rovements in Chains for Driving Cycles and other such like purposes, and in the Manufacture of the same.
Year: 1891

page_text: Date of Application, 27th July, 1891-Accepted, 29th Aug., 1891
COMPLETE SPECIFICATION.
If rovements in Chains for Driving Cycles and other such like
purposes, and in the Manufacture of the same.
t
CHARLES HENRY BRAMPTON of the firm of F. W. Brampton & Co. of
142liver Street Nechells, Birmingham in the County of Warwick, Manufacturers,
do ereby declare the nature of my sail invention and in what manner the
sam is to be performed to be particularly described and ascertained in & by
the allowing statement :-
invention has for its object improvements in chains for driving cycles and
other such like purpose and in the manufacture of the same, which enables me to
produce a chain which combines maximum wearing qualities with great toughness
or endurance under concussive strains or shocks. Many attempts have been made
to accomplish these ends with more or less success but still there is a continual
tendency for surfaces which are constantly in wear to become loose unless they
are hardened and under the present mode of construction this is very difficult to
accomplish without making other portions of the chain hard which ought to be
tough and rather on the soft side. Now my invention is intended to meet this
difficulty.
In order that my invention may be clearly understood and more easily carried
into practical effect I have appended hereunto a double sized sheet of drawings
upon which I have illustrated three examples of my improved chains and the
manner in which they are manufactured as also an example of the state of the
art for some years before the date of this my present invention & this I do in
order that the exact nature of my present invention may be the more clearly
ascertained.
Figures 1., are a part sectional elevation and an elevation of my improved chain
shewing all the parts brought together as the chain is in practice when in a finished
condition.
Figures 2., are a front elevation and section of the inner links B.
Figures 3., are a sectional elevation and a plan of the boss C as shewn put
together by Figures 1.
Figure 4., is an alternative form of the boss C having a reduced part c².
Figure 5., is another alternative form of the boss C having an enlarged
collar c³.
Figures 6., are an elevation and section of the link B so brought together with
the boss C as to form practically one part being tightly united to each other.
Figure 7., shews within the circle a³ illustrates the present state of the art in
regard to the link A which up to now has been the equivalent of my link B and
boss C brought together as shewn by Figures 6.
Links hitherto made as shewn by Figure 7 have the bosses a solid with the
plate A the hole a² being drilled or made through the boss and plate. In practice
the part a² has to continually turn upon a pin which passes through and also a
roller similar to roller D Figure 1 turns upon the outer portion of the boss. It
is therefore very desirable that this boss both internally and externally should be
very hard and yet it is equally desirable that the link or shank part B should be
soft and tough at any rate certainly not hard or brittle. Practically this cannot
be done in a solid piece. Also where hardening is required the smaller the pieces
to be hardened are the less liability there is to twist or break under strain and
therefor small pieces may be extremely hardened without danger. I therefor
make my portion B Figures 2-which agrees with the old portion A Figure 7-of
soft steel or other metal and the boss portion C shewn by Figures 1, 3, 4, 5, & 6,
of either very hard steel or of steel hardened. I then take the portion C and

page_text: drive or force it into the hole b₁ of B under such pressure that it is pracy
immovable except tremendous force is used. In practice however when the in
is put together as shewn by Figures 1 there is no tendency for the part)
become loose from B except that caused by any friction around the pin
inside the friction roller D and this can never be much.
.0)
r
In manufacturing the chains the parts B and C are made separately, B
soft and tough and C hard and the two pressed or driven truly together as
by Figures 6. Two inner links B are then brought together inside the rollD
and upon the pin K when the outer links E are added and the pin K is compred
or rivetted into the said outer links E. The process is substantially the e
when bosses such as shewn by Figures 4 and 5 are used the parts c² of Fi
or of Figure 5 enter the holes ¹ in B in which are made smaller or large as
the case may be to receive them but in either case the same facility is given br
making the short boss C very hard as in such a length of boss there is practic y
no liability to twist and thus the pin K and friction roller D works quite truly and
fully thereon with an accurate fit.
5
4
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
claim is :-
The improvements in chains for driving cycles and other such like purposes and
in the manufacture of the same in which each of the portions C are manufactured
separately from the sides B so as to be of different temper the one to the other
substantially as and for the purpose herein set forth and as shewn upon the
drawings.
Dated this 25th day of July 1891.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicant.