CN209037848U - Zither parafoil - Google Patents
Zither parafoil Download PDFInfo
- Publication number
- CN209037848U CN209037848U CN201820746052.7U CN201820746052U CN209037848U CN 209037848 U CN209037848 U CN 209037848U CN 201820746052 U CN201820746052 U CN 201820746052U CN 209037848 U CN209037848 U CN 209037848U
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- China
- Prior art keywords
- parafoil
- zither
- traction rope
- fixed
- reel
- 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.)
- Withdrawn - After Issue
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- IBSREHMXUMOFBB-JFUDTMANSA-N 5u8924t11h Chemical compound O1[C@@H](C)[C@H](O)[C@@H](OC)C[C@@H]1O[C@@H]1[C@@H](OC)C[C@H](O[C@@H]2C(=C/C[C@@H]3C[C@@H](C[C@@]4(O3)C=C[C@H](C)[C@@H](C(C)C)O4)OC(=O)[C@@H]3C=C(C)[C@@H](O)[C@H]4OC\C([C@@]34O)=C/C=C/[C@@H]2C)/C)O[C@H]1C.C1=C[C@H](C)[C@@H]([C@@H](C)CC)O[C@]11O[C@H](C\C=C(C)\[C@@H](O[C@@H]2O[C@@H](C)[C@H](O[C@@H]3O[C@@H](C)[C@H](O)[C@@H](OC)C3)[C@@H](OC)C2)[C@@H](C)\C=C\C=C/2[C@]3([C@H](C(=O)O4)C=C(C)[C@@H](O)[C@H]3OC\2)O)C[C@H]4C1 IBSREHMXUMOFBB-JFUDTMANSA-N 0.000 title claims abstract description 122
- 238000004064 recycling Methods 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000006835 compression Effects 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 19
- 230000000694 effects Effects 0.000 claims description 17
- 230000008602 contraction Effects 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 2
- 230000009471 action Effects 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 238000003032 molecular docking Methods 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000010006 flight Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- Toys (AREA)
Abstract
The utility model discloses a kind of zither parafoil, specifically includes: parafoil, kite frame and ejection recyclable device；The lower aerofoil of the parafoil tail portion is provided with more than one empennage；The center of the parafoil lower surface is provided with kite frame；The ejection recyclable device includes: traction rope, energy storage fixed mechanism, reel and power unit A；Described traction rope one end and kite frame are affixed, and the other end is wrapped on reel, and the power unit A realizes the folding and unfolding of traction rope for driving the reel to rotate.By increasing empennage, the zither parafoil of the utility model is set to be provided simultaneously with the excellent stability of round umbrella and the good handling, lift resistance ratio of parafoil, glide ratio, and initial aerodynamic configuration can be kept by the way that kite frame is arranged, convenient for taking off, so that it is had energy storage and fixed function in recycling by setting ejection recyclable device, can be realized and let fly away and recycle automatically.
Description
Technical field
Utility model is related to a kind of zither parafoil.
Background technique
Existing dragging circle umbrella and parafoil have respective advantage and disadvantage.Wherein pull circle umbrella principle it is fairly simple, when canopy with
When air generates relative motion because pulling, generation (is to utilize sky for common parachute perpendicular to the air drag of umbrella cover
Atmidometer slows down), the component of the resistance straight up provides the lift of round umbrella；Pull circle umbrella aerodynamic stbilization with higher
Property and safety, but lift resistance ratio and handling difference.
The reason of same wing of parafoil shape, it generates air force, is identical as general straight wing, according to Bernoulli Jacob's original
Reason, the air velocity of top airfoil is fast, forms low pressure, and lower aerofoil air velocity is slow, forms high pressure, and upper and lower aerofoil forms pressure difference, produces
Raw air force and torque.Parafoil mainly has keel type parafoil and parafoil, and keel type weight is larger and structure is relatively multiple
It is miscellaneous, therefore application is seldom.The parafoil overwhelming majority applied at present is ram air parachute, and this parafoil is the flexibility made of fabric
Component.It is made of upper and lower aerofoil and rib, and rib extends parafoil to many gas chambers are divided into, and has venthole on fin.The wing
The leading edge of umbrella extend to be opening (parafoil having has several closed air chambers at both ends).Ram-air enters gas by opening
Room makes the indoor pressure of gas be greater than the pressure outside gas chamber, and canopy is just filled, and parafoil section is made to reach designed air foil shape.
Venthole on fin can make air flow to another gas chamber from a gas chamber, and the pressure of each gas chamber is made to keep balance.Therefore, the wing
Umbrella is for good lift resistance ratio, glide ratio and handling；But compared to circle umbrella is pulled, the stability of parafoil is poor.
Circle umbrella excellent stability and parafoil good handling, lift resistance ratio, gliding are pulled currently without that can be provided simultaneously with
The parafoil of ratio, and traditional dragging circle umbrella and parafoil can not be realized and be let fly away automatically and recycling function.
Utility model content
In view of this, the present invention provides a kind of zither parafoil, combines the excellent stability of round umbrella and parafoil is good
Handling, lift resistance ratio, glide ratio can keep initial aerodynamic configuration by the way that kite frame is arranged, and be easily installed other function
Energy module, can be realized and let fly away and recycle automatically.
The zither parafoil, comprising: parafoil, the parafoil are parafoil；Further include: kite frame and ejection recycling dress
It sets；The lower aerofoil of the parafoil tail portion is provided with more than one empennage；
The center of the parafoil lower surface is provided with kite frame；
The ejection recyclable device includes: traction rope, energy storage fixed mechanism, reel and power unit A；The traction rope one
End is affixed with kite frame, and the other end is wrapped on reel, and the power unit A realizes traction for driving the reel to rotate
The folding and unfolding of rope；
Energy storage fixed mechanism is provided on the traction rope, the energy storage fixed mechanism includes: energy-storage travelling wave tube and locking
Unlocking mechanism；When recycling zither parafoil by the traction rope, the energy-storage travelling wave tube energy storage, the locking unlocking mechanism will be described
Zither parafoil is locked in end where reel；When the locking unlocking mechanism unlocks the zither parafoil, the energy-storage travelling wave tube releases energy, helps
The zither parafoil is pushed away to rise.
As a kind of preferred embodiment of the utility model, energy-storage travelling wave tube is spring, locking solution in the energy storage fixed mechanism
Latch mechanism includes: recycling fixing seat, quill, fixed loop bar and limited block；The recycling fixing seat is fixed on kite frame
Center, described traction rope one end are affixed by recycling fixing seat and the kite frame；The quill and fixed loop bar
It is arranged at end where the traction rope coiling；The traction rope passes through activity compression sleeve and fixed loop bar；The compression is lived
One end of moving sleeve is sleeved on outside fixed loop bar, and the spring is arranged in the activity compression sleeve inner；The spring
Bottom and the fixing sleeve rod end surface contradict, and top and setting are used for and the recycling fixing seat pair in activity compression sleeve inner
The movable block connect contradicts；When recycling zither parafoil by traction rope, when the recycling fixing seat and the activity compression sleeve inner
Movable block docking after, compress the spring energy-storage, after being displaced downwardly to setting position, pass through the limited block lock movable sleeve
Cylinder.
As a kind of preferred embodiment of the utility model, the power output shaft of the power unit A passes through clutch and institute
State reel to be coaxially connected: when recycling the traction rope, clutch is combined, and the power unit A drives the reel rotation；Release
When the traction rope, clutch separation, zither parafoil rises under the action of aerodynamic force, drives the reel power unit A's
It dallies on power output shaft.
It further include that setting is used to drive the wing in the parafoil lower surface as a kind of preferred embodiment of the utility model
Umbrella opens up the telescopic device of Xiang Shenzhan or contraction along it.
The utility model has the advantages that
(1) by increasing empennage, the zither parafoil of the utility model is made to be provided simultaneously with the excellent stability of round umbrella and the wing
The good handling, lift resistance ratio of umbrella, glide ratio, and initial aerodynamic configuration can be kept by the way that kite frame is arranged, it is convenient for
Fly, so that it is had energy storage and fixed function in recycling by setting ejection recyclable device, can be realized and let fly away and return automatically
It receives.
(2) by setting telescopic device, Automatic-expanding and the contraction of parafoil be can be realized；And the flexible tune of parafoil can be passed through
Whole parafoil area meets the flight lift resistance ratio, glide ratio and flight demand of different weight load, further increases the steady of zither parafoil
Qualitative and adaptive capacity to environment.
Detailed description of the invention
Fig. 1 is the zither parafoil structural schematic diagram of the utility model；
Fig. 2 and Fig. 3 is the structural schematic diagram of parafoil；
Fig. 4 is ejection recyclable device structural schematic diagram；
Fig. 5 is telescopic device structural schematic diagram.
