Improved Screw Propeller.
Year: 1895

page_text: Date of Application; 22nd Oct., 1895
Complete Specification Left, 7th Apr., 1896-Accepted, 9th May,
1896
PROVISIONAL
SPECIFICATION.
Improved Screw Propeller.
JAMES BROWN ARCHER, Engineer 9 Brinkburn Terrace South Shields JOSEPH
HUGH BLACKBURN Engineer 26 Windsor Road Lowestoft, do hereby declare the
nature of this invention to bo as follows:-
This propeller consists of a spoked wheel, and blades which are bolted, at any
desired pitch to the periphery of the wheel, the boss of which is fastened in the
usual manner to the screw shaft.
By this means the power is applied outside the periphery of the wheel while
the water flows freely through the spokes of the wheel.
Dated this 21st day of October 1895.
JAMES B. ARCHER.
J. H. BLACKBURN.
JAMES BROWN ARCHER, 9 Brinkburn Terrace South Shields Engineer and
JOSEPH HUGH BLAOKBURN 26 Windsor Road Lowestoft Engineer do heroby
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 propeller consists of a spoked wheel and blades which are bolted at any
desired pitch to the periphery of the wheel, the boss of which is fastened in the usual
manner to the scrow shaft, by this means the power is applied outside the periphery
of the wheel while the water flows freely through the spokes of the wheel, which
by their construction assist in the propulsion.
The objects of this invention is to produce a propeller, with less vibration and
slip, and actual advance of the ship increased also with greater facility of going
astern.
The improvements constituting of tho said invention consists of a spoked wheel of
peculiar construction of about one half to three quarters the diameter of the
propeller upon the periphery of which the blades are secured by bolts so that each
blade stands perpendicular to the axis of the wheel and crosses the same at noy
required angle.
The accompanying drawing which forms part of the Specification and is referred
to therein by figures and letters represents a propeller the same as nur invention.
Reference to drawing
Figure 1 represents front elevation
Figure 2 a side view
Figure 3 a cross section
Letter A is the hose
•

page_text: The wheel consists of the boss A which is fixed to the driving shaft in the usual
manner by keys and nuts having the spokes B 1. B attached to and being part of the
boss A. and periphery C, the spokes B 1, B arranged in pairs the leading spoke B1
on the forward part of the boss A in advance of spoke B having its leading
side truly radial to the boss A and the following spoke B at the after part of boss A
having its following side truly radial to the boss A so that the friction of the water
between boss A and periphery C is more readily overcome and the least possible
slip combined with the greatest rate is secured.
The blades D aro set upon the periphery C and secured to the same by bolts at
any required angle with the longitudinal axis of the wheel perpendicular and spirally
to it, so as to form a screw as free as possible from dead water.
The boss A, spokes B 1, B and periphery C form the wheel which can be cast of
any suitable metal in one piece or built in sections, the boss A and periphery C
being made separately and connected by the spokes B 1, B being bolted or screwed
to each.
The blades D are rectangular in form and are smoothly finished so as to give as
little friction to the water as possible, these blades may either be cast of any
suitable metal or made of malleable iron, they can then be galvanised.
Having now particularly described and ascertained the nature of our said
invention and the manner the same is to be performed we declare that what we
claim is :-
1st. The herein described propeller consisting of a wheel about one half the
diameter of the propeller with spokes arranged in pairs and blades secured upon
the periphery of the wheel at any required angle with the longitudinal axis of the
wheel, perpendicular and spirally to it as and for the purpose set forth.
2nd. In a propeller the combination of wheel and blades secured to the periphery
of the wheel as and for the purposo set forth.
Dated this 4th day of April 1898.