Improvements in and relating to Driving Pulleys.
Year: 1891

page_text: Date of Application, 4th June, 1891
Complete Specification Left, 3rd Mar., 1892-Accepted, 9th Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in and relating to Driving Pulleys.
I, ALLAN CAMERON, Yr., of Macdougall Street, Greenock, Renfrewshire,
Timber Merchant, do hereby declare the nature of my invention to be as
foilows:-
--
This invention has reference to and comprises a new or improved construction of
motive power driving pulleys, for ropes and round bands, and specially applicable
for making them suitable for fast and loose driving pulleys mounted on shafts, for
the purpose of more easily and expeditiously shifting the driving bands or ropes
from the one pulley to the other, and putting the motive power into or out of
action with such driving bands.
The improvements consist in constructing the outer side rim flange or edge of
cach fast and loose pulley much as usual or a little deeper, but in forming the inner
or adjacent side flanges or edges of considerable less diameter, and with a V or
other shaped groove between the two flanges of each pulley but closer to the inner
flanges, for the band or rope to grip in, that is leaving an open space beyond the
inner side flanges and between the outer side flanges of the fast and loose pulleys
fitted close together. By this improved construction of pulleys the band or rope
can be very quickly and with small power shifted from the fast to the loose pulleys
and vice versa.
The bands would preferably be shifted on these improved pulleys
by a belt fork which would give a combined lifting or outward and lateral move-
When a
ment to instantaneously shift them from the one pulley to the other.
number of these improved driving pulleys and ropes are mounted on one shaft, each
fast pulley would require a loose pulley adjacent to it, with the short flanges next it.
But for driving in reverse directions with an open and cross driving band or rope
respectively, the centre pulley might be made with one deep centre flange, with a
groove on each side of it, and with short flanges on its outer edges adjacent to the
grooved pulleys on opposite sides of it with low flanges and grooves adjacent to the
side of the central pulley, and having high or deep rims on their outer edges. For
this arrangement the centre pulley would preferably be the fixed pulley, with the
loose pulleys out-side, so that a lifting and lateral shifting fork would preferably be
used separately for each band, to put the one band into or out of action before the
other fork or band was moved to reverse the motion of the fast pulley.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Driving Pulleys.
1, ALLAN CAMERON, Younger, of Macdougall Street, Greenock, Renfrewshire,
Timber Merchant, 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 in writing, reference being had to the accompanying
drawings:-
This invention has reference to and comprises a new or improved construction of
motive power driving pulleys, for ropes and round bands and specially applicable
for making them suitable for fast and loose driving pulleys mounted on shafts, for
the purpose of more easily and expeditiously shifting the driving bands or ropes

page_text: from the one pulley to the other, and putting the motive power into or out of action
with such driving bands.
And in order that ny said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunto
appended two explanatory sheets of drawings in which
Figure 1, on Sheet 1 represents a transverse section, and Figure 2 a side eleva-
tion of combined fast and loose pulleys mounted on a shaft, and as constructed in
accordance with my improvements.
Figure 3 on Sheet 2 is a sectional elevation of another arrangement of my
improvements in which a double grooved fast pulley a a and two sets of loose
pulleys bb, are combined in one on the same shaft A.
And Figure 4 is a modified arrangement of Figure 3, in which the double
grooved fixed pulley a a is formed with a central annular long boss a" and the
outer loose pulleys are mounted to rotate loose over same.
Referring to Figures 1 and 2 of these drawings; A is a shaft, a is the fixed
pulley keyed on the shaft A; and the pulley mounted to rotate loose on the
.shaft A.
The improvements consist in constructing the outer side rim flange or edge a b
of each fast and loose pulley a, b, much as usual or a little deeper, but in forming
the inner adjacent side flanges or edges a² ² of considerable less diameter, and with
a V or other shaped groove c¹ c' between the two flanges a¹² and 2 of each
pulley a, b, but closer to the inner flanges a², 12, for the band or rope e to grip in,
that is leaving an open space beyond the inner side flanges a², 2, and between the
outer side flanges a of the fast and loose pulleys a, b, fitted close together.
By this improved construction of pulleys the band or rope c can be very quickly
and with small power shifted from the fast to the loose pulleys and vice versa, as
"shown in sharp and dotted lines in Figure 1. The bands would preferably be
shifted on these improved pulleys a, b, by a belt fork which would give a combined
lifting or outward and lateral movement to instantaneously shift them from the
one pulley to the other. When a number of these improved driving pulleys a, b,
and ropes care mounted on one shaft A each fast pulley a would require a loose
pulley adjacent to it, with the short flanges & next it.
Referring to the arrangements shown in Figures 3 and 4 specially applicable for
driving in reverse directions with an open and cross driving band or rope c c
respectively, in this case the centre pulley a might be made with one deep centre
flange a', with a groove con cach side of it, and with short flanges a² on its outer
edges adjacent to the grooved pulleys on opposite sides of it, with low
flanges and grooves c' adjacent to the sides of the central pulley a, and
having high or deep rims &₁₁ on their outer edges. For this arrangement the
centre pulley a would preferably be the fixed pulley, with the loose pulleys bb
outside, so that a lifting and lateral shifting fork would preferably be used
separately for each band c or c² to put the one band into or out of action before the
other fork or band was moved to reverse the motion of the fast pulley; or the two
bands may be moved by a fork simultaneously, the one band e² being moved out
of its driving groove c', while the other band was being moved into its groove c'
of the fixed driving pulley a. If the outside pulleys are made the fixed pulleys,
then two centre loose pulleys would be required, as say divided up the dotted centre
- line in Figure 3.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is-
First. The constructing of combined fast and loose driving pulleys with short
adjacent edges or flanges, and longer outer flanges and forming rope grooves
between, substantially as and in the improved manner herein described in reference
to and by way of application shown on Sheet 1 of the accompanying drawings.
Second. The constructing of driving pulleys with a central fixed double grooved

page_text: pulley and outer loose grooved pulleys on each side of same, or vice versa, with short
adjacent edges or flanges and longer outer flanges, substantially as and in the
improved manner herein described in reference to and by way of application shown
on Sheet 2 of the accompanying drawings.
Dated the 2nd March 1892.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.