Improvements in Stuffing Box Glands, more especially intended for the Stern Tubes of Screw Propeller Shafts.
Year: 1892

page_text: .Date of Application, 29th Jan., 1892
Complete Specification Left, 8th Sept., 1892-Accepted, 15th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Stuffing Box Glands, more especially intended for
the Stern Tubes of Screw Propeller Shafts.
1, WILLEM FREDERIK DANIEL VAN OLLEFEN, of 35 Hoogte Kadijk,
Amsterdam in the Kingdom of Holland, Ship and Engineer Surveyor, to Lloyd's
Register of British and Foreign Shipping do hereby declare the nature of this
invention to be as follows:-
The object of my invention is to enable fresh packing to be placed in stuffing
boxes under conditions in which, with glands as hitherto constructed the glands
cannot be removed in consequence of external pressure forcing the old packing out
and preventing the insertion of new packing. Glands made according to my
invention are especially adapted for use in the stuffing boxes of the stern tubes of
screw propeller shafts as packing can be inserted whilst the ship is at sea, even
without stopping the ship, but my invention is applicable to other cases in which
it is necessary to provide means for retaining the old packing whilst new packing is
being inserted.
According to my invention I make the gland in parts which originally form
virtually one gland but which, when the packing becomes worn so that the gland
cannot be moved further inward, can be separated so as to leave in the stuffing box
a part, or parts, which will retain the packing in the stuffing box whilst the other
part or parts of the gland is, or are, removed so that fresh packing can be inserted
and then the last named part or parts of the gland will be again inserted to act as
the gland for this fresh packing. I do not limit myself to precise construction of
the gland according to my invention but a convenient construction is to provide a
ring which fits into, or against, the inward end of the main part of the gland and is
attached by undercuts, or dovetails or screws or otherwise with pieces which lie in
grooves in the main part of the gland and have lugs which enter holes in the lugs
of the main part of the gland. The nuts of the gland-bolts are of a size which will
bear on the lugs of the pieces which lie in the said grooves but will pass through
the holes in the lugs of the main part of the gland. Cotter pins, or the like, may
be passed through the lugs so as to retain the whole of the parts of the compound
gland together.
A washer placed over the bolt between the nut and the lugs is of such a size as
to bear on both lugs and the gland can then be forced home like an ordinary gland.
There are two, or more, such arrangements of lugs around the gland. When the
gland cannot be further tightened up and it is desired to insert more packing the
nuts are removed separately (so that the other, or others, meantime holds, or hold,
the gland in place) and the washers are taken off and the nuts replaced so that they
bear on the lugs only of the pieces which are connected to the aforesaid ring and
then the main part of the gland can be removed as the ring will remain in the
stuffing box and will retain the old packing and fresh packing can then be inserted
into the space at the rear of the said ring and then the main part of the gland can
be replaced and forced home onto the new packing. I have given the foregoing as
a convenient way of performing my invention in order that its nature may be
well understood but as before stated I do not limit myself to this particular
construction.
Dated this 29th day of January 1892.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Stuffing Box Glands, more especially intended for
the Stern Tubes of Screw Propeller Shafts.
I WILLEM FREDERIK DANIEL VAN OLLEFEN of 35 Hoogte Kadijk
Amsterdam in the Kingdom of Holland Ship and Engineer Surveyor to Lloyd's
Register of British and Foreign Shipping 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:-
The object of my invention is to enable fresh packing to be placed in stuffing
boxes under conditions in which with glands as hitherto constructed, the gland
cannot be removed in consequence of external pressure forcing the old packing out
and preventing the insertion of new packing. Glands made according to my
invention are especially adapted for use in the stuffing boxes of the stern tubes of
screw propeller shafts as packing can be inserted whilst the ship is at sea even
without stopping the ship but my invention is applicable to other cases in which it
is necessary to provide means for retaining the old packing whilst new packing is
being inserted into the stuffing box.
According to my invention I make the gland in parts which originally form
virtually one gland but which when the packing becomes worn so that the gland
cannot be moved further inward (or it is desirable not to move it further inward)
can be separated so as to leave in the stuffing box a part or parts which will retain
the packing in the stuffing box, whilst the other part or parts of the gland is or are
removed, so that fresh packing can be inserted into the said stuffing box and then
the last named part or parts of the gland will be again inserted into the said
stuffing box to act as the gland for this fresh packing. I will describe with
reference to the accompanying drawings the best means with which I am acquainted
for carrying my invention into practical effect but I do not limit myself to the
precise details shewn.
Figure 1 is a longitudinal section of a gland constructed according to my invention
when first put in place in the stuffing box of the stern tube of a screw propeller
shaft.
Figure 1 shews detail views (at right angles to each other) of a part thereof.
Figure 2 is a front view of the same with the propeller shaft in section.
Figure 3 is a longitudinal section shewing the position when part of the gland is
drawn back for the insertion of fresh packing.
Figures 4 and 5 are views of a modified construction of gland according to my
invention shewing in Figure 4 the gland with the parts attached and in Figure 5
the position of the parts when part of the gland is removed for the insertion of fresh
packing.
Referring to Figures 1, 1A 2 and 3 A is the flange of the stern tube with the
stuffing box B through which passes the shaft C of a screw propeller. The gland
consists of a main part D provided with lugs d'. A ring G fits into the main part
of the gland D and is attached to pieces H by the dovetail or wedge joint as shewn
these pieces lying in grooves de formed in the main part of the gland D and having
lugs which enter holes formed in the lugs d' of the main part of the gland D.
The abutting part of the ring G and gland D may be of any suitable form for
instance such as is shewn in Figure 34. Cotter pins J may be passed through the
lugs and so as to retain the whole of the parts of the compound gland together.
Kare washers placed over the bolts E between the nuts F and the lugs d and h
the said washers being of such a size as to bear on both lugs so that by tightening
up the nuts F the compound gland is forced bome like an ordinary gland. I have
shewn two ordinary lugs and screws and two pieces H with lugs for keeping the
ring G in position but I do not limit myself to the precise number which may be
employed.

page_text: When fresh packing is to be inserted, by reason for instance of the gland being
incapable of being tightened up by reason of the lugs coming into contact with the
flange A, the nuts F are removed and the washers are taken off and the nuts are
then replaced so that they bear only on the lugs of the pieces H and the cotter
pins J are withdrawn. This operation is of course performed with one nut at a
time so that the gland is held in place by one or more of the nuts at all times. The
main part D of the gland can now be removed (see Figure 3) as the ring G will
remain in the stuffing box (being held therein by the nuts F) and will retain the
old packing B in position. Fresh packing can then be inserted and be forced home
by the gland D.
Referring to the modification shewn in Figures 4 and 5 B is the stuffing box,
formed with the lugs A', at the rear of which is the flange A of the stern tube.
Bolts L pass through holes in the gland D and screw into the ring G to secure
the said ring to the gland. M are screws which pass through the stuffing box and
are caused to enter recesses in the ring G when in position between them. After
packing has been inserted into the stuffing box the main part of the gland D with
the ring G secured to it is tightened up by means of the nuts F on the bolts E and
the packing forced home as in Figure 4. When it is desired to insert fresh
packing the ring G is first held in its aft position by means of the screws M
(Figure 5) the bolts L may then be withdrawn as the old packing cannot be forced out
being held in position by the ring G. The nuts F are then removed and the main
part of the gland D can then be drawn back and fresh packing be inserted into the
stuffing box and then the main part of the gland D is replaced and forced home
onto the new packing.
I do not limit myself to the number of parts constituting my compound gland
as these may be varied in number to suit the requirements of particular cases.
Glands made according to my invention may be also employed in connection
with pumps such as for instance pumps for mines, drainage or the like and generally
in such cases and where essential machinery may even be kept at work whilst new
packing is being inserted.
Any suitable packing such as for instance rope yarn or metallic packing may be
used with my compound glands.
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 :-
First. A stuffing box gland composed of parts forming when placed together one
gland but so combined that one part or parts can be removed so as to allow fresh
packing to be placed in the stuffing box into which the compound gland was
originally inserted whilst the other part or parts remains or remain in the said
stuffing box to retain the old packing in place substantially as hereinbefore
described.
Second. The general combination and arrangement of parts constituting the
gland for stuffing boxes substantially as herein before described and illustrated in
Figures 1, 14 2 and 3 of the accompanying drawings.
The general combination and arrangement of parts constituting the claim for
tuffing boxes substantially as herein before described and illustrated in Figures 4
nd 5 of the accompanying drawings.
Dated this 8th day of Sentember 1802
J. H. JOHNSON & Co.,
Agents.