Novel Combination of Means for Use in Fixing a Detachable Chain Wheel and Crank to One Another, and to the Orank Axle i of a Cycle.
Year: 1895

page_text: Date of Application, 12th Nov., 1895-Accepted, 28th Dec., -1895-
:
GOMET DELE DI MULTIVATION,
A Novel Combination of Means for Use in Fixing a Detachable
Chain Wheel and Crank to One Another, and to the Orank Axle
i of a Cycle.
I, EDWARD LISLE, Managing Director of The Star Cycle Company (Sharratt
and Lisle) Limited, of Star Cycle Works, Stewart Street, Wolverhampton in the
County, of Stafford, Cycle Manufacturers, 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 detachable chain wheels and cranks, of which each
chain wheel is formed with a sleovo to receive a crank, and together with the
crank is fixed to the crauk axle of a cycle by means of a cotter pin which is passed
transversely through the crank and is tightened up to bed or bind tightly against
the back of the hole through which it is passed in the crank and against a surface
formed partly by the bottom of a notch or flat cut in the side of the axle and
partly by the edges of a notch cut through the side of the sleeve. This method
of fixture is subject to the objection that, as the edges of the notch in the sleeve
are necessarily somewhat narrow, they are liable to yield under the series of
strains to which they are exposed in working, thus causing the wheel to work
louse, which greatly aggravates the mischief, besides causing the wheel to be
driven entirely or mainly through the axle instead of directly from the crank as
it is, in effect, so long as the joint is perfectly rigid.
Now, the object of this invention is to combine with the means of fixture above
described, further means of direct connection between the crank and wheel which
afford large bearing area between the parts through which the pressure or strain
passes, and thus ensure a permanently rigid joint, with the result that the strain in
working passes, in effect, always direct from the crank to the chain wheel, and
twisting strain on the axle is avoided or reduced to a minimum.
I will describe the invention with reference to the accompanying drawings, of
which,
Figure 1 is a sectional plan of the means above described of fixing a chain
wheel and crank to one another and the axle }
Figure 2 is a plan of Figure 1 with the crank removed, and shews also a part of
the means, according to this invention, for use in combination with the joint shewn
by Figure 1.
Figure 3 is a section taken in linea x of Figure 2.
Figure 4 is a side elevation of the parts shewn by Figure 2, as seen looking in
the direction of the arrow a.
Figure 5 is an elevation of the complete joint as seen looking from the opposite
side of the axle to that on which the arrow a is placed. And
Figure. 6 is an inner or back face view of the inner end of the crank.
A is the crank axle, and b a flat cut therein. Bis the chain wheel, and ca
sleeve formed therewith. This sleeve has a notch d cut therein which exposes two
narrow edges e. When the wheel is properly placed upon the axle, the faces of
the edges e are flush with the face of the flat b of the axle. C is the crank. fisa
cotter pin having a nut f¹ on a screwed part at its smaller end. The cotter pin f
is passed through a hole formed therefor through the crank, and when tightened
up bears against the flat.b of the axle and against the edges e of the sleeve, and
thus fixes together the crank, chain wheel, and axle. The edges e, however, being
1

page_text: very narrow, as they obviously must be to avoid the necessity of a heavy and
unsightly inner crank end, are liable to wear and cause a. loose joint, between
the crank and chain wheel and throw the whole twisting strain of the crank on the
axle, such twisting strain being intensified by the jerky movement due to the
looseness of the joint. This inconvenience is avoided, according to this invention,
by forming out from the inner face of the crank two teeth or lugs g, having their
faces which are opposite to one another parallol, and cutting corresponding flats g¹
on opposite sides of the nave or boss h of the chain wheel. When the parts are
put together, the faces of the lugs 9 which are opposite to one another fit
accurately across the flats g', and the bearing surface thus provided, in addition to
the bearing surface in contact between the cotter pin and the edges e of the
sleeve c, securely prevents the wheel B from working loose.
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:-
The combination, with means for fixing together a crank axle, chain wheel and
crank of a cycle, consisting of a notched sleeve, a notch or flat cut in the axle, a
cotter pin, and a hole through the crank to receive the cotter pin, all substantially.
as described, of teeth or lugs formed at the inner face of the crank and flats formed
on the nave or boss of the chain wheel, substantially as described, for the purpose
Bet forth.
Dated this 11th day of November 1895.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicant.