Improvements in or connected with Driving Gear for Oyclés.
Year: 1898

page_text: Date of Application, 15th Nov., 1898
Complete Specification Left, 12th Aug., 1899-Acoepted, 23rd Sept., 1899
PROVISIONAL SPECIFICATION.
Improvements in or connected with Driving Gear for Oyclés.
I, HANS BUCHNER, of 16, Thorwaldsenstrasse, Munich, in the Empire of
Germany, Professor at the Royal University, do hereby declare the nature of
this invention to be as follows:-
This invention relates to a treadle lever driving gear for cycles. The novelty
in it consists in the cranks on which the treadle levers work being provided
with one or more rollers which make the lift of the treadle levers short whilst
when they are depressed the length of the crank is as long as possible.
A roller is mounted on each of the cranks, on which roller there bears a
treadle lever pivotally mounted on the frame at or near the axis of the rear wheel.
When said lever is depressed it presses on the said roller and on the crank so
that the wheel is rotated. As however with such a length of crank as is neces-
sary for the production of sufficient power, the travel of the treadle lever would
be too great in proportion to the length of the human leg, the downward move-
ment of the treadle lever is artificially shortened or limited. This takes place
by a second roller arranged in close proximity to the axis of the crank by which
the treadle lever in the lower section of its phase of movement is received and
again raised in order to finally pass back on to the first roller.
In order however to avoid any jolt in rapid transference of the treadle lever
from the one roller to the other roller, oval shaped intermediate pieces having
semicircular recesses for the rollers are firmly arranged on the cranks between
the rollers which render possible à gradual transfer or travel of the pedal levers
from one roller to the other by said lever bearing and sliding on the intermediate
piece.
The motion of the crank shaft may be transmitted to the rear wheel by chain
gear or any other suitable means.
COMPLETE SPECIFICATION.
Improvements in or connected with Driving Gear for Cycles.
I, HANS BUCHNER, of 16, Thorwaldsenstrasse, Munich, in the Empire of
Germany, Professor at the Royal University, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:—
This invention relates to a treadle lever driving gear for cycles. The novelty

page_text: in it consists in each of the cranks on which the treadle levers work being
provided with an oval disc, which discs make the lift of the treadle levers short
whilst when they are depressed the length of the crank is as long as possible.
In order as far as possible to diminish the friction between the-trendle levers
and those parts of said discs on which the treadle levers mainly press, the discs
are preferably arranged as will be hereinafter described.
The apparatus is shown in the accompanying drawings:-
Figure 1 being a side view of a bicycle fitted with this driving gear, and
Figures 2 and 3 detail views of the mechanism.
A roller.a, Figure 1 is mounted on each of the cranks, on which roller there
bears a treadle lever h pivotally mounted at the point on the frame at or near
the axis of the rear wheel. When said lever is depressed it presses on the said
roller a, so that the wheel is rotated. As however with such a length of crank
as is necessary for the production of sufficient power, the travel of the treadle
lever would be too great in proportion to the length of the human leg, the down-
ward movement of the treadle lever is artificially shortened or limited. This
takes place by the aforesaid discs being mounted obliquely on the cranks or by
"a second roller c being arranged in closer proximity to the axis of the crank by
which the treadle lever in the lower section of its phase of movement is received
and again raised in order to finally pass back on to the first roller a.
In order however to avoid any jolt in rapid transference of the treadle lever
from the roller a to the roller c oval shaped intermediate pieces having semi-
circular recesses for the rollers are firmly arranged on the cranks between the
rollers a and c, which pieces render possible a gradual transfer or travel of the
pedal levers from one roller to the other by said lever bearing and sliding on
the intermediate piece.
The motion of the crank shaft may be transmitted to the rear wheel by chain
gear or any other suitable means, and the cranks may be provided with two or
more rollers, if desirable.
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 is:-
1. A driving gear for cycles characterized by each crank arm carrying at its
end an oval disc obliquely mounted with the object of making the lift of the
treadle levers short and the length of the cranks on descent as long as possible,
substantially as hereinbefore described.
2. A driving gear for cycles such as described characterized by each crank
arm having at its end two or more rollers (a c) situated at different distances
from the axis of the crank, which rollers are combined into an oval body by
means of intermediate pieces (d), substantially as described.
Date AL! AL
1000
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