Improvements in Friction Driving Gear.
Year: 1893

page_text: Date of Application, 16th Sept., 1893
Complete Specification Left, 18th June, 1894-Accepted, 18th Aug., 1894
TRUVIDIONAL SPECIFICATION.
[Communicated from abroad by FRANÇOIS SINGRE, of 47, Boulevard Barbés, and
ANDRÉ FRANÇOIS PARIS, of 90, Faubourg Saint Martin, both in Paris,
France, Engineers.]
Improvements in Friction Driving Gear.
I, HENRY HARINGTON LEIGH, Assoc. M. Inst. C.E., Fel. Ch. Inst. P.A.,
F.I. Inst., practising as Phillips and Leigh at 22 Southampton Buildings, Chancery
Lane, in the Administrative County of London, Engineer and Patent Agent, do
hereby declare the nature of this invention to be as follows :—
The methods of transmitting power by frictional contact which have hitherto
been used are characterised by sundry drawbacks, the most important of which is
the absorption and consequent loss by friction at the bearings, of a certain
quantity of the power to be transmitted. The cause of the said friction is the
degree of adhesion between the pulley faces, which it has been necessary to
maintain.
The object of the present invention is to produce the necessary adhesion without
sensible reaction at the bearings.
In any frictional driving gear there are present a driver and a driven, the latter
receiving its motion from the former because of their adhesion along the line of
contact. The present invention combines with such frictional driving the following
arrangements and devices.
1. A second pulley, loose if required, the centre of which is situated upon the
prolongation of the line which joins the centres of the driver and driven.
2. Moveable bearings adapted to provide for a slight displacement along the line
of the three centres. These bearings are applied to the two pulleys.
3. An elastic band surrounding them all and adapted thereby to hold them with
their peripheries in contact..
0
4. Where an electrical current is available, metallic strengthening pieces are fitted
to the axles so as to form magnetic masses. Pole pieces are placed in proper
position thereto for exercising magnetic attraction upon the said masses so as to
effect the necessary approximation of the axles.
The band above mentioned may be made in either of two ways, according to
power to be transmitted. The simplest form is an endless band of rubber or other
similar material adapted to draw the friction surfaces together. But when a higher
power has to be transmitted, the band must be strengthened. It then consists of
an outside band of metal or other rigid material, lined on its inner face with a
band of rubber, leather or other compressible material. The compressibility of
the lining provides a sufficient degree of elasticity to the belt in the direction of
its length.
Instead of two pulleys, one on each side of the pulley or shaft to be driven, three
may be placed at the angles of a triangle, all being held to the driven by a band in
the way above described.
Dated this 16th day of September 1893.

page_text: I, HENRY HARINGTON LEIGH, Assoc. M. Inst. C.E., Fel. Ch. Inst. P.A.,
F.1. Inst., practising as Phillips and Leigh at 22 Southampton Buildings, Chancery
Lane, in the Administrative County of London, Engineer and Patent Agent, 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 :-
Transmission of power by the contact of friction pulleys or cylinders has always
presented various inconveniences, the greatest of which is the absorption, and
consequently the loss, of a certain quantity of the transmitted power, by the
friction of the pulley axles in their bearings, this being a consequence of the strain
which the parts are placed under in order to produce the adherence of frictional
contact.
The object of the present invention is to produce the necessary adherence or
frictional contact or connection between the pulleys or cylinders and to abolish all
frictional resistance in the bearings.
It is no secret that several inventors have endeavoured to accomplish the same
object but by different and very inferior means. I claim to be the true and first
inventor within this realm of the bereinafter specified elastic locking which
produces adherence or connection and permits of a momentary separation of the
pulleys in contact if dust or foreign matters should by chance fall between them.
Further, I claim to be the true and first inventor within this realm of the herein-
after specified elastic locking of surfaces in contact, characterised by the absence
of wedging and gripping and by an equilibrium of all the pressures produced, such
equilibrium being mathematical and perfect and avoiding all loss of work between
the axles of the cylinders and pulleys.
