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Патент USA US2119162

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‘ May 31, 1938.
’
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H. A. HARTNER
2,119,162
SCREW PRESS
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Filed larch-2, 1936
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'2 Sheets-Sheet 2
' INVENTOR'I
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Jii/L?ariner
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a
" Patented May. 31, ‘1938
‘ 2,119,162
vuru?ap STATES "PATENT OFFICE"
2,119,162
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SCREW PRESS
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Hans Andreas I'lar'tner, Oslo,_ Norway "
.7 Application March 2, 1936, Serial No. 6,636?‘ 4
v _.
In Norway March 5, 1935
8 Claims. (Cl. 100-48)
In known screw‘ presses for pressing-out liquid
impractical length and the pressing action is bad
from di?erent kinds of masses the screw is made
either with a. core varying in diameter in rela
at the inlet portion, because at that place the
tion to the external diameter or the threads from
threadsare atv a too great )distance from each
other.
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inlet towards outlet, or the pitch may decrease - The present invention has for its purpose to 5
provide a press in which the abovementioned
gradually towards the outlet, the external diame
‘
ter of the threads and also the diameter of the drawback is avoided. Screws are herein being
used consisting of at least two sections arranged‘ ~
core being constant, or; both measures being com
one behind the other and provided 'with an inter
binédIn'both cases a pressing action is ob
10 tained whichcorresponds-td the volume of the mediate tapered connecting portion, so con- 10
space between‘the‘threads at both ends of the‘ *structed that two" neighboring sectionshave a
screw. ,This volume is termed “thread volume”
thread volume decreasing continuously towards
in the following. I
the outlet‘ and the section located next to the
.
In screw presses‘of this kind, however, his I outlet of the ‘press is made with a smaller ex
15 a'well known inconvenience that the inass' to be
pressed in order to be'liberated from liquid, is
liable to follow around with the screw inside the.
perforated press casing, so that the material'ob
'structs the screw press and stops its operation.
.20 <IAnH order to avoid this drawback, different meas
ures have been used. The screw has been divided
ternal thread diameter at the .inlet- end than 15‘
that of the other section. at ‘the outlet end, and
that the tapered connecting portion of the short
er length operates with orwithout a continuous
pressing action as a transition portion‘for the
mass from the section with the greater diameter 20
to that with the smaller diameter.
The tapered transition portion makes it'po‘ssi
up into sections separated bya cylindrical por
tion against which knives or the like project“ ble to make the pitch of the screw section having
inwards from outside», and the press has been the greatest diameter smaller than in the case
25 made with two or more screws, the threads .of
which interengage, so that the engagement pre
- vents the mass from‘ following’ around with the
screws.
.
The present invention relates to screw presses
30'.
the same. external thread, ‘diameter ‘be used 25 )
throughout the length, because a greater thread
volume corresponds to a- greater external thread
diameter Ior‘the same \core diameter. “In the
press arrangement of the present application
each screw section may have a constant external 30
thread diameter throughout the length, an in
two or'more press screws, arranged. side by side ‘ creasing or decreasing core diameter being ‘com
is not“‘equally perfect throughout thelength of , bined with a pitch which is constant or decreas- .
a - the screw. For instance, it both screws are made. jng towards the outlet on a greater or'smaller
35"
_
' with a constant external ‘thread: diameter portion of thesecti'on length.
of the last-named‘ kind. In the known presses,
however, the‘ engagement between the‘threads of
throughout the length and‘lhaving a tapered core,
a sufficient engagement {between each pair of
screws is obtained at theoutlet portion of the
ceeding portions need not be perforated, but may
be unperforated. If perforations are desired, it
press, butthe engagement becomes worse nearer
' will be suitable to arrange the holes in peripheral
to the inlet portiomwhere the engagement may
40
‘ Thev transition portion between .any two ‘suc
direction.
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feet and equally good engagement throughout
‘The invention is illustrated in several embodi
ments in the drawings, wherein Fig. 1 showsa.
vertical section throughthe press and Fig. 2 a
the length of) the screws may be obtained. if the
plan view of Fig. 1 of both pressing screws, the
be so imperfect that the mass to a high degree '
follows around with the screw. However, a per
45 screws are made with constantexternal and in
ternal thread diameters, and provided with an
inwardly cylindrical press casing and a cylindric
surrounding press casing being only indicated by‘ 45
its internal outline. Figs. 3 and 4 show in simi- _
lar manner as Fig. 2 modi?ed embodiments of the _
screw core, but in order to bring about a pressing screws. Fig. 5 shows ‘a portion of the} screws
vaction, it is also necessary to make the screws wherein the transition portion has/threads with
with variable pitch, viz: with‘ a pitch decreasing a constant thread volume ‘throughout its axial 50
towards the outlet, because only then a‘ gradually
Reference character I indicates the inlet for
decreasing thread volumeis obtained. However,
'thisresults in the pitch becoming excessively ‘ the mass tovbe pressed and 2 the outlet. 3 is
length.
‘ great at the inlet as compared‘with that at the
55
outlet. , Consequently the screw requires a great v
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the pressing casing whichlmay be ‘made in the
usual manner by longitudinal'bars arranged with 55
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2,119,162
suitable intermediate spaces in peripheral direc
tion. These bars are held fast by means of sur
rounding strong rings 4. In this case each of the
two screws is composed of two sections, viz: ‘an
inlet section 5 and an outlet section 6. Section 5
The arrangement described above may obvious
ly be utilized in screw presses having two or more
screws. Usually it would be suitable to divide
Jthe screw along its length and, in accordance with
the several sections, on the separated longitudinal
portions, so that each section may be made sepa
is arranged in the inlet casing 1, which has a
perforated member 8. The screw 5 is made with rately with the. dimensions and from the ma
a constant external thread diameter and also terials which are found to be best suitable as
with a constant diameter of the screw .‘core 9._ regards the prevailing pressing pressures and
other conditions for the section in ,question. 10
10 However, the pitch of the threads decreases from
the inlet place just under the hopper I towards Thus, generally the screw section 5 in the inlet
the outlet‘ 2 as clearly seen from Fig. 1. The portion will be considerably less strained than
second screw section 6 is also made with a con
stant external thread diameter. but here the
15 screw pitch is constant throughout the length,
whereas the core 8 is made tapered having an
the section 6, where the strongest pressing takesv
place. Therefore, it is suitable to make the
screw section 5 of cast iron, whereas the section 6 15
is made of steel.
.
.
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increasing diameter towards the outlet 2, where- ; I claim:—
'1. A screw press, comprising a press casing, two
by a constantly decreasing thread volume to
‘ longitudinal screws so arranged rotatably side by
wards the outlet, is obtained.
20
The screw section 5 is also seen as being made
with a greater external thread diameter than
that of the section 6. The two sections are con
, nected together by a transition portion ill of a
side therein 1 that their threads intermesh with 20
each other, an inlet at one casing end and an out
let at the other one, each screw being made of.
at least two sections on the same axial line, each
tapered shape. Between both sections the screw .with a thread volume. decreasing continuously
towards the casing outlet,- any section located 25
The dimen
25 threads are shaped correspondingly.
sions may for instance be made in such a manner
next to the casing outlet having a smaller ex
that the transition portion has throughout'its
length the-same thread volume as the left hand
terior thread diameter at its inlet end than its
neighboring co-axial section has at its outlet
end of the section I and the right, hand end of - and located next to the casing inlet of each pair
v30 the section 6, in which case obviously no pressing
action will occur. but only a conveyance in the
portion l0. Also it is not necessary to provide
the screw at the part surrounded by the transition
portion ill with threads, as shown in- Fig. 4-, al
35 though this is of course most suitable.
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of neighboring co-axial sections‘ under consider
ation, saidsectlons being joined ltogether through
30
an intermediate tapered. transition portion of
‘short axial length to conduct the mass from one
screw section to the next screw section.
2. A screw press, comprising a press casing, a 85
' From Fig. 2 it appears that the intereng-age - plurality of longitudinal screws arranged rotat
ment of the, two screws located side by side is ably side by side therein so that their threads
perfect at the outlet 2, but becomes constantly intermesh-with each other, an inlet at one casing
less perfect towards the'tr‘ansition portion l0,
40 because the core diameter of the section 8 be
comes smaller. This unfavorable condition, how
ever, is eliminated at the portion l0, so that the
engagement between the screw sections -5 in the
inletportion 1 is perfect.
_
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. end and an outlet at the‘. other one, each screw
being made of at least two sections on the same
axial line, each with a thread volume decreasing
continuously towards the casing outlet, any sec
tion located next to the ‘casing outlet having a
smaller exterior thread diameter at its inlet end
than its neighboring co-axial section has at its 45
outlet end located next to the casing inlet of each
From Fig. 4 it is evident that both screw sec
tions 205 and 208 are made with a variable pitch.
Inorder that the total screw length in this case _ pair ,of neighboring co-axial sections under con
be not ‘too great, a tapered transition portion ‘2 l0 sideration, ‘said sections being joined together‘
inserted in a similar manner as seen in thej?rst through an intermediate tapered transition por
tion of short axial length to conduct the mass
50 embodiment. ' Without such a transition portion
the pitch oi’ the section 206 would be excessively from one screw section to the next screw section.
45
great, so that the length of this section would be
unproportional as compared with the length of
the pressing section proper 208.‘
55
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so:
v 3. A screw press, comprising a press casing, two
longitudinal screws so‘arranged rotatably side
by side therein that their threads intermesh with
According to Fig. 3, the core diameter of the
portion Ill at one side of the transition portion
H0 is slightly tapered next to the outlet, whereby
a less perfect engagement is obtained in the
each other, aninlet at one casing end and an out 55
let, at'the other one, each screw being made of at
least two sections on the same axial line, each
with a thread volume decreasing continuously
neighborhood of the transition portion, but
towards the casing outlet, any section located
simultaneously a very small length is obtained, , next to the casing’ outlet having a smaller ex
particularly as regards the screw section “it.
