CN110538901A - Pipe bending device - Google Patents
Pipe bending device Download PDFInfo
- Publication number
- CN110538901A CN110538901A CN201910808461.4A CN201910808461A CN110538901A CN 110538901 A CN110538901 A CN 110538901A CN 201910808461 A CN201910808461 A CN 201910808461A CN 110538901 A CN110538901 A CN 110538901A
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- CN
- China
- Prior art keywords
- bending
- pipe
- elastic compression
- plate
- compression device
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
the invention relates to a pipe bending device, comprising: a fixed seat; the clamping and pushing device comprises a driving device arranged on the fixed seat and a transmission part connected with the driving device, and the transmission part is connected with the bending disc; the compression buffer device is arranged on one side of the bending disc and comprises a fixed platform, an elastic compression device and a pipe placing plate, wherein the fixed platform is arranged on the fixed seat, the pipe placing plate is arranged on the fixed platform, a groove matched with the elastic compression device is formed in the fixed platform, the elastic compression device is arranged in the groove, the elastic compression device protrudes out of the fixed platform in a natural state, the elastic compression device is compressed to the shortest length, and the elastic compression device contracts to be flush with the fixed platform. The invention utilizes the elastic compression device which can well play a role in buffering, protect the pipe and prevent the pipe from being extruded and deformed to generate defective products.
Description
Technical Field
The invention relates to the technical field of pipe machining equipment, in particular to a pipe bending device.
Background
When metal pipes such as reinforcing steel bars and the like are machined, bending operation is often encountered, and the existing bending equipment still has certain defects when the middle part of the pipe is bent, for example, when the pipe is bent, two sides of the bent part of the pipe are easily extruded and deformed, defective products are generated, and adverse effects are brought to the machining of the pipe.
Disclosure of Invention
The invention aims to provide a pipe bending device which can buffer and protect two sides of a pipe bending part during pipe bending processing so as to prevent defective products from being generated.
The scheme adopted by the invention for solving the technical problems is as follows:
a pipe bending apparatus comprising:
a fixed seat;
The clamping and pushing device comprises a driving device arranged on the fixed seat and a transmission part connected with the driving device, the transmission part is connected with the bending disc, and the driving device pushes the bending disc to do linear motion through the transmission part;
The compression buffering device is arranged on one side of the bending disc and has an interval between the bending disc and the bending disc, the compression buffering device comprises a fixing table arranged on the fixing seat, an elastic compression device and a pipe placing plate, wherein the elastic compression device is arranged towards the direction of the bending disc, the pipe placing plate is arranged on the fixing table, a groove matched with the elastic compression device is formed in the fixing table, the elastic compression device is arranged in the groove, the elastic compression device protrudes out of the fixing table in a natural state, the elastic compression device is compressed to the shortest length, the elastic compression device is contracted to be parallel and level with the fixing table, the height of the elastic compression device is set to be equal to the height of the elastic compression device, the pipe is placed on the pipe placing plate, the bending disc is used for bending the pipe, and the pipe is pressed on the elastic compression device under stress.
Further, the transmission component comprises a threaded rod connected with the output shaft of the driving device and a threaded sleeve in threaded connection with the threaded rod.
further, including on the fixing base vertical support plate and with the perpendicular horizontal bottom plate of connecting of vertical support plate, be provided with first guide bar perpendicularly in the vertical support plate and be located the second guide bar of first guide bar below, the cover is equipped with first stop collar on the first guide bar, the cover is equipped with the second stop collar on the second guide bar, first stop collar through first linking arm with the thread bush is connected, first linking arm through first connecting plate with the dish top of bending is connected, the second stop collar through the second linking arm with the thread bush is connected, the second linking arm through the second connecting rod with the dish bottom of bending is connected.
Furthermore, the longitudinal support plate is horizontally provided with two first guide rods and two second guide rods, the two first guide rods are arranged at the same height, and the two second guide rods are also arranged at the same height, so that the first connecting arm connected with the first limiting sleeves on the two first guide rods and the second connecting arm connected with the second limiting sleeves on the two second guide rods form an X-shaped structure on a longitudinal plane.
Furthermore, the bending disc is detachably connected with the first connecting plate and the second connecting plate.
The pipe bending machine further comprises a supporting table arranged on the fixed seat, a plurality of compression buffering devices corresponding to stress positions of the pipes when the pipes are bent are arranged on the supporting table, and a recovery hook used for receiving the pipes after the machining is finished is arranged on the side wall of the supporting table facing the bending plate.
further, the elastic compression device comprises a spring, a buffering head and a movable plate, wherein one end of the spring is arranged on the bottom surface of the groove, the buffering head is connected with the other end of the spring, the movable plate is fixedly connected with the buffering head, the movable plate is located in the groove, and when the spring is in a natural extension state, the movable plate protrudes out of the longitudinal side face of the fixed platform.
Furthermore, the buffering head faces the side face of the bottom face of the groove, the guide device is further arranged on the side face of the bottom face of the groove and comprises a push rod arranged on the buffering head and facing the side face of the bottom face of the groove, a limiting block vertically arranged with the push rod and a guide groove arranged on the bottom face of the groove, one end, far away from the buffering head, of the push rod penetrates through the spring and extends into the guide groove to be connected with the limiting block, the limiting block is located in the guide groove, and the size of the guide groove is set to enable the limiting block to be capable of linearly moving in the guide groove but cannot be separated from the guide groove.
further, the length of contraction of the spring from the natural extension state to the shortest length is equal to the thickness of the movable plate protruding out of the longitudinal side of the fixed table.
Further, the side of the movable plate, which deviates from the buffer head, is provided with an arc slope surface, and the slope of the arc slope surface gradually increases along with the approach of the atmosphere side.
Compared with the prior art, the invention has at least the following beneficial effects:
1) The elastic compression device is arranged, when the pipe is bent by the bending disc, the end stress point and the bending part of the pipe are pressed on the elastic compression device, and due to the existence of the spring, the elastic compression device can well play a role in buffering, protect the pipe and prevent the pipe from being extruded and deformed to generate defective products; in addition, the movable plate is provided with a slope, and the slope of the slope is gradually increased along with the approach of the atmosphere side, so that the pipe can be more attached to the slope when the pipe touches the movable plate during bending, and the buffering effect is better;
2) The invention is provided with a plurality of guide rods and connecting arms connected with the guide rods, the guide rods have a guide effect on the movement of the bending disk, and the connecting arms form an X-shaped structure on the longitudinal side surface, so that the structural design not only ensures the stability of the bending disk, prevents the bending disk from being influenced by unstable stress during bending, but also ensures the levelness of the movement of the bending disk in the process of pushing the bending disk to do linear movement by the threaded sleeve;
3) The bending disc is connected with the connecting plate through fasteners such as bolts, and the like, so that the bending disc can be conveniently mounted and dismounted, and the bending disc with the corresponding specification can be conveniently replaced when reinforcing steel bars with different bending degrees are machined.
drawings
Fig. 1 is a schematic structural diagram of a pipe bending apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a bending disk according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a compression buffering device according to an embodiment of the present invention;
FIG. 4 is a rear sectional view of a compression cushioning device in accordance with an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 3 at A;
Fig. 6 is a top view of a compression cushioning device according to an embodiment of the present invention.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
As shown in fig. 1, the present invention provides a pipe bending apparatus, which includes an L-shaped fixing base, a clamping pushing device disposed on the L-shaped fixing base, a bending plate 3 detachably disposed on the clamping pushing device, and a compression buffering device disposed on one side of the bending plate 3. The L-shaped fixing seat comprises a transverse bottom plate 100 and a longitudinal support plate 101 which is vertically connected with the transverse bottom plate 100. The clamping and pushing device comprises a driving device arranged on the transverse bottom plate 100 and a transmission component connected with the driving device. The driving device may include a servo motor 200, the servo motor 200 is fixed on a motor base 201, and the motor base 201 is fixed on the transverse bottom plate 100 through a plurality of i-shaped steel bars 202. The transmission part comprises a threaded rod 203 connected with an output shaft of the servo motor 200 and a threaded sleeve 204 sleeved on the threaded rod 203 and connected with the threaded rod 203 through threads.
in an embodiment of the present invention, two first guide rods 205 and two second guide rods 206 located below the first guide rods 205 are vertically disposed on the longitudinal support plate 101, the two first guide rods 205 are disposed at the same height, the two second guide rods 206 are also disposed at the same height, and the first guide rods 205 and the second guide rods 206 are disposed in one-to-one correspondence. Each first guide rod 205 is sleeved with a first limiting sleeve 207, and the first limiting sleeve 207 is connected with the threaded sleeve 204 through a first connecting arm 208; each second guide rod 206 is sleeved with a second stop collar 209, and the second stop collar 209 is connected with the threaded sleeve 204 through a second connecting arm 210, so that the first connecting arms 208 connected with the first stop collars 207 on the two first guide rods 205 and the second connecting arms 210 connected with the second stop collars 209 on the two second guide rods 206 form an X-shaped structure on a longitudinal plane (i.e. a plane perpendicular to the transverse bottom plate). Therefore, a triangle is formed between each two connecting arms and the guide rod, and the horizontal degree of the movement of the threaded sleeve 204 can be ensured by virtue of the stability of the triangle. Each first connecting arm 208 is further connected with a first connecting plate 211 arranged horizontally, each second connecting arm 210 is further connected with a second connecting plate 212 arranged horizontally, and the height difference between the first connecting plate 211 and the second connecting plate 212 is equivalent to the thickness of the bending disc 3. Referring to fig. 2, four threaded holes are formed in the center of the bending disk 3, the other end of the first connecting plate 211 is in contact connection with the top surface of the bending disk 3, the other end of the second connecting plate 212 is in contact connection with the bottom surface of the bending disk 3, and finally, fasteners such as bolts sequentially penetrate through the other end of the first connecting plate 211, the threaded holes in the bending disk 3 and the other end of the second connecting plate 212 so as to fix the bending disk 3 together with the first connecting plate 211 and the second connecting plate 212. The bending disk 3 is connected with the connecting plate through fasteners such as bolts, and the bending disk 3 is convenient to mount and dismount so as to replace the bending disk with corresponding specification when the pipes with different bending degrees are processed.
The compression buffer device is arranged on one side of the bending disk 3 and has a distance between the two. As shown in fig. 3, the compression buffer device includes a support table 400 fixed to the horizontal base plate 100, a fixing table 401 provided on the support table 400 through a mounting base 412, an elastic compression device provided toward the bending disk 3, and a tube placing plate 402 provided on the fixing table 401. Be provided with on the fixed station 401 with elasticity compression device complex recess 403, elasticity compression device sets up in recess 403 and elasticity compression device extrudees out the vertical side of fixed station 401 under natural state down, compresses elasticity compression device to the shortest, elasticity compression device shrink to with the fixed station parallel and level, wherein, elasticity compression device's height sets up to when placing tubular product on tubular product place board 402 and utilize bending dish 3 to bend the tubular product, the tubular product atress supports and presses on elasticity compression device. As shown in fig. 6, in order to facilitate the buffering of the stress point of the pipe during the bending process, two fixing tables 401 are disposed on the supporting table 400, the two fixing tables 401 are disposed corresponding to the stressed end and the bending portion of the pipe, and the elastic compression devices on the two fixing tables 401 are disposed opposite to each other with a distance therebetween so as to buffer the pipe.
In another embodiment of the present invention, referring to fig. 4 and 5, the elastic compression device includes a spring 404 having one end disposed on the bottom surface of the groove 403, a buffer head 405 connected to the other end of the spring 404, and a movable plate 406 fixedly connected to the buffer head 405, the movable plate 406 is disposed in the groove 403, and the movable plate 406 protrudes from the longitudinal side of the fixed stage 401 when the spring 404 is in a natural extension state. When the movable plate 406 is pressed, the spring 404 connected to the movable plate 406 contracts, and the movable plate 406 moves toward the bottom of the groove 403. In order to improve the stability of the contraction motion of the movable plate 406, a guide device is further disposed on the side of the buffer head 405 facing the bottom surface of the recess 403, and the guide device includes a push rod 407 disposed on the side of the buffer head 405 facing the bottom surface of the recess 403, a stopper 408 disposed perpendicular to the push rod 407, and a guide groove 409 disposed on the bottom surface of the recess 403. One end of the push rod 407, which is far away from the buffer head 405, extends into the guide groove 409 through the spring 404 to be connected with the limit block 408, and the limit block 408 is in contact connection with the side wall of the guide groove 409. In order to prevent the limiting block 408 from being disengaged from the guide groove 409, the guide groove 409 includes an opening section close to the bottom surface of the groove 403 and a groove body connected with the opening section, the length of the opening section in the vertical direction is smaller than the length of the groove body in the vertical direction and the length of the limiting block 408 in the vertical direction, and the length of the opening section in the vertical direction is not smaller than the length of the push rod 407 in the vertical direction, so that the push rod 407 can freely come in and go out in the guide groove 409, and the limiting block 408 cannot be disengaged from the guide groove 409. In order to prevent the movable plate 406 from causing additional damage to the pipe during the bending buffering, the spring 404 is compressed to the shortest length from the natural extension state to be equal to the thickness of the movable plate 406 protruding out of the longitudinal side of the fixed platform 401, so that the bent pipe can be buffered, and the compressed movable plate can be prevented from being protruded out of or recessed in the fixed platform 401 to cause force to act on the surface of the pipe to damage the pipe. In addition, in order to make tubular product can more laminate fly leaf 406 when bending, be provided with arc slope surface 410 on fly leaf 406 on the side that deviates from buffer head 405, and the slope of arc slope surface 410 increases along with being close to the atmosphere side gradually to make domatic structure that can laminate the tubular product surface, so that tubular product laminates the fly leaf more, be favorable to the protection to tubular product. In addition, a recovery hook 411 is provided on the side wall of the support table 400 facing the bending table 3, and the recovery hook 411 is hook-shaped and collects the bent tube.
When the pipe bending device of the present embodiment is applied, the bending disk 3 meeting the requirement of the bending degree is taken and fixedly connected to the two first connecting plates 211 and the two second connecting plates 212 by fasteners such as bolts. The servo motor 200 is started to work, the servo motor 200 drives the threaded rod 203 to rotate, the threaded rod 203 drives the threaded sleeve 204 on the threaded rod 203 to move close to the fixed table 401 in the rotating process, the threaded sleeve 204 drives the first connecting plate 211 and the second connecting plate 212 to push the bending disk 3 to move close to the fixed table 400, and due to the existence of the first guide rod 205 and the second guide rod 206, the threaded sleeve 204 can drive the bending disk 3 to stably move horizontally. When the bending disc 3 moves to a proper position, the servo motor 200 is turned off, the bending disc 3 is fixed, a pipe to be bent is taken at the moment, the pipe to be bent is placed on the pipe placing plate 402, the pipe is bent through the bending disc 3, when the pipe is bent, the end side of the stress of the pipe and the bending part are correspondingly pressed on the movable plate 406, the movable plate 406 is stressed and contracted to play a role in buffering and protecting the pipe, the generation of defective products is prevented, and after the bending is completed, the movable plate 406 returns to the initial position under the action of the spring 404. The processed pipe is pushed up to the recovery hook 411 from the pipe placing plate 402 and is recovered by the recovery hook. After all the pipes are processed, the servo motor 200 is started to rotate reversely to drive the threaded sleeve 204, the first connecting plate 211, the second connecting plate 212 and the bending disc 3 to move away from the fixed table, and the bending disc 3 is dismounted.
while the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. A tubing bending device, comprising:
A fixed seat;
The clamping and pushing device comprises a driving device arranged on the fixed seat and a transmission part connected with the driving device, the transmission part is connected with the bending disc, and the driving device pushes the bending disc to do linear motion through the transmission part;
The compression buffering device is arranged on one side of the bending disc and has an interval between the bending disc and the bending disc, the compression buffering device comprises a fixing table arranged on the fixing seat, an elastic compression device and a pipe placing plate, wherein the elastic compression device is arranged towards the direction of the bending disc, the pipe placing plate is arranged on the fixing table, a groove matched with the elastic compression device is formed in the fixing table, the elastic compression device is arranged in the groove, the elastic compression device protrudes out of the fixing table in a natural state, the elastic compression device is compressed to the shortest length, the elastic compression device is contracted to be parallel and level with the fixing table, the height of the elastic compression device is set to be equal to the height of the elastic compression device, the pipe is placed on the pipe placing plate, the bending disc is used for bending the pipe, and the pipe is pressed on the elastic compression device under stress.
2. The tube bending apparatus of claim 1, wherein the transmission member includes a threaded rod coupled to the output shaft of the drive device and a threaded sleeve threadedly coupled to the threaded rod.
3. The pipe bending device according to claim 2, wherein the fixing base includes a longitudinal support plate and a transverse bottom plate vertically connected to the longitudinal support plate, a first guide rod and a second guide rod are vertically disposed on the longitudinal support plate, the first guide rod is sleeved with a first limiting sleeve, the second guide rod is sleeved with a second limiting sleeve, the first limiting sleeve is connected to the threaded sleeve through a first connecting arm, the first connecting arm is connected to the top of the bending plate through a first connecting plate, the second limiting sleeve is connected to the threaded sleeve through a second connecting arm, and the second connecting arm is connected to the bottom of the bending plate through a second connecting rod.
4. the pipe bending apparatus according to claim 3, wherein two first guide rods and two second guide rods are horizontally disposed on the longitudinal support plate, the two first guide rods are disposed at the same height, and the two second guide rods are also disposed at the same height, so that the first connecting arm connected to the first position-limiting sleeves on the two first guide rods and the second connecting arm connected to the second position-limiting sleeves on the two second guide rods form an X-shaped structure on a longitudinal plane.
5. the tube bending apparatus according to claim 3, wherein the bending disk is detachably connected to the first connecting plate and the second connecting plate.
6. the pipe bending device according to claim 1, further comprising a support platform disposed on the fixing base, wherein the support platform is provided with a plurality of compression buffering devices corresponding to the stress positions on the pipe during bending, and a recovery hook for receiving the processed pipe is disposed on the side wall of the support platform facing the bending plate.
7. The pipe bending apparatus according to claim 1, wherein the elastic compression device comprises a spring having one end disposed on a bottom surface of the groove, a buffer head connected to the other end of the spring, and a movable plate fixedly connected to the buffer head, the movable plate being disposed in the groove and protruding from a longitudinal side of the fixed platen when the spring is in a natural extension state.
8. The pipe bending device according to claim 7, wherein a guide device is further arranged on a side surface of the buffer head facing the bottom surface of the groove, the guide device comprises a push rod arranged on the side surface of the buffer head facing the bottom surface of the groove, a limit block arranged perpendicular to the push rod, and a guide groove arranged on the bottom surface of the groove, one end of the push rod, which is far away from the buffer head, penetrates through the spring and extends into the guide groove to be connected with the limit block, the limit block is positioned in the guide groove, and the guide groove is sized such that the limit block can move linearly in the guide groove but cannot be disengaged from the guide groove.
9. The tube bending apparatus according to claim 8, wherein a contracted length of the spring from a naturally elongated state to being compressed to a minimum is equal to a thickness of the movable plate protruding from a longitudinal side of the stationary stage.
10. The pipe bending device according to claim 7, wherein an arc-shaped slope is provided on a side of the movable plate away from the buffer head, and the slope of the arc-shaped slope gradually increases as the movable plate approaches the atmosphere side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910808461.4A CN110538901A (en) | 2019-08-29 | 2019-08-29 | Pipe bending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910808461.4A CN110538901A (en) | 2019-08-29 | 2019-08-29 | Pipe bending device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110538901A true CN110538901A (en) | 2019-12-06 |
Family
ID=68710886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910808461.4A Withdrawn CN110538901A (en) | 2019-08-29 | 2019-08-29 | Pipe bending device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110538901A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU566653A1 (en) * | 1976-02-03 | 1977-07-30 | Московский Авиационный Технологический Институт Имени К.Э.Циолковского | Bending die set |
| CN204159702U (en) * | 2014-08-29 | 2015-02-18 | 天津市裕盛液压机械有限公司 | A kind of hydraulic pipe bender |
| CN109433874A (en) * | 2018-12-17 | 2019-03-08 | 兴化市春达铜业有限公司 | A kind of copper pipe continuous bending device with material-discharging ejection device |
| CN208680248U (en) * | 2018-05-21 | 2019-04-02 | 长春雄伟汽车零部件有限公司 | A kind of slow pressure type cold punching pressure device |
| CN208825268U (en) * | 2018-09-19 | 2019-05-07 | 北京星光俊海汽车配件有限公司 | Bending machine is used in a kind of processing of automotive headrest bar |
| CN209006449U (en) * | 2018-10-10 | 2019-06-21 | 河北三安车业有限公司 | A kind of assistant board pressure molding equipment of arc |
| CN210586555U (en) * | 2019-07-21 | 2020-05-22 | 苏州雷克斯金属制品有限公司 | Bending device |
-
2019
- 2019-08-29 CN CN201910808461.4A patent/CN110538901A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU566653A1 (en) * | 1976-02-03 | 1977-07-30 | Московский Авиационный Технологический Институт Имени К.Э.Циолковского | Bending die set |
| CN204159702U (en) * | 2014-08-29 | 2015-02-18 | 天津市裕盛液压机械有限公司 | A kind of hydraulic pipe bender |
| CN208680248U (en) * | 2018-05-21 | 2019-04-02 | 长春雄伟汽车零部件有限公司 | A kind of slow pressure type cold punching pressure device |
| CN208825268U (en) * | 2018-09-19 | 2019-05-07 | 北京星光俊海汽车配件有限公司 | Bending machine is used in a kind of processing of automotive headrest bar |
| CN209006449U (en) * | 2018-10-10 | 2019-06-21 | 河北三安车业有限公司 | A kind of assistant board pressure molding equipment of arc |
| CN109433874A (en) * | 2018-12-17 | 2019-03-08 | 兴化市春达铜业有限公司 | A kind of copper pipe continuous bending device with material-discharging ejection device |
| CN210586555U (en) * | 2019-07-21 | 2020-05-22 | 苏州雷克斯金属制品有限公司 | Bending device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20191206 |
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| WW01 | Invention patent application withdrawn after publication |