Improvements in Rotary Cutters for Paring and Trimming Boot and Shoe Heels and the like.
Year: 1898

page_text: Date of Application, 31st Oct., 1898
Complete Specification Left, 10th July, 1899-Accepted, 19th Aug., 1899
PROVISIONAL SPECIFICATION.
Improvements in Rotary Cutters for Paring and Trimming Boot and
Shoe Heels and the like.
I, PAUL GÖRING, of Oberursel, in the Province of Hesse-Nassau, German
Empire, Mechanic, do hereby declare the nature of this invention to be as
follows:-
This invention relates to rotary cutters or cutting tools for paring and trimming
boot and shoe heels and the like, and has for its object various improvements
in the construction of the same.
The rotary cutter forming the subject of this invention, is provided with
an optional number of cutting surfaces for the before mentioned purpose of
trimming boot heels, the novel feature of the invention residing in the fact,
that the cutting surfaces proper are supported at their centre by connecting shanks
or ribs, which shanks or ribs connect the said cutting surfaces to the hub of
the rotary cutter.
Hitherto such paring or trimming rotary cutters were often constructed in
such manner, that the cutting surfaces were supported by a shank or rib at one
edge of the cutting surface, so that in this known system of rotary cutter the
cutting surfaces formed as it were, right angles with the shanks or ribs which
connected the same to the hub of the tool.
It will thus be clear, that in a rotary cutter constructed according to this
known system where, as hereinbefore stated, the cutting surface was only sup-
ported at one edge, that the said cutting surface in this instance formed a kind
of lever wherein the outer or non-supported edge of the cutter was exposed
to much greater vibration than the inner or supported edge, that is to say
the edge to which the rib or shank was connected. It therefore frequently happened
that rotary cutters having cutting surfaces constructed according to this system
frequently either became bent, or, the cutting surface snapped entirely at the
outer edge, whereby the said rotary cutter of course became useless.
I have obviated the above mentioned disadvantages in the rotary cutier
constructed according to my invention, and which I have illustrated in the
accompanying drawing.
In the said drawing Figure 1 represents a rotary cutter constructed according to
my improved system,
Figure 2 is a section on the line a-b, and
Figure 3 a section on the line c-d showing more especially the wedge-shaped
form of a connecting rib or shank.
In the drawing e represents the cutter surfaces; f the connecting-shanks or
ribs, & g the hub of the cutter.
As will be seen from Figure 3, the said connecting shanks or ribs are tapered,
whereby they obtain the wedge-shaped form shown in this figure.
This wedge-shaped form of the ribs cause the tool to present less hindrance to
the material during the cutting operation.

page_text: In conclusion as characteristic features of my improved rotary cutter I may
mention that in consequence of the cutting surfaces being supported at their
centre, the pared material can much more freely fall or pass away from the
cutting surfaces during the cutting, and another especial characteristic feature is
that the knives or cutting surfaces cannot so readily become blocked or bind, as
was previously the case, when the said cutting surfaces were only supported at
one side or edge.
Dated this 31st day of October 1898.
Improvements in Rotary Cutters for Paring and Trimming Boot and
Shoe Heels and the like.
I, PAUL GÖRING, of Oberursel, in the Province of Hesse-Nassau, German
Empire, Mechanician, 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 rotary cutters or cutting tools for paring and trimming
boot and shoe heels and the like, and has for its object various improvements
in the construction of the same.
The rotary cutter forming the subject of this invention, is provided with
an optional number of cutting surfaces for the before mentioned purpose of
trimming boot heels, the novel feature of the invention residing in the fact,
that the cutting surfaces proper are supported at their centre by connecting shanks
or ribs, which shanks or ribs connect the said cutting surfaces to the hub of
the rotary cutter.
Hitherto such paring or trimming rotary cutters were often constructed in.
such manner, that the cutting surfaces were supported by a shank or rib at one
edge of the cutting surface, so that in this known system of rotary cutter the
cutting surfaces formed as it were, right angles with the shanks or ribs which
connected the same to the hub of the tool.
It will thus be clear, that in a rotary cutter constructed according to this
known system where, as hereinbefore stated, the cutting surface was only sup-
ported at one edge, that the said cutting surface in this instance formed a kind
of lever wherein the outer or non-supported edge of the cutter was exposed
to much greater vibration than the inner or supported edge, that is to say
the edge to which the rib or shank was connected. It therefore happened
that rotary cutters having cutting surfaces constructed according to this system
frequently either became bent, or, the cutting surface snapped entirely at the
outer edge, whereby the said rotary cutter of course became useless.
I have obviated the above mentioned disadvantages in the rotary cutter
constructed according to my invention, and which I have illustrated in the
drawing filed with the Provisional Specification.
In the said drawing Fig. 1 represents a rotary cutter constructed according to
my improved system,
Fig. 2 is a section on the line a-b, and
Fig. 3 a section on the line c-d showing more especially the wedge-shaped
form of a connecting rib or shank.
In the drawing e represents the cutter surfaces; f the connecting-shanks or
ribs and g the hub of the cutter.

page_text: As will be seen from Fig. 3, the said connecting shanks or ribs are tapered,
whereby they obtain the wedge-shaped form shown in this figure.
This wedge-shaped form of the ribs causes the tool to present less hindrance to
the material during the cutting operation.
In conclusion as characteristic features of my improved rotary cutter I may
mention that in consequence of the cutting surfaces being supported at their
centre the pared material can much more freely fall or pass away from the
cutting surfaces during the cutting, and another especial characteristic feature is
that the knives or cutting surfaces cannot so readily become blocked or bind, as
was previously the case, when the said cutting surfaces were only supported at
one side or edge.
Having now particularly described and ascertained the nature of my
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
In a rotary cutter for paring and trimming boot and shoe heels the combination
of a hub with cutting surfaces connected to the hub by means of tapered connect-
ing shanks substantially as and for the purpose described.
banct
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.