Improvements in Eccentric Chain Adjustments for Cycles.
Year: 1897

page_text: Improvements in Eccentric Chain Adjustments for Cycles.
I, GEORGE PILKINGTON MILLS, of The Woodlands, Beeston, in the County of
Nottingham, Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improvements in the axles of hubs which carry
eccentrics for the purpose of altering the position of the hub to effect adjustment
of the chain, and also to the securing of the axle in position. According to my
invention, instead of fixing separate eccentrics to the hub axle in the usual
manner, I form the eccentrics in one piece with the axle: this method removes
any possibility of alteration of the position of the eccentrics, thereby ensuring the
accurate alignment of the wheel. With reference to the accompanying draw-
ings: Fig. 1, shows an axle A having formed on it the eccentrics E, E, which
fit into recesses in the cycle frame F, F. The adjustment of the chain is effected
by slackening the nuts N, N, and turning the whole axle to or fro, the square
being provided for a spanner for the purpose. The axle is then secured in posi-
tion by tightening up the nuts N, N. Fig. 2 shows a slight modification.
S
In this case the screwed nortions B, B, fit into holes or slots in the cycle frame.
Fig. 3 shows an axle similar to that in Fig. 1, except that the screwed
portions B, B, are concentric with the axle A instead of with the eccentrics E, E.
Dated this 18th day of March 1897
COMPLETE SPECIFICATION.
Improvements in Eccentric Chain Adjustments for Cycles.
I, GEORGE PILKINGTON MILLS, of The Woodlands, Beeston, in the County of
Notts, Civil Engineer, 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 chain adjusting devices in which eccentrics are
employed, and it consists of improvements hereinafter more particularly specified.
In the accompanying drawing which illustrates this invention:
Figure 1 is a view in transverse section of the hub of a driving wheel of a
cycle embodying this invention, and Figures 2 and 3 are similar broken views
showing modifications.
Throughout the views similar parts are marked with like letters of reference.
According to this invention the eccentric or eccentric parts are formed in one

page_text: with the axle A carrying the hub 13 of the wheel and are located near the ends
thereof, the said eccentric parts being adapted to engage with recesses in the rear
end of the frame X.
In the construction illustrated by Figure 1 of the accompanying drawing the
ends a, a, of the axle A are eccentric with the central part thereof, and at the
junction of the said eccentric parts a, a, with the other part of the axle are formed
enlargements or collars a' a¹ which are concentric with the parts a, a, and eccen-
tric with the central part of the axle. These enlargements or collars a¹ a¹ engage
with recesses in the rear part X of the frame as shown.
are
In the construction shown by Figure 2 the enlargements or collars a', a',
dispensed with and the ends aa of the axle engage directly with the recesses a, a,
in the frame, the said ends being eccentric with the central part of the axle.
In the construction shown by Figure 3 the ends aa of the axle are made con-
centric with the central part thereof and eccentrically arranged enlargements or
collars a¹, a¹, are formed on the axle and engage with the recesses,, in the
frame.
The adjustment of the chain is effected by unlocking the nuts B1, B1, on the
ends of the axle and rotating the said axle in the recesses in the frame, to
which end one or both ends of the axle A are squared or otherwise shaped to
enable them to be operated by a spanner.
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 a cycle, forming both ends of the axle adapted to carry the hub of the
driving wheel eccentric with the central part thereof, as and for the purpose set
forth.
(2) In a cycle, forming at or near each end of the axle adapted to carry the
hub of the driving wheel, an eccentrically arranged enlargement or collar, the
said enlargements or collars being adapted to engage with recesses in the frame,
as and for the purpose set forth.
is 20th day of January 189
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.