Improvements in Gear for Transmitting Motion.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Gear for Transmitting Motion.
I, PAUL MALLET, of 7, Rue Saint-Vincent-de-Paul, Paris, in the Republic of
France, Engineer, do hereby declare the nature of this invention to be as follows:-
My invention has for its object gear for transmitting motion from a driving shaft
to a driven shaft, the said gear regulating the work by automatically varying the
speed of the driving shaft in an inverse ratio to the resistance to which it is subjected.
In the said gear the combination of the parts permits of the progressive connection
to be obtained for the forward and backward movements, the regulation of the speed,
as desired, in both directions and the automatic regulation of the speed with respect
to the resistance offered to the forward movement.
In carrying out the invention I provide a driving shaft giving movement to two
dises and between which a roller is held. This roller is held upon a spindle movable
upon its axis and furnished with an endless screw gearing with a worn wheel fixed
upon the driven shaft.
The worn spindle also carries a clutch sleeve and a friction
cone; by displacing the said spindle to the right the sleeve comes into contact with
a corresponding clutch half rigidly secured to a toothed wheel loosely mounted upon
the driving shaft; the said toothed wheel gears with two wheels of an epicyclic
train combined with a brake and actuated by the driving shaft. By the same
movement of the said spindle the friction cone is brought into contact with a hollow
fixed cone thereby forming a brake a sleeve sliding upon the worm spindle opposite
the friction cone enables the latter to be adjusted for regulating, as desired, the
pressure upon the fixed cone.
A spring acts upon the worm spindle in the direction
of its axis so as to oppose a certain resistance to its displacement to the left.
The roller is combined with રા second roller loose upon the worm and
maintained at a constant distance from the first named roller, its boss being held
between the boss of the said first named roller and a pin; this arrangement has for
its object to maintain a constant degree of friction between the discs and the roller.
The sleeve upon the worin spindle can be moved upon the said spindle by means of a
lever adapted to be suitably actuated.
Upon the driving shaft of the motor there are keyed a fly wheel and a bevel
wheel; the epicyclic wheels are mounted loosely upon a spindle upon which is fixed
a brake pulley or wheel turning freely upon the driving shaft; the clutch bevel
wheel gearing with the said wheels and loose upon the driving shaft is retained in
position by a collar on the driving shaft.
The brake is arranged in such a manner as to exercise upon the driving shaft
an ordinary couple without giving rise to any tendency to bend. The upper
brake block is hinged to a lever movable in a vertical plane; the lower block is
carried upon a lower lever suspended by rods from a fixed point and from the
upper lever respectively. If the upper lever be forced downwards, the brake
block attached to it is applied against the brake pulley. The rod connecting
the upper and lower levers at the same time raises the lower lever and applies the
lower block to the brake pulley, the two brake blocks being applied to the
unlley with the same pressure.

page_text: To effect the movement of the dises the driving shaft carries a toothed wheel keyed
mpon it and gearing with two wheels of equal diameter. Each of the latter wheels is
keyed to a spindle having a friction roller and in alignment with the said spindles
there are arranged freely running spindles also provided with rollers of the same
diameter as the aforesaid friction rollers. The rollers of each pair are applied
against their disc at the same distance from its axis. A bearing disc is arranged
parallel to each disc upon a spindle arranged in alignment with the spindle or shaft
of the said disc; the said spindles of the bearing discs turn in adjustable bearings
and abut against a ball thrust bearing. The pressure between the friction rollers
and the disc is transmitted through the medium of a ring mounted with slight
friction in the disc; the operation is effected by means of rods which engage
partly in the disc and partly in the ring; the distance between the dise and ring
may be adjusted by means of studs screwed into the ring; the pressure of the
discs upon the rollers between them is adjusted by means of a screw-threaded
sleeve and two nuts.
To prevent the worm or endless screw from bending under the effect of the
obliquely directed action of the teeth of the worm wheel, two rollers are arranged ou
each side of the said screw and are mounted in adjustable bearings carried in the
frame.
The end of the said worm bears against a steel block forming part of a ball bearing
which can slide longitudinally and which bears against a rod transmitting the thrust
of the worn to a suitable spring.
The spring is provided with a toothed jacket and when it expands or is compressed
the teeth of the said jacket actuate a wheel keyed upon a shaft which, through the
medium of a second wheel, operates a rack carrying a rod the movement of which
oscillates a lever keyed upon a shaft and also a second lever having at its upper end
a fork which is moved towards the right or left according to whether the spring
expands or is compressed. A screw operated by a hand-wheel works in a nut upon
the end of the first named lever whereby, by fixing the position of the said nut, the
spring can be prevented from expanding so that the maximum speed transmitted can
be regulated as desired.
In the application of the gear to an automobile vehicle the driven shaft can
directly actuate the driving wheels of the vehicle; it is then made in two parts
connected together by differential gear. To this end two bevel wheels are mounted
upon the squared ends of the shaft parts and the axial thrust arising from the worm
is transmitted to the hevel wheels by a sleeve mounted loosely on the ends of the
two shaft parts. A ring fixed to each bevel wheel turns upon a fixed ring.
worm and its worm wheel are enclosed in a jacket containing oil as are also
the worm rollers and their various accessory parts. The cover of the jacket is fixed
to the common frame.
The
To start the transmitting gear in a forward direction the cone brake is released by
means of its sleeve and the other brake is also manipulated to liberate the epicyclic
train; the discs turn in opposite directions and rotate the intermediate roller in the
same direction as the driving shaft. The movement is transmitted to the driven
shaft by the worm and worm wheel. When the resistance to the movement of the
vehicle wheels increases the tangential force exerted at the contact between the worm
and worm wheel increases and the said worm noves to the left carrying with it the
roller which, on nearing the centre of the discs turns more slowly. When the
resistance to the movement of the vehicle wheels diminishes the worm moves to
the right and the speed increases.
If the resistance becomes very small the movement towards the right continues
until the cone brake automatically comes into operation and the clutch is 'put into
gear. By allowing the cone brake to come into full operation all movement is arrested
but, if desired, the speed may be merely reduced by adjusting the said brake by hand
through the medinm of the sleeve.
When the vehicle is stopped, backward movement can be effected by more or less
braking the epicyclic train in such a manner that the said train transmits to the roller

page_text: spindle through the medium of the clutch gear, a movement in a direction contrary
to that of the driving shaft and at a greater or less speed according to the manner in
which the brake is applied.
Dated this 8th day of March 1899.
G. F. REDFERN & Co.,
4. South Street, Finsbury, London, Agents for the Applicant,
Improvements in Gear for Transmitting Motion.
I, PAUL MALLET, of 7, Rue Saint-Vincent-de-Paul, 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 has for its object gear for transmitting motion from a driving shaft.
to a driven shaft, the said gear regulating the work by automatically varying the
speed of the driving shaft in an inverse ratio to the resistance to which it is subjected.
In the said gear the combination of the parts permits, on the one hand, when the
driven shaft rotates in a forward direction, of regulating the maximum speed which it
may attain and, on the other hand, of reversing the direction of rotation, in which
case the speed does not vary pro-rata of the resistance but can he regulated as
required by a braking arrangement.
The accompanying drawing represents as an example the application of my
invention to a motor car but I would remark that this gear can, with advantage, be
employed in tool-machines and in other apparatuses where it is required to drive a
rotary body subject to varying resistances.
In the said drawing-
Figure 1 is a sectional elevation of one form of construction of the gear:
Figure 2 is a plan of the same:
Figure 3 is an elevation of a more complete construction of the gear :
Figure 4 is a vertical section through-the axis:
Figure 5 is a view half in plan and half in horizontal section through the axis:
Figures 6 to 10 are sections taken respectively upon the lines 6-6 of Figure 3,
and 7-7, 8-8, 9-9 and 10-10 of Figure 4.
Figure 11 illustrates the mechanism for regulating by hand the speed of
transmission:
Figure 12 is a partial elevation of a modification of the gear with direct actuation
of the friction discs by the motor fly wheel:
Figure 13 is a view partly in plan and partly in horizontal section taken through
the axis of the worm :
Figure 14 is a detached view of a transmitting sleeve :
Figures 15 and 16 are a partial elevation and a partial plan respectively of a
modification of the gear with a friction or clutch plate between the motor fly wheel
and the friction discs:
Figure 17 is a transverse section on the line 16-16 of Figure 15, the friction or
clutch plate being removed.
