Improvements in Stern Tubes of Screw Steam Ships, and in Appliances relating thereto.
Year: 1896

page_text: Date of Application, 29th May, 1898
Complete Specification Left, 1st Mar., 1897-Accepted, 8th May, 1897
PROVISIONAL SPECIFICATION.
Improvements in Stern Tubes of Screw Steam Ships, and in
Appliances relating thereto.
I, DETLER CARSTEN FRIEDRICH WULFF, of Brook Strasse, 13, Bremen,
Germany, Mechanical Engineer, do hereby declare the nature of my said invention to
be as follows:-
The object of my invention is to construct a stern tube for propeller shafts
which can be filled with oil or other lubricating substance so as to reduce the
friction and wear and tear of the bearing parts and also to prevent corrosion of the
shaft which are some of the chief causes of break downs at sea.
I effect these objects by constructing, in addition to the stuffing box and gland
at the fore end of the stern tube, a stuffing box with gland at the after end of the
stern tube outside the ship, so that water and sand or other dirty substances may
be prevented entering the stern tube and thereby destroying the lignum vitæ liners
and the shaft.
In new vessels I make the shaft of bare iron or steel without brass liners and
the stern tube I bush with a cast iron or white metal bush at both ends. The
aftermost bush I shorten sufficiently to provide space for the packing gland and a
specially formed metallic packing ring. The gland and packing ring are made
with a number of oval recesses to receive the same number of springs which will
always keep the packing in the stuffing box space tight. The gland and the bolts
for securing it are protected by the nut which holds the stern tube and which is
recessed or dished out to receive them. The stern tube is filled with a suitable
lubricant through a pipe placed above the tube inside the ship. Another pipe
which is fitted at the bottom part of the stern tube, is led to the tunnel for the
purpose of testing the contents. The gland which I make of white or other
suitable metal may be formed in halves if required.
For existing screw steamers and in ordinary cases where the stern tube is bushed
with lignum vitæ strips and the propeller shaft lined with brass, a stuffing box may
be constructed at the after end by boring out the after part of the lignum vitæ
strips and to a certain amount also the brass bush. If in this way sufficient
space is obtained a gland and ring can be fitted as already described and both
protected by a wrought iron ring shrunk outside the nut on the stern tube.
As a modification of the mode of construction herein described I bore out the
brass bush in the stern tube to the bottom and into the space so formed fit a
solid metal stuffing box which will contain the gland and packing as in the other
two cases.
..
ليوم
1
1000
R. HEBER RADFORD,
Agent for the Applicant.

