CA1243203A - Apparatus for exchanging a pouring tube - Google Patents
Apparatus for exchanging a pouring tubeInfo
- Publication number
- CA1243203A CA1243203A CA000483733A CA483733A CA1243203A CA 1243203 A CA1243203 A CA 1243203A CA 000483733 A CA000483733 A CA 000483733A CA 483733 A CA483733 A CA 483733A CA 1243203 A CA1243203 A CA 1243203A
- Authority
- CA
- Canada
- Prior art keywords
- arm
- pouring tube
- bearing block
- vertical
- toggle joint
- 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
Abstract
ABSTRACT
Apparatus for exchanging a pouring tube in communication with the outlet valve of a metallurgical vessel includes a pivot arm which is mounted to pivot about a vertical axis and a hori-zontal axis. One end of the pivot arm carries a mounting for supporting the pouring tube and the other end cooperates with a toggle lever mechanism. A pivotally mounted actuating lever is positioned to contact the toggle lever mechanism to exert a force on a spring assembly carried by the pivot arm and thus to exert a torque on the pivot arm about the horizontal axis.
Apparatus for exchanging a pouring tube in communication with the outlet valve of a metallurgical vessel includes a pivot arm which is mounted to pivot about a vertical axis and a hori-zontal axis. One end of the pivot arm carries a mounting for supporting the pouring tube and the other end cooperates with a toggle lever mechanism. A pivotally mounted actuating lever is positioned to contact the toggle lever mechanism to exert a force on a spring assembly carried by the pivot arm and thus to exert a torque on the pivot arm about the horizontal axis.
Description
~43~)3 Apparatus for exchan~_n~_a pourin~ tube The invention relates to an apparatus for exchangi.ng a pouring tube in communication with the outlet valve of a metallurgical vessel and is concerned with that type of such apparatus which has a pivot arm which is mounted to 5. pivot about vertical and horizontal axes and which at one end carries a mounting for supporting the pouring tube and whose other end cooperates with force exerting means arranged to press the pouring tube into contact with the outlet valve.
Such an apparatus is disclosed in British Patent 10. No. 1157818 in which a threaded bolt is secured to the floor of the metallurgical vessel and serves as a vertical pivotal axis. The bolt rotatably carries a bifurcated threaded sleeve which carries the pivot arm on a pivotal shaft about which the arm may tilt horizontall.y which in turn carries the 15. pouring tube. The pivot arm is also connected to the vessel floor via a clamping lock on which the tilting movement Eor moving the pouring tube towards or away from the vessel outlet is performed which is in no way appropriate to modern day operational requirements because the handling 20. of a elamping lock, particularly in moments of danger, is mueh too complicated. Furthermore,tilting of the pouring tube cannot be avoided when pressing the pouring tube in contact with the vessel outlet. There is also the danger that if one over-tightens the clamping lock uncontrolled 25. forces may be exerted which can easily break some part of the apparatus. Finally, lateral pivoting of the pouring tube and the pivot arm is not possible without first releas-ing the clamping lock.
It is an object of the present invention to provide an 30- improved apparatus which may be more simply and rapidly used ~2~2~;3 -~ 23843-140 and ensures that the pouring tube may be reliably pressed against the outlet valve.
According to the present invention there is provided an apparatus for use in replaceably mounting a pouring tube in engagement with a discharge nozzle of a vessel, said apparatus comprising an arm having a longitudinal axis;
means mounting said arm for pivotal movement about a vertical axis transverse to said longitudinal axis and for tilting movement about a horizontal axis transverse to said longitudinal axis;
a fixture on a first end of said arm for supporting a pouring tube, and operating means mounted adjacent a second end of said arm for tilting said arm about said horizontal axis between a clamping position, whereat a pouring tube supported by said fixture is pressed against a discharge nozzle of a vessel, and an open position, whereat the pouring tube is spaced from the discharge nozzle, and for enabling said arm when in said open ~0 position thereof to be pivoted about said vertical axis between a first position, whereat the pouring tube is aligned with the discharge nozzle, to a second position, whereat the pouring tube is spaced from the discharge nozzle and may be removed from said fixture, said operating means comprising a toggle joint movable between an expanded position and a buckled position, spring means coaxial with said toggle joint in said expanded position thereof and operable between said arm and said toggle joint for biasing ~ "
~32~ 23~43-140 -2a-said toggle joint to said buckled position thereof, and actuating means for moving said toggle join-t between said buckled position, whereat said arm pivots to said open position thereof, and said expanded position against the biasing force of said spring means to thereby pivot said arm to said clamping position thereof. The use of a toggle lever mechanism to move the pivot arm and to exert the necessary force on the pouring tube to press it against the outlet valve, means that a pouring tube can be exchanged both rapidly and safely and with only a few hand movements and in practice only two hand movements on the actuating member are necessary for this purpose. The use of a toggle lever cooperating with spring means is practicable for use in a crude steel works due to its simple but nevertheless effective construction, in particular because contamination does not impair its operation.
The use of spring means enables a uniform, resilient and safe force to be exerted on the pouring tube, pressing its sealing surface into contact with the opposing sealing surface of the outlet valve.
The toggle lever mechanism is conveniently carried by a mounting block adapted to be connected to the floor of the vessel and the spring means is carried by the pivot arm. In this event it is preferred that the actuating member is mounted to pivot on the mounting block about a fixed axis 3~)3 and the toggle lever mechanism preferably includes a member pivotally connected to the actuating member and to a pressure peg which is guided by the mourlting block to slide substantially vertically and which engages the 5. spring means. It is also preferred that the spring means includes a piston which is guided to move coaxially with the pressure peg and which is acted on by a spring which is supported by~an adjustable abutment. This latter feature enables the characteristics of the spring means to be 10. adjusted precisely to requirements whereby the pouring tube may be pressed against the outlet valve with precisely the required pressure.
The preferred embodiment of the invention includes a vertical shaft which is rotatably carried by the mounting 15. block and whose lower end is bifurcated and pivotally carries the pivot arm on a horizontal shaft. It is further preferred that the apparatus includes a releasable locking mechanism arranged to loc~ the vertical shaft in position with respect to the mounting block. This results not only 20. in a convenient arrangement of the pivot arm and its pivotal axes but also ensures that the pouring tube can be secured in its operational position without difficulty.
Further features and details of the invention will be apparent from the following description of one exemplary 25- embodiment which is given with reference to the accompanying drawings, in which:-Figure 1 is a sectional elevation of an intermediate vessel whose outlet is controlled by a sliding gate valve with the pouring tube changing apparatus adjacent to it;
30. Figure 2 is a view in the direction of the arrow A in Figure l;
Figure 3 is a side view onto the toggle lever joint of the apparatus on the line B-B in Figure l; and 3~
Figure 4 is a side~view of the apparatus of Figure l.
Figure l shows an inter~ediate vessel 3 which is not shown in detail with a ~sheet metal floor l and a refractory lining 2 for use in a co~tinuous casting installation. Steel 5. melt can be discharged ~r'om the vessel via flow opening 4 in an outlet brick 5 through a sliding gate valve 6(which is only schematically il-lustrated) into a pouring tube 8 connected to the outlet'-7'of the valve 6 and thence into an ingot mould (not shown) si~ftuated therebelow. The valve 6 lO. serves to permit, to con~rol and to stop the flow of molten metal through the inlet sleeve 9 in the outlet brick 5.
The pouring tube 8, which is subject to wear and is thus an exchangeable refractory'i~component, is sealingly connected to and held against the'~o~wer planar surface of the outlet 15- 7 with the aid-of a changinig apparatus. This apparatus includes a pivot arm ll càrrying a support sleeve lO adapted to support the pouring tu~el8, which arm is arranged to be horizontally rotatable about a vertical pin and vertically tiltable about a horizontal'shaft 13 which is carried by 20- the bifurcated end l4 of the pin 12. The pin 12 is mounted in a mounting block 16 secured to a mounting plate 18 of the vessel floor l by means of screws 15. The support sleeve lO is supported on gimbals on the pivot arm ll and one axis l9 of the two'Cardan axes l9 and 20 is also 25. the axis of the connection with the pivo-t arm ll.
- The reaction force to the weight of the pivot arm ll on the pouring tube side acting about the shaft 13 and to the force with which the-~pouring tube 8 is pressed against the outlet is exerted by a ~oggle lever joint 21 which is carried by the mounting block 16 and acts on a spring buffer 22 carried within the pivot arm ll on the other side .
