Improvements in Apparatus for Removing Screw Propellers and Wheels from Shafting.
Year: 1889

page_text: Date of Application, 18th Mar., 1889
Complete Specification Left, 10th Oct., 1889-Accepted, 21st Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Removing Screw Propellers and
Wheels from Shafting.
JAMES BOWER 28 Martins Lane Cannon Street London E.C. gentleman, do hereby
declare the nature of this invention to be as follows:-
As
My invention consists in the construction of an apparatus for taking off propellers
from the tail end shaft of steamers, while standing in dry dock, slipway, etc.
also for any other similar use, where a very great power is required in a very short
distance. The means employed being taper pins and dies with legs.
The very important end gained will be an immense decrease in friction compared
with wedges, screws etc. and hence much more power.
This apparatus can also be used when the vessel is afloat and simply tipped at stern
to shift propeller.
The apparatus consists of two slightly tapered pins and two "dies," each "die"
consisting of two square blocks of metal, having a taper hole drilled to fit the taper
"dies" are
pin, half in one block and half in the other, making when the blocks or
put together an oblong taper hole, having legs welded on to same and extending to
such a length that they go nearly to the bottom of the dock, or at any rate beyond the
bottom of stern frame.
The working is as follows
The apparatus is placed between the propeller boss and the stern of the ship,
staying off shaft between coupling and stern tube bulkhead, or other suitable resisting
surface.
The short shaft is taken out then apparatus put in position by placing the "dies"
between the propeller boss and stern of ship or other resisting surface, one on each
side of the shaft, wedges are also applied, so as just to take up the slack, between the
"dies
"and the propeller boss and stern of the ship. The bottom wedge will be
secured by a leg welded on to same which is clamped to the "dies' " fixings.
When the taper pins are driven home between the "dies," the. "dies are forced
apart and thus loosen the propeller from the shaft.
To prevent the "dies" from slipping out of the space between the propeller and
stern of ships, the legs are clamped together by bolts and plates or other suitable
means.
"
The "dies pins and wedges will be made of as hard and tough steel as will
possibly stand.
The pin and hole of "dies" will be made quite smooth, and fat or soap used to
lubricate same.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Removing Screw Propellers and
Wheels from Shafting.
JAMES BOWER Laxevåg pr. Bergen do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
a certained in and by the following statement:-
My invention consists in the construction of an apparatus for taking off propellers
from the tail end shaft of steamers, while standing in dry dock, slipway, etc.
As

page_text: also for any other similar use, where a very great power is required in a very shor
distance. The means employed being taper pins and dies with legs.
The very important end gained, will be an immense decrease in friction compared
with wedges, screws etc., and hence much more available power. This apparatus
can also be used when the vessel is afloat and need only be tipped at stern to shif
propeller.
31.
"
dies
32
e, e, each
The apparatus consists of two slightly tapered pins d, and two
die
consisting of two square blocks of metal, having a taper hole 1, drilled to fit
the taper pin, half in one block and half in the other, making, when the blocks or
"dies
are put together an oblong taper hole. These blocks or "dies" have legs h
welded on to them and extending to such a length that they go nearly to the bottom
of the dock, or at any rate beyond the bottom of the stern frame of the ship.
The working is as follows a
The apparatus is placed between the propeller boss b, (see Fig. 1.) and the stern g
of the ship, staying off the shaft inside the ship between the coupling on same and
stern tube bulkhead, or other suitable resisting surface to prevent the same from
being drawn out of its place. .
Then the apparatus put in position, by placing the "dies "e, e¹ between the propeller
and the stern of ship, one on each side of the shaft c wedges are also applied, so as
just to take up the slack between the "dies" e, el and the propeller boss b, and the
stern of the ship a, or other resisting surface. The bottom wedge f¹ will be secured
by a leg welded on to same which is clamped to the "die" fixings:
When the taper pins d are driven home between the "dies" e, e¹ the dies. ar
. forced apart and thus.loosen the propeller b, from the shaft c. To prevent the dies
from slipping out of the space between the propeller boss b, and stern of ship, a the
legs are clamped together by bolts and plates, or other suitable means.
J
The dies e, el pins d, and wedges f,, will be made of as hard and tough steel as
they will possibly stand the pins and holes of "dies "will be made quite smooth, and
fat or soap used to lubricate same.
In the accompanying drawing
Fig. 1. is a side elevation of my invention showing part of stern of ship.
Fig. 2. end view of dies, with pin and legs welded on.
Fig. 3. View through line a. y.
Fig. 4. Section through line a. b.
Fig. 5. Plan of screw propeller showing apparatus in position.
a. Ship.
b. Screw propeller boss..
c. Shaft..
d. Taper pins.
... e, e¹, Dies or blocks.
ff, Wedges.
. Stern of ship.
h. Legs on dies.
i. Bolts and plates.
j. Wood or other packing.
k. Stern frame of ship.
1. Taper hole in dies
Having now particularly described and ascertained the nature of my said inven-
ion, and in what manner the same is to be performed, I declare that what I
aim is
(1)In a device for removing screw propellers and wheels from shafting, the
ombined arrangement as shown, consisting of two or mor. sets of "dies".and taper
ns, each set consisting of 2 dies-or blocks and one taper pin, with legs welded on
o the dies or blocks; with or without wedges, substantially as described and for the
urpose set forth.
=
Having now particularly described and ascertained the nature of my said inven-
ion, and in what manner the same is to be performed, I declare that what I
laim is :-
(1) In a device for removing screw propellers and wheels from shafting, the
ombined arrangement as shown, consisting of two or mor. sets of "dies" and taper
ns, each set consisting of 2 dies-or blocks and one taper pin, with legs welded on
o the dies or blocks; with or without wedges, substantially as described and for the
urpose set forth.

page_text: (2) In a device for removing screw propellers and wheels from shafting, the
employment of dies or blocks e, e¹, with or without legs h, and taper pins d.
substantially as described and for the purpose set forth.
Dated thin 10th day of Antahan 1000
E. EATON & Co.,
Agent for Applicant.