CN202398959U - Welding tool for movable combined crane tower section with attachment device and tower section - Google Patents
Welding tool for movable combined crane tower section with attachment device and tower section Download PDFInfo
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- CN202398959U CN202398959U CN 201120453771 CN201120453771U CN202398959U CN 202398959 U CN202398959 U CN 202398959U CN 201120453771 CN201120453771 CN 201120453771 CN 201120453771 U CN201120453771 U CN 201120453771U CN 202398959 U CN202398959 U CN 202398959U
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Abstract
The utility model discloses a welding tool for a movable combined crane tower section with an attachment device and the tower section machined by using the welding tool. The tool comprises a frame base, end plates, upright posts, square flange supports, round flange supports, butting supports, fastening devices and joint clamping dies, wherein the end plates, the upright posts, the square flange supports and round flange supports are arranged on the frame base; the butting supports are arranged at the upper ends of the upright posts; and the fastening device and the joint clamping dies are arranged on the end plates. By the structural characteristics that the attachment sections are connected into a rectangle by four triangular main chord modules in which every two are symmetrically and movably connected, every two of the triangular main chord modules of the attachment sections are symmetrically welded, each combined piece is accurately positioned when assembled on a tool for positioned welding, the welding deformation of a workpiece is reduced, and the integral deformation correction time of the workpiece before and after each combined piece is welded is shortened; and the welding tool for the attachment sections is provided, so that the workpiece interchangeability is easily guaranteed, the labor intensity is lightened, and the labor productivity is improved.
Description
Technical field
The utility model relates to a kind of crane tower joint welding tooling and crane tower joint, relates in particular to box-like crane tower joint welding tooling of a kind of active groups with attachment device and tower joint.
Background technology
The crane body of the tower is to be combined by a plurality of tower joints, and common tower joint is a Welding Structure, can not dismantle, and causes hard transportation.My company in the 2006.4.13 application, Granted publication number discloses the box-like crane tower joint of a kind of active groups with attachment device for " the box-like crane tower joint of the active groups of band attachment device " utility model patent of CN2885809Y; Have the advantage that rational in infrastructure, module is formed, is convenient to transport, solved the problem of crane tower joint hard transportation, inconvenient installation.But the box-like crane tower of the active groups of this band attachment device joint to the requirement of welding procedure than higher; Usually welding deformation is difficult to control; Be prone to cause the weld size error, adhere to after the joint integral solder size and be difficult to realize to exchange etc., particularly align before the weldering, the correction of location and the distortion of postwelding whole workpiece all needs the time of labor; Cause that labour intensity is big, production efficiency is low, a series of problems such as cost height.
Summary of the invention
The technical problem that the utility model will solve is that weld size sum of errors welding deformation is difficult to control, adhere to size after the joint integral solder and is difficult to realize a difficult problem of exchanging when adhering to the whole adaptive welding of joint.
For solving this technical problem, the utility model provides box-like crane tower joint welding tooling of the active groups of band attachment device and tower joint.
For realizing above-mentioned purpose, the utility model has adopted following technical scheme:
The utility model comprises gantry base, end plate, column, square flange bearing, round flange bearing, butt joint bearing, tightening device and joint clamping.
Said gantry base left-right symmetric is provided with equally distributed node on its axis of symmetry.
Said end plate is provided with location facade and lower shoe, and this end plate is fixed on the corner location of gantry base through lower shoe, and the location facade that is positioned at the end plate of homonymy is oppositely arranged.
Said column is provided with upper plate and lower shoe, on this upper plate, is fixed with the butt joint bearing, and this column is fixed on the site position of the line of symmetry of gantry base through lower shoe.
Said butt joint bearing is provided with riser and lower shoe, and said riser is provided with round flange connecting hole and two flange contact facings, and this flange contact facings is parallel to the axis of symmetry of gantry base, and said symmetrical bearing is fixed on the upper plate of column through lower shoe.
Said square flange bearing is provided with upper plate and lower shoe, and said upper plate is provided with square flange connecting hole and square flange contact-making surface, and this square flange bearing is fixed on the left and right side frame and the column position linearly of gantry base through lower shoe.
