Improved Process for Producing Stiffening Ribs in Sheet Metal Vessels or Receptacles.
Year: 1891

page_text: Date of Application, 26th Nov., 1891
Complete Specification Left, 16th Aug., 1892-Accepted, 24th Sept., 1892
PROVISIONAL SPECIFICATION.
Improved Process for Producing Stiffening Ribs in Sheet Metal
Vessels or Receptacles.
I, MAX HULLENMÜLLER, Manager, residing at Oberhausen in the Kingdom of
Prussia, German Empire do hereby declare the nature of this invention, to be as
follows:-
The methods up till now in use of stiffening or strengthening the sides and
bottoms of pressed sheet metal vessels and receptacles consist mainly in attaching
exterior rings or hoops to the same in the case of interior pressure, or in providing
the same with interior ribs or rings against exterior pressure.
All these methods however entail weakening the sides or bottom of such vessels
and give rise to leaks in the same in as far as it is necessary to bore holes in the said
vessels for rivetting on such stiffening devices.
The object of the present invention is to provide means for stiffening or strength-
ening the sides and bottoms of the kinds of vessels above mentioned and at the
same time to obviate the necessity of boring and thus to a certain extent weakening
the same.
In order to accomplish this I make the receptacles of sheet metal
varying in thickness at different points and then press or stamp strengthening ribs
or indentations in the said vessels whilst in a warm state by means of certain
moulds and dies hereinafter more particularly alluded to.
For the purposes of my invention I employ a mould corresponding to the
configuration of the sides of the vessel to be pressed, in which is arranged to slide
vertically a die or matrice of the shape required for the bottom of the vessel and
provided with embossed ribs corresponding in shape & direction to the stiffening
ribs to be produced on the bottom of the vessel. An upper die having depressions
or indentations to match the embossments of the lower or bed die is adapted to be
pressed down into the mould and against the matrice by suitable mechanical or
hydraulic means. The warm sheet metal from which the receptacle is to be made,
and which is thicker at such parts where the strengthening ribs are to be produced,
is now laid on the top of the mould and the upper die caused to descend thus
pressing into form the sides and bottom of the receptacle. The matrice which may
be actuated by mechanical or hydraulic contrivances is now raised and stamps the
strengthening ribs into the bottom of the receptacle.
In
When it is desired to provide the sides of the receptacle with strengthening ribs,
one or more horizontal groove or grooves are made in the side of the mould and the
upper die is provided with a slot running round it & corresponding in position to
the groove in the side of the mould, when the said die is down in the latter.
this groove ring segments are loosely arranged, the interior surfaces of which
project into a circular or other shaped slot communicating with the upper surface
of the die. A circular stamp, which is advantageously arranged to slide on the
spindle of the die fits with its lower rim, which is made conical, into the said
circular or other shaped slot. After the receptacle has been pressed by lowering
the upper die and raising the lower one, the stamping ring is pressed down into its
groove or slot whereby its wedged or tapered lower rim drives the segments
horizontally outwards pressing the metal into the grooves at the side of the mould
which is in this case made in a suitable number of parts but if the sides of the
receptacle are sufficiently slanting the mould may be in one piece.
These lateral stiffening ribs may also be produced by bringing a suitable pressure
ring to bear on the edges of the sheet metal after the receptacle has been pressed,
and making the upper die full, when the vertical downward pressure on the sides
of the receptacle will force the metal into the lateral groove of the mould.

page_text: It is obvious that I can produce the ribs in the bottoms of receptacles by
providing the lower die or matrice with depressions or indentations and embossing
the under surface of the upper dic, without departing from the nature of my
invention.
Dated the 26th day of November 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Process for Producing Stiffening Ribs in Sheet Metal
Vessels or Receptacles.
1, MAX HULLENMÜLLER, Manager, residing at Oberhausen in the Kingdom of
Prussia, do hereby declare the nature of this invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and
by the following statement :-
The methods up till now in use of stiffening or strengthening the sides and
bottoms of pressed sheet-metal vessels and receptacles consist mainly in attaching
exterior rings or hoops to the same in the case of interior pressure, or in providing
the same with interior ribs or rings against exterior pressure.
All these methods however entail weakening the sides or bottoms of such vessels
and give rise to leaks in the same in so far as it is necessary to bore holes in the
said vessels for the rivetting of such stiffening devices.
The object of the present invention is to provide means for stiffening or strength-
ening the sides and bottoms of the kinds of vessels above mentioned and at the
same time to obviate the necessity of boring and thus to a certain extent weakening
the same. In order to accomplish this I make the receptacles of sheet metal varying
in thickness at different points and then press or stamp strengthening ribs or
indentations in the said vessels at these parts whilst in a warm state by means of
certain moulds and dies hereinafter more particularly alluded to.
In the annexed drawing
Fig. 1 is a section through an apparatus such as I use for the purpose of my
invention, consisting of a mould corresponding to the configuration of the sides of the
vessel or receptacle to be pressed, in which is arranged to slide vertically a bed-die or
matrice of the shape required for the bottom of the vessel and provided with
embossed ribs a corresponding in shape and direction to the stiffening ribs to be
produced on the bottom of said vessel. An upper die e having depressions or
indentations to match the embossments a of the lower or bed-dic is adapted to
be pressed down into the mould and against the matrice by suitable mechanical or
hydraulic means. The warm sheet metal from which the receptacle is to be
made, and which is thicker at such parts where the strengthening ribs are to be
produced is laid on the top of the mould d and the upper die descending presses this
sheet into a receptacle forming at once the sides and bottom. The matrice f which
may be actuated by mechanical or hydraulical contrivances is then raised, stamping
into the metal the strengthening ribs at the bottom of the vessel.
Fig. 2 is a section through an apparatus adapted for stamping boats and their
keels in one piece and in one operation. In this case the matrice is provided with
a depression b, and the upper die e with an embossment a. Vertical depressions
and embossments provided on the sides of the mould form ribs on the sides of
the boat.
When it is desired to provide the sides of the receptacles with strengthening
ribs, one or more horizontal grooves n (Fig. 3 & 4) are made in the side of the
mould d and the upper die e is provided with slots running round it, and corre-
sponding in position to the grooves n in the sides of the mould, when the said die is
down in the latter. In these slots, ring segments are loosely arranged, the interior
surfaces of which, h', project into a circular or other shaped groove i cut in the
h

page_text: upper surface of the die c. A circular stamp k, which is advantageously arranged
to slide on the spindle of the die fits with its lower rim, which is made tapered, into
the said circular or other shaped groove i.
After the receptacle has been pressed from the sheet metal by lowering the upper
die and raising the lower one, the stamping ring k is pressed down into the groove i,
whereby its wedged or tapered lower rim drives the segments horizontally
outwards pressing the metal into the grooves n at the sides of the mould d.
These lateral stiffening ribs may also be produced by bringing a suitable pressure
ring c (see Fig. 5 & 7) to bear on the edges of the sheet metal after the receptacle
has been pressed and making the upper die e full, when the vertical downward
pressure on the edges of the receptacle will force the metal into the lateral grooves n
of the mould, thus forming a rib as at p Fig. 6.
It is obvious that I can produce the ribs in the bottoms of the receptacles by
providing the lower die or matrice with depressions or indentations and embossing
the under surface of the upper die e.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is.
The method of producing strengthening ribs in the sides and bottoms of vessels
or receptacles substantially as herein described with reference to the accompanying
drawing.
The LAT AAW A
A DOHRE 1X4
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.