An Improvement relating to the Driving Mechanism of Cycles.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
An Improvement relating to the Driving Mechanism of Cycles.
I, NOAHI MITCHELL, of 194, Regent Street, County of London, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention has for object, the construction of check teeth of flat forma-
tion on a boss or ring affixable to the spindle or axle of, say, the hind or driver
wheel of a cycle, and of a series of flat pawls in the boss or collar of the chain
driven wheel, to gear therein when moving in one direction and to slip such
as when the machine is travelling down an incline with the brake on.
The axle collar has the teeth and hollows in set distances apart on and in its
periphery, and the pawls are hung from recesses in the boss of the chain wheel
at equal distances apart for balancing purposes and to prevent jumping the
flatness preventing rattle or noise during the running.
When the chain wheel is being driven by the chain, the pawls engage the
teeth, and not otherwise.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Noah Mitchell.
An Improvement relating to the Driving Mechanism of Cycles
I, NOAH MITCHELL, of 194, Regent Street, County of London, 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 follow-
ing statement:-
This invention has for object, the provision of an improved sprocket wheel
clutch embodying in its construction check teeth of flat formation on a boss or
ring affixable to the hub of, say, the hind or driver wheel of a cycle, and of a
series of flat pawls in the boss or collar of the chain driven wheel, to gear therein
when moving in one direction and to slip such as when the machine is travelling
down an incline with the brake on.
The hub collar has the teeth and hollows in set distances apart on and in its
periphery, and the pawls are hung from recesses in the boss of the chain wheel
at equal distances apart for balancing purposes.
When the chain wheel is being driven by the chain, the pawls engage the
teeth, and not otherwise.

page_text: My invention is shown on the annexed drawings.
Figure 1 interior elevation with side ring plate removed.
Figure 2 section through line a, a, Figure 1 of complete wheel.
Figure 3 detached elevation of square faced toothed inner wheel.
Figure 4 elevation of chain wheel detached to show the segment ribs of the
inner periphery.
Figure 5 plan of the two side ring plates holding pawls.
Figure 6 perspective of one side ring plate and pawls in position they rela-
tively enjoy when in the chain wheel.
A, chain wheel of ring band form with chain engagement teeth B on the
outer periphery.
C, C, C, segmental ribs within said chain wheel A, said ribs affording between
adjacent ends space for the play of the pawls F. D, D, screw holes in said
ribs C. E, E, side ring plates fitting flush in recess of chain wheel A and
against ribs C, C, C, to which they are secured by screws passed through holes J
and D.
F, F, F, drop pawls of square edged form hung by pins G from side ring
plates E, E.
H, square faced teeth on outer periphery of inner ring I, the inner periphery
being screw threaded for attachment to the hub of the rear wheel of a bicycle
or rear driven tricycle.
J, J, holes in side-ring plates E for securing by screws the several parts together
and constitute a double actioned apparatus for attachment to the hub of a wheel
for propulsion by chain gear through the pawls F, F, engaging within the
teeth H of the band I of the wheel of the vehicle, or for the vehicle wheel to
run freely, such as when descending a hill, through the teeth H of the inner
band moving away from the pawls F, F, while the wheel is rotating for for-
ward travel.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what
I claim is:
1. As part of the driven wheel of a cycle, a band A, inner segmental ribs C,
side plates E as carriers of slip pawls Fenclosed thereby, square faced teeth H
of inner band I, also enclosed by said side plates E, E, as specified.
2. In driving mechanism for cycles, a sprocket wheel clutch comprising a
sprocket wheel having interior spaced segmental ribs, a toothed wheel located
within said sprocket wheel and adapted to be secured on a hub, plates secured
to said ribs on opposite sides respectively of the sprocket wheel, and pawls sup-
ported by and between said plates in the spaces between said ribs and adapted
for engagement with said toothed wheel, substantially as described.
The 20th day of September 1899.
The 20th day of September
1899.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Noah Mitchell.