baber/WOPTO huggingface dataset:
Patent EP-0170953-A3 (EP)
IPC: B29C43/44
Filed: 1985-07-19
Abstract: In kontinuierlich arbeitenden Vulkanisierpressen wird das 
durchlaufende Preßgut an beiden Seiten zwischen mitlaufen­
den biegsamen Beilagestreifen geführt. Erfindungsgemäß sind 
im Einlaufbereich der Presse auf die Beilagestreifen einwir­
kende Andrückvorrichtungen vorgesehen, um den unmittelba­
ren Kontakt der Streifen mit den Seitenkanten des Preßgutes 
schon in der Anfangsphase der Vukanisationsbehandlung 
herzustellen. Im Vergleich zu der bekannten Anordnung mit 
Abstand vor der Presse ergibt sich hieraus eine wesentlich ge­
nauere Führung der Beilagestreifen und damit auch eine quali­
tative Verbesserung des Enderzeugnisses.
Patent EP-0178679-A3 (EP)
IPC: D04H1/655
Filed: 1985-10-18
Abstract: Zur Heftung einer insbesondere bindemittelfreien Mine­
ralfasermatte (7) werden Heftpunkte dadurch erzeugt, daß 
die Fasern (3) in ihrer gegenseitigen Lage im Heftbereich 
durch gegenseitige Verschweißung oder Verklebung fixiert 
werden. Eine Verschweißung kann mittels Laserstrahlen, 
Heißluftstrahlen oder Flammstrahlen erfolgen. Bei einer 
Verklebung werden Heftpunkte in Form von Stiften (6) 
dadurch erzeugt, daß ein fließfähiger, verfestigbarer Stoff in 
Form eines kompakten feinen Strahles in die niedergedrück­
te Wollebahn (1) eingeschossen und in der eingeschossenen 
Stellung verfestigt wird. Hierdurch werden die Enden der 
Fasern (3) im ausgehärteten Material des Stiftes (6) verklebt 
und so in der kompaktierten Stellung lagegesichert. Es ergibt 
sich ein matratzenartiges Aussehen der Mineralfasermatte 
(7). Bei Bedarf kann das Material zur Bildung des Stiftes (6) 
anorganisch auf der Basis von Wasserglas oder Kieselsol 
sein. Auf diese Weise können mit hoher Geschwindigkeit 
Heftpunkte im Zuge der Produktion der Wollebahn (1) 
erzeugt werden, und so ohne Verlust an Produktionsge­
schwindigkeit eine an insbesondere organischem Bindemit­
tel freie Mineralfasermatte (7) geschaffen werden. Bei Bedarf 
kann in den Stiften (6) zusätzlich ein Heftfaden (8) verankert 
werden, der mit eingeschossen wird.
Patent EP-0179430-A3 (EP)
Title: Aqueous pharmaceutical formulations of piroxicam monohydrate
IPC: A61K31/54
Filed: 1985-10-21
Abstract: Aqueous pharmaceutical compositions, containing as the active ingredient N-(2-pyridyl)-2-methyl-4-hydroxy-2H- 1,2-benzothiazine-3-carboxamide 1,1-dioxyde in the monohydrated form. 
<??>The compositions of the invention are stable and do not undergo to crystal growth phenomena.
Patent EP-0178701-A3 (EP)
IPC: G01G23/01
Filed: 1985-09-16
Abstract: Scales of the type comprised of a base carrying a 
weighing platform, a lever system with a weighing spring 
being interposed between said base and said platform, 
wherein the lower end of said spring is flattened and urges 
against said base, and the upper end of said spring is 
threaded through a cover, said lever system being tied to 
said cover so that said spring can be calibrated by screwing 
more or less said spring through said cover.
Patent EP-0162705-A3 (EP)
Title: Injection of nicardipine hydrochloride and production thereof
IPC: A61K31/44
Filed: 1985-05-21
Abstract: This invention provides an injection of nicardipine hydrochloride comprising an aqueous nicardipine hydrochloride solution containing 2 to 7 w/v % of polyhydric alcohol and having a pH of 2.5 to 5.5.
Patent EP-0182508-A3 (EP)
IPC: H01S5/12
Filed: 1985-10-22
Abstract: A semiconductor laser device for laser oscillation at a 
wavelength in the range of 660 nm to 890 nm comprising an 
active layer (3, 14) consisting of Ga 1-x Al x As (0≦x≦0.4) or 
In 1-y Ga y P 1-z As z  (0.51≦y≦1, 0≦z≦1, and z=2.04y-1.04) 
and a layer (4, 13 with a diffraction grating (44, 33) thereon 
consisting of In 1-y Ga y P 1-z As (z=2.04y-1.04) which is adja­
cent to said active layer (3, 14).
Patent EP-0189105-A3 (EP)
Title: Output compartment for a voucher processing device
IPC: G06K13/08
Filed: 1986-01-15
Abstract: In a document processing facility whose operation is initiated by user-associated authorization cards which can be plugged into a badge reader, a deposit stacker which is not accessible from the outside is provided below the output stacker. A document seating surface is provided in this output stacker, this document seating surface being movable by a drive device back and forth between a document output position and a deposit position, whereby, in the deposit position, an opening in the deposit stacker is exposed, the documents falling into the deposit stacker after being released by braking elements provided in the output stacker.
Patent EP-0204953-A3 (EP)
IPC: C08F6/06
Filed: 1986-05-05
Abstract: A process is provided for reducing the free acrylonitrile 
monomer content of an aqueous medium containing the 
monomer, the process comprising adding a hydroxylamine 
to the medium in an amount less than the stoichiometric 
equivalent of the free acrylonitrile monomer present in the 
medium.
Patent EP-0205099-A3 (EP)
IPC: B25B23/04
Filed: 1986-06-05
Abstract: There is disclosed an automatic fastener driving system 
suitable for robotic applications utilizing a modified fastener 
driving means having a unique detection means (111, 112) in 
the head (99) of the driving means working in combination 
with a pneumatically operated advance and retract means, 
and control circuitry, to detect when a fastener (104) is present 
in the driving means, to advance and drive the fastener (104) 
into the workpiece (134), and to then automatically retract 
therefrom.
Patent EP-0217120-A3 (EP)
Title: Echo canceller circuitry
IPC: H03M1/00
Filed: 1986-08-25
Abstract: It contains a network of capacitors, the capacitance of which is graded in a binary manner and the one terminals of which, which represent base points of the network, can be connected to a reference potential or, in the case of low-significance bits of digital information items to be converted, to earth potential or to a fraction (UB, U4) of the reference potential. To avoid problems which could arise from the offset voltage of an integrated operational amplifier (V) connected to the network, the network is constructed of two symmetrical halves (C0o' to C32o; C0n' to 32n). 
<IMAGE>
Patent EP-0218987-A3 (EP)
IPC: E02D5/80
Filed: 1986-10-01
Abstract: Um ein Einbauteil, z.B. einen Ankerstab (10) für einen 
Verpreßanker, durch eine Spundwand (1) in eine Bodenformation 
(14) mit drückendem Wasser (3) einbringen zu können, wird 
zunächst im Boden hinter der Spundwand ein Dichtpfropfen (2) 
aus injiziertem erhärtendem Material hergestellt. 
Anschließend wird in der Spundwand (1) eine Einrichtung mit 
einer ersten Dichtung (6) angebracht, durch die ein 
Vortreibrohr (8) mit wasserdichter, verlorener Spitze (9) 
eingetrieben wird. In das Vortreibrohr (8) wird ein Ankerstab 
(10) eingeführt. Eine zweite Dichtung (12) zwischen 
Vortreibrohr (8) und Ankerstab (10) verhindert das Austreten 
von drückendem Wasser (3). Beim Ziehen des Vortreibrohrs (8) 
wird der dabei entstehende Hohlraum über eine Verpreßleitung 
(13) mit erhärtendem Material verpreßt, das einen 
Verpreßkörper (17) bildet. Dabei wirkt der Verschlußpfropfen 
(2) als dritte Dichtung gegen das drückende Wasser (3).
Patent EP-0218247-A3 (EP)
IPC: C11D3/28
Filed: 1986-10-08
Abstract: Flüssige Waschmittel, die als wesentliche Bestandteile 
einen Diarylpyrazolinaufheller sowie ein nichtionisches 
und kationisches Tensid enthalten, ergeben im einstufigen 
Behandlungsbad ausgezeichnete Aufhelleffekte und einen 
angenehmen Griff der Ware. Sie sind in dieser Hinsicht 
herkömmlichem Waschmitteln auf der Basis anionischer Auf­
heller und Tenside weit überlegen.