Said round flange bearing is provided with upper plate and lower shoe; Said upper plate is provided with round flange connecting hole and round flange contact-making surface, and left and right side frame and the column that this round flange bearing is fixed on gantry base through lower shoe be all the other positions of the blue bearing of method to set up linearly and not.
Said tightening device is arranged at the back side of location, the top facade of end plate.
Said joint clamping is arranged on location, the top facade of end plate.
Spacing between the location facade of said two end plates at homonymy is H; Between the homonymy square flange bearing or the centre-to-centre spacing between round flange bearing and the square flange bearing be B; Distance between the round flange centerline hole of said butt joint bearing is B; Both sides main chord center line is A/2 to the distance of the flange contact facings of butt joint bearing; Both sides main chord center line is A/2 to the distance between the round flange contact-making surface of the square flange contact-making surface of both sides square flange bearing, round flange bearing, and the distance between the round flange connecting hole center line of round flange bearing and the location facade of adjacent to end plate is K.
Said gantry base is welded by I-steel and steel plate, and left-right symmetric through cross flat key location, connects into integral body by bolt.
Said end plate is welded by riser and gusset; Be provided with four groups altogether, its lower shoe and gantry base respectively are welded with location side's plate through cross flat key location in the inboard of four groups of risers; This side's of location plate is the location facade, and said end plate is by bolt four jiaos in gantry base.
Said column is welded by channel-section steel and steel plate, is provided with four groups altogether, and its lower shoe and gantry base, upper plate and the base plate that docks bearing are through cross flat key location, and said column lower end is fixed by bolt and gantry base.
Said square flange bearing is welded by steel plate, is provided with six groups altogether, is welded as a whole with gantry base.
Said round flange bearing is welded by steel plate and pipe, is provided with two groups altogether, is welded as a whole with gantry base.
Said butt joint bearing is welded by steel plate, is provided with four groups altogether, and the upper plate of its lower shoe and column is through cross flat key location, by bolt on four columns.
Said tightening device is made up of handwheel, leading screw and nut, is positioned at the end plate upper surface.
Said joint clamping divides two parts up and down, and lower clamp formwork is by the upper surface of bolt tightening in end plate, and upper clamp formwork is flexibly connected by bolt and lower clamp formwork, is provided with four groups altogether.
Use the box-like crane tower joint of active groups of the band attachment device of the utility model institute welding processing; Tower joint height is H with height such as main chord length grade; The distance of center line is A between the main chord; Centre-to-centre spacing in each triangle main chord module between horizontal web member is B, and every horizontal web member end face of flange is A/2 apart from the distance of main chord center line, and distance is K to the horizontal web member center line of tower joint lower surface ground floor apart from main chord lower contact outer face.
Beneficial effect: the utility model is to adhering to joint by the symmetrical in twos design feature that flexibly connects into rectangle of four triangle main chord modules; Symmetrical in twos welding production adheres to joint triangle main chord module; Guaranteed each sub-assembly assembling and positioning when weldering on frock; Each parts is relative position accurately; Prevent and reduced the welding deformation of workpiece, shortened the time that aligns, locate before each sub-assembly weldering and the correction time of postwelding whole workpiece distortion greatly, provide a kind of be easy to guarantee workpiece interchangeability, reduce labor intensity, reduce production costs and raise labour productivity adhere to the joint welding tooling.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the tip plate configurations sketch map of the utility model;
Fig. 3 is the pillar construction sketch map of the utility model;
Fig. 4 is the square flange seat structure sketch map of the utility model;
Fig. 5 is the round flange seat structure sketch map of the utility model;
Fig. 6 is the butt joint seat structure sketch map of the utility model;
Fig. 7 is the connector clamp mode structure sketch map of the utility model;
Fig. 8 is the utility model welding integral effect sketch map;
Fig. 9 is for adhering to joint modular structure sketch map;
Figure 10 is for adhering to joint package assembly sketch map;
Figure 11 is the main chord structural representation;
Figure 12 a is the structural representation when adhering to the Liangping and putting;
Figure 12 b is the structural representation when adhering to the beam vertically-arranged;
Figure 13 is the round flange structural representation.
Among the figure: 1 gantry base, 2 end plates, 3 columns, 4 square flange bearings, 5 round flange bearings, 6 butt joint bearings, 7 tightening devices, 8 joint clampings, M square flange contact-making surface, N round flange contact-making surface, Q flange contact facings, P locate facade.
The specific embodiment
Be described further below in conjunction with the structure of accompanying drawing the utility model.
Shown in Figure 1 is the structural representation of the utility model.
The utility model comprises gantry base 1, end plate 2, column 3, square flange bearing 4, round flange bearing 5, butt joint bearing 6, tightening device 7 and joint clamping 8.
Said gantry base 1 is welded by I-steel and steel plate, divides left-right symmetric two parts, through cross flat key location, connects into integral body by bolt, in the utility model, plays the supporting role to its superstructure.
Shown in Figure 2 is the tip plate configurations sketch map of the utility model.
Said end plate 2 is welded by riser and gusset; Be provided with four groups altogether; Its lower shoe and gantry base 1 respectively are welded with location side's plate through cross flat key location in the inboard of four groups of risers, and this side's of location plate is location facade P; Said end plate 2 plays support and positioning action to main chord by bolt four jiaos in gantry base 1 in the utility model.
Shown in Figure 3 is the pillar construction sketch map of the utility model.
Said column 3 is welded by channel-section steel and steel plate; Be provided with four groups altogether; Its lower shoe and gantry base 1, upper plate and the base plate that docks bearing 6 are through cross flat key location; Said column 3 lower ends are 1 fixing by bolt and gantry base, the upper end is with to dock bearing 6 fixing, in the utility model, play docking the support and the positioning action of bearing 6.
Shown in Figure 4 is the square flange seat structure sketch map of the utility model.
Said square flange bearing 4 is welded by steel plate, is provided with six groups altogether, is welded as a whole with gantry base 1, in the utility model, plays support and positioning action to adhering to beam.
Shown in Figure 5 is the round flange seat structure sketch map of the utility model.
Said round flange bearing 5 is welded by steel plate and pipe, is provided with two groups altogether, is welded as a whole with gantry base 1, in the utility model, plays support and positioning action to adhering in the joint and adhering to the round flange of beam homonymy.
Shown in Figure 6 is the butt joint seat structure sketch map of the utility model.
Said butt joint bearing 6 is welded by steel plate; Be provided with four groups altogether; The upper plate of its lower shoe and column 3 on four columns 3, plays support and the positioning action of not having four groups of round flanges that adhere to the beam side in the joint to adhering to by bolt through cross flat key location in the utility model.
Said tightening device 7 is made up of handwheel, leading screw and nut, is positioned at end plate 2 upper surfaces, in the utility model, plays the effect of location and clamping main chord.
Shown in Figure 7 is the connector clamp mode structure sketch map of the utility model.
Said joint clamping is two parts about in the of 8 minutes, and lower clamp formwork is by the upper surface of bolt tightening in end plate 2, and upper clamp formwork is flexibly connected by bolt and lower clamp formwork, is provided with four groups altogether, in the utility model, play the effect of location and clamping main chord joint.
Below in conjunction with the structure of accompanying drawing this use new type of welding positioning principle is described in detail with the box-like crane tower joint of the active groups of band attachment device.
Shown in Figure 10 for adhering to joint package assembly sketch map.
Adhere to joint and flexibly connect into rectangle by four triangle main chord modules.
Shown in Figure 9 for adhering to joint modular structure sketch map.
Each triangle main chord module is by a main chord (shown in figure 11) and perpendicular, the horizontal web member that is connected each other and corresponding horizontal web member and main chord are connected into leg-of-mutton diagonal web member form; Have horizontal web member to connect into right angled triangle between each horizontal web member, wherein horizontal web member has four layers; On the horizontal web member of a right-angle side position of each triangle main chord module, have one be made into integration with it adhere to beam 9 (shown in Figure 12 a and Figure 12 b); Which is provided with axis hole; The end is provided with square flange; Adhere to the horizontal web member of beam and in a right-angle side plane of each triangle main chord module, be provided with three layers altogether, all the other one decks are round flange (shown in figure 13); Four layers of horizontal web member in another right-angle side plane of each triangle main chord module all are round flange; On two main chords, also have three groups of jacking ear plates; During four triangle main chord module butt joints, press round flange to round flange, square flange is installed the mode of square flange, looks from adhering to the vertical cross section of joint, and round flange and square flange are staggered layout.
Adhere to joint and be made up of four main chord modules, if do not consider the existence of jacking ear plate, said four main chord modules structurally are symmetric arrangement in twos.The utility model adheres to the design feature of joint symmetry combination in twos just to this, accomplish welding production and adhere to the joint segmentation.
Shown in Figure 8 is the utility model welding integral effect sketch map.
The utility model is a body supports by gantry base 1, end plate 2 and column 3; Round flange contact-making surface N and the square flange contact-making surface M of square flange bearing 4, the both sides flange contact facings Q of butt joint bearing 6 and the endoporus arc surface of joint clamping 8 of promptly locating facade P, round flange bearing 5 with the pasting board outer face of end plate 2 are the location; Is clamping tool by tightening device 7 with bolt; Guarantee each parts relative position accurately, save the requirement that the segmentation overall dimensions reaches exchange to be implemented in the adhering to of two groups of symmetrical configuration of welding on the utility model.
Spacing described in the utility model between the location facade P of two end plates 2 of homonymy is H; Between the homonymy square flange bearing 4 or the centre-to-centre spacing between round flange bearing 5 and the square flange bearing 4 be B; Distance between the round flange centerline hole of said butt joint bearing 6 is B; Both sides main chord center line is A/2 to the distance of the flange contact facings Q of butt joint bearing 6; Both sides main chord center line is A/2 to the distance between the round flange contact-making surface N of the square flange contact-making surface M of both sides square flange bearing 4, round flange bearing 5, and the distance between the location facade P of the round flange connecting hole center line of round flange bearing 5 and adjacent to end plate 2 is K.
With four triangle main chord modules of adhering to joint of the utility model institute welding processing by round flange to round flange; After the mode installation and combination of square flange to square flange; The distance of center line is A between the main chord, and the tower joint highly is that main chord length is H, and the centre-to-centre spacing in each triangle main chord module between horizontal web member is B; Every horizontal web member end face of flange is A/2 apart from the distance of main chord center line, and the horizontal web member center line of tower joint lower surface ground floor distance is K apart from main chord lower contact outer face.
Said main chord is before last the utility model; Bonding machine completion of processing by drawing; Promptly the position dimension of three groups of jacking ear plate opposing tabs outer faces and main chord tube center line has been standard size; Distance H and joint body diameter D between main chord joint end face also is standard size simultaneously, and the concentricity of the linearity of main chord and two end connectors also meets drawing requirement; The said beam that adheres to is before last the utility model; Bonding machine completion of processing by drawing; Be that bayonet socket center of arc has been standard size to square flange outer face distance A/2 with bayonet socket arc radius R; Adhere to simultaneously that diaxon hole site size also is standard size on blue bolt hole position size of beam method and the lamina affixad, and the perpendicularity of adhering between beam method orchid and lamina affixad also meets drawing requirement; Each horizontal web member round flange is before last this welding tooling, and machined by drawing finishes, and promptly the position degree of the thickness of flange and each bolt hole has met drawing requirement.
The main chord of bonding machine completion of processing, adhere to beam and round flange by location clamping mode shown in Figure 1; That is: main chord is clamped by joint clamping 8 and tightening device 7 and bolt location; Adhere to beam and clamped by square flange bearing 4 and bolt location, round flange is clamped by round flange bearing 5 and butt joint bearing 6 and bolt location.
After being fixed on the utility model; The web member spare centering that again other intersection scarfings has been processed is welded on each square flange and round flange and the main chord; All weld bonds have been welded at last; Just can realize that the centre-to-centre spacing between horizontal web member is B in each triangle main chord module, every horizontal web member end face of flange is A/2 apart from the distance of main chord center line, and each triangle main chord module height is that main chord length is H; Distance is K to the horizontal web member center line of each triangle main chord module lower surface ground floor apart from main chord lower contact outer face; And the horizontal web member in both sides and end face flange are vertical mutually with respect to main chord in each triangle main chord module, that is: can realize that single triangle main chord module whole size reaches the requirement of exchange, just whole quarter-wave plate of adhering to joint.
Need to prove; On the utility model; With two groups of symmetrical configuration of main chord band jacking ear plate adhere to joint segmentation welding production intact after, again with main chord not with two groups of symmetrical configuration of jacking ear plate to adhere to joint segmentation welding production intact, just accomplished the whole welding production that saves structure that adheres to.
The utility model adopts module to flexibly connect, cross flat key location, and easy disassembly, processing is convenient in the location fast, is beneficial to transportation.
Claims (10)
1. the box-like crane tower of the active groups with attachment device saves welding tooling; It is characterized in that: comprise gantry base (1), end plate (2), column (3), square flange bearing (4), round flange bearing (5), butt joint bearing (6), tightening device (7) and joint clamping (8)
Said gantry base (1) left-right symmetric is provided with equally distributed node on its line of symmetry;
Said end plate (2) is provided with location facade (P) and lower shoe, and this end plate (2) is fixed on the corner location of gantry base (1) through lower shoe, and the location facade (P) that is positioned at the end plate (2) of homonymy is oppositely arranged;
Said column (3) is provided with upper plate and lower shoe, on this upper plate, is fixed with butt joint bearing (6), and this column (3) is fixed on the site position of the line of symmetry of gantry base (1) through lower shoe;
Said butt joint bearing (6) is provided with riser and lower shoe; Said riser is provided with round flange connecting hole and two flange contact facings (Q); This flange contact facings (Q) is parallel to the line of symmetry of gantry base (1), and said butt joint bearing (6) is fixed on the upper plate of column (3) through lower shoe;
Said square flange bearing (4) is provided with upper plate and lower shoe; Said upper plate is provided with square flange connecting hole and square flange contact-making surface (M), and this square flange bearing (4) is fixed on the left and right side frame and column (3) position linearly of gantry base (1) through lower shoe;
Said round flange bearing (5) is provided with upper plate and lower shoe; Said upper plate is provided with round flange connecting hole and round flange contact-making surface (N), and left and right side frame and the column (3) that this round flange bearing (5) is fixed on gantry base (1) through lower shoe be all the other positions of the blue bearing of method to set up (4) linearly and not;
Said tightening device (7) is arranged at the back side of the top location facade (P) of end plate (2);
Said joint clamping (8) is arranged on the top location facade (P) of end plate (2);
Spacing between the location facade (P) of said two end plates (2) that are positioned at homonymy is H; Between the homonymy square flange bearing (4) or the centre-to-centre spacing between round flange bearing (5) and the square flange bearing (4) be B; Distance between the round flange centerline hole of said butt joint bearing (6) is B; Both sides main chord center line is A/2 to the distance of the flange contact facings (Q) of butt joint bearing (6); Both sides main chord center line is A/2 to the distance between the round flange contact-making surface (N) of the square flange contact-making surface (M) of both sides square flange bearings (4), round flange bearing (5), and the distance between the location facade (P) of the round flange connecting hole center line of round flange bearing (5) and adjacent to end plate (2) is K.
2. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling, it is characterized in that: said gantry base (1) is welded by I-steel and steel plate, and left-right symmetric through cross flat key location, connects into integral body by bolt.
3. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling; It is characterized in that: said end plate (2) is welded by riser and gusset; Be provided with four groups altogether, its lower shoe and gantry base (1) respectively are welded with location side's plate through cross flat key location in the inboard of four groups of risers; This side's of location plate is location facade (P), and said end plate (2) is by bolt four jiaos in gantry base (1).
4. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling; It is characterized in that: said column (3) is welded by channel-section steel and steel plate; Be provided with four groups altogether; Its lower shoe and gantry base (1), upper plate and the base plate that docks bearing (6) are through cross flat key location, and said column (3) lower end is fixed by bolt and gantry base (1).
5. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling, it is characterized in that: said square flange bearing (4) is welded by steel plate, is provided with six groups altogether, is welded as a whole with gantry base (1).
6. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling, it is characterized in that: said round flange bearing (5) is welded by steel plate and pipe, is provided with two groups altogether, is welded as a whole with gantry base (1).
7. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling; It is characterized in that: said butt joint bearing (6) is welded by steel plate; Be provided with four groups altogether; The upper plate of its lower shoe and column (3) is through cross flat key location, by bolt on four columns (3).
8. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling, it is characterized in that: said tightening device (7) is made up of handwheel, leading screw and nut, is positioned at end plate (2) upper surface.
9. the box-like crane tower joint of the active groups of band attachment device according to claim 1 welding tooling; It is characterized in that: said joint clamping (8) divides two parts up and down; Lower clamp formwork is by the upper surface of bolt tightening in end plate (2); Upper clamp formwork is flexibly connected by bolt and lower clamp formwork, is provided with four groups altogether.
10. use the box-like crane tower of active groups of each described band attachment device of claim 1 ~ 9 to save the tower joint that welding tooling is processed; Tower joint height is H with height such as main chord length grade; It is characterized in that: the distance of center line is A between the main chord; Centre-to-centre spacing in each triangle main chord module between horizontal web member is B, and every horizontal web member end face of flange is A/2 apart from the distance of main chord center line, and distance is K to the horizontal web member center line of tower joint lower surface ground floor apart from main chord lower contact outer face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120453771 CN202398959U (en) | 2011-11-16 | 2011-11-16 | Welding tool for movable combined crane tower section with attachment device and tower section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120453771 CN202398959U (en) | 2011-11-16 | 2011-11-16 | Welding tool for movable combined crane tower section with attachment device and tower section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202398959U true CN202398959U (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120453771 Withdrawn - After Issue CN202398959U (en) | 2011-11-16 | 2011-11-16 | Welding tool for movable combined crane tower section with attachment device and tower section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202398959U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489913A (en) * | 2011-11-16 | 2012-06-13 | 山东丰汇设备技术有限公司 | Movably combined crane tower section welding fixture with attachment device and product |
| CN104551508A (en) * | 2015-01-13 | 2015-04-29 | 山东丰汇设备技术有限公司 | Welding fixture and method for steel structure board girder of power station boiler |
| CN105817883A (en) * | 2016-06-08 | 2016-08-03 | 中国二十二冶集团有限公司 | Method for rack assembly of hydraulic machine with application of mould |
-
2011
- 2011-11-16 CN CN 201120453771 patent/CN202398959U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489913A (en) * | 2011-11-16 | 2012-06-13 | 山东丰汇设备技术有限公司 | Movably combined crane tower section welding fixture with attachment device and product |
| CN102489913B (en) * | 2011-11-16 | 2014-07-09 | 山东丰汇设备技术有限公司 | Movably combined crane tower section welding fixture with attachment device and product |
| CN104551508A (en) * | 2015-01-13 | 2015-04-29 | 山东丰汇设备技术有限公司 | Welding fixture and method for steel structure board girder of power station boiler |
| CN105817883A (en) * | 2016-06-08 | 2016-08-03 | 中国二十二冶集团有限公司 | Method for rack assembly of hydraulic machine with application of mould |
| CN105817883B (en) * | 2016-06-08 | 2017-09-22 | 中国二十二冶集团有限公司 | Hydraulic press frame group is carried out to method using mold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120829 Effective date of abandoning: 20140709 |
|
| RGAV | Abandon patent right to avoid regrant |