CN205534520U - Tap's change over switch structure - Google Patents
Tap's change over switch structure Download PDFInfo
- Publication number
- CN205534520U CN205534520U CN201620116872.9U CN201620116872U CN205534520U CN 205534520 U CN205534520 U CN 205534520U CN 201620116872 U CN201620116872 U CN 201620116872U CN 205534520 U CN205534520 U CN 205534520U
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- CN
- China
- Prior art keywords
- ratcheting
- switch structure
- faucet
- valve seat
- axostylus axostyle
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Abstract
The utility model relates to a tap's change over switch structure, it contains: a base and all accuse handles, wherein, a base has a water valve seat and two parallel mount in bearing frames in the water valve seat outside, this water valve seat has an appearance room and is used for providing the installation water control valve core, and the eager accuse pole portion of this water control valve core cooperation cover has one by movable fluted disc, should surely control the handle has the axostylus axostyle of twising reverse, and locate on two bearing frames of base through twising reverse the axostylus axostyle pivot, and the front end that should twist reverse the axostylus axostyle inlays the form with rank and is equipped with the nesting part, cooperation group establishes a meshing unit and forms the interlock, the number of teeth of this meshing unit is greater than by movable fluted disc, more with the meshing unit with driven by the movable fluted disc meshing, borrow this to see through gear wheel drive pinion and pull the commentaries on classics mode, eager accuse handle can not only be effectively reduced and the commentaries on classics scope is pulled, can also pull the commentaries on classics with comparatively laborsaving mode, the handle is surely controlled in control, promote convenience and practicality that the structure was used.
Description
Technical field
This utility model relates to a kind of structure for water tap, particularly to the Switch structure of a kind of faucet.
Background technology
Wash one's hands is to utilize friction strength remove dirty and reduce flora on hand, it is to improve Personal hygiene, the generation that keeps off infection and infect the simplest, economic and most efficient method, but the most common structure for water tap, majority is to reach, through left-right rotary control tap handle, the state that current are opened, but handle is directly connected to the water controlling valve core within faucet and forms the gearing mode of to, when causing user by handle rotation process water yield to be strengthened, the rotation swing range of its handle is bigger, cause open and close water the most laborious, do not have practicality.
In view of this, the present inventor is in being engaged in manufacturing development and the design experiences of Related product for many years, for above-mentioned target, in detail after design and scrupulous assessment, eventually this utility model really having a practicality.
Utility model content
For solving above-mentioned technical problem, the purpose of this utility model is: provide the Switch structure of a kind of faucet, it can be through the large gear turn the small gear switching mode, can not only effectively reduce and cut control handle switching scope, control handle, the convenience of lift structure use and practicality can also be cut with more labour-saving mode switching, control.
For achieving the above object, this utility model be the technical scheme is that
A kind of Switch structure of faucet, it comprises:
One pedestal, this pedestal has a water outlet valve seat and two and is parallelly mounted to the bearing block outside water outlet valve seat, this water outlet valve seat has a room for providing installation one water controlling valve core, and this water controlling valve core convexedly stretches in and has all control lever portions outside this room, this is cut control lever portion and is non-cylindrical and cooperation is cased with a passive fluted disc；
All control handle, this is cut control handle and has a torsion axostylus axostyle, and be hubbed at through torsion axostylus axostyle between two bearing blocks of pedestal, the front end of this torsion axostylus axostyle is provided with nesting part with the embedding shape in rank, cooperation group sets a ratcheting unit and forms gearing, this ratcheting unit is fan shape the teeth portion being provided with arc-shaped, this ratcheting unit and the ratcheting drive of passive fluted disc.
The Switch structure of described faucet, what this water outlet valve seat was corresponding a be provided with outlet passage and two water inlet flow channels, this outlet passage and two water inlet flow channels are all communicated to room and are formed and communicate.
The Switch structure of described faucet, this ratcheting unit is provided with the nesting part combination that a combination is worn groove and reversed axostylus axostyle.
The Switch structure of described faucet, the end of this nesting part is provided with an inlay card breach, and this combination is worn groove and is provided with an inlay card fin with the most embedding formation gearing of pulling in inner radius.
The Switch structure of described faucet, this slew range cutting control handle can be adjusted by the teeth portion quantity of ratcheting unit in angle.
The Switch structure of described faucet, also comprising an elastic component, this elastic component is that a scroll spring fits through and is placed on torsion axostylus axostyle, and this elastic component is extended with a fixing end and and reverses end, this fixing end is resisted against base-plates surface, and this torsion end then coordinates and is fixedly arranged on ratcheting unit.
The technical scheme that this utility model also uses is:
A kind of Switch structure of faucet, it comprises:
One pedestal, this pedestal has a water outlet valve seat and and is arranged in the spacing slide rail of water outlet valve seat side, this water outlet valve seat has a room, there is provided and a water controlling valve core is installed, and this water controlling valve core convexedly stretches in and has all control lever portions outside room, this is cut control lever portion and is non-cylindrical and cooperation is cased with a passive fluted disc；
All control handle, this is cut control handle and has a torsion axostylus axostyle and set a ratcheting unit for group and formed and interlock, and this torsional axis boom end is connected a rail bar, and is fitted through by rail bar and be located in limit sliding chutes, this T-shaped shape of ratcheting unit has horizontal teeth portion again, this ratcheting unit and the ratcheting drive of passive fluted disc.
The Switch structure of described faucet, this water outlet valve seat be correspondingly provided with an outlet passage and two water inlet flow channels, this outlet passage and two water inlet flow channels be all communicated to room formed communicate.
The Switch structure of described faucet, this ratcheting unit is provided with a combination and wears groove and reverse axostylus axostyle combination.
The Switch structure of described faucet, this torsion axostylus axostyle is provided with an inlay card breach in end, and this combination is worn groove and is provided with an inlay card fin thus with the most embedding formation gearing of pulling in inner radius.
The Switch structure of described faucet, this slew range cutting control handle can be adjusted by the teeth portion quantity of ratcheting unit in angle.
The technical scheme that this utility model also uses is:
A kind of Switch structure of faucet, it comprises:
One pedestal, this pedestal has a water outlet valve seat and two with the longitudinally asymmetric bearing block being mounted on water outlet valve seat outer wall, this water outlet valve seat has a room, there is provided and a water controlling valve core is installed, and this water controlling valve core convexedly stretches in and has all control lever portions outside room, this is cut control lever portion and is non-cylindrical and cooperation is cased with a passive fluted disc；
All control handle, this cut control handle have a torsion axostylus axostyle for group set one ratcheting unit formed interlock, this ratcheting unit is screw shaped and is longitudinally mounted between two bearing blocks, and this ratcheting unit peripheral ring is provided with spiral helicine teeth portion, this ratcheting unit and the ratcheting drive of passive fluted disc.
The Switch structure of described faucet, this water outlet valve seat be correspondingly provided with an outlet passage and two water inlet flow channels, this outlet passage and two water inlet flow channels be all communicated to room formed communicate.
The Switch structure of described faucet, this ratcheting unit bottom is provided with a combination protuberance and reverses axostylus axostyle combination.
The Switch structure of described faucet, torsional axis boom end be provided with an inlay card breach for combination protuberance embedding pull fixing, and through a latch fitting run through locking formed interlock.
Opening structure is opened in the switching of described faucet, and this slew range cutting control handle is sized in angle adjust by the teeth portion spacing of ratcheting unit.
Compared with prior art, the utility model has the advantage of of technique scheme is used:
Faucet of the present utility model is mainly in cutting between control handle and water controlling valve core through ratcheting unit and the passive ratcheting gearing of valve disc, and the number of teeth of this ratcheting unit, diameter are both greater than passive fluted disc, then to constitute the large gear turn the small gear switching mode, can not only effectively reduce and cut control handle switching scope, really can reach boiled water state by linkage water-control spool simultaneously, then control handle, the convenience of lift structure use and practicality can be cut with more labour-saving mode switching, control.
Accompanying drawing explanation
Fig. 1 is axonometric chart of the present utility model；
Fig. 2 is exploded view of the present utility model；
Fig. 3 is assembled sectional view of the present utility model；
Fig. 4 is that view is cut in the combination at another visual angle of the present utility model；
Fig. 5 is boiled water state stereogram of the present utility model；
Fig. 6 is boiled water state sectional view of the present utility model；
Fig. 7 is the exploded view of another embodiment of the present utility model；
Fig. 8 is the sectional view of another embodiment of the present utility model；
Fig. 9 is the exploded view of the 3rd embodiment of the present utility model；
Figure 10 is the sectional view of the 3rd embodiment of the present utility model.
Description of reference numerals: 10-pedestal；11-water outlet valve seat；111-room；112-outlet passage；113-water inlet flow channel；12-bearing block；13-water controlling valve core；131-cuts control lever portion；The passive fluted disc of 14-；20-cuts control handle；21-reverses axostylus axostyle；210-mandrel；211-nesting part；212-inlay card breach；213-latch fitting；The ratcheting unit of 22-；Groove is worn in 221-combination；222-inlay card fin；223-teeth portion；224-combines protuberance；23-elastic component；The fixing end of 231-；232-reverses end；24-rail bar.
Detailed description of the invention
Further describe this utility model below in conjunction with specific embodiments and the drawings, advantage of the present utility model and feature will be with describe and apparent.
nullFirst，As depicted in figs. 1 and 2，A kind of Switch structure of faucet，It comprises: a pedestal 10 and all control handles 20，Wherein，One pedestal 10 has a water outlet valve seat 11 and two and is parallelly mounted to the bearing block 12 outside water outlet valve seat 11，This water outlet valve seat 11 has a room 111，There is provided and a water controlling valve core 13 is installed，And this water outlet valve seat 11 is correspondingly provided with outlet passage 112 and two water inlet flow channels 113，And be communicated to room 111 formed communicate，This water controlling valve core 13 convexedly stretches in and has all control lever portions 131 outside room 111 again，This is cut control lever portion 131 and is cased with a passive fluted disc 14 for non-cylindrical cooperation，All control handles 20 have a torsion axostylus axostyle 21，And coordinate a mandrel 210 to be hubbed between the two bearing bracket 12 of pedestal 10 through reversing axostylus axostyle 21，And the front end of this torsion axostylus axostyle 21 is provided with nesting part 211 with the embedding shape in rank，Cooperation group sets a ratcheting unit 22 and forms gearing，This ratcheting unit 22 be provided with a combination wear groove 221 with reverse axostylus axostyle 21 nesting part 211 combine，Wherein the end of nesting part 211 is provided with an inlay card breach 212，Combination is worn groove 221 and is then provided with an inlay card fin 222 in internal diameter，Thus interlock with the most embedding formation of pulling，This ratcheting unit 22 is general in fan shape and be provided with the teeth portion 223 of arc-shaped，More with ratcheting unit 22 and the passive ratcheting drive of fluted disc 14，This is cut control handle 20 and further includes an elastic component 23 again，This elastic component 23 be a scroll spring fit through be placed on torsion axostylus axostyle 21，And it is extended with fixing end 231 and a torsion end 232，This fixing end 231 is resisted against pedestal 10 surface，Reverse end 232 then to coordinate and be fixedly arranged on ratcheting unit 22.
nullThe composition of its structure，For another example Fig. 1 and Fig. 2 coordinates shown in Fig. 3 and Fig. 4，This pedestal 10 is provided installation one water controlling valve core 13 by the room 111 of water outlet valve seat 11，And the control lever portion 131 of cutting of this water controlling valve core 13 convexedly stretches in outside room 111，And overlap a passive fluted disc 14 formation gearing of pulling，With again between two bearing bracket 12, a mandrel 210 installs all control handles 20，This is cut control handle 20 and is cased with an elastic component 23 by reversing axostylus axostyle 21，And set a ratcheting unit 22 with the nesting part 211 groups of front end，And between this nesting part 211 with ratcheting unit 22, more utilize inlay card breach 212 to match with inlay card fin 222 clip，Make, between torsion axostylus axostyle 21 with passive fluted disc 14, there is synchronization rotation status，And this elastic component is set in when reversing axostylus axostyle 21，Its fixing end 231 is resisted against pedestal 10 surface，The torsion end 232 of the other end is then fixedly arranged on ratcheting unit 22，The most again torsion axostylus axostyle 21 is mounted on bearing block 12，And make formed ratcheting with passive fluted disc 14 of teeth portion 223 of ratcheting unit 22 interlock，By said structure，To complete the Switch structure of a kind of faucet.
