Improvements in and relating to Belt-driving Gear for Centrifugal and other Machines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Belt-driving Gear for Centrifugal
and other Machines.
We, ROBERT WILLIAMSON, of the Firm of Pott, Cassels and Williamson,
Engineers and Founders, Motherwell, in the County of Lanark, and CHARLES
ALPHONSO MATTHEY, of Russell Rise, Reading, in the County of Berks, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to frictional driving gear of the class referred to in
the Specification of Letters Patent No. 20256 of 1895, and it has for its object
to dispense with the use of clutch devices for throwing the driving and driven
shafts into and out of gear and otherwise to simplify the construction of the
gear and so arrange it that undue strain on the driving belt is avoided when the
machine is put in motion through the driving gear.
Under the invention the main or driving shaft is fitted with fast and loose
belt pulleys, and on it is keyed a radial arm or arms or a disc wherein is or are
fitted a block or blocks of wood or other material held in suitable guides but free
to slide radially. Two or more blocks are preferably used and their outer ends
bear on the inner periphery of a flanged disc or belt pulley which is loose upon
the shaft and from which the driven shaft is rotated, or the said disc or pulley
may be keyed on the driven shaft when in line with the driving shaft, in which
case the pulley acts as a friction coupling.
In the operation of the driving gear the main driving belt runs normally on
the loose pulley on the driving shaft, and when it is shifted on to the fast pulley
the disc or arm carrying the sliding friction blocks is rotated whereupon the
friction blocks are by centrifugal action forced outwards into frictional engage-
ment with the inner periphery of the flanged disc or belt pulley which transmits
the motion to the driven shaft.
The friction blocks may be of such weight or may be loaded so that any desired
extent of slip may take place before they take a firm grip of the periphery of
the disc or pulley, and thus slipping and straining of the belt on the fast pulley
is avoided.
1000

page_text: Improvements in and relating to Belt-driving Gear for Centrifugal
and other Machines.
We, IOBERT WILLIAMSON, of the Firm of Pott, Cassels and Williamson,
Engineers and Founders, Motherwell, in the County of Lanark, and CHARLES
ALPHONSO MATTHEY, of Russell Rise, Reading, in the County of Berks, 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 relates to frictional driving gear of the class referred to in
the Specification of Letters Patent No. 20256 of 1895, and it has for its object
to dispense with the use of clutch devices for throwing the driving and driven
shafts into and out of gear and otherwise to simplify the construction of the
gear and so arrange it that undue strain on the driving belt is avoided when the
machine is put in motion through the driving gear.
The invention is illustrated by the accompanying drawings Fig. 1 being an
end elevation and Fig. 2 a section on the line x-x of the improved driving gear.
Fig. 3 is a view similar to Fig. 2 of the driving gear as applied to drive a shaft
in line with the driving shaft.
Under the invention the main or driving shaft A is fitted with fast and loose
belt pulleys, B, C, and on it is keyed a radial arm or arms or a disc D; or this
disc may be formed on the keyed pulley as shewn, wherein is or are fitted a
block or blocks D¹ of wood or other material held in suitable guides D2 but free
to slide radially. Two or more blocks D₁ are preferably used and their outer
ends bear on the inner periphery of a flanged disc or belt pulley E which is loose
upon the shaft A as shewn at Figs. 1 and 2 and from which the driven shaft is
rotated, or the said disc or pulley E may be keyed on the driven shaft F when in
line with the driving shaft A. as in the example shewn at Fig. 3 in which case
the pulley E acts as a friction coupling.
In the operation of the driving gear the main driving belt H runs normally
on the loose pulley C on the driving shaft A, and when it is shifted on to the
pulley B the disc D or arm carrying the sliding friction blocks D¹ is rotated
whereupon the friction blocks D are by centrifugal action forced outwards into
frictional engagement with the inner periphery of the flanged disc or belt
pulley E which transmits the motion by means of a belt G to the driven shaft.
In some cases the shaft A may be stationary in which case the pulley B will
not be keyed to it.
The friction blocks I may be of such weight or may be loaded so that any
desired power may be transmitted and any desired extent of slip may take place
before they take a firm grip of the periphery of the disc or pulley E and thus
slipping or straining of the belts Hand G is avoided.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is: —
'
T
1. Belt-driving gear for centrifugal and other machines constructed and
arranged to operate substantially as described.
2. In belt-driving gear for centrifugal and other machines the combination
with belt pulleys on a shaft; of a disc or arms on said shaft and carrying blocks

page_text: adapted to engage with and rotate a power-transmitting pulley or shaft substan-
tially as described.
Dated this 11th day of July 1899.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents.
62, Saint Vincent Street, Glasgow, Agent for the Applicants.