Such an apparatus is disclosed in British Patent 10. No. 1157818 in which a threaded bolt is secured to the floor of the metallurgical vessel and serves as a vertical pivotal axis. The bolt rotatably carries a bifurcated threaded sleeve which carries the pivot arm on a pivotal shaft about which the arm may tilt horizontall.y which in turn carries the 15. pouring tube. The pivot arm is also connected to the vessel floor via a clamping lock on which the tilting movement Eor moving the pouring tube towards or away from the vessel outlet is performed which is in no way appropriate to modern day operational requirements because the handling 20. of a elamping lock, particularly in moments of danger, is mueh too complicated. Furthermore,tilting of the pouring tube cannot be avoided when pressing the pouring tube in contact with the vessel outlet. There is also the danger that if one over-tightens the clamping lock uncontrolled 25. forces may be exerted which can easily break some part of the apparatus. Finally, lateral pivoting of the pouring tube and the pivot arm is not possible without first releas-ing the clamping lock.
It is an object of the present invention to provide an 30- improved apparatus which may be more simply and rapidly used ~2~2~;3 -~ 23843-140 and ensures that the pouring tube may be reliably pressed against the outlet valve.
According to the present invention there is provided an apparatus for use in replaceably mounting a pouring tube in engagement with a discharge nozzle of a vessel, said apparatus comprising an arm having a longitudinal axis;
means mounting said arm for pivotal movement about a vertical axis transverse to said longitudinal axis and for tilting movement about a horizontal axis transverse to said longitudinal axis;
a fixture on a first end of said arm for supporting a pouring tube, and operating means mounted adjacent a second end of said arm for tilting said arm about said horizontal axis between a clamping position, whereat a pouring tube supported by said fixture is pressed against a discharge nozzle of a vessel, and an open position, whereat the pouring tube is spaced from the discharge nozzle, and for enabling said arm when in said open ~0 position thereof to be pivoted about said vertical axis between a first position, whereat the pouring tube is aligned with the discharge nozzle, to a second position, whereat the pouring tube is spaced from the discharge nozzle and may be removed from said fixture, said operating means comprising a toggle joint movable between an expanded position and a buckled position, spring means coaxial with said toggle joint in said expanded position thereof and operable between said arm and said toggle joint for biasing ~ "
~32~ 23~43-140 -2a-said toggle joint to said buckled position thereof, and actuating means for moving said toggle join-t between said buckled position, whereat said arm pivots to said open position thereof, and said expanded position against the biasing force of said spring means to thereby pivot said arm to said clamping position thereof. The use of a toggle lever mechanism to move the pivot arm and to exert the necessary force on the pouring tube to press it against the outlet valve, means that a pouring tube can be exchanged both rapidly and safely and with only a few hand movements and in practice only two hand movements on the actuating member are necessary for this purpose. The use of a toggle lever cooperating with spring means is practicable for use in a crude steel works due to its simple but nevertheless effective construction, in particular because contamination does not impair its operation.
The use of spring means enables a uniform, resilient and safe force to be exerted on the pouring tube, pressing its sealing surface into contact with the opposing sealing surface of the outlet valve.
The toggle lever mechanism is conveniently carried by a mounting block adapted to be connected to the floor of the vessel and the spring means is carried by the pivot arm. In this event it is preferred that the actuating member is mounted to pivot on the mounting block about a fixed axis 3~)3 and the toggle lever mechanism preferably includes a member pivotally connected to the actuating member and to a pressure peg which is guided by the mourlting block to slide substantially vertically and which engages the 5. spring means. It is also preferred that the spring means includes a piston which is guided to move coaxially with the pressure peg and which is acted on by a spring which is supported by~an adjustable abutment. This latter feature enables the characteristics of the spring means to be 10. adjusted precisely to requirements whereby the pouring tube may be pressed against the outlet valve with precisely the required pressure.
The preferred embodiment of the invention includes a vertical shaft which is rotatably carried by the mounting 15. block and whose lower end is bifurcated and pivotally carries the pivot arm on a horizontal shaft. It is further preferred that the apparatus includes a releasable locking mechanism arranged to loc~ the vertical shaft in position with respect to the mounting block. This results not only 20. in a convenient arrangement of the pivot arm and its pivotal axes but also ensures that the pouring tube can be secured in its operational position without difficulty.