In all cases of transmission of movement by contact, there is one pulley and one
cylinder, one of which imparts movement to the other by the adherence or friction
at their line of contact. The present invention adds (a.) a counter-cylinder or
pulley and (b.) means for the elastic locking of the contact pulleys to the same.
The means for producing that locking may vary considerably and I will describe
a few of them; it being understood that I do not limit myself in any respect to
any particular means shown. All systems in which the transmission of movement
by the contact of two pulleys or cylinders is completed by a counter-cylinder or
pulley and by suitable means producing an elastic locking of the several pulleys
or cylinders while equalizing and easing the pressures on the axles, fall within the
scope of my invention.
Referring to the accompanying drawings,
Figure is a side view of the simplest form of my invention.
Figure 11 is a sectional view of the same:
Figures III and IV are views similar to 1 and 2 of a modification :
Figures V and VI show in elevation and plan (partly in section) a dynamo
adapted to drive the pulleys and to maintain them in frictional contact:
Figures VII and VIII are views of modifications of Figures 5 and 6:
Figure 1X is a side view of a lever system for holding the pulleys in contact:
Figure X shows the pulleys within a ring:
Figure XI is a sectional view of Figure X:
Figures XII to XVI show details of yielding counter pulleys.
Figures XVII and XVIII are views similar to X and X1 of modifications

page_text: Figure XIX is a sectional view or another modification.
Figure XX is a sectional view of a planetary system.
Figures XXI to XXVI are views of other modifications showing cone pulleys.
1st Example. Figure I is an elevation, and Figure II a horizontal sectional view
on the line a-b of Figure I.
1 and 2 are two pulleys or cylinders one of which must impart motion to the
other by contact; 3 is the counter pulley loose on its axis, if necessary. 2 is
mounted in an ordinary fixed bearing, while 1 and 3 revolve in two movable
bearings 4 and 5. By this arrangement the bearings 4 and 5 can move slightly
in the line of the three centres. It is only as an example that I have shown 1
and 3 mounted in movable bearings. Either two of the axles of 1, 2 or 3 can
be mounted in movable bearings; the effect will be the same.
A strap 6 of
elastic material serves to connect the two pulleys by surrounding them and, as
it were, joining them so that they move uniformly as one apparatus. The strap 6
that produces the locking together of the contact pulleys does not lose therefore
the function which strap discharges in the case of ordinary transmission pulleys,
as it transmits the action of oue pulley to the other uniformly.
2nd Example. Figures 11I and IV represent a similar system. The only
difference is that three pulleys 7, 8 and 9 are put in contact with the cylinder 2
instead of the two pulleys as in the former example. One of the axles only
turns in a inovable bearing. The same device can be applied to a larger number
of pulleys.
3rd Example. The connection is not produced in this instance by a strap of
elastic material but by means of an exterior ribbon of metal, or other rigid material,
lined along its inner face with rubber, felt, leather, or some other compressible
material. The compressibility of the said lining assures a sufficient elasticity
longitudinally of the endless strap. This modification being clear, has not been
illustrated in the figures.
4th Example. The same elastic locking connection may be obtained by a covering
extending the entire periphery of the pulleys or cylinders, which covering consists
of rubber, felt, leather or other compressible material, and with this I use a
ribbon of metal or other rigid material extending about the pulleys as endless
connecting band.
In the four preceding examples as well as in some of the following, I have
shown cylindrical pulleys, that is pulleys with a flat face, but it will be understood
that the clastic locking or connection can easily be applied to pulleys with one or
more grooves producing a wedged friction. It will simply be required to modify
the section of either the flexible strap or of the other Hexible organs.
5th Example. It is possible to obtain the elastic locking or connection without
any mechanical device, by physical power, more especially by magnetic attraction.
By utilizing the energy of the induction of a dynamo (see Figures V and VI),
I proceed as follows. The axles 10 and 11 receive their notion from the
cylinder 12 keyed upon the axle of the armature. This is effected by means of the
locking or pressing of the clastic strap 6 upon the wheels 13 and 14, which locks
or holds the same in contact with the driver 12. The axles 10, 11 turn in bearings
which slide in brackets 10*, 11*, and these sliding hearings are prevented from
leaving the slotted brackets by the links 10, 11° connected pivotally to the ends
of the axles and to the disc 11° on the end of the dynamo shaft.
The axles 10 and 11 carry the magnetic masses 15 and 16 placed in front of the
pole pieces 10, 11, yet without touching the same, and at the other extremity
they end in two cylinders 17 and 18 which are in contact with the wheel 19. The
wheel 19 is fixed upon a shaft 20 mounted on the prolongation of the axle of the
dynamo. The cylinders 17 and 18 are maintained in contact with their
corresponding pulley 19 by means of a second strap 21 mounted upon the
pulleys 22 and 23 on the shafts 10 and 11. Thus obtain by the aid of the first
elastic strap 6 mounted upon the pulleys 13 and 14 and the driving cylinder 12, a
first transmission of the motion, and then, by the means of the second strap 21

page_text: mounted upon the pulleys 22 and 23, I obtain a second transmission from the
shafts 10 and 11 to the shaft 20, the elastic straps together with the magnetic
attraction of the pole pieces serving to keep the parts in frictional contact and
in equilibrium. Where the work to be done is light, the elastic straps 6 and 21
may be omitted and the parts held in frictional contact by the attraction between
10 15 and 11-16.
6th Example. In this case the elastic locking or frictional contact is obtained by
solenoids through which runs the current of the dynamo or of some other
generator of electricity. Figures VII and VIII show the application of the
system to a dynamo machine of the Manchester type. It consists of the shafts 24
and 25 upon which the solenoids 26 and 27 are mounted. These shafts may move
towards or from each other by means of the sliding bearings 29* 30*. These
shafts receive their motion from the cylinder 28, fixed upon the axle of the dynamo
and they transmit the same to the cylinders 29 and 30 that are in contact with the
wheel 31 mounted upon the shaft 32 situated on the prolongation of the axle of the
dynamo, said shaft 32 being the part to be driven.
A single strap 6 mounted upon the two rollers 33 and 34, fixed upon the
wheels 35 and 36 assures the mechanical locking or frictional contact of the pulleys
upon the driving cylinder 28 the shafts 24, 25 being thus freed from frictional
strain. An electric current sent by means of the friction pieces 37, 38, 39, 40,
passes through each of the solenoids and produces a closed magnetic circuit between
the shafts 24 and 25, the pulleys and the cylinders increasing the contact of those
pieces, the magnetic attraction augmenting the holding effect of the strap 6. The
brackets located at the extremities of the shafts are slotted so as to allow the parts
to be drawn together.
7th Example. The elastic locking or frictional connection is here effected by
an engaging and disengaging arrangement illustrated by Figure 1X. Two
pulleys and 3 and a cylinder 2 are in contact.
1 and 3 revolve in movable
bearings and their axles are eccentrically connected to the axle of the cylinder 2
by the connecting rods 41 and 42. In the figures, I have shown the pulleys
mounted upon movable bearings 43 and 44. It is however evident that either two
of the three shafts may be located in movable bearings while the third remains
fixed. A lever mounted upon the fixed shaft locks the pulleys elastically the one
against the other by moving said lever in the direction of the arrow. The lever
can be actuated either by hand, or by a spring or by a counter weight 45.
This improved system of elastic locking may be used alone in the case where the
wheels 1 and 3, either by their own weight or by the pull or pressure on them,
exert upon their bearings, pressures which are considerable as compared with the
elastic pressure which must be developed to produce the adherence or connection
necessary for rotation. It will be perceived from the diagram of strains upon the
shafts that the resultant R is evidently equal to P since N is very small.
Consequently, it is advantageous to use this locking alone when the loss of work
resulting from R-P gives a friction less than the stiffness of the strap 6 acting
upon the wheels 1 and 3 or upon the smaller wheels mounted upon the same axles
as illustrated in Figure IX, to produce the elastic locking automatically.
This system may also and with as much advantage be used in combination with
the elastic locking of the strap O to ensure the starting of the wheels 1 and 3 in
the acts of engagement or of disengagement. It is a powerful auxiliary in apparatus
for hoisting or hauling or in those which work intermittently.
In this system, the arrangement of the levers and rods must be such that the
elastic locking can always be obtained normally that is say without any wedging of
the members, in order that there never shall be any gripping together of the surfaces
in contact, which might stop the motion and cause accidents.
8th Example. This arrangement differs from the preceding constructions, in the
first place by the arrangement of the contact cylinders which do not come in
contact externally but one of which surrounds the system of pulleys by its interior
wall, and secondly, by the use of concentric shafts. Figure X shows a vertical

page_text: section on ry; and Figure XI, a horizontal section on w- of such a construction.
A cylinder 47 is fixed upon the shaft 46 which must impart to, or receive motion
from, the inner face of the cylinder 48 fixed upon the hollow shaft 49.- On the
line wo, two parallel shafts are mounted in movable bearings. Two pulleys 50
and 51 are fixed upon these shafts which are in contact with the wheel 48 and
the cylinder 47.
The central cylinder is fitted with a compressible covering pressed between two
blocks 52 and 53 by means of a screw and nut 54. The object of the said covering
is to force away the pulleys 50 and 51 from the centre of the system and to press
the same against the interior wall of the cylinder 48. The elastic locking or
frictional contact is regulated at pleasure by adjusting the nut 54.
The compressible cylinder may be constructed in many ways, different from the
one already specified.
The extensible covering may consist of leather, rubber, linen, rope, or of any
other compressible and appropriate material. It may be divided in several parts
separated the one from the other by plates of various shapes (Figures XIV and XV).
It may be surrounded by a thin and extensible sheet of metal, leather, linen,
rubber, or their equivalent (Figure XIII) or by a thin metallic band forming
a spiral spring, the two extremities of which are fixed to the two compressing
blocks 55 Figure XII.
་
It will be possible also to dispense with all fittings inside the cylinder 37 and to
use only the spiral spring 56 already spoken of (Figure XII-56) as it is evident
that the drawing together of the compressing blocks bends the spirals of the spring
towards the outside and compels them to lock the surrounding pulleys elastically.
The compressing blocks may be pushed into the interior of the cylinders permanently
by the effort of internal springs of which one extremity is fixed upon the axle,
the other acting upon the surface of the block, so as to obtain an automatic
locking see Figure XVI.
The rigidity of the spiral spring 551-Figure XVI-may, when heavy work has
to be done, be increased without sacrificing its elasticity, by giving to the spirals,
a rectangular section very long in the direction of the radius of the cylinder and
very narrow in the direction of the generatrices of the latter, and by filling up the
spaces between the spirals 56', with compressible and elastic matter, such as leather,
rubber, cloth or any other analogous material. The effect of this filling in
combination with the metallic spirals, is to form a compact cylindrical body of great
elasticity, made automatic by compression, and mounted above the compressing
surface in order to exert great efforts tangentially. This filling, by its composition,
has the effect of increasing the adhesion of the generatrices in contact.
The space
between the filling and the shaft on the one hand, and between the two compressing
blocks on the other part, is filled with some clastic and compressible substance 57¹.
9th Example. The Figures XVII and XVIII show an application similar to
that described in the 8th Example with the difference that the three intermediary
pulleys 57, 58 and 59 replace the two 50 and 51 for transmitting motion to the
cylinder 47 or the cylinder 48 or both. The bearings of the concentric shafts 46
and 49 are dispensed with and the system rests upon the pedestals or bearings
of the pulleys 57 and 59. The pulley 58 alone is provided with a movable
bearing.
10th Example. It will be seen from Figure XIX that this construction is very
much like that described in the two previous examples. The shafts 60 and 61 are
separated and mounted in the prolongation the one of the other. All bearings are
movable with the exception of that of the shaft 61 which is the centre of the whole
construction. The bearing of the shaft 60 can be dispensed with.
11th Example. Like the three previous examples, this deserves to be mentioned
because of its application to differential machines working with a planetary
movement. Besides using the extensible cylinder, it comprises an application of
centrifugal power for the benefit of the flexible locking or frictional contact of the

page_text: contact pulleys. Figure XX shows a vertical section of this construction upon a
double differential system with a planetary motion which enables me to increase or
.reduce the speed of two shafts 62 and 63.
Let it be supposed that the motion is imparted by the shaft 62 to the shaft 63.
One of my extensible friction cylinders 64 is mounted upon the former and is in
contact with pulleys 66 and 67 and with a third pulley of the same size which
latter is not shewn in the drawing. All these three pulleys are mounted in movable
bearings 66. This example concerns three pulleys but the system can work any
other number of pulleys not less than three which is necessary in order to assure
the equilibrium of the pressures in the bearings.
These pulleys are in contact with the crown 68. A lantern wheel 69 concentric
to the shafts 62 and 63 extends over the parts 64 and the above mentioned three
pulleys. Upon the second shaft 63, a movable wheel 70 mounted which is in
contact with three other pulleys 72, 73 and a third one not shewn, all of which
are mounted in movable bearings 66* upon the same shaft as the preceding pulleys.
An extensible counter cylinder 74 mounted loose between the shafts 62 and 63,
assures the necessary frictional pressure between the latter pulleys and the wheel 70
for obtaining the adherence necessary for the transmission of the motion of the
cylinder 74 upon the pulleys. When the movement is given by the shaft 62 to the
upper three pulleys, the latter assume two motions one of rotation around their axle
the other of revolution around shafts 62 and 63.
The lantern wheel 69 thus receives a rotary motion, and the pulleys and the
shafts which it supports receive a planetary motion.
It will be readily seen that the motion cannot be imparted to the wheel 70 by
any other means than by the difference between the tangential velocities of the
corresponding upper and lower pulleys which are mounted firmly two by two, upon
the same shaft. Thus, if the radii of the upper pulleys are equal to the radii of
the lower pulleys, the wheel or cylinder 68 being fixed, the wheel 70 will remain
fixed upon its axle; the proportion between the velocities of the axles 62 and 63
V 62
will thus be infinite
V 63
88
If the radii of the two systems of pulleys are different (see the drawing), the
course gone over by one point of the circumference of the upper pulleys being
larger than that gone over by a corresponding point upon the circumference of the
lower pulleys, the wheel 70, which is continuously in contact without sliding with
the latter, must go over a course equal to the difference of the above courses.
The motion will thus be transmitted from 62 to 63 by the shafts and their
pulleys having a planetary motion; the circumferential speed of those pulleys
being very great in proportion to the differential speed generated upon the wheel 70,
the transmitted strain will be weak upon the pulleys and considerable upon the
wheel 70.
Under these circumstances, the elastic locking will have to be proportionate to
the strain and will comprise 2 phases:
1st-The elastic locking or contact obtained by means of the compressible
fittings projecting at the periphery of the cylinders 64 and 74 in order to obtain
the adherence required for the transmission of the action of the cylinder 64 to the
planetary pulleys, this frictional contact being balanced by the reaction of the
pulleys upon the cylinders 68 and 70.
2nd: An elastic locking or contact obtained by the action of the centrifugal
power of the planetary pulleys and of their shafts upon the cylinders 68 and 70
for assuring the complementary adherence required for the transmission of the
action of the cylinder 68 to the cylinder 70 through the intermediary of the
upper and lower planetary pulleys and of their shafts.
As has been said, the pulleys are mounted in bearings that are movable following
the direction of the radii of the wheels 69 that support the same.
All pressures obtained, as has been already mentioned, for assuring the adherence

page_text: of the contact wheels are balanced and do not lead to any loss of work, other than
that caused by the tangential strain transmitted, and by the resistance to the
revolving of the pulleys, in the interior wheels 68 and 70.
These losses are much smaller than the loss resulting from the friction of'
gearings.
In my system the action is thus transmitted economically without noise or
vibration and at the required speeds; the construction of the system is moreover
completed by making the shafts revolve in bearings provided with bushes or upon
collars of conical rollers in order to still further reduce the friction of the members
of the apparatus..
The speed of the rotation of the planetary system may be very great, as it
assures the elastic locking by the action of centrifugal energy and enables me
to reduce the dimensions of the parts.
The system that I have just described can be mounted upon a horizontal or
inclined shaft with a number of planetary pulleys, in order that the pressure may
be balanced, and this will be the case whether the shaft 62 or the shaft 63 be the
motive shaft so that the number of revolutions be reduced or increased.
In the eleven different examples set forth above, the working shafts are parallel,
concentric or coincident and the pulleys or rollers are cylindrical, the surfaces in
contact roll upon each other without either wedging or gripping and the elastic
locking permits of the momentary separation of the pulleys in contact, which might
be produced by dust or particles of foreign matter, without the risk of accident or
interruption of work.
In all the examples, where the pressures produced by the elastic locking are equili-
brated mathematically and completely and do not occasion any loss of work between
the shafts of the wheels and cylinders, it may be said that the elastic locking is
obtained by an internal energy in the material of either the strap or the elastic
cylinder provided to approximate the axles or to separate them, automatically in
order to produce the elastic locking of the pulleys in contact. This locking is
obtained by physical agencies:-magnetic attraction, centrifugal energy, etc.
In all the examples given, I have supposed a constant proportion for one and
the same case between the speed of the driver shafts and that of the driven shafts.
My invention can however be applied differently as follows:-
1st To parallel shafts the pulleys of which cannot come in contact at their
peripheries except by the interposition of the counter pulley:
2nd-To two parallel shafts upon which coues are mounted in inverted direction
the adjacent surfaces of which are in contact with the counter pulley. In the
latter case that counter pulley can be moved laterally along the cones in order to
vary the proportion of the velocity of the driver and driven pulleys.
12th Example. In the first case I use the system of elastic locking shewn by
Example 1 where the strap which produces the same has two functions: the first,
in transmitting directly half the action of the driving pulley to the driven pulley
by the difference in the tension, between the two staples T - t = y; the second, in
producing the necessary elastic locking required for the adherence of the driving
and driven pulleys with the counter pulley, in order to transmit by a balanced
friction the other half of the energy of the driving shaft to the driven shaft. That
adherence is the product of the sum of the tensions T + t of the two staples of the
Hexible strap.
The above mentioned second case is dealt with in Examples 13 and 14.
13th Example. In Figures XXI to XXIV the driving shaft 75 is mounted in
two fixed bearings and receives a cone 76 of an inclination . The receiving
shaft 77 is mounted in two movable bearings upon a parallel support 78. It
receives a cone 79 of an inclination b. The cylindrical pulley 80 is placed in a
support 81 articulated upon a screw 82 placed in two fixed supports. The axle of
the screw is parallel to the adjacent faces of the cones 76 and 79.
If there be imparted to the screw 82, a rotary motion by means of the handle 83,
the support 81 is moved. The latter carries along the counter pulley 80 and a

page_text: strap 84 of a flexible material, which surrounds the two cones by passing between
the branches of the support, which are provided with guide rollers.
