CN204002128U - Anti-locking disabling device and lockset - Google Patents
Anti-locking disabling device and lockset Download PDFInfo
- Publication number
- CN204002128U CN204002128U CN201420347632.0U CN201420347632U CN204002128U CN 204002128 U CN204002128 U CN 204002128U CN 201420347632 U CN201420347632 U CN 201420347632U CN 204002128 U CN204002128 U CN 204002128U
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- Prior art keywords
- shift fork
- driving member
- safety pole
- locking
- fork
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- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000002360 explosive Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Lock And Its Accessories (AREA)
Abstract
The utility model relates to a kind of anti-locking disabling device and lockset, wherein this anti-locking disabling device comprises the locking closure with accommodating cavity, the driving member that be arranged in described accommodating cavity, slides up and down in described accommodating cavity, and the shift fork being in transmission connection with described driving member; Described shift fork comprises shift fork main body and the safety pole being connected with described shift fork main body elasticity; On described locking closure, offer the stopper slot for safety pole described in inlay card; When described driving member moves, described safety pole is pushed away from described stopper slot, drive described shift fork main body to move.Implement anti-locking disabling device of the present utility model and lockset, shift fork is merely able to be driven by driving member, thereby has avoided shift fork to move under the weight of latch fitting drives, the situation that causes locking to lose efficacy, thereby improved the reliability of lockset, guaranteed that lockset can open sealed normally.
Description
Technical field
The utility model relates to lockset, more particularly, relates to a kind of anti-locking disabling device and uses the lockset of this anti-locking disabling device.
Background technology
In existing lockset, there is a class to be mounted in the lockset of push-pull door and window, as depicted in figs. 1 and 2.In the framework 1 of door and window, lockset is installed, the driving member 2 of lockset drives the shift fork 4 in lockset to move up and down, and shift fork 4 drives latch fitting 3 to slide in framework 1, thus the switching that realizes locking and open two states.
From Fig. 1, Fig. 2, can find out the problem that this lockset exists: due to the structure needs of push-pull door and window, lockset needs vertically to place, and latch fitting 3 self gravitations are excessive, under the Action of Gravity Field of self, can drive shift fork 4 to glide, lockset locking was lost efficacy, cannot realize the original function of lockset.If strengthen the frictional force of shift fork 4 on lockset, can be so that shift fork 4 cannot be driven by the self gravitation of latch fitting 3, still such setting can hinder the operation of 2 pairs of shift forks 4 of driving member again, makes lockset operation inconvenience.
Utility model content
The purpose of this utility model is, the problem that exists locking to lose efficacy for existing lockset provides a kind of device of anti-locking inefficacy and the lockset that uses this anti-locking disabling device, to overcome the defect in existing lockset.
The utility model solution of the above problems is as follows: construct a kind of anti-locking disabling device, comprise the locking closure with accommodating cavity, the driving member that is arranged in described accommodating cavity and can slides up and down in described accommodating cavity, and the shift fork being in transmission connection with described driving member; Described shift fork comprises shift fork main body and the safety pole being connected with described shift fork main body elasticity; On described locking closure, offer the stopper slot for safety pole described in inlay card; On described shift fork, be provided with projection, on described driving member, be provided with the mouth of stirring of projection described in inlay card, when described driving member moves from top to bottom, described safety pole is pushed away from described stopper slot, described inwall and the mutual butt of the projection on shift fork of stirring mouth, described driving member drives described shift fork main body to move.
Anti-locking disabling device of the present utility model, wherein said shift fork also comprises guide, offers the gathering sill moving up and down for shift fork main body on described guide.
Anti-locking disabling device of the present utility model, described shift fork main body comprises fork plate, and described fork plate extends C shape lock fork near a side of guide, and the width of described gathering sill is greater than the width of described C shape lock fork, and C shape lock fork is through gathering sill; Fork plate extends upper ledge and the lower protrusion for driving for driving member away from a side of guide; On described fork plate, be also provided with blind hole between upper ledge and lower protrusion, described safety pole by spring fitting in described blind hole.