nullThe state that its structure is actually used，As shown in Figures 4 to 6，This is cut control handle 20 and sets ratcheting unit 22 and the ratcheting gearing of passive fluted disc 14 of water controlling valve core 13 through reversing axostylus axostyle 21 groups，And teeth portion 223 number of teeth of this ratcheting unit 22 is more than passive fluted disc 14，When user is by when cutting control handle 20 switching use，Then can interlock passive fluted disc 14 through ratcheting unit 22 and reach entering of water controlling valve core 13、Go out water state，And the adjustment that this slew range cutting control handle 20 has in angle through teeth portion 223 quantity of ratcheting unit 22，When teeth portion 223 quantity of ratcheting unit 22 is more than passive fluted disc 14，I.e. through the induced way that the large gear turn the small gear，Effectively reduce the switching scope cutting control handle 20，And actually reach boiled water state，Make user can pull in more labour-saving mode and cut control handle 20，When otherwise teeth portion 223 quantity of ratcheting unit 22 is less than passive fluted disc 14，Then can strengthen the switching scope cutting control handle 20，This is cut control handle 20 and is more cased with an elastic component 23 by torsion axostylus axostyle 21 again，When cutting control handle 20 and reversing away from pedestal 10 because of boiled water，The torsion end 232 of its elastic component 23 can rotate along with ratcheting unit 22 and form compressive state，Therefore when user loosens and cuts control handle 20，Can make through elastic component 23 elastic reset again to cut control handle 20 toward the gradually closing of pedestal 10 direction，And then interlock ratcheting unit 22 again and reversely drive passive fluted disc 14，Form the state of water controlling valve core 13 automatic turning off water，Have water-saving effect concurrently.
nullAnother embodiment of its structure，As shown in Figure 7 and Figure 8，This pedestal 10 has a water outlet valve seat 11 and and is arranged in the spacing slide rail 15 of water outlet valve seat 11 side，This is cut control handle 20 and has a torsion axostylus axostyle 21，Set a ratcheting unit 22 for group and form gearing，This ratcheting unit 22 be provided with a combination wear groove 221 with reverse axostylus axostyle 21 combine，And this torsion axostylus axostyle 21 end is provided with an inlay card breach 212，Combination is worn groove 221 and is then provided with an inlay card fin 222 in internal diameter，Thus the most embedding to torsion axostylus axostyle 21 and ratcheting unit 22 formation of pulling is interlocked with inlay card fin 222 through inlay card breach 212，It is connected a rail bar 24 again by torsion axostylus axostyle 21 end，And rail bar 24 fitted through be located in limit sliding chutes 15，This general T-shaped shape of ratcheting unit 22 has horizontal teeth portion 223 again，More with ratcheting unit 22 and the passive ratcheting drive of fluted disc 14.
nullIn sum，When its structure is actually used，Control handle 20 is cut in i.e. force promotion，And with sliding start in the rail bar 24 limit sliding chutes 15 outside water outlet valve seat 11，The teeth portion 223 making ratcheting unit 22 horizontal is ratcheting with driven gear 14 and has a drive state，Then can interlock passive fluted disc 14 through ratcheting unit 22 and reach entering of water controlling valve core 13、Go out water state，And the adjustment that this slew range cutting control handle 20 has in angle through teeth portion 223 quantity of ratcheting unit 22，When teeth portion 223 quantity of ratcheting unit 22 is more than passive fluted disc 14，I.e. through the induced way that the large gear turn the small gear，Effectively reduce the switching scope cutting control handle 20，And actually reach boiled water state，Allow a user to pull in more labour-saving mode and cut control handle 20，When otherwise teeth portion 223 quantity of ratcheting unit 22 is less than passive fluted disc 14，Then can strengthen the switching model garden cutting control handle 20.
