Improvements in Driving Chains and Chain Gear for Motor Car and other purposes.
Year: 1898

page_text: Date of Application, 22nd Dec., 1898
Complete Specification Left, 17th Feb., 1899-Accepted, 1st Apr., 1899
PROVISIONAL SPECIFICATION.
Improvements in Driving Chains and Chain Gear for Motor Car and
other purposes.
We, CHARLES HENRY BRAMPTON, of Sutton Coldfield, in the County of Warwick,
Managing Director, and FREDERICK WILLIAM BRAMPTON, of Brockencote Hall,
Chaddesley Corbett, Kidderminster, in the County of Worcester, Justice of the
Peace, Gentleman, do hereby declare the nature of our said invention to be as
follows:
:-
Our invention has for its object improvements in driving chains and gear for
motor car and other purposes which are specially suitable for the transmission
of power from very large to very small sprocket wheels to avoid as much as possible
the necessity for intermediate motions and also for the purpose of minimizing the
risk of and adverse consequences from the breakage of a link or links of the chain
or of the teeth of the sprocket wheels.
Our driving chains and gear consist of sprocket wheels or pinions with two or
more rows of teeth formed side by side on the periphery of the wheels and of
two or more rows of link holes in the chains to gear over the said sprocket wheel
teeth and which are constructed of fine pitch in the following manner:-The
chain is made with two or more rows of holes from the shortest possible links so
as to make it capable of passing round and over the teeth of very small pinions,
and between each row a set of links are mounted which are of such extra strength
as may be required to bear their true proportion of the strain in transmitting
power, as otherwise the cross connecting pivot pin upon which the rollers are
mounted would be unduly strained between the outside links and then the
pin would be at a disadvantage having to carry the load as a girder supported only
at its two ends whereas our new chains are so designed as to transfer the strain to
the pivot pins as is done upon a girder laden with a distributed load, and this
allows us to make the chains any number of links wide without increasing or
materially increasing the diameter or strength of the pivot pins. The sprocket
wheels and pinions are made the necessary width to allow the two or more rows
of teeth to be cast or shaped thereupon which is done by forming first of all teeth
all across the rim and then slotting them with grooves cut circumferentially so
that the intermediate links will fall loosely into the said grooves thus forming an
extra guiding medium for the chain. It will thus be seen that in case a link or
other part broke that the chain would still be workable and the danger of break
downs would be reduced.
CHARLES HENRY BRAMPTON.
FREDERICK WILLIAM BRAMPTON.
By George Barker,
ow of The Chartered Institute of Patent Agents,
Agent for Applicants,
77, Colmore Row, Birmingham.

page_text: COMPLETE SPECIFICATION.
Improvements in Driving Chains and Chain Gear for Motor Car and
other purposes,
'
We, CHARLES HENRY BRAMPTON, of Sutton Coldfield, in the County of Warwick,
Managing Director, and FREDERICK WILLIAM BRAMPTON, of Brockencote Hall,
Chaddesley Corbett, Kidderminster, in the County of Worcester, Justice of the
Peace, Gentleman, do hereby declare the nature of our said invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
Our invention has for its object improvements in driving chains and gear for
motor car cycles and other purposes which are specially suitable for the transmission
of power from very large to very small sprocket wheels to avoid as much as possible
the necessity for intermediate motions and also for the purpose of minimizing the
risk of and adverse consequences from the breakage of a link or links of the chain
or of the teeth of the sprocket wheels.
Our driving chains and gear consist of sprocket wheels or pinions with two or
more rows of teeth formed side by side on the periphery of the wheels and of
two or more rows of link holes in the chains to gear over the said sprocket wheel
teeth and which are constructed of fine pitch in the following manner:- ―The
chain is made with two or more rows of holes from the shortest possible links so
as to make it capable of passing round and over the teeth of very small pinions,
and between each row a set of links is mounted which are of such extra strength
as may be required to bear their true proportion of the strain in transmitting
power, as otherwise the cross connecting pivot pin upon which the rollers are
mounted would be unduly strained between the outside links and then the
pin would be at a disadvantage having to carry the load as a girder supported only
at its two ends whereas our new chains are so designed as to transfer the strain to
the pivot pins as is done upon a girder laden with a distributed load, and this
allows us to make the chains any number of links wide without increasing or
materially increasing the diameter or strength of the pivot pins. The sprocket
wheels and pinions are made the necessary width to allow the two or more rows
of teeth to be cast or shaped thereupon which is done by forming first of all teeth
all across the rim and then slotting them with grooves cut circumferentially so
that the intermediate links will fall loosely into the said grooves thus forming an
extra guiding medium for the chain. It will thus be seen that in case a link or
other part broke that the chain would still be workable and the danger of break
downs would be reduced.
In order that our invention may be clearly understood and more easily carried
into practice we have appended hereunto drawings upon which we have shewn
three examples of our new chain and from which it will be easy for others to apply
the principle to wider or different sized driving chains for motor cars, cycles and
other purposes.
Figure 1 is a plan of a chain made to suit a sprocket wheel having two rows of
teeth such for instance as the sprocket pinion shewn at Figure 7.
Figure 2 is a plan of a chain made to suit a sprocket wheel having three rows of
teeth.
Figure 3 is a plan of a chain made to suit sprocket wheels with four rows of
teeth.
Figure 4 is a side elevation of the chain shewn by Figure 3.
Figures 5 & 6 are two views of a side plate of the well known kind having their
Ewo sleeves a¹ a¹ fastened therein in the usual manner upon which the rollers R
are mounted and upon which they revolve in the usual manner.

page_text: Figure 7 is a sprocket wheel pinion such as would be used for the chain shewn by
Figure 1.
Figure 8 is an enlarged part sectional plan of the chain shewn at Figure 1
when the particular construction in detail is shewn.
Our new driving chains whether made for two, three, four or more teeth in a
row on the face of the sprocket wheel are made up firstly of side plates such as A
having the usual sleeve pieces at a fast to them so that when brought together as
seen in section at Figure 8 form journals for the rollers R which turn freely upon
them in the usual manner. The outside links K of the chain are then connected
by means of the long pins or rivets E which pass entirely across the width of the
chain from outside to outside. Then the inner links K are threaded on to the
pins but these are thicker and stronger than the outside links K which is required
because they have to bear half the pull or strain which comes upon the rollers R
on both sides. In the case of Figure 2 there are two rows of thicker links K¹ and
in the case of Figure 3 there are three rows of the thicker or stronger links K¹.
Thus the rivets E serve to connect or couple up all the widths and parts together
the rivets being fast rivetted in and to the two outside links K. The sprocket
wheels and pinions S are constructed or shaped with a space 3 across the teeth so
as to sever them into two viz. s¹ and s² except the wheel was made in sections, for
the reception of the thick links K' in the case of a chain such as is shewn by
Figure 1, but in the case of a chain such as Figure 3 being used another space
such as §3 would be required and in the case of a chain like
Figure 3 still another
space $3 would be needed and SO
wider chains. We may form these spaces by making the sprocket wheels in
sections and bolting or otherwise fastening the sections together. It will be under-
stood that we do not confine ourselves to chains having rollers or of the exact shape
of the parts shewn our invention having particular reference to chains and sprocket
wheels having two or more sets of teeth and sets of links constructed substantially
as set forth.
oll for
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:-
CLAIMS.
First: The improvements in driving chains and gear for motor car and other
purposes consisting of the side links K and one or more intermediate links K¹
and side plates A the whole being coupled together with the rivets E so as to
work upon sprocket wheels such as S having intermediate spaces or gaps
substantially as and for the purpose herein set forth and shewn upon the drawings.
S:cond Driving chains for motor cars, cycles and the like manufactured with
a series of links such as K and K and side plates A in combination with each
other substantially as herein set forth and shewn by Figures 1, 2, 3, 4, 5, 6 and 8
upon the drawings.
Third: Sprocket wheels and pinions with grooves or gaps s³ so as to divide the
teeth into two or more rows and whether constructed solid or in sections sub-
stantially as herein set forth and shewn upon the drawings at Figure 7.
Dated this 27th day of Ion 1800
CHARLES HENRY BRAMPTON.
FREDERICK WILLIAM BRAMPTON.
By George Barker,
Fellow of The Chartered Institute of Patent Agents,
Agent for Applicants,
77, Colmore Row, Birmingham.