Improvements in Variable Speed Gearing.
Year: 1889

page_text: Date of Application, 6th Aug., 1889
Complete Specification Left, 6th May, 1890-Accepted, 19th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Variable Speed Gearing.
I, JOSEPH LEOPOLD HUBER, of 34 Branerstrasse Hamburg, in the Empire of
Germany, Engineer, do hereby declare the nature of this invention to be as
follows:
The apparatus constructed according to this invention is designed for connecting
shafts so as to drive machinery with a varying expenditure of power, by increasing or
decreasing the speed in the transmission.
My said apparatus comprises a belt pulley which is firmly connected with a toothed
wheel, and is adapted to turn with the latter loosely upon its shaft. Upon the nave
of this pulley is movably arranged a brake pulley which is provided with a rim
extending over a grooved collar on the said beli-pulley and which has a pin carrying
a small spur-wheel. The teeth of this wheel are simultaneously in gear with the
internal teeth of a wheel which is fixed upon its shaft and with the teeth of another
wheel which is loose on the shaft. In suitable openings formed in the aforesaid rim
on the brake-pulley are provided brake claws or pawls which are pivoted on pins.
The inner arm of these claws or pawls is pressed into the above-mentioned grooved
collar on the driven pulley under the action of springs whereas the outer arm of the
claws or pawls projects from the said brake pulley, and comes in contact with the
brake-blocks or the brake-band when the brake is applied.
As long as the brake-band is not applied the above-mentioned belt-pulley and brake
pulley are coupled together, because in the turning movement of the same in one or
the other direction one or the other of the brake claws or pawls, being pivotted excen-
trically will be pressed into the groove in the aforesaid collar with a power that is
proportional to the resistance. This arrangement enables the wheel secured to the
belt pulley to be firmly coupled to the wheel carried by the pin on the said brake-
pulley, the latter wheel being prevented by the former from turning. The wheel
having internal teeth is consequently also fixed relatively to the wheel on the pin of
the brake pulley and is therefore carried away at the full speed of the aforesaid belt-
pulley.
If now by means of a bell-crank lever or the like the said brake-band is applied
against the brake-pulley, this pulley will be fixed while the grooved collar on the belt-
pulley is liberated from the brake claws or pawls, because the brake band will cause
the arm protruding from the periphery of the pulley to move into the interior of the
rim on the brake pulley and the opposite arm is raised from the grooved collar on the
belt pulley.
The rotary movement of the said beli-pulley is now transmitted by the toothed
wheel connected therewith to the wheel adapted to turn upon the pin on the brake
pulley which pin is now fixed, and then to the internally toothed wheel and its shaft
at a speed which must be in proportion to the diameter of the pitch-circles of the
wheel connected with the belt pulley and that of the said internally toothed wheel.
This movement which is thus transmitted to the latter wheel through the medium of a
single intermediate wheel takes place in the opposite direction to that of the said belt-
pulley. If therefore the latter and the internally toothed wheel are to revolve in the
same direction the movement of the wheel carried by the pin on the brake-pulley
must not be transmitted directly, as it is necessary to include a second intermediate
wheel.
Instead of at one point, the power can of course be transmitted from the toothed
wheel connected with the belt-pulley at several points, and on this depends the number
of the intermediate wheels or pairs of wheels; or in lieu of toothed wheels use can
be made of friction pulleys; and the belt pulley can be keyed upon the shaft whilst

page_text: the internally toothed wheel can be arranged to turn upon its shaft. The part which
receives the power or is driven need not necessarily be placed upon the same or a
conaxial shaft as the driving part, for example the driven wheel may be arranged upon
a shaft which is parallel to that on which the belt-pulley is placed, and may engage by
means of external teeth with one of the intermediate wheels, without departing from
the nature of this invention.
Dated this 6th day of August 1889
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.

