EP0222933B1 - Mixing apparatus having a mixing screw and a conical mixing vessel - Google Patents
Mixing apparatus having a mixing screw and a conical mixing vessel Download PDFInfo
- Publication number
- EP0222933B1 EP0222933B1 EP85201905A EP85201905A EP0222933B1 EP 0222933 B1 EP0222933 B1 EP 0222933B1 EP 85201905 A EP85201905 A EP 85201905A EP 85201905 A EP85201905 A EP 85201905A EP 0222933 B1 EP0222933 B1 EP 0222933B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixing
- vessel
- plate
- secured
- mixing apparatus
- 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
- 238000007789 sealing Methods 0.000 claims description 20
- 238000012856 packing Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 4
- 210000004907 gland Anatomy 0.000 claims description 4
- 239000000463 material Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/95—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
- B01F27/953—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis using only helical stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/40—Mounting or supporting mixing devices or receptacles; Clamping or holding arrangements therefor
- B01F35/41—Mounting or supporting stirrer shafts or stirrer units on receptacles
- B01F35/412—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting both extremities of the shaft
- B01F35/4121—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting both extremities of the shaft at the top and at the bottom of the receptacle, e.g. for performing a conical orbital movement about a vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F2035/35—Use of other general mechanical engineering elements in mixing devices
- B01F2035/352—Bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/61—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis about an inclined axis
Definitions
- the invention relates to a mixing apparatus having at least one mixing vessel with a conical side wall and vertical axis and having in this mixing vessel a mixing screw which may be driven from above only, which mixing screw is simultaneously rotatable around its axis and around the mixing vessel axis which extends under an angle therewith, the mixing screw shaft being journalled adjacent to its lower end in a rotatable bearing, provided in a housing portion of the mixing apparatus below the vessel bottom, the screw shaft extending through an opening in the vessel bottom and is sealed at the position of this opening by means of a sealing element shaped as a spherical part.
- Such mixing apparatus are known, e.g. from the NL-C-162.850. According to that publication the mixing screw shaft is journalled below the vessel bottom by means of the rotary bearing and a universal joint in order to avoid contamination of the bearings by the material to be mixed.
- a spherical segment with stuffing box at the position of the vessel bottom and a sealing element relative to the screw shaft serve for permitting the passage of the screw shaft through the bottom without loss of contents of the vessel.
- the invention aims at removing this disadvantage.
- the lower end of the mixing screw shaft carries a hinge pin with which a vertical connection piece to a vertical inner bearing sleeve of the rotary bearing is articulated, said hinge pin being situated at the position of the opening in the vessel bottom
- the lower housing portion of the mixing apparatus comprising an annular horizontal plate which is secured spaced from the vessel bottom through a plurality of vertical columns to said bottom, a second plate, being in engagement with the lower side of said plate, being removably connected therewith, an outer bearing sleeve of the rotary bearing being secured to said second plate.
- the packing around the sealing element may be easily reached, as well at the lower side of, and also from the lateral side between, the column fixtures.
- the universal joint may be omitted. Due to the fixation through the columns and the absence of the moving universal joint it will now also being visible at an earlier stage when the bottom seal leaks than with the known structure in which material could accumulate within the spherical segment, namely when it is pasty, and then yet could penetrate into the rotary bearing.
- the connecting piece is secured to the inner bearing sleeve through a central threaded bolt, which is inserted from below through said sleeve.
- the head of the central bolt is of such width in radial direction that through it fasteners for clamping the bearing sleeve to the connecting piece may be screwed.
- a so-called quick service connection of both housing plates is obtained if the second plate of the lower mixer housing part is connected at a point of its circumference through a hinge connection to a superimposed point of the circumference of the first plate, eye bolts being further, circumferentially spaced, secured to one of the plates for releasably clamping the second to the first plate.
- the sphere centre of the sphere part shaped sealing element is situated in the axis of the hinge pin and is this element substantially rotationally symmetrical with reference to that centre and releasably connected to the screw.
- the screw is fixedly connected with the shaft which rotates relative to the sealing element.
- the screw rotates relative to the shaft and the sphere may be secured to the screw, since the sphere centre is in the hinge pin and the sphere radius may consequently be small.
- the spherical surface may then also contain a larger part of the theoretical sphere, on which it is based, than the known sphere segments and yet has sufficient sealing surface. Due to the smaller diameter rotation together with the screw (e.g. 70 rpm) is permitted.
- the large diameter of the known segment (caused in that the centre must be situated in the axis of the universal joint) would produce excessive heat generation and quick wear of the packing.
- the small diameter results in less space occupied by the sealing element so that it is more compact.
- the sealing means cooperating with the sphere part shaped sealing element may be a stuffing box or a fluid (air) seal.
- the vessel bottom has a ring part which is releasably secured in the bottom around the sealing element.
- the mixing vessel has a bottom 2.
- a mixing screw 3 extends into the mixing vessel, said screw being drivable in a known manner (not further shown) at the upper end around its axis with a number of revolutions of e.g. 70 rpm and also, through a swinging arm (not shown), in the position parallel to the conical wall 1 in a rotary movement along said wall and around the mixing vessel axis which includes an angle with the screw.
- the screw 3 is rotatable around a non-rotating screw shaft 6 through axial slide- thrust bearings 4 and a radial roller bearing 5.
- the screw shaft 6 has a clevis-shaped portion, which engages around a vertical connecting piece 7, a hinge pin 8 being provided in transverse direction through said parts.
- the connecting piece 7 is secured, in a manner further to be described, to an inner bearing sleeve 9 of a vertical rotary bearing which in the embodiment shown is constituted by two conical roller bearings 10 which are radially enclosed by an outer bearing sleeve 11 and axially by a closure ring 13, secured by bolts 12.
- An annular horizontal housing plate 15 is secured to the vessel bottom through columns 14 which are equally spaced around the circumference, e.g. pipe lengths, which are welded to the vessel bottom 2.
- a second housing plate 16 is releasably secured against the under side of the first housing plate 15 and said second plate is welded by radial connecting strips 17 to the outer bearing sleeve 11 of the rotary bearing.
- the second plate 16 is connected to the first plate 15 by means of a hinge 18 having a horizontal hinge pin 19.
- Spaced around its circumference pins 20 for eye bolts 21 are provided on the lower plate 16, said bolts being pivotable around the pins 20 and the bolt shank of each of which may be placed vertically, as seen in figure 1, through radial recesses extending from the outer circumference of the plates 15, 16, whereafter the shanks may be clamped against the upper side of the plate 15 through a nut 22 and a washer 23, whereby both plates 15, 16 may be fixedly mutually clamped.
- the connecting piece 7 is secured to the inner bearing sleeve 9 through a central bolt 24, which extends from below through the closure ring 13 and the sleeve 9 and is screwed into a threaded opening at the lower end of the connecting piece 7.
- a widened head 25 is connected to the bolt head through a transverse pin 26, extending radially through the widened head and the bolt head. Stud bolts 27, four in the embodiment shown, are screwed into corresponding threaded apertures of the widened head 25.
- the connection may be tensioned by screwing home the studs 27 which are in engagement with the lower side of the closure ring 16 and thereby tension the bolt 24 through the head 25. Thereby it is prevented that when screwing the bolts 24 in or out, the screw thread thereof or of the corresponding opening is damaged.
- roller bearings 10 are sealed through a cup ring seal 28 at the lower side of the outer bearing sleeve 11.
- the rotary bearing is closed at its lower end by a cover 29, which is secured to the sleeve 11 through bolts 30.
- a sphere part shaped sealing element 32 is secured to the lower end of the screw through bolts 31, around the lower end of the screw shaft 6, at the position of the hinge pin 8.
- Said sphere part shaped element contains a large portion of a sphere and is provided in a corresponding opening in a ring 33, which is secured in the vessel bottom 2 through bolts 34.
- a packing 35 with packing gland 36 and press bolts 37 may serve, such as shown in the left portion of figure 1.
- the sealing means may also be constituted by a fluid or aerodynamic seal, constituted by two vertically spaced discs 38, which are mutually and relative to the sphere part element 35 biased by a spring 39 engaged around a bolt 40 secured in the upper element 38, a plurality of which are provided spaced around the circumference. Through one or more apertures 41 air having a predetermined pressure may be supplied between the elements 38.
- the bottom cover 29 is removed by removing the bolts 30, whereby the bolts 27 may be released so that the tension in the connection between the bolt 24 and the connection piece 7 is removed. Thereafter the bolt 24 may be unscrewed by hand and may be taken out. Subsequently the nuts 22 of the eye bolts 21 are released so far that the bolts 21 may be pivoted around the pivot pins 20.
- the second or lower plate 16 of the housing Prior to pivoting the last bolt, the second or lower plate 16 of the housing is retained in position through the handle 17' and thereafter the lower plate may be pivoted around the hinge pin 19 together with the rotary bearing 9 -11 secured therein. Then the plate 16 may be released and is vertically suspended. If necessary, replacement of the roller bearings 10 or of the seals for the rotary bearing is now easy.
- the packing gland 36 is now accessible from the under side through the central opening in the annular first or upper plate 15 of the housing, so that the bolts 37 thereof may be taken out, said bolts being also accessible from the side between the columns 14.
- the packing 35 may be replaced.
- the springs 39 may be removed from the bolts 40, whereafter the lower ring 38 may be removed and the 0-ring, provided thereon and not indicated by a reference number, may be replaced.
- the sphere part element 32 may be released from the screw shaft 6 and removed through releasing the bolts 34, whereafter the ring 33 may be taken out.
- Remounting may be established by taking the above mentioned steps in reverse order.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Accessories For Mixers (AREA)
Abstract
Description
- The invention relates to a mixing apparatus having at least one mixing vessel with a conical side wall and vertical axis and having in this mixing vessel a mixing screw which may be driven from above only, which mixing screw is simultaneously rotatable around its axis and around the mixing vessel axis which extends under an angle therewith, the mixing screw shaft being journalled adjacent to its lower end in a rotatable bearing, provided in a housing portion of the mixing apparatus below the vessel bottom, the screw shaft extending through an opening in the vessel bottom and is sealed at the position of this opening by means of a sealing element shaped as a spherical part.
- Such mixing apparatus are known, e.g. from the NL-C-162.850. According to that publication the mixing screw shaft is journalled below the vessel bottom by means of the rotary bearing and a universal joint in order to avoid contamination of the bearings by the material to be mixed. A spherical segment with stuffing box at the position of the vessel bottom and a sealing element relative to the screw shaft serve for permitting the passage of the screw shaft through the bottom without loss of contents of the vessel.
- Although this apparatus operates satisfyingly a disadvantage is that, if the seals have to be renewed after a predetermined operation period, the universal joint and the rotary bearing have to be demounted in order to obtain access to said seals. This takes much work by a specialized engineer and a rather long non working period of the mixing apparatus.
- The invention aims at removing this disadvantage. This is achieved according to the invention in that the lower end of the mixing screw shaft carries a hinge pin with which a vertical connection piece to a vertical inner bearing sleeve of the rotary bearing is articulated, said hinge pin being situated at the position of the opening in the vessel bottom, the lower housing portion of the mixing apparatus comprising an annular horizontal plate which is secured spaced from the vessel bottom through a plurality of vertical columns to said bottom, a second plate, being in engagement with the lower side of said plate, being removably connected therewith, an outer bearing sleeve of the rotary bearing being secured to said second plate.
- By releasing the second plate together with the rotary bearing through some simple actions the packing around the sealing element may be easily reached, as well at the lower side of, and also from the lateral side between, the column fixtures.
- In that the screw shaft is connected by means of the connecting piece through a vertical rotary bearing the universal joint may be omitted. Due to the fixation through the columns and the absence of the moving universal joint it will now also being visible at an earlier stage when the bottom seal leaks than with the known structure in which material could accumulate within the spherical segment, namely when it is pasty, and then yet could penetrate into the rotary bearing.
- For quick release of the lower or second plate from the lower housing portion, preferably the connecting piece is secured to the inner bearing sleeve through a central threaded bolt, which is inserted from below through said sleeve.
- In order to prevent that this bolt is overrotated when establishing the connection and thereby is damaged, it is preferable when the head of the central bolt is of such width in radial direction that through it fasteners for clamping the bearing sleeve to the connecting piece may be screwed.
- A so-called quick service connection of both housing plates is obtained if the second plate of the lower mixer housing part is connected at a point of its circumference through a hinge connection to a superimposed point of the circumference of the first plate, eye bolts being further, circumferentially spaced, secured to one of the plates for releasably clamping the second to the first plate.
- Preferably the sphere centre of the sphere part shaped sealing element is situated in the axis of the hinge pin and is this element substantially rotationally symmetrical with reference to that centre and releasably connected to the screw. In the known structure the screw is fixedly connected with the shaft which rotates relative to the sealing element.
- Therefore also a seal has to be present between said sphere segment and the shaft. According to the invention the screw rotates relative to the shaft and the sphere may be secured to the screw, since the sphere centre is in the hinge pin and the sphere radius may consequently be small. The spherical surface may then also contain a larger part of the theoretical sphere, on which it is based, than the known sphere segments and yet has sufficient sealing surface. Due to the smaller diameter rotation together with the screw (e.g. 70 rpm) is permitted. The large diameter of the known segment (caused in that the centre must be situated in the axis of the universal joint) would produce excessive heat generation and quick wear of the packing. Moreover, the small diameter results in less space occupied by the sealing element so that it is more compact.
- It would also be possible to use a cylindrical sleeve as the sealing element, which is in engagement with a sleeve which extends obliquely according to the inclination angle of the screw shaft and which is secured to a ring which is rotatably provided in the vessel bottom. A disadvantage thereof is that the inclination angle and the axis of the cylindrical sleeve has to be provided very accurately since otherwise undesired tensions and friction will arise.
- The sealing means cooperating with the sphere part shaped sealing element may be a stuffing box or a fluid (air) seal.
- For demounting the sealing element preferably the vessel bottom has a ring part which is releasably secured in the bottom around the sealing element.
- The invention will be further explained below with reference to the drawing which shows as an example an embodiment of the mixer according to the invention.
- Fig. 1 shows a longitudinal section through the lower bearing structure of the mixing apparatus.
- Fig. 2 is a view from below of the mixing apparatus of fig. 1. The mixing apparatus according to fig. 1 comprises a conical mixing vessel, of which the lower portion of the upright conical wall 1 is visible in fig. 1.
- The mixing vessel has a
bottom 2. Amixing screw 3 extends into the mixing vessel, said screw being drivable in a known manner (not further shown) at the upper end around its axis with a number of revolutions of e.g. 70 rpm and also, through a swinging arm (not shown), in the position parallel to the conical wall 1 in a rotary movement along said wall and around the mixing vessel axis which includes an angle with the screw. Thescrew 3 is rotatable around anon-rotating screw shaft 6 through axial slide-thrust bearings 4 and a radial roller bearing 5. - The
screw shaft 6 has a clevis-shaped portion, which engages around a vertical connecting piece 7, a hinge pin 8 being provided in transverse direction through said parts. - The connecting piece 7 is secured, in a manner further to be described, to an inner bearing
sleeve 9 of a vertical rotary bearing which in the embodiment shown is constituted by twoconical roller bearings 10 which are radially enclosed by anouter bearing sleeve 11 and axially by aclosure ring 13, secured bybolts 12. - An annular
horizontal housing plate 15 is secured to the vessel bottom throughcolumns 14 which are equally spaced around the circumference, e.g. pipe lengths, which are welded to thevessel bottom 2. Asecond housing plate 16 is releasably secured against the under side of thefirst housing plate 15 and said second plate is welded byradial connecting strips 17 to theouter bearing sleeve 11 of the rotary bearing. - In the embodiment shown the
second plate 16 is connected to thefirst plate 15 by means of ahinge 18 having ahorizontal hinge pin 19. Spaced around itscircumference pins 20 foreye bolts 21 are provided on thelower plate 16, said bolts being pivotable around thepins 20 and the bolt shank of each of which may be placed vertically, as seen in figure 1, through radial recesses extending from the outer circumference of theplates plate 15 through anut 22 and awasher 23, whereby bothplates - The connecting piece 7 is secured to the
inner bearing sleeve 9 through acentral bolt 24, which extends from below through theclosure ring 13 and thesleeve 9 and is screwed into a threaded opening at the lower end of the connecting piece 7. In the embodiment shown a widenedhead 25 is connected to the bolt head through atransverse pin 26, extending radially through the widened head and the bolt head.Stud bolts 27, four in the embodiment shown, are screwed into corresponding threaded apertures of the widenedhead 25. When thebolt 24 has been screwed into the connecting piece 7, the connection may be tensioned by screwing home thestuds 27 which are in engagement with the lower side of theclosure ring 16 and thereby tension thebolt 24 through thehead 25. Thereby it is prevented that when screwing thebolts 24 in or out, the screw thread thereof or of the corresponding opening is damaged. - The
roller bearings 10 are sealed through acup ring seal 28 at the lower side of theouter bearing sleeve 11. - The rotary bearing is closed at its lower end by a
cover 29, which is secured to thesleeve 11 throughbolts 30. - A sphere part shaped
sealing element 32 is secured to the lower end of the screw throughbolts 31, around the lower end of thescrew shaft 6, at the position of the hinge pin 8. Said sphere part shaped element contains a large portion of a sphere and is provided in a corresponding opening in aring 33, which is secured in thevessel bottom 2 throughbolts 34. - As the sealing means a
packing 35 withpacking gland 36 and pressbolts 37 may serve, such as shown in the left portion of figure 1. The sealing means may also be constituted by a fluid or aerodynamic seal, constituted by two vertically spaceddiscs 38, which are mutually and relative to thesphere part element 35 biased by aspring 39 engaged around abolt 40 secured in theupper element 38, a plurality of which are provided spaced around the circumference. Through one ormore apertures 41 air having a predetermined pressure may be supplied between theelements 38. - In order to demount the structure, e.g. for the replacement of the
packing 35 or of thesphere part element 32, the following steps are taken. - The
bottom cover 29 is removed by removing thebolts 30, whereby thebolts 27 may be released so that the tension in the connection between thebolt 24 and the connection piece 7 is removed. Thereafter thebolt 24 may be unscrewed by hand and may be taken out. Subsequently thenuts 22 of theeye bolts 21 are released so far that thebolts 21 may be pivoted around thepivot pins 20. Prior to pivoting the last bolt, the second orlower plate 16 of the housing is retained in position through the handle 17' and thereafter the lower plate may be pivoted around thehinge pin 19 together with the rotary bearing 9 -11 secured therein. Then theplate 16 may be released and is vertically suspended. If necessary, replacement of theroller bearings 10 or of the seals for the rotary bearing is now easy. - Furthermore the
packing gland 36 is now accessible from the under side through the central opening in the annular first orupper plate 15 of the housing, so that thebolts 37 thereof may be taken out, said bolts being also accessible from the side between thecolumns 14. After removal of thepacking gland 36 thepacking 35 may be replaced. In the embodiment shown in the right part of figure 1, provided with the fluid seal, thesprings 39 may be removed from thebolts 40, whereafter thelower ring 38 may be removed and the 0-ring, provided thereon and not indicated by a reference number, may be replaced. Also through an inspection door (not shown) provided in such a mixing apparatus in the wall 1 adjacent to thebottom 2, thesphere part element 32 may be released from thescrew shaft 6 and removed through releasing thebolts 34, whereafter thering 33 may be taken out. - Remounting may be established by taking the above mentioned steps in reverse order.
Claims (8)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85201905T ATE40654T1 (en) | 1985-11-18 | 1985-11-18 | MIXING DEVICE WITH MIXING AUGER AND CONICAL CONTAINER. |
DE8585201905T DE3568141D1 (en) | 1985-11-18 | 1985-11-18 | Mixing apparatus having a mixing screw and a conical mixing vessel |
EP85201905A EP0222933B1 (en) | 1985-11-18 | 1985-11-18 | Mixing apparatus having a mixing screw and a conical mixing vessel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP85201905A EP0222933B1 (en) | 1985-11-18 | 1985-11-18 | Mixing apparatus having a mixing screw and a conical mixing vessel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0222933A1 EP0222933A1 (en) | 1987-05-27 |
EP0222933B1 true EP0222933B1 (en) | 1989-02-08 |
Family
ID=8194084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85201905A Expired EP0222933B1 (en) | 1985-11-18 | 1985-11-18 | Mixing apparatus having a mixing screw and a conical mixing vessel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0222933B1 (en) |
AT (1) | ATE40654T1 (en) |
DE (1) | DE3568141D1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU621054B2 (en) * | 1987-06-25 | 1992-03-05 | Dundee Trading Company Pty. Ltd. | Improved mixing machine |
GB2206813B (en) * | 1987-06-25 | 1991-09-25 | Dundee Trading Company Pty Ltd | Food processing apparatus |
US20020181325A1 (en) | 2001-06-05 | 2002-12-05 | Engel David J | Mixer seal and bearing apparatus and method |
US6715913B2 (en) * | 2002-03-29 | 2004-04-06 | Spx Corporation | Shaft bearing support method and apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1906016A1 (en) * | 1969-02-07 | 1970-08-20 | Gewerk Eisenhuette Westfalia | Changing slide-ring seals of vertical stirrer - shaft |
BE757618A (en) * | 1969-11-07 | 1971-04-01 | Fries Sohn Fa J S | BALL JOINT EQUIPPED WITH AN INTERNAL CROSS-BODY COUPLING |
DD110768A1 (en) * | 1974-04-08 | 1975-01-12 | ||
DE3245935A1 (en) * | 1982-12-11 | 1984-06-14 | Sen Alfred Bolz | CONE SCREW MIXER |
-
1985
- 1985-11-18 EP EP85201905A patent/EP0222933B1/en not_active Expired
- 1985-11-18 AT AT85201905T patent/ATE40654T1/en not_active IP Right Cessation
- 1985-11-18 DE DE8585201905T patent/DE3568141D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3568141D1 (en) | 1989-03-16 |
ATE40654T1 (en) | 1989-02-15 |
EP0222933A1 (en) | 1987-05-27 |
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