New Two Speed Gearing for Bicycles, Tricycles, or any Vehicle Propelled by Power.
Year: 1896

page_text: Date of Application, 18th Apr., 1896
Complete Specification Left, 16th Jan.. 1897-4ccepted, 27th Mar., 1897
PROVISIONAL SPECIFICATION.
A New Two Speed Gearing for Bicycles, Tricycles, or any Vehicle
Propelled by Power.
ARTHUR DICKSEE 7 Ryder Street, St. James, S.W. Fine Art Agent, do hereby
declare the nature of this invention to be as follows:-
My invention can be best explained by referring to the drawing which is a vertical
section through the centre in the same plane as the.axis of the axle.
The teeth of the gears are not shown in the drawing nor are the means of adjusting
the bearings which had better be in all cases ball bearings.
A is the axle.
B is the chain wheel running loose on the axle A (bearings not shown) which
instead of having spokes or a disc in the centre thereof has the disc on one side
leaving the inner side of the rim clear; this inner side is toothed so as to form .an
annular wheel.
C is a spur wheel keyed or otherwise fixed to the axle. A and running in the same
plane as the chain wheel B.
D is another wheel similar to B except that it has teeth both inside and outside
of the rim (so that it is an annular and.spur wheel combined). It gears with the
spur wheel C at G by means of its inside teeth and it gears with the annular wheel B
at H by means of its outside teeth. It revolves in bearings (not shown) on E which is
sufficiently eccentric to make D gear as before described and E also runs in bearings
(not shown) on the axle A. This block E will be; kept as small as possible so as to
reduce the friction of D running on it. Fixed firmly to E is.a thin plate F which
fits into a groove in B to keep the dust out.
On the rim.I of the chain wheel B are cut.a number of slight recesses.and attached
to F is a bar (or two or three if necessary) which, is held down by springs, or may be
a strong spring, which bar fits into one of the recesses of 1. This catch is not.show.n
on the drawing. It. however binds the whole wheel firmly together and then the
wheel revolves as if it were solid; and the gear is not in action.
If however the gear is wanted, by means of a handle lever and connecting rod
(which will vary according to the shape of the machine and the position the handie
is wanted) an inclined plane, with a recess at the end the same shape as the recess.in I,
is pushed so as to come, in contact with the catch which holds the wheel together
without of course getting in the way of the chain wheel or chain. The catch slides
up this inclined plane thereby becoming released from the recess in I and then drops
into the recess at the end of the inclined plane which must be so arranged that the
catch is quite clear of 1. It therefore and consequently the plate F and the boss E
are now held rigid and the gear is in work, the axle A driving the spur wheel C
which is fixed to it; the wheel C gearing with the wheel D at. G and the. wheel D
gearing with the chain wheel B at H.
The amount of reduction in pace obtained by this gear will depend upon the
relative.diameters of B and C.
It will be noticed that all the parts are revolving in the same direction although at
slightly different paces, the friction therefore is very small.
Should it be necessary to have double bearings where B. and E. run on the axle A.
a boss can be cast on E similar to B and if necessary (to save space) the bearings
ليم

page_text: supporting the axle on the machine can be fitted outside these two bosses instead of
on the axle.
The above description applies to the application of my invention to a bicycle or
tricycle; of course B in other cases need not be a chain wheel; it may be a spur
wheel or a grooved wheel for cord or gut, or a flat wheel for band or any other form
for transmitting power.
101 1
A New Two Speed Gearing for Bicycles, Tricycles, or any Vehicle
Propelled by Power.
I, ARTHUR DICKSEE of 7 Ryder Street, St. James, S.W., Fine Art 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:-
My invention has for its object a more convenient two speed gearing for bicycles,
tricycles, or power propelled vehicles than any now in use. It consists of a pedal
axis or other driving shaft, a toothed wheel fast thereon, a ring with internal and
external teeth, an eccentric bearing carrying the toothed ring and itself free to turn
on the pedal or driving axis, and the chain wheel of the bicycle or other wheel to
which the gearing is applied. The tooth wheel on the pedal or driving axis
engages with the internal teeth of the ring whilst the external teeth of the ring gear
into internal teeth upon the chain wheel of the bicycle or other wheel which is to be
driven.
Thus in this gearing the chain or driven wheel is concentric with the pedal or
driving axis and is mounted upon it.
When it is required to reduce the speed from the pedal or driving axis to the chain
wheel or driven wheel the eccentric bearing is by any convenient locking mechanism,
locked fast to the frame of the vehicle.
When it is required to rotate the driven wheel at the same speed as the pedal axis
the eccentric bearing is locked fast to the chain wheel or driven wheel and all parts
of the gear then revolve at the same rate.
In order that my invention may be fully understood I will proceed to describe the
drawing annexed.
The drawing shows a section taken along the centre line of the pedal axis of a
bicycle or tricycle to which my gearing is applied. The drawing is made to about
. twice the actual size.
A is the pedal axis, it is mounted with ball bearings provided within a cylinder X
which forms part of the frame of the vehicle. B is the chain wheel, it turns loosely
with a ball bearing upon the pedal axis A. C is a spur wheel fast on the pedal axis A
and D is a ring with both internal and external teeth surrounding the wheel C and
gearing with it at G whilst it gears also with the chain wheel B at H, the chain wheel
also having a ring of teeth internally.
The drawing does not show the teeth of the gearing but the pitch lines of the gear
are intersected in each case by the plane of the section.
E is an eccentric bearing on which the ring D can turn and which itself is able to
turn on the pedal axis. By any convenient arrangement of locking mechanism the
eccentric bearing E can be locked fast either with the frame of the vehicle or with
the wheel B. F is a disc in one piece with the bearing E and serving to prevent the
entrance of dust to the gearing. When the gear is not required, that is to say,

page_text: when the chain wheel B is required to revolve at the same rate as the axis A then the
chain wheel is locked fast with the eccentric bearing E and the parts A, B, C, D,
and E then all turn at the same speed as if they were solid together. When on the
other hand the chain wheel is to revolve at a reduced speed, the part E is locked fast
with the frame.
Although throughout this specification I speak of the "driving axis" and the
"driven wheel" nevertheless in some cases it may be expedient that the wheel should
be the driver and the axis the driven part; hence it is my intention that the terms
"driving" and "driven" should be interchangeable.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
Two speed gearing consisting of a driving axis A, a driven wheel B mounted
loosely thereon, a toothed wheel C fast on the axis A, a toothed ring D engaging with
both B and C and capable of revolving on an eccentric bearing E which itself is
mounted so that it may turn freely upon the driving axis.
Dated this 2nd day of January 1897
ARTHUR DICKSEE.