Improvements in the Construction of Pulleys.
Year: 1889

page_text: Date of Application 7th Sept., 1889-Accepted, 14th Dec., 1889
COMPLETE SPECIFICATION.
Improvements in the Construction of Pulleys.
We RICHARD MORRIS of Beechfield Doncaster in the County of York Engineer
and JAMES WOOD of West Stockwith in the County of Nottingham 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 has for its object to provide a pulley which is both stronger and
lighter than are pulleys made in the ordinary ways. According to this Invention
the boss is made of wrought metal in parts as hereinafter described and illustrated
and having formed between them recesses which when the parts are placed together
form the openings for the inner ends of the spokes. On the said parts being bolted
or rivetted together after the spokes are put in place they press upon and firmly
grip the inner ends of the said spokes. The boss is made up of two discs or side pieces
which when placed together form the boss and each of these discs or pieces is divided
laterally so that the boss is made up of four or more parts which are formed by
forging or pressing them to such a shape that the opening for the axle and the
recesses for the inner ends of the spokes are formed by the forging or pressing tool.
The blank for each part of the boss is preferably a piece of wrought metal of a
semi-circular shape with a web at right angles thereto to form the part for the
reception of the bolts by which the parts of the boss are jointed together laterally.
The spokes are preferably made of an oval form in cross section with the longer axis
of the oval situated in the plane of rotation of the pulley and the rim is by preference
made of metal plate either flat or curved or pressed up into the desired grooved or
other form suitable for bands or ropes as required. The metal employed is by
preference wrought steel but it may be other metal capable of being wrought.
We will describe with reference to the accompanying drawings a pulley made of
wrought steel with a boss in four parts although it is to be understood that we do not
limit ourselves to the use of wrought steel nor to making the boss with each disc in
two parts as each disc may be made in more than two parts if desired.
Figure 1 shews part of the pulley a part of the boss being removed―Figure 2
shews the boss with a part removed. Figure 3 shews one of the parts of the boss
separately and Figures 4 and 5 are a plan and an edge view of a blank such as each
part of the boss is forged or pressed from. The hub is made up of the parts A¹ A² A³
and A' each part being made by taking a blank like that shewn in Figures 4 and 5
and forging or pressing in it the semi-circular recess B for the axle and the recesses C
for the inner ends of the spokes, these recesses each being made somewhat less in
depth than half the thickness of the spokes so that when the parts of the boss are
rivetted or bolted together they grip the said ends of the spokes and secure them
firmly in place in the boss. We have shewn for this purpose rivets D situated
between the spokes and passing through the parts of the boss opposite to each other.
E are bolts and nuts by which the parts A1 A2 and A³ A' of the boss are secured
together, the said bolts being passed through the flanges a on the said parts of the
boss. The spokes F are preferably made oval as shewn and the rim G is made of
metal plate. A plain rim is shewn in the drawing but a rim of any suitable form
may be used. For instance for rope haulage it is preferred to use a corrugated rim
with grooves therein made by pressing the flat plate to the desired form or to
approximately that form and then bending and rolling or pressing it into the circular
form of the rim this rolling or pressing perfecting the grooves. The inner ends of
the recesses at h and the abutting ends at i of the spokes are both preferably flat or
of such corresponding shape that they abut closely together.

page_text: Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. A pulley made with its several parts of wrought metal and having the parts
connected up as hereinbefore described and illustrated.
2. A pulley boss formed of two discs each in two or
hereinbefore described and illustrated.
Dated this 7th day of September 1889
more parts substantially as
J. H. JOHNSON & Co.,
Agents.