CA1174877A - Device for accurately adjusting the relative angular position of shafts driving coldshaping wheels - Google Patents
Device for accurately adjusting the relative angular position of shafts driving coldshaping wheelsInfo
- Publication number
- CA1174877A CA1174877A CA000397990A CA397990A CA1174877A CA 1174877 A CA1174877 A CA 1174877A CA 000397990 A CA000397990 A CA 000397990A CA 397990 A CA397990 A CA 397990A CA 1174877 A CA1174877 A CA 1174877A
- Authority
- CA
- Canada
- Prior art keywords
- gears
- driving
- nut
- screw
- axially displaceable
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H5/00—Making gear wheels, racks, spline shafts or worms
- B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H35/00—Gearings or mechanisms with other special functional features
- F16H35/08—Gearings or mechanisms with other special functional features for adjustment of members on moving parts from a stationary place
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gear Transmission (AREA)
- Transmission Devices (AREA)
- Forging (AREA)
- Machine Tool Positioning Apparatuses (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a device for accurately adjusting the relative angular positions of shafts driving shaping wheels in a rotary forging machine, wherein at least two shafts which are required to rotate in the same direction and synchronously are integral with helical-tooth driven gears which are in constant engagement with at least one conjugate-tooth driving gear which is coupled to a driving device, one at least of said gears being axially displaceable and connected to a micrometric device for adjusting its axial position for determining the relative angular positions of the driven gears in accordance with the inclination of the teeth.
The present invention relates to a device for accurately adjusting the relative angular positions of shafts driving shaping wheels in a rotary forging machine, wherein at least two shafts which are required to rotate in the same direction and synchronously are integral with helical-tooth driven gears which are in constant engagement with at least one conjugate-tooth driving gear which is coupled to a driving device, one at least of said gears being axially displaceable and connected to a micrometric device for adjusting its axial position for determining the relative angular positions of the driven gears in accordance with the inclination of the teeth.
Description
` ~ ~74~7~
The present invention relates to the technique known as rotary forging, wherein two shaping rolls take a blank workpiece for shaping between two diametrically opposite contact areas on the rolls, which are rotated.
The rolls drive the workpiece without any slipping, and exert on the workpiece a deforming pressure such as to give to the latter a profile corresponding to the profiles of the shaping rolls. The rolls are re~uired to rotate in synchronism and the relative angular positions of their profiles should be adjusted with accuracy so that the mark left by one of the rolls on the workpiece meshes perfectly, after a half-turn rotation of the workpiece, with the design of the other wheel. This technique is used in the production of threads and involute grooves, and in tooth cutting, and in the production of revolving parts with complex profiles, etc.
The present invention is concerned with accurate adjustment of the relative angular positions of at least two of such shaping rolls to arrive at the result indicated hereinabove. An object of the invention is to achieve accuracy, in a simple and reliable way, during the operation of the rotary forging machine, and whatever the intensity of the forces exerted.
According to the invention there is provided a device for accurately adjusting the relative angular positions of shaping rolls in a rotary forging machine, wherein at least two shafts which are required to rotate in the same direction and synchronously are provided with said shaping rolls and with helical-tooth driven gears which are rotatable with said shafts in constant engagement with at least one conjugate-tooth driving gear which is coupled to a driving device, one at least of said gears being axially displaceable and connected to a micrometric device for adjusting the axial position of said axially displaceable gear for determining the relative angular positions of said ..
' .
, : .
.
1~74~3'7~
driven gears in accordance with the inclination of the teeth.
According to a particularly advantageous embodiment of the invention, the device comprises only one helical~tooth driving gear which is in engagement with the identical conjugated ones of at least two of the driven gears, only one of which is axially displaceable, the micrometric adjustment device acting on the axially displaceable driven gear. Preferably, the adjusting means comprise a micrometric screw and nut transmission of which the screw which is coupled to a control means and retained against axial displacement and co-operates with a nut, which is axially displaceable and retained against rotation, said nut being integral with a fork engaged on the axially displaceable driven gear.
The invention will be more readily understood on reading the following description of emhodiments thereof with reference to the accompanying drawings in which:
FIGURE 1 is a perspective view showing a first embodiment of the adjusting device according to the invention.
FIGURE 2 is a cross-sectional view along line II-II of Fig. 1 compared with a different parallel cross-sectional view of the device of Fig. 1.
FIGURE 3 is a similar view to that shown in Fig.
1, illustrating a second embodiment of the invention.
The rotary forging machine comprises a moto-reducer or moto-variator set 1 provided for rotationally driving in synchronism two shafts 2 and 3 on which are mounted, either directly or via inclinable shafts co-operating with Cardan joints as in certain mills, coldshaping wheels 4 and 5 designed to shape a workpiece 6 interposed therebetween (Figure 2).
According to the embodiment illustrated in Fig.
1, the output member of the set 1 is connected, via a ~ :1 7~377 sliding coupling, to a driving shaft 7 integral with two gears 8 and 9, having symmetrically-inclined helical teeth. The driving gear 8 is in permanent engagement with a conjugate-tooth driven gear 10, integral with the driving shaft 2. In like manner, the driving gear 9 is in permanent engagement with a conjugate-tooth driven gear 11, integral with the driving shaft 3. The helical teeth of the driven gears 10 and 11 are symmetrically inclined, just as the helical teeth of the driving gears are; and like the latter, the driven gears are axially offset and therefore are not facing one another.
Referring now to Fig. 2, this shows that the driving gear 8 is in contact with the driven gear 10 in the zone A and the driving gear 9 is in contact with the driven gear 11 in the zone B, the two zones A ~ B being diametrically opposite. In like manner, the wheel 4 is in contact with the workpiece 6 in a zone C which is diametrically opposite to the contact zone D of workpiece with the wheel 5. It is quite obvious that the marks left at C and D on the workpiece 6 by the wheels 4 and 5 respectively, will, once the piece has made a half-turn rotation, cover the designs which follow correspondingly with the rotation, not on the wheels 4 and 5, but on the wheels 5 and 4. It is therefore important for the angular position of the wheels one with respect to the other to be perfectly accurate so that the designs of each one are printed into the workpiece, following strictly the mark left by the designs of the opposite wheel. It is therefore necessary to be able to accurately adjust, at any moment, the relative angular positions of the wheels, i.e. of points C and D, and consequently, the relative angular positions of the driven gears 10 and 11, i.e. of points A
and B. This angular position however varies when the driving gears 8 and 9 are moved in coaxial translation, this because of the inclination of the helical teeth.
:
., d ~.~L74~77 Obviously, no axial pressure is exerted on the shaft 7, since the teeth of the driving gears 8 and 9 which are comparable to double-helical gears, cancel out the axial reactions, because of the symmetry.
According to the embodiment illustrated in Fig.
1, the device for adjusting the said position comprises a micrometric screw and nut transmission comprising a screw 12 integral with a rod 13 of which one end is coupled to the shaft 7 via a double-action thrust ball bearing 14 which transmits the axial displacement of the screw to the shaft in both directions, but not the rotation of the latter to the screw; in fact, the other end of the rod is guided for axial displacement in a support 15 and prevented from turning by a key 16; the nut 17 is free in rotation but retained from axial displacement by a fork 18 integral with the fixed support 15. The adjusting device further comprises worm gearing for controlling the adjustment; the gear 19 is cut on the periphery of the nut 17 and the worm 20 which meshes with the gear 19 is carried by an operating lever 21. The lever 21 is pivotally mounted and retained against axial displacement in the fixed body 22 of a meter 23; it is provided with a knob 24 or with a gripping handle for adjusting purposes.
Thus, by operating the knob 24, the worm 20 is caused to pivot and as a result the gear 19 and the nut 17 with which it is fast, the effect being an axial displacement, in one direction or in the opposite one, of the micrometric screw 12, which latter drives in the same movement the driving gears 8 and 9. As a result, the driven gears 10 and 11 are angularly offset one with respect to the other. The adjustment is effected until the marks left by the wheels 4 and 5 on the workpiece 6 coincide perfectly.
According to a second embodiment of the invention illustrated in Fig. 3, the device comprises, as previously, _ 4 _ . .
.
' ~4~77 a set 1, a driving shaft 7 and driven shafts 2, 3 which drive coldshaping wheels 4, 5 designed for shaping a piece 6 interposed between them.
However, in this second embodiment, the driven shafts 2 and 3 are integral with gears 25 and 26 which are normally situated one opposite the other and the respective ~elical teeth of which are identical and have the same inclination. The gears 25 and 26 are in engagement with a driving gear 27 coupled to the shaft 7 and the helical teeth of which are symmetrical relative to the teeth of the driven gears.
In this particular embodiment, the adjusting device, as shown in Fig. 3, also comprises a micrometric screw and nut transmission. The nut 2~ is guided for axial or longitudinal displacement by a fixed guide track 29 ; which prevents it from rotating and it is integral with a fork 30 which transmits the axial displacement of the nut to the driven gear 26. The screw 31 which co-operates with the nut is free to rotate but a rod 32 with which it is fast and which is provided with a control knob 33, is retained against axial displacement inside the fixed body of a meter 35.
As a result, by operating the knob 33, the screw 31 is caused to pivot, axially displacing the nut 27 and, via the fork 30, the driven gear 26. Due to the coupling of the three gears and to the inclination of their teeth, the axial displacement generates a relative angular offset of the teeth of the driven gears 25 and 26, hence of the wheel-carrying shafts 2 and 3.
In this case, an axial thrust is exerted on the shaft 3, because of the reaction of the teeth. However, since the inclination of the teeth is slight, the thrust is relatively small and can easily be taken up by the thrust bearings of the shaft.
The machine can of course comprise more than two .1 . ~ :
: ` :
~174B77 shaping wheels and as many driving shafts coupled to as many driven gears meshing with at least one driving gear.
In this case, at least one of these helical-tooth gears should be axially movable in order to be able to adjust the relative angular wedging of all the wheels.
The invention is in no way limited to the embodiments given hereinabove and on the contrary various modifications can be brought thereto without departing from the scope thereof.
The present invention relates to the technique known as rotary forging, wherein two shaping rolls take a blank workpiece for shaping between two diametrically opposite contact areas on the rolls, which are rotated.
The rolls drive the workpiece without any slipping, and exert on the workpiece a deforming pressure such as to give to the latter a profile corresponding to the profiles of the shaping rolls. The rolls are re~uired to rotate in synchronism and the relative angular positions of their profiles should be adjusted with accuracy so that the mark left by one of the rolls on the workpiece meshes perfectly, after a half-turn rotation of the workpiece, with the design of the other wheel. This technique is used in the production of threads and involute grooves, and in tooth cutting, and in the production of revolving parts with complex profiles, etc.
The present invention is concerned with accurate adjustment of the relative angular positions of at least two of such shaping rolls to arrive at the result indicated hereinabove. An object of the invention is to achieve accuracy, in a simple and reliable way, during the operation of the rotary forging machine, and whatever the intensity of the forces exerted.
According to the invention there is provided a device for accurately adjusting the relative angular positions of shaping rolls in a rotary forging machine, wherein at least two shafts which are required to rotate in the same direction and synchronously are provided with said shaping rolls and with helical-tooth driven gears which are rotatable with said shafts in constant engagement with at least one conjugate-tooth driving gear which is coupled to a driving device, one at least of said gears being axially displaceable and connected to a micrometric device for adjusting the axial position of said axially displaceable gear for determining the relative angular positions of said ..
' .
, : .
.
1~74~3'7~
driven gears in accordance with the inclination of the teeth.
According to a particularly advantageous embodiment of the invention, the device comprises only one helical~tooth driving gear which is in engagement with the identical conjugated ones of at least two of the driven gears, only one of which is axially displaceable, the micrometric adjustment device acting on the axially displaceable driven gear. Preferably, the adjusting means comprise a micrometric screw and nut transmission of which the screw which is coupled to a control means and retained against axial displacement and co-operates with a nut, which is axially displaceable and retained against rotation, said nut being integral with a fork engaged on the axially displaceable driven gear.
The invention will be more readily understood on reading the following description of emhodiments thereof with reference to the accompanying drawings in which:
FIGURE 1 is a perspective view showing a first embodiment of the adjusting device according to the invention.
FIGURE 2 is a cross-sectional view along line II-II of Fig. 1 compared with a different parallel cross-sectional view of the device of Fig. 1.
FIGURE 3 is a similar view to that shown in Fig.
1, illustrating a second embodiment of the invention.
The rotary forging machine comprises a moto-reducer or moto-variator set 1 provided for rotationally driving in synchronism two shafts 2 and 3 on which are mounted, either directly or via inclinable shafts co-operating with Cardan joints as in certain mills, coldshaping wheels 4 and 5 designed to shape a workpiece 6 interposed therebetween (Figure 2).
According to the embodiment illustrated in Fig.
1, the output member of the set 1 is connected, via a ~ :1 7~377 sliding coupling, to a driving shaft 7 integral with two gears 8 and 9, having symmetrically-inclined helical teeth. The driving gear 8 is in permanent engagement with a conjugate-tooth driven gear 10, integral with the driving shaft 2. In like manner, the driving gear 9 is in permanent engagement with a conjugate-tooth driven gear 11, integral with the driving shaft 3. The helical teeth of the driven gears 10 and 11 are symmetrically inclined, just as the helical teeth of the driving gears are; and like the latter, the driven gears are axially offset and therefore are not facing one another.
Referring now to Fig. 2, this shows that the driving gear 8 is in contact with the driven gear 10 in the zone A and the driving gear 9 is in contact with the driven gear 11 in the zone B, the two zones A ~ B being diametrically opposite. In like manner, the wheel 4 is in contact with the workpiece 6 in a zone C which is diametrically opposite to the contact zone D of workpiece with the wheel 5. It is quite obvious that the marks left at C and D on the workpiece 6 by the wheels 4 and 5 respectively, will, once the piece has made a half-turn rotation, cover the designs which follow correspondingly with the rotation, not on the wheels 4 and 5, but on the wheels 5 and 4. It is therefore important for the angular position of the wheels one with respect to the other to be perfectly accurate so that the designs of each one are printed into the workpiece, following strictly the mark left by the designs of the opposite wheel. It is therefore necessary to be able to accurately adjust, at any moment, the relative angular positions of the wheels, i.e. of points C and D, and consequently, the relative angular positions of the driven gears 10 and 11, i.e. of points A
and B. This angular position however varies when the driving gears 8 and 9 are moved in coaxial translation, this because of the inclination of the helical teeth.
:
., d ~.~L74~77 Obviously, no axial pressure is exerted on the shaft 7, since the teeth of the driving gears 8 and 9 which are comparable to double-helical gears, cancel out the axial reactions, because of the symmetry.
According to the embodiment illustrated in Fig.
1, the device for adjusting the said position comprises a micrometric screw and nut transmission comprising a screw 12 integral with a rod 13 of which one end is coupled to the shaft 7 via a double-action thrust ball bearing 14 which transmits the axial displacement of the screw to the shaft in both directions, but not the rotation of the latter to the screw; in fact, the other end of the rod is guided for axial displacement in a support 15 and prevented from turning by a key 16; the nut 17 is free in rotation but retained from axial displacement by a fork 18 integral with the fixed support 15. The adjusting device further comprises worm gearing for controlling the adjustment; the gear 19 is cut on the periphery of the nut 17 and the worm 20 which meshes with the gear 19 is carried by an operating lever 21. The lever 21 is pivotally mounted and retained against axial displacement in the fixed body 22 of a meter 23; it is provided with a knob 24 or with a gripping handle for adjusting purposes.
Thus, by operating the knob 24, the worm 20 is caused to pivot and as a result the gear 19 and the nut 17 with which it is fast, the effect being an axial displacement, in one direction or in the opposite one, of the micrometric screw 12, which latter drives in the same movement the driving gears 8 and 9. As a result, the driven gears 10 and 11 are angularly offset one with respect to the other. The adjustment is effected until the marks left by the wheels 4 and 5 on the workpiece 6 coincide perfectly.
According to a second embodiment of the invention illustrated in Fig. 3, the device comprises, as previously, _ 4 _ . .
.
' ~4~77 a set 1, a driving shaft 7 and driven shafts 2, 3 which drive coldshaping wheels 4, 5 designed for shaping a piece 6 interposed between them.
However, in this second embodiment, the driven shafts 2 and 3 are integral with gears 25 and 26 which are normally situated one opposite the other and the respective ~elical teeth of which are identical and have the same inclination. The gears 25 and 26 are in engagement with a driving gear 27 coupled to the shaft 7 and the helical teeth of which are symmetrical relative to the teeth of the driven gears.
In this particular embodiment, the adjusting device, as shown in Fig. 3, also comprises a micrometric screw and nut transmission. The nut 2~ is guided for axial or longitudinal displacement by a fixed guide track 29 ; which prevents it from rotating and it is integral with a fork 30 which transmits the axial displacement of the nut to the driven gear 26. The screw 31 which co-operates with the nut is free to rotate but a rod 32 with which it is fast and which is provided with a control knob 33, is retained against axial displacement inside the fixed body of a meter 35.
As a result, by operating the knob 33, the screw 31 is caused to pivot, axially displacing the nut 27 and, via the fork 30, the driven gear 26. Due to the coupling of the three gears and to the inclination of their teeth, the axial displacement generates a relative angular offset of the teeth of the driven gears 25 and 26, hence of the wheel-carrying shafts 2 and 3.
In this case, an axial thrust is exerted on the shaft 3, because of the reaction of the teeth. However, since the inclination of the teeth is slight, the thrust is relatively small and can easily be taken up by the thrust bearings of the shaft.
The machine can of course comprise more than two .1 . ~ :
: ` :
~174B77 shaping wheels and as many driving shafts coupled to as many driven gears meshing with at least one driving gear.
In this case, at least one of these helical-tooth gears should be axially movable in order to be able to adjust the relative angular wedging of all the wheels.
The invention is in no way limited to the embodiments given hereinabove and on the contrary various modifications can be brought thereto without departing from the scope thereof.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for accurately adjusting the relative angular positions of shaping rolls in a rotary forging machine, wherein at least two shafts which are required to rotate in the same direction and synchronously are provided with said shaping rolls and with helical-tooth driven gears which are rotatable with said shafts in constant engagement with at least one conjugate-tooth driving gear which is being axially coupled to a driving device, one at least of said gears displaceable and connected to a micrometric device for adjusting the axial position of said axially displaceable gear for determining the relative angular positions of said driven gears in accordance with the inclination of the teeth.
2. A device as claimed in claim 1, wherein said device comprises two driving gears with symmetrically inclined helical teeth, which gears are coaxial and rotatable together and are in engagement with said driven gears, said driven gears being retained against axial displacement and said micrometric adjustment device acting on both of said driving gears together.
3. A device as claimed in claim 2, wherein said adjustment device comprises a micrometric screw and nut transmission comprising a screw retained against rotation and coupled by a rotary bearing to said driving gears, said screw being axially displaceable, said transmission including a nut retained against axial displacement and being free to rotate and connected to a control means.
4. A device as claimed in claim 3, wherein said control means comprises a gear integral with said nut and meshing with a worm extended by an operating lever.
5. A device as claimed in claim 1, comprising only one helical-tooth driving gear which is in engagement with identical conjugate teeth of at least two of said driven gears, only one of which is axially displaceable, said micrometric adjustment device acting on said axially displaceable driven gear.
6. Device as claimed in claim 5, wherein the said adjustment device comprises a micrometric screw and nut transmission comprising a screw coupled to a control means, said screw being retained against axial displacement and co-operating with a nut which is axially displaceable and retained against rotation, said nut being integral with a fork supporting said axially displaceable driven gear.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8105329 | 1981-03-17 | ||
| FR8105329A FR2502360A1 (en) | 1981-03-17 | 1981-03-17 | DEVICE FOR PRECISE ADJUSTMENT OF THE RELATIVE ANGULAR SETTING OF THE SHAFTS DRIVING COLD FORMING WHEELS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1174877A true CA1174877A (en) | 1984-09-25 |
Family
ID=9256336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000397990A Expired CA1174877A (en) | 1981-03-17 | 1982-03-10 | Device for accurately adjusting the relative angular position of shafts driving coldshaping wheels |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0061958B1 (en) |
| AT (1) | ATE14086T1 (en) |
| CA (1) | CA1174877A (en) |
| DE (1) | DE3264502D1 (en) |
| ES (1) | ES8303739A1 (en) |
| FR (1) | FR2502360A1 (en) |
| MX (1) | MX157010A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3720661A1 (en) * | 1987-06-23 | 1989-01-05 | Wanderer Maschinen Gmbh | METHOD FOR THE ALTERNATIVE ALIGNMENT OF AT LEAST TWO ROLLING TOOLS, AND THE DEVICE PROVIDED FOR THEM, AND THE RELATED ROLLING TOOL |
| GB9706514D0 (en) * | 1997-04-01 | 1997-05-21 | Skit Scotland Limited | Apparatus for manufacturing ribbon cables |
| CN102814435B (en) * | 2012-08-24 | 2014-07-23 | 西安交通大学 | Method for roll forming spline shaft by medium-frequency and high-frequency sensing heating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2087831A (en) * | 1935-12-30 | 1937-07-20 | David P Anderson | Die rolling |
| US2689493A (en) * | 1950-02-20 | 1954-09-21 | Emma G Bedker | Apparatus for rolling grooves |
| DE1552194A1 (en) * | 1966-10-10 | 1970-12-17 | Vnii Pk I Metall Mash Vniimet | Tooth profile rolling machine |
-
1981
- 1981-03-17 FR FR8105329A patent/FR2502360A1/en active Granted
-
1982
- 1982-03-10 CA CA000397990A patent/CA1174877A/en not_active Expired
- 1982-03-15 DE DE8282400475T patent/DE3264502D1/en not_active Expired
- 1982-03-15 AT AT82400475T patent/ATE14086T1/en not_active IP Right Cessation
- 1982-03-15 EP EP82400475A patent/EP0061958B1/en not_active Expired
- 1982-03-16 MX MX191829A patent/MX157010A/en unknown
- 1982-03-17 ES ES510537A patent/ES8303739A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0061958B1 (en) | 1985-07-03 |
| ES510537A0 (en) | 1983-02-01 |
| ATE14086T1 (en) | 1985-07-15 |
| DE3264502D1 (en) | 1985-08-08 |
| MX157010A (en) | 1988-10-19 |
| EP0061958A1 (en) | 1982-10-06 |
| FR2502360B1 (en) | 1985-03-22 |
| ES8303739A1 (en) | 1983-02-01 |
| FR2502360A1 (en) | 1982-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |