Year: 1886

page_text: Date of Application, 14th Aug., 1886.
Complete Left, 25th Apr., 1887.
Complete Accepted, 27th May, 1887.
CHARLES DICKINS Engineer 14 Washington Street, Dublin, & HENRY IMRIE
Clerk 28 Mount Pleasant Square, Dublin, do hereby declare the nature of this
invention to be as follows:-
A method of transmitting Driving-Power under control by means of a single belt
suitable for working on Grooved Pulleys, direct from a fixed Pulley on driving shaft
to machinery.-On the shaft of machine to be driven, a pulley is fixed, on the boss of
which, or, alongside it on the said machine shaft, a smaller loose pulley is placed.-
The side of the fixed pulley presented to the loose pulley is recessed or hollowed out
to allow the loose pulley in part to run therein, without however touching the fast
pulley further than in the case of running on its boss. Just over, and around the said
recess, the fast pulley carries a slight shoulder bevelled off towards the circumference..
The loose pulley carries the belt from the driving shaft. It has one high flange, on
the off side from the fixed pulley, and the other Hange is cut or turned off to leave
just sufficient groove to guide the belt and to fit into the recess in the fixed pulley.-
Its normal position, controlled by the position of the pulley on the Driving Shaft &
the Belt therefrom, is to keep out of the recess.-A sido pressure by means of a lever
with fork or roller-contact, is brought to bear on the loose pulley, pushing it into tho
recess till the bevelled shoulder of the fixed pulley and the outer flange of, the loose
pulley form the working groove of the belt, thus practically making the two pulleys
one without their coming in contact, the regulation of the lever pressure giving any
desired partial transmission of speed.
3
101
A 1000
CHARLES DICKINS.
HY. IMRIE.

page_text: A Combination Fast and Loose Grooved Pulley for Transmitting
Power under Control.
We, CHARLES DICKINS, Engineer, 14 Washington Street, Dublin, & HENRY
IMRIE, Clerk, 12 Rugby Road-(lato of 28 Mount Pleasant Square) Dublin, 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:
The object of our invention is to provide an arrangement of Driving Pulleys for
machines whereby the transmission of spoed or power is under control at pleasure in
any degree of the motive power, and is obtained by the direct action of the driving
belt without the slackening and tightening of Belts or the intermedium of a friction-
disc as hitherto employed for the purpose.
We append drawings, in Figures 1, 2, & 3, of our said Combination and arrange-
ment which we now proceed to describe :-
A is a shaft, it may be a Machine-shaft or Counter-shaft to be driven, or the
Driving Shaft revolved by any convenient motor.
B is a pulley fixed on said shaft with a projecting bevelled side in which a circular
recess C is turned or cast, as shewn in imaginary profile by the dotted lines c c in
Figure 1, and in front view by Figure 2.
In the case of A being a counter shaft, B may be grooved or have a round or flat
face as suits the band connecting it with the machine.
D is another pulley, to run loose on the shaft A or on the boss of pulley B,-in
either case alongside pulley B on its recessed side.-This pulley D may be best
described as a deep-grooved pulley with its flange next to pulley B turned off to leave
just sufficient groove to guide a Band and to fit into the recess C to run clear therein
without touching pulley B except in the case of running on its boss.
In the case of A being the Driving Shaft, the pulley D carries a band connecting
it with the machine to be driven; and if A is the machine shaft or counter shaft D
carries a band connecting it with a fixed pulley on the Driving shaft or motor. By
the first of these arrangements, pulley D receives from pulley B and transmits to the
machine by means of the band, the power wanted, and in the second instance pulley
D receives from the Driving shaft its full speed and gives to pulley B the required
power, all in the manner herein after shewn.
We provide a shaft-collar F, with set-screw, to set pulley D so that it will not
emerge altogether from the recess C, and we control the position of pulley D further
by the position of the pulley that is fixed on the Driving shaft and the band carried
by D, or, by a small spiral spring fitting loosely on the shaft between B & D, so that
its normal position is to run close up to the said collar F, with its low flat flange just
entered in the recess C.

page_text: Figure 3 shows all as hereinbefore described in position, with a lever arrangemen
as, and for the purpose, hereinafter described.
We pivot a lever G, as at H, on the machine stand, or bench, or shaft-bracket, or
other suitable grounds, and connect it by a rod J with a treadlo-plate pivoted on floor-
brackets, by means of which lover pulley D is pushed along into the recess in
pulley B till the high flange of D and the bevelled side, or flange, of B combine to
form the working groove of the band E shown as carried by D,--and we have thus
the two pulleys made practically one through the medium of the said band, the
regulation of the lever pressure giving any desired partial combination and
consequent partial transmission of the initial power from the pulley in direct
connection with the Driving shaft to the other pulley in connection with the machine.
We provide the lever G with roller or fork contact where it acts on pulley D, and
its reciprocal arm to which the controlling rod J is connected, we fit with a brake to
act on pulley B in the case of said pulley B being on the machino shaft or counter
shaft, or to act on pulley D in the case of B being fixed on the Driving shaft, the
reversal of the foot pressure-(heel and toe)-on the treadle plate stopping the pulley
acted on simultaneously with the removal of the lever pressure.
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) The arrangement and Combination of the pulleys B and D substantially as herein
set forth.