Year: 1887

page_text: Date of Application, 3rd May, 1887
Complete Left, 24th Jan., 1888
Complete Accepted, 24th Feb., 1888
We, PAUL LEOPOLD GERISCHER, Merchant, and FRIEDRICH WILHELM MARTIN
SCHRÖDER, Manufacturer, both of Leipzig, in the Kingdom of Saxony, do hereby
declare the nature of this invention, to be as follows :-
This invention relates to an improved mechanism for compensating the unequal
motion of treadle-wheels resulting from the arrangement of a poise in the wheel for
giving the treadle-crank always a suitable position.
The improved mechanism consists of a crank one arm of which moves in a slot,
radially arranged in the fly-wheel, while another, and shorter arm, is connected by a
rod with the treadle.
To move this mechanism the shorter arm of the crank is turned by foot-pressure or
by hand, in which latter case it is provided with a turning handle.
The shorter arm imparts its motion to the crank shaft, whence it is transmitted to
the longer arm which moves the fly wheel and with it the main shaft by running in
the slot of the fly-wheel.
The crank shaft is so arranged with regard to the main shaft, that the longer crank
arm acts eccentrically on the fly-wheel and moves with its free extremity, with each
revolution of the fly-wheel, more or less in the slot towards the middle of the main- or
fly-wheel-shaft and downwards again corresponding to the vertical distance of the two
shafts, i.e. to the amount of eccentricity employed.
The longer crank-arm is so arranged from the fly-wheel-shaft, corresponding to the
direction of the revolution, that the lever-length, with which the fly-wheel is moved
from the crank arm, is the greatest, when the poise of the fly-wheel acts with its
gravity against the revolution of the fly-wheel and this lever-length is the smallest
when the poise has arrived at its contrary position, in which case its gravity

page_text: contributes to the revolution of the fly-wheel. Therefore the lever-length, with which the
fly-wheel is moved is increased with each revolution in the same proportion, in which
the action of the poise against the revolution of the fly-wheel increases and is
decreased again in the same proportion in which the action of the poise for the
revolution of the fly-wheel increases, whereby the utilisation of force of each
revolution is more uniformly distributed and a more uniform motion of the fly-wheel
obtained.

page_text: We, PAUL LEOPOLD GERISOHER, Merchant, and FRIEDRICH WILHELM MARTIN
SCHRÖDER Manufacturer, both of Leipzig in the Kingdom of Saxony, do hereby
declare the nature of our said 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 fly-wheels driven by gear from treadles, crank handles,
pedal or hand levers or the like, said fly-wheels being weighted whereby they attain
such position of rest that the treadles or the like are situated in such position that
force brought to bear thereon may be most effectively employed. The object of the
invention is to compensate for the unequal amount of power required for driving such
weighted fly-wheel during various portions of its revolution and consists in an
improved gear or mechanism for this purpose.
Referring to the accompanying drawing Fig. 1 is a side view, Fig. 2 a vertical
section and Fig. 3 a plan of the fly-wheel and improved mechanism as constructed to
be actuated with the foot, Figs. 4-6 represent details.
The mechanism consists of the shaft a with crank b the crank pin of which catches
into a slot i radially contrived in the fly-wheel said shaft having also the crank c
which is connected by the rod z with the levers g.
To actuate the mechanism the crank c is turned in the known manner from the
lever g by alternate pressing down with the foot, or by hand in which latter case the
crank has a suitable shape.
With the crank c revolves the shaft a and crank b whence the motion is imparted
to the fly-wheelf and to the shaft d to be moved.
The shaft a is so journalled with regard to the shaft d, that the pin of crank b
moves eccentrically with regard to the centre of the fly-wheel f and moves according
to the axial distance of the shafts a and d, or according to the amount of the
eccentricity arranged, more or less on each revolution of the fly-wheel ƒ back and
forth in the slot i of the latter.
The revolution of the fly-wheel takes place in the direction of the arrow in Fig. 1
and the crank b acting eccentrically on the fly-wheel is so arranged from the shaft d
that, as shown by Fig. 5, the leverage with which the fly-wheel is moved from the
crank 6 increases and decreases corresponding to the moment of the weight S and
according to whether the latter be negative or positive, that is to say opposed to or
assisting the revolution of the fly-wheel.
Power is more uniformly distributed on the whole course for each revolution and a
more uniform movement of the fly-wheel is produced. The pin of the crank b slides
in the slot i either with the roll h as shown by Fig. 6, or without the same,

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what we
claim is :-
The combination with fly-wheel having weight S and slot i of crank a b c journalled
eccentrically of said fly-wheel and capable of revolving the same with leverage
increasing with negative moment of said weight and decreasing with positive moment
thereof as and for the purpose set forth.