CN105689678B - Communication type casting die vacuumizing control device - Google Patents
Communication type casting die vacuumizing control device Download PDFInfo
- Publication number
- CN105689678B CN105689678B CN201610156042.3A CN201610156042A CN105689678B CN 105689678 B CN105689678 B CN 105689678B CN 201610156042 A CN201610156042 A CN 201610156042A CN 105689678 B CN105689678 B CN 105689678B
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- Prior art keywords
- oil cylinder
- vertical core
- bleed
- passage
- oil
- 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.)
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- 238000004891 communication Methods 0.000 title claims abstract description 11
- 238000005266 casting Methods 0.000 title claims abstract description 10
- 238000005086 pumping Methods 0.000 claims description 17
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 66
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 17
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 241000510097 Megalonaias nervosa Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of communication type casting die vacuumizing control devices, and the first bleed-off passage is offered on evacuating plate, and the second bleed-off passage that the front end of the first bleed-off passage is arranged by die top is connected to the type chamber of mold；The front of evacuating plate is provided with the first vertical core, rear portion is provided with the second vertical core, the rear end of evacuating plate is provided with cross-drilled hole, the front port of the cross-drilled hole is connected to the second vertical core, the first oil cylinder and the second oil cylinder is arranged side by side in the lower section of evacuating plate, the piston rod of first oil cylinder is protruded into straight up in the first vertical core, the piston rod of second oil cylinder is protruded into straight up in the second vertical core, and it is connect with spool, the spool can move up and down under the drive of the second cylinder piston rod, and the access between the first bleed-off passage and cross-drilled hole is made to disconnect or be connected.The present invention can guarantee that mold cavity filling overall process vacuumizes, and structure is simple, it is easy, at low cost to implement, and not only high degree of automation, accurate reliability are good, but also fault-free generates, and effectively increases production efficiency.
Description
Technical field
The invention belongs to technical field of mold, specifically, in particular to a kind of communication type casting die vacuumizing control dress
It sets.
Background technique
Currently, the processing of the products such as crankcase, gearbox generallys use vacuum-pumping type compression mod to realize, which is taken out
The opportunity of vacuum is controlled by vacuum valve.Traditional washboard is board-like or industry universal vacuum valve is primarily present deficiency below:
1, pumping sectional area is too small, cannot reach complete pumping within the short time (30-80ms) that molten aluminum fills mold cavity
The purpose of type intracavity gas out, if increasing section product, molten aluminum, which is easily run, causes plugging fault in pump-line.
2, the shut-in time of vacuum valve is difficult to control, and closes and does not achieve the purpose that very much to fill the pumping of type overall process, Bu Nengshi early
The effect now vacuumized；Close will lead to molten aluminum and enter in pump-line too late causes line clogging failure.
3, traditional vacuum valve failure-frequency is high, has seriously affected production efficiency.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide a kind of communication type die casting
Mould vacuumizes control device.
Technical solution of the present invention is as follows: a kind of communication type casting die vacuumizing control device, including vacuum pumping pump and banding pattern
The mold of chamber, it is characterised in that: on the side of the mold install evacuating plate, offer on the evacuating plate and extend from front to back
First bleed-off passage, the type chamber of the second bleed-off passage and mold that the front end of first bleed-off passage is arranged by die top
Connection；
It is provided with the first vertical core in the front of the evacuating plate, the upper port of first vertical core is communicated with the first bleed-off passage,
The bottom surface of the lower port perforation evacuating plate of first vertical core, is provided with the second vertical core at the rear portion of the evacuating plate, the second vertical core it is upper
Port is connected to the rear end of first bleed-off passage, the bottom surface of the lower port perforation evacuating plate of the second vertical core, the evacuating plate
Rear end be provided with cross-drilled hole, the front port of the cross-drilled hole is connected to the second vertical core, the rear end face of the rear port of cross-drilled hole perforation evacuating plate, and
It is connect by pipeline with the vacuum pumping pump；
The first oil cylinder and the second oil cylinder is arranged side by side in the lower section of the evacuating plate, the rod chamber of the first oil cylinder passes through first
Oil duct is connected to the rod chamber of the second oil cylinder, and the rodless cavity of the first oil cylinder is connected by the rodless cavity of the second oil duct and the second oil cylinder
Logical, the piston rod of first oil cylinder is protruded into straight up in the first vertical core, and the piston rod of the second oil cylinder protrudes into the straight up
It in two vertical cores, and is connect with spool, the spool can move up and down under the drive of the second cylinder piston rod, make the first pumping
Access between channel and cross-drilled hole disconnects or conducting.
Using above technical scheme, when molten aluminum fills mold cavity, vacuum pumping pump by cross-drilled hole on evacuating plate,
The second bleed-off passage on second vertical core, the first bleed-off passage and mold vacuumizes the type chamber of mold, when molten aluminum is filled
After full mold cavity, molten aluminum is flowed along the first bleed-off passage of second bleed-off passage on evacuating plate, and it is perpendicular that molten aluminum flows through first
When hole site, downward pressure can be applied to the piston rod of the first oil cylinder, the piston rod of the first oil cylinder of automatic trigger moves downward,
Using the principle of linker, the piston rod of the first oil cylinder pushes the piston rod of the second oil cylinder to move upwards by hydraulic oil, makes valve
Core closes the access between the first bleed-off passage and cross-drilled hole.Since mold cavity has obtained when molten aluminum touches the piston rod of the first oil cylinder
To being fully populated with, to ensure that filling overall process vacuumizes, the problem of traditional vacuum valve is difficult to control the shut-in time is avoided.
First bleed-off passage is the groove for being formed in evacuating plate upper surface, the groove be located at the first vertical core and the second vertical core it
Between part be snakelike or serpentine or " W " shape.Above the first bleed-off passage of structure moulding is simple, production easy to process, and first takes out
Gas channel can deepen, expand pumping area, while can extend the time that molten aluminum flows to the second vertical core from the first vertical core as far as possible, to keep away
Exempt from molten aluminum to enter in the second vertical core, to prevent the generation of failure.
Preferably, the rectangular chamber of front end dilatation of first bleed-off passage, which passes through multiple mutual
The second parallel bleed-off passage is connected to the type chamber of mold.
In order to simplify structure, production easy to process, first vertical core and the second vertical core are each perpendicular to the first bleed-off passage,
The cross-drilled hole is perpendicular to the second vertical core.
Preferably, first oil duct and the second oil duct are the linear structure being parallel to each other, each oil duct is each perpendicular to
The piston rod of first oil cylinder.
In order to keep structure more compact, the cylinder body of first oil cylinder and the cylinder body of the second oil cylinder are that co-walled formula is integrally tied
Structure opens up the first oil duct and the second oil duct on co-walled.
For the ease of assembly, the cylinder body of first oil cylinder and the cylinder body of the second oil cylinder are separate structure, the first oil cylinder
Cylinder body is connect by two oil pipes with the cylinder body of the second oil cylinder, and the inner hole of this two oil pipes is respectively formed as the first oil duct and second
Oil duct.
The beneficial effects of the present invention are:
1, mold cavity has been fully populated with when due to the piston rod of molten aluminum the first oil cylinder of touch, to ensure that filling
Overall process vacuumizes, and avoids the problem of traditional vacuum valve is difficult to control the shut-in time.
2, the bleed-off passage on evacuating plate can be deepened, expand pumping area, while can avoid molten aluminum and entering pump-line, from
And prevent the generation of failure.
3, the touch of the first cylinder piston rod is joined to key of the invention is divided between the shut-in time of the second cylinder piston rod
Number can be adjusted by the distance that molten aluminum between the diameter and two-piston bar of two cylinder piston rods flows, adjust operation side
Just, compression mod can be vacuumized suitable for various, use scope is extensive.
4, structure is simple, implements to be easy, is at low cost, controls the closing of pump-line not by other machinery component or electrical
Component provides power, and not only high degree of automation, accurate reliability are good, but also fault-free generates, and effectively increases production efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the invention.
Fig. 2 is the A-A cross-sectional view of Fig. 1 and the opening schematic diagram of pump-line.
Fig. 3 is the closing schematic diagram of pump-line.
Fig. 4 is top view of the invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
As shown in Figure 2, Figure 3 and Figure 4, mold 4 is to vacuumize compression mod, the 4 self-contained chamber 41 of mold, the shape of type chamber 41
Size is adapted with the product processed.The second bleed-off passage 42 is opened up at the top of mold 4, the second bleed-off passage 42 is preferably
It is formed in the groove of 4 top surface of mold, the second bleed-off passage 42 can be one, or what is be parallel to each other is multiple.Second takes out
One of gas channel 42 is connected to type chamber 41, the end face of the other end perforation mold 4 of the second bleed-off passage 42.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, evacuating plate 1 is installed on the side of mold 4, is offered on the evacuating plate 1 in the past
The first bleed-off passage 11 extended backward, the first bleed-off passage 11 is the groove for being formed in 1 upper surface of evacuating plate, and first is evacuated
Channel 11 and the second bleed-off passage 42 are preferably placed in same level.The rectangular chamber of front end dilatation of first bleed-off passage 11
15, which is connected to by the second bleed-off passage 42 with the type chamber 41 of mold 4.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, it is provided with the first vertical core 12 in the front of evacuating plate 1, first vertical core 12 is vertical
In the first bleed-off passage 11, the upper port of the first vertical core 12 penetrates through the bottom surface of the first bleed-off passage 11, makes the first vertical core 12 and the
One bleed-off passage 11 communicates, the bottom surface of the lower port perforation evacuating plate 1 of the first vertical core 12.Second is provided at the rear portion of evacuating plate 1
Vertical core 13, the second vertical core 13 are also perpendicularly to the first bleed-off passage 11, and the upper port of the second vertical core 13 penetrates through the first bleed-off passage 11
Bottom surface, be connected to the second vertical core 13 and the rear end of the first bleed-off passage 11, the lower port of the second vertical core 13 perforation evacuating plate 1
Bottom surface.Part of first bleed-off passage 11 between the first vertical core 12 and the second vertical core 13 be snakelike or serpentine or " W " shape or
Other suitable shape.It is provided with cross-drilled hole 14 in the rear end of evacuating plate 1, which is located at the back lower place of the first bleed-off passage 11,
Cross-drilled hole 14 is perpendicular to the second vertical core 13.The front port of cross-drilled hole 14 is connected to the second vertical core 13, and the rear port of cross-drilled hole 14 penetrates through pumping
The rear end face of plate 1, and connect by pipeline with vacuum pumping pump 3.
As shown in Figure 2, Figure 3 and Figure 4, the first oil cylinder 5 and the second oil cylinder 6, the first oil is arranged side by side in the lower section of evacuating plate 1
The rod chamber of cylinder 5 is connected to by the first oil duct 7 with the rod chamber of the second oil cylinder 6, and the rodless cavity of the first oil cylinder 5 passes through the second oil duct
8 are connected to the rodless cavity of the second oil cylinder 6, and the first oil duct 7 and the second oil duct 8 are the linear structure being parallel to each other, and each oil duct is equal
Perpendicular to the piston rod of the first oil cylinder 5.There are two types of the set-up modes of first oil cylinder 5 and the second oil cylinder 6, first, the first oil cylinder 5
The cylinder body of cylinder body and the second oil cylinder 6 is co-walled formula integral structure, and the first oil duct 7 and the second oil duct 8 are opened up on co-walled；Second,
The cylinder body of the cylinder body of first oil cylinder 5 and the second oil cylinder 6 is separate structure, and the cylinder body of the first oil cylinder 5 passes through two oil pipes and second
The cylinder body of oil cylinder 6 connects, and the inner hole of this two oil pipes is respectively formed as the first oil duct 7 and the second oil duct 8.The work of first oil cylinder 5
Stopper rod is protruded into straight up in the first vertical core 12, and when the piston rod of the first oil cylinder 5 is located at highest point, top surface and the first pumping are logical
The bottom surface in road 11 is concordant.The piston rod of second oil cylinder 6 is protruded into the second vertical core 13 straight up, and is connect with spool 9, spool 9
It can move up and down under the drive of 6 piston rod of the second oil cylinder, disconnect the access between the first bleed-off passage 11 and cross-drilled hole 14
Or conducting.
Working principle of the present invention is as follows:
When molten aluminum fills mold cavity 41, vacuum pumping pump 3 by cross-drilled hole 14 on evacuating plate 1, the second vertical core 13,
The second bleed-off passage 42 on first bleed-off passage 11 and mold 4 vacuumizes the type chamber 41 of mold, when molten aluminum is full of
After mold cavity 41, molten aluminum is flowed along the first bleed-off passage 11 of second bleed-off passage 42 on evacuating plate 1, and molten aluminum flows through the
When one 12 position of vertical core, downward pressure, the piston rod of the first oil cylinder of automatic trigger 5 can be applied to the piston rod of the first oil cylinder 5
Move downward, using the principle of linker, the piston rod of the first oil cylinder 5 by hydraulic oil push the piston rod of the second oil cylinder 6 to
Upper movement makes spool 9 move to highest point, closes the access between the first bleed-off passage 11 and cross-drilled hole 14.It needs to reopen
When access between the first bleed-off passage 11 and cross-drilled hole 14, it need to only be equipped with a return mechanism and depress spool 9 and reset.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (5)
1. a kind of communication type casting die vacuumizing control device, the mold (4) including vacuum pumping pump (3) and belt type cavity (41),
It is characterized in that: evacuating plate (1) being installed on the side of the mold (4), the extended from front to back is offered on the evacuating plate (1)
One bleed-off passage (11), the second bleed-off passage that the front end of first bleed-off passage (11) passes through setting at the top of mold (4)
(42) it is connected to the type chamber (41) of mold (4)；
The first vertical core (12) are provided in the front of the evacuating plate (1), the upper port of first vertical core (12) and the first pumping are logical
Road (11) communicates, and the bottom surface of lower port perforation evacuating plate (1) of the first vertical core (12) is provided at the rear portion of the evacuating plate (1)
Second vertical core (13), the upper port of the second vertical core (13) are connected to the rear end of first bleed-off passage (11), the second vertical core
(13) bottom surface of lower port perforation evacuating plate (1), the rear end of the evacuating plate (1) are provided with cross-drilled hole (14), the cross-drilled hole (14)
Front port is connected to the second vertical core (13), the rear end face of rear port perforation evacuating plate (1) of cross-drilled hole (14), and passes through pipeline and institute
State vacuum pumping pump (3) connection；
The first oil cylinder (5) and the second oil cylinder (6), the rod chamber of the first oil cylinder (5) is arranged side by side in the lower section of the evacuating plate (1)
Be connected to by the first oil duct (7) with the rod chamber of the second oil cylinder (6), the rodless cavity of the first oil cylinder (5) by the second oil duct (8) with
The rodless cavity of second oil cylinder (6) is connected to, and the piston rod of first oil cylinder (5) is protruded into straight up in the first vertical core (12), the
The piston rod of two oil cylinders (6) is protruded into straight up in the second vertical core (13), and is connect with spool (9), and the spool (9) is second
It can move up and down under the drive of oil cylinder (6) piston rod, disconnect the access between the first bleed-off passage (11) and cross-drilled hole (14)
Or conducting；
First bleed-off passage (11) is the groove for being formed in evacuating plate (1) upper surface, which is located at the first vertical core (12) and the
Part between two vertical cores (13) is snakelike or serpentine or " W " shape；
First vertical core (12) and the second vertical core (13) are each perpendicular to the first bleed-off passage (11), the cross-drilled hole (14) perpendicular to
Second vertical core (13).
2. communication type casting die vacuumizing control device as described in claim 1, it is characterised in that: first bleed-off passage
(11) the rectangular chamber of front end dilatation (15), the rectangular chamber (15) pass through multiple the second bleed-off passages (42) being parallel to each other
It is connected to the type chamber (41) of mold (4).
3. communication type casting die vacuumizing control device as described in claim 1 or 2 is any, it is characterised in that: described first
Oil duct (7) and the second oil duct (8) are the linear structure being parallel to each other, and each oil duct is each perpendicular to the piston rod of the first oil cylinder (5).