page_text: coupled to the wheel i carried by the pin h on the said brake-pulley the latter wheel
being prevented by the former from turning. The wheel k, having internal teeth, is
consequently also fixed relatively to the wheel on the pin of the brake pulley f and
is therefore carried away at the full speed of the aforesaid belt-pulley a. If now by
means of a bell-crank lever q or the like the said brake band p is applied against the
brake-pulley ff, this pulley will be fixed while the grooved collar g on the belt
pulleya is liberated from the brake claws or pawls m, because the brake band will
cause the arm protruding from the periphery of the pulley to move into the interior
of the rim and the opposite arm is raised from the grooved collar g of the belt
pulley a. The rotary movement of the said belt pulley a is now transmitted by the
toothed wheel connected therewith to the wheel i, adapted to turn upon the pin h
on the brake-pulley which pin is now fixed together with the band-pulley and
then to the internally toothed wheel and its shaft c at a speed which must be in
proportion to the diameter of the pitch-circles of the wheel b, connected with the belt
pulley a and that of the said internally toothed wheel k.
This movement, which is thus transmitted to the latter wheel through the medium
of a single intermediate wheel i, takes place in the opposite direction to that of the
said belt-pulley a. If, therefore, the latter and the internally-toothed wheel are to
revolve in the same direction, the movement of the wheel i, carried by the pin 4, on
the brake-pulley must not be transmitted directly, as it is necessary to include a
second intermediate wheel r Fig. 7.
Instead of at one point, the power can of course be transmitted from the toothed
wheel connected with the belt pulleya at several points, and on this depends the
number of the intermediate wheels or pairs of wheels or in lieu of toothed wheels
use can be made of friction pulleys, and the belt-pulley can be keyed upon the shaft
while the internally-toothed wheel can be arranged to turn upon its shaft.
Instead of using the brake pawls m herein before described I sometimes make use
of friction wedges m² (Figure 9) held in opposite directions between the collar g and
brake-pulleyso that when the pulley a turns in one or the other directions one
or the other series of these wedges are caused to act upon the pulleys which are
thus connected. Between each pair of these friction wedges m' m' engages a guide.
block with its wedge-shaped end, the other part of which is guided radially in the
rim f of the pulley and it projects from the latter to come in contact with the
brake-band p. As soon as the brake-band p is applied these guide blocks n¹ are
simultaneously forced between the ends of the wedges m' which are thereby
disengaged.
Instead of these wedges I may also use an endless brake band m² (Figure 10) to connect
the pulleys a and f. For this reason the brake-band m² is guided over an eccentric t
being journalled at in the rim of the pulley and connected to a shoe it.
When the pulley a is rotated, in the direction of the arrow (Fig. 10) and the brake-
band is not applied against the brake-pulley, the endless band m³ is caused by
reason of its contact with the rim or collar g to turn the eccentric t so that the
band is stretched and the pulleys a and connected together, while the shoe
simultaneously turned so that one end of the same projects from the rim f¹. But as
soon as the brake-band p is then applied against the pulley ff' the latter is at the
same time disconnected from the band pulley a and instantaneously arrested, so that
the latter may freely rotate within the endless brake-band m².
is
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
First. In a variable speed gearing the pulley, provided with a rim or collar and
the brake-pulley having brake-claws or pawls or their equivalents for effecting a
connection or contact with said rim, substantially as set forth.
Second. In a variable speed gearing the pulley herein described provided with a
rim or collar the brake-pulley having brake-pawls m or wedges m' or an eccentrically

page_text: guided endless brake band m³ engaging said rim, and the brake-band p encircling
Said brake-pulley for operating said pawls or the like, substantially as set forth.
Third. In a variable speed gearing the pulley herein described, provided with a
collar or grooved portion, the brake-pulley having brake-claws or pawls pivotally
secured therein and engaging said grooved portion or collar the spring bearing
against said claws or pawls, and the brake band for operating the latter, substantially
as set forth.
Fourth. In an apparatus for connecting shafts by variable speed gearing the pulley
herein described loose upon its shaft and having a gear-wheel connected thereto also
loose upon said shaft, the brake-wheel having contact with said pulley, the wheel k
and the wheel connection between said gear-wheel & and the gear-wheel substantially
as set forth.
Fifth. In apparatus for connecting shafts by variable speed gearing the pulley
herein described, loose upon its shaft, and having a gear-wheel connected thereto,
also loose upon said shaft the brake-wheel having contact with said pulley the gear
wheel secured to said brake wheel and the wheel provided with internal teeth
engaging said latter gear-wheel substantially as set forth.
Sixth. The herein described improvement in variable speed gearing comprising
the pulley loose on its shaft and provided with a rim or collar the brake wheel
having claws or pawls engaging said rim or collar the brake band for operating said
claws or pawls the gear-wheel b, secured to said pulley and also loose upon said
shaft the gear wheel secured to said brake-wheel, and the internally toothed wheel k
substantially as set forth.
g
Seventh. In variable speed gearing the pulley a, provided with a rim or collar
the brake wheel having brake wedges m m engaging said rims or collar and the
brake 6 and for operating by air or guide blocks n n said wedges substantially as
set forth.
Eighth. In variable speed gearing the pulley a, with a ring or collar 9, the brake-
wheel the endless brake band m encircling the ring or collar and an eccentric t
pivoted within the rim of the brake wheel, and the brake-band for operating by aid
of a shoe connected to the eccentric said endless brake-band m² substantially as
set forth.
Cal 1
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HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.