Improvements in Driving Chains.
Year: 1897

page_text: Date of Application, 19th May, 1897
Complete Specification Left, 19th Feb., 1898-Accepted, 19th Mar., 1898
Certain Improvements in Driving Chains.
We, JAMES WARD MILLIGAN, of 36, Lancaster Street, in the City of Birmingham,
Director and Secretary of Perry and Company Limited, and FRED ÜLDFIELD,
of 36, Lancaster Street, aforesaid, Works Manager of the said Company, do hereby
declare the nature of this invention to be as follows:-
This invention has reference to driving chains for use with sprocket wheels for
transmitting power and rotary motion in bicycles and other velocipedes motor
carriages and other machines and apparatus and this invention consists in making
the said driving chains as herein described whereby easy running is assured and
the chains will last a long time in wear.
At the present time what are known as block chains are commonly used the said
chains consisting of steel blocks and pairs of side plates arranged alternately and
jointed together by cross rivets on which the blocks turn. Each block has two of
the joint rivets passing through it and fits between two teeth of the sprocket wheel.
Instead of making the said blocks solid as heretofore we make each of the blocks
of two side plates and two circular collars of hardened steel or other metal which fit
between and engage with the two side plates and are concentric with the two rivets
passing therethrough. These hardened steel or other metal collars engage with the
side plates and are prevented from turning between the same by each of the collars
having a semi-circular or other projecting part at each end which engage in corre-
sponding recesses in the two side plates of the block. The teeth of the sprocket
wheels are made of such a pitch as to engage with all the collars of the chain thus
there are always two teeth engaging with each of the said blocks. It will be seen
that by making the driving chains as above described they may be of any pitch and
as small as the smallest pitch roller chain and used with the same kind of sprocket
wheel, but as the collars of the blocks of our chain do not revolve they will last
much longer in wear than do the rollers in a roller chain.
1
C
1007
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.
Certain Improvements in Driving Chains.
We, JAMES WARD MILLIGAN, of 36, Lancaster Street, in the City of Birmingham,
Director and Secretary of Perry and Company Limited, and FRED OLDFIELD,
of 36, Lancaster Street, aforesaid, Works Manager of the said Company, do hereby
Price 8d.1

page_text: declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement: ―
This invention has reference to driving chains for use with sprocket wheels for
transmitting power and rotary motion in bicycles and other velocipedes motor
carriages and other machines and apparatus and this invention consists in making
the said driving chains as herein described whereby easy running is assured and
the chains will last a long time in wear.
We will describe this invention by referring to the accompanying drawing on
which Fig.
is a plan partly in section of a piece of driving chain constructed in
accordance with this invention; Fig. 2 is a side view of the same partly in section;
Fig. 3 is a plan and Fig. 4 is a side view of one of the compound blocks of our
improved driving chain; Fig. 5 is a sectional plan of the said compound block;
Fig. G shews one of the side plates of the said block separately; Fig. 7 is a plan
and end view of one of the steel collars of the said block; Fig. 8 is a separate view
of one of the side plates which connect the compound blocks together; and Fig. 9
is a separate view of one of the hardened pen steel bushes which fit on the rivets
of the said driving chain.
The same letters of reference indicate the same parts in all the figures.
At the present time what are known as block chains are commonly used the said
chains consisting of steel blocks and pairs of side plates arranged alternately and
jointed together by cross rivets on which the blocks turn. Each block has two of
the joint rivets passing through it and fits between two teeth of the sprocket
wheel.
Instead of making each of the said blocks as a simple solid piece as heretofore we
make the blocks compound, that is to say, each block consists of two side plates
which are marked respectively A¹A2 and two circular collars marked respec-
tively B1 B2 of hardened steel or other metal which fit between and engage with
the two side plates A1 A2 and are concentric with the two rivet holes a¹ a² of the two
rivets CC which pass therethrough. These hardened steel or other metal
collars BB2 engage with the side plates A¹A² and are prevented from turning
between the same by each of the collars BB having a semi-circular or other
projecting part at each end marked 61 62 which engage in corresponding recesses a³ at
formed in the two side plates A1 A2 of the block. One of the said compound blocks
thus made is shewn separately from the chain by Figs. 3, 4 and 5. In making up
the chain our compound blocks are used in any of the ways in which the ordinary
solid blocks are used, that is to say, our compound blocks are connected together
by cross rivets C and pairs of side plates D1 D2 which are of the same pitch as the
holes a¹a in the compound blocks. Fitting round each of the rivets C (which in
this case are soft) we prefer to use a hardened pen steel bush E shewn separately
by Figure 9 which, as in the chain described in the Specification of James Ward
Milligan and William Benjamin Teale's Letters Patent No. 20845 of A.D. 1893,
has end projections which engage in recesses f¹ in the rivet holes f of the side
plates Di D³ to prevent the bush E from turning on the rivet.
The teeth of the sprocket wheels are made of such a pitch as to engage with all
the collars B1 B2 of the chain thus there are always two teeth engaging with each
of the said compound blocks.
It will be seen that by making the driving chains as above described they may
be of any pitch and as small as the smallest pitch roller chain and used with the
same kind of sprocket wheel, but as the collars B₁ 132 of the blocks of our chain do
not revolve they will last much longer in wear than do the rollers in a roller chain.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is: -
1. In driving chains of the kind herein referred to, making each of the blocks

page_text: of two side plates and two circular collars said collars being concentric with the
joint pins and fitted between and so engaging with the side plates as not to turn
independently of them, substantially as set forth.
2. In driving chains of the kind herein referred to the employment of blocks
each composed of two side plates A1 A2 and two circular collars B 12 said collars
being concentric with the joint pins and fitted between the side plates and made
with end projections 6163 engaging in corresponding recesses a³ as in the side plates
su as not to turn independently of them, substantially as set forth.
3. The improved driving chain having each of its blocks formed of the two side
plates A¹ A² and the two circular collars B¹ 132 fitting between said side plates and
made with end projections b' 62 engaging in recesses a of the said side plates in
combination with pairs of outside side plates D1 D2 connected to the blocks by
rivets C said rivets being enclosed by hardened steel bushes E made with end pro-
jections el taking into recesses f¹ in the outside plates D¹ D², the whole forming
a driving chain substantially as herein before described and illustrated by Figs. 1
and 2 of the accompanying drawings.
101
1000
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.