CA2193871A1 - Elongated press for press material mats - Google Patents
Elongated press for press material matsInfo
- Publication number
- CA2193871A1 CA2193871A1 CA002193871A CA2193871A CA2193871A1 CA 2193871 A1 CA2193871 A1 CA 2193871A1 CA 002193871 A CA002193871 A CA 002193871A CA 2193871 A CA2193871 A CA 2193871A CA 2193871 A1 CA2193871 A1 CA 2193871A1
- Authority
- CA
- Canada
- Prior art keywords
- press
- cylinders
- press plate
- service
- plate
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
- B30B1/323—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure using low pressure long stroke opening and closing means, and high pressure short stroke cylinder means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
- B30B1/34—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure involving a plurality of plungers acting on the platen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
- B29L2031/7092—Conveyor belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
- B29L2031/7094—Driving belts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Press Drives And Press Lines (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Abstract
An elongated press includes upper and lower heated press plates as well as a plurality of spaced apart, parallel press frames aligned in longitudinal direction of the press and interconnected to a press base frame. One of the press plates is vertically reciprocatable. The movable press plate is associated with short stroke working cylinders which are aligned in longitudinal and transverse direction of the press plate and are each connected to one of the press frames. Long stroke service cylinders are provided at the input and output ends of the movable press plate which are connected to the press base frame and by way of which the movable press plate can be moved to the service position in which it can be locked.
Description
'_ 2193871 ELONGATED PRESS FOR PRESS MATERIAL MATS
The invention relates to elongated presses for the compressing of press material mats, especially for the manufacture of wood particle boards and for the vulcanization of conveyor belts.
Conventional presses of this type have upper and lower heated press plates and a plurality of press frames which extend therearound, are aligned in longitudinal direction of the press and are connected to form a base frame. One of the press plates is vertically reciprocatable by a plurality of working cylinders which are positioned in the press frames.
The length of such presses is, for example, 15 to 20 m. If the press is used for the manufacture of wood based materials, it is provided with the conventional feeding and removal arrangements for the press material mats and the finished particle boards, for example, in the form of a continuous transport belt which is guided through the press. A press for the vulcanization of conveyor belts is constructed similarly.
In the conventional presses, the working cylinders are long stroke cylinders. The stroke between the press plates which is needed for feeding of the uncompressed materials and removal of the pressed product is relatively short, for example, 10 cm, and often only 10 mm are sufficient. This would not require long stroke cylinders. However, for service reasons a long stroke is required to move the press plates sufficiently apart to allow full access thereto, for which the long stroke cylinders are used. The service stroke is, for example, 40 cm. The resulting costs for this hydraulic arrangement are high.
It is now an object of the present invention to provide a simplified press of the above described type with a more economical hydraulic arrangement and especially the working cylinder arrangement.
This is achieved in accordance with the invention by using working cylinders which are short stroke cylinders and the pistons of which act on the movable press plate, the service stroke being achieved by separate service cylinders provided at the input and output ends of the movable press plate.
Accordingly, the invention provides an elongated press with upper and lower heated press plates, a plurality of spaced apart parallel press frames extending therearound which are aligned in longitudinal direction of the press and are connected to form a press base frame, a plurality of short stroke working cylinders for vertically reciprocating at least one of the press plates, the working cylinders being positioned in the press frames and aligned in longitudinal and transverse direction of the movable press plate, long stroke service cylinders for reciprocating the movable press plate from a working position to a service position and for locking the plate therein, the service cylinders being positioned at input and output ends of the movable press plate, which long stroke cylinders are mounted to the press base frame. The combination of the short stroke cylinders and long stroke cylinders of the present invention replaces the corresponding long stroke cylinder arrangements of the prior art. The movable press plate can be moved into the service position in several different ways as will be further discussed below.
The long stroke cylinders can act directly or indirectly on the movable press plate.
In a preferred embodiment, service cylinders are also provided in the middle section of the press, for example, in such a way that the length of the movable press plate is divided into equal thirds, whereby the service cylinders are positioned along the edge of the press plate. The movable press plate can be locked in the service position in several different ways. In the preferred embodiment, in accordance with the invention, the service cylinders are combined with cylinder operated lever systems with hooks for locking the movable press plate in the service position. However, the movable press plate, once in the service position, can also be locked by supporting or spacer elements or locked by hydraulically blocking movement of the long stroke cylinders after they have lifted the upper press plate into the service position.
The movable press plate is preferably the upper press plate.
In one embodiment, wherein the upper press plate is vertically reciprocatable, an upper, cylinder portion of each short stroke working cylinder is rigidly affixed to an upper cross beam of one of the press frames and a lower, piston portion of the working cylinders acts on the upper press plate through intermediate, interconnected, comb-shaped press force transmitting spacer elements. The spacer elements are movably guided in the respectively associated press frame and are connected to a drive arrangement for displacement thereof in longitudinal direction of the press and into the intermediate space between the press frames and back into the press frames.
, 219387I
The service position of the upper press plate thereby can be reached when the force transmitting elements are in the intermediate space allowing displacement of the movable press plate for an additional distance corresponding to a height of the spacer elements. In that embodiment, it is preferred to use the above described lever systems.
In another embodiment, the short stroke working cylinders are connected to cross beams which are vertically reciprocatable in the press frames and on which the long stroke service cylinders act, whereby the service cylinders are mounted between the cross beam and the base frame. In that embodiment, the service position can be adjusted by movement of the cross beam.
In a further preferred embodiment, the lower press plate is vertically reciprocatable, the short stroke working cylinders are rigidly affixed with their lower, cylinder portion to a lower cross beam of the press frames and the long stroke service cylinders are connected to the upper cross beam of the press frames. Interconnected comb-shaped press force transmitting spacer elements are positioned between the upper cross beam of the press frames and the upper press plate and are connected to a drive arrangement for movement of the spacer elements in longitudinal direction of the press from under the cross beam into the intermediate space between the press frames and back. The service position of the upper press plate is adjustable by moving the spacer elements into the intermediate space.
The invention is based on the discovery that the construction of the whole hydraulic system, including the working cylinders, can be simplified when different cylinder arrangements are used for the compression steps and for service, which arrangements are specific for their function, namely short stroke working cylinders for the pressing process and long stroke service cylinders for the service tasks.
The invention will be further described in the following by way of example only and with reference to the attached drawings, wherein Fig. 1 is a schematic side view of a press in accordance with the invention;
Fig. 2 is a cross-section taken along line A-A in Fig. 1 with different construction in the right and left halves of the drawing; and Fig. 3 is a preferred embodiment of the press as shown in Fig. 1.
The elongated press illustrated in Fig. 1 and 2 principally consists of an upper press portion 1 and a lower press portion 2. A plurality of press frames 4 are provided which are aligned in longitudinal direction of the press and are interconnected to a press base frame 3. The press frames 4 are constructed of pressed sheet steel, whereby respectively two sheet steel sections are placed opposite one another. The press includes a heatable lower press plate 5 which is stationary in the press frames 4 and a heated upper press plate 6 which is vertically reciprocatable in the press frames. The movable press plate 6 is provided with working cylinders in the form of short stroke cylinders 7 which are aligned in longitudinal and transverse direction of the press plate, which are otherwise connected to the press frames 4.
At the press material input and output ends of the movable press plate, service cylinder arrangements are provided in the form of long stroke cylinders 8 which are connected to the press base frame 3. The movable press plate 6 can be moved by way of the long stroke cylinders 8 to a sufficiently wide service position in which it can be locked. In the preferred embodiment of the invention as illustrated, the long stroke service cylinders are also provided in the middle section of the press, for example, in a manner which divides the length of the press into equal thirds. The short stroke cylinders 7 can have a stroke of 10 cm and the long stroke cylinders a stroke of about 40 cm.
It is apparent from Fig. 1 that the long stroke cylinders are combined with lever systems 10 with hook shaped ends 11 which are hydraulically operable by operating cylinders 9. With these lever systems 10 the movable press plate can be locked in the service position. This locked position by way of the lever system 10 is illustrated in the right half of Fig. 2.
Upon comparison of Fig 1 with the left half of Fig. 2, it becomes apparent that the upper, cylinder portion of the short stroke cylinders 7 is rigidly affixed to the upper cross beam 12 of the press frame 4. The lower, piston portion of the short stroke cylinders respectively acts on the upper press plate 6 through intermediate, interconnected press force transmitting spacer elements 13 which are comb shaped in side view and which are guided in the respectively associated press ., 2193871 frame 4. The spacer elements 13 are connected to a drive arrangement 14 for displacement thereof in longitudinal direction of the press. The elements are moved by the drive arrangement 14 into the intermediate space 15 between the press frames 4 and back into the press frames. The service position of the upper press plate 6 is thereby achievable when the spacer elements 13 are in the intermediate space 15.
In the press illustrated in Fig. 3, a lower, cylinder portion of the short stroke cylinders 7 is rigidly affixed to the lower cross beam of the press frames 4. The upper, piston portion acts on the lower press plate 5. The service cylinders 8 are connected to the upper cross beams 12 of the press frames 4. Force transmitting spacer elements 13 are provided between the upper cross beams 12 and the upper press plate 6 and are connected to a drive arrangement 18. The press force transmitting spacer elements 13 are displaceable in longitudinal direction of the press by way of the drive arrangement 18 and into the intermediate space 15 and back into the press frames 4. The service position of the upper press plate 6 is achieved by moving the press force transmitting elements into the intermediate space 15.
The invention relates to elongated presses for the compressing of press material mats, especially for the manufacture of wood particle boards and for the vulcanization of conveyor belts.
Conventional presses of this type have upper and lower heated press plates and a plurality of press frames which extend therearound, are aligned in longitudinal direction of the press and are connected to form a base frame. One of the press plates is vertically reciprocatable by a plurality of working cylinders which are positioned in the press frames.
The length of such presses is, for example, 15 to 20 m. If the press is used for the manufacture of wood based materials, it is provided with the conventional feeding and removal arrangements for the press material mats and the finished particle boards, for example, in the form of a continuous transport belt which is guided through the press. A press for the vulcanization of conveyor belts is constructed similarly.
In the conventional presses, the working cylinders are long stroke cylinders. The stroke between the press plates which is needed for feeding of the uncompressed materials and removal of the pressed product is relatively short, for example, 10 cm, and often only 10 mm are sufficient. This would not require long stroke cylinders. However, for service reasons a long stroke is required to move the press plates sufficiently apart to allow full access thereto, for which the long stroke cylinders are used. The service stroke is, for example, 40 cm. The resulting costs for this hydraulic arrangement are high.
It is now an object of the present invention to provide a simplified press of the above described type with a more economical hydraulic arrangement and especially the working cylinder arrangement.
This is achieved in accordance with the invention by using working cylinders which are short stroke cylinders and the pistons of which act on the movable press plate, the service stroke being achieved by separate service cylinders provided at the input and output ends of the movable press plate.
Accordingly, the invention provides an elongated press with upper and lower heated press plates, a plurality of spaced apart parallel press frames extending therearound which are aligned in longitudinal direction of the press and are connected to form a press base frame, a plurality of short stroke working cylinders for vertically reciprocating at least one of the press plates, the working cylinders being positioned in the press frames and aligned in longitudinal and transverse direction of the movable press plate, long stroke service cylinders for reciprocating the movable press plate from a working position to a service position and for locking the plate therein, the service cylinders being positioned at input and output ends of the movable press plate, which long stroke cylinders are mounted to the press base frame. The combination of the short stroke cylinders and long stroke cylinders of the present invention replaces the corresponding long stroke cylinder arrangements of the prior art. The movable press plate can be moved into the service position in several different ways as will be further discussed below.
The long stroke cylinders can act directly or indirectly on the movable press plate.
In a preferred embodiment, service cylinders are also provided in the middle section of the press, for example, in such a way that the length of the movable press plate is divided into equal thirds, whereby the service cylinders are positioned along the edge of the press plate. The movable press plate can be locked in the service position in several different ways. In the preferred embodiment, in accordance with the invention, the service cylinders are combined with cylinder operated lever systems with hooks for locking the movable press plate in the service position. However, the movable press plate, once in the service position, can also be locked by supporting or spacer elements or locked by hydraulically blocking movement of the long stroke cylinders after they have lifted the upper press plate into the service position.
The movable press plate is preferably the upper press plate.
In one embodiment, wherein the upper press plate is vertically reciprocatable, an upper, cylinder portion of each short stroke working cylinder is rigidly affixed to an upper cross beam of one of the press frames and a lower, piston portion of the working cylinders acts on the upper press plate through intermediate, interconnected, comb-shaped press force transmitting spacer elements. The spacer elements are movably guided in the respectively associated press frame and are connected to a drive arrangement for displacement thereof in longitudinal direction of the press and into the intermediate space between the press frames and back into the press frames.
, 219387I
The service position of the upper press plate thereby can be reached when the force transmitting elements are in the intermediate space allowing displacement of the movable press plate for an additional distance corresponding to a height of the spacer elements. In that embodiment, it is preferred to use the above described lever systems.
In another embodiment, the short stroke working cylinders are connected to cross beams which are vertically reciprocatable in the press frames and on which the long stroke service cylinders act, whereby the service cylinders are mounted between the cross beam and the base frame. In that embodiment, the service position can be adjusted by movement of the cross beam.
In a further preferred embodiment, the lower press plate is vertically reciprocatable, the short stroke working cylinders are rigidly affixed with their lower, cylinder portion to a lower cross beam of the press frames and the long stroke service cylinders are connected to the upper cross beam of the press frames. Interconnected comb-shaped press force transmitting spacer elements are positioned between the upper cross beam of the press frames and the upper press plate and are connected to a drive arrangement for movement of the spacer elements in longitudinal direction of the press from under the cross beam into the intermediate space between the press frames and back. The service position of the upper press plate is adjustable by moving the spacer elements into the intermediate space.
The invention is based on the discovery that the construction of the whole hydraulic system, including the working cylinders, can be simplified when different cylinder arrangements are used for the compression steps and for service, which arrangements are specific for their function, namely short stroke working cylinders for the pressing process and long stroke service cylinders for the service tasks.
The invention will be further described in the following by way of example only and with reference to the attached drawings, wherein Fig. 1 is a schematic side view of a press in accordance with the invention;
Fig. 2 is a cross-section taken along line A-A in Fig. 1 with different construction in the right and left halves of the drawing; and Fig. 3 is a preferred embodiment of the press as shown in Fig. 1.
The elongated press illustrated in Fig. 1 and 2 principally consists of an upper press portion 1 and a lower press portion 2. A plurality of press frames 4 are provided which are aligned in longitudinal direction of the press and are interconnected to a press base frame 3. The press frames 4 are constructed of pressed sheet steel, whereby respectively two sheet steel sections are placed opposite one another. The press includes a heatable lower press plate 5 which is stationary in the press frames 4 and a heated upper press plate 6 which is vertically reciprocatable in the press frames. The movable press plate 6 is provided with working cylinders in the form of short stroke cylinders 7 which are aligned in longitudinal and transverse direction of the press plate, which are otherwise connected to the press frames 4.
At the press material input and output ends of the movable press plate, service cylinder arrangements are provided in the form of long stroke cylinders 8 which are connected to the press base frame 3. The movable press plate 6 can be moved by way of the long stroke cylinders 8 to a sufficiently wide service position in which it can be locked. In the preferred embodiment of the invention as illustrated, the long stroke service cylinders are also provided in the middle section of the press, for example, in a manner which divides the length of the press into equal thirds. The short stroke cylinders 7 can have a stroke of 10 cm and the long stroke cylinders a stroke of about 40 cm.
It is apparent from Fig. 1 that the long stroke cylinders are combined with lever systems 10 with hook shaped ends 11 which are hydraulically operable by operating cylinders 9. With these lever systems 10 the movable press plate can be locked in the service position. This locked position by way of the lever system 10 is illustrated in the right half of Fig. 2.
Upon comparison of Fig 1 with the left half of Fig. 2, it becomes apparent that the upper, cylinder portion of the short stroke cylinders 7 is rigidly affixed to the upper cross beam 12 of the press frame 4. The lower, piston portion of the short stroke cylinders respectively acts on the upper press plate 6 through intermediate, interconnected press force transmitting spacer elements 13 which are comb shaped in side view and which are guided in the respectively associated press ., 2193871 frame 4. The spacer elements 13 are connected to a drive arrangement 14 for displacement thereof in longitudinal direction of the press. The elements are moved by the drive arrangement 14 into the intermediate space 15 between the press frames 4 and back into the press frames. The service position of the upper press plate 6 is thereby achievable when the spacer elements 13 are in the intermediate space 15.
In the press illustrated in Fig. 3, a lower, cylinder portion of the short stroke cylinders 7 is rigidly affixed to the lower cross beam of the press frames 4. The upper, piston portion acts on the lower press plate 5. The service cylinders 8 are connected to the upper cross beams 12 of the press frames 4. Force transmitting spacer elements 13 are provided between the upper cross beams 12 and the upper press plate 6 and are connected to a drive arrangement 18. The press force transmitting spacer elements 13 are displaceable in longitudinal direction of the press by way of the drive arrangement 18 and into the intermediate space 15 and back into the press frames 4. The service position of the upper press plate 6 is achieved by moving the press force transmitting elements into the intermediate space 15.
Claims (6)
1. An elongated press for compressing press material mats, comprising an upper heated press plate;
a lower heated press plate;
a plurality of spaced apart parallel press frames surrounding the press plates and aligned in longitudinal direction of the press and interconnected to form a press base frame, each press frame having upper and lower cross beams;
one of the press plates being vertically reciprocatable;
a plurality of short stroke working cylinders for vertically displacing the movable press plate, the cylinders being positioned in the press frames and being aligned in longitudinal and transverse direction of the movable press plate, one end of each working cylinder being affixed to one of the cross beams of an associated press frame; and long stroke service cylinders for moving the movable press plate to a service position sufficiently spaced from the other press plate, the service cylinders being affixed to the press base frame and being provided at input and output ends of the movable press plate.
a lower heated press plate;
a plurality of spaced apart parallel press frames surrounding the press plates and aligned in longitudinal direction of the press and interconnected to form a press base frame, each press frame having upper and lower cross beams;
one of the press plates being vertically reciprocatable;
a plurality of short stroke working cylinders for vertically displacing the movable press plate, the cylinders being positioned in the press frames and being aligned in longitudinal and transverse direction of the movable press plate, one end of each working cylinder being affixed to one of the cross beams of an associated press frame; and long stroke service cylinders for moving the movable press plate to a service position sufficiently spaced from the other press plate, the service cylinders being affixed to the press base frame and being provided at input and output ends of the movable press plate.
2. Press according to claim 1, wherein long stroke service cylinders are also provided in the middle section of the movable press plate and in a manner that the length of the press is divided into equal thirds.
3. Press according to claim 1 or 2, wherein the service cylinders are combined with hydraulically operable lever systems with hook shaped ends for locking the movable press plate in the service position.
4. Press according to claims 1 to 3, wherein an upper, cylinder portion of the short stroke cylinders is rigidly affixed to the upper cross beam of the respectively associated press frame and a lower piston portion of the short stroke cylinders acts on the movable press plate through intermediate, interconnected force transmitting spacer elements which are movably guided in the respectively associated press frame, the press further including a drive arrangement for moving the spacer elements from a position under the working cylinders into an intermediate space between the press frames and back, whereby the service position of the movable press plate is reached by moving the spacer elements into the intermediate space and lifting the movable press plate by way of the service cylinders.
5. Press according to claims 1 to 3, wherein the upper cross beams of the press frames is vertically reciprocatable and an upper, cylinder portion of the short stroke cylinders is rigidly affixed to the reciprocatable cross beam which is reciprocated by the long stroke cylinders which are supported on the press base frame, whereby the service position is achieved by upward displacement of the cross beam.
6. Press according to claims 1 to 3, wherein a lower, cylinder portion of the short stroke cylinders is rigidly affixed to the lower cross beam of the press frames and an upper, piston portion of the short stroke cylinders forces against the lower press plate, whereby the service cylinders are rigidly affixed to the upper cross beam of the press frames and the upper press plate, the press further including interconnected comb-shaped spacer elements which are positioned between the upper cross beam of the press frames and the upper press plate and are displaceable in longitudinal direction of the press plate, the press being provided with a drive arrangement for displacement of the spacers from under the cross beam into an intermediate space between the press frames and back, whereby the service position of the upper press plate is achieved by movement of the spacers into the intermediate space.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19549190.4 | 1995-12-30 | ||
| DE1995149190 DE19549190A1 (en) | 1995-12-30 | 1995-12-30 | Hydraulic long press with heated press plates for e.g. wooden sheet or vulcanising conveyor belts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2193871A1 true CA2193871A1 (en) | 1997-07-01 |
Family
ID=7781670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002193871A Abandoned CA2193871A1 (en) | 1995-12-30 | 1996-12-23 | Elongated press for press material mats |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1158291A (en) |
| CA (1) | CA2193871A1 (en) |
| DE (1) | DE19549190A1 (en) |
| IT (1) | IT1289493B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015223798A1 (en) * | 2015-11-30 | 2017-06-01 | Contitech Transportbandsysteme Gmbh | Device for producing a conveyor belt |
| CN106739099B (en) * | 2017-01-11 | 2018-04-13 | 洛阳理工学院 | A kind of forming roller for biomass two pairs of rollers extrusion forming |
| CN112092133A (en) * | 2020-08-27 | 2020-12-18 | 衡东县佳时鸿丰建材有限责任公司 | Manufacturing equipment for spiral stair beam and using method thereof |
-
1995
- 1995-12-30 DE DE1995149190 patent/DE19549190A1/en not_active Withdrawn
-
1996
- 1996-12-20 IT IT96MI002700 patent/IT1289493B1/en active IP Right Grant
- 1996-12-23 CA CA002193871A patent/CA2193871A1/en not_active Abandoned
- 1996-12-24 CN CN 96117964 patent/CN1158291A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI962700A1 (en) | 1998-06-20 |
| CN1158291A (en) | 1997-09-03 |
| DE19549190A1 (en) | 1997-07-03 |
| IT1289493B1 (en) | 1998-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |