Improvements in or relating to the Frames and Driving Mechanism of Cycles, Motor Cars, and the like.
Year: 1898

page_text: Date of Application, 17th Nov., 1898
Complete Specification Left, 18th Sept., 1899-Accepted, 21st Oct.,
1899
Improvements in or relating to the Frames and Driving Mechanism
of Cycles, Motor Cars, and the like.
WC, NORTON ARTHUR SAWYER, STANLEY GEORGE SAWYER, and WILLIAM
SAWYER, Engineers, all of High Street, Wrentham, in the County of Suffolk, do
hereby declare the nature of this invention to be as follows:-
This invention relates to cycles, motor cars and the like and has particular
reference to the construction of the frame whereby the large chain driving wheels
now frequently used can be employed without the draw-backs existing in the
present constructions. As at present made when a large gear wheel is employed
the frame is so arranged that the wheel base is greatly lengthened and the back
forks and particularly the chain stays are much weakened by this extra length.
Hitherto it has not been found possible to avoid these drawbacks without the
employment of an excessively wide tread; by our invention however we obtain
the desired results without the drawbacks.
In carrying out the invention we arrange the parts so that the chain wheel
overlaps the rim and tyre of the road wheel to any desired extent and we effect
this without increasing the width of the tread by cranking the chain stay at a
distance from the bottom bracket sufficient to leave the required space
for the chain wheel. The chain stay may be cranked again near the
bottom bracket in the usual manner SO as to bring it into the proper
position. That portion of the chain stay, which lies near the chain wheel we
prefer to flatten so as to economise space. or if preferred two or more tubes of
smaller diameter may be employed vertically above each other.
In a modified form the chain stay may extend straight from the bottom
bracket to the distance required by the size of the chain wheel and may then be
cranked, the arrangement providing sufficient space near the bottom bracket for
the accommodation of the road wheel of the vehicle.
In all the above arrangements the rim and tyre of the road wheel are received
between the forks near the bottom bracket and overlapping the chain wheel
so that the abnormally long wheel base required with the ordinary construction
is by our invention avoided.
The chain stay upon the side remote from the chain wheel may be cranked
or dealt with similarly to what has been described in relation to the other chain
stay.
The chain stay on the chain wheel side may be cranked again to accommodate
the chain wheel upon the hub of the road wheel, or if preferred the chain stay
may be carried out straight from its proper position at the road wheel hub, the
single crank near the periphery of the driving chain wheel serving to provide the
necessary room at the road wheel hub. This is particularly useful where it is
desired to use a large chain wheel upon the road wheel hub.
1000
BOULT & WADE,
Agents for the Applicants.

page_text: Improvements in or relating to the Frames and Driving Mechanism
of Cycles, Motor Cars, and the like.
We, NORTON ARTHUR SAWYER, STANLEY GEORGE SAWYER, and WILLIAM
SAWYER, Engineers, all of High Street, Wrentham, in the County of Suffolk, 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 fol-
lowing statement:
>
-
This invention relates to cycles, motor cars and the like and has particular
reference to the construction of the frame whereby the large chain driving wheels
now frequently used can be employed..without: the draw-backs -existing in the
present constructions. As at present made when a large gear wheel is employed
the frame is so arranged, that the wheel base is greatly lengthened and the back
forks and particularly the chain stays are much weakened by this extra length.
Hitherto it has not been found possible to avoid these without the
employment of an excessively wide tread; by our invention however we obtain
the desired results without the drawbacks.
1.
In carrying out the invention we arrange the parts so that the chain wheel
overlaps the rim, and tyre of the road wheel to any desired extent and we effect
this without increasing the width of the tread by cranking the chain stay at a
distance from the bottom bracket sufficient to leave the required space
for the chain wheel. The chain stay may be cranked again, near, the
bottom bracket in the usual manner So' as
to bring it into the proper
position. That portion of the chain stay, which, lies near the chain, wheel we
prefer to flatten so as to economise space, or if preferred two or more tubes of
smaller diameter may be employed vertically above each other.
'
In a modified form the chain stay may extend straight. from the bottom
bracket to the distance required by the size of the chain wheel and may then be
cranked, the arrangement providing sufficient space near the bottom bracket for
the accommodation of the road wheel of the vehicle.
"
In all the above arrangements the rim and tyre of the road wheel are received
between the forks near the bottom bracket and, overlapping the chain wheel
so that the abnormally long wheel base required with the ordinary construction
is by our invention avoided.
.
to tr
The chain stay upon the side remote from the chain, wheel may be cranked
or dealt with similarly to what has been described in relation to the other chain
stavi
The chain stay on the chain wheel side may be cranked again to accommodate
the chain wheel upon the hub of the road wheel, or if preferred the chain stay
may be carried out straight from its proper position at the road wheel hub,,.the
single crank near the periphery of the driving chain wheel serving to provide the
necessary room at the road wheel hub.
desired to use a large chain wheel upon the road wheel hub.
This is particularly useful where it is
The accompanying drawing is a plan of the back fork of a cycle showing the
improved chain stay.
·
Like letters indicate like parts throughout the drawing.
The improved stay A is formed of a tube, one end of which is inserted in the
bottom bracket lug B near this lug the tube A is preferably bent or cranked as
at A¹ and somewhat flattened. The tube is again cranked at another point A2,
the distance of this point from the bottom bracket depending on the diameter of
the chain wheel C. The portion of the chain stay between the cranked parts A!
and A lies approximately parallel to the plane of the chain wheel,

page_text: It will be seen that by forming the chain stay in the above described manner
sufficient clearance is allowed for the wheel D, while ample room is left for the
chain. wheel C, which is so large as to overlap the wheel D, without increasing
the tread of the machine.
If desired instead of bending the tube at the points A¹ and A2 the cranking
may be effected by the use of lugs.
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 a cycle, motor vehicle or the like the employment of a chain stay cranked
as at A2 or as at A' and A³ whereby a chain wheel so large that it overlaps the
road wheel of the vehicle may be used without increasing the width of the tread
of the machine substantially as described.
2. A cranked chain stay such as A. for a cycle, motor vehicle or the like sub-
stantially as and for the purpose described or illustrated in the accompanying
drawing.
Dated this 18th day of September 1899
BOULT & WADE,
Agents for the Applicants.