CN202388160U - Automatic tracking full-seam rolling welding/cutting mechanical hand - Google Patents
Automatic tracking full-seam rolling welding/cutting mechanical hand Download PDFInfo
- Publication number
- CN202388160U CN202388160U CN2011205616416U CN201120561641U CN202388160U CN 202388160 U CN202388160 U CN 202388160U CN 2011205616416 U CN2011205616416 U CN 2011205616416U CN 201120561641 U CN201120561641 U CN 201120561641U CN 202388160 U CN202388160 U CN 202388160U
- Authority
- CN
- China
- Prior art keywords
- welded
- slide
- welding
- cantilever
- workpiece
- 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 - Lifetime
Links
Images
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The utility model belongs to the technical field of a welding machine and relates to an automatic tracking full-seam rolling welding/cutting mechanical hand. A base is provided with a slide plate which transversely moves along the base; a compression spring is arranged between the slide plate and the base; the slide plate is provided with a slide platform which can longitudinally move along the slide plate; another compression spring is arranged between the slide plate and the slide platform; the slide platform is provided with a cantilever; a rolling wheel which can roll along a circular seam of a workpiece to be welded is arranged on one side of the outer end part of the cantilever; a welding gun head is arranged on the cantilever on one side of the rolling wheel; a central connecting line between the welding gun head and the rolling wheel is parallel to the central line of the cantilever in the length direction; and a pressing block or a pressing wheel for pressing one side or an outer layer welding piece is arranged on one side of the central connecting line between the welding gun head and the rolling wheel. The automatic tracking full-seam rolling welding/cutting mechanical hand has the technical effects of simple structure, low production cost, and convenience for installation, maintenance and use; and the automatic tracking full-seam rolling welding/cutting mechanical hand can automatically track a welding line track to movably weld, the welding quality is high and the device is suitable for carrying out rolling welding on the circular welding seam.
Description
Technical field
The utility model belongs to welding auxiliary equipment technical field, refers in particular to a kind ofly to stitch roll welding/cutting mechanics hand entirely from motion tracking.
Background technology
At present; Welding method to the non-standard circumferential weld on the circular metal tank body in the society roughly has two kinds: a kind of is general formula: when welding same model, be fixed to the position that is suitable for girth weld to gun rack earlier, change arc welding gun head by the welder according to the track of seam; Weak point: the tank body rotating speed is fast; The eye hand is difficult to synchronously, and welding effect is undesirable, and waste product is many, gas leakage is many (leaking gas but weld the bad commissure of part repair welding that causes), time-consuming; When particularly thin material welds, higher to welder's specification requirement; Another kind is the laser positioning welding robot: need the scan edge limit to move arc welding gun head by computer control, weak point is complex structure, production equipment cost high (every needs more than 20 ten thousand yuan), and operation easier is big, maintenance difficult.
Summary of the invention
The purpose of the utility model provides a kind of simple in structure, processing ease, the use energy is few, production cost is low stitches roll welding/cutting mechanics hand entirely from motion tracking.
The purpose of the utility model is achieved in that
Stitch roll welding/cutting mechanics hand entirely from motion tracking; Base is provided with the slide plate that laterally moves along base; Be provided with holddown spring between slide plate and the base, slide plate is provided with the slide unit that vertically moves along slide plate, is provided with holddown spring between slide plate and the slide unit; Slide unit is provided with cantilever; One side of cantilever outer end is provided with the roller that rolls along the circumferential weld of workpiece to be welded, and arc welding gun head or burner head or cutter sweep are arranged on the cantilever of forward and backward side or left and right side of roller, and a side of arc welding gun head or burner head or cutter sweep is provided with briquetting or the pinch roller of pushing down seam one side or outer weldment.
Above-mentioned jib-length can be adjusted, and described adjustment is through pneumatic adjustment or electronic adjustment or manual adjustment.
Above-mentioned cantilever is the bushing type cantilever, carries out the total length adjustment of cantilever between the internal and external casing through ACTUATOR or motor or latch.
Above-mentioned slide plate with respect to horizontal the moving of base is: the upper surface of base is provided with slideway or slide; The lower surface of slide plate is provided with the slide rail or the slide bar that can on the slideway of base or slide, slide, and base is provided with and drives the retreat cylinder of slide plate away from workpiece to be welded.
Above-mentioned slide unit vertically moves with respect to slide plate: the upper surface of slide plate is provided with slideway or slide; The lower surface of slide unit is provided with the slide rail or the slide bar that can on the slideway of slide plate or slide, slide; Slide plate is provided with the location-plate that is positioned on the slide unit upper surface; Location-plate is provided with brake cylinder, the brake cylinder piston rod stretch out or indentation can realize the mutual location of slide unit and location-plate and moves.
The wheel pressing shaft of above-mentioned pinch roller is hinged on the pinch roller axle bed, and the pinch roller axle bed is connected on the cantilever.
Above-mentioned pinch roller axle bed is slidingly connected on the cantilever through guide rod, and the guide rod between pinch roller axle bed and the cantilever is provided with spring, and flexible elastic force is adjustable through the nut that is screwed onto the guide rod top.
One side of above-mentioned base is provided with workpiece support to be welded; Described workpiece support to be welded is: two of support base plate is respectively arranged with fixed board and mobile riser; The inboard of fixed board and mobile riser all is hinged with work piece holder to be welded; The support base plate in the fixed board outside is provided with the power set of the work piece holder rotation to be welded that drives this side; The support base plate that moves the riser outside is provided with riser, is provided with between riser and the mobile riser to drive to move the cylinder that riser clamped or unclamped workpiece to be welded, is provided with work supporting block to be welded between two work piece holders to be welded.
Be respectively arranged with in the process that clamps workpiece to be welded workpiece to be welded on the opposite face of two above-mentioned work piece holders to be welded along its inclined-plane that upwards slides, the axis of the to be welded workpiece of workpiece to be welded after work piece holder to be welded clamps workpiece to be welded is higher than the axis of the to be welded workpiece of workpiece to be welded on work supporting block to be welded the time.
Going to the bottom of above-mentioned mobile riser is provided with roller.
The utility model is compared the outstanding and beneficial technical effects of prior art:
1, the utility model is without computer or computer chip control, installation, maintenance and easy to use.
2, the roller on the cantilever of the utility model can and change and the automatic ranging tracking up and down with change or front and back change about seam; Zero error, and then the drive arc welding gun head moves the welding quality height always along seam track; Even if not rectifying of weldment dress do not influence welding quality yet; Can be according to requirement of products; Horizontal level through adjustment arc welding gun head and roller; And then the position and the ratio that reach butt welded seam carry out freely distributing; Manufacturer for tank body or cylindrical shell does not need the abutment joint place to carry out the side cut of standard behind drawing and forming, can satisfy the demand of welding sequence, is the saving 2-3 of the manufacturer procedure of tank body or cylindrical shell.
3, the utility model when roller when the initial weld seam, through the fixedly slide unit that brakes, stop the roller move left and right, can climb on the weld seam, accomplish welding to full seam.
4, use N the utility model once to accomplish welding to the N bar seam on single tank body or the single cylindrical shell simultaneously.
5, a people can operate the multiple devices of the utility model, and the common laborer can operate, and can learn in ten minutes.
6, the utility model is simple in structure, and production cost is low, and power consumption is few, and automaticity is high, under the situation of non-artificial destruction, and the overlength in service life of the utility model.
7, the scope of application is: but be suitable for utilizing the welding machine of continuous weldings such as carbon dioxide welding machine, gas shielded welding machine, submerged arc welding machine, argon arc welding machine that girth joint is carried out continuous full seam roll welding; Seam can be the girth joint of off-gauge metalworks such as stepped ramp type or grooved; Simultaneously, can cut standard or non-standard cylindrical shell and oval cylindrical shell.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is that the A-A of Fig. 1 is to cutaway view.
Fig. 3 is that the B-B of Fig. 1 is to cutaway view.
Fig. 4 is the structural representation of the workpiece support to be welded of the utility model.
Fig. 5 is that the workpiece to be welded of the utility model is placed in the cutaway view on the work supporting block to be welded.
Fig. 6 is the upward view part of roller 41, arc welding gun head 42, pinch roller 43 and the cantilever 40 of the utility model.
The specific embodiment
The utility model is further described with specific embodiment below in conjunction with accompanying drawing, referring to Fig. 1-6:
Stitch roll welding/cutting mechanics hand entirely from motion tracking; Base 10 is provided with the slide plate 20 that laterally moves along base; Be provided with between slide plate 20 and the base 10 and promote the holddown spring 15 that slide plate 20 moves to workpiece 56 directions to be welded, the middle part of holddown spring 15 is provided with the axis of guide 14, and slide plate 20 is provided with the slide unit 30 that vertically moves along slide plate 20; Be provided with between slide plate 20 and the slide unit 30 and promote the holddown spring 24 that slide unit 30 vertically moves; The middle part of holddown spring 24 is provided with the axis of guide 23, and slide unit 30 is provided with cantilever 40, and a side of cantilever 40 outer ends is provided with the roller 41 that rolls along the circumferential weld of workpiece 56 to be welded; Described roller 41 is to make with grinding tool steel or wearability is good, rigidity is bigger steel; To increase its service life, arc welding gun head 42 is arranged on the cantilever 40 of roller 41 1 sides (upside or downside), and arc welding gun head 42 or burner head or cutting dress are arranged on the cantilever 40 with the forward and backward side of roller 41 or left and right side; One side of arc welding gun head 42 or cutter sweep is provided with briquetting or the pinch roller 43 of pushing down seam one side or outer weldment, pinch roller 43 and roller 41 synchronous walkings.
Above-mentioned cantilever 40 adjustable in length, described adjustment are through pneumatic adjustment or electronic adjustment or manual adjustment.
Above-mentioned cantilever 40 is bushing type cantilever (attached middle school does not mark), carries out the total length adjustment of cantilever between the internal and external casing through ACTUATOR or motor or latch.
Above-mentioned slide plate 20 laterally moves with respect to base 10: the upper surface of base 10 is provided with slideway or slide 11; The lower surface of slide plate 20 is provided with the slide rail or the slide bar 21 that can on the slideway of base 10 or slide 11, slide; Base 10 is provided with and drives slide plate 20 and retreat cylinder 12 away from workpiece 56 to be welded; After a weld seam of workpiece 56 to be welded is soldered completion; Retreat the accessory that cylinder 12 action drives on slide plate 20, cantilever 40 and the cantilevers 40 and leave weld seam, make can not bump each other when moving seam welder or workpiece 56 to be welded, retreat that available cable wire 13 is connected between cylinder 12 and the slide plate 20; After retreating cylinder 12 and resetting, can be so that slide plate 20 has a horizontal mobile leeway.
Above-mentioned slide unit 30 vertically moves with respect to slide plate 20: the upper surface of slide plate 20 is provided with slideway or slide 22, and the lower surface of slide unit 30 is provided with the slide rail or the slide bar 31 that can on the slideway of slide plate 20 or slide 22, slide, and slide plate 20 is provided with the location-plate 34 that is positioned on slide unit 30 upper surfaces; Location-plate 34 is provided with brake cylinder 32, the brake cylinder piston rod stretch out or indentation can realize the mutual location of slide unit 30 and location-plate 34 and moves, when roller walking during near circumferential weld ending place; The control cylinder action; Make slide plate 20 and slide unit 30 relative positionings, the roller straight line moving, length actuation time of brake cylinder can be confirmed according to the weld interval of circumferential weld ending place; And control by relay; Thereby accomplish full seam welding, when the seam on the workpiece 56 to be welded had axial dipole field, the roller 41 on the cantilever 40 was also followed the tracks of seam and is made axial dipole field; Drive slide unit 30 and move axially, so that the phase coadaptation with respect to slide plate 20.
The wheel pressing shaft of above-mentioned pinch roller 43 is hinged on the pinch roller axle bed, and the pinch roller axle bed is connected on the cantilever.
Above-mentioned pinch roller axle bed is slidingly connected on the cantilever 40 through guide rod, and the guide rod between pinch roller axle bed and the cantilever 40 is provided with spring, and the elastic force of spring is not through the nut that is screwed onto the guide rod top adjustable (concrete structure of this part draws in the drawings).
One side of above-mentioned base 10 is provided with workpiece support to be welded; Described workpiece support to be welded is: two of support base plate 50 is respectively arranged with fixed board 57 and mobile riser 52; The inboard of fixed board 57 and mobile riser 52 all is hinged with work piece holder 55 to be welded; The support base plate 50 in fixed board 57 outsides is provided with the power set of work piece holder to be welded 56 rotations that drive this side, and described power set are motors 56, and motor 56 drives work piece holder 55 to be welded through travelling gear 58 or sprocket wheel and rotates; The support base plate 50 that moves riser 52 outsides is provided with riser 53; Be provided with between riser 53 and the mobile riser 52 to drive between 54, two work piece holders 55 to be welded of cylinder that move riser 52 clampings or unclamp workpiece 56 to be welded and be provided with work supporting block 51 to be welded, the work supporting block 51 general soft materials that adopt to be welded; For example the upper surface of timber or metal bracket adds elastomeric material, in order to avoid the work piece holder 55 to be welded of damaging.
Be respectively arranged with in the process that clamps workpiece 56 to be welded workpiece 56 to be welded on the opposite face of two above-mentioned work piece holders 55 to be welded along its inclined-plane 522 that upwards slides; The axis 561 of the to be welded workpiece 56 of workpiece 56 to be welded after work piece holder to be welded 55 clamps workpiece 56 to be welded is higher than the axis 562 of workpiece 56 to be welded at the workpiece to be welded 56 in 51 last times of work supporting block to be welded; That is: H2＞H1; The top of work supporting block 51 to be welded is provided with groove 511, so that lay workpiece 56 to be welded.
Going to the bottom of above-mentioned mobile riser 52 is provided with roller 521, the frictional force when moving riser 52 to reduce clamping or to unclamp workpiece 56 to be welded.
Certainly; For the power of reducing friction; Bearing 70 all is installed in all rotating shafts, and the rotating shaft 71 of work piece holder 55 to be welded is provided with thrust bearing, and base 10 is provided with wheel and the positioning stud that moves usefulness; Extension elongation through regulating positioning stud can make the wheel on the base 10 unsettled, makes that base 10 is stable.
The use of the utility model:, move behind the drive slide plate for retreating cylinder charge.Tank body to be welded or cylindrical shell are placed on the work supporting block 51 to be welded and move on the workpiece support to be welded, and cylinder 54 actions are clamped in workpiece 56 to be welded on the workpiece support to be welded; Retreat the cylinder exhaust, under the effect of spring 15, roller moved to tank body to be welded or cylindrical shell and contact, according to circumstances; Can vertically prize slide unit, roller 41 is stuck on the seam, press push button; Can accomplish full seam welding,, then must be earlier change arc welding gun head into cutter sweep (for example gas cutting or plasma electric cut etc.) if during the cut ring limit to tank body or cylindrical shell; Need not card seam, can cut circular or oval-shaped tank body or cylindrical shell behind the cutting seam of having good positioning.
The foregoing description is merely the preferred embodiment of the utility model, is not the protection domain that limits the utility model according to this, so: the equivalence that all structures according to the utility model, shape, principle are done changes, and all should be covered by within the protection domain of the utility model.
Claims (10)
1. stitch roll welding/cutting mechanics hand entirely from motion tracking; It is characterized in that: base is provided with the slide plate that laterally moves along base; Be provided with holddown spring between slide plate and the base, slide plate is provided with the slide unit that vertically moves along slide plate, is provided with holddown spring between slide plate and the slide unit; Slide unit is provided with cantilever; One side of cantilever outer end is provided with the roller that rolls along the circumferential weld of workpiece to be welded, and arc welding gun head or burner head or cutter sweep are arranged on the cantilever of forward and backward side or left and right side of roller, and a side of arc welding gun head or burner head or cutter sweep is provided with briquetting or the pinch roller of pushing down seam one side or outer weldment.
2. according to claim 1ly stitch roll welding/cutting mechanics hand entirely from motion tracking, it is characterized in that: described jib-length can be adjusted, and described adjustment is through pneumatic adjustment or electronic adjustment or manual adjustment.
3. according to claim 2ly stitch roll welding/cutting mechanics hand entirely from motion tracking, it is characterized in that: described cantilever is the bushing type cantilever, carries out the total length adjustment of cantilever through ACTUATOR or motor or latch between the internal and external casing.
4. according to claim 1ly stitch roll welding/cutting mechanics hand entirely from motion tracking; It is characterized in that: described slide plate with respect to horizontal the moving of base is: the upper surface of base is provided with slideway or slide; The lower surface of slide plate is provided with the slide rail or the slide bar that can on the slideway of base or slide, slide, and base is provided with and drives the retreat cylinder of slide plate away from workpiece to be welded.
5. according to claim 4ly stitch roll welding/cutting mechanics hand entirely from motion tracking; It is characterized in that: described slide unit vertically moves with respect to slide plate and is: the upper surface of slide plate is provided with slideway or slide; The lower surface of slide unit is provided with the slide rail or the slide bar that can on the slideway of slide plate or slide, slide; Slide plate is provided with the location-plate that is positioned on the slide unit upper surface; Location-plate is provided with brake cylinder, the brake cylinder piston rod stretch out or indentation can realize the mutual location of slide unit and location-plate and moves.
6. according to claim 1ly stitch roll welding/cutting mechanics hand entirely from motion tracking, it is characterized in that: the wheel pressing shaft of said pinch roller is hinged on the pinch roller axle bed, and the pinch roller axle bed is connected on the cantilever.
7. according to claim 6ly stitch roll welding/cutting mechanics hand entirely from motion tracking; It is characterized in that: described pinch roller axle bed is slidingly connected on the cantilever through guide rod; Guide rod between pinch roller axle bed and the cantilever is provided with spring, and flexible elastic force is adjustable through the nut that is screwed onto the guide rod top.
8. each describedly stitches roll welding/cutting mechanics hand from motion tracking entirely according to claim 1-7; It is characterized in that: a side of said base is provided with workpiece support to be welded; Described workpiece support to be welded is: two of support base plate is respectively arranged with fixed board and mobile riser; The inboard of fixed board and mobile riser all is hinged with work piece holder to be welded; The support base plate in the fixed board outside is provided with the power set of the work piece holder rotation to be welded that drives this side; The support base plate that moves the riser outside is provided with riser, is provided with between riser and the mobile riser to drive to move the cylinder that riser clamped or unclamped workpiece to be welded, is provided with work supporting block to be welded between two work piece holders to be welded.
9. according to claim 8ly stitch roll welding/cutting mechanics hand entirely from motion tracking; It is characterized in that: be respectively arranged with in the process that clamps workpiece to be welded workpiece to be welded on the opposite face of described two work piece holders to be welded along its inclined-plane that upwards slides, the axis of the to be welded workpiece of workpiece to be welded after work piece holder to be welded clamps workpiece to be welded is higher than the axis of the to be welded workpiece of workpiece to be welded on work supporting block to be welded the time.
10. according to claim 8ly stitch roll welding/cutting mechanics hand entirely from motion tracking, it is characterized in that: going to the bottom of described mobile riser is provided with roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205616416U CN202388160U (en) | 2011-12-29 | 2011-12-29 | Automatic tracking full-seam rolling welding/cutting mechanical hand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205616416U CN202388160U (en) | 2011-12-29 | 2011-12-29 | Automatic tracking full-seam rolling welding/cutting mechanical hand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202388160U true CN202388160U (en) | 2012-08-22 |
Family
ID=46663112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205616416U Expired - Lifetime CN202388160U (en) | 2011-12-29 | 2011-12-29 | Automatic tracking full-seam rolling welding/cutting mechanical hand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202388160U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513755A (en) * | 2011-12-29 | 2012-06-27 | 柯友义 | Automatic tracking seam welding/cutting manipulator |
| CN104511715A (en) * | 2013-09-30 | 2015-04-15 | 大连同泰汽车部件有限公司 | Horizontal efficient assembly welding machine for protecting pipe and core pipe of mobile muffler |
| CN107283023A (en) * | 2016-04-11 | 2017-10-24 | 上海美焊智能化科技有限公司 | A kind of big wire tray welding equipment of tube sheet |
| CN107283114A (en) * | 2017-07-25 | 2017-10-24 | 成都焊研科技有限责任公司 | A kind of automatic seaming device of cylinder Straight seam welding machine |
| CN110883451A (en) * | 2019-11-26 | 2020-03-17 | 宁波百华数控机械有限公司 | Four-gun intelligent welding equipment for straight pipe flange |
-
2011
- 2011-12-29 CN CN2011205616416U patent/CN202388160U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513755A (en) * | 2011-12-29 | 2012-06-27 | 柯友义 | Automatic tracking seam welding/cutting manipulator |
| CN102513755B (en) * | 2011-12-29 | 2014-09-17 | 柯友义 | Automatic tracking seam welding/cutting manipulator |
| CN104511715A (en) * | 2013-09-30 | 2015-04-15 | 大连同泰汽车部件有限公司 | Horizontal efficient assembly welding machine for protecting pipe and core pipe of mobile muffler |
| CN107283023A (en) * | 2016-04-11 | 2017-10-24 | 上海美焊智能化科技有限公司 | A kind of big wire tray welding equipment of tube sheet |
| CN107283114A (en) * | 2017-07-25 | 2017-10-24 | 成都焊研科技有限责任公司 | A kind of automatic seaming device of cylinder Straight seam welding machine |
| CN110883451A (en) * | 2019-11-26 | 2020-03-17 | 宁波百华数控机械有限公司 | Four-gun intelligent welding equipment for straight pipe flange |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102513755B (en) | Automatic tracking seam welding/cutting manipulator | |
| CN202388160U (en) | Automatic tracking full-seam rolling welding/cutting mechanical hand | |
| CN102019495B (en) | Multifunction high-precision numerical control plasma machining device | |
| CN201735956U (en) | Workbench of laser cutting machine | |
| CN205614189U (en) | Ultrasonic welding machine ware people | |
| CN202539770U (en) | Novel tracking device for linear welding bead | |
| CN201565782U (en) | Butt-joint type aluminum strip splicing machine | |
| CN111660161B (en) | Automatic cabin longitudinal joint polishing device and longitudinal joint polishing method | |
| CN102974962B (en) | Welding test-bed | |
| CN204295108U (en) | A kind of transformer rush-harvesting and rush-planting welder | |
| CN104057222B (en) | Four-axle linked Intelligent tracking bonding machine | |
| KR20130021565A (en) | Automatic welding system | |
| WO2008110635A1 (en) | A spot welding gun | |
| CN103170705B (en) | Base plate automatic welding special plane and welding method | |
| JP2010137267A (en) | Horizontal type automatic welding equipment for workpiece and workpiece welding method using the same | |
| CN105499784A (en) | Ultrasonic welding robot | |
| CN115673490A (en) | TIG automatic welding machine | |
| CN111451603A (en) | Welding tool for longitudinal and circumferential weld joints of barrel | |
| CN212762601U (en) | Automatic polishing device for longitudinal joint of cabin | |
| CN206464828U (en) | A kind of lathe | |
| CN105478968A (en) | Semi-automatic welding equipment for specially-shaped weld joints | |
| CN109909612A (en) | For welding the laser-beam welding machine of the lower cylindrical work of circularity | |
| CN101417362B (en) | Profiling plane welding special device and method | |
| RU93721U1 (en) | FRICTION WELDING MACHINE | |
| CN206425736U (en) | A kind of gas-distributing pipe truss welding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120822 Effective date of abandoning: 20140917 |
|
| RGAV | Abandon patent right to avoid regrant |