Improvements in Velocipede or like Driving Chains and Chain Wheels.
Year: 1898

page_text: Date of Application, 22nd June, 1898-Accepted, 13th Aug.,
1898
COMPLETE SPECIFICATION.
Improvements in Velocipede or like Driving Chains and Chain
Wheels.
We, RICHARD BLACKBURN, of Atlas Works, Kirkewhite Street, Engineer, and
ARTHUR GEORGE WIGFIELD, of 24, Beaumont Street, Sneinton, Mechanic, 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 ascer
tained in and by the following statement:-
-
This invention relates to improvements in velocipede or like driving chains
and chain wheels for communicating rotary movement from one shaft or axle to
another, or to the road driving wheel, and it has for its object the reduction of
the friction between said chain and chain wheels.
The invention will be best understood by reference to the accompanying draw-
ings, in which
Fig. 1 is an elevation.
Fig. 2 a plan of the inner side, and
Fig. 3 a vertical cross section taken on line X X of Fig. 1 showing a chain
constructed according to our invention.
Fig. 4 is an elevation, and
Fig. 5 a plan of a segment of a chain wheel constructed according to our inven-
tion.
Like letters indicate like parts throughout the drawings.
According to this invention the chain is built up of what are known as blocks A
of a suitable length and breadth, which blocks alternate with and are connected
together by pairs of side plates B, the ends of said plates and blocks being con
nected by transverse pins C, passing through the plates B and blocks A in the
usual manner.
In side elevation each block a is formed with an arch shaped middle portion 1)
thus providing an approximately semi-circular recess E in or near the middle of
the inner side of each as shown.
In cross section (see Fig. 3) the arched part 1) of each block is V shaped round
the recess E as shown.
Each chain wheel F (see Figs. 4 and 5) is provided with anti-friction rollers G
which latter are formed with V shaped grooves G₁ as shown. The size of the
rollers G and the angle of the sides of the grooves G¹ is so adjusted that the bottom
of the groove will accurately fit into the recess E in the blocks of the chain, whilst
the V shaped sides of the grooves will fit the V shaped portion of the arch D of
each block A.
The anti-friction rollers G are pivotted between arms H extending from the
rim I of the chain wheel, on pins which pass through the said rollers and arms
as shown.
The arms H are extended beyond the anti-friction rollers G as shown, in order
to prevent the chain from being displaced.
The position of the rollers G is so adjusted as to hold the side plates B of the

page_text: chain clear of the rim I of the wheel, and thus the only points where the wheel
and chain come into contact with each other, is confined to the anti-friction
rollers G of the one and the recesses F in the block A of the other.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. A velocipede or like driving chain formed of blocks such as A alternating
with and connected together by side plates B each block A being formed with a
recess E to engage with an anti-friction rollers on the chain wheel substantially as
described.
2. A velocipede or like driving chain formed of blocks such as A alternat-
ing with and connected together by side plates B the said blocks A being each
formed with a recess D and V shaped round the recess to engage with grooved
anti-friction rollers on the chain wheel substantially as described.
3. The combination with a velocipede or like driving chain provided with blocks
such as A each formed with a recess E and V shaped round the recess of a chain
wheel provided with anti-friction rollers G formed with V shaped grooves G¹ to
fit in the recess in the blocks and arms H extending beyond the anti-friction
rollers G substantially as described.
4. The combination and arrangement of parts constituting the complete velo-
cipede or like driving chain and chain wheel substantially as described and illus
trated in the accompanying drawings.
Dated this 20th day of June 1898.
RICHARD BLACKBURN.
ARTHUR GEORGE WIGFIELD.
Boult & Wade,
Agents for the Applicants.