Fig. 5 shows an- example, wherein the transi
60
terior thread diameter at its inlet end‘ than its
neighboring co-axial section has at its outlet end
tion' portion 3 I 0 beginning at the transverse plane located next to the casing inlet of each pair of
a-and ending at the plane 1)‘ has throughout its “neighboring co-axial sections under considera
length the same thread volume as that ‘of section tion, said sections being joined together through 65
I" at-plane a and that of section 306 at plane b. an intermediate tapered transition portion of
In this case the thread pitch is increasing from short axial length, provided with threads with a
constant threadvolume throughout its length to
.
It isobvious
that, is‘ case of -specially long conduct‘ the mass from one screw section to the
~atob.
70' pressing screws. it is advantageous to divide the
screws into more than two sections behind each
other with several intermediate tapered transi
next screw section.
1
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4. A screw press, comprising a press casing. a
w
plurality of longitudinal screws arranged rotat
tion portions similar to- Ill, whereby a very small 1 ably side by side'therein so that their threads
total length of the pressing screws vas compared ' intermesh with each other,- an inlet at'one casing
‘
end and an outlet at the other one, each screw 75
75 with the pressing action is obtained.
3
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being made of at least two sections on the same pair of neighboring co-axial screw sections under
axial line, each with a thread volume decreasing a, consideration being joined together ‘through an
continuously towards’the casing outlet, any sec ' intermediate tapered transition portion of short
tion located next to the casing outlet having a axial length to conduct the mass from one screw ‘
smaller exterior thread diameter at its inlet end section to the next screw section.
,
.
than its neighboring ‘co-axial section has at its
7. A screw press, comprising a press casing, two
outlet end located next 'to the casing inlet 'of longitudinal screws so arranged rotatably therein '
‘ each pair of neighboring co-axial sections under
side bylside that their threads intermesh“ with _
consideration,~said sections being joined together » each other, an inlet-at one casing end and an ‘
10 through an intermediate tapered transition por
outlet at the other end, each screw being made of 10
tion of short axial length, provided with threads at least two co-axial sections on the same axial
, with a constant thread volume throughout its line, each with a constant exterior thread diam
length to conduct the vmass from one section to ‘ eter throughout the length of the section and with
a thread volume decreasing continuously towards
the next screw section.
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5. ,A screw press, comprising a press casing, two the casingoutlet, any section located next‘to the 15
15
longitudinal screws so arranged rotatably side
by side therein that theirthreads intermesh with
each other, an inlet'at one casing end and an
outlet at the other end, each screw being'made of
at least two co-axial sections on the same axial
line, each with a constant exterior thread diam
eter throughout the length of the section and ,
casing outlet having a smaller exteriorthread
diameter at its inlet end than thatloi' its neigh
boring co-axial section located next to the cas
ing inlet at its outlet'end, each pair of neighbor
ing co-axial sections under consideration being
joined together through an intermediate tapered
transition portion of'short axial length provided
with a thread volume decreasing continuously
towards the casing outlet, any section located
throughout its length to conduct the mass from
next to the casing outlet having a smaller ex
terior ‘thread diameter at its inlet end than that
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with threads with a constant thread volume
one screw section to the next screw section.
8. A screw press, comprising a- press casing, a
of its neighboring co-axial section located next ' plurality of longitudinal screws arranged rotat
to the casing inlet at its outlet end, each pair, of ably therein side by side so that their threads in
neighboring co-axial screw sections under con
termesh with each other,'an_inlet at one casing
30 sideration being joined together through an in-'
termediate tapered transition portion of short ax
lial'length to conduct the mass from one screw
section to the next screw section.
' l 6. A screw press, comprising a press casing, a
35 ‘plurality of longitudinal screws arranged rotat
ably side by side therein so that their threads 'in
termesh with each other, an inlet atone casing .'
end and an outlet at the other end, each screw
being made of at least two co-axial sections on
the same axial line, each with a constant exterior
thread diameter throughout ‘the’length of the
section and with a thread volume decreasing con- ‘
end and an outlet at the other end, each screw
being made of at least two co-axial sections on
the same axial line, each with a constant exterior
thread diameter throughout the length of the
section and with a thread ‘volume decreasing
continuously towards the casing-outlet, any sec
tion located next to the casing outlet having a
smaller exterior thread diameter at its inlet end
than that of its neighboring co-axial section lo
cated next to the casing inlet at its outlet end,
each pair of neighboring co-axiel sections under
consideration being joined together through ‘an
intermediate tapered transition portion of short
tinuously towards the casing outlet, any section axial lengthfprovided with threads with a conlocatednext to the casing outlet having a smaller stant. thread volume throughout" its length to
‘ ' 45.:exterior thread diameter at its inlet end ‘than’ conduct the mass from one screw section to the
that'of its neighboring loo-axial section located
next screw section.
next to the casing inlet at its outlet end, each
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HANS'ANDREAS HAR'I'NER.
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