CN207449797U - A kind of electromagnetic unlocking device and ceiling display - Google Patents
A kind of electromagnetic unlocking device and ceiling display Download PDFInfo
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- CN207449797U CN207449797U CN201721564432.0U CN201721564432U CN207449797U CN 207449797 U CN207449797 U CN 207449797U CN 201721564432 U CN201721564432 U CN 201721564432U CN 207449797 U CN207449797 U CN 207449797U
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- Prior art keywords
- mounting base
- lockable mechanism
- unlocking device
- electromagnetism
- sliding block
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- 230000007704 transition Effects 0.000 claims description 5
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 9
- 230000005484 gravity Effects 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The utility model proposes a kind of electromagnetic unlocking device and ceiling displays, its electromagnetic unlocking device includes mounting base, the lockable mechanism being arranged in mounting base, resetting-mechanism and electromagnetism unlocking mechanism, lockable mechanism is rotatablely connected with mounting base, the first end of lockable mechanism is provided with latch hook and stretches out mounting base, resetting-mechanism coordinates lockable mechanism is promoted to be maintained at lockup state with lockable mechanism, electromagnetism unlocking mechanism includes electromagnetism push rod, and electromagnetism push rod is used to that lockable mechanism to be promoted to release lockup state.When the electromagnetic unlocking device is applied to ceiling display, mounting base is fixed on the pedestal of ceiling display, latch hook is stretched out to be coordinated with the hanging groove set on display screen, after display screen is packed up, latch hook keeps coordinating with hanging groove under the action of resetting-mechanism, display screen is made to be maintained at lockup state, eliminates the reciprocal torque that gravity generates after display screen is withdrawn, improves the reliability of product.When needing unlock, the unlocking mechanism action of control electromagnetism releases lockup state, easy to control.
Description
Technical field
The utility model is related to arrive extraordinary display device technical field, in particular to a kind of electromagnetic unlocking device and
Ceiling display.
Background technology
In extraordinary field of display devices, such as ceiling display, more and more it is used on vehicle-mounted or airborne platform,
Due to it is vehicle-mounted or it is airborne belong to vibration environment, this requires its display screen can be locked when unused and can have certain antivibration to arrange
It applies.At present, the display screen of ceiling display is mostly using motor-locking, when ceiling display is not used also by electromechanical locks
Fixed, this mode is although simple in structure, but in vibration environment, for display screen always by gravity, countershaft generates one
Reciprocal torque, this torque can be applied on motor always, seriously affect the service life of motor, cause the reliability of product not
It is high.
Therefore, how to eliminate ceiling display display screen withdraw after the reciprocal torque that generates of gravity, that improves product can
By property, the technical issues of becoming those skilled in the art's urgent need to resolve.
Utility model content
In consideration of it, the utility model proposes a kind of electromagnetic unlocking device and ceiling display, to eliminate ceiling display
Display screen withdraw after the reciprocal torque that generates of gravity, improve the reliability of product.
On the one hand, the utility model proposes a kind of electromagnetic unlocking device, including mounting base, be arranged in the mounting base
Lockable mechanism, resetting-mechanism and electromagnetism unlocking mechanism, the lockable mechanism and the mounting base be rotatablely connected, the locking machine
The first end of structure is provided with latch hook and stretches out the mounting base, and the resetting-mechanism coordinates to promote described with the lockable mechanism
Lockable mechanism is maintained at lockup state, and the electromagnetism unlocking mechanism includes electromagnetism push rod, and the electromagnetism push rod is described for promoting
Lockable mechanism releases lockup state.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that the resetting-mechanism include resetting spring and
It is slideably positioned in the sliding block of the mounting base, one end of the resetting spring is against the mounting base, and the other end is against the cunning
Block, the sliding block coordinate with the lockable mechanism.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that the second end of the lockable mechanism is provided with
Drive link offers notch on the sliding block, and the drive link is stretched into the notch.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that the mounting base is axially disposed one end
First mounting hole of closing, the resetting spring and the sliding block are arranged in first mounting hole, and the sliding block is vertically
The second mounting hole of one end closing is provided with, the both ends of the resetting spring are located at first mounting hole and the second installation respectively
In hole.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that the electromagnetism unlocking mechanism is fixed on described
In mounting base, and positioned at first mounting hole perforate end, the electromagnetism push rod stretch into first mounting hole and with it is described
Sliding block coordinates, to release lockup state by lockable mechanism described in the slipper push.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that be fixedly installed shaft in the mounting base
, shaft is provided on the shaft seat, the lockable mechanism is sheathed in the shaft, and the lockable mechanism passes through described turn
Axis is rotatablely connected with the mounting base, and the latch hook stretches out the shaft seat.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that the mounting base be cuboid, described first
Mounting hole and the second mounting hole are circular hole, and opening corresponding with the notch is provided on the cuboid.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that be provided in the middle part of the lockable mechanism with
The shaft hole of shaft cooperation, the middle part of the lockable mechanism is towards the one side arc transition of the resetting spring, the lock
One side of the middle part of locking mechanism away from the resetting spring is provided with motion-stopping surface.
As the improvement of above-mentioned electromagnetic unlocking device on the one hand, it is preferable that the latch hook outer end is provided with guiding surface.
On the other hand, the utility model also proposed a kind of ceiling display, including pedestal and display screen, further include above-mentioned
Any electromagnetic unlocking device, the mounting base are fixed on the pedestal, and the hanging groove of the latch hook and the display screen coordinates.
A kind of electromagnetic unlocking device and ceiling display provided by the utility model, electromagnetic unlocking device include installation
Seat, lockable mechanism, resetting-mechanism and the electromagnetism unlocking mechanism being arranged in mounting base, lockable mechanism are rotatablely connected with mounting base,
The first end of lockable mechanism is provided with latch hook and stretches out mounting base, and resetting-mechanism coordinates lockable mechanism is promoted to protect with lockable mechanism
It holds in lockup state, electromagnetism unlocking mechanism includes electromagnetism push rod, and electromagnetism push rod is used to that lockable mechanism to be promoted to release lockup state.It should
Lockable mechanism due to being provided with resetting-mechanism, can be maintained at lockup state by electromagnetic unlocking device, the lock on lockable mechanism
Hook can be used for catching on component to be locked, so as to ensure under normal conditions, to treat that locking member is in lockup state, when needing to unlock
When, control electromagnetism unlocking mechanism action, electromagnetism push rod promotes lockable mechanism to overcome the active force of resetting-mechanism, releases locking shape
State, thus, the apparatus structure is simple, and function is reliable.
When above-mentioned electromagnetic unlocking device is applied on ceiling display, mounting base is fixed on to the pedestal of ceiling display
On, and positioned at the distal end of display screen shaft, latch hook is stretched out to be coordinated with the hanging groove set on display screen, and after display screen is packed up, lock
Holding coordinates with hanging groove under the action of being hooked in resetting-mechanism, and display screen is made to be maintained at lockup state, is received so as to eliminate display screen
The reciprocal torque that gravity generates after returning improves the reliability of product.When needing unlock, the unlocking mechanism action of control electromagnetism,
Electromagnetism push rod promotes lockable mechanism to overcome the active force of resetting-mechanism, is separated with hanging groove, so as to release lockup state, thus controls
It is convenient, it is easy to operate.
Description of the drawings
Fig. 1 is a kind of electromagnetic unlocking device schematic diagram provided by the utility model；
Fig. 2 is the explosive view of Fig. 1；
Fig. 3 is a kind of schematic diagram of ceiling display provided by the utility model.
In figure：1 mounting base；11 first mounting holes；12 shaft seats；13 shafts；2 lockable mechanisms；21 latch hooks；22 drive links；
23 motion-stopping surfaces；24 guiding surfaces；3 resetting-mechanisms；31 resetting springs；32 sliding blocks；33 second mounting holes；4 electromagnetism unlocking mechanisms；41
Electromagnetism push rod；10 pedestals；20 display screens；201 hanging grooves.
Specific embodiment
In order to be more clearly understood that the above-mentioned purpose of the utility model, feature and advantage, below in conjunction with the accompanying drawings and have
The utility model is further described in detail in body embodiment.It should be noted that in the case where there is no conflict, this Shen
The feature in embodiment and embodiment please can be mutually combined.
It should be noted that " first " that occurs in the utility model, " second " are only used for distinguishing different structure and component,
Point without priority, the less restriction as structure or component in itself；Meanwhile the "and/or" in the utility model, referring to both can be same
When possess, one of them can also be selected, such as option A and/or option b, including option A, option b, option A and option b this three
Kind situation.
As shown in Figs. 1-2, on the one hand the utility model proposes a kind of electromagnetic unlocking device, including mounting base 1, be arranged on
Lockable mechanism 2, resetting-mechanism 3 and electromagnetism unlocking mechanism 4, lockable mechanism 2 in mounting base 1 are rotatablely connected with mounting base 1, locking
The first end of mechanism 2 is provided with latch hook 21 and stretches out mounting base 1, and resetting-mechanism 3 coordinates to promote lockable mechanism with lockable mechanism 2
2 are maintained at lockup state, and electromagnetism unlocking mechanism 4 includes electromagnetism push rod 41, and electromagnetism push rod 41 is locked for lockable mechanism 2 to be promoted to release
Only state.
Lockable mechanism 2 due to being provided with resetting-mechanism 3, can be maintained at locking shape by above-mentioned electromagnetic unlocking device
State, the latch hook 21 on lockable mechanism 2 can be used for catching on component to be locked, so as to ensure under normal conditions, to treat at locking member
In lockup state, when needing unlock, control electromagnetism unlocking mechanism 4 acts, and electromagnetism push rod 41 promotes lockable mechanism 2 to overcome reset
The active force of mechanism 3 releases lockup state, thus, the apparatus structure is simple, and function is reliable.
When above-mentioned electromagnetic unlocking device is applied on ceiling display, mounting base 1 can be fixed on ceiling display
Pedestal on, and positioned at the distal end of display screen shaft, latch hook 21 is stretched out to be coordinated with the hanging groove that sets on display screen, when display screen is received
After rising, latch hook 21 keeps coordinating with hanging groove under the action of resetting-mechanism 3, display screen is made to be maintained at lockup state, so as to eliminate
The reciprocal torque that gravity generates after display screen is withdrawn improves the reliability of product.When needing unlock, control electromagnetism unlock
Mechanism 4 acts, and electromagnetism push rod 41 promotes lockable mechanism 2 to overcome the active force of resetting-mechanism 3, is separated with hanging groove, so as to release lock
Only state, thus it is easy to control, it is easy to operate.
As long as above-mentioned electromagnetism unlocking mechanism 4, which can be realized, promotes lockable mechanism action, Ke Yishi under electromagnetic action
Electromagnet or other devices comprising electromagnet.
Above-mentioned electromagnetic unlocking device, resetting-mechanism 3 are used to that lockable mechanism 2 to be made to be maintained at lockup state, it is preferable that it is wrapped
Include resetting spring 31（Such as compress spring, extension spring, torsional spring）And it is slideably positioned in the sliding block 32 of mounting base 1, resetting spring
31 one end coordinates against mounting base 1, the other end against sliding block 32, sliding block 32 with lockable mechanism 2.By resetting spring 31 with sliding
The cooperation driving lockable mechanism 2 of block 32 resets, simple in structure, good reliability.
Resetting-mechanism 3 can directly drive lockable mechanism 2 and act, it is preferable that the second end of lockable mechanism 2 is provided with transmission
Bar 22 offers notch on sliding block 32, and drive link 22 is stretched into notch.
Resetting spring 31 and sliding block 32 can be arranged on the internal or external of mounting base 1, it is preferable that mounting base 1 is vertically
It is provided with the first mounting hole 11 of one end closing（That is counterbore）, resetting spring 31 and sliding block 32 be arranged in the first mounting hole 11,
Axially disposed the second mounting hole 33 for thering is one end to close of sliding block 32（That is counterbore）, the both ends of resetting spring 31 are located at first respectively
In 11 and second mounting hole 33 of mounting hole.Resetting spring 31 and sliding block 32 are arranged in the first mounting hole 11 and are conducive to protection again
Position spring 31 and sliding block 32, avoid interference with or fail as early as possible.
Electromagnetism unlocking mechanism 4 can with any suitable position of mounting base, as long as can drive lockable mechanism 2 unlock,
Preferably, electromagnetism unlocking mechanism 4 is fixed in mounting base 1, and positioned at the perforate end of the first mounting hole 11, electromagnetism push rod 41 stretches into
First mounting hole 11 and coordinate with sliding block 32, to pass through sliding block 32 lockable mechanism 2 is promoted to release lockup state.By this programme,
It can leak outside to avoid driving mechanism, rational in infrastructure, reliability is high.
For ease of the installation and connection of lockable mechanism 2, it is preferable that be fixedly installed shaft seat 12, shaft seat in mounting base 1
Shaft 13 is provided on 12, lockable mechanism 2 is sheathed in shaft 13, and lockable mechanism 2 is rotated by shaft 13 and mounting base 1 to be connected
It connects, latch hook 21 stretches out shaft seat 12.Meanwhile mounting base 1 can be cylinder, it is preferred to use for cuboid, the first mounting hole 11
It is circular hole to be preferably with the second mounting hole 33, and convenient for manufacture, opening corresponding with notch is provided on cuboid, consequently facilitating lock
Locking mechanism 2 and the cooperation of sliding block 32 are installed.
Above-mentioned electromagnetic unlocking device, it is preferable that the middle part of lockable mechanism 2 is provided with the shaft hole coordinated with shaft 13,
The middle part of lockable mechanism 2 towards resetting spring 31 one side arc transition, the middle part of lockable mechanism 2 away from resetting spring 31 one
Side is provided with motion-stopping surface 23, and 21 outer end of latch hook is provided with guiding surface 24..By the middle part of lockable mechanism 2 towards resetting spring
31 one side arc transition makes lockable mechanism 2 rotate flexibly, and motion-stopping surface 23 can limit the locking amplitude of lockable mechanism 2, when this
When electromagnetic unlocking device is used for ceiling display, under the guiding of guiding surface 24, make hanging groove automatic Transition in latch hook 21, just
Just locking.
Preferably, the lockable mechanism 2, shaft 13, shaft seat 12, mounting base 1, sliding block 32 are stainless steel.
Above-mentioned electromagnetic locking device, specifically, lockable mechanism 2 are mounted on by shaft 13 in shaft seat 12, are formed hinged
Structure, resetting spring 31 insert after the second mounting hole 33 of 32 end face of sliding block the first mounting hole for inserting 1 side of mounting base together
In 11, pressing sliding block 32 makes resetting spring 31 have certain decrement and makes the notch face mounting base 1 above 32 axis of sliding block
The shaft seat 12 for installing lockable mechanism 2 is fixed by screws in mounting base 1 and makes lockable mechanism 2 by the opening of top
Drive link 22 puts in the notch of sliding block 32, and electromagnetism unlocking mechanism 4 is finally fixed by screws in the side of mounting base 1, electromagnetism
The electromagnetism push rod 41 of unlocking mechanism 4 is withstood on sliding block 32.During applied to ceiling display, electromagnetic unlocking device passes through one group of screw
It is fixed on the pedestal of ceiling display, latch hook 21 stretches out susceptor surface, the hanging groove of display screen is tangled, when display screen needs to open
When, it is powered to electromagnetism unlocking mechanism 4, the electromagnetism push rod 41 of electromagnetism unlocking mechanism 4 pops up and promotes sliding block 32, and sliding block 32 moves together
When stir lockable mechanism 2 drive link 22 make its rotation, lockable mechanism 2 turn an angle after depart from display screen hanging groove, show
Display screen completes unlock, and then, electromagnetism unlocking mechanism 4 powers off, and sliding block 32 promotes lockable mechanism 2 to reply under the effect of resetting spring 31
To original position, for display screen when withdrawing, the hanging groove of display screen acts on the guiding surface of lockable mechanism 2, promotes 2 turns of lockable mechanism
Dynamic, after display screen is withdrawn in place, lockable mechanism 2 is replied under spring force, tangles the hanging groove of display screen, completes locking.
On the other hand, as shown in figure 3, the utility model proposes a kind of ceiling display, including pedestal 10 and display screen
20, any of the above-described kind of electromagnetic unlocking device is further included, mounting base 1 is fixed on pedestal 10, the hanging groove of latch hook 21 and display screen 20
201 cooperations, electromagnetic unlocking device can set one or more, be preferably provided with two.
Due to including above-mentioned electromagnetic unlocking device, mounting base 1 is fixed on the pedestal 10 of ceiling display, and is located at
The distal end of 20 shaft of display screen, the stretching of latch hook 21 coordinates with the hanging groove 201 set on display screen 20, after display screen 20 is packed up,
Latch hook 21 keeps coordinating with hanging groove 201 under the action of resetting-mechanism 3, display screen 20 is made to be maintained at lockup state, so as to eliminate
The reciprocal torque that gravity generates after display screen 20 is withdrawn improves the reliability of product.When needing unlock, Electromagnetic Solution is controlled
Latch mechanism 4 acts, and electromagnetism push rod 41 promotes lockable mechanism 2 to overcome the active force of resetting-mechanism 3, is separated with hanging groove 201, so as to solve
Except lockup state, thus it is easy to control, it is easy to operate.
It these are only the preferred embodiment of the utility model, be not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modifications, equivalent replacements and improvements are made should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of electromagnetic unlocking device, which is characterized in that including mounting base（1）, be arranged on the mounting base（1）On locking machine
Structure（2）, resetting-mechanism（3）And electromagnetism unlocking mechanism（4）, the lockable mechanism（2）With the mounting base（1）Rotation connection, institute
State lockable mechanism（2）First end be provided with latch hook（21）And stretch out the mounting base（1）, the resetting-mechanism（3）With it is described
Lockable mechanism（2）Coordinate to promote the lockable mechanism（2）It is maintained at lockup state, the electromagnetism unlocking mechanism（4）Including electricity
Magnetic push rod（41）, the electromagnetism push rod（41）For promoting the lockable mechanism（2）Release lockup state.
2. electromagnetic unlocking device according to claim 1, which is characterized in that the resetting-mechanism（3）Including resetting spring
（31）And it is slideably positioned in the mounting base（1）Sliding block（32）, the resetting spring（31）One end against the mounting base
（1）, the other end is against the sliding block（32）, the sliding block（32）With the lockable mechanism（2）Cooperation.
3. electromagnetic unlocking device according to claim 2, which is characterized in that the lockable mechanism（2）Second end set
There is drive link（22）, the sliding block（32）On offer notch, the drive link（22）It stretches into the notch.
4. electromagnetic unlocking device according to claim 3, which is characterized in that the mounting base（1）It is axially disposed to have one
The first mounting hole that end seal is closed（11）, the resetting spring（31）And the sliding block（32）It is arranged at first mounting hole（11）
It is interior, the sliding block（32）Axially disposed the second mounting hole for thering is one end to close（33）, the resetting spring（31）Both ends point
It Wei Yu not first mounting hole（11）With the second mounting hole（33）It is interior.
5. electromagnetic unlocking device according to claim 4, which is characterized in that the electromagnetism unlocking mechanism（4）It is fixed on institute
State mounting base（1）On, and positioned at first mounting hole（11）Perforate end, the electromagnetism push rod（41）Stretch into first peace
Fill hole（11）And with the sliding block（32）Cooperation, to pass through the sliding block（32）Promote the lockable mechanism（2）Release locking shape
State.
6. electromagnetic unlocking device according to claim 5, which is characterized in that the mounting base（1）On be fixedly installed turn
Axle bed（12）, the shaft seat（12）On be provided with shaft（13）, the lockable mechanism（2）It is sheathed on the shaft（13）On,
The lockable mechanism（2）Pass through the shaft（13）With the mounting base（1）Rotation connection, the latch hook（21）Stretch out described turn
Axle bed（12）.
7. electromagnetic unlocking device according to claim 6, which is characterized in that the mounting base（1）For cuboid, described
One mounting hole（11）With the second mounting hole（33）For circular hole, opening corresponding with the notch is provided on the cuboid.
8. electromagnetic unlocking device according to claim 6, which is characterized in that the lockable mechanism（2）Middle part be provided with
With the shaft（13）The shaft hole of cooperation, the lockable mechanism（2）Middle part towards the resetting spring（31）One side circle
Arc transition, the lockable mechanism（2）Middle part away from the resetting spring（31）One side be provided with motion-stopping surface（23）.
9. according to claim 1-8 any one of them electromagnetic unlocking devices, which is characterized in that the latch hook（21）Outer end is set
There is guiding surface（24）.
10. a kind of ceiling display, including pedestal（10）And display screen（20）, which is characterized in that it further includes such as claim 1-9
Any one of them electromagnetic unlocking device, the mounting base（1）It is fixed on the pedestal（10）On, the latch hook（21）With it is described
Display screen（20）Hanging groove（201）Cooperation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721564432.0U CN207449797U (en) | 2017-11-21 | 2017-11-21 | A kind of electromagnetic unlocking device and ceiling display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721564432.0U CN207449797U (en) | 2017-11-21 | 2017-11-21 | A kind of electromagnetic unlocking device and ceiling display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207449797U true CN207449797U (en) | 2018-06-05 |
Family
ID=62277597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721564432.0U Expired - Fee Related CN207449797U (en) | 2017-11-21 | 2017-11-21 | A kind of electromagnetic unlocking device and ceiling display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207449797U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109624869A (en) * | 2018-11-22 | 2019-04-16 | 明光泰源安防科技有限公司 | It is a kind of can automatic Display roof display |
| CN110411767A (en) * | 2019-08-20 | 2019-11-05 | 广州铁路职业技术学院（广州铁路机械学校） | A kind of detachable mounting base and metro braking distance test device |
| CN111980498A (en) * | 2019-05-21 | 2020-11-24 | 青岛海尔洗衣机有限公司 | Locking mechanical system and clothing treatment facility |
| CN113611337A (en) * | 2021-06-08 | 2021-11-05 | 哈物实业(上海)有限公司 | Memory fixing device with buffer function |
-
2017
- 2017-11-21 CN CN201721564432.0U patent/CN207449797U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109624869A (en) * | 2018-11-22 | 2019-04-16 | 明光泰源安防科技有限公司 | It is a kind of can automatic Display roof display |
| CN109624869B (en) * | 2018-11-22 | 2021-11-09 | 明光泰源安防科技有限公司 | Car roof display capable of automatically displaying |
| CN111980498A (en) * | 2019-05-21 | 2020-11-24 | 青岛海尔洗衣机有限公司 | Locking mechanical system and clothing treatment facility |
| CN110411767A (en) * | 2019-08-20 | 2019-11-05 | 广州铁路职业技术学院（广州铁路机械学校） | A kind of detachable mounting base and metro braking distance test device |
| CN113611337A (en) * | 2021-06-08 | 2021-11-05 | 哈物实业(上海)有限公司 | Memory fixing device with buffer function |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180605 |
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| CF01 | Termination of patent right due to non-payment of annual fee |