provements in the Construction of Metallic Wheels and Pulleys.
Year: 1890

page_text: Date of Application, 24th Dec., 1890
Complete Specification Left. 24th Sept., 1891-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION
Improvements in the Construction of Metallic Wheels and Pulleys.
I, EVERARD RICHARD CALTHROP of The Byculla Club, Bombay, India,
Engineer, do hereby declare the nature of my invention to be as follows:-
This invention relates to improvements in the construction of metallic wheels,
and pulleys or drums, and more particularly to the wheels of railway carriages and
wagons, tramcars and the like, known as disc or plate wheels, in contradistinction to
spoke wheels.
The invention consists broadly speaking in constructing that part of the wheel
between the hub and the rim or tyre of two or more plates or discs of concentrically
any convenient
corrugated wrought metal plates, preferably steel, secured in
manner to the hub and tvre or rim.
In carrying out my invention in the construction of a railway wheel, for example,
I prepare a suitable hub or central boss, to be secured to the axle, and having a
central outside flange or projection concentric with the centre hole, and prepared
with bolt holes to secure the discs, to each side.
The tyre is also prepared with an internal flange, or member, to which the
circumferential edge of each disc is also secured by bolts or their equivalents.
The discs are preferably made of sheet steel and of any required diameter, they
have a centre hole to receive the hub as far as the flange, and I prefer that both
the outer and inner edges of the discs should be turned over in one direction and
square or thereabouts with the face of the disc, thus forming an edge round the
hole and round the circumference. The hub and the tyre are provided with annular
grooves to receive the beforementioned edges, and when in position bolts are passed
through the discs and the hub and tyre, firmly securing the several parts together.
The discs are corrugated concentrically, by stamping, or by any other method,
and the size and number of such corrugations may be varied.
The discs may be fixed so as to be parallel to each other, but I prefer that they
shall be wider apart at the hub than at the tyre; they may be made from plates of
one equal thickness or they may taper in thickness to the outer edge.
In some cases I may construct the hub with supporting arms, extending towards
but not reaching the rim or tyre; they are enclosed between the two discs, and the
ridges of the corrugations will bear against them, so as to prevent side strain, but
not to interfere with their vertical flexibility.
.
دم
1 1
lom 1000
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Construction of Metallic Wheels and Pulleys.
I, EVERARD RICHARD CALTHROP of The Byculla Club, Bombay, India,
Engineer, 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 :-
This invention relates to improvements in the construction of metallic wheels,
and pulleys or drums, and more particularly to the wheels of railway carriages and
wagons, tramcars and the like, and usually termed disc or plate wheels, in
contradistinction to spoke wheels.
The invention consists broadly speaking in constructing the portion of the wheel

page_text: between the hub and the rim or tyre, of two or more plates or discs of concentrically
corrugated wrought metal, preferably steel, secured to the hub and the rim by any
suitable method.
I have illustrated my invention in the accompanying sheet of drawings, in which
similar letters of reference, indicate similar parts in any of the figures.
Fig. 1, is an elevation of half of a wheel made according to this invention.
Fig. 2, sectional elevation of same.
1
Fig. 3, elevation of half a wheel made upon a modified plan.
Fig. 4, sectional elevation of samé.
In carrying out my invention in the construction of a railway wheel, such as
shown in the drawings, for example, I prepare a suitable hub or central boss A,
which fits upon the axle, and having a central outside flange or projection B, made
concentric with the centre hole C, and prepared with bolt holes to receive the
bolts D, by which the discs or plates E, are held in position.
The tyre or rim F, is also prepared with an internal flange G, to which member
the circumferential edge of each disc E, is also secured by bolts or their
equivalents H.
The discs are preferably made of sheet steel, and have a centre-hole to receive
the hub A, as far as the Hange, and I prefer that both the outer and the inner
edges of the discs should be turned over in one direction, and square or at right
angles with the face of the disc, and forming an edge or flange I, round the centre-
hole and the circumference.
I
To receive these turned up edges or flanges, a corresponding recess or annular
groove B', is made in the hub and the tyre, on each side to receive them.
The discs E, are waved or corrugated concentrically, by, stamping, rolling, or by
any other method, and the size and number of these corrugations may be varied as
desired, or according to the diameter and strength of the plates used.
When the two plates or discs are placed in position, with the flanges inserted into
the recesses as before described they are finally secured by the bolts D and H.
The discs or plates may be fixed so as to be parallel to each other, but I prefer
that they shall be wider apart at the hub, than at the tyre or rim; and they may
be made from plates of one thickness throughout, or the plates may taper in
thickness to the outer edge.
According to the modified construction shown in Figs. 3 & 4, I construct the
hub with a number of radial arms or supports J, extending towards but not
reaching the rim-or-tyre-F-;-these-arms-are-enclosed between the two discs, and
the ridges of the corrugations K, are made to bear or rest against the arms so as
to prevent side strain, but at the same time not to interfere with their flexibility
from the periphery to the centre.
Having now particularly described and ascertained the nature of my said inven-
tion and also the manner in which it may be carried into practice, I declare that
what I claim is :-
1A metallic wheel, or pulley, consisting of a hub A, with encircling flange B,
having annular side-grooves B, two corrugated side plates or discs E, with or
without turned up edges I, and corresponding grooves for them to fit into, said
plates being secured to the hub, and the rim or tyre. by bolts, rivets, or the like,
substantially as herein before described and shown in Figs. 1 & 2 of the drawings.
2-A metallic wheel or pulley, consisting of a central hub, with radial arms or
side plate supports; two corrugated discs; and a rim or tyre supported by the
periphery of each disc, and finally secured by bolts, or rivets, or the like,
substantially as hereinbefore described and shown in Figs. 3 & 4 of the drawings.
Dated the 22nd day of September 1891.
ROBT. F. DRURY, Fel.. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.