nullAnother two embodiments of its structure，As shown in Figure 9 and Figure 10，This pedestal 10 has a water outlet valve seat 11 and two with the longitudinally asymmetric bearing block 12 being mounted on water outlet valve seat 11 outer wall，This is cut control handle 20 and has a torsion axostylus axostyle 21，Set a ratcheting unit 22 for group and form gearing，This ratcheting unit 22 is general in screw shaped and to be longitudinally mounted between two bearing bracket 12，And this ratcheting unit 22 peripheral ring is provided with spiral helicine teeth portion 223，More with ratcheting unit 22 and the passive ratcheting drive of fluted disc 14，And be provided with a combination protuberance 224 bottom this ratcheting unit 22 and combine with reversing axostylus axostyle 21，And torsion axostylus axostyle 21 end is provided with an inlay card breach 212，For combination protuberance 224 embedding pull fixing，And through a latch fitting 213 run through torsion axostylus axostyle 21 and ratcheting unit 22 and lock formation interlock.
In sum, when its structure is actually used, i.e. by cutting control handle 20 switching start, make ratcheting unit 22 form a spiral shell and move rotation status, and interlock passive fluted disc 14 reach entering of water controlling valve core 13 through spiral helicine teeth portion 223, go out water state, and the adjustment that this slew range cutting control handle 20 has in angle through the teeth portion 223 spacing size of ratcheting unit 22, when teeth portion 223 spacing of ratcheting unit 22 is bigger, the induced way of little gear is i.e. driven through big screw rod, effectively reduce the switching scope cutting control handle 20, and actually reach boiled water state, make user can pull in more labour-saving mode and cut control handle 20, otherwise when teeth portion 223 spacing of ratcheting unit 22 is less, then can strengthen the switching scope cutting control handle 20.
Structure by above-mentioned specific embodiment, available following benefit: faucet of the present utility model is mainly in cutting between control handle 20 and water controlling valve core 13 through ratcheting unit 22 and the passive ratcheting gearing of fluted disc 14, and the number of teeth of this ratcheting unit 22, diameter are both greater than passive fluted disc 14, then to constitute the large gear turn the small gear switching mode, can not only effectively reduce and cut control handle 20 switching scope, really can reach boiled water state by linkage water-control spool simultaneously, control handle 20, the convenience of lift structure use and practicality can be cut with more labour-saving mode switching, control.
Above explanation and embodiment are only exemplary, scope of the present utility model are not constituted any restriction.It will be understood by those skilled in the art that and the details of technical solutions of the utility model and form can be modified or replace under without departing from spirit and scope of the present utility model, but these amendments and replacement each fall within protection domain of the present utility model.
Claims (16)
1. the Switch structure of a faucet, it is characterised in that it comprises:
One pedestal, this pedestal has a water outlet valve seat and two and is parallelly mounted to the bearing block outside water outlet valve seat, this water outlet valve seat has a room for providing installation one water controlling valve core, and this water controlling valve core convexedly stretches in and has all control lever portions outside this room, this is cut control lever portion and is non-cylindrical and cooperation is cased with a passive fluted disc；
All control handle, this is cut control handle and has a torsion axostylus axostyle, and be hubbed at through torsion axostylus axostyle between two bearing blocks of pedestal, the front end of this torsion axostylus axostyle is provided with nesting part with the embedding shape in rank, cooperation group sets a ratcheting unit and forms gearing, this ratcheting unit is fan shape the teeth portion being provided with arc-shaped, this ratcheting unit and the ratcheting drive of passive fluted disc.
The Switch structure of faucet the most according to claim 1, it is characterised in that what this water outlet valve seat was corresponding a be provided with outlet passage and two water inlet flow channels, this outlet passage and two water inlet flow channels are all communicated to room and are formed and communicate.
The Switch structure of faucet the most according to claim 2, it is characterised in that this ratcheting unit is provided with the nesting part combination that a combination is worn groove and reversed axostylus axostyle.
The Switch structure of faucet the most according to claim 3, it is characterised in that the end of this nesting part is provided with an inlay card breach, this combination is worn groove and is provided with an inlay card fin with the most embedding formation gearing of pulling in inner radius.
The Switch structure of faucet the most according to claim 4, it is characterised in that this slew range cutting control handle can be adjusted by the teeth portion quantity of ratcheting unit in angle.
6. according to the Switch structure of the faucet described in any one of claim 1 to 5, it is characterized in that, also comprise an elastic component, this elastic component is that a scroll spring fits through and is placed on torsion axostylus axostyle, this elastic component is extended with a fixing end and and reverses end, this fixing end is resisted against base-plates surface, and this torsion end then coordinates and is fixedly arranged on ratcheting unit.
7. the Switch structure of a faucet, it is characterised in that it comprises:
One pedestal, this pedestal has a water outlet valve seat and and is arranged in the spacing slide rail of water outlet valve seat side, this water outlet valve seat has a room, there is provided and a water controlling valve core is installed, and this water controlling valve core convexedly stretches in and has all control lever portions outside room, this is cut control lever portion and is non-cylindrical and cooperation is cased with a passive fluted disc；
All control handle, this is cut control handle and has a torsion axostylus axostyle and set a ratcheting unit for group and formed and interlock, and this torsional axis boom end is connected a rail bar, and is fitted through by rail bar and be located in limit sliding chutes, this T-shaped shape of ratcheting unit has horizontal teeth portion again, this ratcheting unit and the ratcheting drive of passive fluted disc.
The Switch structure of faucet the most according to claim 7, it is characterised in that this water outlet valve seat be correspondingly provided with an outlet passage and two water inlet flow channels, this outlet passage and two water inlet flow channels be all communicated to room formed communicate.
9. according to the Switch structure of the faucet described in claim 7 or 8, it is characterised in that this ratcheting unit is provided with a combination and wears groove and reverse axostylus axostyle combination.
The Switch structure of faucet the most according to claim 9, it is characterised in that this torsion axostylus axostyle is provided with an inlay card breach in end, this combination is worn groove and is provided with an inlay card fin thus with the most embedding formation gearing of pulling in inner radius.
The Switch structure of 11. faucet according to claim 10, it is characterised in that this slew range cutting control handle can be adjusted by the teeth portion quantity of ratcheting unit in angle.
The Switch structure of 12. 1 kinds of faucet, it is characterised in that it comprises:
One pedestal, this pedestal has a water outlet valve seat and two with the longitudinally asymmetric bearing block being mounted on water outlet valve seat outer wall, this water outlet valve seat has a room, there is provided and a water controlling valve core is installed, and this water controlling valve core convexedly stretches in and has all control lever portions outside room, this is cut control lever portion and is non-cylindrical and cooperation is cased with a passive fluted disc；
All control handle, this cut control handle have a torsion axostylus axostyle for group set one ratcheting unit formed interlock, this ratcheting unit is screw shaped and is longitudinally mounted between two bearing blocks, and this ratcheting unit peripheral ring is provided with spiral helicine teeth portion, this ratcheting unit and the ratcheting drive of passive fluted disc.
The Switch structure of 13. faucet according to claim 12, it is characterised in that this water outlet valve seat be correspondingly provided with an outlet passage and two water inlet flow channels, this outlet passage and two water inlet flow channels be all communicated to room formed communicate.
14. according to the Switch structure of the faucet described in claim 12 or 13, it is characterised in that this ratcheting unit bottom is provided with a combination protuberance and reverses axostylus axostyle combination.
The Switch structure of 15. faucet according to claim 14, it is characterised in that torsional axis boom end be provided with an inlay card breach for combination protuberance embedding pull fixing, and through a latch fitting run through locking formed interlock.
The Switch structure of 16. faucet according to claim 15, it is characterised in that this slew range cutting control handle is sized in angle adjust by the teeth portion spacing of ratcheting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620116872.9U CN205534520U (en) | 2016-02-05 | 2016-02-05 | Tap's change over switch structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620116872.9U CN205534520U (en) | 2016-02-05 | 2016-02-05 | Tap's change over switch structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205534520U true CN205534520U (en) | 2016-08-31 |
Family
ID=56778152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620116872.9U Expired - Fee Related CN205534520U (en) | 2016-02-05 | 2016-02-05 | Tap's change over switch structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205534520U (en) |
-
2016
- 2016-02-05 CN CN201620116872.9U patent/CN205534520U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20190205 |
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| CF01 | Termination of patent right due to non-payment of annual fee |