IMPROVEMENTS IN APPARATUS FOR BENDING METAL TUBES
Year: 1880

page_text: LETTERS PATENT to Herbert John Haddan, of the Firm of Herbert and
Company, Solicitors of Patents, of 67, Strand, in the City of Westminster,
Civil Engineer, for an Invention of "IMPROVEMENTS IN APPARATUS FOR
BENDING METAL TUBES." A communication from abroad by Gustav Riese,
of Plagwitz, in the Kingdom of Saxony.
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at the
Office of the Commissioners of Patents on the 8th July 1880.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors
of Patents, of 67, Strand, in the City of Westminster, Civil Engineer.
"IMPROVEMENTS IN APPARATUS FOR BENDING METAL TUBES." A communication
from abroad by Gustav Riese, of Plugwitz, in the Kingdom of Saxony.
This Invention relates to apparatus for bending metal tubes, and consists chiefly
in introducing into the tube to be bent a round disc provided with a sharp edge,
and having a triangular opening, into which projects a pin or head fixed
excentrically to the end of a (horizontal) shaft, so that the turning of the shaft
causes the disc to be pressed upward against the interior of the tube and to produce
a fold on the inner (concavo) side of the intended bend. The said folding disc is
guided between two circular holding discs bevelled at the circumference, and
having approximately the diameter of the inside of the tube, one of the holders
forming a bearing for the shaft, the other end of which is supported by the
machine frame and provided with a crank. The tube with the folding tool inside
is inserted into two oxchangeable steel plates placed nearly parallel and vertical,
one of them being attached to a fixed standard, and the other to a movable frame
hinged at the bottom and provided with a lever, by which it can be turned from
or against the fixed steel plato. The standards are also divided horizontally, the
halvos being hinged together and provided with suitable locking devices.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddan in the Great Seal Patent Office on the 6th
January 1881.
HERBERT JOHN HADDAN, of the Firm of Herbert and Company, Solicitors
of Patents, of 67, Strand, in the City of Westminster, Civil Engineer.
IMPROVEMENTS IN APPARATUS FOR BENDING METAL TUBES." A communication
from abroad by Gustav Riese, of Plagwitz, in the Kingdom of Saxony.
"
The machine for bending metal tubes, as illustrated in the accompanying
Drawings, Figs. 1 to 9, has various peculiarities, which consist substantially in the
following-In Riese's machine the mechanism for shifting the cylindrical tube is
omitted; the correct feed of the knee to be bent is obtained by means of the stop
piece ɑ, and may be effected by hand. The folds are further produced in a novel
manner, by which the metal cylinder retains always-the-same-position-during the
formation of folds. The apparatus designed for producing this effect is constructed
substantially as follows:-The shaft A is held in a bearing at B, and carries at one
end the crank C, while at the other end the pin D is fastened eccentrically in the
boss E. By simply turning the shaft A. the eccentric pin is moved corrospondingly,
and thereby the disc F displaced. The disc F is provided in its centre with an
(approximately tricurved) opening, whereby the eccentric pin shifts the disc F
only in one direction, that is to say, upwards. This (rolling) mode of shifting the s
disc F effects the preliminary operation in forming the fold, for the protruding from
the circumference of the head G the disc widens the metal cylinder into a fold, the
said metal cylinder being held by the disc holders Hand J with steel discs i, i'.
After this preliminary formation of the fold has been effected by a turn of the
crank the fold is finished by pressing the steel discs together-by-means-of-the-disc-
holders Hand J, actuated by the lever L and the coupled levers M and N. By
this arrangement the shifting of the sheet metal cylinder during the preliminary
and final formation of the folds is rendered unnecessary, and it is possible to
operate on sheet metal cylinders while they are held fast, which is not the case in
producing a knee by Bertram's machine. A further peculiarity of Riese's machine
are the exchangeable steel discs i, i, set into the disc holders H and J, which discs
enable the same machine to operate on sheet metal cylinders of different diameters.
As a novel feature may also be mentioned the locking of the disc holders H and J
by means of the lever L and the coupled levers A and N. A ratchet is applied to
the crank C so as to allow the revolution of the shaft A only in one direction, the
said ratchet falling into the corresponding recess m of the crank-hub after every
revolution of the crank.
Having now described the Invention, as communicated to me by my foreign
correspondent, I claim,―
1.) In machines for bending tubes into knees the method, substantially as
described, for producing folds by turning a shaft A provided with an eccentric
pin D acting on a disc F, and for finishing the folds by means of the disc holders
Hand J, and levers L, M, and N.
2.) The exchangeable discs i and i¹ serving for finishing the folds.
3.) The locking of the disc holders by means of the lever L and the coupled
levers Land M.
In witness whereof, I, the said Herbert John Haddan, have hereunto set