end may be, if necessary, filled with red-lead, putty
or other suitable material, so that it shall, when forced in by the binding, take the
form of the inside of the recess and hermetically seal the joint, thereby preventing
the possibility of the entrance of moisture and the consequent corrosion.
Dated this 25th day of November 1893.
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Means for Preventing the Corrosion of Propeller Shafts of
Marine Engines.
I, EDWARD JORDAN of No. 26 The Parade, Cardiff, in the County of
Glamorgan, 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 :-
My invention relates to improved means for preventing the corrosion of those
portions of the propeller shafts of marine engines, which revolve with brass
sleeves on them in sea water.

page_text: In the Specification of my former Patent No. 15582 August 30th 1892, I have
described a method of preventing the corrosion which is always set up along where
the sea water can get at the contacting metals of the shaft and sleeve, by injecting
a suitable waterproof insulator into an annular recess in the end of the sleeve
between the latter and the shaft, such insulator being injected radially through the
sleeve against a temporary stopping ring fixed on the shaft so as to close the said
recess. After the removal of the stopping ring, the reduced end of the sleeve
shews itself to be effectually separated from the shaft by the interposed insulator
and as the latter is waterproof, the two metals cannot be acted upon by the salt
water at any point where they touch each other.
According to the present invention, I dispense with the above mentioned
temporary stopping ring, and use a permanent one of peculiar construction. It is
capable of being used either as a stopping ring or as insulator and stopping ring
combined.
Referring to the accompanying figures,
Figure is a side elevation of the tail end of a propeller shaft and its
sleeves to which the present invention, in either of its forms, has been applied.
Figure 2 is a vertical section through one side of the end of a sleeve shewing
the annular recess to receive the insulator as well as that to receive the operative
part of the permanent stopping ring.
Figure 3 is a longitudinal section through the permanent stopping ring.
Figure 4 is a longitudinal section through the sleeve end of Figure 2 and
the stopping ring of Figure 3 shewing them both in their respective final
positions.
Figure 5 is a longitudinal section through one side of the end of a sleeve
and a permanent ring discharging the function of both insulator and stopping
ring.
a, a is the tail end of a propeller shaft and b, bare the two brass sleeves on it.
One of these has both its ends in water while the other of them will have only its
stern end in. Consequently there are three applications of the invention to the
shaft, indicated in Figure 1.
Referring to Figures 2, 3 and 4, c is the annular recess in the sleeve end to
receive the injected insulator. In my former Patent the insulator recess has its
mouth flush with the end of the sleeve. According to the present invention, a
second annular recess d is cut in the said end outside the insulator recess c, the two
communicating. Both recesses resemble each other in respect that their radial
dimensions increase with the distance from the sleeve end.
The permanent stopping ring consists of a band of canvas, e, a filling f and a
whipping cord g. The band of canvas is wide enough to surround and lap over
the filling and also to provide a margin e.
The canvas may be of any suitable thickness and in one or more layers.
should be well saturated with red lead, paint, or other equivalent material.
It
The filling is a piece of flexible cord, of a sufficient diameter to, in conjunction
with the canvas on opposite sides of it, till the recess d. The enlargement which
is produced along one end of the band e, by the enclosure within the folded canvas
of the filling f, is pushed into the cavity d and the canvas band whipped to the
shaft A by the cord g, the whipping extending from the opposite end, over the
margin e, and quite up to the enlargement, as illustrated in Figure 4, so that
the filling is tightly held within the fold and the enlargement forced up into the
recess d so as to fill it and effectually stop the insulator cavity c.
The insulator is then forced into its cavity c in the manner described in my
former Patent.
Referring to Figure 5, a single recess is cut in the end of the sleeve. Its
major diameter is in the plane of the sleeve end, whence the recess gradually
decreases. The permanent stopping ring is made of the same material as described
with reference to Figures 2, 3 and 4.
The filling i is of suitable plastic such as red lead or putty. The whipping g is

page_text: started from the opposite end of the band e and is continued until its advance over
the margin e and up to the fold enclosing the filling i, compels the latter to force
the former up into the recess h. Preferably as much filling is used as will suffice
to produce an enlargement larger than the recess, as indicated in the figure.
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 :-
1. The hereinbefore described permanent stopping ring as illustrated in
Figures 2, 3 and 4.
2. The herein before described combination of permanent stopping ring and
cavity in the sleeve end, as set forth with reference to Figures 2, 3 and 4.
3. The hereinbefore described combination of permanent stopping ring, cavity
in the sleeve. end, and insulator cavity, as set forth with reference to Figures 2, 3
and 4.
4. The combination of insulator and stopping ring, as set forth with reference
to Figure 5.
5. The combination of sleeve, cavity in the end thereof, and combined insulator
and stopping ring, as set forth.
Dated this 25th dex of An 1901
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.