Improvements in Propeller and other Shafts and Rolls.
Year: 1899

page_text: Date of Application, 13th Jan., 1899
Complete Specification Left, 12th Oct., 1899-Accepted, 25th Nov., 1899
Improvements in Propeller and other Shafts and Rolls.
I, JAMES MOLLISON, of 6, Hillside Gardens, Partickhill, in the City of Glasgow,
Principal Engineer Surveyor, Lloyd's Register of Shipping, do hereby declare the
nature of this invention to be as follows:-
This invention, which relates to propeller and other heavy shafts and rolls,
has for its object to obviate the danger due to fracture especially of propeller
shafts, while also providing support in the length of such shafts to lessen lateral
strain and vibration.
of
The improved shaft or roll, instead of being made of a solid forging or a
hollow casting as heretofore, is composed of an outer hollow shell, which may
be made in the ordinary way, is bored out centrally and has driven into it a core
"Lowmoor" or other strong fibrous iron or steel which in the event
of fracture of the outer hollow shaft will serve to transmit motion
as if the compound shaft remained unbroken. The central core or inner
shaft may be slightly tapered or formed with tapered portions of its length and
the outer shaft is bored to suit the contour of the core so that when the latter is
driven in the compound shaft so formed becomes practically solid.
In order further to so bind together the outer and inner parts of the shaft
that rotatory motion may be transmitted through it notwithstanding fracture
of the outer shell the bore of the latter may be made oval and the central core
correspondingly formed to fit it, or the parts may be prevented from turning by
keys driven in between them at the ends, or the outer shell may be shrunk on
to the core; and longitudinal movement of the one part on the other may be
prevented by extending the core through the hollow shaft and securing it by
a nut or piu.
Tated this 10th of Lanna 1000
Improvements in Propeller and other Shafts and Rolls.
I, JAMES MOLLISON, of 6, Hillside Gardens, Partickhill, in the City of Glasgow,
Principal Engineer Surveyor, Lloyd's Register of Shipping, do hereby declare the
[Price 8d.]

page_text: 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, which relates to propeller and other heavy shafts and rolls,
has for its object to obviate the danger due to fracture especially of propeller
shafts, while also providing support in the length of such shafts to lessen lateral
strain and vibration.
The invention is illustrated by the accompanying drawings, Fig. 1 shewing
it applied to a propeller shaft, and Fig. 2 as applied to a thrust shaft.
"
The improved shaft or roll, instead of being made of a solid forging or a
hollow casting as heretofore, is composed of an outer hollow shell A, which may
be made in the ordinary way, is bored out centrally and has driven into it a
core B of Lowmoor" or other strong fibrous iron or steel which in the event of
fracture of the outer hollow shaft A will serve to transmit motion as if the
compound shaft remained unbroken. The central core or inner shaft B may be
slightly tapered or formed with tapered portions of its length and the outer
shaft A is bored to suit the contour of the core B so that when the latter is driven
in the compound shaft so formed becomes practically solid.
In order further to so bind together the outer and inner parts of the shaft
that rotatory motion may be transmitted through it notwithstanding fracture
of the outer shell A the bore of the latter may be made oval and the central
core B correspondingly formed to fit it, or the parts may be prevented from
turning by keys driven in between them at the ends, or the outer shell A may
be shrunk on to the core B; and longitudinal movement of the one part on the
other may be prevented by extending the core B through the hollow shaft and
securing it by a nut D or pin.
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:
―
A propeller or other shaft or roll composed of an outer hollow shell having
a circular or oval bore extending through it, and a core of strong fibrous iron
or steel secured therein for the purpose set forth.
Dated this 11th day of October 1899
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
('hartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.