CN207073307U - Telescopic rail component and elevator stage - Google Patents
Telescopic rail component and elevator stage Download PDFInfo
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- CN207073307U CN207073307U CN201721051476.3U CN201721051476U CN207073307U CN 207073307 U CN207073307 U CN 207073307U CN 201721051476 U CN201721051476 U CN 201721051476U CN 207073307 U CN207073307 U CN 207073307U
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- telescopic
- rail component
- telescopic rail
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Abstract
The technical field of stage machinery is the utility model is related to, more particularly, to a kind of telescopic rail component and elevator stage.The telescopic rail component includes：The set rail that more piece is socketed successively；The first connector is provided with the inside of two relative the first side walls of any set rail, the upper end of the first connector is provided with the first stops；The second connector is provided with the outside of two the first side walls of any set rail, the lower end of the second connector is provided with the second stops；Second connector slidable connection of the set rail of the corresponding internal layer of the first connector of the set rail of outer layer, so that the set rail of inner side can move along the short transverse of the set rail of its corresponding outer layer, and the second stops of the set rail for the internal layer that the first stops of the set rail of outer layer can be corresponding coordinates.The telescopic rail component can solve the problem that the guiding stroke of elevator stage is restricted, it is impossible to meet the technical problem of the depth requirements in machine hole.
Description
Technical field
The technical field of stage machinery is the utility model is related to, is waved more particularly, to a kind of telescopic rail component and lifting
Platform.
Background technology
Elevator stage is one of most widely used equipment in stage machinery equipments under stage, professional theatre, dance drama institute,
Threatre, a large amount of various types of elevator stages are all equipped with, even in some threatres based on turntable, cydariform turntable
Inside it is also configured with the elevator stage or elevator of different size.
The depth that elevator stage is cheated according to machine determines the stroke of guide rail, and still, the depth in some machines hole is too deep, existing liter
The stroke for dropping the guiding mechanism of stage is restricted, it is impossible to is met the depth requirements in machine hole, stage is not lifted normally.
Utility model content
First purpose of the present utility model is to provide a kind of telescopic rail component, to alleviate leading for existing elevator stage
To stroke be restricted, it is impossible to meet machine hole depth requirements technical problem.
Telescopic rail component provided by the utility model, including：The set rail that more piece is socketed successively；
The first connector, first connection are provided with the inside of two relative the first side walls of any set rail
The upper end of part is provided with the first stops；The second connector, institute are provided with the outside of two the first side walls of any set rail
The lower end for stating the second connector is provided with the second stops；
Second connector of the set rail of the corresponding internal layer of the first connector of the set rail of outer layer is slidably
Connection, so that the set rail of internal layer can move along the short transverse of the set rail of its corresponding outer layer, and outer layer is described
Cover rail the first stops can be corresponding internal layer the set rail the second stops coordinate.
Further, first connector is T-shaped guide rail, and height side of the T-shaped guide rail along the first side wall
To setting, second connector is the first groove that can be engaged with the T-shaped guide rail.
Further, first recess-mounted is in the first side wall of the set rail.
Further, the first side wall is the first frame structure, and first frame structure includes two vertical guide rods,
Two vertical guide rods are set along the first side wall short transverse, and the gap between two vertical guide rods forms institute
State the first groove.
Further, the T-shaped guide rail includes connected lug boss and pedestal, and the bottom surface of the pedestal is provided with second
Groove, it is corresponding with second groove that first groove penetrates the first side wall；
The lug boss of the set rail of outer layer can pass through the first groove of the set rail of corresponding internal layer and insert institute
State in the second groove.
Further, the second sidewall adjacent with the first side wall is the second frame structure, second frame structure
Including the side plates that are oppositely arranged of short transverse two along the set rail, and the both ends of two side plates respectively with described in two
The first side wall connects.
Further, second frame structure also includes vertical plate and two connecting plates, and two connecting plates intersect
Set, and the both ends of two connecting plates connect one end of two side plates respectively；The both ends of the vertical plate connect vertically
Two side plates are connected on, and the vertical plate contacts with the crosspoint of two connecting plates.
Further, telescopic rail component also includes base, and the bottom that rail is covered described in outermost layer is installed on base.
Compared with prior art, the utility model has the advantage that：
Telescopic rail component provided by the utility model, rail is covered by more piece and is socketed successively, and the set rail of internal layer being capable of edge
The set rail movement of corresponding outer layer, realizes the socket of more piece set rail.Specifically, arbitrarily cover the interior of two the first side walls of rail
Side is provided with the first connector, and its outside is provided with the second connector, and the first connector by the set rail of outer layer is right with it
Second connector of the set rail for the internal layer answered is engaged, and enables the set rail edge set rail short transverse of the set rail opposed outer layer of internal layer
Slide, realize the flexible of set rail, enable telescopic rail component elongated, meet the depth that machine hole requires.And when internal layer
When set rail rises to certain altitude, the second stops that the first stops of the set rail of outer layer keeps out the set rail of internal layer continues to slide, from
And prevent internal layer set rail from continuing to slide, the situation that the second connector departs from the first connector has been avoided the occurrence of, has been improved flexible
The reliability of guide assembly.
In addition, being provided with the first connector on the inside of two the first side walls of set rail, two the first side walls of rail are covered
Outside is provided with the second connector, the set rail of internal layer is socketed in the set rail of outer layer and two side walls connections be present, improves
The stability that the set rail of internal layer set rail opposed outer layer slides.
Second purpose of the present utility model is to provide a kind of elevator stage, to alleviate the guiding of existing elevator stage
Stroke is restricted, it is impossible to meets the technical problem of the depth requirements in machine hole.
Elevator stage provided by the utility model, including：Bottom is cheated, for driving elevator stage face in elevator stage face, machine
The drive device of lifting and described telescopic rail component；
The drive device is arranged between elevator stage face and machine hole bottom；The innermost layer set of the telescopic rail component
The upper end of rail is connected with the elevator stage face, bottom and the machine hole bottom of the outermost layer set rail of the telescopic rail component
Connection.
Further, elevator stage includes drive device described in telescopic rail component described in four groups and four groups；
Telescopic rail component described in four groups forms a distributed rectangular in the lower section in the elevator stage face, and every two groups pairs
The central axis in the telescopic rail component OQ t stage face answered is symmetrical；
Drive device described in four groups is separately positioned on the inner side of telescopic rail component described in four groups, and dress is driven described in four groups
Put to form a rectangle, the central axis in drive device OQ t stage face is symmetrical corresponding to every two groups.
Compared with prior art, the utility model has the advantage that：
Elevator stage provided by the utility model, waved by the upper end of the set rail of the innermost layer of telescopic rail component with lifting
Table top is connected, and the bottom of the outermost set rail of telescopic rail component is connected with machine hole bottom, and the both ends of drive device connect respectively
Connect elevator stage face, machine hole bottom；When drive device offer power, make guide direction of the elevator stage face along telescopic rail component
It is smoothly mobile.Wherein, the structure and beneficial effect of telescopic rail component, it is above-mentioned that detailed elaboration has been carried out, here
No longer repeated.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the stretching, extension for the telescopic rail component that the utility model embodiment one provides；
Fig. 2 is the Local map at the telescopic rail component B that Fig. 1 is provided；
Fig. 3 is the top view for the telescopic rail component that the utility model embodiment one provides；
Fig. 4 is the Local map at the telescopic rail component A that Fig. 3 is provided；
Fig. 5 is the front view for the elevator stage that the utility model embodiment two provides；
Fig. 6 is the top view for the elevator stage that the utility model embodiment two provides.
Icon：100- first set rails；200- the first side walls；300- second sidewalls；400- bases；500- lifting dances
Table top；600- machines cheat bottom；700- drive devices；Second set of rail of 110-；The 3rd set of rail of 120-；The 4th set of rail of 130-；
210-T type guide rails；The grooves of 220- first；The stops of 230- first；The stops of 240- second；211- pedestals；212- lug bosses；
The grooves of 213- second；310- side plates；320- connecting plates；330- vertical plates.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", " vertical ", " interior ",
The orientation or position relationship of instructions such as " outer " are based on orientation shown in the drawings or position relationship, are for only for ease of and describe this reality
With new and simplify description, rather than instruction or imply that signified device or element there must be specific orientation, with specific
Azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " first ", " second ", "
Three ", " the 4th " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
, it is necessary to illustrate in description of the present utility model, unless otherwise clearly defined and limited, term " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in utility model.
Embodiment one
As depicted in figs. 1 and 2, a kind of telescopic rail component that the present embodiment provides, including：The set that more piece is socketed successively
Rail；The internal layer of two relative the first side walls 200 of any set rail is provided with the first connector, and the upper end of the first connector is set
It is equipped with the first stops 230；The outside of two the first side walls 200 of any set rail is provided with the second connector, the second connector
Lower end be provided with the second stops 240；Second connection of the set rail of the corresponding internal layer of the first connector of the set rail of outer layer
Part slidable connection, so that the set rail of inner side can move along the short transverse of the set rail of its corresponding outer layer, and the set rail of outer layer
The first stops 230 can be corresponding the second stops 240 of set rail of internal layer coordinate.
Wherein, telescopic rail component can include two section set rails, three section set rails or four section set rails, in the present embodiment,
By taking four section set rails as an example.Specifically, as depicted in figs. 1 and 2, telescopic rail component include to it is lower and on the first set that is socketed successively
100, second sets of rails 110 of rail, the 3rd set of rail 120 and the 4th set of rail 130, the first connector on first set rail 100 and second set
Second connector slidable connection of rail 110, second set of rail 110 is slided with respect to first set rail 100, realize to first set rail
100 and second set of rail 110 it is flexible, after second set of rail 110 slides into displacement, make the first of first set rail 100 to stop
Block 230 contacts with the second stops 240 of second set of rail 110, the slip for preventing second set of rail 110 from sliding, avoids the occurrence of second set of rail
110 depart from the phenomenon of first set rail 100.Similarly, second set of rail 110 and the 3rd set of rail 120, the 3rd set of rail 120 and the 4th set of rail
130 mechanism is identical with the mechanism of second set of rail 110 with first set rail 100, is not discussed here.
Explanation is needed exist for, two the first stops 230 are arranged on the both sides of the first connector, two the second stops
240 are arranged on the both sides of the second connector, and make the second stops of the first stops 230 of the set rail of outer layer and the set rail of internal layer
240 can interact after the set rail of internal layer moves a certain distance.
In addition, in the present embodiment, as shown in Figure 3 and Figure 4, the first connector is T-shaped guide rail 210, and T-shaped guide rail 210
Set along the short transverse of the first side wall 200, the second connector is the first groove 220 that can be engaged with T-shaped guide rail 210.
It is, the inner side of the first side wall 200 is provided with T-shaped guide rail 210, the outside of the first side wall 200 is provided with the first groove 220,
And the first groove 220 of the T-shaped guide rail 210 of the set rail of outer layer and the set rail of internal layer coordinates, internal layer set rail and outer layer jacket are realized
The slidable connection of rail.The mode more than one that first connector and the second connector coordinate, the change as above-mentioned fit system
Shape, the outside of the first side wall 200 are provided with T-shaped guide rail 210, and the inner side of the first side wall 200 is provided with the first groove 220, and outside
The T-shaped guide rail 210 of the first groove 220 and the set rail of internal layer of the set rail of layer coordinates.
In order to reduce the space shared by telescopic rail component, on the basis of above-described embodiment, further, as shown in figure 4,
First groove 220 is embedded in the first side wall 200 of set rail.It is, the first groove 220 is provided with the first side wall 200,
The set rail of internal layer and the set rail distance in the horizontal direction of outer layer can so reduced, diminution telescopic rail component is in level side
To space, so as to set more piece cover rail.
On the basis of above-described embodiment, further, as shown in figure 4, the first side wall 200 is the first frame structure, first
Frame structure includes two vertical guide rods, and two vertical guide rods are set along the short transverse of the first side wall 200, and two vertical guide rods
Between gap form the first groove 220.It is, T-shaped guide rail 210 slides between two vertical guide rods, by setting the
One side wall 200 is the first frame structure, can mitigate the weight of itself of telescopic rail component, so as to be advantageous to elevator stage
The guiding in face 500 and support.Certainly, the first side wall 200 can also be other structures, for example, the first side wall 200 is flat board knot
Structure.
It is relatively reliable in order to make T-shaped guide rail 210 be connected with the first groove 220, the set rail opposed outer layer of internal layer
The more stable of rail slip is covered, as shown in figure 4, the bottom of T-shaped guide rail 210 is provided with the second groove 213.Specifically, T-shaped guide rail
210 include connected lug boss 212 and pedestal 211, and the second groove 213, the first groove 220 are provided with the bottom surface of pedestal 211
It is corresponding with the second groove 213 to penetrate the first side wall 200；The lug boss 212 of the set rail of outer layer can pass through the set of corresponding internal layer
First groove 220 of rail is simultaneously inserted in the second groove 213.First groove of the lug boss 212 of outer layer jacket rail through internal layer set rail
220 and the second groove 213 is inserted, the contact area of outer layer jacket rail and internal layer set rail can be increased, internal layer is covered rail opposed outer layer
Set rail steadily rises.
In addition, in the present embodiment, as shown in figure 1, the second sidewall 300 adjacent with the first side wall 200 is the second framework
Structure, the second frame structure include two side plates 310 being oppositely arranged along the short transverse for covering rail, and the two of two side plates 310
End is connected with two the first side walls 200 respectively.It is enough into a rectangle mechanism by the first side wall 200 and two side plates 310, can be with
Mitigate the weight of telescopic rail component itself, so as to reduce the power needed during the stretching, extension of telescopic rail component, save the energy,
Second sidewall 300 is used as by the second frame structure and also saves material cost.
In order to improve the strength and stability of telescopic rail component, do not allow it yielding, on the basis of above-described embodiment,
Further, as shown in figure 1, the second frame structure also includes vertical plate 330 and two connecting plates 320, two connecting plates 320 are handed over
Fork is set, and the both ends of two connecting plates 320 connect one end of two side plates 310 respectively；The both ends of vertical plate 330 connect vertically
In two side plates 310, and vertical plate 330 contacts with the crosspoint of two connecting plates 320.Make rectangle by two connecting plates 320
Mechanism forms two stable triangles, does not allow second sidewall 300 yielding, improves the stability of second sidewall 300, together
When by vertical plate 330 can detect more piece cover rail whether align.
In addition, as shown in figure 1, telescopic rail component also includes base 400, the bottom of outermost layer set rail is installed in base
On 400.It is, the bottom of the first set rail 100 shown in Fig. 1, plays a part of stable support telescopic guide assembly.
To sum up, the telescopic rail component that the present embodiment provides, rail is covered by more piece and is socketed successively, and the set rail of internal layer can
Moved along the set rail of corresponding outer layer, realize the socket of more piece set rail.Specifically, arbitrarily cover two the first side walls of rail
200 inner side is provided with the first connector, and its outside is provided with the second connector, passes through the first connector of the set rail of outer layer
Second connector of the set rail of corresponding internal layer is engaged, and enables the set rail of the set rail opposed outer layer of internal layer high along set rail
Spend direction to slide, realize the flexible of set rail, enable telescopic rail component elongated, meet the depth that machine hole requires.And work as
When the set rail of internal layer rises to certain altitude, the first stops 230 of the set rail of outer layer keeps out the second stops 240 of the set rail of internal layer
Continue to slide, so as to prevent internal layer set rail from continuing to slide, avoided the occurrence of the situation that the second connector departs from first connector,
Improve the reliability of telescopic rail component.
In addition, the inner side of two the first side walls 200 of set rail is provided with the first connector, two the first side walls of rail are covered
200 outside is provided with the second connector, the set rail of internal layer is socketed in the set rail of outer layer and two side walls connections be present, carries
The stability that the set rail of high internal layer set rail opposed outer layer slides.
Embodiment two
As shown in figure 5, the elevator stage that the present embodiment provides, including：Elevator stage face 500, machine hole bottom 600, it is used for
Drive the telescopic rail component of the sum of drive device 700 of the lifting of elevator stage face 500；Drive device 700 is arranged on elevator stage
Between face 500 and machine hole bottom 600；The upper end of the innermost layer set rail of telescopic rail component is connected with elevator stage face 500, is stretched
The bottom of the outermost layer set rail of guide assembly is connected with machine hole bottom 600.
The elevator stage that the present embodiment provides, upper end and elevator stage by the set rail of the innermost layer of telescopic rail component
Face 500 is connected, and the bottom of the outermost set rail of telescopic rail component is connected with machine hole bottom 600, the both ends of drive device 700
Elevator stage face 500, machine hole bottom 600 are connected respectively；When drive device 700 provides power, make elevator stage face 500 along flexible
The guide direction of guide assembly smoothly moves.Wherein, the structure and beneficial effect of telescopic rail component, it is above-mentioned to have carried out
Detailed elaboration, is not discussed here.
In order to strengthen stability, on the basis of the present embodiment, further, as shown in Figure 5 and Figure 6, elevator stage includes
Four groups of telescopic rail components and four groups of drive devices 700；Four groups of telescopic rail components form a distributed rectangular in elevator stage
The lower section in face 500, and four groups of drive devices 700 form a rectangle, telescopic rail component OQ t corresponding to every two groups is waved
The central axis of table top 500 is symmetrical；Four groups of drive devices 700 are separately positioned on the inner side of four groups of telescopic rail components, and every two
The central axis in the OQ t stage face 500 of drive device 700 is symmetrical corresponding to group.By forming four groups of telescopic rail components
Rectangle can receive uniform support force to elevator stage face 500 so that elevator stage face 500 can smoothly rise or
Person declines, and improves the reliability of elevator stage.
Explanation is needed exist for, may be sent out to reduce elevator stage face 500 during decline with the set rail of outer layer
Raw collision, the set rail of innermost layer is higher than the set rail of other layers, it is, the 4th set of rail 130 shown in Fig. 1 is higher than other set rails.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
- A kind of 1. telescopic rail component, it is characterised in that including：The set rail that more piece is socketed successively；The first connector is provided with the inside of two relative the first side walls of any set rail, first connector Upper end is provided with the first stops；It is provided with the second connector on the outside of two the first side walls of any set rail, described the The lower end of two connectors is provided with the second stops；Second connector slidable connection of the set rail of the corresponding internal layer of the first connector of the set rail of outer layer, So that the set rail of internal layer can move along the short transverse of the set rail of its corresponding outer layer, and the set rail of outer layer First stops can be corresponding internal layer the set rail the second stops coordinate.
- 2. telescopic rail component according to claim 1, it is characterised in that first connector is T-shaped guide rail, and institute State short transverse of the T-shaped guide rail along the first side wall to set, second connector is that can be engaged with the T-shaped guide rail The first groove.
- 3. telescopic rail component according to claim 2, it is characterised in that first recess-mounted is in the set rail In the first side wall.
- 4. telescopic rail component according to claim 2, it is characterised in that the first side wall is the first frame structure, First frame structure includes two vertical guide rods, and two vertical guide rods are set along the first side wall short transverse, And the gap between two vertical guide rods forms first groove.