4. communication type casting die vacuumizing control device as claimed in claim 3, it is characterised in that: first oil cylinder (5)
Cylinder body and the second oil cylinder (6) cylinder body be co-walled formula integral structure, the first oil duct (7) and the second oil duct are opened up on co-walled
(8)。
5. communication type casting die vacuumizing control device as claimed in claim 3, it is characterised in that: first oil cylinder (5)
Cylinder body and the cylinder body of the second oil cylinder (6) be separate structure, the cylinder body of the first oil cylinder (5) passes through two oil pipes and the second oil cylinder
(6) cylinder body connection, the inner hole of this two oil pipes are respectively formed as the first oil duct (7) and the second oil duct (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610156042.3A CN105689678B (en) | 2016-03-18 | 2016-03-18 | Communication type casting die vacuumizing control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610156042.3A CN105689678B (en) | 2016-03-18 | 2016-03-18 | Communication type casting die vacuumizing control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105689678A CN105689678A (en) | 2016-06-22 |
| CN105689678B true CN105689678B (en) | 2018-12-11 |
Family
ID=56231339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610156042.3A Active CN105689678B (en) | 2016-03-18 | 2016-03-18 | Communication type casting die vacuumizing control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105689678B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108624B (en) * | 2020-08-25 | 2021-11-26 | 广东鸿图科技股份有限公司 | Vacuum casting system and using method |
| CN113290224A (en) * | 2021-05-26 | 2021-08-24 | 巢湖宜安云海科技有限公司 | Die mould double oil cylinder UNICOM formula evacuating device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9704564L (en) * | 1997-12-08 | 1999-06-09 | Ulf Liljeqvist | Block with metal channels for vacuum clock |
| DE20016166U1 (en) * | 2000-09-01 | 2000-12-28 | Gauermann Joerg | Vacuum device for die casting systems |
| US6513569B1 (en) * | 2001-11-02 | 2003-02-04 | Chun Hsien Li | Vacuum valve for die casting machine |
| CN103410799A (en) * | 2013-07-26 | 2013-11-27 | 北汽福田汽车股份有限公司 | Pumping hydraulic system |
| CN204003697U (en) * | 2014-07-23 | 2014-12-10 | 中联重科股份有限公司 | Hydraulic system of pump and pumping equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152362A (en) * | 1981-03-13 | 1982-09-20 | Nissan Motor Co Ltd | Valve device for gas venting passage in die casting machine |
| JPH067977B2 (en) * | 1985-12-26 | 1994-02-02 | 愛三工業株式会社 | Mold degassing device |
-
2016
- 2016-03-18 CN CN201610156042.3A patent/CN105689678B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9704564L (en) * | 1997-12-08 | 1999-06-09 | Ulf Liljeqvist | Block with metal channels for vacuum clock |
| DE20016166U1 (en) * | 2000-09-01 | 2000-12-28 | Gauermann Joerg | Vacuum device for die casting systems |
| US6513569B1 (en) * | 2001-11-02 | 2003-02-04 | Chun Hsien Li | Vacuum valve for die casting machine |
| CN103410799A (en) * | 2013-07-26 | 2013-11-27 | 北汽福田汽车股份有限公司 | Pumping hydraulic system |
| CN204003697U (en) * | 2014-07-23 | 2014-12-10 | 中联重科股份有限公司 | Hydraulic system of pump and pumping equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105689678A (en) | 2016-06-22 |
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| PB01 | Publication | ||
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 402761 A, No. 60, long Qing Road, Qinggang street, Bishan District, Chongqing. Patentee after: CHONGQING RUITONG SEIKO TECHNOLOGY CO.,LTD. Address before: No. 60, dragon green road, Qingqian street, Bishan District, Chongqing Patentee before: CHONGQING RUITONG INDUSTRIAL CO.,LTD. |
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| CP03 | Change of name, title or address | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Connected vacuum control device for die-casting molds Granted publication date: 20181211 Pledgee: Shanghai Pudong Development Bank Co.,Ltd. Chongqing Branch Pledgor: CHONGQING RUITONG SEIKO TECHNOLOGY CO.,LTD. Registration number: Y2024500000029 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |