CN201937168U - Electricity-testing handcart tool - Google Patents
Electricity-testing handcart tool Download PDFInfo
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- CN201937168U CN201937168U CN 201020660024 CN201020660024U CN201937168U CN 201937168 U CN201937168 U CN 201937168U CN 201020660024 CN201020660024 CN 201020660024 CN 201020660024 U CN201020660024 U CN 201020660024U CN 201937168 U CN201937168 U CN 201937168U
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- oil
- electrical verification
- fixed
- hydraulic power
- instrument
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Abstract
The embodiment of the utility model provides an electricity-testing handcart tool which comprises a hydraulic power device, a fixing frame and a pushing device. The hydraulic power device is fixed on the fixing frame; both sides of the front end of the fixing frame are respectively provided with two long holes which stretch along the horizontal direction and are arranged at different heights; the pushing device is arranged in the fixing frame, both sides of the front end of the pushing device are respectively provided with two pushing pins which are arranged in different heights and respectively pass through the two long holes on the same side of the front end of the fixing frame from the inner sides of the fixing frame; the power-output end of the hydraulic power device is fixedly connected with the rear end of the pushing device, so that the power-output end can drive the pushing pins of the pushing device to move forward and backward in the long holes of the fixing frame; and throttling valves are installed in an oil-discharge circuit and a oil-return circuit of the hydraulic power device.
Description
Technical field
The utility model relates to the power engineering field, relates in particular to a kind of electrical verification handcart instrument that is used to open switch cubicle.
Background technology
Along with the continuous development of national economy, power consumption also constantly increases.Newly-built electric substation is many like the mushrooms after rain rises sheer from level ground.And high-tension switch cabinet is to play the key equipment that break-make, control or protection etc. act in electric power system generating, transmission of electricity, distribution, electric energy conversion with in consuming.In order to open high-tension switch cabinet, the high-tension switch cabinet of various brands all is furnished with electrical verification handcart instrument.These electrical verification handcart instruments all are that clean steel is made, and volume is quite huge and very heavy, and weight is usually between 200 kilograms to 500 kilograms.Existing electrical verification handcart instrument in use, need set up guide rail earlier, push away electrical verification handcart instrument, go into guide rail, push position and crank hand layer operation, open in the process of electrical verification door at the electrical verification handcart, vertically be that own wt with electrical verification handcart instrument is a gravity, laterally lean on manpower advancing in the electrical verification handcart instrument king cabinet, by the linkage that opens the door of the work pin of electrical verification handcart instrument extruding switch cubicle, open the door of switch cubicle with this.This process needs at least two people to cooperate together usually and painstakingly just can open the cabinet door jointly.Because electrical verification handcart volume and weight is all very big, therefore adopt the mode of this pure artificial application of force can cause work to waste time and energy, especially problem is even more serious when large-scale multi-compartment electrical verification is operated.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of electrical verification handcart instrument, and it is in light weight, and is easy to use laborsaving.
For achieving the above object, an embodiment of the present utility model provides a kind of electrical verification handcart instrument, comprise hydraulic power unit, fixed mount and thrust unit, described hydraulic power unit is fixed on the fixed mount, the front end both sides of described fixed mount respectively are provided with extend and the highly different slotted hole of two horizontal directions, described thrust unit is located in the fixed mount, thrust unit front end both sides respectively are provided with two highly different distributions, two slotted holes of fixed mount front end the same side are passed in two distributions of the every side of thrust unit front end respectively from the inboard of fixed mount, the clutch end of described hydraulic power unit is fixedlyed connected with the rear end of thrust unit, so that move forward and backward in the slotted hole of distribution in fixed mount of clutch end driving thrust unit;
Described hydraulic power unit comprises: fuel tank, pumping cylinder and hydraulic cylinder, between pumping cylinder and fuel tank, oil suction line is set, in this oil suction line, be provided with oil sucting one-way valve, the oil extraction oil circuit is set between pumping cylinder and hydraulic cylinder, in this oil extraction oil circuit, be provided with the oil extraction unidirectional valve, between hydraulic cylinder and fuel tank, oil return circuit is set, in this oil return loop, is provided with break valve; In described oil extraction oil circuit and oil return circuit, choke valve is set all.
Preferably, the overflow oil circuit is set between oil extraction oil circuit and oil return circuit, in described overflow oil circuit, an overflow valve is set, when being used for oil pressure at the oil extraction oil circuit and overcoming spring pressure in the overflow valve, makes that the oil in the oil extraction oil circuit flows back to the fuel tank from overflow ducts.
Preferably, the rear portion of described fixed mount is the fixed station of fixed hydraulic power device, and the middle part is two stable pipes, and the front portion is the angle steel type metallic plate, and described two metal circular tubes and angle steel type metallic plate are formed the triangle rock-steady structure; Described slotted hole is located at the both sides of angle steel type metallic plate.
Preferably, described thrust unit has three link rods of one one-tenth Vee formation shape, a fixed head that be arranged in parallel along fore-and-aft direction is fixed at the two ends, base angle of the Vee formation shape of forming at described three link rods respectively, the outside of described fixed head be provided with the fixed head vertical direction extend on promote and promote down.
Preferably, the fixed station of described fixed hydraulic power device below and issuing of angle steel type metallic plate are provided with wheel.
Preferably, fixedly connected with at least one location metallic plate in the rear end of the fixed station of described fixed hydraulic power device, and the free end of described location metallic plate and the fixture on the bottom surface offset.
Preferably, described fixture and thrust unit are made by aluminium alloy.
Electrical verification handcart instrument in the utility model is power with the hydraulic power unit, adopted the technology of hydraulic jack, can reach maximum thrust, by pin step on or the hand push hydraulic power unit in pump oil treadle (being handle) originally needing just can realize the several people to push away, shake as possible the power effect that just can reach as possible, the process of unlatching electrical verification door is very laborsaving.And in oil extraction oil circuit in hydraulic power unit and the oil return circuit choke valve is set respectively, the flow value of restriction hydraulic oil, thereby reach the purpose of the flow velocity and the flow of control oil channel hydraulic oil, prevent that in the process of opening the electrical verification door back thrust is to the hydraulic cylinder power that impacts.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the axonometric drawing of the plug system that provides of the utility model embodiment;
Fig. 2 is the end view of the electrical verification handcart instrument among Fig. 1;
Fig. 3 is the vertical view of the electrical verification handcart instrument among Fig. 1;
Fig. 4 is the structural representation of a kind of modified model hydraulic power unit in the electrical verification handcart instrument of the present utility model;
Fig. 5 is the structural representation of the another kind of modified model hydraulic power unit of the electrical verification handcart instrument in the utility model;
Fig. 6 is the concrete structure schematic diagram of the fixed mount in the electrical verification handcart instrument in the utility model;
Fig. 7 is the schematic diagram of the fixed station part among Fig. 6;
Fig. 8 is a structural representation of having installed the fixed station of hydraulic power unit;
Fig. 9 is the thrust unit among Fig. 1 and the part-structure schematic diagram of hydraulic power unit.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the overall schematic that the utility model provides a kind of electrical verification handcart instrument, and Fig. 2 is the end view of the electrical verification handcart instrument among Fig. 1, and Fig. 3 is the vertical view of the electrical verification handcart instrument among Fig. 1.As shown in Figure 1 to Figure 3, this electrical verification handcart instrument comprises hydraulic power unit 1, fixed mount 2 and thrust unit 3.Wherein, hydraulic power unit 1 is fixed on the fixed mount 2, and the front end both sides of fixed mount 2 respectively are provided with two along continuous straight runs and extend and highly different slotted holes 231 and 232.Thrust unit 3 is located in the fixed mount 2, and thrust unit 3 front end both sides respectively are provided with highly different distribution 33 and 34 (followingly the distribution 33 of top can be called distribution, the distribution 34 of below be called down promote).The every side of thrust unit 3 front ends go up to promote 33 and promote 34 two slotted holes 231 and 232 that pass fixed mount 2 front end the same sides respectively from the inboard of fixed mount 2 down.The clutch end of hydraulic power unit 1 is fixedlyed connected with the rear end of thrust unit 3, hydraulic power unit 1 can drive thrust unit 3 by its clutch end and move forward and backward like this, and then makes going up on the thrust unit 3 promote 231 and promote down in 323 the slotted holes 231 and 232 in fixed mount 2 and move forward and backward.
Electrical verification handcart instrument in the utility model is power with the hydraulic power unit, adopted the technology of hydraulic jack, can reach maximum thrust, by pin step on or hand push hydraulic power unit 1 in pump oil treadle originally needing just can realize the several people to push away, shake as possible the power effect that just can reach as possible, in the course of the work, hydraulic power unit 1 provides power for thrust unit 3, finishes the action of opening the door by the distribution on the thrust unit 3, thereby opens high-voltage switch gear electrical verification door cashier's office in a shop.
Below describe the detailed structure of each important component part in the electrical verification handcart instrument in the utility model in detail.
The utility model has also proposed two kinds of follow-on hydraulic power units in order to make traditional hydraulic jack technology can more be applicable to the application scenario of electrical verification handcart instrument, below describes in detail.
Fig. 4 is the structural representation of a kind of modified model hydraulic power unit in the electrical verification handcart instrument of the present utility model.The hydraulic jack technology is utilized hydraulic system to produce boosting power or is promoted weight.Its transmission based on basic principle be exactly pascal's principle, be that liquid pressure everywhere is consistent, like this in the system of balance, the pressure ratio that smaller piston is exerted pressure above is less, and the pressure ratio of exerting pressure on the big piston is bigger, can keep the static of liquid like this, therefore the transmission by liquid can obtain the different pressure that difference is held, thereby realizes the purpose of pressure conversion.
Below introduce the concrete structure of the hydraulic power unit among Fig. 4 in detail, this hydraulic power unit comprises a fuel tank 85, pumping cylinder 82 and hydraulic cylinder 811.Above the piston of pumping cylinder 82, be provided with handle 81.Be provided with oil suction line 86 between fuel tank 85 and pumping cylinder 82, be provided with oil sucting one-way valve 84 in oil suction line 86, this oil sucting one-way valve 84 guarantees that in oil suction line hydraulic oil can only flow to pumping cylinder 81 from fuel tank 85, and can not reverse flow; Be provided with oil extraction oil circuit 89 between pumping cylinder 82 and hydraulic cylinder 811, be provided with oil extraction unidirectional valve 83 in oil extraction oil circuit 89, this oil extraction unidirectional valve 83 guarantees that hydraulic oil can only flow to hydraulic cylinder 811 from pumping cylinder 82 in the oil extraction oil circuit, and can not reverse flow.Step on handle 81 by hand or pin, make the hydraulic oil in the pumping cylinder 82 enter in the hydraulic cylinder 811 through oil extraction unidirectional valve 83, and enter into hydraulic cylinder 811 hydraulic oil since the effect of oil extraction unidirectional valve 83 can not fall back again, force the piston of hydraulic cylinder 811 outside, thereby it is outside to promote weight, in the utility model for thrust unit 2 is pushed away forward.Between hydraulic cylinder 811 and fuel tank 82, be provided with oil return circuit 87, in oil return circuit 87, be provided with break valve 88.In the time the piston of hydraulic cylinder 811 need being drawn back, can open break valve 88, make that the hydraulic oil in the hydraulic cylinder 811 returns to the fuel tank 85 from oil return circuit 87.
In oil extraction oil circuit 89 and oil return circuit 816, a choke valve is set respectively, is designated as 815 and 816 respectively.By adjustable lever in rotary throttle valve 815 and 816 and the gap between the plane, can make hydraulic oil to flow through by this gap, therefore can set a fixing gap width,, thereby reach the purpose of the flow velocity and the flow of control oil channel hydraulic oil with the flow value of restriction hydraulic oil.When handle is worked or when opening break valve and being used for draining, guarantee that by choke valve the flow velocity of hydraulic oil can make the speed of hydraulic cylinder withdrawal become a fixed value, prevent that in the process of opening the electrical verification door back thrust is to the hydraulic cylinder power that impacts.
Fig. 5 is the structural representation of the another kind of modified model hydraulic power unit of the electrical verification handcart instrument in the utility model.On the basis of the hydraulic power unit of the hydraulic power unit among Fig. 5 in Fig. 4, between oil extraction oil circuit 89 and oil return circuit 87, be provided with skimmer circuit 814, an overflow valve 813 is set in skimmer circuit 814.Overflow valve 813 is used for preventing that handle 81 still continues pump oil, may cause the hypertonia of the hydraulic oil of system, system is produced dangerous when resistance (producing to the back thrust that thrust unit produces at the cabinet of the utility model by high-tension switch cabinet) is excessive.Fixing by the selection of overflow valve 813 being set one, the spring of the intensity level in the system safety scope, lead to when intrasystem hydraulic fluid pressure value surpasses the intensity level of spring of overflow valve 813, retaining oil club in the overflow valve 813 is inwardly pressed by hydraulic oil, after oily ball of retaining and sealing surface disengaging, hydraulic oil just can be by the gap between oily ball of retaining and the sealing surface, directly flow back to fuel tank 85 from overflow oil circuit 814, and when the hydraulic fluid pressure of system during less than the intensity of spring, keep off oily ball under the active force of spring again on sealing surface, hydraulic oil just cannot flow back to fuel tank 81 by the gap, therefore overflow valve 813 has played the effect of automatic draining, guaranteed the hydraulic fluid pressure in the system can not surpass safety that overflow valve sets it, also just guaranteed the safety of whole hydraulic system.
In addition, the flow velocitys that are provided with when choke valve 815 and 816 are crossed when low, the flow velocity of system's hydraulic oil is crossed and may be caused the oil pressure of system part too high slowly, for example, when utilizing handle 81 pump oil ratioes very fast, pressure in the oil extraction oil circuit 89 between pumping cylinder 82 and the hydraulic cylinder 811 may be too high, and can avoid the excessive problem of pressure in the oil extraction oil circuit this moment by the automatic draining effect of overflow valve 813.
Fig. 6 is the concrete structure schematic diagram of the fixed mount in the electrical verification handcart instrument in the utility model, and as shown in Figure 6, the rear portion of this fixed mount 2 is the fixed station 21 of fixed hydraulic power device 1, and the middle part is two stable pipes 22, and the front portion is an angle steel type metallic plate 23.All be provided with two slotted holes in the both sides of angle steel type metallic plate, be designated as 231 and 232 respectively.Wherein the height of slotted hole 231 is higher than slotted hole 232.Fig. 7 is the schematic diagram of fixed station 21 parts among Fig. 4, and Fig. 8 is for installing the structural representation of the fixed station 21 of hydraulic power unit 1.
In order to make electrical verification handcart instrument in opening electrical verification door process, can not move backward owing to reaction force, preferably, fixedly connected at least one location metallic plate 4 in the rear end of fixed station 21, the free end of location metallic plate 4 can offset with ground fixture (for example cabinet angle steel of high-tension switch cabinet), draws back to prevent electrical verification handcart instrument.
Fig. 9 shows the thrust unit among Fig. 1 and the part-structure schematic diagram of hydraulic power unit, as shown in Figure 9, this thrust unit 3 have be Vee formation shape three link rods (in Fig. 9, link rod as two hypotenuses of Vee formation shape is labeled as 31, link rod as the base is labeled as 32), these three link rods form stable triangle rock-steady structure, and two link rods 31 at rear portion receive the thrust of hydraulic power unit 1, and anterior link rod 32 can play the effect that the structure of thrust unit 3 is fixed.
A fixed head 35 that be arranged in parallel along fore-and-aft direction is fixed at two ends, the base angle of three link rods (being the angle between link rod 31 and the link rod 32) respectively in the above.The outside of fixed head 35 be provided with fixed head 35 vertical direction extend on promote 33 and promote 34 down.Thrust unit 3 in the utility model adopts two modes of promoting, distribution 34 is used for promoting the linkage of opening the door of electrical verification door wherein, last 33 self-locking devices that are used to push open the linkage of opening the door of electrical verification door of promoting are gone up simultaneously and are promoted 33 and withstand top board, tilt upward to prevent whole electrical verification handcart instrument.
In addition, on above-mentioned electrical verification handcart instrument, can also increase other servicing units, for example, below the fixed station 21 of fixed hydraulic power device 1 and angle steel type metallic plate 23 below be provided with wheel, can further facilitate the position that the user moves whole electrical verification handcart instrument like this, so that it easierly enters the service position or withdraw from the service position.
In order to alleviate the weight of whole electrical verification handcart instrument, fixture and thrust unit can be made by aluminium alloy.Like this can be so that electrical verification handcart instrument is portable light and handy.
The using method of the electrical verification handcart instrument that provides in following simple declaration the utility model.
At first need electrical verification handcart instrument is entered the service position, particularly, mention whole instrument, can only mention the instrument rear end in practice, rely on the wheel of front end to move.To be positioned at the left and right rail of two aligner wheels tradition electrical verification handcarts bottom wheels of two ones, and earlier wheel be put into guide rail, with instrument shift onto promote push up the position of electrical verification Men Kaimen link rod after, more whole instrument set level on ground.
Then, electrical verification handcart instrument is fixed, particularly, the earthing device of the right front bottom of affirmation instrument is fitted with copper earth plate, and the free end of location metallic plate 4 and the cabinet angle steel on ground are offseted, and confirms that break valve 88 is in closed condition.
Confirm afterwards whether ground connection work, the insulation work of whole electrical verification handcart instrument are finished, and whether the switch of switch cubicle closes a floodgate.
Carry out opening door operation, with the mode of foot-operated or hand, the handle of press tool downwards, be pressed onto the bottom after, handle can rebound automatically, generally opening high-tension switch cabinet needs to press continuously handle about 8 times usually, electrical verification this moment door can be opened fully.
Close the electrical verification door, finish electrical verification operation after, at first guarantee safety, turn on break valve 88 then, make hydraulic oil slowly flow back in the fuel tank 85 by oil return circuit 87, hydraulic cylinder 811 slowly withdraw, drive thrust unit 2 is drawn back in the lump, the electrical verification door is slowly closed.
The very light in weight of the electrical verification handcart instrument integral body that the utility model provides, staff's one hand can be mentioned, the fluid,matching pressing system, the staff only need foot-operated like a cork or the hand handle several times, just can easily the electrical verification door of high-tension switch cabinet be opened, the volume of entire tool is also very little, structure is simple relatively, manufacturing cost is also very low, and in oil extraction oil circuit in hydraulic power unit and the oil return circuit choke valve is set respectively, the flow value of restriction hydraulic oil, thus reach the purpose of the flow velocity and the flow of control oil channel hydraulic oil, prevent that in the process of opening the electrical verification door back thrust is to the hydraulic cylinder power that impacts.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (7)
1. electrical verification handcart instrument, it is characterized in that, comprise hydraulic power unit, fixed mount and thrust unit, described hydraulic power unit is fixed on the fixed mount, the front end both sides of described fixed mount respectively are provided with extend and the highly different slotted hole of two horizontal directions, described thrust unit is located in the fixed mount, thrust unit front end both sides respectively are provided with two highly different distributions, two slotted holes of fixed mount front end the same side are passed in two distributions of the every side of thrust unit front end respectively from the inboard of fixed mount, the clutch end of described hydraulic power unit is fixedlyed connected with the rear end of thrust unit, so that move forward and backward in the slotted hole of distribution in fixed mount of clutch end driving thrust unit;
Described hydraulic power unit comprises: fuel tank, pumping cylinder and hydraulic cylinder, between pumping cylinder and fuel tank, oil suction line is set, in this oil suction line, be provided with oil sucting one-way valve, the oil extraction oil circuit is set between pumping cylinder and hydraulic cylinder, in this oil extraction oil circuit, be provided with the oil extraction unidirectional valve, between hydraulic cylinder and fuel tank, oil return circuit is set, in this oil return loop, is provided with break valve; In described oil extraction oil circuit and oil return circuit, choke valve is set all.
2. electrical verification handcart instrument according to claim 1, it is characterized in that, the overflow oil circuit is set between oil extraction oil circuit and oil return circuit, in described overflow oil circuit, an overflow valve is set, when being used for oil pressure at the oil extraction oil circuit and overcoming spring pressure in the overflow valve, make that the oil in the oil extraction oil circuit flows back to the fuel tank from overflow ducts.
3. electrical verification handcart instrument according to claim 1, it is characterized in that the rear portion of described fixed mount is the fixed station of fixed hydraulic power device, the middle part is two stable pipes, the front portion is the angle steel type metallic plate, and described two metal circular tubes and angle steel type metallic plate are formed the triangle rock-steady structure; Described slotted hole is located at the both sides of angle steel type metallic plate.
4. electrical verification handcart instrument according to claim 3, it is characterized in that, described thrust unit has three link rods of one one-tenth Vee formation shape, a fixed head that be arranged in parallel along fore-and-aft direction is fixed at the two ends, base angle of the Vee formation shape of forming at described three link rods respectively, the outside of described fixed head be provided with the fixed head vertical direction extend on promote and promote down.
5. electrical verification handcart instrument according to claim 4 is characterized in that, the fixed station below and the issuing of angle steel type metallic plate of described fixed hydraulic power device are provided with wheel.
6. electrical verification handcart instrument according to claim 4 is characterized in that, fixedlys connected with at least one location metallic plate in the rear end of the fixed station of described fixed hydraulic power device, and the free end of described location metallic plate and the fixture on the bottom surface offset.
7. according to any described electrical verification handcart instrument in the claim 1 to 6, it is characterized in that described fixture and thrust unit are made by aluminium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020660024 CN201937168U (en) | 2010-12-14 | 2010-12-14 | Electricity-testing handcart tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020660024 CN201937168U (en) | 2010-12-14 | 2010-12-14 | Electricity-testing handcart tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937168U true CN201937168U (en) | 2011-08-17 |
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ID=44448677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020660024 Expired - Lifetime CN201937168U (en) | 2010-12-14 | 2010-12-14 | Electricity-testing handcart tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201937168U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097749A (en) * | 2010-12-14 | 2011-06-15 | 宁波电业局 | Electrometric handcart tool |
| CN102097751A (en) * | 2010-12-14 | 2011-06-15 | 宁波电业局 | Hydraulic electricity test handcart tool |
| CN104326415A (en) * | 2014-10-20 | 2015-02-04 | 湖南大麓管道工程有限公司 | Opening device |
-
2010
- 2010-12-14 CN CN 201020660024 patent/CN201937168U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097749A (en) * | 2010-12-14 | 2011-06-15 | 宁波电业局 | Electrometric handcart tool |
| CN102097751A (en) * | 2010-12-14 | 2011-06-15 | 宁波电业局 | Hydraulic electricity test handcart tool |
| CN104326415A (en) * | 2014-10-20 | 2015-02-04 | 湖南大麓管道工程有限公司 | Opening device |
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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: 20110817 Effective date of abandoning: 20130227 |
|
| RGAV | Abandon patent right to avoid regrant |