Improvements in Sheaves or Pulleys.
Year: 1891

page_text: Date of Application, 8th Dec., 1891-Accepted, 9th Jan., 1892
COMPLETE SPECIFICATION.
Improvements in Sheaves or Pulleys.
I, JAMES MAPES DODGE of 139 South Fourth Street, in the City of Philadelphia,
and State of Pennsylvania one of the United States of America, Mechanical
Engineer, do hereby declare the nature of my invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:--
The object of my invention is to construct a wheel or pulley for drive ropes or
belts in which the face can be increased or diminished, the main object of my
invention being to so construct the parts that wheels having one or more grooves
can be readily built up from stock in hand, avoiding the necessity of making
patterns or turning a special wheel for every odd order, a further object being to so
combine the several parts composing the finished wheel, that wheels for light and
heavy work can be built up from the sections.
and
In the accompanying drawings:-
Figure 1 is a side view of a rope pulley constructed according to my invention.
Figure 2 is a section of a part with a hub which I will call the "hub section,"
Figure 3 is a section of one of the rings without a hub which I will call the
ring section."
Figure 4 is a view of a built up wheel having three grooves.
Figure 5 is a side view of one of the rings.
Figure 6 is a perspective view of part of one of the sections shewing the lug for
aligning the several sections.
Figure 7 is a view showing a recess into which the lug extends.
Figure 8 is a view of a light wheel having three grooves with one spoke section
and two rings.
Figures 9, 10, 11 are views of modifications of my invention.
A is the hub section of a complete wheel having a single groove a as clearly
shewn in Figure 2. This section has a hub B, spokes b and rim A¹.
D, (Figs. 3 and 5) is the ring section there being in this no spokes or hub the
rings having lugs d at intervals through which pass the securing bolts.
On one side of each section is a series of pins or lugs e and on the opposite side
of each section are a series of orifices f the pins and orifices being so arranged that
when the sections are placed together as shewn in Figure 4, the pins are in line
with, and pass into, the orifices, thereby aligning the several sections so that the
grooves in each section will be true with the axle line of the wheel.
In making the wheel and sections, I may chill the surface of the wheel at the
groove a and also the pins and the recesses. The several parts are preferably chilled
at one operation.
Passing through orifices c (in the present instance through the spokes 6 of the
spoke section) are a series of bolts C, these bolts also passing through orifices in
the lugs d on the ring section D. The bolts are provided with nuts, and when
tightened hold the sections together, as clearly shewn in Figs. 4 and 8.
Heretofore in the manufacture of grooved pulleys it has been customary to make
a single casting and turn grooves therein, consequently a pattern had to be made
for every different kind of pulley required. This is expensive and often the spokes
and the general outline of the wheel have had to be reduced and strengthened
according to the work for which the wheel is intended.
Now by simply making for one diameter pulley the pattern for a ring section and
pattern for a hub section, a pulley having a face of any width can be built up, and

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of any number of grooves, for instance in Fig. 4, I have shewn a wheel having
three grooves made up of two spoke sections and one ring section.
A wheel of this character is intended for heavy work owing to the fact of the use
of the two hub sections, and if it is desired to make it still heavier three hub sections
may be used.
The several projections e enter their several orifices and together with the
transverse securing bolts C lock the several sections together, making a perfectly
true and substantial wheel or pulley.
In Figure 8, I have shewn a built up wheel having three grooves made from two
ring sections and one hub section. This wheel is intended for light work.
It will be understood that if only two grooves be necessary, one ring section can
be readily secured to the hub section and the number of rings or hub sections can
be increased according to the number of grooves or the width of the face desired.
It will be understood that the sections may be either cast, forged or otherwise
produced.
In Figures 9 and 11 I have shewn the projections and orifices in the form of a
tongue and groove at the sides of the sections extending around the ring instead of
being merely lugs and recesses. In Figure 10 I have shewn the lugs and recesses
at the bolt holes.
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. The combination of a sheave or pulley of a hub section comprising a hub,
spokes, and grooved rim, all made in one piece, a ring section likewise grooved, and
disposed at the side of the hub section, and securing bolts passing through the hub
and ring sections, substantially as hereinbefore described.
2. The combination of the hub section, having a hub, and a grooved rim adapted
to receive a drive rope and a ring section having a grooved face adapted to receive
a drive rope and situated at the side of the hub section, the ring section being
centered upon the hub section, and clamping devices securing the ring section
rigidly to the hub section, substantially as hereinbefore set forth.
3. The combination of the hub section, having a hub, and a grooved rim adapted to
receive a drive rope, a ring section having a grooved face adapted to receive a
drive rope and situated at the side of the hub section, one section interlocking with
the other section so as to align the faces of the two sections, and securing bolts for
attaching the ring section fixedly to the hub section, substantially as herein before
described.
4. The combination in a built up sheave or pulley of the hub section and ring
section of the same diameter and situated side by side, rope grooves in the faces of
both sections to receive a drive rope, and lugs at the side of one section near the
periphery, the other section having recesses in its side near the periphery in line
with the lugs, with securing bolts passing through the two sections whereby the
sections are locked together, the lugs taking the strain off the bolts, substantially
as hereinbefore described.
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