Improvement in Forging Presses.
Year: 1889

page_text: Date of Application, 24th Dec., 1889
Complete Specification Left, 18th Sept., 1890-Accepted, 18th Oct., 1890
PROVISIONAL
SPECIFICATION.
Improvement in Forging Presses.
I, ALFRED TRAPPEN, of Wetter-on-the-Ruhr, Westphalia, in the Empire of Germany,
Director of the Maerkische Maschinenbau-Anstalt, do hereby declare the nature of
this invention to be as follows :—
My invention relates to an improved forging press or hydraulic hammer.
According to my said invention I provide the improved press intended for use in
forging or swaging iron or other metal, with two hydraulic press-cylinders arranged in
a vertical plane the one above the other, the lower one of which has a short stroke
and serves as the working cylinder. The piston of the said lower cylinder contains
the hammer proper and serves the purpose of imparting motion to the latter and
transmitting the required pressure thereto.
The upper press-cylinder has a relatively longer stroke than the said lower cylinder
and serves for adjusting the latter and its piston with the hammer in relation to the
piece of work to be forged, according to the thickness of the latter.
The upper cylinder is adapted to remain stationary, or at rest, during the operation
of the press.
D
11- Qul 1
בד '
1 1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement in Forging Presses.
I, ALFRED TRAPPEN, of Hounef on the Rhine in the Empire of Germany Director
of the Maerkische Maschinenbau-Anstalt, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
My invention relates to an improved forging press or hydraulic hammer, more
especially of the kind used for forging or swaging iron or other metals.
My said invention has for its object to allow of an easy adjustment of the hammer
proper according to the size or thickness of the piece of metal to be forged and, at
the same time, to enable the said forging press or hammer to be made cheaply.
My invention, therefore, consists in providing the said improved press with two
hydraulic press cylinders arranged the one above the other, the lower one of which
has a short stroke and serves as a working cylinder. The piston of the said lower
cylinder carries the hammer proper and serves the purpose of imparting motion to the
latter and transmitting the required pressure thereto.
The upper press cylinder has a relatively larger stroke than the said lower cylinder
and serves for adjusting the latter and its piston with the hammer in relation to the
piece of work to be forged, according to the thickness of the latter. The upper
cylinder is adapted to remain stationary or at rest, during the operation of the press.
The accompanying drawing shows a vertical section of a hydraulic press or hammer
constructed according to my said invention.
A is the upper press cylinder. B is the lower press cylinder. C is the piston of
the upper and D the piston of the lower cylinder, the latter piston carrying the
hammer proper E. Each of the cylinders A and B has a distributing valve motion,
being provided with water inlet and escape valves.
The lower cylinder B is attached to the piston C of the upper cylinder A and is
caused to approach the anvil F when water is admitted into the said upper cylinder A.

page_text: The said lower cylinder B is carried in a strong guide sliding on the columns G of
the press.
When the escape valve of the cylinder A is closed so as to prevent the water from.
escaping therefrom the piston of this cylinder will offer a resistance to the cylinder B
equal to the entire resistance of the press.
The movement of the piston D) of the lower cylinder B is caused by the admission
or discharge of water therefrom, by which means the entire pressure of the machine is
imparted to the piece of work to be forged, through the hammer proper E attached
to the said piston D.
It will be seen that by these means my hydraulic press or hammer may be equally
well adjusted either for à small or a large piece of work, by lowering or raising the
lower cylinder B accordingly.
For raising the lower press cylinder B, as well as the piston D carrying the hammer
proper, three small hydraulic cylinders H, J and K are provided, these being connected
with an accumulator containing water under a suitable pressure, but not shown in the
drawing.
Distributing valves may be dispensed with in this construction, the accumulator
serving merely as a counterweight without loosing any water, unless it be through the
stuffing boxes not being altogether tight.
The upper press cylinder may be fed with water under a low pressure such as will
generally be available from public water works or similar sources. Such pressure will,
in most cases, be found sufficient for moving the lower cylinder. When the press is at
work, the water in the upper cylinder will assume the same pressure which prevails in
the lower cylinder while forging a piece of work.
For the lower cylinder 1 preferably employ water under a high pressure, dispensing
with an accumulator. I preferably employ, instead, in connection with the improved
hydraulic press a double cylinder engine providing both steam cylinder piston rods
with a steel pressure pump at each end, both pistons with their rods and the plungers
being made rather tight so as to reduce the working parts to a minimum. The engine
should be kept under steam and should start to work as soon as the inlet valve of the
press is opened and should stop at once as soon as the said valve is closed again.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
First. A hydraulic press or hammer having two press cylinders arranged the one
above the other in such a manner that the one will serve as the working cylinder
actuating the hammer proper and the other will adjust the said working cylinder in
relation to the piece of work to be forged, according to the thickness of the latter.
Second. In a hydraulic press or hammer the combination with an upper press
cylinder A of a lower press cylinder B formed on the piston C of the upper cylinder A,
the piston D of the said lower cylinder B carrying the hammer proper E, substantially
as and for the purpose set forth.
Dated this 18th day of Santambar 1800.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.