Improvements in Chain Wheels for Cycles and other purposes.
Year: 1896

page_text: Date of Application, 11th Jan., 1896
Complete Specification Left, 8th Sept., 1896-Accepted, 14th Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in Chain Wheels for Cycles and other purposes.
I, JOHN BLACKMORE of 91, Mortimer Road, Kensal Rise, London, W.
Cabinet Maker, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved construction of chain wheel for use with
cycles and for other purposes, and has for its object to provide an arrangement by
means of which the friction will be reduced and the wheels be rendered stronger.
In carrying out my invention I secure the wheel on the crank spindle in the
usual manner, but form it with a flange or rim projecting towards the inner side so
as to make it of a shallow cup shape.
On the flange the teeth are formed in the usual manner, the inner portion of the
wheel projecting slightly to the outside of the teeth. The inside of the flange is
formed of a ball race, and the bearing consists of a flange or disc secured on the
end of the crank tube. This disc is formed with a ball race at its periphery, so that
when the two parts come together, a channel is formed within which the balls are
placed. A considerable number of balls is thus employed, and owing to the
position in which they are placed, the strain on the bearing is greatly reduced,
and the friction consequently lessened. At the same time there is less danger of
the parts getting out of order.
As applied to cycles, the crank tube is made quite plain, the spindle passing
through it without touching any point.
Dated this 11th day of January 1896.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Chain Wheels for Cycles and other purposes.
I, JOHN BLACKMORE of 91, Mortimer Road, Kensal Rise, London, W.
Cabinet Maker, do hereby declare the nature of my said 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 relates to an improved construction of chain wheel, for use with
cycles and for other purposes, and has for its object to provide an arrangement by
means of which the friction will be reduced and the said wheel increased in
strength.
For this purpose I secure the chain wheel to the crank spindle in any ordinary
manner, and form it with a flange or rim projecting towards the inner side so as to
make it of a shallow cup shape.
On this flange the teeth are formed, its inner edge projecting slightly beyond
the inner sides of the teeth.
The inside of the flange is formed or provided with a ball race, and the bearing
consists of a flange or disc secured to the end of the crank tube. This disc is
formed with a ball race at its periphery so that when it is fitted in position within
حديد

page_text: the wheel flange a channel is formed within which the anti-friction balls are
placed. A considerable number of balls can thus be employed, and owing to the
position which they occupy, the strain on the bearing is greatly reduced, and
the friction consequently lessened, whilst at the same time there is less liability
for the parts to get out of order.
In the accompanying sheet of drawings illustrating my invention Fig. 1 is a
vertical cross section of my improved chain wheel and parts connected therewith,
and Fig. 2 is an inside face view of the same.
a is the chain wheel formed with the inner flange or rim a¹ having the teeth a²
on its outer periphery. This flange is formed or provided with the ball race b
whose outer half may consist of a disc or ring e fixed to the flange but capable of
removal in order to place the balls in position.
-The bearing portion or other half of the race is formed on the periphery of the
-disc or flanged secured by means of screws or otherwise, to the end.of the crank
tube e. In the case of cycles this tube is made quite plain at the wheel end the
crank spindle f passing through it without coming into contact with it at any point
on that.side.
As will be seen the anti-friction ball race bis thus formed of such a circum-
ferential length as to permit of a considerable number of balls being placed
therein, and owing to the position of the latter near the circumference of the wheel
the strain on the bearing is greatly reduced and friction consequently lessened.
The disc d also forms a firm support to the chain-wheel thus increasing its
strength and reducing to a minimum the liability of the parts getting out of
order.
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 I
claim is :-
1. In chain-wheels for cycles and other purposes providing the same with an
inner flange or rim at or near their peripheries the said flange or rim being formed
with a ball race the other or bearing half of which is formed on the periphery of a
disc or flange secured to the end of the crank tube substantially as described and
for the purposes specified.
2. In the construction of chain-wheels the combination with the wheel body a of
the flange or rim a', teeth a², ball race b, dise or ring c, disc or flange d, crank
tube e and spindle f, substantially as described and for the purpose specified.
3. The improved chain-wheel for cycles and other purposes, substantially as
described and shown in the drawings.
Dated this 5th day of September 1896.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.