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Патент USA US2129774

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Sept. 13, 1938.
O. KUHNER
2,129,774
DRAW PRESS
Filed May 20, 1936
14
12
11
\6
2 Sheets-Sheet l
Sept. 13, 1938.
o. KUHNER
2,129,774
DRAW PRESS
Filed May 20, 1936
2 Sheets-Sheet 2
3'0313‘5 5:4.
BY
%
HTT'O’QIVEY
2,129,774
Patented Sept. 13, 1938
' UNITED STATES
PATENT OFFICE
2,129,774
DRAW PRESS
Otto Kiihner, Goppingen, Germany
Application May 20, 1936, Serial No. 80,798
10 Claims. (Cl. 153-48)
ner. The bolts are guided in slots in the blocks,
This invention relates to improvements in hy
draulic draw presses which are used for the pro
duction of hollow bodies from sheet metal plates.
In such presses the plates or sheets are clamped
5 over a table adapted to be moved hydraulically.
On the table is secured the pattern, for example
a wooden pattern necessary for the production
of the hollow body. By movement of the table
against the clamped metal sheet the pattern
10 is forced into it.
With patterns which do not have a simple
form but show, for example, a plurality of
which themselves lie on the base plate either ad
justable in plane surfaces or swingable in' cylin
drical surfaces.
The adjustability of the table is attained in a
simple way‘by supporting it at at least three
points and connecting the table by ball and socket
joint with a hydraulically operated ram. The
table can, however, also be moved by carrying it
on two or more independently'operating hydrau
During the process the portions at which greater
lic pistons. Thus, if the centres of the pistons lie
in one plane, a swinging movement about paral
lel axes is possible. With other arrangements of
the piston centres, the table can ‘be adjusted
still further. The table can be adjusted in any
desired direction, if it is adjustably supported at
at least three points, and a ram carried by two
stretching occurs conform to the pattern more
or more pistons serves as the supporting device.
curves or any other unusual form, it is not pos
sible to clamp the sheet so that‘ it bears through
15 out on the pattern. The drawing process does
not then begin uniformly over the whole pattern.
strongly and sharply than the portions subjected
to lesser stretching. Moreover, these differences
have to be equalized and it is necessary ?rst to
work the portions of lesser stretching, for ex
This arrangement offers a‘ possibility f double
adjustment for firstly the ram can be adjusted
as desired and on the other hand the table, which
- ample the ?at portions, and then, by adjustment
is supported against the ram, is adjustable in any
direction relatively to the latter.
of the form, the portions subjected to greater
clamping. Formerly this was e?ected by the
trated in the accompanying drawings by way f
interposing of liners between the table and the
pattern, this necessitating a very correct work
ing of the liners.
' The invention consists essentially in that the
30 table is arranged movable in space and ?xable
10
Some embodiments of the invention are ' lus
example, in which:
'
Fig. 1.is an elevation of a draw press.
Fig. 2 is a plan view thereof.
Fig. 3 is a side elevation of Fig. 1.
Fig.4 is a part sectional elevation of a modi?ed 30
a
and that the clamping device consists of blocks form of table.
mutually adjustable individually or in groups, ' Figs. 5 and 6 are an elevation and plan view
which blockscare arranged either on opposite respectively of a clamping device in accordance
with the invention, and
_ sides onlyv or on all sides of the table. With such
Fig. '7 is an elevation of a modi?ed form of 35
a construction of press the pattern can be ‘
'
brought to any desired position by adjustment of ' clamping device.
In the draw press according to Figs. 1.—3, two
the table without special liners being necessary.
In this way the use of such presses is simpli?ed base plates 2 and 3 rest on three supports I. The
base plates 2 and 3 are relatively adjustable and
and the possibility of their use extended.
in the direction of the transverse axis of
'40 Moreover, the construction of the clamping ?xable
a plate 4 and carry along their sides the clamp
device according to the invention serves to over
come the difficulties which arise during drawing ing blocks 5 and 6, which, shown diagrammati
with complicated patterns. For example, the cally only in Fig. 2. are adjustable on the base
new construction of clamping device enables plates 2 and 3 in' grooves ‘I and B respectively;
45 clamping of the sheet to be obtained along any . The plate 4 is carried by a piston 9 which recip
desired form of curve. Re-clamping, that is to rocates in a cylinder l0 under the action of
say a second working process, or patterns with water pressure in known manner. The plate 4 is,
moreover, formed with a ball seat in which a ball
exchangeable parts are no longer, necessary.
I I rests. ‘The latter is secured to the actual press
.The constructional form of the clamping de
vice and the table according to the invention table [2 on which the pattern l3 rests. The table
l2, moreover, is supported against the plate 4 by
may be as desired, but the following more fully
described forms are particularly advantageous. ‘three adjustable bolts I 4. In Fig. 1 the press is _
Each section or block of the clamping device is illustrated, with the vtable [2 not adjusted, at
secured by one or more bolts to the base plate, the end of a working stroke, the stretched work
piece l5 being omitted. The latter is shown in 55
which is likewise adjustable in a known man
2
2,129,774
Fig. 3 from which, for the sake of clearness,
» the clamping blocks 6 have been omitted.
At
the commencement of the working operation the
metal sheet is clamped in the bloclns 5, whereupon
the piston 9, plate 4, table 12 and pattern l3 are
forced upwardly against the workpiece I5, which
takes the form of the pattern I3. In Fig. 2 the
blocks 5 are relatively displaced and likewise the
blocks 6 can take a di?erent relative position.
The arrangement of these blocks 6 enables the
workpiece to be clamped not only at opposite
‘sides but on all sides, or to be held only by means
of the blocks 6 without, as was formerly necessary,
the table l2 having to be turned through 90° and
15 the base plates 2 and 3 separated from one an
other.
'
The draw press according to Fig. 4 employs the
same clamping devices as‘that according to Figs.
1 to 3, but the table I6 is adjustable in a different
face; and means for holding said upper part in
engagement with said under part.
2. In a hydraulic drawpress of the type re
ferred to, the sub-combination of: a base; a press
table movable relatively to said base; means for
tilting said press table, said means comprising
means for adjustably supporting saidtable at at
least three points; and clamping devices for a
sheet to be treated, disposed around said table
on said base.
10
3. In a‘ hydraulic draw press of the type re
ferred to, the sub-combination of : a base; clamp
ing devices on said base; a press table; means for
tilting said press table, said means comprising ad
justable supports for said table; a ball carried by 15
said table; a second table supporting said press
table by means of said supports and said ball;
and means for operating said second table.
‘
4‘. In a hydraulic draw press of the type re
ferred to, the sub-combination of : a base; a press 20
three bearings l1, l8 and IS, the bearing l8 be
table; means for tilting said press table, said
ing connected to a slide block 20, which is guided . means comprising a cylinder carried by said base
in the straight guide 2| carried by supports 22. adjacent each end of said table and a piston mov
On the latter and also on supports 23 rest cylin
able in each of said cylinders for moving said
25 ders 24 in which pistons 25 slide under the action
table.
25
of water pressure, the said pistons carrying dove
5. In a hydraulic draw press of the type re
tail-like bearings 26 in which slide members 21 ferred to, the combination of: a- base; a press
carrying the bearings l1 and IS. The piston 25 table; means for tilting said table, said means
is or both pistons are lifted for adjusting the table comprising adjustable supports for said table, a
I6. During the actual drawing operation the ball carried by said table, a cylinder; and a piston
table is pressed against the clamped sheet blank in said cylinder, said piston having a bearing sur 30
by further raising of one or both pistons. Also in face adapted to support said ball; hydraulic means
this case a pattern, not shown in Fig. 4, is secured for actuating said piston to move said table; a
to the table IS.
clamping devices for a sheet to be treated, said
35
The two embodiments of the clamping device devices comprising a plurality of blocks secured to
shown in Figs. 5-7 can be used in the presses said base, said blocks each comprising an under 35
manner. The said table is pivotally mounted on
according to Figs. 1-3 and 4. The clamping de
vice according to Figs. 5 and 6 rests on the base
plate and is moved thereon for the purposes of
40
adjustment, whilst the clamping device accord
ing to Fig. 7 is guided, that is to say is swingable
in a cylindrical surface.
'
The arrangements according to Figs. 5 and 6
consist of a block 28 on which are arranged two
eyes 29 having slots 30 therein in which are guided
the bolts 3| for securing the block 28. The edge
of the sheet to be treated is clamped between a
swingable plate 32 and a projection 33 of the
block 28. The pivot pins 34 of the plate 32 rest
in plates 35. The plate 32 is adjustable by means
of a lever 36 ?xed to the plate 32 and movable
in a slot 31 of the block 28. Raising the lever
opens the clamping device and depressing closes
it.
This arrangement can also be secured in a
simpli?ed construction with only one bolt 3|.
The clamping device shown in Fig. ‘7 besides be
ing adjustable on the base plate 38 is swingable
in the cylindrical surface 39. The under part
40 is held against the base plate 38 by a bolt 4|,
60 whilst the upper part 42 is held by a bolt 45
swingable at 43 in the under part 40 and carried
in the upper part 42 by a ball joint 44. The actual
clamping device, viz. projection 46 and plate 41
are formed the same as in the arrangement ac
65 cording to Figs. 5 and 6.
part having an upper concave surface, and an
upper part having a convex surface movable over
said concave surface; and means for holding said
upper part in engagement with said under part.
40
6. In a hydraulic draw press of the type re
ferred to, the combination ‘of: a base; a press
table; means for tilting said table, said means
comprising adjustable supports for said table: a
ball carried by said table, a cylinder, a piston in
said cylinder, said piston having a bearing sur
face adapted to support said ball; and hydraulic
means for actuating said piston to tiltsaid table;
and clamping devices for a sheet to be treated
disposed around said table.
7. In a hydraulic draw press of the type re
ferred to, the sub-combination of: a base; a press
table movable relatively to said base; means for
tilting said press table; and a plurality of clamp
ing devices for a sheet to be treated upon said
base, disposed on each side of said table, each of
said clamp devices being adjustable and secur
able independently of each other of said devices,
whereby said sheet may be clamped on opposite
sides or on all sides of said table.
60
8. In a hydraulic draw press of the type re—
ferred to, the sub-combination of :' a base; a press
table; a centrally disposed pivot bearing for said
table; means for tilting said press table, said
1. In a hydraulic draw press of thetype re
ferred to, the sub-combination of t a base; a press
table movable relatively to said base; means for
means comprising a cylinder carried by said base
adjacent each end of said table and a piston mov
able in each of said cylinders to?tilt said table.
9. In a hydraulic press of the type referred to,
tilting said press table and clamping devices for
the sub-combination of a base; a press table; a
I claim:
’
.
a sheet to be treated, said devices comprising a
plurality of blocks secured to said base, said
blocks each comprising an under part having an
upper concave surface, and an upper part having
75 a convex surface movable over said concave sur
centrally disposed pivot bearing for said table; 70
and means for tilting said press table, said means
comprising a cylinder carried by said base ad
jacent each end of'said table, a’piston‘movable
in each of said cylinders and means for moving‘
9,129,774
said pistons independently of one another to tilt
the said tableas required.
I
10. In a hydraulic press for the production of
hollow bodies from sheet metal plates, the sub
combination of: a base; a press table disposed
above said base; and said table being movable rel
atively to said base; a pattern necessary for the
\
,
3
production 0!.’ the hoilombody carried on the up
per face of said table remote from said base and
over which a sheet to be treated is stretched;
clamping devices for said sheet disposed around
said table on said base; and means for tilting said 5 _
press table and pattern.
A
,
_
‘
o'rro KtiHNER.
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