Further features and details of the invention will be apparent from the following description of one exemplary 25- embodiment which is given with reference to the accompanying drawings, in which:-Figure 1 is a sectional elevation of an intermediate vessel whose outlet is controlled by a sliding gate valve with the pouring tube changing apparatus adjacent to it;
30. Figure 2 is a view in the direction of the arrow A in Figure l;
Figure 3 is a side view onto the toggle lever joint of the apparatus on the line B-B in Figure l; and 3~
Figure 4 is a side~view of the apparatus of Figure l.
Figure l shows an inter~ediate vessel 3 which is not shown in detail with a ~sheet metal floor l and a refractory lining 2 for use in a co~tinuous casting installation. Steel 5. melt can be discharged ~r'om the vessel via flow opening 4 in an outlet brick 5 through a sliding gate valve 6(which is only schematically il-lustrated) into a pouring tube 8 connected to the outlet'-7'of the valve 6 and thence into an ingot mould (not shown) si~ftuated therebelow. The valve 6 lO. serves to permit, to con~rol and to stop the flow of molten metal through the inlet sleeve 9 in the outlet brick 5.
The pouring tube 8, which is subject to wear and is thus an exchangeable refractory'i~component, is sealingly connected to and held against the'~o~wer planar surface of the outlet 15- 7 with the aid-of a changinig apparatus. This apparatus includes a pivot arm ll càrrying a support sleeve lO adapted to support the pouring tu~el8, which arm is arranged to be horizontally rotatable about a vertical pin and vertically tiltable about a horizontal'shaft 13 which is carried by 20- the bifurcated end l4 of the pin 12. The pin 12 is mounted in a mounting block 16 secured to a mounting plate 18 of the vessel floor l by means of screws 15. The support sleeve lO is supported on gimbals on the pivot arm ll and one axis l9 of the two'Cardan axes l9 and 20 is also 25. the axis of the connection with the pivo-t arm ll.
- The reaction force to the weight of the pivot arm ll on the pouring tube side acting about the shaft 13 and to the force with which the-~pouring tube 8 is pressed against the outlet is exerted by a ~oggle lever joint 21 which is carried by the mounting block 16 and acts on a spring buffer 22 carried within the pivot arm ll on the other side .
2~1~
of the shaft 13. The joint 21, as may be seen in Figure 3, has an actuating member 24 which is pivoted at one end about a pi.n 23 carried by the bearing block 16 and has reces-ses 25 in its flanks which receive a member 27 comprising 5- two clips or fish plates held in position by means of a peg 26. The clip member 27 is for its part coupled by means of a coupling peg 29 to a pressure peg 30 which extends through a guide bore 31 in the mounting block 16. The spring buffer is a preassembled unit including a housing 33 which accommod-10. ates olate springs 34 supported by an adjustable threadedstop 35 and acting on a piston 32 which is engaged by the pressure pin 30.
In the position illustrated in Figure l,the toggle lever mechanism 21 is in the extended configuration and 15- locked in position by virtue of the fact that the actuating lever 24 has been rotated into the stressing position by means of a hand grip 36 in the form of a tube which has been slid over the lever 24~ In this position the pressure peg 30 exerts a force on the spring buffer 22 and thus also on the pivot arm 20. 11 about the shaft 13 and thus presses the pouring tube 8 against the outlet 7 of the valve 6. In the stressing position the pivot arm 11 is lat.erally locked by a locking rod 37 which is arranged in the mounting block 16 and which extends into a locking hole 38 in a flanqe 39 on the pin 12 and is located bv 25- an engagement member 40 on it in a locking recess 41 in the mounting block 16. A further such recess 42 is also provided in order to secure the locking rod 37 in the unlocked position in which the arm 11 carrying the pouring tube 8 may be pivoted laterally. By moving the hand grip 36 in the 30- direction of the arrow 44 the joint peg 26 is moved about the axis 23 and the togg]e lever mechanism is thereby unlocked ~43~
and the pressure peg 30 moved away from the spring buffer 22.
The pouring tube 8 is thus moved away from the outlet 7 and the pivot arm 11 moves downwardly and comes into engagement with an abutment 43 on the mounting block 16 and adopts the 5. position shown in Figure 1 in chain-dotted lines. This is effected with the valve 6 closed for the purpose of exchanging the pouring tube 8 subsequent to raising the intermediate vessel 3 to remove the pouring tube 8 from the ingot mould.
