EP0809551A1 - Arretiereinrichtung - Google Patents
ArretiereinrichtungInfo
- Publication number
- EP0809551A1 EP0809551A1 EP96901634A EP96901634A EP0809551A1 EP 0809551 A1 EP0809551 A1 EP 0809551A1 EP 96901634 A EP96901634 A EP 96901634A EP 96901634 A EP96901634 A EP 96901634A EP 0809551 A1 EP0809551 A1 EP 0809551A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- bending
- locking device
- brake shoes
- punch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
Definitions
- the invention relates to a locking device for a bending die which can be moved linearly back and forth in a machine frame of a sheet metal bending device between two side stands.
- the known locking devices are disadvantageous in that, in the case of a self-locking spindle drive for the upper bending punch, it is often difficult to release the self-locking after locking, for which purpose shaking movements or the like are required; and in the case of the pressure cylinder drives with a toggle joint, locking in only one particular working position is possible. If a different working position for the upper bending punch is required for other sheet thicknesses, a complex adjustment mechanism must be provided and activated for this purpose, since the toggle joint does not permit the upper bending punch to be locked or locked in different vertical positions.
- DE 22 09 884 A also describes a cutting press in which a braking force counteracting the drive movement is applied to the press ram during cutting.
- This is a movement brake with which kinetic energy is converted into thermal energy by sliding friction.
- the brake is actuated by means of a hydraulic system, specifically at a precisely defined point in time of the work process, namely during the so-called "break through”, as well the subsequent release of the brake, and such a braking action is typical of crank or eccentric presses, such as the known cutting press, but is not suitable for locking a counter-bending punch, in which a movement, however small, relative to the side stands for the bending process would be extremely disadvantageous, since this would change the distance between the bending tools and thus worsen the bending accuracy. It would therefore be very important for the present locking device that there be a real "standstill brake".
- the DD 85047 A finally shows a locking device in which a toothed tab 7 is tightened against a surface of the stand of the bending machine provided with a corresponding toothing.
- a bolt with a nut is provided for this. It is essential that the toothing is arranged transversely to the force effect, with friction conditions not playing a role. The adjustment range is limited by the tooth pitch. If the position of the bending beam changes, numerous work steps have to be carried out.
- the locking device according to the invention is accordingly characterized by, between the bending punch and the side guides, the bending punch in the bending phase on the Parking brackets which fix the side stands with brake rails and with brake shoes which can be applied to these brake rails and moved back by them.
- the locking device With such a design of the locking device, it is possible to hold the bending punch quickly and securely in a large range of positions and nonetheless also to release it quickly again. It is in itself conceivable - for example in the case of smaller sheet-metal bending devices - to firmly attach the brake rails to the bending punch - in particular on its longitudinal side edges parallel to the direction of movement, whereas the brake shoes together with the associated drive in the area the side guides, usually the side stand of the machine frame, can be accommodated movably. In view of the usually cheaper space available in the machine frame, this can be quite expedient. However, it is particularly preferred according to the invention if the movable brake shoes are mounted on the bending die, whereas the brake rails are fixed stationary on the side guides or side stands.
- This type of construction is particularly advantageous in the case of larger sheet metal bending devices designed for strong bending work, where there is sufficient space on the bending die itself for the mounting of the brake shoes and for the attachment of the drive for these brake shoes.
- a further advantage can moreover be achieved in that by utilizing forces acting on the bending punch during the bending on the bending punch for braking with less massive bending punch designs, it can be found; It is essential for this that the forces acting on the arrested bending ram during bending are partially introduced via the bearings for the brake shoes into the brake shoes themselves, it then being sufficient to make this area of the bearings and the support for the brake shoes sufficiently rigid. This enables an overall "light” bending punch construction with nonetheless sufficient dimensional stability in combination with a "quick” locking mechanism.
- articulated rods can be articulated as rigid, solid levers (two articulated rods) in a bearing on the bending punch, the positions of the articulation points being able to be selected according to the particular circumstances, but in particular in order to introduce forces as efficiently as possible.
- the joint rods are inclined to the direction of movement of the bending die, e.g. have longitudinal axis extending at an angle between 40 ° and 50 °, in particular 45 °, preferably 48 °.
- the articulation points of the joint rods on the punch are each at a distance from the side edges of the punch, measured in the longitudinal direction of the punch, transverse to the direction of movement. of approximately 1/5 of the total longitudinal extent of the bending die are provided.
- the deflection at the lower edge of the punch is practically zero, and in the area, in a vertical projection of the articulation points of the articulated rods - wherein these articulation points are expediently provided as close as possible to the lower edge of the bending die From these points to the side edges on the one hand (approx.
- a relatively lightly designed linkage can be provided, which is coupled to the drive, and it has proven to be particularly advantageous here if the brake shoes are applied or moved back to the or from the brake rails pivotally mounted on the bending die, two-arm lever-forming parallel linkage rods are provided, which are articulated on the one hand with the brake shoes, possibly the brake consoles, and on the other hand with the drive.
- the drive has a spindle, which can be driven by a motor and is mounted on the bending die in the middle of its longitudinal extent, on which a spindle nut connected to a yoke is arranged, the parallelogram linkage in each case connected to the The top and bottom of the yoke, for example via rollers, are held.
- the spindle nut is moved up and down along the rotating spindle, each parallelogram linkage is moved up and down in the central area together with the yoke and the spindle nut, and depending on the lever ratio, the brake shoes are either pressed against the brake rails in short-stroke movements or by withdrawn this.
- the additional braking force required for bending is then passed on to the brake shoes as mentioned by the bending force absorbed by the counter-bending punch, in order to make them stronger against the brake shoes To press brake rails, the higher the bending force.
- the parallelogram linkages are preloaded with the adjustable spring washers Brake shoes, possibly connected to the brake brackets.
- the brake shoes and the brake rails have a profile that extends in a zigzag shape in cross section perpendicular to the direction of movement of the bending die.
- the brake rails are made longer in the direction of movement of the bending punch than the brake shoes.
- the braking effect has proven to be a particularly favorable compromise if these parts consist of tempered steel.
- the contact surfaces can simply be machined.
- the initial braking effect might be cheaper than in the case of hardened and tempered steel, however, the service life of such materials is rather short, in contrast to the hardened and tempered steel, in which particularly long tool lives can be achieved, but a sufficient bre effect can nevertheless be achieved.
- the parts of the holding brakes on the side of the bending punch, in particular the brake shoes together with the bearings, can in themselves, for example in the case of smaller versions of sheet metal bending devices, be provided on one side of the bending punch, with the result that a small lever arm (the distance from the plane of symmetry of the counterhold) Bending stamp) acting torques can still be negligible.
- a small lever arm the distance from the plane of symmetry of the counterhold
- the brake shoes optionally including brake consoles, together with their drive inside a box Cheek-shaped cheek of the bending punch are arranged, wherein the brake shoes, and possibly the brake brackets, protrude outward through openings on the side edges of the box-shaped cheek and the cheek carries a bending tool over a tool holder.
- a simple construction is characterized in that the box-shaped cheek is constructed with a front and a rear plate and a cover strip arranged on the side facing away from the tool, which leaves access openings to the brake shoes, and possibly the brake brackets, the Box of the cheek on the side opposite the end strip is directly closed by the tool holder.
- the counter-bending punch consists of a rigid box construction with two parallel, vertical plates, the tool holder as a lock, an upper cover strip and a locking device arranged between them, inside the box, which has two mirror-image brakes, which act towards the outside, towards the machine frame side stands.
- Every brake applied consists of a movable brake shoe and a fixed brake rail attached to the side stand.
- the brake shoe is arranged on a brake console, which is articulated at the end of a strong, movable lever, the (two) joint rod.
- the brake shoes are pressed and preloaded on the brake rails by means of a drive acting in common for both sides, via parallelogram linkages.
- the side stands are clamped together with the help of the cross bars or drawstrings arranged in front of and behind the bending die, ie its upper cheek.