The gear illustrated in Figures 1 and 2 chiefly comprises a driving shaft a giving
movement to two discs b and c between which is pressed a roller d. This roller d is
fixed upon a spindle e movable in the direction of its axis and furnished with a worin f
gearing with a worm wheel g fixed upon the driven shaft h. The spindle e also
carries a friction conej; by moving the spindle e towards the right hand, as indicated
in the drawing, the friction conej will come in contact with a fixed hollow cone ?

page_text: forming a brake; a sleeve » sliding upon the spindle e in front of the friction cone j
enables the latter to be adjusted for regulating, as desired, the friction upon the
cone 7.
Two springs 8 transmit to the spindle e, through the medium of suitable
gear, a force directed along its axis so as to offer resistance to its movement towards
the left hand. The discs b and c are mounted loose upon a transverse spindle 82
fixed to the frame; they are pressed towards one another by the springs s, the initial
tension of which can be regulated by means of the nuts 83. This tension afterwards
varies according to the position of the spindle e which carries along in its movement
the cross-piece 84 and the connecting rods 85 jointed to the bent levers 86. On the
spindle e is loosely mounted a second roller I held in a fixed position between the
dises bande by means of a fork 87 fixed to the frame; it serves solely to keep these
discs parallel. The said discs are actuated by means of a bevel pinion 88 mounted
upon the shaft aand gearing with two bevel wheels 89 carried by the discs b and c;
the pinion 88 is fixed to one half of a clutch 90 which can partake of the movement.
of the shaft a by engagement with the other half 91 of the said clutch. As soon as
the gear is in engagement, the discs b and c turn loose and in opposite direction on
their common shaft; they rotate the roller d which is at this moment near their
peripheries. The rotation of the spindle e and worm is communicated to the
wheel y and, consequently, to the wheels of the vehicle.
If the resistance to the rolling of the vehicle wheels increases the tangential force
at the contact of the worm and wheel g increases; this worm moves towards the
left hand, and carries along the roller d which thus approaches the centre of the
discs b and c. The roller moving over a smaller circumference the speed of
rotation of the spindle and, consequently, of the vehicle wheels decreases. The
cross-piece 84 follows the movement of the worm and the connecting rods 85 cause
the levers 86 to rock, so that the springs s are further compressed and the discs b and c
pressed with greater force against the roller d. This arrangement allows of actuating
the roller in all cases, and of increasing the adherence of the dises upon the said
roller when the resistance to the motion increases.
On the other hand, when the resistance to the rolling decreases the worm moves
towards the right hand, the roller d approaches the periphery of the discs b and e
and the speed of rotation of the spindle e increases, as well as that of the wheels of
the vehicle.
When
When requiring to stop upon level ground, the gear is first disengaged, the wheels
of the vehicle and the wheel y continue to turn by reason of the inertia and the
worm is forced towards the right hand; in this movement the cone ; becomes
engaged in the hollow cone q, causes friction, and soon stops the vehicle.
commencing to travel down an incline and the gear is disengaged, the same movement
towards the right hand takes place but, according to the angle that has been given to
the friction cone, either a stoppage may result therefrom or a braking the power of
which can be regulated as required by means of a mechanism operated by hand
allowing of moving the sleeve 1. This arrangement thus forms an automatic brake
and as a result allows of stopping upon a level after disengagement and of retaining a
constant speed when descending an incline. The system of gear which has just been
described can be easily arranged to allow the conductor, at will, to vary the speed
while travelling. It is only necessary to apply the brake to the driven shaft / until
the required speed is obtained; suitable mechanism can be provided to lock the
levers 86 in position at this moment and afterwards allow of discontinuing the action
of the brake upon the shaft h.
The gear illustrated in Figures 3 to 11 chiefly comprises a driving shaft a actuating
two dises bande between which is pressed a roller d. This roller is fixed on a
spindle e movable in the direction of its axis and provided with a worm gearing with
a worm wheel g upon the driven shaft h. The spindle also carries one half i of
a clutch and a friction conej. When the spindle e moves towards the right hand the
part of the clutch comes in contact with the corresponding half fixed to a toothed
wheel mounted loose upon the shaft a The wheel gears with the pinions m and n
of an epicycloidal train of gearing m, n, o combined with a brake p and actuated by

page_text: the shaft ; similarly the friction cone 3 comes in contact with a fixed hollow cone
forming a brake; a sleeve sliding upon the shaft e in front of the conej allows of
loosening the latter when required in order to regulate the friction upon the cone q.
A spring & acts upon the spindle e in the direction of its axis so as to offer a certain
resistance to its movement towards the left hand.
The roller d is combined with a second roller 1 loose upon the spindle e and held at
a constant distance from the roller d, its boss being held between the boss of the
roller d and the pin 2; this arrangement has for object to maintain a constant
friction between the discs b and c and the roller d.
The sleever can be moved upon the spindle e by means of a lever 3 turning upon a
pin 4 and actuated at 5.
Upon the driving shaft are keyed the fly wheel 6 of the motor and a bevel wheel o;
the wheels m and are mounted loose upon a shaft 8 fixed to a wheel 7 turning freely
upon the shaft "; the bevel wheel gearing with m and and loose upon the shaft a
is held thereon by the head 9 upon the shaft a. The combination of wheels m, n, o
acting upon the wheel 7 form an epicycloidal or differential gear.
The brake p, p acting upon the wheel 7 is arranged in such a manner as to exert
upon the shaft two opposing forces without causing any divergent pressure; in
Figure 7, 12 indicates a lever, operated at 13 in a downward direction, upon which
the upper brake shoe pivots at 14; the lower brake shoe is carried by the lever 15
suspended by rods 16 and 17 from a fixed point 18 and from the lever 12 at 19. If
the lever 12 be pressed downwards at 13 the spring 20 is deflected, the lever 12 turns
upon the point 21 until the upper brake shoe is applied to the wheel 7; then the
rod 17 secured at 19 lifts the lower lever 15 which is jointed at 22 until the lower
brake shoe comes in contact with the wheel 7; at this moment the brakes act in
opposite directions upon the wheel 7 with equal force.
In order to impart motion to the discs 6 and the shaft a has keyed thereon a
toothed wheel 25 gearing with two symmetrically arranged and similar wheels 26.
(Only one of these wheels 26 is seen on the lower half in section in Figure 5, the
other is symmetrical to it with relation to the shaft.) Each wheel 26 gives motion
to a shaft 27 carrying a roller 28; in a line with the shaft 27 a shaft 30 freely turns
and carries a roller 29 of the same diameter as the roller 28; these two rollers press
against the disc c at an equal distance from its axis. A disc 31 is arranged parallel
with the disc c upon a shaft 32 arranged in a line with the shaft 33 of the disc e; the
shaft 32 turns in vertically adjustable bearings and abuts against a ball bearing 37
adapted to slide in the direction of the axis of the shaft 32 and to receive a varying
pressure through the medium of an arrangement of suitable levers operated by hand
and acting upon a sliding block 38. The pressure between the rollers 28 and 29 and
the disc c is produced by means of a disc 40 turning freely within the dise c; the
movement is effected by means of studs 42 engaged half in the disc c and half in the
disc 40; the space between these discs can be altered by means of screws 41 screwed
into the disc 40; the pressure of the disc e on the rollers & and 1 is regulated by
means of a screw-threaded sleeve 43 and two nuts 44, 45.
g
To prevent the worm f from bending through the action of the teeth of the wheel
two rollers 51 are arranged on either side of the said worm and mounted in adjustable
bearings in a bracket 56 fixed to the sides 57 of the frame.
The end of the worm bears against a plummer block 58 provided with a ball
bearing 61 which can slide in a longitudinal direction and itself bears against a rod 63
transmitting the pressure of the worin f on to the flat springs 8 which can, if required,
be replaced by a spiral spring. When the spring s is deflected the strap 64 by means
of its toothed part rotates the wheel 65 keyed on the shaft 60; the latter through
the medium of a second wheel 67 operates a rack 68 carrying a rod 69 which,
consequently, causes a lever 70 keyed on the shaft 71 to oscillate as well as a lever 72,
the upper forked end 73 of which moves towards the right hand or towards the left
and according to whether the spring s is deflected or not. A screw 74 turned by
neaus of a handwheel 75 causes the nut. 76 to move longitudinally so that by fixing

page_text: the position of the nut 76 the springs is prevented from slackening and the maximum
speed can consequently be regulated at will.
In the application of the gear to a motor car the shaft can directly actuate the
driving wheels of the car; it is in that case made in two parts united by a differential
train of gear.
To this end two bevel wheels 77 operate the two parts of the shaft h
by means of a square portion 126, the push in the direction of the axis of the shaft /
arising from the worm is transmitted by the boss 78 of the wheel g to the wheels 77;
a ring 79 fixed to each wheel 77 turns against a fixed ring 80; the boss 78 turning
loosely on the adjacent ends of the two parts of the shaft carries the pivots of two
bevel pinions 127 which gear with the wheels 77.
The worm fand the wheel g are enclosed in a casing containing oil, as well as the
rollers 51 and their various accessories. The sides 81 forming the cover of this
casing are fixed on the general framing t.
To place the gear in operation in a forward direction the brake j, q is released by
means of the sleeve 7 and the brake p in order to liberate the epicycloidal gear t, m,
n, o; the discs b and c turn in opposite directions and cause the roller d to turn in the
same direction as the shaft a. The rotation is transmitted to the shaft h by
the worm f and the wheel g. When the resistance to the rolling of the wheels of the
vehicle increases the tangential force at the point of contact of the worm fand
wheel increases and the said worm is moved towards the left hand thereby moving
the roller d, which being located nearer the centre of the discs b and c, turns more
slowly. When the resistance to the rolling decreases the worm moves towards the
right hand and the speed increases.
If the resistance becomes weaker, the backward movement towards the right hand
continuing, the brake j, q is automatically applied and the two parts of the clutch, i,
are coupled up. By allowing the brake , q to completely act the movement is
stopped, but it may be sufficient to reduce the speed releasing the brake by means of
the sleeve operated by hand. When the vehicle is stopped the backward movement
is effected by applying the brake p so as to render the epicycloidal gear m, n, o more or
less completely immovable so that the latter will transmit to the spindle e through
the medium of the clutch i, ka speed in a contrary direction to that of the shaft a
smaller or greater according as the brake p is more or less strongly applied. The
dises b, c continue to rotate each in the same direction and consequently tend to move
in contrary direction the rollers d, 1 the speed of which they simply decrease, which
is no objection when travelling backwards.
In Figures 12 to 17 the parts similar to those of the driving gear herein before
described are indicated by the same letters, the discs b and c (Figures 12 and 13) are
ench fixed to a cylinder 92 provided with a Hange 93 with friction packing 94. The
fly wheel 6 bears with one of the lateral faces of its rim against the packings 94 and
directly rotates the discs b and c. The latter turn in opposite directions but each always
turns in one direction. The change of direction of rotation of the spindle e which
carries the worm is effected by means of the roller 1. To this end the rollers d and I are
mounted loose upon the two cylindrical parts 95 and 90 of a sleeve shewn in detail,
Figure 14. The middle portion of this sleeve is made of hexagonal shape as shewn
at 97 and on this hexagonal part slides one portion 98 of a clutch which, however,
cannot rotate so that the latter can enter into engagement with the corresponding
teeth of the other part of the clutch with which the bosses of the rollers d and 1 are
provided. A part of the interior space of the sleeve 95, 96 is bored out conically and
is adapted to take on to a corresponding part of the spindle e; the nut 99 allows of
firinly fixing these two parts. It will be understood that the spindle e will turn in
one direction or the other according as the part 98 of the clutch is in engagement
with the roller d or with the roller 1; during the forward movement the rotation
takes place through the roller d, the part 98 of the clutch being pressed towards it by
the spring 100 which surrounds the sleeve 95, 96; to reverse the direction of travel
a flange 102 on a sleeve 103 fixed to the part 98 of the clutch is acted upon by means
of a forked lever 101 so as to bring the said portion of the clutch into engagement
with the other portion on the roller 1. The sleeve at the same time forms a stuffing

page_text: box and prevents dust from getting to the friction surfaces, access to which is still
further protected by means of a tube 104 fixed by a fastening 105 to the roller 1 and
which surrounds the spindle e; this tube is extended until it comes in contact with
the friction cone and thereby prevents the roller 1 from moving away from the
roller d.
The shafts 106 on which the discs b and c are fixed turn in bearings 107 supported
by a case 108 fixed to the sides of the frame; each of these shafts comprises two
conical portions 109 and 110, one of which is fixed and the other movable; the
bearings 107 are also provided with a fixed part and a movable conical part 111, the
locking of which upon the shaft. 106 can be regulated by means of screws 112; these
bearings 107 can slide easily in the fixed case 108. The end of the shaft 106 carries
a piece of steel 36 which is supported upon a ball bearing 38 in the interior of a
ring 39 against a second piece of steel 37 fixed to the end of a cylindrical casing 113
bored out so as to slide easily on the cylindrical part of the fixed case 108; the play
between these two pieces is sufficiently slight to prevent the introduction of the dust
into the ball pivot.
The rod 114 transmits the axial pressure of the worm ƒ through the medium of a
cross-piece S4 and two rods 85 sliding in guides 115 fixed to the frame, to two spiral
springs 8 (or to Belleville rings or washers) arranged at the side of the frame; these
springs bear against rings 116 fixed to the rods 85 and against the fixed guides 115.
When the worin f moves the roller 1 moving away from the centre of the discs b and c
for example, the springs & are bent thereby diminishing in length that is to say, the
springs are compressed. The maximum speed of transmission can be easily regulated
at will by fixing the limit of the backward movement of the rods 85 and, consequently,
of the rollers and 1 towards the right hand by means of hollowed bars 117 jointed
to the rods 85 and of levers 70, the extent of oscillation of which is regulated by a
hand-operated stop.
As a means of producing the engagement of the gear I have shewn the pressure
arrangement of the discs 6 and e against the rollers d and 1 variable at will; it may,
however, he preferable to maintain a constant pressure between the discs and the
rollers and to effect the engagement upon the cylinders of the discs b and c.
To this end arrange on the driving shaft a (Figures 15 and 16) a plate or disc 118
adapted to slide thereon but to partake of its rotation by means of a spline or key;
this disc is pressed by the spring 119 against the friction surfaces of the cylinders 92.
A lever 120, the forked end of which engages in the groove of a sleeve 121 fixed to the
plate or disc 118 allows of bringing the latter towards or away from the cylinders 92
according as it is required to disengage or engage.
The constant pressure of the discs b and c against the rollers & and 1 can be
effected by means of flat springs 122 (Figures 12, and 17) bearing against the ends of
the stop cases 113 and pressed one towards the other by means of rods 123; these
rods are divided into two parts connected by a nut 124 having left and right hand
threads which allows of altering their length and, consequently, of regulating the
tension of the springs. The rods 123, one of which rests through the guides 125
upon the frame are free to move in the direction of their length; the result is that
the pressures transmitted by the springs 122 to the discs b and c at the point of
contact with the rollers d and I are always equal to one another.
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. A gear for transmitting motion for motor carriages and the like comprising two
rotary discs act nating by friction a roller fixed on a shaft, which is movable in the
direction of its axis, a spring arrangement for pushing back the said shaft, a worm
carried by the said shaft and a worn wheel fixed on the driven shaft, the above
mentioned parts being arranged so that the speed of rotation of the roller varies with
the longitudinal displacement of the worm and consequently varies according to

page_text: the force of the spring and of the variable re-action of the worm wheel, substantially
as set forth.
2. A gear for transmitting motion comprising two rotary discs, a friction roller
fixed on a shaft movable in the direction of its axis between the two dises, a spring
arrangement for pushing back the said shaft, a worm carried by the said shaft, a worm
wheel fixed on the driven shaft in combination with a friction cone fixed on the
spindle of the worm, a hollow cone fixed to the frame of the apparatus and a movable
sleeve operated by hand allowing of decreasing the pressure of the friction cones
forming a brake, substantially as hereinbefore described.
3. A gear for transmitting motion comprising two rotary dises, a friction roller
fixed on a shaft movable in the direction of its axis between the two dises, a worm
carried by the said shaft, a worm wheel fixed on the driven shaft, and springs acting
on the one hand on the worm spindle for pushing it back by means of an arrange-
ment of rods and levers, and on the other hand on the two rotary dises in such a
manner that the adherence of the friction roller increases when the resistance of the
driven shaft increases, substantially as herein before described.
4. A gear for transmitting motion comprising two rotary discs, a friction roller
fixed on a shaft movable in the direction of its axis between the two discs, a second
roller mounted loose upon the said shaft and kept at a constant distance from the
former, a spring arrangement for pushing back the said shaft, a worm carried by the
said shaft and a worm wheel fixed upon the driven shaft, substantially as hereinbefore
described.
5. A gear for transmitting motion comprising two discs actuating by friction a
roller fixed on a shaft movable in the direction of its axis, a spring arrangement for
pushing back the said shaft, a worm carried by the said shaft and a worm wheel fixed
on the driven shaft, in combination with an arrangement allowing a backward
movement and comprising an epicycloidal gear and a brake acting on a disc which
carries the movable wheels of the said gear, the first central wheel of the said
gear being driven by the motor, whilst the last wheel is placed in engagement
with the worm shaft by a clutch, substantially as hereinbefore described.
gear
6. A gear for transmitting motion comprising two discs actuating by friction a
roller fixed on a shaft movable in the direction of its axis, a spring arrangement for
pushing back the said shaft, a worn carried by the said shaft, and a worm wheel fixed
on the driven shaft, in combination with an arrangement allowing of engaging the
with the motor and comprising friction rollers which act upon the outer face of the
two dises and which receive through gearing the motion of the notor, inovable dises
in contact with the said rollers and ineans for pressing the said discs with more or
less force against the rollers, substantially as herein before described.
7. A gear for transmitting motion comprising two rotary discs actuating by friction
a roller fixed on a shaft movable in the direction of its axis, a spring arrangement for
pushing back the said shaft, a worm carried by the said shaft and a worm wheel fixed
on the driven shaft in combination with an arrangement allowing of regulating the
maximum speed of the driven shaft by hand and comprising a lever for limiting the
play of the spring arrangement and a nut operated by means of a handwheel for
limiting the movement of the said lever, substantially as herein before described.
8. A gear for transmitting motion comprising two rotary discs a shaft movable in
the direction of its axis and placed between the discs, a spring arrangement for
forcing back the said shaft, a worm carried by the said shaft, a worm wheel fixed to the
driven shaft, and two friction rollers mounted loose upon the worm shaft, in combina-
tion with a clutch sliding on the said shaft but compelled to rotate with one or the other
of the said rollers according to the desired direction of rotation, substantially as
herein before described and illustrated in Figures 12 and 13 of the accompanying
drawing.
9. A gear for transmitting motion comprising two rotary discs actuating by friction
a roller fixed on a shaft movable in the direction of its axis, a spring arrangement for
forcing back the said shaft a worm carried by the said shaft and a worm wheel fixed
to the driven shaft and two friction rollers mounted loose upon the worm shaft in

page_text: combination with a clutch sliding on the said shaft but compelled to rotate with one
or the other of the said rollers according to the desired direction of rotation, sub-
stantially as herein before described.
10. A gear for transmitting motion comprising two rotary dises actuating by
friction two rollers either of which can be engaged with a shaft movable in the
direction of its axis, a spring arrangement for pushing back the said shaft, a worm
carried by the said shaft and a worm wheel fixed to the driven shaft in combination
with a driving arrangement having means for effecting engagement consisting of a
plate or disc mounted so as to slide on the motor shaft but compelled to turn with it,
a spring pressing the said plate against the periphery of the two hereinbefore
described discs and a disengaging lever allowing of moving the plate farther away
from the discs substantially as herein before described.
11. A gear for transmitting motion comprising two rotary discs actuating by
friction a roller fixed on a shaft movable in the direction of its axis, a spring arrange-.
ment for forcing back the said shaft and a worm wheel fixed on the driven shaft in
combination with an arrangement for producing a constant pressure on the discs
towards one another and consisting of two flat springs bearing against the abutment
cases of the said disc shafts and connected together by means of rods, the length of
which is adjustable and which are free to be moved in the direction of their axis,
substantially as herein before described.
OLL
1000
G. F. REDFERN & Co., .
4, South Street, Finsbury, London, Agents for the Applicant.