An Improved Chain Belt and Wheel applicable to Cycle and other Chain Driving Gears.
Year: 1897

page_text: Date of Application, 17th Aug., 1897-Accepted, 4th Dec.,
1897
COMPLETE SPECIFICATION.
An Improved Chain Belt and Wheel applicable to Cycle and other
Chain Driving Gears.
We, JAMES BARRETT, Farmer, ISAAC STEVENS, Farmer, and ROBERT SUTHER-
LAND, Engineer all of Hopetown, County of Borung in the Colony of Victoria,
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.
The object of our invention is to provide a chain power transmission gear which
shall not only possess a certain modulus of elasticity but in which the chain
forms practically an endless externally toothed flexible rack. Notwithstanding
the success of ordinary chain as applied to cycles, motor vehicles and other pieces
of mechanism in which power is transmitted its use has not always proved of the
most satisfactory character. This is due to several causes. Firstly because
ordinary block chain does not lend itself readily to sudden or unexpected strains
or shocks. Secondly as the full load on the ordinary type of chain hangs princi-
pally on one tooth only an uneven and hard wearing tooth is the result. Thirdly
the stretching of the pitch renders the chain or sprocket unusable long before
either of them are worn out. All the above mentioned difficulties were experienced
in the chains hitherto used but with our invention these objections to chain
driving are overcome and new purposes for its use are presented.
Our invention which is applicable to all classes of chain driven mechanism
consists of an endless chain having links and blocks, and outside driving levers
which chain at one end is driven by a sprocket wheel and the other end drives a
smooth faced wheel having flanges each side of it and radially extended driving
arms thereon.
But in order that our invention may be better understood we will now refer
to the accompanying sheet of drawings which are to be taken as part of this
specification and read herewith.
Figure 1 represents a perspective view of the driver and the driven wheel the
former being operated by a bicycle pedal and crank but as before said the inven-
tion is applicable to all purposes where power requires to be transmitted.
Figure 2 depicts a plan of the driven wheel shewing the flange on either side
of it.
Figure 3 shews in perspective a view of a chain having a solid driving lever
with a T bottom integral therewith.
Figure represents a perspective view of a chain in which the driving levers
are composed of plates the bottom of which form the links by which the blocks
are coupled together.
Figure 5 shews a perspective view of a solid driving lever having a Ṭ shaped
bottom forming the block and a T shaped top driving end. Both top and bottom
are integral with the lever.
Figure 6 represents a perspective view of a chain having links and blocks to
CD Q77

page_text: the sides of which links are pivotted levers. The outer end of each one of these
by diagonal stays is connected to its fellow.
Similar letters of reference indicate similar or corresponding parts where they
occur in the several views.―
On reference to the drawings and Figures 1 and 2 it will be seen that the driving
wheel A has protruding from its circumference a series of sprockets. These enter
the spaces formed between the links and the blocks in the chain and drive the
latter. The circumference of the driven wheel B is sprocketless but on each
of its sides, or side faces is a flange C. These flanges may either be integral with
the wheel or detachable therefrom and protruding from their circumference are
radially extended driving arms D. If applied to a bicycle we prefer for lightness
to stamp these flanges from sheet metal in which case the driving face lip E
after the plate is stamped is bent at right angles to the said flanges. As shewn
in the drawings the flanges are rivetted at 13 though as can be well understood
they may be attached in any suitable way.
On reference to Figure 3 it will be seen that the chain consists of links F
pivotted to which are the levers G having T shaped block bottoms H forming
the blocks in the chain. At their outer end these levers are provided with pro-
truding cross driving pins I which (as can be well understood) bearing against
the driving face lips E on the driving arms D communicate a rotary motion to
the driven wheel B as shewn in Figure 1. These cross pins may be brazed or
screwed into the lever end or as shewn on the left of Figure 3 they may have a
driving collar L on each side of the lever over which the pin is rivetted.
On reference to Figure 4 it is seen that ordinary solid blocks J are used but
that the sheet links V connecting the same have driving levers K extending out-
wardly. At their driving end these are connected by a pin M around the pro-
truding ends of which may be a driving collar L as seen to the right of the
figure.
On reference to Figure 5 it will be seen that the links N are pivotted to blocks O
from which blocks the driving levers P extend outwardly. At the outer ends of P
are protruding driving plates or faces which are integral with both and P.
In Figure 6 in which an ordinary link W and block X may be used it is seen
that outside of one end of each link is pivotted a driving lever R. Pivotally con-
nected to the outer end of this and to the driving pin S is a diagonal stay T.
The inner end of Tis pivotted near its middle at U to the driving lever R. A clearer
idea of the driving pin S is seen in the view to the right of the figure.
When applied to a diamond framed bicycle we find that with this chain con-
siderably better results are obtained as regards speed. It also throws much less
strain upon the rider when on common roads since the shock due to irregularities
in the road surface are not so readily transferred to the propeller of the machine
but are largely absorbed by the chain.
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:-
1st. An improved driven wheel applicable to cycle and other chain driving
gears consisting of a sprocketless wheel B having flanges C with radially extended
driving arms D and lips E all as and for the purposes herein before described and
as illustrated in the drawings.
2nd. An improved chain belt applicable to cycle and other chain driving gears
consisting of links F pivotted to blocks H radially extending from and integral
with which blocks are driving levers G having at their outer ends protruding
cross driving pins I all as and for the purposes hereinbefore described and as
illustrated in Figure 3.
3rd. An improved chain belt applicable to cycle and other chain driving gears
consisting of blocks J connected together by sheet links V integral with and
radially extending from which are driving levers K connected together at their
4

page_text: outer ends by driving pins M protruding from the outside faces of the levers
all as and for the purposes hereinbefore described and as illustrated in Figure 4.
4th. An improved chain belt applicable to cycle and other chain driving gears
consisting of links N pivotted between which are blocks 0 radially extending
from and integral with which blocks are driving levers P having at their outer
ends integral and protruding driving faces Q all as and for the purposes herein-
before described and as illustrated in Figure 5.
5th. An improved chain belt applicable to cycle and other chain driving gears
consisting of links W and blocks X to one pin in each link of which is pivotted
a driving lever R at the outer end of which is a protruding driving pin S to
which one end of a diagonal stay T is pivotted the other end being pivotted to R
at U all as and for the purposes hereinbefore described and as illustrated in
Figure 6.
6th. An improved driven wheel applicable to cycle and other chain driving
gears consisting of a sprocketless wheel B having flanges C with radially extended
driving arms D and lips E in combination with a chain consisting of links F
pivotted to blocks H radially extending from and integral with which are driving
levers G having at their outer ends protruding cross driving pins I all as and
for the purposes hereinbefore described and as illustrated in the drawings.
7th. An improved driven wheel applicable to cycle and other chain driving
gears consisting of a sprocketless wheel B having flanges C with radially extended
driving arms D and lips E in combination with a chain consisting of blocks J
connected together by sheet links V integral with and radially extending from
which are driving levers K connected together at their outer ends by driving
pins M protruding from the outside faces of the levers all as and for the pur-
poses hereinbefore described and as illustrated in the drawings.
8th. An improved driven wheel applicable to cycle and other chain driven
gears consisting of a sprocketless wheel B having flanges C with radially extended
driving arms D and lips E in combination with a chain consisting of links N
pivotted between which are blocks O radially extending from and integral with
which are driving levers P having at their outer ends integral and protruding
driving faces Q all as and for the purposes hereinbefore described and as illus-
trated in the drawings.
9th. An improved driven wheel applicable to cycle and other chain driving
gears consisting of a sprocketless wheel B having flanges C with radially extended
driving arms D and lips E in combination with a chain consisting of links W
and blocks X to one pin in each link of which is pivotted a driving lever R at
the outer end of which is a protruding driving pin S to which one end of a
diagonal stay T is pivotted the other end being pivotted to R at U all as and for
the purposes herein before described and as illustrated in the drawings.
Dated this 17th day of Anonat 1907
HERBERT HADDAN & Co.,
Agents to Applicants 18 Buckingham Street Strand London.