Improvements in Cycles.
Year: 1893

page_text: Date of Application, 1st Dec., 1893
Complete Specification Left, 16th Dec., 1893-Accepted, 27th Jan., 1894
Improvements in Cycles.
JOHN WILLIAM KENDRICK 25 Bromley Place Nottingham and THE
ROBIN HOOD CYCLE Co. LTD. Parliament Street Nottingham Cycle Manu-
facturers, do hereby declare the nature of this invention to be as follows:-
Our invention relates to improvements in changeable gearing applicable to
bicycles and certain kinds of tricycles.
Changeable gearing as at present constructed consists usually in making the
chain wheel rim detachable or. in forming the chain wheel and crank in one
piece.
Now the object of our invention is to make a changeable gear so that the same
crank and pedal may be used with different chain wheels, and in which the driving
power is transmitted through the chain wheel.
.
According to our invention the chain wheel is made separate from the crank and
can be fastened to the crank axle independently of the crank itself, which is made
without a boss and is attached to the chain wheel by making one end to fit a socket
on the chain wheel boss and forming lugs on the sides of the crank by which it is
fastened to the face of the chain wheel.
W. H. POTTER, Wh. Sc.,
Newcastle Chambers, Nottingham, Agent for the Applicants.
improvements in Cycles.
JOHN WILLIAM KENDRICK 25 Bromley Place Nottingham and THE
ROBIN HOOD CYCLE CO. LTD. Parliament Street Nottingham Cycle Manu-
facturers, 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 following statement :-
Our invention relates to improvements in changeable gearing applicable to
bicycles and to certain kinds of tricycles.
Changeable gearing as at present constructed consists usually in making the
chain wheel rim detachable, or in forming the chain wheel and crank in one
piece..
Now the object of our invention is to make a changeable gear so that the same
crank and pedal may be used with different chain wheels and in which the driving
power is transmitted through the chain wheel.
According to our invention the chain wheel is made separate from the crank, and
can be attached to the crank axle independently of the crank itself which is made
without a boss, and is attached to the chain wheel by making one end of it to fit a
socket on the chain wheel boss and forming lugs on the sides of the crank by which
it is fastened to the face of the wheel, and in order to reduce the width of the
tread of the machine, we fasten the axles of the pedals to the cranks by
recessed nuts.

page_text: Our invention is illustrated by the accompanying sheet of drawings, showing in
Fig. 1a front elevation of the chain wheel and crank, and in Fig. 2 a section of
the chain wheel with the crank in position.
The same parts in both figures are marked with the same reference letters.
The chain wheel a is, so far as the number of teeth band shape of the same,
similar to the wheels usually employed, but instead of the usual round boss, the
wheel used with our improvements has a socket formed on its boss, the shape of
which is shown at c d e f g, the section of the socket at the line ed corresponding
to the section of the crank at the same line. The chain wheel is fastened to the
crank axle by a screwed key which is passed through the hole h; or we may fasten
the wheel to the crank axle by any other means which allow of the wheel being
readily removed from the axle.
The crank is made with a pin or projecting piece which is fitted to a hole in
the socket on the chain wheel boss, and from both sides of the crank there are
projecting arms m which are fitted to the face of the wheel a and secured to the
rim or arms of the latter by screws n.
For reducing the width of the tread of the machine we form a screw thread in
the pedal axle hole p and after screwing the pedal axle into the same we lock it by
a recessed nut, fitting the recess y at the back of the crank. This nut is tightened
by a screwdriver having projecting pins or by similar means.
By means of our improvements the chain wheels can be readily changed the
same crank and pedal may be used with different wheels, and the chain wheels are
always concentric with the axle when placed thereon, without any adjustment.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. In changeable gearing for safety bicycles, the use of a chain wheel which can
be attached to the crank axle independently of the crank, and to which wheel the
crank is attached by side arms and by making the end of the same to fit a socket
en the wheel boss substantially as shown and described in the accompanying
drawings and Specification.
2. Changeable gearing for safety bicycles substantially as shown and described
in the accompanying drawings and Specification.
Dated this 15th day of December 1893.
W. H. POTTER, Wh. Sc.,
Newcastle Chambers, Nottingham, Agent for the Applicants.