A New Guard for Preventing the Pedal Nut and Crank of a Velocipede from Catching the Chain.
Year: 1892

page_text: Date of Application, 23rd Dec., 1892-Accepted, 25th Feb., 1893
COMPLETE SPECIFICATION.
A New Guard for Preventing the Pedal Nut and Crank of a
Velocipede from Catching the Chain.
CHARLES THOMAS AUSTEN 2 Craythorn Street, Lewisham, in the County of
Kent, Cycle 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 consists of a guard, and in placing the same in such a position
whereby it shields the nut which bolts the pedal on to the crank of a velocipede.
The pedal nut generally runs close to the chain, and when in motion, the chain is
liable to sway and catch the nut & crank as it passes the chain thereby causing
accidents. My object in shielding the nut is that the chain, when it sways, strikes
the guard, and glides off, and thus clears the nut and crank. In order that my
invention and the manner in which I attach it to the crank or form it therewith
during the process of manufacture, may be clearly understood, I have appended
the accompanying sheet of drawings.
Fig. 1. is a plan of crank shewing pedal pin, nut, and my new guard. The
line A represents the outer edge of the chain. The dotted line B represents the
position in which the chain would take to foul the pedal nut or the crank.
Fig. 2 is a section through the line C-C Fig. 1.
Fig. 3 is a similar section, but shewing the guard formed on the crank.
Fig. 4 is a similar section, but shewing the form in which I bend the guard
when the pedal pin is rivetted into the crank, and the pedal nut dispensed with.
Fig. 5 is a side view of my guard.
Fig. 6 is a view of my guard in perspective.
Referring to Fig. 1. D represents the ordinary crank used on velocipedes, with
the pedal pin E, attached to the crank by the pedal nut F, neither of which
however, form part of my present invention; the guard G is bolted on as herein
fully described.
In carrying my invention into effect, I provide a metal washer, and form thereon
a tail or strip of metal of suitable length and breadth, see Fig. 5 and 6, and when
bent in a suitable form, as hereinafter described, forms the guard; it may be
formed of iron, steel, or other suitable metal.
To fasten the guard in the desired position to prevent the nut or crank from
fouling the chain; the guard is placed over the end of the pedal pin, and is
held in position by the screwing up of the pedal nut.
To form the guard as herein before mentioned, the tail is bent as shewn in
Fig. 5 & 6, and at a suitable length and angle, whereby the chain, when it glides
off the guard clears the nut; or I may adopt any modification of this shape which
will best answer the purpose.
I may also form the guard on the crank, Fig. 3, during the process of manu-
facture, in a suitable position and bent into the desired form, whereby it acts as
a guard to prevent the pedal nut from fouling the chain.
In some cases it is found advisable to dispense with the pedal nut, and fix the
pedal pin into the crank by rivetting, as shewn in Fig. 4. In that case I form
the guard on the crank, or attach it to the same by suitable means.
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:
1. A new guard or shield, Fig. 5 and 6, for the pedal nut and crank of a
zolacinade the use and anulination of a matallia washer with on attachment Ar

page_text: tail, formed thereon substantially as and for the purpose herein described and
shewn by the accompanying drawings.
guard or shield for the pedal nut and crank of a velocipede, the
use and application of a tail or strip of metal formed on the crank, and bent in
the desired form as Fig. 3, substantially as herein described and shewn.
2. A new.
Dated this 23rd day of December 1892.
CHARLES THOMAS AUSTEN.