Improvements in Friction Gearing.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Friction Gearing.
A communication by FRITZ DURR, of 97, Alt-Moabit, Berlin, in the Empire of
Germany, Civil Engineer...
I, WILLIAM PITILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, 118, New Street, Birmingham, in the County
of Warwick, and 322, High Holborn, in the County of Middlesex, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
The present gearing is characterised by one or more ratios of transfer being
capable of being attained by its means, and also by it being capable of being
operated with bevel gearing.
In the accompanying drawings,
Figure 1 shows in section a parallel driving gear with two proportions of
transfer, and
Figure 2 a sectional view of a simple bevel or angular driving gear.
In Figure 1 a friction wheel a is provided with three friction rings b and c,
of which the latter is of larger diameter and is arranged between the two former
so that the cross section of the wheel has a fork shape. The friction wheel
mounted on the shaft g consists of two halves d and e adjustable to or from one
another, the nave of the one part d being shaped like a bush on which the other
half e of the wheel can be adjusted or moved. The bush f of the wheel half d
carries a ring z, and this is provided with a guide ring has is also the
nave of the wheel half e. Both rings are connected with a setting or adjusting
mechanism i. The wheel halves d and e have on their inner surface each a friction
ring m, corresponding to the friction ring c of the other wheel. The outer sur-
faces of the wheel half have again each of them a friction ring n corresponding
with the friction ring of the other wheel. According as to whether the two
wheel halves d and e are pressed against one another or away from one another,
the friction rings m and corn and as the case may be come into engagement,
and thereby a greater or lesser ratio of transfer or transmission is obtained.
In the form of construction shown in Figure 2, a disc r is mounted on
shaft o, and is provided with a lateral friction ring s. On the shaft two wheel
halves d and e are adjustably arranged between fixed set rings 1. Between each
wheel half and a set ring there is mounted an elastic ring so that the two wheel
halves are pressed against the lateral friction ring s. In this manner a friction
angular driving is attained.
a
In order however to enable it to be arranged for multiple transfer it is only
necessary to provide a disc with friction rings s lying concentrically to one
another and to repeat on the shaft g the arrangement shown in Figure 2 of the
wheel halves d and e with an elastic ring and set rings 1 correspondingly.
In order in such case to throw into gear the one or the other ratio of transfer

page_text: the remaining halves and e of the wheel may be pressed apart by means of a
lever mechanism, or all the parts del may be mounted on a common bush or
socket which by means of a pin or the like is connected with the shaft g. Then
only such halves of the wheel remain in connection with the shaft as yield the
desired ratio of transfer, whilst all the remaining parts of the wheel rotate with
their bush or socket on the shaft. In both forms of construction either the
driven or the driving friction wheel may be divided.
Dated this 18th day of December 1897.
A communication by FRITZ DURR, of 97, Alt-Moabit, Berlin, in the Empire of
Germany, Civil Engineer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, 118, New Street, Birmingham, in the County
of Warwick, and 322, High Holborn, in the County of Middlesex, Civil 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:
The present gearing is characterised by one or more ratios of transfer being
capable of being attained by its means, and also by it being capable of being
operated with bevel gearing.
In the drawings accompanying the Provisional Specification:-
Figure 1 shows in section a parallel driving gear with two proportions of
transfer, and
Figure 2 a sectional view of a simple bevel or angular driving gear.
In Figure 1 a friction wheel a is provided with three friction rings b and c,
of which the latter is of larger diameter and is arranged between the two former
so that the cross section of the wheel has a fork shape. The friction wheel
mounted on the shaft g consists of two halves d and e adjustable to or from one
another, the nave of the one part d being shaped like a bush on which the other
half of the wheel can be adjusted or moved. The bush f of the wheel half d
carries a ring z, and this is provided with a guide ring has is also the
nave of the wheel half e. Both rings are connected with a setting or adjusting
mechanism. The wheel halves and e have on their inner surface each a friction
ring m, corresponding to the friction ring of the other wheel. The outer sur-
faces of the wheel halves have again each of them a friction ring corresponding
with the friction rings 6 of the other wheel. According as to whether the two
wheel halves d and e are pressed against one another or away from one another,
the friction rings m and corn and as the case may be come into engagement,
and thereby a greater or lesser ratio of transfer or transmission is obtained.
In the form of construction shown in Figure 2, a disc r is mounted on a
shaft o, and is provided with a lateral friction ring s. On the shaft g two wheel
halves and e are adjustably arranged between fixed set rings 1. Between each
wheel half and a set ring there is mounted an elastic ring
halves are pressed against the lateral friction ring 8.
angular driving is attained.
In
so that the two wheel
this manner a friction

page_text: In order however to enable it to be arranged for multiple transfer it is only
necessary to provide the disc r with friction rings s lying concentrically to one
another and to repeat on the shaft the arrangement shown in Figure 2 of the
wheel halves d and e with an elastic ringa and set rings correspondingly.
In order in such case to throw into gear the one or the other ratio of transfer
the remaining halves d and e of the wheel may be pressed apart by means of a
lever mechanism, or all the parts de al may be mounted on a common bush or
socket which by means of a pin or the like is connected with the shaft g. Then
only such halves of the wheel remain in connection with the shaft as yield the
desired ratio of transfer, whilst all the remaining parts of the wheel rotate with
their bush or socket on the shaft. In both forms of construction either the
driven or the driving friction wheel may be divided.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is :-
1. An improved friction gearing characterised by one friction wheel having
several friction rings of different diameters whilst the other friction wheel con-
sists of two half discs (and e) provided on their inner surfaces with friction
rings (m) and on their outer surfaces with friction rings (»), the said fric-
tion rings (m and n) being of such different diameters as to engage with the
friction rings of the other wheel and render possible a greater or lesser ratio
of transfer with the same gearing according as the inner or the outer friction
rings (m or n) of the one wheel are brought into engagement with the corre-
sponding rings (c or b) of the other wheel, substantially as hereinbefore
described.
2. A modification of the friction gearing hereinbefore described characterised
by one wheel being provided on its flat side with one or more lateral friction
rings (s) each adapted to engage between two wheel halves ( and e) adjustably
mounted on the other shaft (g) and pressed with a spring action one against the
other and capable of being thrown out of gear, so that shafts standing at a suit-
able angle may be thrown into gear at different ratios of transfer by the same
gearing by means of friction gearing, the adjustment taking place automatically
without displacing the shaft bearings substantially as hereinbefore described.
Dated this 31st day of August 1898.
WM. P. THOMPSON & Co.,
Agents.