CN209143447U - A kind of clearing apparatus of elevator door guide rail - Google Patents
A kind of clearing apparatus of elevator door guide rail Download PDFInfo
- Publication number
- CN209143447U CN209143447U CN201821933411.6U CN201821933411U CN209143447U CN 209143447 U CN209143447 U CN 209143447U CN 201821933411 U CN201821933411 U CN 201821933411U CN 209143447 U CN209143447 U CN 209143447U
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- China
- Prior art keywords
- grasping
- guide rail
- elevator door
- diameter
- clearing apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of clearing apparatus of elevator door guide rail, which is characterized in that the six shaft mechanical arms including being mounted on the car top of elevator, the six shaft mechanicals arm are located at car top close to the side of layer door；The wrist of the six shaft mechanicals arm is equipped with the maintenance tool for maintenance, and the maintenance tool includes motor and is coaxially mounted to sweep disk on the output shaft of motor.The utility model has many advantages, such as that the labor intensity of maintenance staff can be advantageously reduced to the track of elevator door progress automatic cleaning.
Description
Technical field
The utility model relates to elevator reparings to maintain technical field, and the cleaning in particular to a kind of elevator door guide rail fills
It sets.
Background technique
Elevator is a kind of very busy vertical transportation instrument, plays irreplaceable role in modern production life.Electricity
Inevitably there is closing while High-effective Service, in elevator operation people, folder people, crouching bottom in ladder, a series of precipitate ask such as rush to summit
Topic, causes greatly to threaten to the personal safety of passenger.Therefore, elevator maintenance maintenance (abbreviation maintenance) is for elevator safety service
It is a very important thing.
Common elevator accident mainly has door system accident, rushes to summit or crouching bottom accident and other accidents in life, door system
System accident proportion is maximum, accounts for about 80%, followed by rushes to summit or crouching bottom accident, accounts for about 15%, other accidents account for 5%.To protect
Hinder the safety of elevator operation, the daily maintenance period of elevator section components is 15 days primary, including for elevator
The upper hopper chute of door and the rail cleaning of sill slot, guarantee layer door smooth opening and closing.
Currently, above-mentioned maintenance work is mainly completed by manual operation, when carrying out the cleaning of layer door track and door lock, need
It successively shuts down and carries out, large labor intensity, consuming time is long, moreover, elevator travels to and fro between high-rise and ground as high-altitude delivery vehicle
Between, itself has certain risk, and long-time high load operation be easy to cause carelessness, the safety of crisis personnel and equipment,
Considerably increase the cost of artificial maintenance.
Utility model content
In view of the above shortcomings of the prior art, the technical problem to be solved by the utility model is to how to provide a kind of energy
Enough tracks to elevator door carry out automatic cleaning, advantageously reduce the clear of the elevator door guide rail of the labor intensity of maintenance staff
Sweeping device.
In order to solve the above-mentioned technical problem, the utility model uses the following technical solution:
A kind of clearing apparatus of elevator door guide rail, which is characterized in that six axis including being mounted on the car top of elevator
Mechanical arm, the six shaft mechanicals arm are located at car top close to the side of layer door；The wrist installation of the six shaft mechanicals arm is useful
In the maintenance tool of maintenance, the maintenance tool includes motor and is coaxially mounted to sweep disk on the output shaft of motor.
It further, further include outer barrel, the motor is mounted in the outer barrel, and the output shaft of the motor stretches out
The outer barrel, and be equipped with and described sweep disk；Purging flabellum, the purging flabellum position are additionally provided on the output shaft of the motor
In in the outer barrel, and tactical diameter is consistent with the internal diameter of the outer barrel, and the outer barrel is close to the position of the motor
On be provided with air inlet, the outer barrel is swept described in and is provided with inflatable mouth on the end face of disk.
Further, the wrist of the six shaft mechanicals arm also has the grasping mechanism for grasping the maintenance tool, institute
The grasping part having on maintenance tool convenient for the corresponding grasping of the grasping mechanism is stated, the maintenance tool is detachable to be grasped in institute with putting
It states on grasping mechanism.
