provements in Power or Driving Pulleys, Driving Drums, or the like.
Year: 1899

page_text: Date of Application, 12th June, 1899
Complete Specification Left, 12th Mar., 1900-Accepted, 14th Apr., 1900
PROVISIONAL SPECIFICATION
Improvements in Power or Driving Pulleys, Driving Drums,
or the like.
I, THOMAS SHEPHERD, of 3, Gainsborough Street, Plymouth Grove, Manchester,
in the County of Lancaster, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates more particularly to wrought iron pulleys but can also
be applied to any kind of driving pulleys or drums, and is designed with the
object of increasing the strength of the pulley and also making the same boss
fit any size of shaft.
In existing pulleys the arms are placed in single, double, or treble sets in line.
This is found objectionable on account of the space between each set being so
great that the pulley is liable to spring. This objection is overcome in the follow-
ing manner. The arms of the pulley are arranged in zig-zag fashion so as to
practically always get one arm under the working point of the strap. This will
prevent the rim of the pulley springing and also enable the maximum power
to be transmitted without wear and tear to the belting, rivet heads on the
periphery of the pulley and also where the arms join the boss.
The boss is made solid or in halves and may have any number of circular discs
according to the number of arms required in the puller. Each of these discs are
formed with corrugations, lugs or projections at each side of it in zig-zag fashion.
The boss is cast with a hole to receive a split bush which is preferably in four
pieces and on the periphery of this bush is formed eight projections. The four
pieces of the bush are placed in the hole of the pulley the projections on same
being so tapered as to slide against corresponding inclines formed in the boss of
the pulley.
On tightening down the bolts for fastening the two halves of the pulley together
the taper of the indentation so formed in the boss of the pulley causes the four
pieces of the bush to close in and securely fasten the pulley to the shaft. These
bushes are interchangeable and can be made any bore so that the same pulley
can be used for one or more sizes of shaft, if the taper projections do not draw or
reduce the diameter of the bush sufficient.
The lugs on the periphery of the boss are drilled to receive the arms which are
driven in preferably while the boss is hot or in any other suitable manner.
Dated this 10th day of June 1899.

page_text: Improvements in Power or Driving Pulleys, Driving Drums,
or the like.
I, THOMAS SHEPHERD, of 3, Gainsborough Street, Plymouth Grove, Manchester,
in the County of Lancaster, Engineer, do hereby declare the nature of this inven-
tion 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 more particularly to wrought iron pulleys but can also
be applied to any kind of driving pulleys or drums, and is designed with the
object of increasing the strength of the pulley and also making the same boss
fit practically any or several sizes of shafts.
In existing pulleys whether built up or cast or moulded the armis between the
boss and rim are generally placed in single, double, or treble line that is to say,
with the ends of the arms in the double or treble arrangements on one centre line
across the rim of the pulley parallel to its axis. In practice this is found to be
objectionable inasmuch as that portion of the rim of the pulley between the arms
is liable to spring under the tension of the belt or strap and consequently the
rim becomes loose on the rivetted ends of the arms. A similar objection is found
with pulleys having a single row of arms and this is further accentuated by
the rim springing in the direction of its width. According to my invention
I overcome these objections by arranging the arms in zig-zag fashion so as to
practically always get one arm under the working point of the strap. This will
prevent the rim of the pulley springing and also enable the maximum power to be
transmitted without wear and tear to the belting, rivet heads on the periphery of
the pulley and also where the arms join the boss. I also make the boss with one
or more discs according to its width and form on each side of each disc corruga-
tions, ears, lugs or projections so that those on one side alternate with those on
the other. My improvements also relate to an improved form of bush which will
be particularly referred to hereinafter.
My invention will be fully described with reference to the accompanying
drawings in which
Fig. 1 is a partial side elevation of a wrought iron or built up pulley with
my improvements applied,
Fig. 2 a partial sectional plan of same,
Fig. 3 a sectional elevation and
Fig. 4 a partial cross section of the boss of the pulley and bush for securing it
to the shaft.
In carrying out my invention I make the boss with one or more discs a, accord-
ing to the width and strength of the pulley and the number of arms required and
provide on each side of it lugs, ears or projections b, those on one side alternating
with those on the other. Into these lugs are secured either plain or screwed
arms c the upper ends of which are attached by rivetting to the rim d of the
pulley, one arm being in advance of the other or zig-zag. Of course it will be
understood that the same arrangement of arms may be used in connection with
plain bosses.
The boss is made solid or in halves, as shown, and is cast with a parallel hole e
to receive a parallel split bush f which is preferably made in four pieces and on
the periphery of this bush are formed eight projections g. The four pieces of
the bush are placed in the hole of the pulley the projection g on same being so
tapered as to slide against corresponding inclines h formed in the boss of the
pulley. On tightening down the bolts for fastening the two halves of the pulley
together the taper of the indentation so formed in the boss of the pulley causes

page_text: the four pieces of the bush to close in and securely fasten the pulley to the shaft.
These bushes are interchangeable and can be made any bore so that the same
pulley can be used for one or more sizes of shaft, if the taper projections do not
draw or reduce the diameter of the bush sufficient.
It will, of course, be obvious that the bush may be used for all kinds of
pulleys, discs, bosses or the like requiring to be secured to shafts, and that a
wrought iron pulley constructed as described is much stronger and less liable to
disintegration than those hitherto constructed.
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:-
1. In a wrought iron or like pulley the use of a boss composed of one or more
discs provided on each side with ears, lugs, projections or the like b, the lugs
on one side alternating with those on the other substantially as described.
2. In a wrought iron or like pulley the combination of a boss composed of one
or more discs such as referred to in Claim 1 or one or more plain discs arms c
arranged in zig-zag form both in the boss and rim & and rim substantially as
described.
3. In a wrought iron or other pulley or the like a boss such as a provided with
two or more ways in its eye or hole, tapered at the sides in combination with a
corresponding bush having tapered projections such as g substantially as and
for the purpose described.
4. The general arrangement, construction and combination of parts forming my
improvements in pulleys substantially as described with reference to the accom-
panying drawings.
Doted this 10th day of March 1900.
WILLIAM H. TAYLOR,
Stephens Buildings. 62, Market Street, Manchester,
Agent for the Applicant.