Improvements in the Manufacture of Pulleys, Disc Wheels, Hubs, and similar Articles.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Pulleys, Disc Wheels, Hubs,
and similar Articles.
We, CHARLES ROCHOLL, Foreman, and THE WESTMINSTER MANUFACTURING COMPANY
LIMITED, Manufacturers, both of 29A Gillingham Street, Pimlico, London, S.W., do
hereby declare the nature of. this invention to be as follows:-
:-
The object of this invention is to produce, by simple mechanical pressure, without
the aid of brazing or similar operations, pulleys, whether grooved or straight, disc
wheels, hubs for velocipede wheels, and similar articles, and the invention consists in
placing shaped metallic pieces or parts edge to edge upon an internal ring, and, by
pressure in suitable dies, striking up the parts, so that the internal ring is caused to
grip or interlock with the shaped metallic pieces or parts, and hold them firmly
together.
In carrying out this invention, say (by way of example) for the manufacture of a
grooved pulley, two caps are formed (by drawing in a manner now well known) from
discs of metal, the crowns being depressed to a greater or less extent, as may be
desired. These two caps are placed edge to edge on a ring, of a width equal to the
total width of the two caps, and the whole is subjected to pressure in dies of suitable
form, so as to press outwards the extending rims of the caps, and form a rounded
groove on the periphery, with the interlocking ring inside.
In like manner, a hub for a wheel may be formed, the extending rims of the caps,
in this case, being made longer than before, and being turned up, say, at right angles,
to form the flanges.
As the internal tube will also be turned up, the parts will interlock, and thus be
held securely together.
Whatever the article may be that it is desired to produce, the same principle will
be involved, namely, the parts will be of double thickness, and shaped up by pressure
in suitable dies, with an interlocking piece or ring inside.
Dated this 3rd day of March 1897
"Improvements in the Manufacture of Pulleys, Disc Wheels, Hubs,
and similar Articles."
We CHARLES ROCHOLL Foreman and THE WESTMINSTER MANUFACTURING COMPANY
LIMITED both of 29A Gillingham Street, Pimlico London S.W do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
5 particularly described and ascertained in and by the following statement:-

page_text: the aid of brazing or similar operations, pulleys whether grooved or otherwise disc
wheels hubs for velocipede wheels and similar articles, and the invention consists in
placing shaped metallic pieces, or parts, edge to edge upon an internal ring, and by
pressure in suitable dies, striking up the parts, so that the internal ring is caused to
grip or interlock with the shaped metallic pieces or parts, and hold them firmly
together.
In the accompanying drawings the various stages through which the metal passes
to produce a grooved pulley are illustrated in sectional views and plan views which
will be more particularly referred to hereafter.
A disc blank is first cut from the metal sheet, and is subjected to the action of a
series of dies by which the boss a is formed, as described in the specification of
Letters Patent No. 1568 of 1897 for which we have made application. This boss a
is intended to serve as one end of the axle of the pulley. This disc is next subinitted
to the action of the dies, by which the edge is turned down to form a downwardly
extending flange, by which means a cap with a central boss is produced.
The next operation is shewn at Figs 1 and 2 in which the cap, as previously
produced, is recessed to form a hollow flange b, the boss a extending beyond the plane
of the bend of the flange.
The parts to form the pulley are then put together, as illustrated in Figs: 3 and 4
that is to say, one part (see Fig: 1) is taken, and a loose ring or strip of metal c is
inserted inside the hollow flange (see Fig: 3): another part (see Fig: 1) is then
placed over the ring, as seen in Fig: 4.
The assembled parts (Fig: 4) are next placed in suitably shaped dies, and pressure
is applied, by which means the hollow flanges b, with the ring c inside may be curved
outwards as seen in Fig: 5 thus at the same time producing a grooved pulley or
wheel and locking the two halves (Fig: 1) together by the ring c or the curve may
turn inwards the effect being the same.
By the above described construction an immensely strong pulley is produced from
sheet metal of much less weight and much greater strength than the ordinary cast
pulley of commerce.
It will be obvious that the bosses a may if desired, be dispensed with, and holes
may be made for a separate axle (shouldered or otherwise) as indicated at Figs : 6
and 7 or a bush of any kind for a pin axle may be inserted without departing from
the nature of this invention, but for many purposes in the arts the boss axle a will
be preferred.
It will be obvious that the pulley may be strengthened by the insertion of straight
or other discs placed between the two discs shown.
To produce a wheel hub the same operations are carried out, the parts operated
upon being of larger dimensions.
In Fig: 8, the parts are shown in position corresponding to Fig: 4, and at Fig: 9
the hollow flanges are struck up to form the finished hub, in the manner
corresponding to that illustrated by Figs: 5 and 7.
The hub, in fact, is simply an exaggerated grooved pulley, and the same letters of
reference will apply to corresponding parts.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is :-
1. As a new article of manufacture, a pulley or wheel produced from sheet metal
by pressure in dies, as shown and described, and consisting of two recessed parts
with outwardly extending hollow flanges, and a loose interlocking ring or strip
inserted in the hollow flanges as set forth.
2. As a new article of manufacture, a pulley or wheel produced from sheet metal,
and consisting of two parts, with hollow flanges, mounted upon a ring or bent strip
which enters the hollow flanges, the said flanges with the ring or strip inside, being
caused by pressure in dies to assume the required shape and by which means the
two parts are firmly locked together as set forth.

page_text: 3. In the manufacture of pulleys or wheels hubs and other articles locking shaped
hollow portions together by means of an internal ring or strip which is caused to
interlock with the hollow portions by the operation of suitable dies as set forth.
4. The construction of pulleys wheels hubs and similar articles as herein shown
and described that is to say placing shaped hollow metallic pieces or parts edge to
edge upon a ring or strip and by pressure in suitable dies striking up the parts so
that the internal ring or strip is caused to grip or interlock with the shaped metallic
pieces or parts and hold them firmly together as set forth.
Dated this 20th day of
1007