- the two-joint rod which can be pivoted with its second joint inside the upper cheek box, the bending force absorbed by the upper tool is guided from below to the brake shoe at an angle of, for example, approximately 45 °.
- the braking force comes from the bending process and is therefore always proportional to the bending force; the lifting drive of the top beam is not loaded during the locking process and can even be switched off in the meantime.
- the reduced distance between the inner joints causes a significantly reduced deflection of the upper cheek, which can now be carried out more easily, lower and without a crowning device.
- the brakes are opened again ("release") by means of the brake drive, the two-jointed rods participating in the movement as a slight pivoting movement; the upper beam is now free and can be moved with the help of its lifting drive.
- the drive of the brake contains a motor-driven, centrally arranged, vertical spindle and a plate-shaped, movable yoke which carries the spindle nut.
- the spindle and the drive motor are mounted inside the top beam.
- the yoke engages in the parallelogram rods on both sides, which are thus carried along by the yoke when the spindle nut moves up and down, the pairs of levers of the parallelogram rods being guided by rollers on the top and bottom of the yoke.
- the parallelogram linkages are pivotally mounted on pivot bolts within the upper beam and are connected to the brake brackets of the brake shoes in an adjustable, prestressed manner at the outer ends via disk spring assemblies.
- the disc springs also compensate for manufacturing inaccuracies between the two sides.
- the brake rails and brake shoes engage with a congruent zigzag profile In the longitudinal direction into one another, the individual prongs mutually supporting one another against bending under load. Due to the inclination of the contact surfaces due to the zigzag profile, the normal force is increased to such an extent that the coefficient of friction of the conventionally machined braking surfaces is sufficient for secure locking.
- the brake rail is longer than the brake shoe, which allows the punch to be locked in a wide area.
- Fig.l is a front view of a sheet metal bending device, which is equipped with a locking device for the upper, serving as a counter-punch during bending, vertically up and down movable punch;
- FIG. 2 shows a side view of this sheet bending device, according to arrow II in Fig.l;
- FIG. 3 shows a partially broken top view of this sheet metal bending device, to illustrate essential components of the built-in locking device, essentially according to arrow III in FIG. 4;
- FIG. 4 shows a broken-away partial view of the right-hand part of the upper bending die, with the upper cheek open, the tool holder and bending tool connected to it, to illustrate the components of the locking device installed in the bending die;
- FIG. 4A shows a detail A of the locking device according to FIG. 4 in a partially broken-open view, for a clearer illustration of the connection of the brake console with the parallelogram linkage and the joint rod;
- FIG. 5 shows a view from the inside of a side stand of the sheet metal bending device, essentially according to arrow V in FIG. 3, to illustrate the side guide for the upper bending die realized by this side stand of the machine frame and to illustrate the brake rail attached stationary thereon;
- FIG. 6 shows a partial view of the upper section of this side stand, according to arrow VI in FIG. 5; 7 shows a partially broken open detailed view of the spindle drive device for the locking device;
- FIG. 8 shows a partially broken top view of this part of the spindle drive device, according to arrow VIII in FIG. 7;
- FIG. 9 shows a view of the one, right half of the braking or locking device in the upper counter-bending punch, similar to FIG. 4, but now in the open position of the locking device, whereas FIG. 4 shows the closed position or braking position.
- FIG. 1 and 2 illustrate a sheet metal bending device 1 in the form of a so-called vibration bending machine, which has a machine frame, generally designated 2, to which end-side stands 3, 4 belong, which have vertical side guides 5 and 6 (see also Fig. 5) are equipped for an upper, vertically movable up and down, serve as a counter-punch.
- This upper bending stamp 7 is referred to below for the sake of simplicity and for better distinction also counter-stamp 7).
- the counter-punch 7 consists of an upper beam 8 which is made in a rigid box construction and which on its upper edge extends over most of the machine width, i.e.
- This part of the sheet metal bending device 1 is of no further importance for the locking of the upper counter-holding die 7, so that a detailed description of the same can be omitted; it it should only be mentioned that this structure with the lower bending dies 12 can, in principle, be designed in particular in the manner described in the aforementioned WO92 / 16319 A.
- the counter-punch 7 can be adjusted by means of the side guides 5, 6 along the side stands 3, 4 vertically downward into a working position in which the sheet to be bent (not shown) is clamped against the lower bending dies 12 and back into an upper rest position.
- a conventional hoist drive as disclosed in the aforementioned W092 / 16319 A, can be provided in the area of the side stands 3, 4.
- a drive and guide bar 14 can be moved vertically along the side stand 3 (and 4) with the aid of a driven pinion 15, which meshes with the toothing 16 on the drive and guide bar 14 mounted, further used for guiding guide rollers 17 arranged in pairs.
- FIG. 4 in which one half of the counter holding die 7 together with the upper part of the drive and guide bar 14 is shown.
- the drive of the pinion 15 in the area of the two side stands 3, 4 can be derived in a conventional manner from a motor-transmission unit 18 (see FIG. 2) via shafts which are not shown in more detail.
- the two side stands 3, 4 are formed with a smaller width than below, and they are clamped together with the aid of a front and a rear drawstring 19, 20 in the form of plate-shaped cross members, so that overall a rigid frame construction is achieved.
- These drawstrings 19, 20 can be seen from the illustrations in FIGS. 2 and 3, and in the area of these drawstrings 19, 20, brake rails 21 are rigidly fixed in mirror image to the side stands 3, 4 with the aid of bolts 22, as shown in particular in the illustration 3 and 5 for the one side stand 3 shown on the right in FIG.
- brake rails 21 are part of a locking device for the counter-punch 7 when the latter is in the working position when the respective sheet is bent, and this locking device consists in essentially of two holding brakes 23 (see FIGS. 3 and 4) which are arranged in mirror image to one another and each contain a brake shoe 24 which interacts with the associated brake rail 21.
- Each brake shoe 24 is fastened by bolts 25 to a brake bracket 26, which in turn is attached to a solid articulated rod or pivot lever 28 via a solid pivot pin 27.
- This articulated rod 28 is pivotally connected at its other end to the box structure of the upper cheek 8, that is to say in detail with its front plate 30 and its rear plate 31 (FIG.
- the bearing housing is connected to the plates 30, 31 by means of bolts 32.
- the pivot axis of the pivot bearing 29 is at a distance X of approximately 20% of the total machine width from the side edge of the counter-holding die 7, cf. the representation in Fig.l.
- Such an arrangement of the pivot bearings 29 at a distance from the side edge of the counter-holding die 7 of approximately 1/5 of the machine width or counter-holding die length has been minimized in terms of the bending forces applied by the lower bending dies 12 as well as the introduction these forces via the pivot bearings 29 and the joint rods 28 in the brake brackets 26 and brake shoes 24 have proven to be particularly efficient.
- a lever linkage which is driven by a central motor 33 and an angular gear 34 by means of a spindle drive 35.
- the motor 33 sits on a longitudinal beam 36, which at the same time holds the two swivel bearings 29 apart (in FIG. 4 only the one on the right) against being pressed together.
- 4 also shows an approximately rectangular recess 37 in the rear plate 31 of the upper cheek 8, which enables access to the motor 33 and the angular gear 34.
- the spindle drive 35 contains a spindle 40 which runs in an elongated housing 38 and is rotatably mounted in an upper bearing 39 and is arranged with its longitudinal axis essentially vertically within the upper cheek 8.
- a spindle 40 which runs in an elongated housing 38 and is rotatably mounted in an upper bearing 39 and is arranged with its longitudinal axis essentially vertically within the upper cheek 8.
- Spindle nut 41 which is fixedly connected to a plate-shaped, horizontal yoke 42. Therefore, if the spindle 40 is driven in rotation by the motor 33 via the angular gear 34, the spindle nut 41 and with it the yoke 42 can be adjusted vertically downwards or upwards depending on the direction of rotation of the spindle 40.
- This vertical adjustment movement is carried out on the yoke 42 by means of parallelogram rods 45 which rest and are held on rollers 43, 44, the two-armed levers 46, 47 of which are clamped together in the area of the yoke 42 by short connecting rods 48.
- the levers 46, 47 are connected in an articulated manner to a support block 49 near the other, outer ends, and at a short distance therefrom these levers 46, 47 are pivotably mounted on the plates 30, 31 of the upper beam 8 via pivot pins 50, 51.
- the Trag ⁇ block 49 which can be made of several plates or partial blocks, carries the brake bracket 26 via a Telle spring pack 52, which is adjustable or readjustable, for example, with the aid of bolts 53. 3 and FIG. 4A, the articulated connection of the parallelogram linkage 45 with the support block 49 via pivot pin 54 can also be seen in more detail.
- the disc spring assemblies 52 when the brake brackets 26 with the brake shoes 24 attached to them are moved slightly outwards (to the right according to the illustration in FIG. 4) with the aid of the parallelogram linkage 45, compensate for manufacturing tolerances and in the movement control itself, when the respective parallelogram linkage 45, when it is moved upward in the middle by the spindle drive 35, pivots about the pivot axes 50, 51 and thereby, via the joints 54, the brake bracket 26 with the brake shoes 24 - while pivoting the pivot rods 28 about their pivot bearing 29 - initially against the Brake rail 21 presses resiliently (Fig. 4, 4A).
- the brake rails 21 as well as the end faces of the brake shoes 24 are provided, as can be seen in particular in FIG.
- the angle Zi between the articulated rod axis 56 and the vertical direction of movement is generally between 40 ° and 50 ° and in particular approximately 45 ° Value of 48 ° - corresponding to a complementary angle of 42 ° between the pivot rod axis 56 and the horizontal - has proven to be particularly favorable.
- a linear guide illustrated schematically at 59 in FIG. 8, is provided on the upper cheek 8, in particular on its front plate 30.
- the support block 49 is constructed from two parts 60, 61 which are vertically movable relative to one another and which enable height compensation when the brakes 23 are released.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT232/95 | 1995-02-08 | ||
AT23295 | 1995-02-08 | ||
AT23295 | 1995-02-08 | ||
PCT/AT1996/000022 WO1996024444A1 (de) | 1995-02-08 | 1996-02-08 | Arretiereinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0809551A1 true EP0809551A1 (de) | 1997-12-03 |
EP0809551B1 EP0809551B1 (de) | 2000-05-10 |
Family
ID=3485073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96901634A Expired - Lifetime EP0809551B1 (de) | 1995-02-08 | 1996-02-08 | Blechbiegevorrichtung mit einer arretiereinrichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0809551B1 (de) |
AT (1) | ATE192676T1 (de) |
DE (1) | DE59605187D1 (de) |
WO (1) | WO1996024444A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3044526A (en) * | 1960-02-15 | 1962-07-17 | Percy L Cady Jr | Brake for forming metal plate and sheet |
US3282076A (en) * | 1963-12-20 | 1966-11-01 | Laval Turbine | Brakes for forming plate or sheet workpieces |
JPH072088Y2 (ja) * | 1988-11-15 | 1995-01-25 | 株式会社小松製作所 | 曲げ機械の工具位置制御装置 |
GB2226516B (en) * | 1988-12-29 | 1993-06-09 | Amada Co Ltd | Sheet workpiece bending machine and method of using same |
US5121626A (en) * | 1991-08-06 | 1992-06-16 | Caterpillar Inc. | Adjustable die support for a press brake |
-
1996
- 1996-02-08 EP EP96901634A patent/EP0809551B1/de not_active Expired - Lifetime
- 1996-02-08 DE DE59605187T patent/DE59605187D1/de not_active Expired - Fee Related
- 1996-02-08 AT AT96901634T patent/ATE192676T1/de not_active IP Right Cessation
- 1996-02-08 WO PCT/AT1996/000022 patent/WO1996024444A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9624444A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0809551B1 (de) | 2000-05-10 |
DE59605187D1 (de) | 2000-06-15 |
WO1996024444A1 (de) | 1996-08-15 |
ATE192676T1 (de) | 2000-05-15 |
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