1. * GB780131 (A)
Description: GB780131 (A) ? 1957-07-31
Improvements in or relating to screw presses
Description of GB780131 (A)
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The EPO does not accept any responsibility for the accuracy of data
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up-to-date or fit for specific purposes.
PATENT SPECIFICATION
Date of Application and filing Complete Specification: March 28, 1955.
780,131 No. 9014155.
y, Application made in Germany on March 29, 1954.
Complete Specification Published: July 31, 1957.
Index at acceptance:-Class 87(2), F1C.
International Classification:-B30c.
COMPLETE SPECIFICATION lhnprovements in or relating to Screw Presses
We, MASCHINENFABRIK HASENCLEvER AKTIENGESELLSCHAFT, a Company
organised under German Law, of 55, Witzelstrasse, Dusseldorf, Germany,
do hereby declare the invention, for which we pray that a patent may
be granted to us, and the method by which it is to be performed, to be
particularly described in and by the following statement:-
This invention relates to improvements in or relating to screw
presses.
It has previously been proposed in screw presses to form the mounting

2. for the sliding head at the bottom of the screw spindle as a thrust
bearing or to provide it with a thread by means of which the screwed
spindle is connected to the head.
Such constructions of the mounting are unsatisfactory, because they
give rise to the occurrence of notch effects. Both the thrust bearing
as well as threads therefore produce interruptions owing to screw
breakages.
Furthermore owing to such threads the crosssectional area of the screw
which serves to take the pressure is greatly limited, because the
threads are on the outer circumference of the screw, so that during
pressing operation even at relatively low pressures deformations of
the screw spindle occur at the bottom thereof. Thus the dismantling of
such deformed screw spindles is made more difficult and is delayed. It
is an object of the invention to provide an improved screw press in
which these disadvantages are overcome.
According to this invention there is provided a screw press having a
hollow screw spindle through which a suspension rod extends
longitudinally, which rod engages in a thrust bearing assembly which
carries the sliding head and is mounted at one end of the spindle,
said rod, which together with the movable parts of the bearing
assembly and the spindle is rotatably mounted, being adapted to be
stressed against the other end of the spindle.
A number of considerable advantages re[Price 3/6] suits from this
mounting of the slide. First the dangerous notch effects at the base
of the screw are avoided, so that screw breakages are no longer to be
feared. The long suspension rod possesses a relativelylargeelongation
and is therefore very elastic. This property is of considerable
importance especially in the case of jarring blows of the machine,
because as a result the base of the screw is protected from undue
stresses. 55 Since the bore of the screw spindle necessary to
accommodate the suspension rod only occupies the innermost part
thereof which is generally not considered as the load carrying
cross-sectional area, the strength of the screw 60 spindle is in no
way weakened. The losses at the cross-sectional areas which
effectively transmit pressure are thus considerably less than with an
arrangement of threads around the circumference of the screw, so that
with 65 the same diameter of the core of the screw, the centrally
bored screw can take greater pressure than the same screw with
external threads.
The attachment of the suspension rod is 70 preferably effected by the
suspension rod engaging, via a threaded attachment, a pivot bearing
which is held between a thrust plate and a threaded ring of the
sliding head. At the opposite end it requires only a threaded 75 nut,
to be able securely to mount the suspension rod on a second threaded

3. attachment arranged opposite to the first one.
One preferred embodiment by way of example of invention is shown in
the accompanying drawing which is a longitudinal section through a
screw press constructed according to the invention.
1 denotes the screw spindle, which is provided with a longitudinal
bore 2. A journal 85.
portion 3 of the screw 1 carries a flywheel disc 4. A spindle nut 5 is
mounted in a traverse 6 of the screw press and kept in position by a
flange plate 7. The sliding head is indicated at 8. It has a recess 9,
in 9g -bPc r,- 2.5 p's 1 780,131 which first there is a thrust plate
10. Opposite the bearing socket 10 is a pivot bearing 11, which has a
threaded bore at 12. In this threaded bore 12 the threaded attachment
13 of the suspension rod 14 is accommodated, on wvhich, according to
the invention the sliding head is suspended. The pivot bearing 11 is
kept in place by a threaded ring 15.
The other end of the suspension rod 14 has a further threaded
attachment 16, which is accommodated in a nut 17, which itself abuts
against the face of the journal portion 3 securing means (not shown)
being provided to retain the nut 17 in its place. As wvill be seen
from the drawing suspension rod 14 is a long thin member having
enlarged threaded portions at its ends which enable a variable
prestressing to be applied thereto.
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* 5.8.23.4; 93p