Further, the grasping part of the maintenance tool is integrally cylindrical, and one end of the grasping part, which has, coaxially to be set
The grip hole set；The grasping mechanism includes tubular grasping frame on the wrist for be mounted on the six shaft mechanicals arm, described to grab
The diameter for holding frame is less than the diameter of the grip hole；Also there are multiple clamping portions for being evenly distributed setting on the grasping frame,
And for driving the clamping portion radially driving mechanism outstanding, the clamping portion is enable to be connected to the grasping
In hole.
Further, there is the through-hole for being evenly distributed setting on the grasping frame, the wedging position is in the through-hole
Place, and be provided projectingly inwardly；The driving mechanism includes the electromagnetism push rod being co-axially located in the grasping frame, and coaxial peace
Tensioner column on the electromagnetism push rod, the diameter of the tensioner column are greater than the inscribed circle diameter of multiple clamping portions, institute
The outer end for stating tensioner column is the tightening part of truncated cone-shaped, and the minimum diameter of the tightening part is less than the inscribed circle of multiple clamping portions
Diameter；When the electromagnetism push rod stretches, the tightening part can integrally pass through the clamping portion position.
Further, the grasping frame is to be had by U-shaped on the side wall of the cylinder using cylinder made of stainless steel
Grooving cutting made of bar shaped elastic slice, axial setting of the bar shaped elastic slice along the grasping frame；The bar shaped elastic slice hangs
It sets end and is bent to form the clamping portion inwardly.
Further, the suspension end of the bar shaped elastic slice, which is arc-shaped, bends inwards, and forms U-shaped structure.
Further, have in the grip hole and be correspondingly arranged annular slot with the clamping portion, make the clamping portion edge
After projecting radially outwardly, it is located in the annular slot.
Further, the bottom of the grip hole is provided with the first plug connector of connection power supply；The outer end of the tensioner column
Portion has the second plug connector being correspondingly arranged with first plug connector.
Further, first plug connector includes the circular groove for being co-axially located at the grip hole bottom, the circle
The bottom of connected in star has the annular ridge of multiple coaxial arrangements, and the end face of each annular ridge is equipped with conductive contact；
Second plug connector includes the round boss for being co-axially located at the tensioner column, the diameter of the round boss and the circle
The diameter of groove is consistent；The annular grooves being correspondingly arranged on the end face of the round boss with the multiple and annular ridge,
The depth of the annular groove is less than the height of the annular ridge, and bottom is equipped with conductive contact.
In conclusion the utility model, which has, to carry out automatic cleaning to the track of elevator door, dimension is advantageously reduced
The advantages that labor intensity of guarantor person.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of elevator intelligent maintenance device.
Fig. 2 is the structural schematic diagram of cleaning device.
Fig. 3 is the end structure illustration of the first plug connector in Fig. 2.
Fig. 4 is the structural schematic diagram of grasping mechanism.
Fig. 5 is the end structure illustration of the second plug connector in Fig. 4.
Fig. 6 is the structural schematic diagram of parcel shelf.
Fig. 7 is the structural schematic diagram of spring leaf.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
When specific implementation: as shown in Figure 1, a kind of elevator intelligent maintenance system, including maintenance device and described for controlling
The control system of maintenance device progress maintenance work；The maintenance device includes six shaft mechanicals for being mounted on the car top of elevator
Arm 1, the six shaft mechanicals arm 1 can extend to elevator door and track region；The wrist of the six shaft mechanicals arm 1 is installed
There is the maintenance tool 2 for maintenance.
Using the above structure, tool is maintained using the replacement manual operation of six shaft mechanical arms, example is carried out to elevator components
Row maintenance work, can complete in maintenance largely to repeat and dull work, advantageously reduce the labor intensity of maintenance staff, keep away
Exempt from maintenance staff and occur the safety that carelessness jeopardizes personnel and equipment because working long hours, can be improved safety and work effect
Rate can also greatly shorten maintenance staff in the working time of car top, reduce the security risk and artificial dimension of maintenance staff
Guaranteed cost.
When implementation, the maintenance device further includes the track 3 for being mounted on car top in a ring, and the track 3 is close to sedan-chair
The edge in compartment is arranged；The pedestal of the six shaft mechanicals arm 1 is movably mounted on the track 3, the pedestal and the rail
The automatically controlled driving wheel for driving the six shaft mechanicals arm 1 to move along the guide rail 3 is additionally provided between road 3.
By the track being arranged in a ring close to carriage edge, six shaft mechanical arms can be made to be moved in elevator along track
Any position of wall.In this way, extending to elevator door and rail with also can be convenient even if opening up lesser six shaft mechanicals arm using arm
Road region carries out maintenance to elevator components.Advantageously reduce the cost of six shaft mechanical arms.
When implementation, the wrist of the six shaft mechanicals arm 1 also has the grasping mechanism 4 for grasping the maintenance tool 2, institute
The grasping part 21 having on maintenance tool 2 convenient for the corresponding grasping of the grasping mechanism 4 is stated, the maintenance tool 2 can grab with discharging
It holds on the grasping mechanism 4；The maintenance device further includes the supporter 5 for placing the maintenance tool 2.
Since the maintenance project of elevator components is different, used maintenance tool is not also identical, using the above structure, can
The maintenance tool of disparity items to be placed on supporter, six shaft mechanical arms can need to go grasping corresponding according to maintenance project
Maintenance tool carry out maintenance operation.
When implementation, as shown in Fig. 2, the grasping part 21 of the maintenance tool 2 is whole cylindrical, in the grasping part 21
Portion has radially projecting boss 22；As shown in fig. 6, on the supporter 5 include horizontally disposed parcel shelf 51, it is described to set
On object plate 51 have with the consistent glove hole 52 of 21 diameter of grasping part, the grasping part 21 is vertically placed on the glove hole
In 52.
Since boss is located at the middle part of grasping part, and it is provided projectingly, and the diameter of glove hole is consistent with the diameter of grasping part,
When so that grasping part being vertically placed in glove hole, it can be placed on parcel shelf using boss stabilization.And above-mentioned supporter
Structure is simple, light-weight, is easily installed in car top.
There is the notch to the 51 width direction side of parcel shelf perforation setting, institute when implementation, on the glove hole 52
The width for stating notch is consistent with the diameter of the glove hole 52.
In this way, grasping part can be removed and placed into from glove hole by the notch, operate more flexible.
When implementation, circumferential direction of the boss 22 along the grasping part 21 is arranged in a ring；The two sides of the notch have edge
The limiting slot 53 of the width direction setting of the parcel shelf 51, the width of the limiting slot 53 are greater than the thickness of the boss 22,
The bottom spacing of the limiting slot 53 of two sides is greater than the diameter of the boss 22.
In this way, the boss on grasping part can be put into the limiting slot of notch two sides by notch side, so that elevator is upper
In lower operational process, grasping part is not easy to fall out of glove hole, the stability of maintenance tool not only can be improved, but also can be to avoid work
Tool falls and causes elevator faults.
When implementation, also there is the elastic spacing card 54 being provided projectingly in the limiting slot 53, the boss 22 is enable to exist
The elastic spacing card 54 is squeezed under external force passes in and out the notch.
The cooperation for passing through elastic spacing card and limiting slot in this way, the grasping part being placed on parcel shelf can be limited in and be set
In object hole, even if maintenance tool runs with elevator and generates shake, maintenance tool will not all fallen, improve stability and safety
Property.
When implementation, the elastic spacing card 54 is located at the bottom of the limiting slot 53.
Since boss is annular, when passing in and out notch, lateral surface and limit trench bottom are angled, can lack disengaging
The power in mouthful direction decomposes on elastic spacing card, it is easier to extruding is generated to limiting card so that maintenance tool take it is more convenient.
When implementation, the elastic spacing card 54 is the spring leaf being arranged along 51 width direction of parcel shelf, the spring
The both ends of piece are bonded with the inner wall of the limiting slot 53, and the arc-shaped protrusion in middle part forms limiting section.
In this way, can use the guiding role of protrusion arc-shaped in the middle part of spring leaf when boss passes in and out notch, it is easier to squeeze
Press protrusion.
When implementation, one end of the spring leaf is fixedly mounted on the limiting slot 53, and the other end is along the parcel shelf 51
Width direction be slidably attached in the limiting slot 53.
Since one end of spring leaf is movable, so that the movable end of spring leaf can be along limit when boss extruding spring leaf
Position slot sliding, the compression of spring leaf are more easier.
When implementation, there are two the settings of elastic spacing card 54, is located at the limiting slot 53 of the notch two sides
It is interior.
When implementation, the spring leaf is made of stainless steel.
When implementation, one end of the grasping part 21 has the grip hole 23 of coaxial arrangement；As shown in figure 4, the grasping machine
Structure 4 includes being mounted on tubular grasping frame 41 on the wrist of the six shaft mechanicals arm 1, and the diameter of the grasping frame 41 is less than institute
State the diameter of grip hole 23；Also there are multiple clamping portions 42 for being evenly distributed setting, and for driving on the grasping frame 41
The clamping portion 42 radially driving mechanism 43 outstanding is moved, the clamping portion 42 is enable to be connected to the grip hole 23
It is interior.
In this way, allowing the grasping frame of grasping mechanism to be inserted into grip hole, then lead to by the way that grip hole is arranged on grasping part
Mechanism of overdriving ejects clamping portion outward, will maintain tool using the clamping of clamping portion and grip hole and grasp in grasping mechanism
On.Compared to traditional manipulator, crawl is carried out inside grip hole can more save space, can reduce two neighboring guarantor
The placement distance for the tool of supporting in the small space in elevator, can either reserve enough operating spaces, and energy to mechanical arm
It is enough to place more maintenance tools, complete more maintenance projects.
When implementation, there is the through-hole for being evenly distributed setting on the grasping frame 41, the clamping portion 42 is located at described logical
At hole, and it is provided projectingly inwardly；The driving mechanism 43 includes the electromagnetism push rod 431 being co-axially located in the grasping frame 41,
And it is coaxially mounted to the tensioner column 432 on the electromagnetism push rod 431, the diameter of the tensioner column 432 is greater than multiple cards
The inscribed circle diameter of socket part 42, the outer end of the tensioner column 432 are the tightening part of truncated cone-shaped, and the minimum diameter of the tightening part is small
Inscribed circle diameter in multiple clamping portions 42；When the electromagnetism push rod 431 stretches, the tightening part can integrally pass through institute
State 42 position of clamping portion.
In this way, tightening part is by clamping portion, since the maximum gauge of tightening part is greater than multiple clampings when electromagnetism push rod stretches out
The inscribed circle diameter in portion so that clamping portion is under the guiding role of tightening part ramp, outwardly against, and it is radially projecting can
To be connected in grip hole.When electromagnetism push rod is shunk, tightening part is reverses through clamping portion, since the minimum diameter of tightening part is less than
The inscribed circle diameter of multiple clamping portions, so that the extruding force acted on clamping portion disappears, grasping frame can be out of grip hole
Smoothly exit.
When implementation, the grasping frame 41 is to be had by U-shaped on the side wall of the cylinder using cylinder made of stainless steel
Grooving cutting made of bar shaped elastic slice, axial setting of the bar shaped elastic slice along the grasping frame 41；The bar shaped elastic slice
Suspension end is bent to form the clamping portion 42 inwardly.
In this way, being directly cut into bar shaped elastic slice using stainless steel cylinder, and it is bent into clamping portion, so that the two is always one
Body structure, it is simple and stable, convenient for assembly.It, can be after the contraction of electromagnetism push rod certainly and using the elastic force of bar shaped elastic slice itself
It is dynamic to reset, clamped condition is released, is smoothly exited out of grip hole convenient for grasping frame.
When implementation, the suspension end of the bar shaped elastic slice, which is arc-shaped, to bend inwards, and forms U-shaped structure.
It is bent inwardly to U-shaped structure since bar shaped elastic slice is arc-shaped, both can reduce the frictional force between tightening part,
It is smoothly stretched out convenient for electromagnetism push rod, it is also possible that clamping portion has elastic deformability in grasping frame in the radial direction,
Elastic extruding is remained when clamping, improves the stability of grasping.
