Improvements in Chain Gearing for Cycles and other purposes.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Chain Gearing for Cycles and other purposes.
I, SAMUEL BENNETT, of 19 Gloucester Place, Liverpool, in the County of Lancashire,
Joiner and Contractor, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the construction and arrangement of the chains and wheels,
of chain-gearing generally, and more particularly that employed in connection with
cycles, and embraces modifications or improvements having for their object to increase
the general efficiency of such gearing.
For this purpose I employ a chain built up of links having either flat or
convex sides and each presenting in side elevation the form of an inverted parabola,
having an axis slightly less in length than its base or double ordinate, and surmounted
by a triangle having side projections at its apex, these links being hinged together,
edge to edge by means of bolts, rivets, or the like, passing through suitable projections
extending from the ends of said links at points at or near the ends of the base of the
triangle.
The larger wheel of the gearing I form with equidistant recesses or openings in its
periphery to receive the bottom or inner portions of the links, whilst the smaller,
wheel I form with an annular groove on its periphery nearly equal in depth to that of
the links of the chain. In the bottom of this groove I form recesses or openings
with which the bottom or inner portions of the links will engage, whilst at each side.
of said groove I form other notches or recesses on the periphery of the wheel with
which the side projections at the apex of the triangular portions of the links will
engage.
The chain of gearing so constructed and arranged thus gears on its outer edge
with the smaller wheel, and on its inner edge with the larger wheel, whilst, owing to
the particular shape of its links, the chain will engage with and leave the wheels with
little friction.
I, SAMUEL BENNETT, of 19 Gloucester Place, Liverpool, in the County of Lancashire,
Joiner and Contractor, 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 :-
My invention relates to the construction and arrangement of the chains and wheels

page_text: of chain-gearing generally, and more particularly that employed in connection with
cycles, and embraces modifications or improvements having for their object to increase
the general efficiency of such gearing.
For this purpose I employ a chain built up of links having either flat or convex
sides and each presenting in side elevation the form of an inverted parabola, having
an axis slightly less in length than its base or double ordinate, and surmounted by a
triangular shaped portion baving side projections at its apex, these links being hinged
together edge to edge by means of bolts, rivets, or the like, passing through suitable
projections extending from the ends of said links at points at or near the ends of the
base of the triangular shaped part.
The larger wheel of the gearing I form with equidistant recesses or openings in its
periphery. to receive the bottom or inner portions of the links, whilst the smaller
wheel I form with an annular groove on its periphery nearly equal in depth to that
of the links of the chain. In the bottom of this groove I form recesses or openings
with which the bottom or inner portions of the links will engage, whilst at each side
of said groove I form other notches or recesses on the periphery of the wheel with
which the side projections at the apex of the triangular portions of the links will
engage.
The chain of gearing so constructed and arranged thus gears on its outer edge
with the smaller wheel, and on its inner edge with the larger wheel, whilst, owing to
the particular shape of its links, the chain will engage with and leave the wheels with
little friction..
In order that my invention may be more easily understood and carried into
practical effect I will now describe it with reference to the accompanying sheet of
drawings.
The same letters roprosent similar parts in all the figures.
Fig. 1 represents a side elevation of one complete link a having the projections 6 at
the apex of its triangular shaped part and the projections 61, 62, at either side thereof
whereby the link is hinged to other links by means of rivets passing through suitable
openings c.
Figs. 2, 3 and 4 show the component parts of said links, consisting of the two
side plates d having their lower parts curved, which are fitted together with their
concave sides facing one another and having the flat plate e situated between them.
These three plates are fixed together by suitable rivets passing through the
holes f
Fig. 5 is a longitudinal section of Fig. 1 on the line a¹, x1.
Fig. 6 is a cross section of Fig. 1 on the line x, x.
Fig. 7 shows the larger gear wheel having openings or recesses formed in the
periphery thereof by means of the spaces at regular distances, and the circular
plates n, the latter being situated one on either side of the rim of the gear wheel and
being secured to one another and to the gear wheel by means of screws or rivets f¹.
The lower half of this larger gear wheel is shown with the plates n removed; and a
portion of the chain is shown with the bottoms or inner portions of the links gearing
with the said recesses in the periphery of the said gear wheel.
Fig. 8 and Fig. 9 are sectional views of Fig. 7 on the lines y y, and y¹ y
respectively.
Fig. 10 is a side elevation of the smaller gear or hub wheel and Figs. 11 and 12 are
sectional views of Fig. 10 on the lines and ¹z' respectively. This smaller gear
wheel is constructed of two circular side plates m, preferably having portions thereof
cut away at regular intervals so as to form the arms t, secured one to either side of a
central star-shaped plate p, by means of suitable rivets or screws s, thus forming the
recesses r into which the bottoms or inner portions of the links of the chain pass,
while the side projections b at the top or apexes of the links of the chain gear
with the cup-shaped recesses m¹ formed on the extremities of the arms of the
plate m.
The chain thus gearing on its outer edge with the smaller gear wheel and on its
inner edge with the large gear wheel.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
(1.) In chain gearing a chain having each of the links thereof in the form of
an inverted parabola having an axis slightly less in length than its base or double
ordinate and surmounted by a triangular shaped portion and being composed of
the three plates d d and e, suitably riveted together and having the cross-piece b
and projections 61 substantially as and for the purpose described and illustrated
in the accompanying drawings.
(2.) In chain gearing the larger gear wheel having recesses or openings
formed in the periphery thereof by means of the spaces and the circular
plates n substantially as and for the purpose described and illustrated in the
accompanying drawings.
(3.) In chain gearing the smaller gear wheel having its periphery formed in the
shape of a deep annular groove by means of the side plates. m suitably riveted
to the central star-shaped plate p, and having portions thereof cut away at regular
intervals to form the arms t having cup-shaped recesses m¹ at the extremities
thereof substantially as and for the purpose described and illustrated in the
accompanying drawings.
(4.) Chain gearing consisting of a chain composed of the links a the inner
portions of which gear with the recesses or openings formed in the periphery of
the larger gear wheel thereof and the projections 6 on the apexes of which gear
with recesses or notches formed in the periphery of the smaller gear wheel thereof
substantially as and for the purpose described and illustrated in the accompanying
drawings.
רד
1008
CASTLE SMITH,
"Invention" Office, Mitro Court, Fleet Street, London, E.C.,
Agent for the Applicant.