IMPROVEMENTS IN APPARATUS CONNECTED WITH SCREW PROPELLERS
Year: 1884

page_text: I, JOHN PALEY, of 20, Saint Vincent Square, Glasgow, in the County of Lanark,
Marine Engineer, do hereby declare the nature of said invention for "IMPROVEMENTS
IN APPARATUS CONNECTED WITH SCREW PROPELLERS" to be as follows:-
This invention of improvements in apparatus connected with screw propellers
relates to means whereby the screw propeller may be readily hoisted or raised
out of the water when steam propulsion is not required thereby allowing the sailing
and steering properties of the vessel to have full play when the screw propeller is
not in use.
According to my invention the axial line of the propeller shaft is on one side of
instead of through the centre of, the stern post, as usually arranged, and the screw
when in working position is behind or astern of the rudder. The outer portion or
stern end of the propeller shaft upon which the screw is mounted is provided with
a jointed coupling at a point somewhat forward of the stern post, the jointed shaft
thús permitting of the screw being raised or lowered by means of a chain or wire
rope from the stern of the vessel. The outer end of the shaft is supported in a
sliding journal block immediately ahead of the screw propeller, the block being
supported in a guide frame or radial slide, secured to the stern post directly above
and below the upper and lower ends of the rudder. Opposite the space occupied
by the propeller shaft the rudder is made with a horizontal opening which permits
of its traversing clear of the propeller shaft when the latter is in working position.
By the above described arrangement the screw propeller may be readily lifted out
of the water and replaced in position, thus enabling sailing vessels to employ
steam propulsion temporarily as for example when traversing calms; at the same
time that full play for the sailing properties of the vessel is afforded when the
screw propeller is not in use.

page_text: I, JOHN PALEY, of 20 Saint Vincent Square, Glasgow, in the County of Lanark,
Marine Engineer, do hereby declare the nature of my invention for "IMPROVEMENTS
IN APPARATUS CONNECTED WITH SCREW PROPELLERS" and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement:―
This Invention of improvements in apparatus connected with screw propellers
relates to means whereby the screw propeller may be readily hoisted or raised out
of the water when steam propulsion is not required thereby allowing the sailing
and steering properties of the vessel to have full play when the screw propeller is
not in use.
According to my invention the axial line of the propeller shaft is on one side,
instead of through the centre, of the stern post as usually arranged and the screw
when in working position is behind or astern of the rudder. The outer portion or
stern end of the propeller shaft upon which the screw is mounted is provided with
a jointed coupling at a point somewhat forward of the stern post, the jointed shaft
thus permitting of the screw being raised or lowered by means of a chain or wire
rope from the stern of the vessel. The outer end of the shaft is supported in a
sliding journal block immediately ahead of the screw propeller, the block being.
supported in a guide frame or radial slide secured to the stern post above and
below the upper and lower ends of the rudder. Opposite the space occupied by
the propeller shaft the rudder is made with a horizontal opening which permits of
its traversing clear of the propeller shaft when the latter is in working position.
"
By the above described arrangement the screw propeller may be readily lifted
out of the water and replaced in position, thus enabling sailing vessels to employ
steam propulsion temporarily, as for example when traversing calms, at the same
time that full play for the sailing properties of the vessel is afforded when the
screw propeller is not in use.
In the accompanying Drawings Fig. 1 is a side view and Fig. 2 an end view
shewing the arrangement of my above described improved apparatus.
a is the propeller shaft, b the screw propeller, and the rudder having an
intervening space between its upper and lower parts to permit of its traversing
clear of the propeller shaft a. d is a jointed coupling on the propeller shaft and
e a journal of the usual or any convenient kind. In Fig. 1 the dotted lines indicate
the position of the screw propeller and shaft when raised or hoisted out of the
water which may be effected by means of the pulley blocks and rope for by any
other suitable hoisting contrivance. When the propeller is to be lifted out of the
water the shaft is turned round until the blades of the propeller and the axis or
pin of the jointed coupling d are in a horizontal position.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The use or employment of a jointed screw propeller shaft in combination with
a rudder having a horizontal opening whereby it may traverse clear of the propeller

page_text: shaft arranged and operating substantially as described and shewn in the drawings
for the purpose specified.
2. The radial slide or guide frame h and sliding journal block g constructed and
arranged substantially as described and shewn in the drawings for the purpose
specified.