page_text: Improvements in Stern Tubes of Screw Steam Ships, and in
Appliances relating thereto.
I, DETLER CARSTEN FRIEDRICH WULFF, of Brook Strasse, 13, Bremen,
Germany, Mechanical Engineer, do hereby declare the nature of my said invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The object of my invention is to construct a stern tube for propeller shafts
which can be filled with oil or other lubricating substance so as to reduce the
friction and wear and tear of the bearing parts and also to prevent corrosion of the
shaft which are some of the chief causes of break downs at sea.
I.effect these objects by constructing, in addition to the stuffing box and gland
at the fore end of the stern tube, a stuffing box with gland at the after end of the
stern tube outside the ship, so that water and sand or other dirty substances may
be prevented entering the stern tube and thereby destroying the lignum vitæ liners
and the shaft.
My invention will be better understood on reference to the accompanying sheet
of drawings, in which,
Fig. 1, is a longitudinal section of the aftermost end of one of my improved stern
tubes as constructed for a new ship.
Fig. 2, being a similar view of a stern tube of an existing ship.
Fig. 3, being a similar view of a modified arrangement for an existing ship.
Fig. 4, is an end view looking on to the stern gland.
Fig. 5, is a view looking at the forward end of the stern gland shewing the oval
recesses for the reception of the springs.
Figs. 6 & 7, are two enlarged views of the springs.
The same letters refer to similar parts throughout the several views.
.
In new screw steam ships I make the shaft, a, Fig. 1, of bare iron or steel
without brass liners or casings and the stern tube, b, I bush, with a cast iron or
white metal bush c, at both ends. The aftermost bush, c, I shorten sufficiently to
provide space for the packing glaud, d, and a specially formed metallic packing
ring, e. The gland and packing ring are made with a number of oval recesses, f,f
to receive the same number of springs, g,g, which will always keep the packing in
the stuffing box space, tight. The gland, d, and the bolts, h, h, for securing it are
protected by the nut, i, which holds the stern tube and which is recessed or dished
out to receive them. The stern tube is filled with a suitable lubricant through a
pipe,j, placed above the tube inside the ship. Another pipe, k, which is fitted at
the bottom part of the stern tube, is led to the tunnel for the purpose of testing
the contents. The gland which I make of white or other suitable metal may be
formed in halves if required.
For existing screw steam ships and in ordinary cases where the stern tube is
bushed with lignum vitæ strips, l, and the propeller shaft cased with brass, m, a
stuffing box may be constructed at the after end by boring out the after part of
the lignum vitæ strips and to a certain amount also the brass bush, n, in the stern
tube as shewn in Fig. 2. If in this way sufficient space is obtained a gland, d, and
packing, ring, e, can be fitted as already described and both protected by a wrought
iron ring, o, shrunk outside the nut, i, on the stern tube.
As a modification of the mode of construction herein described, I bore out the
lignum vitæ strips, 1; and the brass bush, n, in the stern tube for a certain
distance to the bottom and into the space so formed I fit a solid metal stuffing
box, p, which will contain the gland and packing as in the other two cases as shewn
in Fig. 3.

page_text: 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. In stern tubes of screw steam ships, in addition to the stuffing box and gland
at the fore end of the stern tube; the arrangement and combination of parts and
appliances comprising a specially formed gland and packing ring inserted at the
after end of the stern tube outside the ship, the bush or liners of the said stern
tube being sufficiently shortened at the after end to form a packing space between
the shaft and the stern tube, such space being in effect the stuffing box into which
the packing is inserted and secured by the packing ring and gland, the said
packing ring and gland being provided with a number of oval annular recesses to
receive a corresponding number of springs, the gland being secured to the stern
tube by studs, set screws or bolts and protected by a recessed stern tube nut, in
the manner and for the purposes substantially as herein described and illustrated in
Figs. 1, 4, 5, 6 & 7, of the accompanying sheet of drawings.
2. In stern tubes of screw steam ships, in addition to the stuffing box and gland
at the fore end of the stern tube; the arrangement and combination of parts and
appliances comprising a stuffing box and specially formed gland and packing ring,
such stuffing box being inserted at the after end of the stern tube outside the ship,
the bush, or the bush and liners, of the said stern tube being sufficiently shortened
at the after end to receive the said stuffing box, the gland and packing ring of
which being formed and secured with the said stuffing box to the stern tube and
protected, in the manner and for the purposes substantially as herein described and
illustrated in Figs. 3, 4, 5, 6 & 7, of the accompanying sheet of drawings.
3. In stern tubes of screw steam ships, in addition to the stuffing box and gland
at the fore end of the stern tube; the arrangement and combination of parts and
appliances, comprising a specially formed gland and packing ring inserted at the
after end of the stern tube outside the ship, a stuffing box for the reception of the
said gland and packing ring being formed or constructed at the after end by boring
out the after part of the lignum vitæ strips and also by boring out to a certain
extent the brass bush in the stern tube the gland being secured to the stern tube
and protected by the stern tube nut in the manner described in Claims 1 and 2, or
protected by means of a wrought iron ring shrunk outside the nut on the stern
tube, in the manner and for the purposes substantially as herein described and
illustrated in Figs. 2, 4, 5, 6 & 7, of the accompanying sheet of drawings.
Dated this 27th dan of Tah 1907
R. HEBER RADFORD,
Agent for the Applicant.