Differential Gearing to Alter the Speed of Machinery.
Year: 1885

page_text: Differential Gearing to Alter the Speed of Machinery.
I LORENTZ ALBERT GROTH K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of said invention for "IMPROVEMENTS IN CURBS OR CHECKS
APPLIED TO A DIFFERENTIAL MOVEMENT OR PULLEY TO ALTER THE SPEED OF
ور
MACHINERỲ a communication to me from abroad by Paolo Rolla and Carlo
Gaetano Rolla Gentlemen of Genova in the Kingdom of Italy to be as follows:-
The object of this invention is to regulate the speed of any machine from the
spot by curbs or brakes acting on the loose parts of a differential pulley.
A differential pulley with cog wheels is substituted for the ordinary one and by
means of the curb the speed is altered at will.
Any shape and dimensions may be used the principle remaining the same
whatever proportions are given to the different parts while the belt may be placed
on the side instead of in the centre by altering the exterior figure.
The driving pulley running loose upon its shaft carries on an arın a bevil wheel
gearing with two other bevil wheels one on each side of the pulley. One of these
latter wheels is keyed to the shaft to be driven the other runs loose upon the same,
and has a brake wheel cast with it running at the side of another brake wheel
keyed to the shaft The motion imparted by the driving pulley to the shaft can
thus be regulated by the application of the brakes.
The check or brake which can be operated by a pedal presses on one or other of
the brake wheels and is held by a spring which when released stops the machine.
This apparatus almost takes the place of a regulator and will be very useful for
stopping winding and other machines without any of the shock that are so
dangerous to machinery.
Dated thin
C
1 1007

page_text: improvements in Curbs or brakes Appшed to a runey WITH
Differential Gearing to Alter the Speed of Machinery.
I LORENTZ ALBERT GROTH K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of my said invention for "IMPROVEMENTS IN CURBS OR BRAKES,
APPLIED TO A PULLEY WITH DIFFERENTIAL GEARING TO ALTER THE SPEED OF
"
MACHINERY a communication to me from abroad by Paolo Rolla, and Carlo
Gaetano Rolla, Gentlemen of Genova in the Kingdom of Italy, and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
Fig. 1. shows a longitudinal sectional elevation of said differential pulley and
brake.
Fig. 2. shows a lateral view of the same.
Figs. 3 and 4 show respectively elevations of modified forms of brake.
The object of this invention is to regulate the speed of any machine from the
spot by curbs or brakes acting on the loose parts of a differential pulley.
A differential pulley with cog wheels is substituted for the ordinary one and by
means of the curb or brake the speed is altered at will.
Any shape and dimensions may be used the principle remaining the same
whatever proportions are given to the different parts, while the belt may be placed
on the side instead of in the centre by altering the exterior figure.
The Driving pulley D Fig. 1 running loose upon its shaft T carries on its arm e,
a bevil wheel c, gearing with two other bevil wheels a and b, one at each side of
the driving pulley D. One of these latter wheels a with safety shield A is keyed
to the shaft T; the other b with safety shield B runs loose upon the shaft and has
a brake wheel B' cast with it, running at the side of another brake wheel A² keyed
to the shaft T.
The motion imparted by the driving pulley to the machines, can be regulated by
the application of the brakes in the following way.
If the brake f be applied to the brake wheel B2, it and its corresponding bevil
wheel b will be retarded, thus causing the central bevil wheel c to revolve on the
arme which carries it round the shaft, and increasing the rotation of the bevil
wheel a and shield A, and therefore (by means of the shaft to which it is keyed of
the brake wheel A2, in proportion to the retention of the brake wheel B". Inversely
the application of the brake g to the brake wheel A° will increase the speed of the
brake wheel B' in like manner.
The Dachines are driven from these brake wheels by belts or straps the brakes
being applied to the under side so as not to interfere with its working.
The brake consists of a vertical rod with a short crosshead, to the opposite ends
of which are attached the curved brake rods g and f, the other ends of which are
supported on the arms of a stirrup on a vertical support. The vertical rod may be
moved to the right or left to apply, or withdraw, either of the brakes, by means of
a pedal or other suitable arrangement and is held by a flat spring m Fig. 2.

page_text: Figs. 3 and 4 each show a modification of the brake in both of which the act of
applying one withdraws the other.
By means of this apparatus it is possible to regulate the speed of machines as
required by the application of one or other of the brakes, and can be stopped
without any injurious shock while the system can be applied to any existing
arrangement.
The apparatus can be applied either direct to the machine or entirely independant
of it and the motor.
When applied direct, it is advisable to use a special system of brake constructed
so as not to produce friction on the main shaft to absorb power.
Fig. 3 shows on of these brakes; pivoted in p and when operated by any kind
of lever system apply friction to two opposite points of the pulley by means of the
two friction springs a and b this friction locks the pulley as in a vice and thus
stops it without absorbing any power from the shaft.
When the apparatus is applied independant of the machine and the motor and it
is not necessary that the brakes should act upon the two extremities of a diameter,
the brake can act on a single point of the periphery of the pulley as shown in
Fig. 4 in which case the friction does not absorb any power from the motor.
this case the apparatus is mounted on a fixed frame D D carrying two parts acting
as guides for the brakes.
In
It has a continual rotation by means of the belt pulley B. whict it transmits by
means of the pulley A¹ united with the friction pulley A2 and gear wheel A³.
C is another friction pulley united with C¹ o is the axle passing through the
apparatus and secured by the nut i. P is a rod or lever by which the brakes F F
are applied while q is a spring to release them when the hand is withdrawn from
the lever P.
When the brakes are not applied both parts of the pulley revolve at equal speed
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 :-
The differential pulley, consisting of driving pulley D with central bevil wheel c
on its arm e gearing with bevil wheels a (keyed to shaft T) and b running loose on
same, in connection with brake wheel B2 cast with bevil wheel b, and brake
wheel A keyed on to shaft T; controlled by brake rods g and f on rod h or
any other suitable brake which while stopping one wheel releases the other, for
the purpose of regulating the speed of machinery, as herein before described and
illustrated in the drawings.