mprovements in and connected with the Crank and Chain Wheel of Cycles and similar Vehicles.
Year: 1893

page_text: Date of Application, 9th Sept., 1893
Complete Specification Left, 11th June, 1891-Accepted, 14th July, 1894
PROVISIONAL DI.
mprovements in and connected with the Crank and Chain Wheel
of Cycles and similar Vehicles.
We, HUMBER, SYNYER & COY. LTD., of Crocus Street, Nottingham, Cycle
Manufacturers, and JAMES HODSON, of Mona Street, Beeston, Mechanic, both in
he County of Nottingham, do hereby declare the nature of this invention, to be
s follows:-
The object of this invention is to provide means of attaching and combining
he crank with the interchangeable chain wheels of all kinds of cycles, so that the
rank and wheel, when secured together, shall occupy less space, or project a
ess distance from the wheel or frame of the cycle, than is the case with the crank
and chain wheels as heretofore constructed, and, at the same time, that the wheels
or cranks may be easily detached for the substitution of similar chain wheels and
cranks having different dimensions.
For the purpose of our invention, the crank and chain wheels may be advan-
The inside of the axle end of the
tageously constructed in the following manner.
crank is provided with a number of arms or projections (preferably five) which are
forged or cast in one piece with the crank, the said arms being of such form that
they will fit into a similar number of suitably recessed spokes or arms of the chain-
wheel, in such a manner that they may be secured thereto by screws, or otherwise,
the axle end of the crank constituting the boss of the chain wheel. The chain
wheel being constructed without any boss, and the spokes being recessed or bent to
receive the arms of the crank, when it is desired to attach a chain wheel to the
crank, the said wheel is passed over the crank, and the arms thereof fitted over
the arms of the crank, and secured thereto by two or more screws, or their
equivalent.
If the number or arrangement of spokes in the chain wheel be such that one of
the arms or spokes would coincide with the crank, such arm or spoke is not recessed
or bent, but is made short enough to allow the easy passage of the wheel over the
crank, or may be absent from the wheel.
Instead of the arms or projections, a disc, or flange, may be formed upon the
crank, the periphery, edge, or edges of which may be turned to fit truly recesses
formed by turning, or otherwise, in the arms or spokes of the hubless chain-
wheel.
Or the said disc, flange, arms, or projections upon the axle end of the crank
may be recessed, or suitably shaped to receive flat arms, or their equivalent, formed
upon the chain wheel, and secured thereto by screws, or otherwise.
It is obvious that, by modification, this invention may be applied to any form of
cycle to which detachable chain wheels can be, at present, applied.
1002

page_text: Improvements in and connected with the Crank and Chain Wheel
of Cycles and similar Vehicles.
We, HUMBER, SYNYER AND COMPANY, LIMITED, of Crocus Street, Nottingham,
Cycle Manufacturers, and JAMES HODSON, of Mona Street, Beeston, Mechanic,
both in the County of Nottingham, 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, reference being had to the
accompanying drawings and to the letters and figures marked thereon, that is
to say:
The object of this invention is to provide means of attaching and combining
the crank with the interchangeable chain wheels of all kinds of cycles, so that the
crank and wheel, when secured together, shall occupy less space, or project a less
distance from the wheel or frame of the cycle, than is the case with the crank and
chain wheels as heretofore constructed, and, at the same time, that the wheels or.
cranks may be easily detached for the substitution of similar chain wheels and
cranks having different dimensions.
For the purpose of our invention, the crank and chain wheel are constructed in
the following manner :-The inside of the axle end of the crank is provided with
a number of arms or projections (preferably five) which are forged or cast in one
piece with the crank, the said arms being of such form that they will fit into a
similar number of recessed spokes or arms of the chain wheel in such a manner
that they may be secured thereto by studs, screws, or otherwise, the axle end of
the crank constituting the boss of the chain wheel. The chain wheel being
constructed without a boss, and the axle end of the crank being so formed that the:
wheel can pass over it when it is desired to attach a chain wheel to the crank, the
said wheel is passed over the crank, and the arms thereof fitted over the arms of
the crank and secured thereto by one or more screws or their equivalent.
If the number or arrangement of spokes in the chain wheel be such that one of
the arms or spokes would coincide with the crank, such arm or spoke is not recessed
or bent, but is made short enough, and of such shape, as to allow the easy passage
of the wheel over the crank, or may be absent from the wheel.
Instead of the arms or projections, a flange may be formed upon the crank and
may be turned to fit recesses formed by turning, or otherwise, in the arms or spokes
of the hubless chain-wheel.
Or the arms of the wheel instead of being recessed may be flat, and a recessed
flange or recessed arms formed upon the axle end or boss of the crank to which
said flat arms, or their equivalent, may be suitably secured.
.
Our invention will be better understood by reference to the annexed drawings, in
which :-
--
Fig. 1, shows a chain wheel constructed according to our invention, and having
recessed arms.
Fig. 2 shows the boss or axle end of a crank to fit such chain wheel.
Fig. 3 is a section showing the wheel and crank secured together.
Fig. 4 is a detail view showing a section of one of the arms on line x, x.
Fig. 5 is a plan, and Fig. 6 á section of the central portion of a wheel and crank
boss, showing a modification in which the arms are flat.
Fig. 7 represents the central portion of a modification in which a flange on the
crank boss fits into a recess in the wheel.
Fig. 8 shows the crank boss or axle end employed with this modification, and
Fig. 9 is a section showing the wheel and crank secured together.
For light or racing cycles, we prefer to employ the arrangement shown in
Figs. 1 to 3. a is the hubless chain-wheel, which is provided with arms or spokes b
having recesses c. dis the crank whose axle end d', constitutes the boss for the
5

page_text: "
chain wheel, and is formed with projections e, adapted to fit into the recesses c, and
to be secured firmly in position therein by means of screws f, passing through
holes in the arms of the chain wheel. The arm 6', which coincides with the
crank when the parts are fitted together, is made shorter than the arms b, and is
not recessed. It is secured to the crank by a screw passing through a block or
filling piece b. On the crank itself is formed a projection d³ in order to balance
the wheel.
A
In the inodification shown in Figs. 5 and 6, the arms or spokes 6 of the wheel
are flat. and fit into a recess formed by projections h upon the boss of the crank.
A shoulder i is turned upon the crank boss d' for the purpose of centring the wheel
thereon, and against this, the centre of the wheel fits. The wheel and crank are
secured by countersunk screws passing through the projections h and the arms b.
For heavier cycles, we employ the modification shown in Figs. 7 to 9.
flange jis formed on the crank boss d', and is provided with arms k so arranged
that when the said flange is fitted into a recess 1, formed at the centre of the
wheel, the said arms & can be made to correspond with the arms or spokes b, of the
wheel. The fitting of the wheel upon the crank is facilitated by a shoulder m,
which the surface n is turned to fit, the periphery of the flange j being also turned
to fit the recess 1.
It is obvious that by suitable modifications a crank and chain wheel constructed
according to this invention may be applied to any form of cycle to which detachable
chain wheels can be at present applied.
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 cycles and similar vehicles, a crank having spokelike arms or projections
adapted to be secured to a corresponding number of spokes or arms on the chain
wheel, the axle end of such crank constituting the boss for the chain wheel,
substantially as and for the purposes described.
2. In cycles and similar vehicles, the combination with a crank d having arms or
projections, such as e, formed at its axle end, of a hubless chain wheel a having
recessed spokes or arms b to which are secured the arms or projections of the said
crank, substantially as described.
3. In cycles and similar vehicles, a chain-wheel so constructed that it can be
passed over the pedal crank and be fixed upon that end of the said crank which is
secured or keyed to the axle of the cycle, and a pedal crank having a boss
constructed to receive such a wheel, Bubstantially as herein described and shown.
4. The modified arrangement of crank and hubless chain wheel in which the arms
or projections of the crank are replaced by a disc or flange adapted to fit recesses
in the arms or spokes of said chain wheel, as described and shown with reference to
Figs. 7, 8, and 9.
5. The modified arrangement of crank and hubless chain wheel, in which the
arms of the wheel are flat and are adapted to fit into a circular recess upon the
crank, as described and shown with reference to Figs. 5 and 6.
6. Our improvements in and connected with the crank and chain wheel of cycles
and similar vehicles, substantially as described and shown with reference to the
annexed drawings.
Dated this 11th day of June 1894.
ERNEST DE PASS,
Chartered Patent Agent,
78, Fleet Street, London, and 6, Victoria Street, Nottingham,
Agent for the Applicants.