Improvements in Friction Gearing.
Year: 1899

page_text: Date of Application, 6th Nov., 1899-Accepted, 27th Jan., 1900
Improvements in Friction Gearing.
We, CARL ALRIK HULT, of 48, Flemminggatan, and OSCAR WALFRID HULT,
of 30, Handtverkaregatan, both in Stockholm, in the Kingdom of Sweden,
Engineers, 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:-
This invention relates to friction gearing and is characterized by the combina-
tion of a 11ng-shaped track or guide, of adjustable length, with elastic fiction
ngs 1olling on the said track, which 1ings bearing on the central roller or shaft
to be driven can be set up against the latter as required by suitably tightening
up the ring-shaped track around them. Furthermore, the friction gearing in
question (which as before known, is for driving the aforesaid rings provided
with olleis mounted on pivots on one common diving-disc) is fitted, firstly,
with a lubricating device by means of which the said pivots while running, and
at no other time, are continually supplied with oil, and secondly, with an ariange-
ment ensuring that the aforesaid track and the ings and the cential roller o
shaft will always be kept clear of any matter, such for instance as thick drip-oil
and the like, which would offer resistance
In the accompanying drawing:
Figure 1 is a longitudinal section of friction gearing constructed according to
our invention, and
Figure 2 is an end view of the same:
Figure 3 is a section; and
Figure 4 an elevation partly in section of the ing-shaped track detached
1 indicates the ring-shaped track, 2 the elastic friction rings, 3 the diving
rollers, 4 then pivots mounted on the disc 5 the shaft 6 of which is jou nalled in
the bearing 7. In the rotation of the disc 5 the 1olleis 3 will cause the rings 2 to
1oll over the track 1 between which and the roller or shaft 8 they are fitted so
as to bear in a yielding manner on both simultaneously, the shaft 8 being by this
means caused to revolve swiftly In order that this gearing may run in a
satisfactory manner it is evidently of great importance that the tension of the
imgs 2 should be accurately gauged so that the rings will not slip on the track
o alle no on the other hand exert too great a pressure on either
In order
to provide a means of adjusting this tension, the track 1 is cut or split the
ariangement being so contrived that the ends of the track engage with each
other and can be adjusted by means of a screw so that the track will be expanded
o contracted to a slight extent The closing up of the track ends at the joint,
for making the track perfectly even at the joint, can be effected in various
manners, for instance as shewn in Figure 3. we can secure to the outside of one
of the track ends an extension piece 9 extending over the other track end and
engaging with the adjusting sciew 10 passing through a lug 11 on the latter
track end. By tuining the screw the track 1 can evidently be expanded or
contracted, as required, so as to give the proper tension to the rings
The part 9
fitting accurately on the circular outside surface of the track-ng preventa
deformation at the joint One or more adjusting screws may be used. Or the

page_text: adjusting sciew can be inserted through a lug on the part 9 and screwed into a
coresponding lug on the opposite track end. The track 1 is located between
the flange 25, which is made in one piece with, or is suitably secured to, the
tramework or bearing 7, and the flange or cover 26 and it is held in place partly
by the bolts 27 uniting the parts 25 and 26 and partly by the small flanges 28.
Between the bolts and the flanges 28 there is ample space for the adjustment of
the track 1.
The lubricating arrangement is as follows -The bearing 7, provided with the
oil cup 12, has a longitudinal lubricating groove 13 terminating at that end
of the bearing which fits against the hub 14 of the disc and which end 18 covered
or embraced by a 11m projecting from the hub, the said im being turned inside
so as to form a groove 15 into which oil from the bearing 7 drips. Axially
through the hub 14 are made one or more holes 16 through which the oil can
pass on to the front side of the disc 5 which at this side is likewise provided with
a groove 17 whence the oil, forced outward owing, to the rotation of the disc, can
pass through apertures provided at the pivots 4 into the oil-groove 18 of the
latter, which groove is located on the side of the pivot facing the centre of the
friction gear. Oil 18 thus constantly supplied during the running of the gearing
to the pivots 4 and being diffused along the lafter serves to lubricate them
Most of the oil consumed is ejected in to the casing 19 whence it can How out
through the aperture 20
The device for keeping the track on guide 1, 1ngs 2, and shaft 8, clean
consists of nanow grooves 21 aanged on the said parts, into which grooves any
oil and impurities which there may be on the surfaces in contact is iolled down
by the pait rotating on the surface thus grooved. The said grooves may be
many or few in number and they may run either at right angles or obliquely to
the shait, preferably, however, so that those on one part intersect those on the
pait in contact with it, or they may foin a helix ete the main requiement
being that 100m to accumulate and a discharge outlet are provided for oil and
other matters which would otherwise remain for some length of time on the
surfaces of the rotating parts which come in contact and form a resistance to
then running. The said matter is, consequently, directly forced down into the
grooves which, to make the action more sure, are suitably given an oblique
dnection with respect to the running paths of the respective parts as shown
in the drawing Such grooves may be provided either on all the parts or on
one or more of them, and they may extend over a greater or less portion of their
surface. At the bottom of the track 1 apertures 22 are made for the discharge
ut oil or the like.
Another constructive feature of the gearing in question is that the flanges or
shoulders 23 of the 1olle 01 shaft 8, for guiding the rings 2, ale bevelled or
turned off obliquely so that then sides facing the ungs form obtuse angles to
the sides of the roller Each 11ng 15, moreover, made of such length that it
extends over the said flanges or shoulders and it is bevelled off at the edge
80 that it will roll on the flange or shoulder as well By this arrangement the
mjuious sliding friction is avoided which occurs between the ring and the
flange when the latter is of the usual square shape
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim 18:-
1 Friction gearing characterized by the combination of a ring-shaped track
or guide (1) which is split and has its ends united by one or more adjusting
screws so that it can be expanded or contracted, and elastic rings running on
the sand track on guide and bearing on the central roller pulley or shaft with
which the ings are to co-operate, and which rings can have the proper tension
given to them by diawing the track or guide together around them, substantially
ahown and described.

page_text: 2 In the friction gearing characterized in Claim 1: the arrangement of the
ring shaped track inserted as a separate ring between and held in place by two
Alanges united by bolts and supported by the frame-work or shaft bearing of
the gearing, 'substantially as shown and described.
3. Fuction gearing provided with an adjustable endless track or guide, as
characterized in Claim I, to one end of the split endless track of which is secured
an extension piece (9) covering and steadying the other track end along a circle,
and to one of the track ends of which there is fixed an adjusting screw engaging
with the other track end, substantially as shown and described.
4 Friction gearing in which the disc or centre (5), on which are mounted the
rollers actuating the elastic rings (2) mentioned in Claim 1, is provided with a
groove (15) covering one end of the journal-bearing of the disc, for catching
dip-oil from the bearing, and further provided with passages (18) through it
for conducting the oil to the front side of the disc, and with an oil collecting
groove (17) on the said front side, concentric to the centre of the disc and
communicating with the pivots of the rollers so as to admit the oil to the pivots
for their lubrication, substantially as shown and described
5 Friction gearing in which the 11ng shaped track or guide (1), between which
and the central roller or shaft (8) the elastic fiction rings (2) are located, is
provided with grooves (21) running at right angles or obliquely to the shaft,
for collecting drip-oil and the like, or in which either of the other rolling
surfaces, for instance that on the ing (2) or that on the roller or shaft (8) is
provided with such grooves, substantially as shown and described.
6 Friction gearing in which the central roller or shaft (8), between which and
a ring-shaped track or guide (1) the elastic friction rings (2) are located, is
provided th bevelled flanges or shoulders (23) on which the bevelled edges
of the rings roll for the purpose of avoiding any injurious sliding friction at
the said guide-flanges, substantially as shown and described
G. F. REDFERN & Co.,
4, South Street, Finsbury, London. Agents for the Applicants.