Improvements relating to Forcing or Pressing Appliances for Removing Ships' Propellers from their Shafts, and for similar purposes.
Year: 1895

page_text: Date of Application, 26th Oct., 1895
Complete Specification Left, 27th July, 1896-Accepted, 19th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements relating to Forcing or Pressing Appliances for
Removing Ships' Propellers from their Shafts, and for
similar purposes.
We, DAVID THOMAS YOUNG, and HARRY WILLIAM YOUNG, both of Ryland
Street Works, in the City of Birmingham, Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to the manner in which we construct and arrange a series
of forcing or pressing rams within a small compass for the purpose of effecting the
disconnection or removal of steam ship propellers from the shafts on which they
are secured, and for other like services.
In carrying our invention into effect in the construction of a hydraulic forcing
appliance, we form a series of cylinders within or fixed upon an annular collar or
ring, such collar or ring being made in two or more parts, with connecting lugs or
flanges enabling it to be mounted upon a propeller shaft or other body. When
designed for steam ship service, the thickness or width of the collar or ring is made
rather less than the space or distance between the inner side or end of the propeller
boss and the outer extremity of the stern of the vessel, in order that the forcer may
be mounted within the said space upon the propeller shaft.
Within each cylinder formed in or upon the segmental ring or collar we fit a
ram or plunger providing each with the necessary cup leather or other packing.
The inner end of each cylinder is closed, preferably by the solid metal forming
part of the ring, but a connection is made for the admission of water under pressure
from the hydraulic pump to force out the rams, and for the return of the water to
the pump on the return of the rams within their respective cylinders. We
preferably employ an independent hydraulic force pump arranged for operation
either by hand or mechanical power, and having one supply pipe in communication
with the cylinders in each segment of the forcer.
When the forcer is mounted upon a propeller shaft within the space herein-
before described for effecting the disconnection or removal of the propeller, the
bydraulic pressure is admitted to the cylinders and the whole of the rams are forced
out simultaneously, and thus a great force is brought to bear against the propeller
around the whole of the inner side or end of its central boss. Under this evenly
distributed pressure the propeller is gradually forced from the shaft by the
advancing rams, but in the event of difficulty in effecting the first movement we
provide for the insertion of wedges between the propellers and the forcer, in order
to obtain an additional initial force beyond that due to the combined total pressure
exerted upon the rams.
We provide any suitable ordinary connections for controlling the admission and
release of pressure in the cylinders, and employ such other usual fittings as are
necessary in connection with the forcer on the pump.
We do not limit the application of our invention to any one particular type of
pattern of forcing or pressing appliance, but make such modifications as may be
necessary in its adaption for varying services.
Dated this 25th day of October 1805
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.

page_text: Improvements relating to Forcing or Pressing Appliances for
Removing Ships' Propellers from their Shafts, and for
similar purposes.
We, DAVID THOMAS YOUNG, and HARRY WILLIAM YOUNG, both of Ryland
Street Works, in the City of Birmingham, Engineers, 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 :-
This invention relates to the manner in which we construct and arrange a series
of forcing or pressing rams within a small compass for the purpose of effecting the
disconnection or removal of steamship propellers from the shafts on which they
are secured, and for other like services.
In the four accompanying sheets of explanatory drawings to be hereinafter
referred to:-
Figure 1, Sheet 1, is a front elevation, and Figure 2 an end elevation of one
form of an improved forcing appliance. Figure 3 is a sectional elevation to a
larger scale of the supply connection between the cylinders.
On Sheet 2, Figure 4 is a front elevation, and Figure 5 an end elevation of our
forcing appliance as fitted with external connecting pipes between the cylinders.
Figure 6 is a sectional view on a larger scale of the connection for the ends of the
pipes.
On Sheet 3, Figure 7 is a front elevation, Figure 8 an end elevation, Figure 9 a
sectional elevatiou, and Figure 10 a sectional plan representing one modified form
of our appliance, having the cylinder ring or collar formed in two parts which are
hinged or pivotted together.
On Sheet 4, Figure 11 is a front elevation of our appliance having a three part
segmental cylinder ring or collar, and Figure 12 is a similar view of our appliance
having a two part ring or collar with cylinders formed therein for the reception of
rams of the ordinary circular section.
The same reference letters in the different views indicate the same parts.
In carrying our invention into effect in the construction of a hydraulic forcing
appliance, we form a series of cylinders within or fixed upon an annular collar or
ring, such collar or ring being made in two or more parts, with connecting lugs or
flanges such as A (Sheets 1 and 2) enabling it to be mounted upon a propeller
shaft or other body. When designed for steamship service, the thickness or width
of the collar or ring is made rather less than the space or distance between the inner
side or end of the propeller boss and the outer extremity of the stern of the vessel,
in order that the forcer may be mounted within the said space upon the propeller
shaft. The upper half of Figure 1 represents a pair of segments bulted closely
together, whilst the lower half of the figure illustrates a space between the two
adjacent segments such as exists when the appliance is mounted upon a larger shaft.
In the same manner the segments on the right hand at Figure 4 are shown with a
space between their adjacent lugs, whilst the left hand segments are bolted closely
together.
Within each cylinder formed in or upon the segmental ring or collar we fit a
ram or plunger B, providing each with the necessary cup leather or packing. The
inner end of each cylinder is closed, preferably by the solid metal forming part of
the ring, but a connection is made for the admission of water under pressure from
the hydraulic pump to force out the rams, and for the return of the water to the
pump on the return of the rams within their respective cylinders. We preferably
employ an independent hydraulic force pump arranged for operation either by

page_text: hand or mechanical power, and having one supply pipe in communication with the
cylinders in each segment of the forcer.
In one method of forming a connection or communicating passage between the
cylinders we drill a hole through the connecting bolts and provide side or lateral
passages C, as illustrated at Figure 3, and form like passages D in the segments of
the cylinder ring or collar. To one of such hollow connecting bolts we couple or
attach the supply pipe E which serves as the common supply pipe of the complete
appliance.
In another method of connecting the cylinders we employ external pipes such
as F (Sheet 2) having their ends fixed to adjacent segments of the cylinder ring or
collar as illustrated. The supply is then admitted through the pipe E to one of
the cylinders, and from thence flows through the external piping and thus charges
the whole of the cylinders.
Air cocks such as G of any ordinary description are fitted to the segments to
permit of the ready escape of air on charging the cylinders with water or other
liquid and eye links or bolts such as H are provided to facilitate the lifting or
handling of the forcer. We also provide tapped or screwed holes such as J in the
upper face of the rams B for the insertion of the screwed ends of withdrawing rods
whenever it may be necessary to remove the rams for re-packing and for other
purposes, and similar holes in the lower face of the rams for the packing retaining
studs.
When the forcer is mounted upon a propeller shaft within the space hereinbefore
described for effecting the disconnection or removal of the propeller, the hydraulic
pressure is admitted to the cylinders and the whole of the rams are forced out
simultaneously, and thus a great force is brought to bear against the propeller
around the inner side or end of its central boss. Under this evenly distributed.
pressure the propeller is gradually forced from the shaft by the advancing rams,
but in the event of difficulty in effecting the first movement we drive wedges
between the propeller and the forcer, in order to obtain an additional initial force
beyond that due to the combined total pressure exerted upon the rams.
We sometimes form the cylinder ring or collar in two parts which we hinge and
connect together in the manner illustrated on Sheet 3, and at Figure 12 on Sheet 4,
and we also form it from three parts having two hinges or pivots as illustrated at
Figure 11, Sheet 4.
We employ round cylinders and rams such as illustrated at Figure 12 in the
construction of our improved forcing or pressing appliances, or rams and cylinders
of a circular segmental configuration such as illustrated at Figures 1, 4, 7, and 11,
or we make them of such other form as may be best adapted to the particular
purpose for which the machine is required.
We do not limit the application of our invention to any one particular type or
pattern of forcing or pressing appliances, but make such modifications as may be
necessary in its adaption for varying services.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is.--
1. The improved forcing or pressing appliance consisting of a series of forcing
or pressing rams fitting within cylinders formed within or fixed upon a segmental
collar or ring, substantially as and for the purposes described.
2. In forcing or pressing appliances the use of a segmental collar or ring having
chambers or cylinders formed within or upon the same for the reception of the
forcing or pressing rams, the segments being secured together by bolts or by hinged
or pin connections, substantially as and for the purposes described.
3. The construction of hydraulic forcing or pressing appliances having rams and
cylinders of a circular segmental configuration substantially as and for the purposes
described.
4. The construction of a hydraulic forcing or pressing appliance having rams

page_text: fitting within cylinders formed in a segmental collar or ring, the segments being
secured together by hollow connecting bolts having lateral passages such as C
communicating with like passages D formed in the segments, substantially as and
for the purposes herein before described, and as illustrated on Sheet 1 of the
accompanying drawings.
5. The construction of a hydraulic forcing or pressing appliance having rams
fitting within cylinders formed in a segmental collar or ring, and pipes or tubes
such as F forming communications between the cylinders, substantially as and for
the purposes hereinbefore described and as illustrated on Sheet 2 of the
accompanying drawings.
6. The construction of a hydraulic forcing or pressing appliance having rams
fitting within cylinders formed in a segmental collar or ring, the segments being
hinged or pivotted together, and the cylinders having communicating passages
between them substantially as and for the purposes herein before described and as
illustrated on Sheets 3 and 4 of the accompanying drawings.
7. The improved general construction and arrangement of a hydraulic forcing
or pressing appliance substantially as and for the purposes described.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.