CN201594475U - Driving mechanism for medium-pressure circuit switch, and medium-voltage circuit switch containing thereof - Google Patents
Driving mechanism for medium-pressure circuit switch, and medium-voltage circuit switch containing thereof Download PDFInfo
- Publication number
- CN201594475U CN201594475U CN2009201787555U CN200920178755U CN201594475U CN 201594475 U CN201594475 U CN 201594475U CN 2009201787555 U CN2009201787555 U CN 2009201787555U CN 200920178755 U CN200920178755 U CN 200920178755U CN 201594475 U CN201594475 U CN 201594475U
- Authority
- CN
- China
- Prior art keywords
- driving mechanism
- operating axis
- plate
- disc spring
- spring
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
- H01H3/3042—Power arrangements internal to the switch for operating the driving mechanism using spring motor using a torsion spring
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Breakers (AREA)
Abstract
The utility model discloses a driving mechanism for a medium-pressure circuit switch, and a medium-voltage circuit switch containing thereof. The driving mechanism comprises a base plate and a front plate for limiting a space, and a spring assembly. The space is used for containing an operating shaft and a power shaft. The power shaft can be connected with a movable chain of the medium-pressure switch, the operating shaft has a head, and the head can be connected to an operating handle of the operating shaft. The spring assembly is provided with a disc spring, and the disc spring is provided with a first end connected to the operating shaft and a second end connecting to the power shaft. The disc spring is loaded by the rotation of the operating shaft, and actuates the power shaft when released. The operating shaft is provided with a release device, and the release device acts on the power shaft through the manual rotation of the operating shaft. The spring assembly is provided with a preloaded adjusting device for adjusting the disc spring. As the release device and the adjusting device are provided, the driving mechanism can operate under the condition of increased friction force between contact sheets, and has no need of excessively accurate spring size and pretesting on the spring.
Description
Technical field
The utility model relates to the driving mechanism that is used for Medium voltage switch or circuit breaker, particularly relates to having the switch switch driving mechanism that improves characteristic.For the application's purpose, term " middle pressure " is meant the applied voltage of scope between 1KV and 52KV.
Background technology
In the prior art, Medium voltage switch or circuit breaker particularly switch switch is known, and it generally includes driving mechanism, and described driving mechanism functionally is connected to the kinematic chain of described switch and it is activated to disconnect and the contact of closed described switch.Owing to, use mechanical device to come the kinematic chain of actuation switch usually to carrying out the rate request of cut-off/close operation.In most of the cases, drive unit is based on spring, and described spring was loaded before carrying out the cut-off/close operation; When spring was released, energy that driving mechanism produces spring and Motion Transmission activated the cut-off/close operation with required speed thus to the kinematic chain of switch.
Although current known driving mechanism is fit to the cut-off/close operation of Medium voltage switch or circuit breaker to a certain extent, they are being not to be entirely satisfactory aspect performance and/or the manufacturing cost.
Increase frictional force between the contact blade that causes owing to the abnormal condition of equipment may go wrong in the operating period of Medium voltage switch or circuit breaker.In the case, breaking-off contact (being about to contact blade " separates " each other) energy needed is greater than energy needed under the normal condition.As a result, the oversized dimensions that needs spring usually is to carry out correct operation in all cases, and the result has increased manufacturing cost.
Further problem is derived from the rate request to the cut-off/close operation of switch---and this relates to the accurate dimension design and the accurately test thereof of spring.
In addition, the characteristic of spring may change during working life, the speed characteristics of related switch can be reduced to thus to be lower than the value that can not accept again.
The utility model content
Therefore, a purpose of the present utility model provides a kind of driving mechanism that is used for Medium voltage switch or circuit breaker, especially for the driving mechanism of switch switch, to avoid or to reduce above-mentioned shortcoming at least.
More particularly, a purpose of the present utility model provides a kind of driving mechanism that is used for Medium voltage switch or circuit breaker of moving of also allowing under the situation that the frictional force between the contact blade increases.
As further purpose, the utility model is intended to provide a kind of Medium voltage switch or circuit breaker driving mechanism that does not need the oversized dimensions spring.
The further purpose of the utility model provides a kind of following driving mechanism that is used for Medium voltage switch or circuit breaker: it does not need the too accurate dimensions of spring and test in advance.
Another purpose of the present utility model provides characteristic that allows regulating spring in an easy manner and the Medium voltage switch or circuit breaker driving mechanism that makes it to be adapted to the application scenario.
Another purpose of the present utility model provides a kind of the have manufacturing of reduction, the Medium voltage switch or circuit breaker driving mechanism of installation and maintenance cost.
Thereby the utility model relates to a kind of driving mechanism that is used for Medium voltage switch or circuit breaker, and described driving mechanism is characterised in that it comprises:
Limit the substrate and the header board of an inner space, described inner space holds operating axis and the line shaft that is co-axially mounted on first longitudinal axis, described line shaft can functionally be connected to the kinematic chain of Medium voltage switch or circuit breaker to be used for the cut-off/close operation of described switch, described operating axis has head, and described head can be connected to the operating grip that is used for described axle is carried out manual activation;
The spring assembly that comprises disc spring, described disc spring has first end that functionally is connected to described operating axis and second end that can functionally be connected to described line shaft, and described disc spring loads and activate described line shaft by the rotation of described operating axis when being released.
In according to Medium voltage switch or circuit breaker driving mechanism of the present utility model, described operating axis is provided with releasing device, described releasing device acts on the described line shaft by the manual rotation of described operating axis, and described spring assembly has the adjusting device of the prestrain that is used to adjust described disc spring.
The beneficial effects of the utility model are as follows:
Because the existence of described releasing device also allows to operate under the situation that has the frictional force that increases between the contact blade according to Medium voltage switch or circuit breaker driving mechanism of the present utility model, this will describe hereinafter in more detail.Thereby the spring oversized dimensions relevant with the rate request of switch no longer is necessary.
In addition, the existence of adjusting device allows after being installed in the driving mechanism characteristic of spring precisely to be adjusted, and need not too accurate spring size and to the pretest of spring.
The Medium voltage switch or circuit breaker that comprises aforesaid driving mechanism also is a part of the present utility model.
Description of drawings
To learn other features and advantages of the utility model by reading to the explanation that preferred non-exclusive embodiment did of Medium voltage switch or circuit breaker driving mechanism of the present utility model, described embodiment accompanying drawing shown in, in described accompanying drawing:
Fig. 1 is the stereogram according to one of driving mechanism of the present utility model possible embodiment;
Fig. 2 is the front view according to the inside of driving mechanism of the present utility model, and some critical component is shown;
Fig. 3 is the stereogram according to the embodiment of employed operating axis, line shaft and spring assembly in the driving mechanism of the present utility model;
Fig. 4 is the exploded view of assembly among Fig. 3;
Fig. 5 is the front view of assembly among Fig. 3, is depicted as to be in first service position;
Fig. 6 is the front view of assembly among Fig. 3, is depicted as to be in second service position;
Fig. 7 is the part stereogram according to driving mechanism of the present utility model, is depicted as the operating state that is in Fig. 6;
Fig. 8 is the part stereogram according to driving mechanism of the present utility model, is depicted as to be in the 3rd operating state.
Embodiment
With reference to the accompanying drawings, comprise substrate 10 and the header board 11 that limits an inner space with what label 1 was represented substantially according to the driving mechanism that is used for Medium voltage switch or circuit breaker of the present utility model on the whole.Between substrate 10 and header board 11, also can also there be additional plate, for example plate 12 and 13.This driving mechanism comprises that also several are used to be connected to the parts of Medium voltage switch or circuit breaker (it can be a general type, will no longer describe in detail).
Be that according to one of feature of driving mechanism 1 of the present utility model operating axis 2 is provided with releasing device 21, releasing device 21 acts on the described line shaft 3 by the manual rotation of described operating axis 2.As hereinafter explanation better, this allows to act on the line shaft 3, and then also act on the contact assembly of switch, thereby outside spring 41 applied forces, apply additional power, the contact blade of switch is separated from each other even under the situation of the frictional force that has increase between the contact blade, also allow thus.
In addition, in according to driving mechanism 1 of the present utility model, spring assembly 4 is typically provided with adjusting device 40, is used to adjust the prestrain of described disc spring 41.In this way, can change the speed characteristics of spring 41 as required, or at least it is precisely adjusted the variation of wearing out and causing that allows accurately to calibrate the speed characteristics of driving mechanism thus and/or compensate other mechanical organ of for example aging or driving mechanism and/or switch owing to spring self.
Referring to Fig. 2-4, according to the preferred embodiment of driving mechanism 1 of the present utility model, operating axis 2 comprises the dish 22 of circular, and dish 22 longitudinal axis perpendicular to operating axis 2 (promptly perpendicular to first longitudinal axis) are installed.First plate 23 is vertically given prominence to from coiling 22 towards the direction of the head 20 of operating axis 2, and can functionally be connected to second end 412 of described disc spring.
Preferably, line shaft 3 comprises the first L shaped rod member 30, and the first L shaped rod member 30 has flat base portion 31, and flat base portion 31 has first end of rotatably installing along described first longitudinal axis 311; The first L shaped rod member 30 also have from second end 312 of described flat base portion 31 perpendicular to described flat base portion 31, be parallel to described first longitudinal axis, can functionally be connected with second end 412 of disc spring 41 towards outstanding second plate, 32, the second plates 32 of direction of the head 20 of operating axis 2.
In this embodiment, first plate 23 and second plate 32 along parallel direction respectively from coil 22 and flat base 31 outstanding.In addition, the distance of described first longitudinal axis of second plate, 32 distances is greater than the distance of first plate 23 apart from described first longitudinal axis, and in other words, the length of flat base 31 is greater than the diameter of dish 22.Preferably, as shown in Figure 3, the length of second plate 32 is greater than the length of first plate 23.
Particularly, spring assembly 4 preferably include second rod member, 42, the second rod members 42 have corresponding to the dish 22 base portions 43 that are co-axially mounted on the operating axis 2.Base portion 43 is provided with the fixture of first end 411 that is used for disc spring 41; For example fixture can be a groove 430---first end 411 of disc spring 41 is fixed in the groove 430.
In addition, second rod member 42 has distal portions 44, and described adjusting device 40 is set on the distal portions 44.Preferably, described adjusting device 40 is positioned to first plate, 23 compounding practices with described operating axis 2.In practice, according to this embodiment, adjusting device 40 allows dish 22 rotations of second rod member 42 (first end 411 of disc spring is fixed thereon) with respect to operating axis 2, changes the prestrain of disc spring 41 thus, and the result also changes its speed characteristics.
As example, described adjusting device 40 can comprise the hole 47 (being preferably screwed hole) on the described distal portions 44 that is arranged on described second rod member 42, and is inserted in the described hole 47 and against the screw device 45 of described first plate 23 of described operating axis 2.Thereby, can be rotated either large or small degree with respect to operating axis 2 by rotation screw device 45, the second rod members 42, thereby be changed prestrain disc spring 41.
In the particularly preferred embodiment of driving mechanism 1 of the present utility model, described releasing device 21 comprises that key is connected the prodger 210 on the described dish 22 of described operating axis 2, described prodger 210 have can with second plate, the 32 interactional edges 211 of described line shaft 3.
For example, prodger 210 can be the part of an annulus, and its key is connected on the dish 22, has from the radially outstanding edge 211 of described dish 22.The length at edge 211 makes: by with respect to line shaft 3 rotary manipulation axles 2, edge 211 can stop second plate 32 of line shaft 3.In other words, by manual rotary manipulation axle 2, the edge 211 of prodger 210 can contact second plate 32 of line shaft 3.
