IMPROVEMENTS IN SLOW GEARING
Year: 1884

page_text: I EMIL CAPITAINE of 89 Chancery lane in the County of Middlesex civil
engineer of the firm Capitaine & von Hertling do hereby declare the nature of the
said invention for IMPROVEMENTS IN SLOW GEARING, to be as follows:-
This invention consists of an improved toothed wheel work being especially fit for
lifting-jacks or other lifting-apparatus. Till now a little toothed wheel with four
or five teeth at least and a larger tooth-wheel were gearing together in order
to reduce the movement i.c. in order to obtain the highest or best proportion of the
gearing. The inventor uses two crank-pius instead of the little toothed wheel
which pins gear together alternately with the teeth of that larger toothed wheel.
The crank-pins are arranged diametrically to the main-axis of the driving-shaft and
closely to it; the theoretical axes of these crank-pins being parallel with the axis
of revolution of the driving-shaft (belonging to them) and they have the same
distance from the axis of this shaft. One of these crank-pins must always be in
gear with the teeth of the larger wheel and therefore the teeth of the latter are
proportionally deeper than those of the ordinary toothed-wheels. As the one pin
is coming out of the clearing the other pin gears already with the next teeth. In
order to avoid friction of the crank-pins on the teeth the inventor sets pulleys on
the former,

page_text: "
I, EMIL CAPITAINE of 89 Chancery Lane in the County of Middlesex, Engineer,
do hereby declare the nature of the said invention for "IMPROVEMENTS IN SLOW
GEARING a communication to me from abroad by the Actien Gesellschaft Dülmen
(Eisenhütte Prinz Rudolph) Dülmen, Germany, and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:-
These improvements have for object the attainment in slow hand or engine
worked gearing of a relatively high standard of efficiency as compared with the
ordinary arrangement of toothed driving pinion and wheel. This object is attained
by the employment-instead of the ordinary toothed pinion of two driving pins
or studs fixed on or formed in one piece with the driving shaft.
Referring to the accompanying sheet of illustrative drawings:-
Figs 1, 2, 2, 3 and 4 shew an arrangement in which the driving pins or studs
are at the end of the driving shaft, and Figs. 5 and 5° shew the two driving pins or
studs inside or away from the end of the driving shaft.
A is the driving shaft worked direct by hand or by means of engine power,
having two pins or studs B provided with rollers C for the purpose of converting
the sliding friction into a rolling friction. D is the driven toothed spur or bevel
wheel or rack the teeth of which are rounded or curved where necessary to
correspond with the form of the pins or studs. In the case where the pins or studs
are at the end of the driving shaft the teeth of the wheel or rack may be shrouded
at one side as shewn in the drawing for the purpose of giving increased strength.
In the inside position as shown in Fig. 5 the rollers on the pins or studs may be
dispensed with.
Taking by way of example an ordinary hand winch the driving shaft of which
revolves directly over the drum shaft the irregular motion there present is in so far
advantageous for the utilisation of the power employed that when the hand lever is
at right angles to a line passing through the centre of the two pins or studs, the
hand lever is in the most favourable position for working over the points where the
greatest effort is required, whilst in the upper and lower positions of the lever only
the minimum of power is required to be exercised.
Where a regular motion is not absolutely necessary as for raising weights,
etcetera, this mechanism allows of the employment of a single cylinder engine
in the case of engine worked gear of this description, where a coupled or double
cylinder engine with cranks set at an angle of 90 degrees would otherwise be
necessary. Here also the same result is obtained as in the hand worked gear the
crank being in the same position relatively to the pins or studs as the hand lever,
the steam piston overcoming the greater and lesser resistances in the favourable
positions. When standing on the dead points the pins or studs lock the wheel so
that the load may hang as safely as when a brake or catch is employed.

page_text: 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
The arrangement on a shaft of two driving pins or studs with or without rollers
on them for giving motion to a toothed wheel or rack the shaft of which wheel may
be at any suitable angle to the driving shaft so that upon each revolution of the
driving shaft the toothed wheel or rack is caused to move through the distance of
two teeth, substantially as described.