When implementation, has in the grip hole 23 and be correspondingly arranged annular slot with the clamping portion 42, make the clamping portion
After 42 radially protrude, it is located in the annular slot.
It falls off, mentions from grasping mechanism in this way, can use maintenance tool during annular slot further places grasping
The stability of height grasping.
When implementation, the maintenance tool 2 is electric tool, and the bottom of the grip hole 23 is provided with the first of connection power supply
Plug connector 24；The outer end of the tensioner column 432 has the second plug connector 433 being correspondingly arranged with first plug connector.
When implementation, as shown in Figure 3 and Figure 5, first plug connector 24 includes being co-axially located at 23 bottom of grip hole
Circular groove, the bottom of the circular groove has the annular ridge of multiple coaxial arrangements, the end of each annular ridge
Face is equipped with conductive contact；Second plug connector 433 includes the round boss for being co-axially located at the tensioner column 432, described
The diameter of round boss is consistent with the diameter of the circular groove；There is the multiple and annular on the end face of the round boss
The annular groove that fin is correspondingly arranged, the depth of the annular groove is less than the height of the annular ridge, and bottom is equipped with and leads
Electric contact.
In this way, no matter grasping mechanism uses what kind of posture grasping maintenance tool, it can guarantee the second plug connector and the
The alignment connection of one plug connector.
When implementation, the maintenance tool 2 is milling tools for elevator landing door lock of polishing, including motor and is mounted on
Grinding head on the output shaft of motor, the grinding head are steel wire grinding head.
When implementation, the maintenance tool 2 is the cleaning device for cleaning elevator door guide rail, including motor and coaxial peace
Disk is swept on the output shaft of motor.
When implementation, as shown in Fig. 2, the cleaning device further includes outer barrel, the motor is mounted in the outer barrel,
The output shaft of the motor stretches out the outer barrel, and is equipped with and described sweeps disk；It is additionally provided with and blows on the output shaft of the motor
Flabellum is swept, the purging flabellum is located in the outer barrel, and tactical diameter is consistent with the internal diameter of the outer barrel, the outer cylinder
Body is provided with air inlet on the position of the motor, sweeps described in the outer barrel direction and is provided with air blowing on the end face of disk
Mouthful.
In this way, can also be purged simultaneously when carrying out the cleaning of layer door guide rail, so that cleaning is more thorough.
The above is only the preferred embodiment of the utility model only, is not limitation with the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of clearing apparatus of elevator door guide rail, which is characterized in that the six axis machines including being mounted on the car top of elevator
Tool arm (1), the six shaft mechanicals arm are located at car top close to the side of layer door；The wrist of the six shaft mechanicals arm (1) is installed
There is the maintenance tool (2) for maintenance, the maintenance tool (2) includes motor and is coaxially mounted to sweeping on the output shaft of motor
Disk.
2. the clearing apparatus of elevator door guide rail as described in claim 1, which is characterized in that it further include outer barrel, the electricity
Machine is mounted in the outer barrel, and the output shaft of the motor stretches out the outer barrel, and is equipped with and described is swept disk；The motor
Output shaft on be additionally provided with purging flabellum, the purging flabellum is located in the outer barrel, and tactical diameter and the outer cylinder
The internal diameter of body is consistent, and the outer barrel is provided with air inlet on the position of the motor, and the outer barrel is swept described in
Inflatable mouth is provided on the end face of disk.
3. the clearing apparatus of elevator door guide rail as described in claim 1, which is characterized in that the six shaft mechanicals arm (1)
Wrist also has the grasping mechanism (4) for grasping the maintenance tool (2), has on the maintenance tool (2) convenient for described
The grasping part (21) of the corresponding grasping of grasping mechanism (4), the maintenance tool (2) can grasp in the grasping mechanism (4) with discharging
On.
4. the clearing apparatus of elevator door guide rail as claimed in claim 3, which is characterized in that maintenance tool (2) are grabbed
It is whole cylindrical to hold portion (21), one end of the grasping part (21) has the grip hole (23) of coaxial arrangement；The grasping machine
Structure (4) includes being mounted on tubular grasping frame (41) on the wrist of the six shaft mechanicals arm (1), described to grasp the straight of frame (41)
Diameter is less than the diameter of the grip hole (23)；Also there are multiple clamping portions for being evenly distributed setting on the grasping frame (41)
(42), and for driving the clamping portion (42) radially driving mechanism (43) outstanding, make the clamping portion (42)
It can be connected in the grip hole (23).
5. the clearing apparatus of elevator door guide rail as claimed in claim 4, which is characterized in that have on the grasping frame (41)
It is evenly distributed the through-hole of setting, the clamping portion (42) is located at the through hole, and is provided projectingly inwardly；The driving mechanism
(43) include the electromagnetism push rod (431) being co-axially located in grasping frame (41), and be coaxially mounted to the electromagnetism push rod
(431) the tensioner column (432) on, the diameter of the tensioner column (432) are greater than the inscribed circle diameter of multiple clamping portions (42),
The outer end of the tensioner column (432) is the tightening part of truncated cone-shaped, and the minimum diameter of the tightening part is less than multiple clamping portions
(42) inscribed circle diameter；When the electromagnetism push rod (431) is stretched, the tightening part integrally can pass through the clamping portion (42)
Position.
6. the clearing apparatus of elevator door guide rail as claimed in claim 5, which is characterized in that the grasping frame (41) is to use
Cylinder made of stainless steel has the bar shaped elastic slice as made of U-shaped grooving cutting, the bar shaped on the side wall of the cylinder
Axial setting of the elastic slice along grasping frame (41)；The suspension end of the bar shaped elastic slice is bent to form the clamping portion inwardly
(42)。
7. the clearing apparatus of elevator door guide rail as claimed in claim 6, which is characterized in that the suspension end of the bar shaped elastic slice
It is arc-shaped and bends inwards, and form U-shaped structure.
8. the clearing apparatus of elevator door guide rail as claimed in claim 6, which is characterized in that have in the grip hole (23)
It is correspondingly arranged annular slot with the clamping portion (42), after protruding the clamping portion (42) radially, is located at the ring
In shape card slot.
9. the clearing apparatus of elevator door guide rail as claimed in claim 5, which is characterized in that the bottom of the grip hole (23)
It is provided with the first plug connector (24) of connection power supply；The outer end of the tensioner column (432) has and first plug connector pair
The second plug connector (433) that should be arranged.
10. the clearing apparatus of elevator door guide rail as claimed in claim 9, which is characterized in that first plug connector (24)
The bottom of circular groove including being co-axially located at the grip hole (23) bottom, the circular groove has multiple coaxial arrangements
Annular ridge, the end face of each annular ridge is equipped with conductive contact；Second plug connector (433) includes coaxially setting
The round boss in the tensioner column (432) is set, the diameter of the round boss is consistent with the diameter of the circular groove；It is described
The annular grooves being correspondingly arranged on the end face of round boss with the multiple and annular ridge, the depth of the annular groove are small
In the height of the annular ridge, and bottom is equipped with conductive contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821933411.6U CN209143447U (en) | 2018-11-22 | 2018-11-22 | A kind of clearing apparatus of elevator door guide rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821933411.6U CN209143447U (en) | 2018-11-22 | 2018-11-22 | A kind of clearing apparatus of elevator door guide rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209143447U true CN209143447U (en) | 2019-07-23 |
Family
ID=67286855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821933411.6U Expired - Fee Related CN209143447U (en) | 2018-11-22 | 2018-11-22 | A kind of clearing apparatus of elevator door guide rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209143447U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7185859B1 (en) * | 2021-10-14 | 2022-12-08 | フジテック株式会社 | elevator inspection aid |
-
2018
- 2018-11-22 CN CN201821933411.6U patent/CN209143447U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7185859B1 (en) * | 2021-10-14 | 2022-12-08 | フジテック株式会社 | elevator inspection aid |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190723 Termination date: 20201122 |