A Detachable Extension Rod for Increasing the Propelling Power of Bicycle Oranks
Year: 1898

page_text: Date of Application, 4th June, 1898-Accepted, 17th Sept., 1898
A Detachable Extension Rod for Increasing the Propelling Power of
Bicycle Oranks,
I, WILLLAM HAMILTON LANDELLS, of Ashburton, Canterbury, in the Colony
of New Zealand, 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:-
This invention relates to a detachable extension rod for the cranks of bicycles,
having for its object to increase the effective leverage and propelling power of
the said cranks
In my invention an extension coupling 10d 18 pivotally connected to the outer
end of the crank by means of a stud or pin upon which the said extension rod
works, preferably on ball or cone bearings To the outer end of this extension
rod the pedal is attached as on the ordinary crank
•
Referring to the annexed drawings illustrating my invention
Fig.
18 a side view of a beaning bracket and ciank with the extension rod
connected thereto
Fig 2 is a side view of the extension 1od removed
Fig 3 is a vertical section of same showing stud and ball bearings
Fig 4 19 an end view of same showing lock pin
Fig 5 is a vertical section of the extension rod attached to stud without hall
beatings
Referring to Figs 1 to 4 inclusive, A is the detachable extension rod its upper
end having recessed boss with a hole to fit on the stud or pin B; such stud or
pin having a groove (e) in which the balls (b) work, the inner side of the boss
of extension rod being hollowed to it the balls while the recessed portion 18
screw threaded to receive the screw washer C whose une side 19 hollowed to
fit the balls whilst its outer edge is milled, a locking catch (e) being attached
to the edge of boss of extension rod by means of a screw (d) and having teeth
to engage the milled edge of the washer C so as to retain the washer in position
By slackening the screw () to enable the locking catch to clear the milled
edge of the washer C, the said washer may be screwed forward or backward as
may be required to adjust the balls when the screw (d) is again tightened to
secure the washer
The stud or pin B is passed through the end of crank D and secured by a nut
or other suitable means. and the pedal E 19 secured to the lower end of the exten-
sion rod A in a similar manner to that usually adopted in securing the pedal
direct to the crank
When the screw washer is secured by the locking catch the extension rod and
washer together can revolve round the stud or pin B
Referring to Fig. 5, A¹ 18 the detachable extension rod the boss of which is
plain so as to work upon a plain stud or pin B₁ having shouldered head or cap
as shown, the stud or pin being secured to the crank as before described
When the crank passes the top centre 'the pressure of the foot will tend to

page_text: push out the extension rod and thus obtain increased leverage until it reaches
the bottom centre; but as the crank rises the extension rod will assume a vertical
position or nearly so until the crank reaches the top centre again.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim 18:
1 The herein described detachable extension rod for the cranks of bicycles
substantially as and for the purpose herein described and illustrated in the
annexed drawings
2. In combination with the cranks of bicycles a detachablo extension rod
such as A fitted upon a stud or pin such as B attached to the crank and provided
with a groove to receive balls which are held in position by a screw washer
such as C having milled edge and retained by a locking catch such as (c) sub-
stantially as and for the purpose herein described and illustrated in Figs. 1 to 4
of the annexed drawings.
3. In combination with the cranks of bicycles, an extension rod such as A¹
fitted upon a plain stud or pin such as B attached to crank substantially as and
for the purpose herein described and illustrated in Fig 5, of the annexed
drawings
Loted #KT 9741
dov
топо
Loted thτ
топо
A. M & WM CLARK,
Chartered Patent Agents, 53, Chancery Lane, London