Anti-locking disabling device of the present utility model, described driving member comprises to be stirred mouth and sets aside and open one's mouth, described upper ledge is embedded into stirs in mouth, during lower protrusion is embedded into and sets aside and open one's mouth, described driving member also comprises the safety pole screens hole corresponding to described safety pole position, projection piece is extended at upper end-face edge place, described safety pole screens hole, and when described driving member moves from top to bottom, described projection piece heads into safety pole (7) in blind hole.
Anti-locking disabling device of the present utility model, offers counter sink on described guide, on described locking closure, offers screwed hole, and screw is through after counter sink and screwed hole, guide and locking closure being fixed together.
Anti-locking disabling device of the present utility model, safety pole comprises inclined-plane upward, the upper inside wall in safety pole screens hole is inclined-plane down.
The utility model also provides a kind of lockset, and lockset is arranged in framework, also comprises the anti-locking disabling device being arranged in framework.
Lockset of the present utility model, wherein said shift fork also comprises guide, offers the gathering sill moving up and down for shift fork main body on described guide.
Lockset of the present utility model, described shift fork main body comprises fork plate, and described fork plate extends C shape lock fork near a side of guide, and C shape lock fork, through after gathering sill, moves up and down in gathering sill; Fork plate extends upper ledge and the lower protrusion for driving for driving member away from guide side; On described fork plate, be also provided with blind hole between upper ledge and lower protrusion, described safety pole by spring fitting in described blind hole.
Lockset of the present utility model, described driving member comprises to be stirred mouth and sets aside and open one's mouth, described upper ledge is embedded into stirs in mouth, during lower protrusion is embedded into and sets aside and open one's mouth, described driving member also comprises the safety pole screens hole corresponding to described safety pole position, projection piece is extended at upper end-face edge place, described safety pole screens hole, and when described driving member moves from top to bottom, described projection piece heads into safety pole in blind hole.
Lockset of the present utility model, offers counter sink on described guide, on described the second locking closure, offers screwed hole, and screw is through after counter sink and screwed hole, guide and the second locking closure being fixed together.
Anti-locking disabling device of the present utility model, safety pole comprises inclined-plane upward, the upper inside wall in safety pole screens hole is inclined-plane down.
Implement anti-locking disabling device of the present utility model and lockset, shift fork is merely able to be driven by driving member, thereby has avoided shift fork to move under the weight of latch fitting drives, the situation that causes locking to lose efficacy, thereby improved the reliability of lockset, guaranteed that lockset can open sealed normally.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of lockset in prior art;
Fig. 2 is the partial structurtes schematic diagram of Fig. 1 lockset;
Fig. 3 is the utility model lockset explosive view of preferred embodiment first;
Fig. 4 is the front schematic view of anti-locking disabling device in Fig. 3 embodiment;
Fig. 5 be Fig. 4 embodiment along A-A to sectional view;
Fig. 6 is the enlarged diagram in B region in Fig. 5;
Fig. 7 is the utility model shift fork schematic perspective view of preferred embodiment first;
Fig. 8 is the rear view of Fig. 7 shift fork;
Fig. 9 is that Fig. 8 shift fork is along the sectional view of dotted line;
Figure 10 is the utility model schematic perspective view of the driving member of preferred embodiment first;
Figure 11 is the enlarged diagram in C region in Figure 10 driving member;
Figure 12 is the utility model schematic perspective view of the second locking closure of preferred embodiment first;
Figure 13 is the enlarged diagram in D region in Figure 12 the second locking closure.
The specific embodiment
The utility model is for the situation that cannot prevent in existing lockset that locking lost efficacy, shift fork in lockset, driving member are improved, in shift fork, increase safety pole, when shift fork moves to the top of lockset, safety pole is stuck in a default groove position, makes the weight of latch fitting self cannot drive shift fork to move down, and only has and when driving member moves, can make safety pole shift out in groove position, further drive shift fork to move down, thereby prevent that locking lost efficacy.
For the structure in clearer explanation the present embodiment, now with the specific embodiment, the utility model is further detailed by reference to the accompanying drawings.
Be illustrated in figure 3 the utility model explosive view of preferential embodiment first.This embodiment is a lockset that has used the anti-locking disabling device that the utility model provides.This lockset is arranged in the framework 1 of a door and window, comprises that the first locking closure 5 and the second locking closure 6, the first locking closures 5 are arranged on respectively on two relative sides of framework 1 with the second locking closure 6, and by screw, the first locking closure 5 and the second locking closure 6 is interfixed.On the second locking closure 6, offer accommodating cavity, accommodating cavity is used for placing driving member 2 and shift fork 4, driving member 2 and shift fork 4 can slide up and down by the accommodating cavity in the second locking closure 6, and driving member 2 and shift fork 4 are in transmission connection, on shift fork 4, be provided with projection, on driving member 2, be provided with the mouth of stirring of this projection of inlay card, in the time of slip driving member 2, stir the inwall of mouth and the mutual butt of projection on shift fork 4, thereby realize by driving member 2, drive shift forks 4 to slide up and down.And shift fork 4 and the mutual clamping of latch fitting 3, when shift fork 4 moves up and down, drive latch fitting 3 moves up and down in a side of framework 1, thereby realizes the state switching of lockset.After installing, lockset will be as shown in Figure 4, only operates driving member 2 and just can control latch fitting 3.
The function losing efficacy in order to demonstrate more clearly anti-locking that shift fork 4 has in mobile process, existing in conjunction with the sectional view of Fig. 5 and the cutaway view Amplified image of Fig. 6, to shift fork, the motion conditions in lockset describes.Be illustrated in figure 5 Fig. 4 along A-A to sectional view, Fig. 6 is the partial enlarged drawing of the circle of label B in Fig. 5.
As shown in Figure 5 and Figure 6, on shift fork 4, near a side of the second locking closure 6, safety pole 7 is installed, safety pole 7 is connected on shift fork 4 by a spring 8.When shift fork 4 moves to the top of the second locking closure 6 inner accommodating cavities, safety pole 7 snaps in notch 61 reserved on the second locking closure 6 under the elastic force effect of spring 8, once safety pole 7 snaps in notch 61, the gravity of latch fitting 3 self just cannot drive shift fork 4 to move down.And when wanting mobile shift fork 4, only have by mobile driving member 2, first safety pole 7 is ejected from notch 61, make safety pole 7 no longer be subject to stopping of notch 61, driving member 2 just can drive shift fork 4 to glide, thereby realizes mobile latch fitting 3.And in the time of reverse operating, driving member 2 drives on shift fork 4 and moves, when shift fork 4 arrives the top of accommodating cavity, safety pole 7 moves on the correspondence position of notch 61 just, and under the elastic force effect of spring 8, safety pole 7 snaps in notch 61, the position of shift fork 4 in accommodating cavity is defined, cannot be driven by the gravity of latch fitting 3, thereby realized, prevent that locking lost efficacy.
And to snap in order to realize above-mentioned safety pole 7 effect of notch 61, shift fork 4, the second locking closure 6 and driving member 2 all need structurally to improve.
If Fig. 7 to Fig. 9 is the structural representation of preferred implementation first of shift fork 4.Wherein Fig. 7 is the three-dimensional structure diagram of shift fork 4, and the shift fork 4 that Fig. 8 is Fig. 7 is from the lateral view near safety pole 7 one sides, and Fig. 8 is that Fig. 7 is along the sectional view of dotted line.Shift fork 4 comprises two parts: shift fork main body and guide 42, guide 42 is for limiting the moving range of shift fork main body.Guide 42 is a metal sheet, offers the gathering sill 422 moving up and down for the main part for shift fork 4 on guide 42.For convenience of description, when position as shown in Figure 9 of shift fork 4, be defined as shift fork 4 and be positioned at upper end, when shift fork 4 slides into other one end of gathering sill 422 along gathering sill 422, be defined as shift fork 4 and be positioned at lower end.For the shift fork main body of shift fork 4 can be driven by transmission part 2, and further drive latch fitting 3 to move up and down, shift fork 4 has following structure in the present embodiment: shift fork main body comprises fork plate 40, fork plate 40 extends C shape lock fork 41 near a side of guide 42, C shape lock fork 41, through gathering sill 422, can move up and down in gathering sill 422.And extend two projections in an other side of fork plate 40, i.e. upper ledge 43 and lower protrusion 44, these two projections, for driving for driving member 2, when driving member 2 moves down from upper end, are stirred upper ledge 43, drive shift fork 4 to move down; And on the other hand, when driving member 2 up moves from lower end, stir lower protrusion 44, drive on shift fork 4 and move.
And between two projections, the middle part that is positioned at fork plate 40 offers a blind hole 45, safety pole 7 is installed in this blind hole 45 by spring 8, when safety pole 7 is under pressure, in can retraction blind hole 45, after pressure removes, safety pole 7 ejects from blind hole 45.In the present embodiment, safety pole 7 is an inclined-plane away from the end face of fork plate 40, and inclined-plane upward, and when guaranteeing that shift fork 4 is positioned at upper end, safety pole 7 can snap in reserved groove position, can not driven and move down by the gravity of latch fitting 3.
Except the structure of shift fork 4 need to improve, in order to realize the effect that prevents locking, for driving member 2 and the second locking closure 6, all need to carry out corresponding improvement.
Be the structural representation of the driving member 2 of the present embodiment as shown in Figure 10 and Figure 11, wherein Figure 10 is the perspective view of driving member 2; Figure 11 is the enlarged diagram in C region in Figure 10.In driving member 2 upper ends, corresponding to the position of two projections on shift fork 4, offer respectively and stir mouth, stir mouthfuls 23 and set aside and open one's mouth 24 on.When correct install lockset after, upper ledge 43 is embedded into stirs in mouthfuls 23, lower protrusion 44 is embedded into set aside opens one's mouth in 24.When user operates driving member 2 and moves down, above stir mouthfuls 23 internal side wall and upper ledge 43 butts, thereby drive shift fork 4 moves down; On the other hand, when user operates when moving on driving member 2, set aside open one's mouth 24 internal side wall and lower protrusion 44 butts, thereby drive on shift fork 4, move.In addition, on driving member 2, also offer safety pole screens hole 22, when safety pole screens hole 22 is positioned at shift fork 4 and arrives topmost on the correspondence position of safety pole 7, when shift fork 4 is struck to the top, safety pole 7 can spring in safety pole screens hole 22 under the elastic force effect of spring 8.Top edge in safety pole screens hole 22 is also provided with a projection piece 21, and projection piece 21 for pushing into safety pole 7 blind hole 45 of shift fork 4 when driving member 2 moves down.Preferably, in order to guarantee can comparatively smoothly safety pole 7 to be headed in the blind hole 45 of shift fork 4 when driving member 2 moves down, upper inner face and the projection piece 21 in safety pole screens hole 22 are all arranged to the inclined-plane matching with safety pole 7, when driving member 2 moves down, the interaction on inclined-plane can more easyly push away safety pole screens hole 22 by safety pole 7.
Be the structural representation of the second locking closure 6 in the present embodiment as shown in Figure 12 and Figure 13, wherein Figure 12 is the perspective view of the second locking closure 6, and Figure 13 is the enlarged diagram in D region in Figure 12.The second locking closure 6 comprises an accommodating cavity 63, and accommodating cavity 63 is for placing driving member 2 and shift fork 4.On accommodating cavity 63, offer stopper slot 61.When moving to topmost on driving member 2 drive shift forks 4, safety pole 7, through safety pole screens hole 22, snaps onto in stopper slot 61, makes whole shift fork 4 fixing with respect to the second locking closure 6, and latch fitting 3 cannot drive safety pole 7 to move down by the gravity of self.
More than provided shift fork 4, driving member 2 and the second locking closure 6 structure separately, below how these assemblies of explanation have been formed to the device that anti-locking lost efficacy: at the interior placement driving member 2 of accommodating cavity 63, driving member 2 can slide up and down in accommodating cavity 63.On the guide 42 of the second locking closure 6 and shift fork 4, counter sink and screwed hole are set respectively, the second locking closure 6 near the counter sink 62 of upper position and guide 42 screwed hole 421 near upper position.Screw is through after counter sink 62 and screwed hole 421, guide 42 and the second locking closure 6 being fixed together.When driving member 2 moves up and down, drive shift fork main body to move.When driving member 2 moves to the top of accommodating cavity, safety pole 7 snaps in stopper slot 61, whole shift fork 4 is maintained static, when driving member 2 moves down with respect to the second locking closure 6, safety pole 7 is pushed away to stopper slot 61, and shift fork main body can move under the drive of driving member 2.
In the time of due to the above-mentioned anti-locking device of employing and lockset, shift fork 4 is merely able to be driven by driving member 2, thereby has avoided shift fork 4 to move under the weight of latch fitting 3 drives, the situation that causes locking to lose efficacy, thereby improved the reliability of lockset, guaranteed that lockset can open sealed normally.
These are only the utility model specific embodiment, can not limit scope of the present utility model with this, equalization that those skilled in the art in the art do according to this creation changes, and the change known of those skilled in that art, all should still belong to the scope that the utility model is contained.
Claims (10)
1. an anti-locking disabling device, is characterized in that, comprises the locking closure with accommodating cavity (63), is arranged in described accommodating cavity (63) and the driving member (2) that can slide up and down in described accommodating cavity (63), and shift fork (4); Described shift fork (4) comprises shift fork main body and the safety pole (7) being connected by spring (8) with described shift fork main body; On described locking closure, offer the stopper slot (61) for safety pole described in inlay card (7); On described shift fork (4), be provided with projection, on described driving member (2), be provided with the mouth of stirring of projection described in inlay card, when described driving member (2) moves from top to bottom, described safety pole (7) is pushed away from described stopper slot (61), the described inwall of mouth and the mutual butt of projection on shift fork (4) stirred, described driving member (2) drives described shift fork main body to move.
2. anti-locking disabling device according to claim 1, is characterized in that, described shift fork (4) also comprises guide (42), offers the gathering sill (422) moving up and down for described shift fork main body on described guide (42).
3. anti-locking disabling device according to claim 2, it is characterized in that, described shift fork main body comprises fork plate (40), described fork plate (40) extends C shape lock fork (41) near a side of described guide (42), the width of described gathering sill (422) is greater than the width of described C shape lock fork (41), and described C shape lock fork (41) is through described gathering sill (422); Described fork plate (40) extends upper ledge (43) and the lower protrusion (44) for driving for driving member (2) away from a side of guide (42); On described fork plate, between upper ledge (43) and lower protrusion (44), be also provided with blind hole (45), described safety pole (7) is arranged in described blind hole (45) by spring (8).
4. anti-locking disabling device according to claim 3, it is characterized in that, described driving member (2) comprises to be stirred mouthful (23) and sets aside open one's mouth (24), described upper ledge (43) is embedded into stirs in mouthful (23), described lower protrusion (44) is embedded into set aside opens one's mouth in (24), described driving member (2) also comprises the safety pole screens hole (22) corresponding to described safety pole (7) position, projection piece (21) is extended at upper end-face edge place, described safety pole screens hole (22), when described driving member (2) moves from top to bottom, described projection piece (21) heads into safety pole (7) in blind hole (45).
5. anti-locking disabling device according to claim 4, is characterized in that, described safety pole (7) comprises inclined-plane upward, and the upper inside wall in described safety pole screens hole (22) is inclined-plane down.
6. according to the arbitrary described anti-locking disabling device of claim 2-5, it is characterized in that, on described guide (42), offer counter sink (421), on described locking closure, offer screwed hole (62), screw is fixed together guide (42) and locking closure afterwards through counter sink (421) and screwed hole (62).
7. a lockset, is arranged on framework (1) upper, it is characterized in that, comprise anti-locking disabling device as claimed in claim 1, described anti-locking disabling device is arranged in described framework (1).
8. lockset according to claim 7, is characterized in that, described shift fork (4) also comprises guide (42), offers the gathering sill (422) moving up and down for shift fork main body on described guide (42).
9. lockset according to claim 8, it is characterized in that, described shift fork main body comprises fork plate (40), described fork plate (40) extends C shape lock fork (41) near a side of described guide (42), the width of described gathering sill (422) is greater than the width of described C shape lock fork (41), and described C shape lock fork (41) is through described gathering sill (422); Described fork plate (40) extends upper ledge (43) and the lower protrusion (44) for driving for driving member (2) away from a side of guide (42); On described fork plate, between upper ledge (43) and lower protrusion (44), be also provided with blind hole (45), described safety pole (7) is arranged in described blind hole (45) by spring (8).
10. lockset according to claim 9, it is characterized in that, described driving member (2) comprises to be stirred mouthful (23) and sets aside open one's mouth (24), described upper ledge (43) is embedded into stirs in mouthful (23), described lower protrusion (44) is embedded into set aside opens one's mouth in (24), described driving member (2) also comprises the safety pole screens hole (22) corresponding to described safety pole (7) position, projection piece (21) is extended at upper end-face edge place, described safety pole screens hole (22), when described driving member (2) moves from top to bottom, projection piece (21) heads into safety pole (7) in blind hole (45).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420347632.0U CN204002128U (en) | 2014-06-26 | 2014-06-26 | Anti-locking disabling device and lockset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420347632.0U CN204002128U (en) | 2014-06-26 | 2014-06-26 | Anti-locking disabling device and lockset |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204002128U true CN204002128U (en) | 2014-12-10 |
Family
ID=52042151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420347632.0U Expired - Lifetime CN204002128U (en) | 2014-06-26 | 2014-06-26 | Anti-locking disabling device and lockset |
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| Country | Link |
|---|---|
| CN (1) | CN204002128U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108442827A (en) * | 2018-05-18 | 2018-08-24 | 深圳好博窗控技术有限公司 | Draw high a letter lock |
-
2014
- 2014-06-26 CN CN201420347632.0U patent/CN204002128U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108442827A (en) * | 2018-05-18 | 2018-08-24 | 深圳好博窗控技术有限公司 | Draw high a letter lock |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180508 Address after: 518000 Guangdong Shenzhen Guangming New District Gongming office, Hongxing community, two Star Road 6, 1 floor, A and 6 Patentee after: SHENZHEN HOPO WINDOW CONTROL TECHNOLOGY Co.,Ltd. Address before: 518000 10 Nanshan District Road, Gaoxin south, Nanshan District, Shenzhen, Guangdong. Patentee before: Li Zengbang |
|
| TR01 | Transfer of patent right | ||
| CP03 | Change of name, title or address |
Address after: Area a and 6 / F, 1st floor, No.6 Xinggong 2nd Road, Hongxing community, Yutang street, Guangming District, Shenzhen, Guangdong Province Patentee after: Shenzhen Haobo Window Control Technology Co.,Ltd. Address before: 518000 Guangdong Shenzhen Guangming New District Gongming office, Hongxing community, two Star Road 6, 1 floor, A and 6 Patentee before: SHENZHEN HOPO WINDOW CONTROL TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141210 |
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| CX01 | Expiry of patent term |