Improvements in Flywheels and other Large Wheels for Motors.
Year: 1891

page_text: Date of Application, 31st Mar., 1891
Complete Specification Left. 17th Dec.. 1891-Accepted. 6th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Flywheels and other Large Wheels for Motors.
I, WILLIAM BRUCE THOMPSON, of Ellangowan, Dundee, in the County of
Forfar, North Britain, Engineer, and Shipbuilder, do hereby declare the nature of
this invention to be as follows, that is to say:
:-
My said invention has for its object to construct flywheels and other large
wheels and fix them on their shafts in an improved manner and so that their
weight may be better supported, and it is specially applicable to the heavy and
broad flywheels of large factory steam engines or motors.
In carrying out my invention according to one modification in which the fly-
wheel is made with one set of spokes, I have the boss, (made separately from the
arms if necessary) elongated so as to extend as far as conveniently possible along
the shaft between the bearings, the said boss being made with the middle part of
its interior enlarged and so that the boss bears on the shaft at and near its ends
only. In this way the weight of the flywheel is made to act on the shaft at parts
close to the supporting bearings.
In cases in which the flywheel is made with a broad rim, as for example when
employed for driving with ropes and having a number of groves, I make the rim
in two parts bolted together by internal flanges, each rim being of half the full
width and having its own set of spokes; and I fix the two sets of spokes in separate
bosses which are fixed on the shaft as near as conveniently possible to the supporting
bearings at each side.
Dated this Thirtieth day of March 1891.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Flywheels and other Large Wheels for Motors.
I WILLIAM BRUCE THOMPSON, of Ellangowan, Dundee in the County of
Forfar, North Britain, Engineer and Shipbuilder, 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, that is
to say :-
My said invention has for its object to construct flywheel and other large wheels
and fix them on their shafts in an improved manner and so that their weight may
be better supported, and it is specially applicable to the heavy and broad flywheels
of large factory steam engines or motors.
And in order that my said invention and the manner of performing the same
may be properly understood, I hereunto append a sheet of explanatory drawings
to be hereinafter referred to and showing two examples of my improved wheels
for large factory steam engines or other motors.
Figure, 1, of the drawings is a vertical section of one example of my improved
flywheel, and Figure, 2, is a vertical section of another example.
In these
drawings the same reference letters are used to mark the same or like parts
wherever they are repeated.
In carrying out my invention according to one example as shown in Figure, 1,
in which the flywheel is made with one set of spokes, A, I have the boss, B,
made separately from the arms, A, and elongated so as to extend as far as
The said
conveniently possible along the shaft, C, between the bearings, D.

page_text: boss, B, is made with the middle part of its interior, E, enlarged so that the boss
bears on the shaft, C, at and near its ends only. In this way the weight of the
flywheel is made to act on the shaft, C, at parts, F, close to the supporting
bearings, D.
In cases in which the flywheel is made with a broad rim, J, as shown in
Figure, 2, such for example as are employed for driving with ropes, and are
made with a number of grooves, H, I make the rim, J, in two parts, J, bolted
together by bolts, K, and with internal flanges, L, each rim, J, being of half the
full width of the flywheel. Each half of the rim, J, is supported at its outer
edge, M, by a set of spokes, A, which are fixed with one end to the rim, J, by
means of bolts, l', and the other end to bosses, Q, by means of bolts, R. The
said bosses, Q, are quite separate the one from the other, and are arranged to
bear on the shaft, C, as near as conveniently possible to the supporting bearings
at each side.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The improvement in flywheels and other large wheels for motors consisting in
carrying them on elongated bosses which bear on the shafts only at and near
their ends and which are near the bearings substantially as hereinbefore described.
Dated this Sixteenth day of December 1891.
EDMUND HUNT,
Applicant's Agent.