Improvements in Wheel Gearing.
Year: 1896

page_text: Date of Application, 12th Sept., 1896
Complete Specification Left, 12th June, 1897-Accepted, 17th July, 1897
Improvements in Wheel Gearing.
I, CARL HEINRICH OTTO HAMANN, of Bergedorf, near Hamburg, in the Empire of
Germany, Gentleman, do hereby declare the nature of this invention to be as
follows:-
The subject of the present invention constitutes a curve gear for transmitting
rotary movements, and it consists substantially of a rotary driving part with curve-
shaped projections which are adapted to act upon pressing or pushing rollers of the
part to be driven so that the latter will receive a rotary movement corresponding
to the proportions chosen either in the same direction as the driving part or in
the opposite direction.
According to one form of the present invention the driving wheel arranged
upon the driving shaft is furnished on one side with two crescent-shaped or
sickle-shaped curve pieces, whilst the wheel to be driven is provided with a
number of pins with pressing rollers. The form and arrangement of the curve-
pieces and of the pressing rollers relatively to each other must be such that the
curve-pieces will, in the rotary movement of the driving wheel, slide between the
pressing rollers and will alternately act with a sliding pressure or push upon
the pressing rollers, for the purpose of effecting a continuous and uniform rotation of
the driven wheel in one or the other direction according to the direction of the
driving wheel.
In one constructional example, with a proportion of 25: 1 the arrangement is such
that the driven wheel turns in the same direction as the driving wheel.
In the operation of the device the first and seventh pressing rollers, which for the
sake of simplicity may here be designated by continuous numbers, bear against the
inner surface of the curve-piece. If now the curve wheel is turned, say to the right,
the first half of the inner surface of the first curve piece, sliding along the first
roller, will, by reason of its decreasing eccentricity, exert a traction or pressure upon
the first roller to cause the driven wheel to rotate in the same direction as the
driving wheel whilst the second inner half of the said first curve piece, sliding along
the seventh roller, will, in consequence of its eccentricity increasing to the same
extent, give to the said roller so much room that the first roller can follow the tractive
action and impart to the driven wheel a turning movement. to the right. The first
half therefore acts as a pressing edge, and the second half only as a guide edge, in
order to guide the wheels in a reliable manner and thereby to obviate the jars or
beating of the gearing. In the further rotary movement the parts pass from the
position above indicated to the position in which the inner edge of the first half of
the first curve piece discontinues to work, after the outer edge of the second curve
piece has already begun to act upon the seventh roller, and the inner edge of the
second half of the first curve-piece is about to leave the said roller, whilst the outer
edge of the same, sliding along the last or twenty-fifth roller begins to act as a
guide. In the next position, the outer edge of the first half of the second curve
piece has terminated its pushing work, whilst the inner edge of the same, taking
behind the first pressing roller is about to commence the work and the inner edge of
the second curve piece sliding on the sixth pressing roller, begins to guide. The further

page_text: positions of the respective parts of the device correspond to the positions above
described, only the curve-pieces have exchanged their positions and consequently
also their functions. When the driving or curve wheel has performed a complete
revolution, the driven wheel, noving in the same direction, has only been turned
through the width of a roller, that is to say through 1/25th of its periphery.
It will at once be evident that if the direction of the turning movement of the
driving or curve-wheel be reversed, the direction of the turning movement of the
driven wheel is changed to a corresponding direction, as the curve-faces then act in
the reverse manner and order upon the pressing rollers.
In order to increase the strength of the curve gearing in itself, I may provide
the driving wheel with several pairs of curves arranged concentrically to each other,
in which case several pressing edges will then always act at the same time upon
several pressing rollers. By giving a suitable form to the curve pieces and
appropriately arranging the pressing rollers I may moreover arrange the curve gear
in such a manner that the driven wheel, as in the case of a toothed wheel gear,
will turn in the opposite direction to that of the driving wheel.
Dated this 12th day of September 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Wheel Gearing.
I, CARL HEINRICH OTTO HAMANN, of Bergedorf, near Hamburg, in the Empire of
Germany, Gentleman, 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 :-
The subject of the present invention constitutes a curve gear for transmitting
rotary movements, and it consists substantially of a rotary driving part with curve-
shaped projections which are adapted to act upon pressing or pushing rollers of the
part to be driven so that the latter according to the form or shape of the curved
projections and to the arrangement of the rollers of the part to be driven will
receive a rotary movement corresponding to the proportions chosen either in the
same direction as the driving part or in the opposite direction.
In the accompanying drawing I have shown how my invention may be carried
into practice.
Figure 1 is an elevation and
Figure 2 a plan of my improved curve gear;
Figures 3 to 9 are diagrammatical views illustrating the action or mode of
operating of the said gear.
According to the form of the curve gear represented the driving wheel A
arranged upon the driving shaft a is furnished with two crescent-shaped or sickle-
shaped curve pieces s and s¹, whilst the wheel B to be driven is provided with a
number of pins c with pressing or antifriction rollers d. The form and arrange-
ment of the curve-pieces and of the pressing rollers relatively to each other must
be such that the curve-pieces will, in the rotary movement of the driving wheel,
slide between the pressing rollers and will alternately act with a sliding pressure or
push upon the pressing rollers, for the purpose of effecting a continuous and
uniform rotation of the driven wheel B iu one or the other direction according to
the direction of the driving wheel A.

page_text: In the constructional example shown, with a proportion of 25:1 the arrangement
is such that the driven wheel turns in the same direction as the driving wheel.
8
Supposing the curve gear be in operation and in the position shown in Figure 3
the first and seventh pressing rollers which for the sake of simplicity may here be
designated by continuous numbers, bear against the inner surface of the curve-
piece 8. If now the curve wheel A is turned, say to the right in the direction of
the arrow, the first half I of the inner surface of the curve piece 8, sliding along
the roller 1, will, by reason of its decreasing eccontricity, exert a traction or
pressure upon the roller 1 to cause the driven wheel B to rotate in the same
direction as the driving wheel A whilst the second inner half II of the said first
curve piece 8, sliding along the roller 7, will, in consequence of its eccentricity
increasing to the same extent, give to the said roller 7 so much room that the
roller 1 can follow the tractive action and impart to the driven wheel B a turning
movement to the right. The first half I therefore acts as a pressing edge, and the
second half II only as a guide edge, in order to guide the wheels A and B in a
reliable manner and thereby to obviate the jars or rattling of the gearing. In the
further rotary movement the parts pass from the position Figure 3 through the
position Figure 4 to the position Figure 5 in which the inner edge I of the curve
piece a discontinues to work, after the outer edge III of the second curve piece a
has already begun to act upon the roller 7, and the inner edge II of the first curve-
piece a is about to leave the roller 7, whilst the outer edge IV of the same, sliding
along the roller 25 begins to act as a guide. In the next position Figure 6 the
outer edge III of the second curve piece 8' has terminated its pushing work, whilst
the inner edge I of the same, taking behind the roller 1 is about to commence the
work and the inner edge II of the said curve piece sliding on the roller 6, begins
to guide. The further positions Figures 7, 8 and 9 of the respective parts of the
device correspond to the positions Figures 3, 4 and 5 above described, only the
curve-pieces a and a have exchanged their positions and consequently also their
functions as it will be clearly understood from the drawing without further
description. When the driving or curve wheel A, (Figure 9) reaches the position
Figure 3, it has performed a complete revolution, the driven wheel B, moving in
the same direction, has only been turned through the width of a roller, that is to
say, through th of its periphery. It will at once be evident that if the direction of
the turning movement of the driving or curve-wheel A be reversed, the direction
of the turning movement of the driven wheel B is changed to a corresponding
direction, as the curve-faces then act in the reverse manner and order upon the
pressing rollers d.
In order to increase the strength of the curve gearing in itself, I may provide
the driving wheel with several pairs of curves 8 al arranged concentrically to each
other, in which case several pressing edges will then always act at the same time
upon several pressing rollers. By suitably displacing the shaft a of the driving
wheel A or by using a driving wheel with differently shaped curve pieces respec-
tively, and by appropriately arranging the pressing rollers I may moreover arrange
the curve gear in such a manner that the driven wheel, as in the case of a toothed
wheel gear, will turn in the opposite direction to that of the driving wheel.
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. An improved wheel gearing for transmitting rotary movements characterized
by rotating crescent- or sickel-shaped curve-pieces adapted to act upon rollers of
the part to be driven in such a manner that the latter according to the shape or
form of the curve pieces and to the arrangement of the rollers will receive a rotary
movement corresponding to the proportion chosen either in the same or in the
opposite direction as the driving part, substantially as set forth.
2. In a wheel gearing for transmitting rotary movements the combination of a

page_text: driving part provided with sickle- or crescent-shaped curve pieces with a driven
part furnished with suitable rollers against which latter the edges of the said curve
pieces are acting, substantially as and for the purpose specified.
Dated this 12th day of June 1897.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.