Improvements in Cycle Cranks.
Year: 1892

page_text: Date of Application, 10th Oct., 1892
Complete Specification Left, 6th July, 1893-Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Cycle Cranks.
I FREDERIC GREENER of Edmund Street Birmingham in the County of
Warwick Cycle Manufacturer, do hereby declare the nature of my said invention
to be as follows:-
My invention has for its object improvements in cycle cranks by which such
cranks are made much stronger and at the same time much lighter than hitherto
and without increasing the cost of manufacture.
In carrying my invention into effect I form my crank of + section the ribs of
which are rounded on the surface and also the angles of the webs rounded so that
each groove forms a flute which is nicely curved off to the square face at the ends
to receive the chain wheel and treadle spindles. I may form my crank circular in
section and lighten it by grooving out three four or more flutes & I may forge or
cast it as may be required for the particular purpose. Such cranks are much
lighter and are considerably improved in appearance while the cost of manufacture
is not materially increased."
Dated this 8th day of October 1892.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.
COMPLETE SPECIFICATION.
Improvements in Cycle Cranks.
I FREDERIC GREENER of Edmund Street Birmingham in the County of
Warwick Cycle Manufacturer 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 :-
My invention has for its object improvements in cycle cranks by which such
cranks are made much stronger and at the same time much lighter than hitherto
and without increasing the cost of manufacture.
In carrying my invention into effect I form my crank of + section the ribs of
which are rounded on the surface and also the angles of the webs are rounded
so that each groove forms a flute which is nicely curved off to the square face at
the ends to receive the chain wheel and treadle spindles. I may form my crank
circular in section and lighten it by grooving out three, four or more flutes.
I may
forge or cast it as may be required for the particular purpose. Such cranks are
much lighter and are considerably improved in appearance while the cost of
manufacture is not materially increased.
In order that my invention may be clearly understood and more easily carried
into practise I have appended hereunto a double sized sheet of drawings upon
which an example of my crank is clearly shown. Of course I do not confine
myself to the exact configuration thereupon shown.
Figure 1 is a front view of the crank.
Figure 2 is a side view of the same crank.
Figure 3 is a cross section thereof.
Figure 4 is another cross section showing a modification in the shape.
I may roughly shape the crank either by forging or casting, or I may turn it out
of a solid bar in which case the ends a' and a' could be left round after which flutes
such as a' a' a' and a' may be formed therein any desired number of which may

page_text: Generally however I make the crank of + section such as seen at Figures 3
and 4 which are cross sections of the crank illustrated by Figures 1 and 2.
There are four hollows a' a' a' and a' and likewise four ribs a' a' a' and a³. The
tops of these ribs may be left with keen edges as shown by Figure 3 or with
rounded edges to the ribs as seen at Figure 4. I make these cranks from any
suitable metal or material.
Having now particularly described the nature of my said invention and in what
manner the same is to be performed I declare that what I claim is :-
--
I claim the improvements in cycle cranks substantially as hereinbefore described
and as illustrated upon the accompanying drawings.
Dated this 5th day of July 1893.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicant.