Year: 1899

page_text: I, WALTER PATRICK GRAFTON, of West View, Westcombe Hill, Blackheath, in
the County of Kent, Engineer, do hereby declare the nature of this invention to
be as follows:-
My invention has for its object to prevent a cyclist's skirt, or trousers, (as
the case may be) from catching on and becoming entangled with the boss or
eye of the pedal crank and cotter pin thereof, and also to prevent the heel
striking the boss in pedalling and so causing the foot to be displaced from the
pedal and scratching or injuring the plating of the boss.
With this object I provide a spoon-shaped shield or guard in the form of a
concavo-convex cap of considerably larger diameter than the crank boss which
as well as the cotter pin it encloses so as to present externally a convexly-rounded
surface from which the garment or heel will glide off. This guard or shield may
be made of metal, or of celluloid or other material, and may be secured in
position by various means. For instance it may be provided with cheek pieces
adapted to clip or embrace the crank arm near the boss and to be secured by
their own elasticity or by a cross-pin or screw passing behind the arm and
tightening the cheek pieces on the arm. Or the cap or shield might be secured
by a round headed screw screwing through it into a hole tapped centrally in the
crank axle, the mode of fixture being in any case such as to admit of the shield
being readily applied or dismounted as required.
1000
I, WALTER PATRICK GRAFTON, of West View, Westcombe Hill, Blackheath, in
the County of Kent, Engineer, 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 to prevent a cyclist's skirt, or trousers, (as
the case may be) from catching on and becoming entangled with the boss or
eye of the pedal crank and cotter pin thereof, and also to prevent the heel
striking the boss in pedalling and so causing the foot to be displaced from the
pedal and scratching or injuring the plating of the boss.
Reference is to be had to the accompanying drawings forming part of this

page_text: specification wherein Figure 1 is a perspective view of the shield applied to a
crank in its most simple form. Figure 2 is an outside face view, Figure 3 a
plan and Figure 4 an inside face view of a slightly modified form of shield shewn
attached to a bicycle crank. Figures 5 and 6 are edge views of the shield
attached to a crank, whilst Figure 7 is a similar view of a shield having a modified
means of attachment to the cycle crank.
Referring to the accompanying drawings A is a spoon-shaped shield or guard
in the form of a concavo-convex cap of considerably larger diameter than the
crank boss B which as well as the cotter pin C it encloses, so as to present
externally a convexly-rounded surface from which the garment or heel of the
cyclist will glide off as shewn in dotted lines, Figure 5. This guard or shield
may be made of metal, or of celluloid or other material, and may be secured in
position by various means. For instance it may be provided with cheek pieces a
adapted to clip or embrace the crank arm b near the boss B and to be secured
by a screw a passing through the cheek pieces a and behind the crank arm b
by means of which the cheeks a are tightened against the crank arm b as more
clearly shewn in Figures 3, 4 and 6. The cheeks a by their flexibility may be
closed in by the screw a sufficiently to enable them to grip crank arms of various
widths within certain limits.
The cheeks a may be adapted to spring over the crank arm 6 and engage the
latter by their inturned nibs a² as shewn in Figure 7.
In Figure 1 the shield is shewn as being fixed in place by a screw d passing
through it and screwing into a tapped hole in the end of the crank shaft. In
Figure 5 is shewn the manner in which a cyclist's heel would be deflected by
the shield and so prevented from being lifted off the pedal; this would occur if
any rectangular projection such as an ordinary cycle crank boss lay in the path
of the cyclist's heel.
A shield in the form of a flat cone would effect the same object but with less
advantage.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A shield or covering for the bosses of cycle cranks consisting of a shell of
rounded, oblate-spheroidal or flat conical form adapted to be fixed in place over
the boss of a cycle crank.
2. A shield or covering for the bosses of cycle cranks consisting of a shell of
rounded or flat conical form having lugs a adapted to be tightened against the
crank arm, substantially as and for the purpose specified.
3. A shield or covering for the bosses of cycle cranks consisting of a shell of
rounded or flat conical form having spring lugs a provided with nibs a² as and
for the purpose specified.
Dated this 13th day of Navambor 1800.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.