Improvements in Driving Chains.
Year: 1893

page_text: Date of Application, 3rd Nov., 1893-Accepted, 9th Dec., 1893
Improvements in Driving Chains.
We, JAMES WARD MILLIGAN, Secretary of Perry and Company, Limited,
and WILLIAM BENJAMIN TEALE, Manager of the Cycle Department of the said
Company, all of 36, Lancaster Street, in the City of Birmingham, 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 has reference to driving chains of the kind which consist of
alternate connecting blocks and side links jointed together by cross pins and used
for bicycles and other velocipedes and in other machines and apparatus for
transmitting power and rotary motion. Prior to this invention driving chains of
this kind have been made with hardened sheet steel bushes fixed on the joint pins
to prevent wear various means having been adopted for preventing the said bushes
turning on the joint pins and for preventing the joint pins turning in the side links
to which they are fixed. Our invention consists in connecting the hardened sheet
steel bushes and joint pins to the side links in the manner which we will now
describe by referring to the accompanying drawing on which
Fig. 1 is a sectional elevation of a piece of driving chain constructed according
to this invention and Fig. 2 is a sectional plan of the same.
Fig. 3 shews two of the side links and one of the hardened sheet steel bushes
separately and
Fig. 4 shews a thin sheet steel blank for forming one of the said bushes.
The same letters of reference indicate the same parts in all the figures of the
drawing.
The side links are marked A. the connecting blocks B the joint pins C and the
hardened steel bushes D. In carrying out this invention we fix the hardened
sheet steel bushes D to the side links A by making each of the bushes D with a
small projection d¹ at each end as shewn which projections fit into corresponding
lateral notches a¹ made in the joint pin holes a² in the side plates A. Each of
these notches a' is made in that side of the joint pin hole a³ which is nearest to the
main portion of the link as shewn in Fig. 3 so as not to diminish the strength of
the eye, and the end projections d on the bush are as shewn made at about inidway
between the meeting sides d² of the sheet steel blank as shewn in Fig. 4 so that
when this blank is formed into the bush D the sides d will meet at that part of
the joint pin C where there is the least wear. The length of each of the end
projections d' is rather less than the thickness of the side link A so that when the
parts of the chain are fitted together and the soft round steel wire joint pins C are
inserted in the holes a³ and bushes D the act of rivetting the ends of the joint pins
will cause them to spread slightly into the recesses a' in the side links and
effectually prevent any possibility of the joint pin C turning round.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In driving chains of the kind herein referred to fixing the soft round steel wire
joint pins and hardened sheet steel bushes to the side links A by making each
bush D with a projection d' at each end as described engaging in a notch in the
corresponding side links A into which notches a' the joint pin C is spread by
[D17

page_text: the act of rivetting the pins all as hereinbefore set forth, and illustrated by
the accompanying drawing.
Dated this 2nd day of November 1893.
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.