Improvements in and relating to Cycle Gearing.
Year: 1894

page_text: Date of Application, 28th May, 1894
'Complete Specification Left, 21st Feb., 1895-Accepted, 23rd Mar., 1895
WILLIAM BOSTOCK, Mechanic, 35 Humber Road, Beeston, Notts ABRAHAM
NICHOLSON, Mechanic, 40 Mona Street Beeston, Notts do hereby declare the
nature of this invention to be as follows:-
This invention relates to an improved arrangement of chain and toothed gearing
applicable to rear driven cycles, its object being an arrangement by which an
increased speed may be obtained without a corresponding increase of resistance.
A cycle constructed according to our invention has a toothed wheel rigidly
attached to the back leg, which wheel is geared to a similar sized wheel on the
hub by means of one or more pinions carried on axles inside the driven chain
wheel, the arrangement acting on the well known sun and planet principle.
Dated this 23rd day of June 1894.
W. H. POTTER, Wh. Sc.,
Newcastle Chambers, Nottingham, Agent for the Applicants.
Improvements in and relating to Cycle Gearing.
WILLIAM BOSTOCK 35 Humber Road Beeston Nottinghamshire, Mechanic
and ABRAHAM NICHOLSON 40 Mona Street Beeston Nottinghamshire Mechanic
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 an improved arrangement of gearing applicable to
rear driven cycles, the object of the invention being the production of a
" drive
by which a cycle may be propelled at a quicker speed than is usual with the
ordinary chain gear, and which is at the same time without a corresponding increase
in the weight of the machine or in the resistance of the machine to the speed
obtained.
According to this invention a bevil toothed wheel is firmly attached to the back
leg of the machine, and is geared to a similar toothed wheel on the hub of the
back wheel by one or more pinions which are carried by the driven chain wheel.
This latter is arranged to revolve on the wheel axle, and by means of the gear
wheels causes the back wheel to revolve at a greater speed than its own, the whole
arrangement acting on the principle of the sun and planet wheel arrangement.
The various revolving parts are by preference fitted with ball bearings.
This invention is illustrated by the accompanying sheet of drawings which are
referred to in the following detailed description.
Fig. 1 is a sectional elevation of a back wheel hub fitted with the improved
arrangement of gearing and
Fig. 2 is a front elevation of the driven chain wheel as arranged for two pinions,
one of which is shown in position.
The wheel hub a is provided with flanges a' for receiving the spokes which may
be "direct" or "laced," and at one end of the hub there is a ball bearing a² of

page_text: the ordinary kind and means for attaching the spindle b to one of the back legs.
The other end of the hub is enlarged at a³ to form a cover for the gear wheels,
and is recessed at a' for the reception of a boss on the toothed wheel c which is
itself recessed to form, in conjunction with a collar on the spindle b, a ball
bearing d. Beyond the collar b¹ the spindle is screw threaded, and has mounted
thereon a toothed wheel e which has the same number of teeth as the wheel c, and
On the outside of the
is, when in position, fastened to the back leg by the nut b³
wheel e is a plate e' which forms a cover in the same way as the flange a³. The
inside of the wheel e forms part of a ball bearing f, this bearing and the ball
bearing y being the bearings for the chain wheel h in which is formed the other
part of the bearings f and g. The chain wheel h has teeth ¹ for the chain on its
outer periphery for the chain, and in the arrangement shown carries two toothed.
pinions k, one of which is shown in position in Fig. 2. These pinions revolve on..
axles which are screwed into bosses on the inside of the wheel h and are reduced
to form ball bearings for taking the thrust of the pinions. The inner ends of
the axles k' are supported by the central boss of the chain wheel, and the axles are
held in position by pins or set screws.
In the arrangement shown the wheels cand e have each eighteen teeth, and the.
pinions k, eleven teeth, while the chain wheel has ten teeth. This in a machine
with a twenty-eight inch back wheel, and a ten toothed chain wheel on the crank
axle is equivalent to a fifty-six inch gear. It will be understood that wheels with
a different number of teeth may be used, and the chain wheel may have more or
less than two pinions.
It will be noticed that the chain wheel h is arranged to cover the space between
the flanges a³ and e¹ thus keeping the gearing free from dirt. The additional
weight of the gearing is small compared to the increased speed that can be
obtained, and by using two chain wheels of about the same size, the resistance of
the chain is considerably reduced.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed we declare that what we
claim.is:-
1. In rear driven cycles, fitting the hub of the back wheel with a bevilled.
toothed wheel, and gearing the same to a similar toothed wheel fixed to the back
leg of the cycle by one or more pinions carried by the driven chain wheel
substantially as shown and described in the accompanying drawings and
Specification.
2. The general arrangement and combination of the parts forming the cycle
gear shown and described in the accompanying drawings and Specification.
Dated this 20th day of February 1895.
W. H. POTTER, M.1.M.E.,
Newcastle Chambers, Nottingham, Patent Agent.