IMPROVEMENTS IN BOBBINS FOR SPINNING MACHINES
Year: 1876

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth & Company, Patent
Agency, of Frankfort-on-the-Main, in the Empire of Germany, for the Inven-
tion of "IMPROVEMENTS IN BOBBINS FOR SPINNING MACHINES." A commu-
nication from the "Hannover Gummi Kamm Company," of Hannover, in the
Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 6th March 1876.
FRANK WIRTH, of the Firm of Wirth & Company, Patcut Agency, of Frankfort-
on-the-Main, in the Empire of Germany. IMPROVEMENTS IN BOBBINS FOR
SPINNING MACHINES." A communication.
The said Invention relates more particularly to improvements in the manufacture
of wooden bobbins for spinning machines, and consists in giving to the head of
such wooden bobbins a peculiar form, and further in covering the said head with a
cap of hard caoutchouc. The said cap is made of hard caoutchouc, and has a lower
opening, the diameter of which is smaller than that of the wooden heads of the
bobbins; if therefore the cap is to be put on the said head it must previously be
somewhat heated so that the caoutchouc mass becomes soft and elastic. In such
state the cap can be drawn upon the bobbin's head. When the caoutchouc has
become cool again the cap is fixed firmly to the bobbin's head. The bobbins which
are provided with such a cap may be continued longer in use than that made
entirely of wood, and if the spindle hole of the wooden body is by friction with the
spindle worn out the caoutchouc cap may be used for another bobbin.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 1st September
1876.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Agency, of Frankfort-
on-the-Main, in the Empire of Germany. IMPROVEMENTS IN BOBBINS FOR

page_text: SPINNING MACHINES." A communication from the "Hannover Gummi Kamm
Company," of Hannover, in the Empire of Germany.
The said Invention relates more particularly to improvements in the manufacture
of wooden bobbins for spinning machines, and consists in giving to the head of such
wooden bobbins a peculiar form, and further in covering the said head with a cap of
hard caoutchouc.
One of my improved bobbins is represented in the accompanying Drawing, in
which,―
Figure 1 is an exterior view of the said bobbin; Figure 2 is a vertical section of
the same.
Figure 3 is an exterior view of a bobbin whose cap is detached; Figure 4 is a
plan of the cap placed on the bobbin; and Figure 5 is an under side view of the
said cap detached from the bobbin.
The said cap A is made of hard caoutchouc, and as shown in the Drawing has a
lower opening, the diameter of which is smaller than that of the wooden head B of
the bobbin; if therefore the cap is to be put on the said head it must previously be
somewhat heated, so that the caoutchouc mass becomes soft and elastic. In this
state the cap can be drawn upon the bobbin head. When the caoutchouc lias
become cool again the cap is fixed firmly to the bobbin head. The bobbins provided
with such a cap may be kept longer in use than those made entirely of wood, and
if the spindle hole of the wooden body is worn out by friction with the spindle the
caoutchouc cap may be used for another bobbin.
Having thus fully described the said Invention as communicated to me, and the
manner of performing the same, I wish it understood that I claim,—
First. The cap A of a spinning machine bobbin formed of caoutchouc, gutta percha,
or other similar material.
Second. The wooden body with the peculiar formed head B, as above described.
Third. The combination of the above parts as above described in such a manner
that they may be separated or disconnected at any time.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand and
seal, this Twenty-sixth day of August, in the year of our Lord One thousand
eight hundred and seventy-six.
FRANK WIRTH. (L.S.)