- 5. telescopic rail component according to claim 2, it is characterised in that the T-shaped guide rail includes connected lug boss And pedestal, the second groove is provided with the bottom surface of the pedestal, first groove penetrates the first side wall and described second Groove is corresponding；The lug boss of the set rail of outer layer can pass through the first groove of the set rail of corresponding internal layer and insert described the In two grooves.
- 6. according to the telescopic rail component described in claim any one of 1-5, it is characterised in that adjacent with the first side wall Second sidewall be the second frame structure, second frame structure includes two short transverses along the set rail and is oppositely arranged Side plate, and the both ends of two side plates are connected with two the first side walls respectively.
- 7. telescopic rail component according to claim 6, it is characterised in that second frame structure also includes vertical plate With two connecting plates；Two connecting plates are arranged in a crossed manner, and the both ends of two connecting plates connect two sides respectively One end of plate；The both ends of the vertical plate are connected to two side plates, and the friendship of the vertical plate and two connecting plates vertically Crunode contacts.
- 8. according to the telescopic rail component described in claim any one of 1-5, it is characterised in that also including base, outermost layer institute The bottom for stating set rail is installed on base.
- A kind of 9. elevator stage, it is characterised in that including：Bottom is cheated, for driving elevator stage face to lift in elevator stage face, machine Drive device and the telescopic rail component as described in claim any one of 1-8；The drive device is arranged between elevator stage face and machine hole bottom；The innermost layer set rail of the telescopic rail component Upper end is connected with the elevator stage face, and bottom and the machine hole bottom of the outermost layer set rail of the telescopic rail component connect Connect.
- 10. elevator stage according to claim 9, it is characterised in that including telescopic rail component described in four groups and four groups The drive device；Telescopic rail component described in four groups forms a distributed rectangular in the lower section in the elevator stage face, and corresponding to every two groups The central axis in telescopic rail component OQ t stage face is symmetrical；Drive device described in four groups is separately positioned on the inner side of telescopic rail component described in four groups, and drive device shape described in four groups Into a rectangle, the central axis in drive device OQ t stage face is symmetrical corresponding to every two groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721051476.3U CN207073307U (en) | 2017-08-21 | 2017-08-21 | Telescopic rail component and elevator stage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721051476.3U CN207073307U (en) | 2017-08-21 | 2017-08-21 | Telescopic rail component and elevator stage |
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| Publication Number | Publication Date |
|---|---|
| CN207073307U true CN207073307U (en) | 2018-03-06 |
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ID=61520972
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| CN201721051476.3U Active CN207073307U (en) | 2017-08-21 | 2017-08-21 | Telescopic rail component and elevator stage |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465807A (en) * | 2018-10-19 | 2019-03-15 | 上海应用技术大学 | A kind of longitudinal axis structure and robot of truss robot |
| CN112551417A (en) * | 2020-12-18 | 2021-03-26 | 王文龙 | Climbing and loading integrated mechanism |
| CN112739121A (en) * | 2021-01-23 | 2021-04-30 | 六安市科腾帕比信息科技有限公司 | Multi-level electrical cabinet |
| CN113294014A (en) * | 2021-05-28 | 2021-08-24 | 李军 | Telescopic device |
-
2017
- 2017-08-21 CN CN201721051476.3U patent/CN207073307U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465807A (en) * | 2018-10-19 | 2019-03-15 | 上海应用技术大学 | A kind of longitudinal axis structure and robot of truss robot |
| CN112551417A (en) * | 2020-12-18 | 2021-03-26 | 王文龙 | Climbing and loading integrated mechanism |
| CN112739121A (en) * | 2021-01-23 | 2021-04-30 | 六安市科腾帕比信息科技有限公司 | Multi-level electrical cabinet |
| CN113294014A (en) * | 2021-05-28 | 2021-08-24 | 李军 | Telescopic device |
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