The motion of the receiving shaft varies in speed according to the position of
contact of the counter pulley with the cones while that of the driving shaft remains
constant. The inclinations a and b of the two cones are calculated in such a way
that the elastic locking of the contact pulleys remains proportionate to the
transmitted strain; therefore, if motion has to be transmitted from the shaft 75 to
the shaft 77, the length of the arc covered by the flexible strap must increase
gradually with the diminution of the speed of the latter, whilst this must occur
under conditions in proportion with its elasticity.
The said elastic locking, proportionate to the transmitted strain is obtained
automatically by the displacement of the support 81, the counter pulley of which
forces the axle of the cone 79 to change places parallel with that of cone 76.
The functions of the elastic straps applied to cones remain the same as those
already described when applied to cylindrical pulleys.
I can also make the counter pulley 80 move along a fixed shaft and impart to
the latter a motion varying as far as either of the two cones is concerned whichever
may be the driver. In that case the shafts of the cone must be mounted in
oscillating supports; the shaft of the pulley 80 centres the entire system. To the
latter device I can also apply my engaging and disengaging system illustrated and
described in Example 7 hereabove.
14th Example. In this example the Figures XXV and XXVI show that it is
possible to insert between two transmission shafts 85 and 86 a device similar to the
preceding with the exception that the flexible locking is obtained by a crossing of
the straps of those shafts with that of the two cones 76 and 79. Two cones are
arranged symmetrically upon each of the shafts 75 and 77 in order to form a double
equilibrated system.
The shafts 75 and 77 as well as the counter pulleys are movable so that the
entire system is equilibrated by the straps.
The device inserted between two transmission shafts enables me to vary the
speed of either of them, during the motion, while the other keeps the same speed.
The transmission of the action of one cone upon the other occurs by the counter
pulley pressed energetically by the tension of the straps.
The inclinations a and 6 of the cones can automatically produce by the disengage-
ment of each other from the shaft 75 and 77, a locking proportionate to the strain
transmitted by the counter pulley; said strain varying inversely as the speed of
the rotation of the former.
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 :-
1. The transmission of motion by the elastic locking of contact pulleys by means
of one or more fixed or loose counter cylinders and of a mechanical or physical
device producing a flexible adherence between the driving pulley and that or those
which receive the motion from the same, with the object of abolishing the
injurious friction of two shafts in their bearings and equilibrating the pressure in
the bearings.
2. In combination, the two main pulleys one of which is journalled in moveable
bearings capable of motion towards and from each other, the counter pulley between
the said main pulleys, and the means for holding the pulleys in yielding contact,
substantially as described, whereby the shafts of the driven and driving pulleys
will be relieved from frictional strain.
3. In combination, the two main pulleys, the interposed counter pulley, one of
said main pulleys being in movable bearings, and the solenoids or pole pieces for
keeping the said pulleys in yielding frictional contact, substantially as described.
4. In combination, the two main pulleys, the interposed counter pulley, one of
said main pulleys being in movable bearings, the solenoids or pole pieces, and the

page_text: revolving armature for energizing the same, said armature acting as the driver for
the driving pulley, substantially as described.
5. In combination the two main pulleys, one of which is adapted to drive the
other, the interposed counter pulley, one of the said main pulleys being in movable
bearings, and the means encircling the pulleys to hold them in yielding contact,
substantially as described.
6. In combination, the inverted conical pulleys, the counter pulley between, the
strap passing about the same, and the means for adjusting the counter pulley
lengthwise of the conical pulleys, substantially as described.
7. In combination, the main pulleys in movable bearings, the interposed counter
pulley having a yielding surface and means for keeping said parts in contact,
substantially as described.
8. In combination, the shafts 62, 63, the interposed counter pulleys 64, 74, the
pulleys engaging therewith and movable in their bearings, the surrounding
discs 68, 70, and the wheels 69 carrying the movable bearings of the pulleys,
substantially as described.
Dated 18th day of June 1901
HENRY H. LEIGH, C.P.A.