To explain working method in conjunction with Fig. 5-8.
Fig. 5 is illustrated in the position of operating axis 2 and line shaft 3 under the situation of contact closure of related switch.In the case, disc spring 41 is not loaded (except the prestrain that is applied by adjusting device 40).
Opening operation is to load spring 41 and to begin, and described loading is carried out in the following manner: act on the head 20 of operating axis 2, make it to be rotated counterclockwise, up to the position that reaches Fig. 6.In case disc spring 41 is loaded and is in the position of Fig. 6, then disc spring 41 is released and is unexpected release, and energy is passed to line shaft 3 by second end 412 (second end 412 acts on second plate 32 of line shaft 3) of spring 41 thus.If the contact members of switch is free state (being that frictional force is among limiting design value), then line shaft 3 is rotated, thus the contact of cut-off switch.Yet, existing between the contact blade of switch under the situation of the frictional force that increases, the energy of disc spring possibility is not enough so that they are separated from each other and are not enough to allow opening operation.
In the case, the releasing device of the utility model driving mechanism acts on the line shaft 3, and applies additional power thereon, thereby allows contact members separately.In practice, referring to Fig. 7 and 8, under situation shown in Figure 7 (corresponding to situation shown in Figure 6), the edge 211 of prodger 210 contacts with second plate 32, thereby the power that is applied to operating axis 2 can be passed to line shaft 3, and finally is passed to the contact members of switch.
In the case, the rotation of operating axis 2 can not be blocked, but allows its extra stroke (see figure 8).Thereby, under the situation of the frictional force that has increase between the contact blade, the whole power that are applied to operating axis 2 are passed to line shaft 3, and this power is passed to contact system with the driving mechanism associated switch with the power on the line shaft 3 of being applied to by disc spring 41 (second end 412 by spring 41 acts on second plate 32), allows contact blade separately thus.
In this way, can the size of disc spring 41 be set according under normal circumstances carrying out the required minimum force of opening operation.As explained above, exist between the switch contact sheet under the situation of the frictional force that increases, the additional force that is applied to line shaft 3 by releasing device 21 will allow to separate contact blade and carry out opening operation.
In the special preferred embodiment of the utility model driving mechanism 1, can also there be second operating axis 5.Second operating axis 5 is preferably mounted on second longitudinal axis that is parallel to described first longitudinal axis, and can advantageously be used for carrying out and act on as the operation of the ground connection of the switch on the lower shaft: as described in axle separate with first (master) operating axis 2 that is used to disconnect with closed procedure.
From above explanation as can be seen, the driving mechanism 1 that is used for Medium voltage switch or circuit breaker (particularly switch switch) of the present utility model has a plurality of advantages with respect to the Medium voltage switch or circuit breaker of the conventional driving mechanism of equipment.
Especially, the existence of releasing device 21 allows the energy requirement of disc spring 41 is minimized, and the result saves cost.The more important thing is that the existence of described releasing device 21 allows to separate them under the situation that has excessive friction between the contact blade, the result has increased and the fail safe of driving mechanism associated switch and the fail safe of using the equipment of described switch widely.
In addition, the existence of adjusting device 40 does not need the size of disc spring 41 is provided with too accurately, need not disc spring 41 is carried out pretest yet, and its reason is to calibrate and precisely adjusts the speed characteristics of spring after assembling.Adjusting device 40 allows the speed characteristics of adjusting disc spring 41 under the situation of the characteristic time to time change of spring itself and/or associated mechanical element in addition.
It should be noted that above-mentioned functional device (being releasing device and adjusting device) can be in relative simple mode, with the quite simple parts realization of negligible amounts, structure.Thereby driving mechanism of the present utility model also is efficiently aspect economy.
On the whole, the structure of the utility model driving mechanism is quite compact, can be adapted to considerably less change press the application scenario in the multiple difference.
The driving mechanism that is used for Medium voltage switch or circuit breaker of the present utility model can also be further be included in this in the mode of routine does not have the element and the functional device that describe in detail.
So the Medium voltage switch or circuit breaker driving mechanism of design can have multiple change and obtain several remodeling, and these are all within the scope of the utility model notion.In addition, described in the text all parts, parts and part can be substituted by other technical suitable parts.In practice, the component materials of equipment and size can be provided with arbitrarily according to the needs of technology and state.
Claims (11)
1. a driving mechanism that is used for switch switch is characterized in that, the driving mechanism of this switch switch (1) comprising:
Limit the substrate (10) and the header board (11) of an inner space, described inner space holds operating axis (2) and the line shaft (3) that is co-axially mounted on first longitudinal axis, described line shaft (3) can functionally be connected to disconnection or the closed procedure of kinematic chain to be used for described Medium voltage switch or circuit breaker of Medium voltage switch or circuit breaker, described operating axis (2) has head (20), and described head (20) can be connected to the operating grip that is used for described operating axis is carried out manual activation;
The spring assembly (4) that comprises disc spring (41), described disc spring (41) has first end (411) that functionally is connected to described operating axis (2) and second end (412) that can functionally be connected to described line shaft (3), and described disc spring (41) is loaded and activates described line shaft (3) by the rotation of described operating axis (2) when being released;
Described operating axis (2) is provided with manual rotation by described operating axis (2) and acts on releasing device (21) on the described line shaft (3);
Described spring assembly (4) is provided with the adjusting device (40) of the prestrain that is used to adjust described disc spring (41).
2. driving mechanism according to claim 1 is characterized in that, described operating axis (2) comprising: circular dish (22), and described dish is installed perpendicular to described first longitudinal axis; And first plate (23), described first plate is vertically outstanding from described dish (22) towards the direction of the described head (20) of described operating axis (2), and described first plate (23) can functionally be connected to described second end (412) of described disc spring.
3. driving mechanism according to claim 2, it is characterized in that, described line shaft (3) comprises L shaped first rod member (30), the described first L shaped rod member has flat base portion (31), described flat base portion has first end of rotatably installing along described first longitudinal axis (311), the described first L shaped rod member also has the direction from second end (312) of described flat base portion (31) towards the described head (20) of described operating axis (2), perpendicular to described flat base portion (31), be parallel to outstanding second plate (32) of described first longitudinal axis, the distance of described first longitudinal axis of described second plate (32) distance is greater than the distance of described first plate (23) apart from described first longitudinal axis, and described second plate (32) can functionally be connected with second end (412) of described disc spring (41).
4. driving mechanism according to claim 3, it is characterized in that, described spring assembly (4) comprises second rod member (42), described second rod member (42) has base portion (43) and the distal portions (44) that is co-axially mounted on the described operating axis (2), described base portion (43) has groove (430), first end (411) of described disc spring (41) is fixed in the described groove, and described adjusting device (40) is positioned on the described distal portions (44) of described second rod member (42).
5. driving mechanism according to claim 4 is characterized in that, described first plate (23) compounding practice of described adjusting device (40) and described operating axis (2).
6. driving mechanism according to claim 5, it is characterized in that, described adjusting device (40) comprises the hole (47) on the described distal portions (44) that is arranged on described second rod member (42), and is inserted in the described hole (47) and against the screw device (45) of described first plate (23) of described operating axis (2).
7. driving mechanism according to claim 4 is characterized in that, described releasing device (21) comprises that key is connected the prodger (210) on the described dish (22) of described operating axis (2).
8. driving mechanism according to claim 7 is characterized in that, described prodger (210) have can with the interactional edge of described second plate (32) (211) of described line shaft (3).
9. driving mechanism according to claim 8 is characterized in that, the edge (211) of described prodger (210) contacts described second plate (32) of described line shaft (3) by the manual rotation of described operating axis (2).
10. according to the described driving mechanism of one of claim 1 to 9, it is characterized in that this driving mechanism comprises second operating axis (5) that is installed on second longitudinal axis that is parallel to described first longitudinal axis.
11. a Medium voltage switch or circuit breaker is characterized in that, it comprises according to each described driving mechanism among the claim 1-10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP091592972 | 2009-05-04 | ||
| EP09159297A EP2249360B1 (en) | 2009-05-04 | 2009-05-04 | Drive mechanism for medium voltage switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201594475U true CN201594475U (en) | 2010-09-29 |
Family
ID=41066056
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201787555U Expired - Lifetime CN201594475U (en) | 2009-05-04 | 2009-10-15 | Driving mechanism for medium-pressure circuit switch, and medium-voltage circuit switch containing thereof |
| CN200910206347.0A Active CN101882511B (en) | 2009-05-04 | 2009-10-15 | Drive mechanism for medium voltage switch and medium voltage switch including the drive mechanism |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910206347.0A Active CN101882511B (en) | 2009-05-04 | 2009-10-15 | Drive mechanism for medium voltage switch and medium voltage switch including the drive mechanism |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2249360B1 (en) |
| CN (2) | CN201594475U (en) |
| ES (1) | ES2389588T3 (en) |
| PL (1) | PL2249360T3 (en) |
| RU (1) | RU2531634C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882511B (en) * | 2009-05-04 | 2014-06-18 | Abb技术股份公司 | Drive mechanism for medium voltage switch and medium voltage switch including the drive mechanism |
| CN110400722A (en) * | 2019-07-02 | 2019-11-01 | 浙江华地电子有限公司 | A kind of blast switch |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2645395B1 (en) | 2012-03-26 | 2014-11-12 | ABB Technology AG | An electric switching device and related electric apparatus |
| EP3965130A1 (en) * | 2020-09-07 | 2022-03-09 | ABB Schweiz AG | A switching system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB696142A (en) * | 1950-11-09 | 1953-08-26 | Gen Electric Co Ltd | Improvements in or relating to torsion spring arrangements in electric circuit breakers |
| US3376422A (en) * | 1964-07-15 | 1968-04-02 | Minnesota Mining & Mfg | Radioactive source comprising a sheet article containing a layer of small discrete radioactive beads |
| ATE225080T1 (en) * | 1994-11-07 | 2002-10-15 | Siemens Ag | ROTARY DRIVE |
| JP2002231111A (en) * | 2001-01-31 | 2002-08-16 | Mitsubishi Electric Corp | Driving force accumulating device of switch operating device |
| EP2249360B1 (en) * | 2009-05-04 | 2012-07-04 | ABB Technology AG | Drive mechanism for medium voltage switch |
-
2009
- 2009-05-04 EP EP09159297A patent/EP2249360B1/en active Active
- 2009-05-04 PL PL09159297T patent/PL2249360T3/en unknown
- 2009-05-04 ES ES09159297T patent/ES2389588T3/en active Active
- 2009-10-15 CN CN2009201787555U patent/CN201594475U/en not_active Expired - Lifetime
- 2009-10-15 CN CN200910206347.0A patent/CN101882511B/en active Active
-
2010
- 2010-04-30 RU RU2010117357/07A patent/RU2531634C2/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882511B (en) * | 2009-05-04 | 2014-06-18 | Abb技术股份公司 | Drive mechanism for medium voltage switch and medium voltage switch including the drive mechanism |
| CN110400722A (en) * | 2019-07-02 | 2019-11-01 | 浙江华地电子有限公司 | A kind of blast switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101882511A (en) | 2010-11-10 |
| PL2249360T3 (en) | 2012-12-31 |
| RU2010117357A (en) | 2011-11-10 |
| ES2389588T3 (en) | 2012-10-29 |
| RU2531634C2 (en) | 2014-10-27 |
| CN101882511B (en) | 2014-06-18 |
| EP2249360B1 (en) | 2012-07-04 |
| EP2249360A1 (en) | 2010-11-10 |
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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: 20100929 Effective date of abandoning: 20091015 |
|
| RGAV | Abandon patent right to avoid regrant |