CN105436598A - Online automatic pipe cutting device - Google Patents
Online automatic pipe cutting device Download PDFInfo
- Publication number
- CN105436598A CN105436598A CN201511008759.5A CN201511008759A CN105436598A CN 105436598 A CN105436598 A CN 105436598A CN 201511008759 A CN201511008759 A CN 201511008759A CN 105436598 A CN105436598 A CN 105436598A
- Authority
- CN
- China
- Prior art keywords
- hole
- positioning disk
- casing
- automatic
- disk
- 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.)
- Pending
Links
- 238000005520 cutting process Methods 0.000 title abstract description 19
- 238000009434 installation Methods 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 230000033001 locomotion Effects 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D21/00—Machines or devices for shearing or cutting tubes
- B23D21/04—Tube-severing machines with rotating tool-carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D33/00—Accessories for shearing machines or shearing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D33/00—Accessories for shearing machines or shearing devices
- B23D33/02—Arrangements for holding, guiding, and/or feeding work during the operation
- B23D33/04—Arrangements for holding, guiding, and/or feeding work during the operation for making circular cuts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sawing (AREA)
Abstract
The invention provides an online automatic pipe cutting device. The online automatic pipe cutting device comprises a box; a guide disc is arranged in the box; a turntable is arranged on one side of the guide disc; a through hole penetrates through the box, the guide disc and the turntable in sequence, and the through hole is concentric with the turntable; multiple cutters are arranged on the outer side of the through hole, and are uniformly distributed about the axis of the through hole; the cutters include cutter bits and rotating shafts mutually connected; a Lelo polygonal slide way is formed in a guide piece; the rotating shafts are arranged in the slide way after penetrating through the box and the turntable; the cutter bits are positioned on the outer side of the box; deflection pinions are arranged on the rotating shafts; an inner gear ring is arranged on the box, and is concentrically arranged with the through hole; and the pinions and the inner gear ring are matched in an engaged manner. The online automatic pipe cutting device is simple in structure and strong in practicability, adopts an annular cutting method to cut steel pipes to obtain tidy incisions, can be applied to a steel pipe production line, is high in automation degree and excellent in precision, prevents the material waste, needs no secondary processing, reduces the cost, and is high in efficiency.
Description
Technical field
The invention belongs to steel pipe equipment field, especially a kind of automatic on-line pipe installation.
Background technology
In prior art, the cutting method of steel pipe mainly contains emery wheel cutting, sawing machine sawing and roller extruding etc., these methods, there is the problems such as cutting efficiency is low, otch is coarse, cutting noise is large, cut-out low precision in varying degrees, directly affects the efficiency of whole production line.In addition, the otch of steel pipe is tiltedly forbidden, and dimensional discrepancy is larger, and must increase operation and carry out secondary operations, milling length again, sizing, add production cost, causes waste of material
Summary of the invention
In view of this, the present invention is intended to propose a kind of automatic on-line pipe installation, to solve the problem that in prior art, tubing cutting effect is poor, automaticity is low.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of automatic on-line pipe installation, comprise casing, described box house is provided with positioning disk, and described positioning disk side is provided with rotating disk, and through hole runs through described casing, positioning disk and rotating disk successively, with described rotating disk arranged concentric; Several cutters are provided with outside described through hole, several cutters described are uniformly distributed about the axis of described through hole, described cutter comprises interconnective cutter head and rotating shaft, described guide has Lay Lip river polygon slideway, described rotating shaft is arranged in described slideway through described casing and rotating disk, and described cutter head is positioned at outside described casing; Described rotating shaft is provided with the pinion of displacement, and described casing is provided with ring gear, described ring gear and described through hole arranged concentric, described pinion and described ring gear engagement fit.
Further, described slideway is centrally located on the axis of described through hole, and the limit number of described slideway outline is identical with the number of described cutter.
Further, described positioning disk has two, is separately fixed at described box house both sides, and described rotating disk and pinion are between described two positioning disks, and two positioning disks make the motion of cutter more reliable.
Further, described positioning disk comprises interior positioning disk and outer positioning disk, and described outer positioning disk has irregularly-shaped hole, and described interior positioning disk is positioned at described outer positioning disk irregularly-shaped hole, forms described slideway between described interior positioning disk and described outer positioning disk; Described interior positioning disk and described outer positioning disk are all connected with described casing.
Further, the outline of described slideway is Lay Lip river triangle, and described cutter has three.
Further, be provided with protective cover outside described cutter head, described protective cover and described casing are connected.
Further, described protective cover has circular hole, described circular hole and through hole arranged concentric.
Further, be provided with actuator below described rotating disk, described rotating disk is worm gear, and described actuator is worm screw.
Further, be provided with nut below described casing, described nut coordinates with threads of lead screw.
Relative to prior art, a kind of automatic on-line pipe installation of the present invention has following advantage: steel pipe to be cut is through through hole, and ring gear rotates, and drive pinion rotation, cutter rotation, for pipe cutting; Dial rotation simultaneously, carry its tools revolves round the sun, and revolution track is the shape of slideway, and the distance between cutter and through hole first diminishes and becomes large again, completes and once cuts.Structure is simple, practical employing ring cutting method pipe cutting, and otch is neat, may be used for that pipe production line automaticity is high, precision good, avoids waste of material, without the need to secondary operations, saved cost, efficiency is high.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is general illustration of the present invention;
Fig. 2 is positioning disk schematic diagram of the present invention;
Fig. 3 is side view of the present invention;
In figure: 1-casing, 11-through hole, 2 positioning disks, 21-slideway, positioning disk in 22-, the outer positioning disk of 23-, 24-irregularly-shaped hole, 3-cutter, 31-cutter head, 32-rotating shaft, 4-rotating disk, 5-pinion, 6-ring gear, 7-protective cover, 71-circular hole, 8-actuator.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " etc. only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, one or more these features can be expressed or impliedly be comprised to the feature being limited with " first ", " second " etc.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood by concrete condition.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 1, 2, a kind of automatic on-line pipe installation, comprises casing 1, and casing 1 inside is provided with positioning disk 2, and positioning disk 2 side is provided with rotating disk 4, and through hole 11 runs through casing 1, positioning disk 2 and rotating disk 4 successively, with rotating disk 4 arranged concentric; Several cutters 3 are provided with outside through hole 11, several cutters 3 are uniformly distributed about the axis of through hole 11, cutter 3 comprises interconnective cutter head 31 and rotating shaft 32, guide 2 has Lay Lip river polygon slideway 21, rotating shaft 32 is arranged in slideway 21 through casing 1 and rotating disk 4, and cutter head 31 is positioned at outside casing 1; Rotating shaft 3 is provided with the pinion 5 of displacement, and casing 1 is provided with ring gear 6, ring gear 6 and through hole 11 arranged concentric, pinion 5 and ring gear 6 engagement fit.
Slideway 21 is centrally located on the axis of through hole 11, and the limit number of slideway 21 outline is identical with the number of cutter 3.
Positioning disk 2 has two, is separately fixed at the inner both sides of casing 1, and rotating disk 4 and pinion 5 are between two positioning disks 2, and two positioning disks make the motion of cutter more reliable.
Positioning disk 2 comprises interior positioning disk 22 and outer positioning disk 23, and outer positioning disk 23 has irregularly-shaped hole 24, and interior positioning disk 22 is positioned at outer positioning disk 22 irregularly-shaped hole 24, forms slideway 21 between interior positioning disk 22 and outer positioning disk 23; Interior positioning disk 22 is all connected with casing 1 with outer positioning disk 23.
The outline of slideway 21 is Lay Lip river triangle, and cutter 3 has three.
Be provided with protective cover 7 outside cutter head 31, protective cover 1 and casing 1 are connected.
Protective cover 7 has circular hole 71, circular hole 71 and through hole 11 arranged concentric.
In the present embodiment, the outline of curve slideway 21 is Lay Lip river triangle, and cutter 3 has three; Be provided with protective cover 7 outside cutter head 31, protective cover 1 and casing 1 are connected, and have safeguard function, protective cover 7 have circular hole 71, circular hole 71 and through hole 11 arranged concentric.
Be provided with actuator 8 below rotating disk 4, rotating disk 4 is worm gear, and actuator 8 is worm screw, and be provided with nut below casing 1, nut coordinates with threads of lead screw, and leading screw is driven by motor, quick position, is also provided with line slideway auxiliary positioning below casing.
Steel pipe to be cut is through through hole 11, and ring gear 6 rotates, and drive pinion 5 to rotate, cutter 3 rotation, for pipe cutting; Rotating disk 4 rotates simultaneously, drive rotating shaft 32 is revolved round the sun around the axis of through hole 11, revolution track is the shape of slideway 21, when cutter 3 is along slideway 21 from top to arc-shaped side central motion, distance between cutter 3 and through hole 11 diminishes, cutter 3 pipe cutting, and distance during from arc-shaped side center to tip motions between cutter 3 and through hole 11 becomes large, cutter leaves steel pipe, completes and once cuts.Because pinion 5 is profile modified gear, the amount of feeding of cutting thin-wall pipes is little, therefore pinion can not be deviate from ring gear 6, and structure is simple, practical.Upper Period Process carries out, therefore the present invention may be used for the steel pipe on cutting production line, and adopt ring cutting method pipe cutting, otch is neat, and automaticity is high, precision good, avoids waste of material, without the need to secondary operations, saved cost, efficiency is high.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an automatic on-line pipe installation, comprise casing (1), it is characterized in that: described casing (1) inside is provided with positioning disk (2), described positioning disk (2) side is provided with rotating disk (4), through hole (11) runs through described casing (1), positioning disk (2) and rotating disk (4) successively, with described rotating disk (4) arranged concentric; Described through hole (11) outside is provided with several cutters (3), described several cutters (3) are uniformly distributed about the axis of described through hole (11), described cutter (3) comprises interconnective cutter head (31) and rotating shaft (32), described guide (2) has Lay Lip river polygon slideway (21), described rotating shaft (32) is arranged in described slideway (21) through described casing (1) and rotating disk (4), and described cutter head (31) is positioned at described casing (1) outside; Described rotating shaft (3) is provided with the pinion (5) of displacement, described casing (1) is provided with ring gear (6), described ring gear (6) and described through hole (11) arranged concentric, described pinion (5) and described ring gear (6) engagement fit.
2. a kind of automatic on-line pipe installation according to claim 1, it is characterized in that: described slideway (21) is centrally located on the axis of described through hole (11), the limit number of described slideway (21) outline is identical with the number of described cutter (3).
3. a kind of automatic on-line pipe installation according to claim 1, it is characterized in that: described positioning disk (2) has two, be separately fixed at described casing (1) inner both sides, described rotating disk (4) and pinion (5) are positioned between described two positioning disks (2).
4. a kind of automatic on-line pipe installation according to claim 1, it is characterized in that: described positioning disk (2) comprises interior positioning disk (22) and outer positioning disk (23), described outer positioning disk (23) has irregularly-shaped hole (24), described interior positioning disk (22) is positioned at described outer positioning disk (22) irregularly-shaped hole (24), forms described slideway (21) between described interior positioning disk (22) and described outer positioning disk (23); Described interior positioning disk (22) and described outer positioning disk (23) are all connected with described casing (1).
5. a kind of automatic on-line pipe installation according to any one of claim 1-4, is characterized in that: the outline of described slideway (21) is Lay Lip river triangle, and described cutter (3) has three.
6. a kind of automatic on-line pipe installation according to any one of claim 1-4; it is characterized in that: described cutter head (31) outside is provided with protective cover (7), and described protective cover (1) and described casing (1) are connected.
7. a kind of automatic on-line pipe installation according to claim 6, is characterized in that: described protective cover (7) has circular hole (71), described circular hole (71) and through hole (11) arranged concentric.
8. a kind of automatic on-line pipe installation according to any one of claim 1-4, it is characterized in that: described rotating disk (4) below is provided with actuator (8), described rotating disk (4) is worm gear, and described actuator (8) is worm screw.
9. a kind of automatic on-line pipe installation according to any one of claim 1-4, is characterized in that: described casing (1) below is provided with nut, and described nut coordinates with threads of lead screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008759.5A CN105436598A (en) | 2015-12-27 | 2015-12-27 | Online automatic pipe cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008759.5A CN105436598A (en) | 2015-12-27 | 2015-12-27 | Online automatic pipe cutting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105436598A true CN105436598A (en) | 2016-03-30 |
Family
ID=55547479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511008759.5A Pending CN105436598A (en) | 2015-12-27 | 2015-12-27 | Online automatic pipe cutting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105436598A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670937A (en) * | 2017-03-27 | 2017-05-17 | 盐城市港城特种玻璃制品有限公司 | Metal cutting device for door and window manufacturing |
| CN107268989A (en) * | 2017-06-21 | 2017-10-20 | 中国航天建设集团有限公司 | Pipeline wears beam casing pipe construction method of installation |
| CN107470380A (en) * | 2017-07-26 | 2017-12-15 | 浙江宏利汽车零部件有限公司 | Retainer cold extrusion device and cold extrusion method |
| CN108213550A (en) * | 2018-01-31 | 2018-06-29 | 重庆市长寿区维凤商贸有限公司 | A kind of pipe part cutter device |
| CN111570929A (en) * | 2020-06-10 | 2020-08-25 | 安文光 | Superconductor lead screw cut-off equipment |
| CN113695650A (en) * | 2021-10-29 | 2021-11-26 | 成都凌轩精密机械有限公司 | Machining tool and machining method for large-curved-surface long-beam structural part |
| CN114653444A (en) * | 2022-05-27 | 2022-06-24 | 徐州科星科技发展有限公司 | Raw and other materials breaker for feed production of easy clear |
| CN115157345A (en) * | 2022-07-07 | 2022-10-11 | 广东寻夏科技有限公司 | Industrial robot capable of achieving multi-point cutting and working method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848489A (en) * | 1973-03-09 | 1974-11-19 | A Santana | Rotary machine tool |
| JPS61209814A (en) * | 1985-03-13 | 1986-09-18 | Mitsubishi Metal Corp | Tubular member cutting device |
| CN1806982A (en) * | 2006-01-26 | 2006-07-26 | 刘庆国 | Round section tubing slitting mill |
| CN101444855A (en) * | 2008-12-17 | 2009-06-03 | 燕山大学 | Novel circular tube slitting mill |
| CN101912994A (en) * | 2010-07-20 | 2010-12-15 | 周志玉 | Full-automatic pipe cutting machine |
| CN103157847A (en) * | 2011-12-08 | 2013-06-19 | 洛阳锐腾机械技术有限公司 | Tubing chipless cutting device |
| CN205437319U (en) * | 2015-12-27 | 2016-08-10 | 天津尚吉液压设备有限公司 | Automatic pipe cutter |
-
2015
- 2015-12-27 CN CN201511008759.5A patent/CN105436598A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848489A (en) * | 1973-03-09 | 1974-11-19 | A Santana | Rotary machine tool |
| JPS61209814A (en) * | 1985-03-13 | 1986-09-18 | Mitsubishi Metal Corp | Tubular member cutting device |
| CN1806982A (en) * | 2006-01-26 | 2006-07-26 | 刘庆国 | Round section tubing slitting mill |
| CN101444855A (en) * | 2008-12-17 | 2009-06-03 | 燕山大学 | Novel circular tube slitting mill |
| CN101912994A (en) * | 2010-07-20 | 2010-12-15 | 周志玉 | Full-automatic pipe cutting machine |
| CN103157847A (en) * | 2011-12-08 | 2013-06-19 | 洛阳锐腾机械技术有限公司 | Tubing chipless cutting device |
| CN205437319U (en) * | 2015-12-27 | 2016-08-10 | 天津尚吉液压设备有限公司 | Automatic pipe cutter |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106670937A (en) * | 2017-03-27 | 2017-05-17 | 盐城市港城特种玻璃制品有限公司 | Metal cutting device for door and window manufacturing |
| CN107268989A (en) * | 2017-06-21 | 2017-10-20 | 中国航天建设集团有限公司 | Pipeline wears beam casing pipe construction method of installation |
| CN107470380A (en) * | 2017-07-26 | 2017-12-15 | 浙江宏利汽车零部件有限公司 | Retainer cold extrusion device and cold extrusion method |
| CN108213550A (en) * | 2018-01-31 | 2018-06-29 | 重庆市长寿区维凤商贸有限公司 | A kind of pipe part cutter device |
| CN111570929A (en) * | 2020-06-10 | 2020-08-25 | 安文光 | Superconductor lead screw cut-off equipment |
| CN111570929B (en) * | 2020-06-10 | 2021-05-11 | 苏州科知律信息科技有限公司 | Superconductor lead screw cut-off equipment |
| CN113695650A (en) * | 2021-10-29 | 2021-11-26 | 成都凌轩精密机械有限公司 | Machining tool and machining method for large-curved-surface long-beam structural part |
| CN113695650B (en) * | 2021-10-29 | 2022-01-18 | 成都凌轩精密机械有限公司 | Machining tool and machining method for large-curved-surface long-beam structural part |
| CN114653444A (en) * | 2022-05-27 | 2022-06-24 | 徐州科星科技发展有限公司 | Raw and other materials breaker for feed production of easy clear |
| CN115157345A (en) * | 2022-07-07 | 2022-10-11 | 广东寻夏科技有限公司 | Industrial robot capable of achieving multi-point cutting and working method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105436598A (en) | Online automatic pipe cutting device | |
| CN104589389B (en) | Cutting mechanism for corrugated pipe cutting machines | |
| CN101484259B (en) | Device for cutting bar-shaped or tubular workpieces | |
| CN107138807A (en) | A kind of pipe part numerical control device for being used to cut major diameter length length | |
| CN103264169A (en) | Portable in-tank flange end face machining machine | |
| CN103182564A (en) | Turning-milling linkage machining method of large-pitch worm | |
| CN108115155B (en) | A kind of cutting chip breaking device with active power | |
| CN103567530A (en) | Chipless high-speed cutting mechanism | |
| CN205437319U (en) | Automatic pipe cutter | |
| CN207255354U (en) | A kind of new pipe installation | |
| CN103151678B (en) | Wire stripper line sending module | |
| US4023451A (en) | Bottle boring apparatus | |
| CN107216028A (en) | Preform processing unit (plant) | |
| CN108890002B (en) | Numerical control milling machine | |
| CN204036111U (en) | A kind of blade holder turns of multi-functional cylinder bevel cut machine and propulsive mechanism | |
| CN207026967U (en) | A kind of boring and milling grinds complex machining device | |
| CN206898505U (en) | A kind of pipe part numerical control device for being used to cut major diameter length length | |
| CN104960018A (en) | Simple and efficient pipe cutting machine | |
| CN103341773A (en) | Cutter feeding and retracting mechanism used for pipe facing machine | |
| CN104209757A (en) | Full-automatic multifunctional cylinder cutting and beveling machine | |
| CN116160030B (en) | Rotary cutting tool | |
| CN203725558U (en) | Rotating machine head mechanism | |
| CN203292493U (en) | Portable in-tank flange end face processing machine | |
| CN204221132U (en) | A kind of chamfering machine radial feed device | |
| CN102554324B (en) | Cutterhead-deflected linkable internal turbo cutlery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160330 |
|
| WD01 | Invention patent application deemed withdrawn after publication |