Improvement in or relating to Cranks and Chain Wheels for Cycles.
Year: 1894

page_text: Date of Application, 29th Jan., 1894
Complete Specification Left, 27th Oct.. 1894-Accepted, 1st Dec.. 1894
PROVISIONAL SPECIFICATION.
Improvement in or relating to Cranks and Chain Wheels
for Cycles.
FRANCIS CHARLES SOUTHARD, 16 Derby Road Southampton in the Town and
County of Southampton Cycle Works Manager, do hereby declare the nature of
this invention to be as follows:-
My invention has for its object improvement in that part of cycles known as the
crank and chain & sprocket wheels, by which means I connect the crank to the
chain & sprocket wheel in a manner which enables me to make a much stronger and
lighter crank and chain or sprocket wheel combined, without increased cost of
manufacture.
In carrying my invention into effect I form two or more grooves, some of which
grooves are undercut or dovetailed. Such grooves are formed on the end of the
crank which connects to the crank axle, known as the boss of crank and on the
inside of same so as to connect with corresponding grooves, which I cut in centre or
boss of chain wheel.
The connection is formed by sliding one into the other, after which, both can be
fastened to axle by cottering the crank only, as the chain wheel cannot become
detached without taking both off the axle.
Dated this 27th day of January 1894.
FRANCIS CHARLES SOUTHARD.
COMPLETE SPECIFICATION.
Improvement in or relating to Cranks and Chain Wheels
for Cycles. :
I, FRANCIS CHarles SouthARD, of 16, Derby Road, Southampton, in the
Town and County of Southampton, Cycle Works Manager, 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 :-
My invention has for its object improvements in the parts of cycles known as the
crank, and chain and sprocket wheels, by means of which I connect the crank to
the chain or sprocket wheel in a manner which enables me to make a much stronger
and lighter crank, and chain, or sprocket wheel combined, without increased cost of
manufacture.
In the accompanying drawings I have shewn how I consider my invention may
be best carried out, in which
Fig. 1. is an outside elevation of a chain wheel shewing a crank fitted on same.
according to my invention.
Fig. 2, a plan on top of Fig. 1.
Fig. 3, an outside elevation of a chain wheel, shewing the method in which
I groove and form the boss so as to take the boss of crank."
Fig. 4, is a plan on top of Fig. 3.
Fig. 5, a plan on top of crank, in the position as shewn at Fig. 1; but separated
from the chain wheel.
Fig. 6. is an inside elevation-taken on the line a, a,-of the boss end of
crank, shewing the method in which 1 groove the boss.
Like letters indicate corresponding parts throughout the drawings.
TD 071

page_text: In carrying out my invention, according to one form or modification of same, a
parallel slot or groove b, with square sides, is cut out of the centre of wheel boss,
and two projections c, c, are formed on the boss, undercut, or dovetailed, and
tapering at the outer edges or sides.
In the boss of crank I cut two slots d, d, corresponding in form and size to the
projections c, c, on the boss of wheel, leaving a projection e, corresponding in form
and size to the groove b, in wheel boss.
When it is desired to connect the crank to the wheel the former is passed on at
the top part f, of the boss of wheel and driven down on same, and thus the crank
and wheel are firmly connected together, and if preferred may be brazed in the
properly fitted position, the wheel and crank thus becoming practically one fitting,
the projection e, tightly fitting in the groove b, and the projections c, c, in the
grooves d, d.
It is obvious that the undercut form of the grooves d, d, prevents the crank,
when once fitted in place on the wheel, from coming off same sideways, and that the
chain wheel and crank can be attached to, and detached from the crauk axle
simultaneously as one fitting.
In carrying out my invention I do not confine myself to the exact form and
number of projections and grooves in the wheel and crank bosses, as illustrated in
the accompanying drawings, but I may somewhat vary the form, and provide any
suitable number of projections and grooves on, and in the crank and chain wheel
bosses respectively-and of any suitable form to secure the object in view-without
departing from the nature of my said invention.
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 :-
1st. My improvements relating to cranks, and chain wheels for cycles, consisting
of the parts constructed and arranged, substantially as hereinbefore described with
reference to the accompanying drawings.
2nd. In a cycle the combination in, and between the crank and chain wheel
adapted to serve together in manner substantially as herein before described with
reference to the accompanying drawings.
3rd. In a cycle the attachment of the cranks to the chain wheel by means of
projections c, c, and e, and grooves b, and d, d, or similar thereto, formed respectively
upon and in the boss of chain wheel and crank, substantially as hereinbefore
described with reference to the accompanying drawings.
4th. For a cycle the improved crank and chain wheel combined in manner
substantially as hereinbefore described with reference to the accompanying
drawings.
Dated this 26th day of October 1894.