Free-wheel Ratchet Clutch for Driving Cycles and other Vehicles and for Actuating Back Pedalling Brakes.
Year: 1899

page_text: Date of Application, 11th Nov., 1899
Complete Specification Left, 13th Aug., 1900-Accepted, 22nd Sept., 1900
Free-wheel Ratchet Clutch for Driving Cycles and other Vehicles
and for Actuating Back Pedalling Brakes.
ALFRED NICKLIN, 44, Kerrison Road, Battersea, in the County of Surrey, and
GEORGE MAUDE, 173, Buckingham Palace Road, London, in the County of
Middlesex, Cycle Engineers do hereby declare the nature of this invention to be
as follows:-
-
The invention consists of an ordinary chain wheel into the interior of which
are placed one or more pawls (preferably six) that are dropped into recesses cut
in the inner circle of chain wheel, thereby forming fulcrums, in a novel manner
(without pins or screws), from which the said pawls work of their own weight,
and ongage with a suitable ratchet ring, that is screwed or fixed by other suitable
means on to hub of cycle or other vehicle, thereby giving positive grip, when
cycle or other vehicle is driven forward, free and silent running when released.
This ratchet clutch may also be applied to crauk axle of cycles or other vehicles
fo actuate a back pedaling brake.
Dated this 11th day of November 1899
GEORGE MAUDE.
ALFRED NICKLIN.
Free-wheel Ratchet Clutch for Driving Cycles and other Vehicles
and for Actuating Back Pedalling Brakes.
We, ALFRED NICKLIN, of 16, Kandahar Road, Battersea, in the County of
Loudon (late of 44 Kerrison Road Battersea, London in the County of Surrey)
and GEORGE MAUDE, of 42, Eccles Road, Lavender Hill, in the County of London
(late of 173, Buckingham Palace Road, London, in the County of Middlesex),
Cycle 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 an improved ratchet clutch for driving cycles and other
vehicles with free wheels such clutch being also applicable for actuating back
pedalling brakes.
This invention consists of an ordinary chain wheel into the interior of which
is ar are placed one or more pawls. These pawls drop into recesses cut in the
inner portion of the chain wheel, thereby forming fulcrums in a novel mauuer,
without the aid of pins or screws, from which the pawls work by their own
weight, and engage a ratchet ring screwed or otherwise suitably fixed on to the
ID 971

page_text: hub of the driving wheel thereby giving a positive grip when the cycle or other
vehicle is driven forward, but running free and silent when released.
And in order that our said invention may be better understood we will now
proceed to describe the same with reference to the drawing accompanying this
specification in which Fig. 1 shews an elevation of a chain wheel with one of the
plates removed in order that the clutch mechanism may be seen:
Fig. 2 shews
section through the line A B Fig. 1: Fig. 3 shews elevation of one of the pawls:
Fig. 4 side view of the same: Fig. 5 portion of the chain wheel with one of the
recesses. Figs. 3, 4, and 5 are drawn to a larger scale than the other figures.
Fig. 6 shews one of the covering plates detached: Fig. 7 shews bolts and nuts
for securing the same. Fig. 8 shews one way of adapting our invention to back
pedalling brakes.
The same letters of reference denote the same parts in all the views.
ashews an ordinary chain wheel. shews the inner portion of chain wheel a.
In the portion b are cut recesses c. d shews pawls, the ends d' of which are shapod
so as to fit loosely in the recesses c. e shews a ratchet ring screwed or otherwise
suitably fixed on to the hub of the driving wheel of the cycle or other vehicle.
It will be seen on reference to Fig. 1 of the drawing that upon the chain
wheel a being rotated, two or more of the pawls d will drop by their own weight
on to the ratchet ring and engage therewith. In the drawing we have shewn
three of such pawls engaging the ratchet ring. It will he observed that the
hub of the driving wheel is free to turn in a forward direction, as indicated by
the arrow's flight at Fig. 1, together with the ratchet ring e when the chain
wheel a is not being rotated. Although we have shewn the chain wheel a pro-
vided with nine pawls we do not wish to confine ourselves to this particular
number as we may employ a greater or lesser number as may be found most
advantageous in practice.
The pawls are so formed that their ends drop easily into the recesses c
aud are held therein in position when the plates fare fixed on the chain wheel a
(one on each side). By this means the pawls are perfectly free to engage the
ratchet ring 6.
With reference to Fig. 8, 9 shews a pin fixed on the periphery of a wheel a
which in this case would be a plain, wheel, i.e. without teeth. The wheel a which
contains clutch mechanism similar to that before described and shewn at Fig. 1
in the chain wheel a, is keyed or otherwise suitably fixed on to the pedal crank
axle. shews a rod connected at one end to the projection g and at the other
end to the band of a band brake. The clutch mechanism is brought into action
by back pedalling, thus when the wheel a¹ is turned it will pull the rod thus
actuating the band brake. The wheel a' will return to its norinal position by the
action of the spring of the brake on releasing the clutch mechanism.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is:-
-
1. In clutch mechanism, the method of fitting pawls loosely in recesses in the
chain wheel of the driving wheel of cycles and other vehicles, in combination
with a ratchet ring substantially as and for the purpose set forth.
2. Clutch mechanism such as that claimed in the preceding claim, fixed on
the crank axle of cycles or other vehicles for operating back pedalling brakes.
Daten this 19th may vi August 1900.
BROWNE & Co.,
Agents for the Applicants,
9, Warwick Court, Gray's Inn, London, W.C.