When the locking rod 37 is unlocked and the engagement member 10. 40 moved into the recess 42 the pivot arm 11 can be pivoted outwardly without difficulty about the pin 12 and the worn pouring tube 8 in the support sleeve 10 can be replaced.
Thereafter the pivot arm 11 is moved in again, laterally locked, pivoted about the axis 13 and clamped in position.
15. The mounting and demounting of the changing apparatus on the floor 1 of the vessel may be easily effected since the mounting block 16 with the toggle lever mechanism 21, pivot pin 12 and locking mechanism 37,38 and the pivot arm 11 with spring bufEer 22 and pouring tube mounting 10,19,20 form -two units 20. which may be simply handled and which may he used in confined spaces.
of the shaft 13. The joint 21, as may be seen in Figure 3, has an actuating member 24 which is pivoted at one end about a pi.n 23 carried by the bearing block 16 and has reces-ses 25 in its flanks which receive a member 27 comprising 5- two clips or fish plates held in position by means of a peg 26. The clip member 27 is for its part coupled by means of a coupling peg 29 to a pressure peg 30 which extends through a guide bore 31 in the mounting block 16. The spring buffer is a preassembled unit including a housing 33 which accommod-10. ates olate springs 34 supported by an adjustable threadedstop 35 and acting on a piston 32 which is engaged by the pressure pin 30.
In the position illustrated in Figure l,the toggle lever mechanism 21 is in the extended configuration and 15- locked in position by virtue of the fact that the actuating lever 24 has been rotated into the stressing position by means of a hand grip 36 in the form of a tube which has been slid over the lever 24~ In this position the pressure peg 30 exerts a force on the spring buffer 22 and thus also on the pivot arm 20. 11 about the shaft 13 and thus presses the pouring tube 8 against the outlet 7 of the valve 6. In the stressing position the pivot arm 11 is lat.erally locked by a locking rod 37 which is arranged in the mounting block 16 and which extends into a locking hole 38 in a flanqe 39 on the pin 12 and is located bv 25- an engagement member 40 on it in a locking recess 41 in the mounting block 16. A further such recess 42 is also provided in order to secure the locking rod 37 in the unlocked position in which the arm 11 carrying the pouring tube 8 may be pivoted laterally. By moving the hand grip 36 in the 30- direction of the arrow 44 the joint peg 26 is moved about the axis 23 and the togg]e lever mechanism is thereby unlocked ~43~
and the pressure peg 30 moved away from the spring buffer 22.
The pouring tube 8 is thus moved away from the outlet 7 and the pivot arm 11 moves downwardly and comes into engagement with an abutment 43 on the mounting block 16 and adopts the 5. position shown in Figure 1 in chain-dotted lines. This is effected with the valve 6 closed for the purpose of exchanging the pouring tube 8 subsequent to raising the intermediate vessel 3 to remove the pouring tube 8 from the ingot mould.
When the locking rod 37 is unlocked and the engagement member 10. 40 moved into the recess 42 the pivot arm 11 can be pivoted outwardly without difficulty about the pin 12 and the worn pouring tube 8 in the support sleeve 10 can be replaced.
Thereafter the pivot arm 11 is moved in again, laterally locked, pivoted about the axis 13 and clamped in position.
15. The mounting and demounting of the changing apparatus on the floor 1 of the vessel may be easily effected since the mounting block 16 with the toggle lever mechanism 21, pivot pin 12 and locking mechanism 37,38 and the pivot arm 11 with spring bufEer 22 and pouring tube mounting 10,19,20 form -two units 20. which may be simply handled and which may he used in confined spaces.
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for use in replaceably mounting a pouring tube in engagement with a discharge nozzle of a vessel, said apparatus comprising:
an arm having a longitudinal axis;
means mounting said arm for pivotal movement about a vertical axis transverse to said longitudinal axis and for tilting movement about a horizontal axis transverse to said longitudinal axis;
a fixture on a first end of said arm for supporting a pouring tube; and operating means mounted adjacent a second end of said arm for tilting said arm about said horizontal axis between a clamping position, whereat a pouring tube supported by said fixture is pressed against a discharge nozzle of a vessel, and an open position, whereat the pouring tube is spaced from the discharge nozzle, and for enabling said arm when in said open position thereof to be pivoted about said vertical axis between a first position, whereat the pouring tube is aligned with the discharge nozzle, to a second position, whereat the pouring tube is spaced from the discharge nozzle and may be removed from said fixture, said operating means comprising a toggle joint movable between an expanded position and a buckled position, spring means coaxial with said toggle joint in said expanded position thereof and operable between said arm and said toggle joint for biasing said toggle joint to said buckled position thereof, and actuating means for moving said toggle joint between said buckled position, whereat said arm pivots to said open position thereof, and said expanded position against the biasing force of said spring means to thereby pivot said arm to said clamping position thereof.
an arm having a longitudinal axis;
means mounting said arm for pivotal movement about a vertical axis transverse to said longitudinal axis and for tilting movement about a horizontal axis transverse to said longitudinal axis;
a fixture on a first end of said arm for supporting a pouring tube; and operating means mounted adjacent a second end of said arm for tilting said arm about said horizontal axis between a clamping position, whereat a pouring tube supported by said fixture is pressed against a discharge nozzle of a vessel, and an open position, whereat the pouring tube is spaced from the discharge nozzle, and for enabling said arm when in said open position thereof to be pivoted about said vertical axis between a first position, whereat the pouring tube is aligned with the discharge nozzle, to a second position, whereat the pouring tube is spaced from the discharge nozzle and may be removed from said fixture, said operating means comprising a toggle joint movable between an expanded position and a buckled position, spring means coaxial with said toggle joint in said expanded position thereof and operable between said arm and said toggle joint for biasing said toggle joint to said buckled position thereof, and actuating means for moving said toggle joint between said buckled position, whereat said arm pivots to said open position thereof, and said expanded position against the biasing force of said spring means to thereby pivot said arm to said clamping position thereof.
2. An apparatus as claimed in claim 1, further comprising a bearing block to be fixed to the vessel, said toggle joint being mounted on said bearing block, and wherein said spring means is mounted on said second end of said arm.
3. An apparatus as claimed in claim 2, wherein said actuating means comprises an actuating member pivotally mounted on said bearing block by a shaft, and said toggle joint comprises a pressure bolt mounted for vertical movement and acted on by said spring means, and a toggle member pivotally connected to said actuating member and said pressure bolt.
4. An apparatus as claimed in claim 3, wherein said pressure bolt is guided for vertical movement within said bearing block.
5. An apparatus as claimed in claim 3, wherein said spring means comprises a housing, a piston guided by said housing for vertical movement coaxially of said pressure bolt, and at least one spring within said housing and urging said piston toward said pressure bolt.
6. An apparatus as claimed in claim 5, further comprising abutment means supporting said spring and adjustable with respect to said housing to adjust the pressure between said piston and said pressure bolt.
7. An apparatus as claimed in claim 2, wherein said vertical axis comprises a vertical pin pivotally supported by said bearing block, and said horizontal axis comprises a horizontal pin pivotally supported by said vertical pin and pivotally supporting said arm.
8. An appartaus as claimed in claim 7, wherein said vertical pin has a lower forked end supporting said horizontal pin.
9. An apparatus as claimed in claim 7, further comprising detachable locking means for locking said vertical pin to said bearing block with said arm in said first position thereof.
10. An apparatus as claimed in claim 9, wherein said vertical pin includes a horizontal flange, and said locking means comprises an opening in said flange, and a bar slidably mounted in said bearing block for movement into said opening when said vertical pin is pivoted to move said arm to said first position thereof.
11. An appartaus as claimed in claim 10, wherein said locking means further comprises a locking notch in said bearing block, and a handle on said bar and movable into said locking notch when said bar extends into said opening.
12. An apparatus as claimed in claim 11, further comprising a second notch in said bearing block at a position to receive said handle when said bar is retracted from said opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000483733A CA1243203A (en) | 1985-06-12 | 1985-06-12 | Apparatus for exchanging a pouring tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000483733A CA1243203A (en) | 1985-06-12 | 1985-06-12 | Apparatus for exchanging a pouring tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1243203A true CA1243203A (en) | 1988-10-18 |
Family
ID=4130690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000483733A Expired CA1243203A (en) | 1985-06-12 | 1985-06-12 | Apparatus for exchanging a pouring tube |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1243203A (en) |
-
1985
- 1985-06-12 CA CA000483733A patent/CA1243203A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |