Improvements in Driving Chains and Chain Wheels.
Year: 1897

page_text: Date of Application, 27th Aug., 1897
FL
2000
L
1000
PROVISIONAL SPECIFICATION.
Improvements in Driving Chains and Chain Wheels.
We, THOMAS Coxon, of 83, Woodborough Road, Watch-maker and Jeweller,
and CILARLES EDWIN BRASHER, of 241, Woodborough Road, Gentleman, both in
the City of Nottingham, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in driving chains and chain wheels for
transmitting the motion of the crank axle of a velocipede or the like to the road
driving wheel. It is also applicable to driving chains and chain wheels
generally.
In carrying out this invention the chain is formed of side plates or links con-
nected together by transverse joint pins in the usual manner, a suitable space
being left between the side plates on one side and those on the other.
Mounted on each transverse joint pin between the side plates are two antifriction
wheels and between the said wheels is an anti-friction roller. of less diameter.
The anti-friction wheels are formed with a V shaped periphery or a knife edge,
whilst the rollers are formed with a central V shaped groove.
The two anti-friction wheels and the intermediate anti-friction roller may be
formed independently of or integrally with each other, and if preferred they may
be mounted on bosses formed on the side plates instead of the joint pins, the latter
being carried through the interior of the said bosses.
Each chain wheel is formed with two V shaped grooves in its periphery to
receive the shaped edges of the anti-friction wheels on the chain, and the teeth
on the wheel are placed between the said grooves. The teeth of the chain wheel
may be formed in side elevation approximately triangular, and their edges are V
shaped or formed with knife edges and engage in the V shaped grooves in the
anti-friction rollers of the chain.
L
1
1907

page_text: both in the City 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:-
This invention relates to improvements in driving chains, and chain wheels, for
transmitting the motion of the crank axle of a velocipede or like road vehicle, to
the road driving wheel or wheels.
It is also applicable to driving chains and chain wheels generally.
The invention will be best understood by reference to the accompanying draw-
ings in which
Fig. 1 is an elevation, and
Fig. 2 a plan, partly in section, of a chain constructed according to our
invention.
Fig. 3 is an elevation, and
Fig. 4 a plan of a segment of a chain wheel, constructed according to our
invention.
Fig. 5 is a vertical cross section of the chain and rim of the chain wheel.
Like letters indicate like parts throughout the drawings.
In carrying out this invention the chain is built up of pairs of outer side
plates A (see Figs. 1 and 2.) alternating with pairs of inner side plates B, con-
nected together by transverse joint pins C in the usual manner.
The ends of the inner side plates B are preferably secured to the ends of bearing
sleeves D, which latter are mounted loosely on the joint pins C, in order to form a
wide bearing at each joint. The pins C are fixed in the outer side plates A.
Mounted on each sleeve D is an anti-friction roller E provided with side
flanges of greater diameter than the middle portion E.
The rim of each chain wheel (see Figs. 3, 4, and 5) is formed with two grooves G
in its rim to receive the edges of the flanges F of the anti-friction rollers E of
the chain, and the teeth H of said wheel are placed between the grooves G. Each
anti-friction roller E may be formed integrally with the flanges F as shown, or the
latter may be formed and mounted on the sleeve D independently of the middle
part or roller E.
The teeth H of the chain wheel may be of the usual form in side elevation, but
their edges are preferably made approximately V shaped or bevelled off as shown
in order to prevent them from possibly engaging with the flanges F of the
rollers E.
When the chain is in position on the chain wheel, the flanges F take a bearing
in the grooves G in the rim as shown in Fig. 5 whilst the teeth H of the chain
wheel merely bears against the anti-friction rollers E in the act of driving, and
consequently the friction between the chain and chain wheel is thus reduced to
a minimum.
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 a driving chain providing the anti-friction rollers E which engage with
the teeth of the chain wheel with side flanges F to take a bearing on the rim
of the chain wheel substantially as described.
2. In a driving chain the combination with anti-friction rollers E to engage
with the teeth of the chain wheel of independent side rollers of greater diameter
to take a bearing on the rim of the chain wheel substantially as described.
3. The combination with a chain provided with flanged anti-friction rollers
such as E F or rollers E and side rollers of greater diameter of a chain wheel pro-
vided with grooves G to receive the flanges F or side rollers substantially as
described,

page_text: 4. The combination and arrangement of parts constituting the complete driving
chain and chain wheel substantially as described and illustrated in the accom-
panying drawings.
THOMAS COXON.
CHARLES EDWIN BRASHER.
Boult & Wade,
Agents for the Applicants.