Improvements in Frictional Gearing.
Year: 1889

page_text: Date of Application, 5th June, 1889
Complete Specification Left. 19th Aug. 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION.
Improvements in Frictional Gearing.
I, AUGUSTIN HENRY HAMON, of 15 Rue des Halles, Paris, France, Engineer, do
hereby declare the nature of this invention to be as follows:-
For the transmission of rotary motion from one shaft rotating at slow or moderate
velocity to another shaft or shafts which is or are to be driven at a greater speed
various arrangements have been hitherto adopted such for examples, as toothed wheels,
belts, and friction pulleys; but these arrangements have been either too complicated
or not reliable for conditions of exact transmission, or they are noisy and unsafe.
This invention is designed to obviate these disadvantages and one arrangement of
apparatus according thereto is shewn in the annexed drawings.
Fig. 1 being a horizontal section and
Fig. 2 a side elevation to a larger scale.
In this arrangement transmission is effected from the shaft A of a motor V
rotating at say, 100 revolutions per minute to two shafts B and C, inclined at a
certain angle to A, and which are to be rotated at say 10 times the speed of the
shaft A. This is effected by means of two conical co-axial discs D and E one (D)
running loose on the shaft A and the other (E) keyed to the shaft.. Between these
discs run two cones F, G of equal conicity. The discs D and E are provided
with grooved collars by which they can be brought close together or separated
through the action of a right and left-handed screw spindle J on levers L and K,
which levers are pivotted at O, O and engage with the grooved collars by pins M, M.
The discs or the conical rollers F G can be made of hard polished metal or can be
covered externally with some softer material, such as paper or copper, compressed,
hardened and turned up true. The shafts B, C can be rigidly attached to the
machines or apparatus to be driven, for example to dynamos N, N¹, by means of
conical clutches P, P¹, or by any other suitable means.
The shaft A, which may be the driving shaft of a steam engine V or other motor,
transmits motion to the disc E, whilst by means of the spindle J this disc is moved
towards the disc D, and into contact with the conical rollers which will be moved at
a great velocity by tangential friction, the amount of friction varying according to
the adjustment of the screw spindle J.
The arrangement for transmission and coupling just described is designed chiefly
for simplicity, the work being merely transmitted by the single inside disc E, the
disc D serving only as a counter or movable support. In order to convert the disc D
into a disc imparting motive force similar to E and thus make the apparatus doubly
effective, there may be employed a series of toothed wheels a, b, c, d, e, the former (a)
being fixed to the shaft A, the latter (e) fixed to the disc D, these toothed wheels
being so proportioned as to make the velocity of the external circumference of the
disc E equal to that of the internal circumference of the disc D. By this means the
rollers F G are actuated by equal and opposite tangential forces, forming a couple,
and the required high speed is thus obtained. The motion of the shaft A may be
transmitted to more than two other shafts provided that the conical surfaces of the
rollers are equi-distant along the surfaces of the discs. Or motion can be transmitted
to one shaft only the other or others being disengaged their rollers then serving
merely as intermediate stays for equalising the strains on the conical discs. It is
evident that the apparatus described. above may be applied inversely, and will admit
of a high speed of rotation being reduced to any desired low speed instead of being
increased.
Dated this 5th day of Inne 1880
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Frictional Gearing.
I, AUGUSTIN HEnry Hamon, of 15 Rue des Halles, Paris, 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:
For the transmission of rotary motion from one shaft rotating at slow or moderate
velocity to another shaft or shafts which is or are to be driven at a much greater
speed various arrangements have been hitherto adopted, such for example, as toothed
wheels, belts, and friction pulleys; but these arrangements have been either too
complicated or not reliable for conditions of exact transmission or they are noisy and
unsafe.
This invention is designed to obviate these disadvantages and an arrangement of
apparatus according thereto is shewn in the sheet of drawings filed with my
provisional specification.
Fig. 1 being a horizontal section and
Fig. 2 a side elevation to a larger scale.
In this arrangement transmission is effected from the shaft A of a motor V rotating
at say, 100 revolutions per minute to two shafts B and C, inclined at a certain angle
to A, and which are to be rotated at say 10 times the speed of the shaft A. This is
effected by means of two conical co-axial discs D and E, one (1) running loose on the
shaft A and the other (E) keyed on the shaft but also capable of end wise motion.
Between these discs run two cones F, G of equal conicity. The discs D and E are
provided with grooved collars by which they can be brought close together or
separated through the action of a right and left-handed screw spindle J on levers K
and L which levers are pivotted at O, O and engage with the grooved collars
provided with anti-frictional rollers M, M. The discs or the conical rollers F, G
can be made of hard polished metal or can be covered externally with some softer
material, such as paper or copper, compressed, hardened and turned up true. The
shafts B, C, may be connected to the machines or apparatus to be driven, for example
to dynamos N, N₁, by means of conical clutches P, P₁ or by any other suitable
means.
The shaft A, which may be the driving shaft of a steam engine V or other motor,
transmits motion to the disc. E. By means of the spindle J this disc can be moved
towards the disc D and into contact with the conical rollers which will be moved at
a great velocity by tangential friction, the amount of friction varying, according to
the adjustment of the screw spindle J.
The arrangement for transmission and coupling just described is direct and single
acting the work being merely transmitted by the single inside disc E, the disc D
serving only as an abutment or movable support. In order to convert the disc D into
a disc imparting motive force similar to E and thus make the apparatus double-
acting, there may be employed a series of toothed wheels a, b, c, d, e, the first (a)
being fixed to the shaft A, the last (e) fixed to the disc D, these toothed wheels being
so proportioned as to make the velocity of the external circumference of the disc E
equal to that of the internal circumference of the disc D. By this means the
rollers F, G are actuated by equal and opposite tangential forces, forming a couple,
and the required high speed is thus obtained. The motion of the shaft A may be
transmitted to more than two other shafts provided that the conical surfaces of the
rollers are equi-distant along the surfaces of the discs. Or motion can be transmitted
to one shaft only, the other or others being disengaged, their rollers then serving
merely as intermediate bearings or points of support for equalising the strains on
the conical discs. It is evident that the apparatus described above can be applied
inversely, so as to allow of a high speed of rotation being reduced to any desired low
speed instead of being increased.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what
I claim is :-
In apparatus for the transmission of rotary motion, the combination of a male and
a female conical disc such as D and E (with or without gearing such as a, b, c, d, e,)
with interposed conical rollers such as F, G, mounted on shafts B, C, connected to
the machines or apparatus to one or more of which it is required to transmit rotary
motion, the discs D, E, being capable of being pressed towards or of being separated
from each other by the action of a right and left hand screw spindle acting upon
levers such as K, L, substantially as described and illustrated.
Dated this 10th da
CAL 1000
A. H. HAMON,
Per L. W.