An Improved Method of Attaching Pedal Studs to Crank Arms in Bicycles or other Pedomotors.
Year: 1897

page_text: PROVISIONAL
SPECIFICATION.
An Improved Method of Attaching Pedal Studs to Crank Arms in
Bicycles or other Pedomotors.
as
WILLIAM JAMES HAMILTON, of Church View Cottage, Tanderagee, Co. Armagh,
Ireland, Mechanic, do hereby declare the nature of this invention to be
follows:-
This improved method of attaching the pedal stud to the crank arm in pedomotors
is designed to give perfect stability when fixed and yet affording ready means of
detaching the stud when desired and consists essentially of an elastic locking lever
which is attached to a polygonal shoulder under the collar of the pedal stud. When the
pedal stud is screwed home into the arm of the crank the projecting arm of the
elastic locking lever slips into a recess formed in the face of the crank arın and so
effectually prevents the pedal stud from turning round or coming unscrewed whilst
when it is required to detach the pedal stud from the crank arm it is only necessary
to lift or spring out the elastic locking lever from the recess in the crank arm and
then the locking lever and stud can be turned round or unscrewed and so be removed
when desired.
Dated this 2nd day of November 1897.
An Improved Method of Attaching Pedal Studs to Crank Arms in
Bicycles or other Pedomotors.
I, WILLIAM JAMES HAMILTON, of Church View Cottage, Tanderagee, in the County
of Armagh, in Ireland, Mechanic, 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 relates to means of attaching the pedal stud to the crank arm in
bicycles and other pedomotors and of giving perfect stability to such attachment
when fixed while admitting of the ready detachment of the stud when desired, and
it consists essentially of an elastic locking lever which is firmly attached to or formed
upon the collar of the pedal stud.
This elastic locking lever is furnished with a projecting arm the end of which slips
or falls into a recess formed in the face of the crank arm, thereby engaging with it
and effectually preventing the pedal stud from turning round and becoming loose or
unscrewed. And I may provide an additional recess or additional recesses at the
same radial distance, from the centre of the pedal stud to̟ enable the elastic locking
lever to be tightened on the stud or adjusted on the crank arm.

page_text: For the purpose of fixing the elastic locking lever upon the pedal stud I form a
polygonal shoulder upon the stud below its collar and fit the lever to such shoulder.
But in working out my invention I have found that a simpler mode of fixing the
elastic locking lever and pedal stud together, and dispensing with the formation of a
polygonal shoulder upon the latter is to make a circular hole in the lever through
which the screw of the pedal stud may pass, providing the rim round such hole with
a steady pin and the collar of the pedal stud with a steady pin hole to receive such
pin and I prefer the latter arrangement.
In the former arrangement the elastic locking lever may be shifted round the
shoulder from time to time when it becomes slack by reason of the sides of the
shoulder used being worn or itself becoming strained in any way. And in the latter
arrangement there may be several steady pin holes formed in the collar of the pedal
stud to enable the elastic locking lever to be adjusted if necessary at any time or a
new steady pin may be supplied.
In each of the arrangements I have described when it is required to detach the
pedal stud from the crank arm all that is needed will be to lift or spring the elastic
locking lever out from the recess in the crank arm and the locking lever and stud
can then be together turned round or unscrewed and so be removed.
I may also peg or braze the elastic locking lever and pedal stud rigidly together
or strengthen their attachment in the manner previously described by brazing.
Another arrangement of my invention would be to form the elastic locking lever
upon and as part of the pedal stud.
I may also, if necessary, pass a set screw through the free end of the projecting
arm into the recess in the face of the crank arm for adjusting and holding the elastic
locking lever and preventing it from slipping out of the recess.
And in order that my said invention may be more fully understood I shall proceed
to refer to the drawings on the sheet hereunto annexed the same letters of reference
being employed to indicate the same or corresponding parts thereof throughout all
the figures.
Fig. I is a plan of an elastic locking lever arranged to fit firmly upon a polygonal
shoulder formed under the collar of the pedal stud and furnished with a projecting
arm, the end of which will slip or fall into a recess on the face of the crank arm.
Fig. II is a longitudinal side view of an elastic locking lever.
Fig. III is a plan of a simpler elastic locking lever arranged with a steady pin on
its rim to engage a contiguous steady pin hole in the collar of the pedal stud and
also with a set screw at the end of the projecting arm and passing through it into the
recess in the face of the crank arm.
Fig. IV is an end view of the pedal stud showing steady pin holes to receive the
steady pin on the contiguous face of the elastic locking lever.
Fig. V is a front view of the crank arm with a recess formed in its face, the elastic
locking lever when out of operative position and the pedal stud to the collar of which
such lever is firmly attached, and
Fig. VI is a
longitudinal cross section of the pedal stud end of the crank arm
showing the recess in its face.
a is the elastic locking lever with its projecting arm, b, and c is the hole in a
fitting upon the polygonal shoulder under the collar of the pedal stud; d is the pedal
stud with its screwed pin which passes through the elastic locking lever into the
threaded socket of the crank arm e; f is the steady pin on the rim of the elastic
locking lever surrounding the hole c and engaging in one of the steady pin
holes g, g, g in the collar h of the pedal stud, d; i is the recess formed in the face
of the crank arm, e, and k is a set screw for preventing the free end of the projecting
arm 6 from slipping out of the recess i.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I would have it to be
understood that I do not claim as of my invention or the exclusive use of an elastic
locking lever or recessed crank arm except when the same are constructed and

page_text: employed substantially in the manner and for the purposes which I have described,
nor do I claim any of the separate mechanical parts employed in connection there-
with, but I declare that what I claim is:-
1. The use in bicycles and other pedomotors of a recessed crank arın constructed
and employed substantially in the manner and for the purposes herein before described
and shewn in the drawings hereunto annexed.
2. The use in bicycles and other pedomotors of an elastic locking lever constructed
and employed substantially in the manner and for the purposes hereinbefore described
and shewn in the drawings hereunto annexed.
3. The use in bicycles and other pedomotors of a pedal stud having a locking lever
firmly attached thereto substantially in the manner and for the purposes herein before
described and shewn in the drawings hereunto annexed, and
4. The combination and arrangement of parts constituting my improved method
of attaching pedal studs to crank arms constructed and employed substantially in
the manner and for the purposes hereinbefore described and illustrated by the
drawings hereunto annexed.
D
dave of Auruot 1000
HUGH
HYNDMAN,
10, Chichester Street, Belfast, Agent for Applicant.