IMPROVEMENTS IN THE MODE OF EXPANDING AND COMPRESSING TUBES
Year: 1878

page_text: LETTERS PATENT to Charles Max Sombart, of the Firm of Buss, Sombart, and
Company, Engineers and Patent Agents, of Magdeburg, in the Empire of
Germany, for the Invention of "IMPROVEMENTS IN THE MODE OF EXPANDING
AND COMPRESSING TUBES." A communication from Hermann Gruson, of
Buckau, near Magdeburg, in the Empire of Germany.
Sealed the 11th March 1879, and dated the 21st September 1878.
PROVISIONAL SPECIFICATION left by the said Charles Max Sombart at
the Office of the Commissioners of Patents on the 21st September 1878.
CHARLES MAX SOMBART, of the Firm of Buss, Sombart, and Company, Engineers
and Patent Agents, of Magdeburg, in the Empire of Germany. "IMPROVEMENTS IN
THE MODE OF EXPANDING AND COMPRESSING TUBES." A communication from
Hermann Gruson, of Buckau, near Magdeburg, in the Empire of Germany.
The improvements consist in expanding the inside diameter and compressing the
substance of tubes made of wrought metal or other expansive material by means of
a piston or pistons forced through or in such tubes hydraulically, the apertures of
the tubes being previously plugged in any manner suitable for resisting the pressure
employed; also suitable inlets provided for the admission of liquid. The piston can
be made of compressed and hardened metal, and the liquid admitted to act on it
direct.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Max Sombart in the Great Seal Patent Office on the 18th
March 1879.
CHARLES MAX SOMBART, of the Firm of Buss, Sombart, and Company, Engineers
and Patent Agents, of Magdeburg, in the Empire of Germany. "IMPROVEMENTS IN
THE MODE OF EXPANDING AND COMPRESSING TUBES." A communication from
Hermann Gruson, of Buckau, near Magdeburg, in the Empire of Germany.
The improvements are applicable to various kinds of tubes, but especially to gun
barrels, and consist in expanding the inside diameter and compressing the material
of tubes made of wrought metal or other expansive material by means of a piston
or pistons forced through or into such tubes, bydraulically, the apertures being
previously plugged in any manner suitable for resisting the pressure employed; also
suitable inlets provided for the admission of liquid. The piston can be made of
compressed and hardened metal, and the liquid admitted to act on it directly, as
shown in the accompanying Drawing. A represents the tube to be expanded, which
is tightly closed at one end by a screw, B, or by any other convenient contrivance,
and which is also provided with an inlet c ord. C is a conical or otherwise suitably
shaped water-tight piston, which is forced through the tube by a pressure, liquid
being admitted at c or d, thus widening the inside diameter and compressing the
material of the tube.-CLAIM. The expansion and compression of tubes by means of
a suitable piston, which is forced through or into the tube in question by the
pressure of a liquid acting directly on the piston.
In witness whereof, I, the said Charles Max Sombart, have hereunto set
my hand and seal, this Fourteenth day of March, A.D. 1879.
CHARLES MAX SOMBART. (L.S.)
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