Patent EP-0226904-A3 (EP)
IPC: H01H13/702
Filed: 1986-12-04
Abstract: Eine wesentliche Verbilligung bei der Herstellung von Schal­
tungsplatten, insbesondere für Tastenwahlblöcke, wird dadurch 
erreicht, daß sowohl die Schaltungsträgerplatte als auch das 
an ihr vorzusehende Leitermuster und auch Anschlußbereiche 
zu mehradrigen Kabeln jeweils als Spritzgußgebilde herge­
stellt werden.
Patent EP-0227049-A3 (EP)
IPC: B65D83/14
Filed: 1986-12-18
Abstract: A single stage aerosol pressurization grom­
met (10) and a container having such a grommet to pressurize 
the container, said grommet (10) comprising a head portion (12) 
adapted to be inserted into a filling aperture (28), a base 
portion (16), a neck portion (14) interconnecting the head (12) and 
base (16) and a deflection indent passing through the base 
and neck. The base (16) is equipped with at least one 
filling channel (18) and the head (12) is equipped with shoulders (22) 
to resist removal from the aperture. During filling 
the pressurized contents from the filler cause the de­
flection indent to deform the grommet (10), thereby allowing 
contents to pass through the filling channel (18) into the 
container and when filled the filler is removed and the 
pressure inside the can causes the shoulders to meet the 
edge of the aperture and seal the contents in the con­
tainer.
Patent EP-0222512-A3 (EP)
Title: Malonate compounds useful as light stabilizers for plastics
IPC: C08G63/685
Filed: 1986-10-10
Abstract: Malonate-based spiroacetals of polyalkylpiperidin-4-ones are useful light stabilizers for synthetic polymer resins such as polyolefins, and in particular, polypropylene.
Patent EP-0229643-A3 (EP)
IPC: F02P3/045
Filed: 1987-01-09
Abstract: Ein Zündsystem für einen Verbrennungsmotor mit fol­
gemdem Aufbau: ein Impulsgeber erzeugt synchron mit der 
Kurbelwellendrehung Winkelimpulse und einen Bezugs­
impuls; zur Bestimmung eines Drehzahlwertes werden Takti­
mpulse während einer Zeitbasis in einem Drehzahlzähler 
gezählt; entsprechend dem Drehzahlwert und einem digital­
isierten Lastwert wird ein Festwerte speichernder Kenn­
feldspeicher abgefragt; in Abhängigkeit von den Speicher­
werten des Kennfeldspeichers wird ein Zündzähler 
voreingestellt, der durch Zählung von Winkelimpulsen einen 
Schaltimpuls für das Zündsignal abgibt; der Drehzahlwert 
und der Lastwert werden am Ende der Zeitbasis in Zwischen­
speichern gespeichert; der Kennfeldspeicher enthält Mehrbi­
tzündwerte zur Festlegung des Zündwinkels; zu einem vor­
gegebenen Winkelwert wird der voreinstellbare Zündzähler 
mit dem jeweiligen Mehrbitzündwert vorgeladen. Das tech­
nische Problem ist die Bereitstellung eines Zündsystems, das 
eine hohe Auswertegeschwindigkeit hat, so daß innerhalb 
der zur Verfügung stehenden Zeiten auch bei hohen Drehza­
hlen eine sichere Bestimmung des Zündwertes unter Ber­
ücksichtigung der erforderlichen Korrekturgrößen möglich 
ist. Die Winkelimpulse werden als Taktimpulse verwendet. 
Eine ebenfalls Festwerte speichernder Korrekturfeldspeicher 
enthält Mehrbitkorrekturwerte in Temperatur/Last/­
Drehzahlkennfeldern und/oder Oktan/Lastkennfeldern. Währ­
end eines anschließenden Korrekturwinkelabschnitts wird 
der Zählstand des Zündzählers durch die Mehrbitkor­
rekturwerte additiv oder subtraktiv korrigiert. Bei einem vor­
gegebenen Winkelwert wird der Zündzähler freigegeben, die 
Winkelimpulse werden bis zum Überlauf gezählt und der 
Überlaufimpuls löst als Schaltimpuls die Zündung aus.
Patent EP-0263913-A3 (EP)
IPC: H01L21/673
Filed: 1987-04-10
Abstract: Es ist eine Vertikalhorde aus Quarzglas für die hori­
zontale Lagerung von runden, quadratischen oder rech­
teckigen Substratscheiben mit konstanter Dicke mit min­
destens zwei sich vertikal erstreckenden an einer Grundplatte 
angeordneten Profilstäben, die parallel zu der Vertikalachse 
der Horde verlaufen und in etwa horizontale Schlitze zur 
Aufnahme der Scheiben aufweisen, bekannt, wobei die min­
destens zwei Profilstäbe derart angeordnet sind, daß sie den 
gleichen Abstand von der Vertikalachse haben. Um eine Ver­
tikalhorde der genannten Art so auszugestalten, daß eine De­
formation der Horden während des Einsatzes nicht auftritt, 
sind die mindestens zwei Profilstäbe symmetrisch zu zwei 
senkrecht aufeinanderstehenden Ebenen, deren Schnittlinie 
mit der Vertikalachse zusammenfällt, angeordnet.
Patent EP-0244756-A3 (EP)
IPC: H04M11/00
Filed: 1987-04-29
Abstract: A communication terminal apparatus includes a 
telephone circuit (32, 34) for generating a detection 
signal in response to a received calling signal in an 
automatic receiving mode, and a control unit (2l, 22, 
30) for transmitting an answer-back tone signal in re­
sponse to the detection signal from the telephone cir­
cuit (32, 34). After transmitting the answer-back tone 
signal, in response to externally supplied DTMF signals 
representing a data input start signal, key-in data, and 
a data input end signal, the control unit (2l, 22, 30) 
sequentially stores the key-in data in a memory (25) and 
drives a printer (24) on the basis of the key-in data 
stored in the memory (25).
Patent EP-0246518-A3 (EP)
IPC: C12M3/00
Filed: 1987-05-08
Abstract: Es wird eine Unterlage für Zellkulturen mit basalmem­
branähnlichen Eigenschaften beschrieben: sie ist im µm-­
Bereich dünn, ist mechanisch stabil und flexibel, weist auf 
ihrer Oberfläche Kohlenhydrate und/oder Kohlenhydratgrup­
penketten und/oder Proteine und/oder amphiphile Substan­
zen auf und ist für Ionen und Proteine permeabel.
Patent EP-0248342-A3 (EP)
IPC: H01H9/46
Filed: 1987-05-26
Abstract: A miniature circuit breaker of the kind comprising two arc 
runners (20, 22) which diverge towards an arc stack (24), onto 
which an arc is transferred as contacts of the circuit breaker 
are opened.  
     A supplementary runner (30) is provided, onto which the 
arc is transferred from the first of said runners (20), so that the 
arc extends between the second (22) and the supplementary 
runner (30). The supplementary runner (30) is connected into 
the circuit through a high impedence, so that the rate of in­
crease of arcing current is reduced as the arc travels into the 
arc stack.
Patent EP-0259704-A3 (EP)
IPC: G06F17/50
Filed: 1987-08-26
Abstract: In a procedure for synthesizing circuit designs, a SYNTHE­
SIZE command in a consequence portion of a rule can be used to 
control the creation of bit-level instances from a description of 
a more abstract instance whose interface consists of multi-bit 
signals. The synthesize command has a form that identifies 
multibit signal/part objects in the data base relative to the 
current multi-bit instance, which are then synthesized over the 
range of most-significant to least significant bit. A collection 
of rules, called macrorules are enclosed with in a 'synthesize' 
command. An iteration controlled by "current bit," ranging from 
least significant to most significant bit, ensues. At each step 
of the iteration, all macrorules are tested and applied if they 
are 'true'. The macrorules can query whether the current bit is 
a function of the least or most significant bits. The macrorules 
can also establish connectivity to any signal bit relative to the 
current, the least significant or the most significant bit. Sig­
nals which represent numeric constants, are converted to the cor­
rect binary value for each bit of the bitwise synthesis. During 
this process, new signal names with bit subscripts are generated, 
if needed, and a connections are in made so that the resulting 
data base represents an electrically connected circuit.
Patent EP-0267615-A3 (EP)
IPC: A61K39/395
Filed: 1987-11-12
Abstract: Cell surface gangliosides are presumed to play a 
role in cell growth and differentiation. Using monoclonal 
antibodies directed against G D3 , a disialoganglioside expressed 
predominantly by cells of neuroectodermal origin, we have found 
that G D3  is expressed by a subpopulation of cells of the immune 
system including: a) fetal thymocytes in subcortical regions and 
near vessels, 2) lymph node lymphocytes in interfollicular areas 
and near vessels, and 3) a small subset of T cells in the 
peripheral blood. Mouse monoclonal antibodies (two IgGs, one IgM 
and F(ab′)₂ fragments) reacting with G D3  were found to stimulate 
proliferation of T cells derived from peripheral blood. 
Proliferation induced by binding to G D3  could be augmented by 
exogenous IL-2, PMA, PHA or Protein A.
Patent EP-0278081-A3 (EP)
Title: Improvements in or relating to a paper holder
IPC: B41J29/00
Filed: 1987-12-07
Abstract: A paper holder, for holding paper for the operator of a key board, for example, consists of an elongate member (50) defining a slot (53), the slot (53) being non-linear in at least one dimension. A piece of paper may be inserted into the slotted member, the piece of paper being held in a stiff erect position.
Patent EP-0238251-A3 (EP)
IPC: G11B15/67
Filed: 1987-03-11
Abstract: There is provided a transport apparatus for receiving 
and operating upon a tape cartridge (2) including 
a web of tape (5) disposed on a supply reel (6) 
and having a free end (11) engaged by a leader 
block (10) nested within the tape cartridge. A 
take-up reel (21) transports the tape between the 
supply reel (6) and the take-up reel (21) responsive 
to a motor (19) the energy required to withdraw 
the leader block (10) from said nesting exceeding 
the energy required to transport the tape and the 
capacity of the motor (19).A leader block engaging 
assembly (23) is associated with the take-up reel 
(21) for engaging the leader block (10) of the 
tape cartridge (2) and for delivering the leader 
block from the nesting of the tape cartridge to 
the take-up reel (21). A kinetic energy device 
(24-27) is associated with the take-up reel (21) 
for delivering stored kinetic energy to the leader 
block engaging assembly to enable the leader block 
(10) to be withdrawn from the nesting.
Patent EP-0260069-A3 (EP)
IPC: F02M37/34
Filed: 1987-09-03
Abstract: A filter assembly and associated collection bowl for a 
single or dual contaminant collection zone arrangement use a 
self-sealing o-ring in combination with a threaded mating 
arrangement in order to withstand high pressure differentials. 
The filter assembly may include an end cap having a plurality of 
downwardly projecting ribs distinct from a threaded connector 
ring upon which the end cap rests or the ribs may be integral 
with the connector ring and separate from the end cap. The lower 
end of the filter housing includes a number of contaminant 
channels between adjacent pairs of the ribs, the contaminant 
channels leading to corresponding contaminant outlets.
Patent EP-0280816-A3 (EP)
Title: Surgical isolation drape
IPC: A61B46/23
Filed: 1987-12-23
Abstract: A surgical isolation drape for use in urological, gynaecological or proctorlogical surgical procedures or examination of patients comprises a sheet (10) of flexible transparent or translucent plastics material provided with adhesive strips (13, 14) and/or tapes (131, 141) for attaching the upper end of the sheet (10) to the patient's legs so that the remainder of the sheet (10) hangs down therefrom. The lower portion of the sheet (10) is formed into a funnel (30) either by seaming its edge portions (221, 231) together or by means of attachment means such as tapes (15 to 20) for joining the sides (22,23) of the lower part of the sheet (10). A central part of the sheet (10) is provided with apertures (24, 25) sealed by flexible members such as surgical gloves (26, 27) which permit passage of the surgeon's hands. For urological use, the central portion also has a sealable aperture (28) permitting ocular access to the lens of a urological instrument and a support for the lens casing, e.g. a reinforcing ring (29) and a box (34) or sheet (36) attached to the sheet (10). A self-adhesive flap (41) may also be used to protect the lens. For gynaecological use, the aperture (28) is replaced by a sealed inspection window.
Patent EP-0255496-A3 (EP)
Title: Apparatus for the semiautomatic formation of sheaths, that is covers for mattresses and the like
IPC: B68G7/05
Filed: 1987-07-24
Abstract: With the carcass of a mattress or with the aid of a template and the use of beaders, the cover or sheath is formed with transit and dwelles: on at least a loading bench (3); in at least a first beader (5), in order to bead a perimetral valance to a sheath bottom; in at least an overturning device (7); in at least a second beader; on at least a bench (12) for the unloading and possible withdrawal of template.
Patent EP-0278245-A3 (EP)
IPC: A43B5/04
Filed: 1988-01-13
Abstract: Bei einem Schischuh mit einem Außenschuh und einem Innen­
schuh wird vorgeschlagen, daß im Fersenachillessehnenbe­
reich an der Innenseite des Außenschuhs eine Einlageplatte, 
insbesondere in Form einer Sattelplatte angeordnet ist, 
welche durch eine Stelleinrichtung höhen- und/oder form­
verstellbar ist. Hierdurch soll erreicht werden, daß sich 
die Innenfläche des Außenschuhs an die Fußkrümmung im 
Fersenachillessehnenbereich individuell anpassen läßt.
Patent EP-0281134-A3 (EP)
Title: Cationically established pigment dispersion and brush paint
IPC: C09D17/00
Filed: 1988-03-03
Abstract: A cationic pigment dispersion which is suitable in particular for preparing paper-coating compositions contains  (a) a pigment component; (b) a cationised polymer which surrounds the pigment particles as a protective colloid and has been obtained from hydrophilic polyacrylates or polymethacrylates, degraded starches or degraded modified starches, methylcelluloses, hydroxymethylcelluloses, carboxymethylcelluloses, degraded alginates, proteins and/or polyvinyl alcohol and which raises the zeta potential of the dispersion containing the enrobed pigment particles to the isoelectric point or into the cationic range; (c) and optionally a cationic polymer or a quaternary ammonium compound as a dispersing agent for the colloid-enrobed and -cationised pigment particles.
Patent EP-0300215-A3 (EP)
IPC: C01G1/00
Filed: 1988-06-23
Abstract: Beschrieben wird ein Verfahren zur Herstellung eines 
duktilen Verbundwerkstoffs aus einem spröden Hochtemperatur-­
Supraleiter auf der Basis von sauerstoffdefekten Misch­
oxiden mit Perowskitstruktur. Erfindungsgemäß wird aus 
dem spröden Mischoxid feinkörniges Pulver hergestellt, das 
in ein duktiles Metall mit guter elektrischer Leitfähig­
keit und möglichst geringer Affinität zu dem Mischoxid 
eingelagert wird.
Patent EP-0298470-A3 (EP)
Title: Process for the production de components based on silicon oxycarbide
IPC: C08L83/04
Filed: 1988-07-07
Abstract: The invention relates to a process for preparing moldings based on silicon oxycarbide, which comprises reacting a molding containing from 50 to 90 percent by weight of silicon oxycarbide having an average particle size of from 0.5 to 50 um with from 10 to 50 percent by weight of a silicone resin having the general formula [(CH3SiO)x(OR)y(OH)z]n, in which R is an alkyl radical having from 1 to 4 carbon atoms, x is in the range of from 1.4 to 1.5, y is in the range of from 0 to 0.08, z is in the range of from 0 to 0.08 and n is in the range of from 20 to 40, under a nonoxidizing atmosphere or in a vacuum at temperatures in the range of from 700 DEG  to 1500 DEG  C.
Patent EP-0302320-A3 (EP)
Title: Inflating device for tyres on vehicles, particularly bicycles
IPC: B60C23/12
Filed: 1988-07-22
Abstract: An inflating device for tyres on vehicles, particularly bicycles, has a valve coupled to an air pump which possesses a pump housing connected to the rim and a pump piston guided displaceably therein. The latter runs on a fixed guide path which results in a spacing changing in the radial direction, the pump piston being spring-loaded in the direction of the guide path. The air pump has a movably mounted control element for deactivating the air pump when a specific air pressure in the tyre is reached, this control element being subjected to the tyre air pressure counter to the effect of a spring.   So that the device is small, light and space-saving, the pump piston (10) and the pump housing (9) have catch means (23, 24; 30, 31) for mutual engagement in an inwardly pressed dead-centre position of the pump piston (10), and the control element (17, 19) is so designed and is so assigned to the catch means (23, 24; 30, 31) that an engagement of the catch means (23, 24; 30, 31) is blocked below the specific air pressure. <IMAGE>