Improvements in connection with Expansible Pulleys and similar Expansible Rotary Bodies.
Year: 1899

page_text: Date of Application, 21st Mar., 1898
Complete Specification Left, 15th Nov.. 1898-Accepted, 17th Dec., 1898
Improvements in connection with Expansible Pulleys and similar
Expansible Rotary Bodies.
I, PAUL SOHEGE, of 12, Avenue du Bois de Boulogne, Paris, in the Republic
of France, Engineer, do hereby declare the nature of my invention to be as
follows:
-
My invention relates to expansible pulleys and other expansible rotary bodies
the characteristic feature of my invention consisting of improved means for ad-
justing the movable parts of the rims of pulleys or outer moveable parts of other
etary bodies toward and away from their axis of rotation.
I will describe my invention as applied to an expansible pulley, from which
its application to other similar rotary bodies will be understood.
The rim or periphery of the pulley is made in parts and each part has a stem
fittel to slide radially in recesses in the boss or in arms or spokes projecting
radially from the boss of the pulley.
To the boss or the arms projecting therefrom is attached or formed in one
therewith a toothed wheel with which gears a pinion or wheels mounted loosely
on a stud carried on the shaft onto which the expansible pulley is fixed. On
this stud is loosely mounted another pinion or wheel which gears with a wheel,
toothed ring or plate having on the opposite side to that having the teeth, a
spiral rib or projection engaging in notches formed on the several stems pro-
jecting radially from sections of the pulley.
On the shaft carrying the pulley are also loosely mounted two toothed wheels
which gear with the wheels mounted loosely on the stud hereinbefore referred to
means being provided for preventing and permitting the rotation of these wheels.
The outer one of the two pinions or wheels on the before mentioned stud gears
with the wheel on the boss of the pulley and with the larger one of the two
wheels loosely mounted on the shaft, whilst the inner one of the said two pinions
or wheels on the said stud, gears with the toothed wheel, ring or plate before
referred to, and also with the smaller wheel of those mounted loosely on the
shaft.
The wheel plate or ring having the spiral rib or projection is adapted to turn
in a bearing, provided on the boss or arms of the pulley.
When the pulley is rotated while the wheels mounted loosely on the shaft
are held motionless, the stud will be caused by the outer wheel on the stud, to
rotate at a speed equal to one half the speed, at which the pulley rotates, because
the said wheel on the stud gears, on the one hand, with the wheel on the boss
of the pulley and on the other hand, with the larger one of the loosely mounted
wheels on the shaft and which is motionless; and by the rotation of the stud
round the shaft the inner wheel on the stud is caused to rotate on the said
stud owing to its gearing with the smaller of the motionless loosely mounted
wheel on the axle, and by gearing with the wheel ring or plate having the spiral

page_text: rib or projection cause the said ring or plate to turn at the same ratio of speed
as the pulley.
On imparting a rotary movement to the smaller loosely mounted wheel on the
shaft while the larger wheel is motionless, the ring or plate with the spiral rib
will be caused by the inner pinion on the stud gearing therewith to turn in its
bearing in the pulley in the reverse direction to that of the said smaller wheel
on the shaft and by the engagement of the spiral rib with the notches in the stem
of the pulley sections, will be forced outwards or inwards and so increase or
decrease the diameter of the pulley, according to the direction in which the
ring or plate is rotated.
The same effect will be produced, if the smaller of the loosely mounted wheels
on the shaft is prevented from rotating, and the larger one of the said wheels
be rotated, as by the rotation of this wheel the outer wheel on the stud will be
rotated and no longer present the ratio of ½ speed relatively to the pulley, and
will, through the inner pinion on the stud transmit the difference of speed to
the spirally ribbed plate so that the same result as that hereinbefore described
is obtained.
1
LT
01
f Mol 1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C.,
Agents.
Improvements in connection with Expansible Pulleys and similar
Expansible Rotary Bodies.
I, PAUL SOHEGE, of 12, Avenue du Bois de Boulogne, Paris, in the Republic
of France, 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:--
My invention relates to expansible pulleys and other expansible rotary bodies,
the characteristic feature of my invention consisting of improved means for ad-
justing the movable parts of the rims of pulleys or outer movable parts of other
rotary bodies toward and away tem their axes of rotation.
I will describe my invention with reference to the accompanying drawing as
applied to an expansible pulley, from which its application to other similar
rotary bodies will be understood. The drawing represents in section one half
of an expansible pulley provided with my improved adjusting mechanism.
1 is the shaft on which the pulley is mounted. The pulley is provided with
a rim 3 made in parts, each part having a stem fitted to slide radially in recesses
in the body or in spokes projecting radially from the boss of the pulley. Con-
nected to or formed in one with the body or with the spokes A of the pulley
is a toothed wheel A¹ with which gears a pinion or wheel mounted loosely
on a stud K carried on the shaft 1 on which the pulley is fixed. On this stud 18
loosely mounted another pinion or wheel D gearing with a wheel, toothed ring
or plate B having on the opposite side to that having the teeth, a spiral rib or
projection B engaging in notches B32 formed in the several stems 2, projecting
radially from the sections 3 of the pulley;
On the shaft carrying the pulley are also loosely mounted two toothed wheels E
and which gear respectively with the wheels D and Cmounted loosely on the
stud K, hereinbefore referred to, means being provided for preventing and per-
mitting the rotation of the wheels E and F as required.

page_text: The toothed plate or ring B having the spiral rib or projection B¹ is adapted
to turn in a bearing a provided on the body or spokes A of the pulley.
When the pulley is rotated, while the wheels E and F are held motionless,
the stud K, will be caused, by the outer wheel C on the stud, to rotate on the
shaft 1 at a speed equal to one half the speed at which the pulley rotates,
because the said wheel C gears, on the one hand, with the wheel A of the pulley,
and, on the other hand, with the larger one, F, of the loosely mounted wheels E F
on the shaft 1 which are motionless, and by the rotation of the stud K round
the shaft 1 the inner wheel D on the stud is caused to rotate on the said stud
owing to its gearing with the smaller motionless wheel E on the axle 1, and by
gearing with the ring or plate B having the spiral rib or projection cause the
said ring or plate to turn at the same ratio of speed as the pulley.
On imparting a rotary movement to the smaller loosely mounted wheel E on
the shaft 1 while the larger wheel is held motionless, the ring or plate B with
the spiral rib B¹ will be caused, by the wheel D, on the stud, gearing therewith,
to turn in its bearing in the pulley in the reverse direction to that of the wheel E
and by the engagement of the spiral rib B¹ with the notches in the stems of the
pulley sections will be forced outwards or inwards and so increase or decrease
the diameter of the pulley according to the direction in which the shaft 1 is
rotated.
The same effect will be produced if the smaller loosely mounted wheel E be
prevented from rotating and the larger wheel F be free to rotate, as by the
rotation of this wheel the outer wheel C on the stud will be rotated and no longer
present the ratio of speed relatively to the pulley and will, through the
wheel D), which will roll round the wheel E, transmit the difference of speed to
the spirally ribbed and toothed plate B so that the same result as that herein-
before described is obtained.
Having now particularly described and ascertained the nature of this in-
vention and in what manner the same is to be performed, I declare that what
I claim is:-
1. Means for varying the diameter of expansible pulleys and other expansible
rotary bodies, characterised by sliding arms or stems carrying segments of the
rim or expansible portion of the pulley or the like; notches in the sliding arms
or stems; a ring or plate provided with a spiral rib engaging the notches in
the arms or stems, and means for imparting rotation from the pulley or the like
to the ring or plate so as to cause the arms or stems carrying the segments of
the rim of the pulley or the like to move nearer to or further from the axis of
the said pulley or the like, substantially as hereinbefore described.
2. The combination of parts constituting means for varying as required the
diameter of pulleys or other expansible rotary bodies, substantially as herein-
before describe with reference to the accompanying drawing.
1411
Swaban 1808
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.