Improvements in Bicycles, Tricycles, and other Velocipedes.
Year: 1893

page_text: Date of Application, 18th July, 1893
Complete Specification Left, 12th Apr., 1894-Accepted, 12th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in Bicycles, Tricycles, and other Velocipedes.
We, CHARLES VERNON PUGH, Managing Director of The Whitworth Cycle
Company Limited, Whitworth Works, Rea Street South, Birmingham, in the
County of Warwick, Velocipede Manufacturers, and JOHN VERNON PUGH, of
Whitworth Works, aforesaid, Mechanical Engineer, do hereby declare the nature
of this invention to be as follows:-
Our invention has reference to bicycles, tricycles, and other velocipedes driven
by chain gearing in which the chain wheel on the crank axle is composed of an
interchangeable chain ring fitted onto the ends of radial arms carried by the boss
of the crank arm or carried by a separate boss or collar keyed to the crank axle.
When the radial chain ring carrying arms are made in one piece with the crank
arm the said crank arm serves also as one of the radial arms of the chain ring.
Velocipedes to which this construction of crank is applied have the disadvantage
that dust excluding and oil containing covering cases commonly called gear cases,
for enclosing the chain wheels and chain cannot be fitted to them.
The other method before referred to, namely that in which the radial chain ring
carrying arms are carried by a separate boss or collar keyed to the crank axle,
permits of the application of the said gear case to the velocipede to which the said
separate boss or collar is fitted but the said method has the disadvantages that it
increases the number of parts and consequently the cost of manufacture of the
velocipede and also increases the weight of the same and is attended by the
liability of the chain wheel becoming loose.
The object of our invention is to construct the cranks and radial chain ring
carrying arms in one piece as hereinafter described whereby velocipedes to which
they are fitted are without the disadvantages and inconveniences pointed out with
reference to the ordinary methods of manufacture of the said parts.
In constructing the crank and radial chain ring carrying arms according to our
invention we make the boss on the inner face of the crank arm longer than usual
and we form the said radial arms for the chain ring on the end of the said boss the
part of the boss on the crank arm between the inner face of the said crank arm
and the radial chain ring carrying arms forming a neck or collar of a length
but little greater than the thickness of the side of the gear case hereinbefore
referred to.
In applying a gear case to a velocipede having the crank arm and radial chain
ring carrying arms constructed according to our invention the outer side of the two
halves of the said gear case passes between the said crank arm and the radial
chain ring carrying arms and one of the semi circular recesses in the meeting edge
of the outer side of each of the halves of the case embraces or fits onto the neck or
collar between the crank arm and radial chain ring carrying arms hereinbefore
described.
Crank arms and radial chain ring carrying arms made according to our invention
have great strength and are economical in manufacture.
Dated the 18th day of July 1893.
W. T. WHITEMAN,
Agent for the Applicants.

page_text: Improvements in Bicycles, Tricycles, and other Velocipedes.
We CHARLES VERNON PUGH, Managing Director of The Whitworth Cycle
Company Limited Whitworth Works, Rea Street South, Birmingham in the
County of Warwick Velocipede Manufacturers and JOHN VERNON PUGH, of
Whitworth Works aforesaid, Mechanical Engineer, do hereby declare the nature
of our 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 reference to bicycles tricycles and other velocipedes driven by
chain gearing in which the chain wheel on the crank axle is composed of an
interchangeable chain ring fitted onto the ends of radial arms carried by the boss
of the crank arm or carried by a separate boss or collar keyed to the crank axle.
When the radial chain ring carrying arms are made in one piece with the crank
arm the said crank arm serves also as one of the radial arms of the chain ring.
Velocipedes to which this construction of crank is applied have the disadvantage
that dust excluding and oil containing covering cases, commonly called gear cases,
for enclosing the chain wheels and chain cannot be fitted to them..
The other method before referred to namely that in which the radial chain ring
carrying arms are carried by a separate boss or collar keyed to the crank axle,
permits of the application of the said gear case to the velocipede to which the
said separate boss or collar is fitted, but the said method has the disadvantages
that it increases the number of parts and consequently the cost of manufacture of
the velocipede and also increases the weight of the same and is attended by the
liability of the chain wheel becoming loose.
The object of our invention is to construct the cranks and radial chain ring
carrying arms in one piece as hereinafter described whereby velocipedes to which
they are fitted are without the disadvantages and inconveniences pointed out with
reference to the ordinary methods of manufacture of the said parts.
In constructing the crank and radial chain ring carrying arms according to our
invention we make the boss on the inner face of the crank arm longer than usual
and we form the said radial arms for the chain ring on the end of the said boss
the part of the boss on the crank arm between the inner face of the said crank
arm and the radial chain ring carrying arms forming a neck or collar of a length
but little greater than the thickness of the side of the gear case hereinbefore
referred to.
In applying a gear case to a velocipede having the crank arm and radial chain
ring carrying arms constructed according to our invention, the outer side of the
two halves of the said gear case passes between the said crank arm and the radial
chain ring carrying arms and one of the semi-circular recesses in the meeting
edge of the outer side of each of the halves of the case embraces or fits onto
the neck or collar between the crank arm and radial chain ring carrying arms
hereinbefore described.
Figures 1 and 2 of the accompanying drawing represent respectively in side
elevation and vertical section a portion of a crank and chain wheel of a velocipede
containing our improvements:
Figures 3, 4 and 5 represent modifications of the method of connecting
the radial chain ring carrying arms to the web of the chain ring as hereinafter
described.
The same letters of reference indicate the same parts in the several figures of
the drawing.
a is the crank and b, b, b are the chain ring carrying arms made in one piece with
the said crank the boss of the said crank a being connected with the boss of the
radial chain ring carrying arms by the neck or collar c; d is a chain ring toothed

page_text: as usual connected to the radial arms 6 by the screw pins e, e as best seen in
Figure 2 the said screw pins taking into the radial projecting webs d' on the inner
face of the chain ring; f is the key or cotter by which the crank a and radial
chain ring carrying arms bare secured to the crank axle g of the velocipede.
We do not however limit ourselves to this method of fixing the crank to the
crank axle.
Instead of connecting the ends of the radial chain ring carrying arms 6 to the
webs d', d of the chain ring d in the manner represented in Figure 2, that is, by
forming circular. bosses on the ends of the said radial arms 6 for taking
into circular holes in the projecting webs d², the said projecting webs d' may
have bosses d³ taking into circular holes in the radial arms as represented in
Figure 3.
Or the projecting webs d² for the ring and radial arms may have coincident
holes of the same diameter, through which holes the connecting screw pins e pass
as represented in Figure 4.
Or the radial arms may have at their ends rebates in which the projecting webs d
of the chain ring d fit as represented in Figure 5.
Crank arms and radial chain ring carrying arms made according to our invention
have great strength, are economical in manufacture, require only one fixing key or
cotter for connecting them to the crank axle and have the further advantage that
dust excluding and oil containing cases commonly called gear cases may be applied
to velocipedes to which they are fitted.
Having now particularly described and ascertained the nature of our inven-
tion and the manner in which the same is to be performed we declare that
we claim as our invention of "Improvements in Bicycles Tricycles and other
Velocipedes";
Constructing combined crank arms and radial chain ring carrying arms of
bicycles, tricycles and other velocipedes with separating necks or collars between
the said crank arms and radial chain ring carrying arms substantially as and
for the purpose herein before described and illustrated in the accompanying
drawing.
Dated the Twelfth day of April 1894.
W. T. WHITEMAN,
Agent for the Applicants.