Wherein, 1- parafoil, 2- kite frame, 3- launch recyclable device, 4- canopy, 5- parafoil control wire, 6- load storehouse, 7- tail
The wing, 8- rib, 9- recycling fixing seat, 10- traction rope, 11- activity compression sleeve, the fixed loop bar of 12-, 13- reel, 14- driving
The flexible vertically hung scroll of motor A, 15- telescopic device, 16- motor B, 17- telescopic rod, 18-.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
Embodiment 1:
The present embodiment provides a kind of zither parafoils for having ejection recycling function, and the zither parafoil, which refers to, mutually ties kite with parafoil
Novel parafoil obtained from conjunction.
As shown in Figure 1, the zither parafoil includes: parafoil 1, kite frame 2 and ejection recyclable device 3；
Wherein parafoil 1 combines tradition and pulls good handling, the liter resistance of circle umbrella excellent stability and parafoil
Than, glide ratio.Parafoil 1 is the novel parafoil for increasing empennage on the basis of conventional ram-type parafoil and being formed, such as Fig. 2 and Fig. 3
Shown, parafoil 1 includes: canopy 4, parafoil control wire 5 and load storehouse 6, and wherein canopy 4 includes: top airfoil, lower aerofoil, empennage 7
With rib 8,4 front opening back-end closure of canopy makes its internal cavities form gas chamber, and canopy 4 has certain aerofoil profile after inflating.Gas
Chamber interior be provided with it is multiple along parafoil extend to rib 8, so that plenum interior is divided into multiple sub-air chamber, on rib 8 all
There is venthole, convenient for air circulation between each sub-air chamber.The lower aerofoil of 4 tail portion of canopy is provided with multiple empennages 7, to improve parafoil 1
Stability, empennage 7 be punching type, inner plenum can be connected to the gas chamber of parafoil 1 or each empennage 7 with its own
Inflating port, individually inflate.
Canopy 4 is connected by multiple parafoil control wires 5 with load storehouse 6, is controlled by the executing agency being fixed in load storehouse
Parafoil control wire 5 processed realizes pitching and the yaw motion of parafoil 1.
Kite frame 2 is fixed on the center of 1 lower surface of parafoil, kite frame 2 can be square, rectangle, sector,
The shapes such as the flights such as trapezoidal, triangle and butterfly birds and insect, can also be with the aeration aperture matching design of parafoil 1 at pros
Other stereoscopic appearances such as body, cuboid.Kite frame 2 is filled for making zither parafoil keep initial aerodynamic configuration, and as ejection recycling
Set 3 mounting bracket.
Ejection recyclable device 3 is mainly used for boosting zither parafoil when zither parafoil is let fly away and quickly rises, energy storage and fixation when recycling.
As shown in figure 4, ejection recyclable device 3 includes: recycling fixing seat 9, traction rope 10, activity compression sleeve 11, loop bar 12, reel
13 and driving motor A14.Wherein recycling fixing seat 9 is fixed on the center of kite frame 2, and traction rope 10 (is similar to kite rope)
One end and recycling fixing seat 9 are affixed, and the other end is wrapped on reel 13, and the power output shaft of driving motor A14 passes through clutch
With reel 13 is coaxial is connected, when recycling traction rope 10, remote controlled clutch is combined, and passes through driving motor A14 band movable reel
13 rotations, realize the recycling of traction rope 10；When discharging traction rope 10, remote controlled clutch separation, zither parafoil is in aerodynamic force
Rise under the collective effect of spring-return power, dallies on the power output shaft of driving motor A14 with movable reel 13.
To make zither parafoil have energy storage and fixed function in recycling, it is provided on traction rope 10 close to 13 end of reel
Activity compression sleeve 11 and fixed loop bar 12.Traction rope 10 is passed through from the center of activity compression sleeve 11 and fixed loop bar 12, is pressed
11 one end of contracting quill is sleeved on outside fixed loop bar 12, and activity compression sleeve 11 is internally provided with spring, the bottom of spring
Contradicted with fixed 12 end face of loop bar, top with the work for being used for and recycling fixing seat 9 inside activity compression sleeve 11 and dock is set
Motion block contradicts.Movable block pair when recycling zither parafoil by traction rope 10, inside recycling fixing seat 9 and activity compression sleeve 11
After connecing, activity compression sleeve 11 and spring are moved down, compressed spring, (touch the automatically controlled limit of setting when being displaced downwardly to setting position
Switch) after, the locking to zither parafoil is realized in retaining mechanism pop-up (such as gear tongue)；Clutch separation and driving motor A14 simultaneously
It stops operating；When needing to discharge traction rope 10, remote controlled automatically controlled limit switch, so that retaining mechanism is released to zither parafoil
Locking, at this time spring release can, boosting zither parafoil quickly rises.
Embodiment 2:
On the basis of above-described embodiment 1, it is arranged on parafoil 1 for realizing the Automatic-expanding of parafoil 1 and stretching for contraction
Compression apparatus 15 becomes the zither parafoil for having automatic stretching, extension contraction and ejection recycling function.
As shown in figure 5, telescopic device 15 is arranged on the longitudinally asymmetric line in 1 lower surface of parafoil, comprising: driving motor B16, stretch
Contracting bar 17 and flexible vertically hung scroll 18.Telescopic rod 17 is by the way of stretching and shrinking respectively from both ends, i.e. the interlude of telescopic rod 17
For the fixed section for setting length, it is fixed on kite frame 2；Driving motor B16 is fixed on the fixed section of telescopic rod 17；Fixed section
Both ends are telescopic segment, being capable of synchronous extension or contraction under the control of driving motor B16.The length direction and the wing of telescopic rod 17
Unanimously, uniform intervals are provided with telescopic strap along its length in the telescopic segment at 17 both ends of telescopic rod for the longitudinal direction (open up to) of umbrella 1
18, due to the setting for the vertically hung scroll 18 that stretches, telescopic segment is using by the way of successively flexible paragraph by paragraph, i.e., telescopic segment is by multiple telescopic joint groups
At the vertically hung scroll 18 that stretches is corresponded with telescopic joint, and the end of telescopic joint is arranged in.Each flexible vertically hung scroll 18 respectively with 1 phase of parafoil
Even, so that parafoil 1 be driven to stretch and shrink.
Telescopic rod 17 and flexible vertically hung scroll 18 are contour using carbon fiber, glass reinforced plastic, nylon, ultra-high molecular weight polyethylene or plastics
Strength lightweight nonmetallic materials and aluminium alloy, magnesium alloy, titanium alloy high-strength, lightweight metal material.
In addition, telescopic device 15 can also be using double leval jib stretching motion mode and axis overturning stretching motion mode etc..
Embodiment 3:
On the basis of above-described embodiment 2, the fixed section of telescopic rod 17 is fixed, and there are two driving motors, are respectively used to control
Thus the stretching, extension or contraction of its left and right ends telescopic segment can realize the steering of zither parafoil by the area of the unilateral parafoil of change.
In conclusion the above is only the preferred embodiments of the present utility model only, it is not intended to limit the utility model
Protection scope.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all wrap
Containing being within the protection scope of the utility model.
Claims (9)
1. zither parafoil, comprising: parafoil (1), the parafoil (1) are parafoil (1)；It is characterized by further comprising: kite frame
(2) and recyclable device (3) are launched；The lower aerofoil of parafoil (1) tail portion is provided with more than one empennage (7)；
The center of parafoil (1) lower surface is provided with kite frame (2)；
The ejection recyclable device (3) includes: traction rope (10), energy storage fixed mechanism, reel (13) and power unit A；It is described
Traction rope (10) one end and kite frame (2) are affixed, and the other end is wrapped on reel (13), and the power unit A is for driving institute
Reel (13) rotation is stated, realizes the folding and unfolding of traction rope (10)；
Energy storage fixed mechanism is provided on the traction rope (10), the energy storage fixed mechanism includes: energy-storage travelling wave tube and locking
Unlocking mechanism；When recycling zither parafoil by the traction rope (10), the energy-storage travelling wave tube energy storage, the locking unlocking mechanism will
The zither parafoil is locked in end where reel (13)；When the locking unlocking mechanism unlocks the zither parafoil, the energy storage member
Part releases energy, and zither parafoil described in boosting rises.
2. zither parafoil as described in claim 1, which is characterized in that energy-storage travelling wave tube is spring, lock in the energy storage fixed mechanism
Determining unlocking mechanism includes: recycling fixing seat (9), quill (11), fixed loop bar (12) and limited block；The recycling fixing seat
(9) it is fixed on the center of kite frame (2), described traction rope (10) one end passes through recycling fixing seat (9) and the kite frame
(2) affixed；The quill (11) and fixed loop bar (12) setting are at end where the traction rope (10) coiling (13)；Institute
Traction rope (10) are stated across activity compression sleeve (11) and fixed loop bar (12)；One end of the activity compression sleeve (11) is set with
External in fixed loop bar (12), the spring setting is internal in the activity compression sleeve (11)；The bottom of the spring and institute
State the conflict of fixed loop bar (12) end face, top and setting is used for inside the activity compression sleeve (11) and the recycling fixing seat
(9) movable block docked contradicts；When recycling zither parafoil by traction rope (10), when the recycling fixing seat (9) and the compression
After the internal movable block docking of quill (11), the spring energy-storage is compressed, after being displaced downwardly to setting position, passes through the limit
Position block locking quill (11).
3. zither parafoil as claimed in claim 1 or 2, which is characterized in that the power output shaft of the power unit A passes through clutch
Device with the reel (13) is coaxial is connected: when recycling the traction rope (10), clutch is combined, and the power unit A drives institute
State reel (13) rotation；When discharging the traction rope (10), clutch separation, zither parafoil rises under the action of aerodynamic force, band
The reel (13) is moved to dally on the power output shaft of power unit A.
4. zither parafoil as claimed in claim 1 or 2, which is characterized in that further include that setting is used in the parafoil (1) lower surface
The parafoil (1) is driven to open up the telescopic device (15) of Xiang Shenzhan or contraction along it.
5. zither parafoil as claimed in claim 4, which is characterized in that the telescopic device (15) is arranged in parafoil (1) lower surface,
It include: that can be opened up along the parafoil (1) to flexible telescopic rod (17), for the flexible offer power for the telescopic rod (17)
Power unit B and being arranged be connected on the telescopic rod (17) and with the parafoil (1), for driving the parafoil (1)
Flexible flexible vertically hung scroll (18).
6. zither parafoil as claimed in claim 5, which is characterized in that the telescopic rod (17) is using the side stretched respectively from both ends
Formula, i.e., the described telescopic rod (17) include the telescopic segment of fixed section and fixed section both ends, and the fixed section is fixed on kite frame (2)
On, power unit B is fixed on the fixed section, and the telescopic segment at the fixed section both ends is under the control of the power unit B
Synchronous extension or contraction, stretching, extension or shrinkage direction are opened up with the parafoil (1) 1 to consistent；The telescopic segment uses successively stretches paragraph by paragraph
The mode of contracting, that is, include more than two telescopic joints, and a flexible vertically hung scroll (18), Mei Gesuo is arranged in the end of each telescopic joint
Flexible vertically hung scroll (18) is stated to be connected with the parafoil (1) respectively.
7. zither parafoil as claimed in claim 6, which is characterized in that the fixed section of the telescopic rod (17) is fixed, and there are two power
Unit B is respectively used to control the stretching, extension or contraction of its left and right ends telescopic segment.
8. the zither parafoil as described in claim 5,6 or 7, which is characterized in that the telescopic rod (17) and the flexible vertically hung scroll
(18) carbon fiber, glass reinforced plastic, nylon, ultra-high molecular weight polyethylene, plastics, aluminium alloy, magnesium alloy or titanium alloy are used.
9. zither parafoil as claimed in claim 1 or 2, which is characterized in that the empennage (7) be inflatable, inner plenum with
The gas chamber of the parafoil (1) is connected to or each empennage (7) has independent inflating port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820746052.7U CN209037848U (en) | 2018-05-18 | 2018-05-18 | Zither parafoil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820746052.7U CN209037848U (en) | 2018-05-18 | 2018-05-18 | Zither parafoil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209037848U true CN209037848U (en) | 2019-06-28 |
Family
ID=67028373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820746052.7U Withdrawn - After Issue CN209037848U (en) | 2018-05-18 | 2018-05-18 | Zither parafoil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209037848U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108657428A (en) * | 2018-05-18 | 2018-10-16 | 深圳市百川融创科技有限公司 | Zither parafoil |
-
2018
- 2018-05-18 CN CN201820746052.7U patent/CN209037848U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108657428A (en) * | 2018-05-18 | 2018-10-16 | 深圳市百川融创科技有限公司 | Zither parafoil |
| CN108657428B (en) * | 2018-05-18 | 2024-05-10 | 深圳市百川融创科技有限公司 | Kite parafoil |
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Granted publication date: 20190628 Effective date of abandoning: 20240510 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190628 Effective date of abandoning: 20240510 |
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