CN214336133U - Good portable building model display device of stability - Google Patents
Good portable building model display device of stability Download PDFInfo
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- CN214336133U CN214336133U CN202022700977.8U CN202022700977U CN214336133U CN 214336133 U CN214336133 U CN 214336133U CN 202022700977 U CN202022700977 U CN 202022700977U CN 214336133 U CN214336133 U CN 214336133U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000013016 damping Methods 0.000 claims description 21
- 238000009434 installation Methods 0.000 claims description 18
- 230000007704 transition Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
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Abstract
The utility model discloses a mobile building model display device with good stability, which comprises a base, a plurality of mobile rollers and a display platform assembly arranged on the base, wherein a stable supporting assembly is arranged in the base, and the stable supporting assembly comprises a stable supporting unit and a power unit for driving the stable supporting unit to vertically move; the stable supporting unit comprises an elastic steel plate and an anti-skid elastic cushion; the power unit comprises a double-shaft motor and a mounting positioning plate; the utility model is provided with the elastic steel plate, the double-shaft motor and the plurality of movable rollers, when the whole device needs to be moved, the movable rollers are used as the supporting surface of the whole device; when the integrated device needs to be stood for display, the double-shaft motor rotates, and under the combined action of the triangular guide driving block, the guide driving rod and the reset spring, the anti-skid elastic cushion is used as a contact surface between the integrated device and the ground, so that the stability of the integrated device on the ground is guaranteed and better improved.
Description
Technical Field
The utility model relates to a building field specifically is a portable building model display device that stability is good.
Background
Present architectural model display device is directly placed subaerial usually, has then that the phenomenon of whole device transport is not convenient to exist, if add simple and easy removal gyro wheel in whole device's bottom, has the whole device again and place the not enough problem of stability when the show of stewing, based on this, we provide a good portable architectural model display device of stability for solving above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a portable model for building display device that stability is good to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a mobile building model display device with good stability comprises a base, a plurality of mobile rollers and a display platform assembly arranged on the base, wherein the base is hollowed out and is provided with an opening at the bottom;
the stable supporting unit comprises elastic steel plates which are symmetrically arranged and anti-skidding elastic cushions which are fixedly arranged at the bottoms of the elastic steel plates, the elastic steel plates are arranged on the power unit, a plurality of damping units are uniformly distributed among the elastic steel plates which are symmetrically arranged, a plurality of T-shaped sliding groove groups which are in one-to-one correspondence with the damping units are arranged on the corresponding surfaces of the elastic steel plates which are symmetrically arranged, each T-shaped sliding groove group comprises an upper T-shaped sliding groove and a lower T-shaped sliding groove, each damping unit comprises an upper T-shaped sliding block which is slidably arranged in the upper T-shaped sliding groove and a lower T-shaped sliding block which is slidably arranged in the lower T-shaped sliding groove, the upper T-shaped sliding blocks are symmetrically arranged, the lower T-shaped sliding blocks are symmetrically arranged, a first connecting rod and a second connecting rod which are hinged with each other are arranged between the upper T-shaped sliding block and the lower T-shaped sliding block, and the end parts of the first connecting rod and the second connecting rod are respectively rotatably arranged on the upper T-shaped sliding block and the lower T-shaped sliding block, the upper T-shaped sliding block and the lower T-shaped sliding block are respectively connected with a pressure spring between adjacent side walls of the upper T-shaped sliding chute and the lower T-shaped sliding chute, damping rubber strips are symmetrically arranged on two side surfaces of the first connecting rod and the second connecting rod which are mutually hinged, and the damping rubber strips are fixedly arranged between the elastic steel plates which are symmetrically arranged;
the power unit comprises a double-shaft motor fixedly arranged on the inner wall of the top of the base and an installation positioning plate slidably arranged in the chute, a rotary screw rod is fixedly arranged at the output end of the double-shaft motor, the rotary screw rod is rotatably arranged on the base, driving sliders matched with the rotary screw rod are arranged on the rotary screw rod respectively, the driving sliders are slidably arranged in the second chute, guide driving rods are fixed at the bottoms of the driving sliders respectively, the bottom surfaces of the guide driving rods are arranged in an inclined plane, triangular guide driving blocks corresponding to the guide driving rods in a one-to-one mode are fixedly arranged on the upper surface of the installation positioning plate, the inclined planes of the triangular guide driving blocks are matched with the inclined planes of the guide driving rods, a reset spring is connected between the installation positioning plate and the lower bottom wall of the chute, a transition supporting block is fixedly arranged at the bottom of the installation positioning plate, and an elastic steel plate is fixedly arranged on the transition supporting block, when the mounting positioning plate is positioned at the upper limit position of the sliding groove, the lowest surface of the anti-skidding elastic pad is higher than the lowest surface of the movable roller.
As a further aspect of the present invention: the show stand subassembly is including setting up the fixed frame of U type show and show place the platform on the base, show place a fixed mounting in the bottom inner wall of the fixed frame of U type show, show place the platform's upper surface is embedded to have the magnetic adsorption board that adsorbs each other with the architectural model.
As a further aspect of the present invention: a height adjusting component is arranged between the base and the U-shaped display fixing frame, the height adjusting component comprises a height adjusting frame fixedly arranged on the base and a height adjusting motor fixedly arranged on the inner wall of the bottom of the height adjusting frame, the inner wall of the side surface of the height adjusting frame is symmetrically provided with third sliding grooves, the top of the height adjusting frame is provided with avoidance grooves, second rotating screw rods are symmetrically arranged on two sides of the height adjusting motor and are rotatably arranged on the height adjusting frame, the second rotating screw rod is in transmission connection with the height adjusting motor through a belt pair, the second rotating screw rod is provided with an installation support plate which is matched with the second rotating screw rod, the mounting support plate is slidably mounted in the third sliding groove, an I-shaped positioning block penetrating through the avoiding groove is fixedly mounted on the mounting support plate, and the U-shaped display fixing frame is fixedly mounted on the I-shaped positioning block.
As a further aspect of the present invention: the external diameter of show place the platform is less than the internal diameter of the fixed frame of U type show, be provided with the protection component between the fixed frame of U type show and the show place the platform, T type spout has been seted up to show place the platform's lateral wall, the protection component is including having the guard ring of damping slidable mounting in T type spout.
As a further aspect of the present invention: towards T type spout the guard ring lateral wall fixed mounting T type slider, T type slider has damped slidable mounting in T type spout.
Compared with the prior art, the beneficial effects of the utility model are that:
by arranging the elastic steel plate, the double-shaft motor and the plurality of movable rollers which are symmetrically arranged, when the integral device needs to move, the mounting positioning plate is positioned at the upper limit position of the sliding groove, and the movable rollers are used as the supporting surfaces of the integral device, so that the integral device can move conveniently; when the integrated device needs to be stood for display, the double-shaft motor rotates, under the combined action of the triangular guide driving block, the guide driving rod and the reset spring, the drive installation positioning plate moves downwards along the sliding groove, then the anti-skid elastic cushion is driven to touch the ground, the anti-skid elastic cushion is taken as a contact surface between the integrated device and the ground, meanwhile, the integrated device is placed on the ground under the combined action of the first connecting rod and the second connecting rod which are hinged to each other, the elastic steel plate and the pressure spring, and therefore the stability of the integrated device is guaranteed and better improved.
Drawings
Fig. 1 is a schematic structural diagram of a mobile building model display device with good stability.
Fig. 2 is a schematic structural diagram of a position a of the mobile building model display device with good stability.
Fig. 3 is a schematic structural diagram of a mobile building model display device with good stability at a position B.
Fig. 4 is a schematic structural diagram of a mobile construction model display device with good stability at the position C.
In the figure: 1-base, 2-mobile roller, 3-hollow support plate, 4-chute, 5-elastic steel plate, 6-antiskid elastic cushion, 7-upper T-shaped chute, 8-lower T-shaped chute, 9-upper T-shaped slide block, 10-lower T-shaped slide block, 11-first connecting rod, 12-second connecting rod, 13-damping rubber strip, 14-pressure spring, 15-second chute, 16-double-shaft motor, 17-installation positioning plate, 18-rotating screw rod, 19-driving slide block, 20-guiding driving rod, 21-triangular guiding driving block, 22-reset spring, 23-U-shaped display fixing frame, 24-display placing table, 25-magnetic adsorption plate, 26-transition support block, 27-height adjusting frame, 28-height adjusting motor, 29-avoidance groove, 30-second rotating screw rod, 31-third chute, 32-belt pair, 33-mounting support plate, 34-I-shaped positioning block, 35-T-shaped chute, 36-protection ring, 37-T-shaped slide block and 100-building model.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
Referring to fig. 1-4, a mobile building model display device with good stability comprises a base 1, a plurality of mobile rollers 2 and a display platform assembly arranged on the base 1, wherein the base 1 is hollowed out and provided with an open bottom, a hollowed support plate 3 is fixedly installed at the bottom of the base 1, the mobile rollers 2 are uniformly distributed at the bottom of the hollowed support plate 3, a stable support assembly is arranged in the base 1, sliding grooves 4 are symmetrically formed in the inner wall of the side surface of the base 1, second sliding grooves 15 are symmetrically formed in the inner wall of the top of the base 1, and the stable support assembly comprises a stable support unit and a power unit for driving the stable support unit to vertically move;
the stable supporting unit comprises elastic steel plates 5 which are symmetrically arranged and anti-skid elastic cushions 6 which are fixedly arranged at the bottoms of the elastic steel plates 5, the elastic steel plates 5 are arranged on the power unit, a plurality of damping units are uniformly distributed among the elastic steel plates 5 which are symmetrically arranged, a plurality of T-shaped sliding groove groups which are in one-to-one correspondence with the damping units are arranged on the corresponding surfaces of the elastic steel plates 5 which are symmetrically arranged, each T-shaped sliding groove group comprises an upper T-shaped sliding groove 7 and a lower T-shaped sliding groove 8, each damping unit comprises an upper T-shaped sliding block 9 which is slidably arranged in the upper T-shaped sliding groove 7 and a lower T-shaped sliding block 10 which is slidably arranged in the lower T-shaped sliding groove 8, the upper T-shaped sliding blocks 9 are symmetrically arranged, the lower T-shaped sliding blocks 10 are symmetrically arranged, and a first connecting rod 11 and a second connecting rod 12 which are hinged with each other are arranged between the upper T-shaped sliding block 9 and the lower T-shaped sliding block 10 which are symmetrically arranged, the end parts of the first connecting rod 11 and the second connecting rod 12 are respectively rotatably mounted on an upper T-shaped sliding block 9 and a lower T-shaped sliding block 10, the upper T-shaped sliding block 9 and the lower T-shaped sliding block 10 are respectively connected with a pressure spring 14 between adjacent side walls of an upper T-shaped sliding chute 7 and a lower T-shaped sliding chute 8, two side surfaces of the first connecting rod 11 and the second connecting rod 12 which are mutually hinged are symmetrically provided with damping rubber strips 13, and the damping rubber strips 13 are fixedly mounted between the symmetrically arranged elastic steel plates 5;
the power unit comprises a double-shaft motor 16 fixedly installed on the inner wall of the top of the base 1 and an installation positioning plate 17 slidably installed in the chute 4, a rotating screw rod 18 is fixedly installed at the output end of the double-shaft motor 16, the rotating screw rod 18 is rotatably installed on the base 1, driving sliders 19 matched with the rotating screw rod 18 are arranged on the rotating screw rod 18, the driving sliders 19 are slidably installed on the second chute 15, guide driving rods 20 are fixed at the bottoms of the driving sliders 19, the bottom surface of each guide driving rod 20 is an inclined surface, triangular guide driving blocks 21 corresponding to the guide driving rods 20 in a one-to-one manner are fixedly installed on the upper surface of the installation positioning plate 17, the inclined surfaces of the triangular guide driving blocks 21 are matched with the inclined surfaces of the guide driving rods 20, a return spring 22 is connected between the installation positioning plate 17 and the lower bottom of the chute 4, and transition supporting blocks 26 are fixedly installed at the bottom of the installation positioning plate 17, the elastic steel plate 5 is fixedly arranged on the transition supporting block 26, and the lowest surface of the anti-skid elastic cushion 6 is higher than the lowest surface of the movable roller 2 when the mounting positioning plate 17 is positioned at the upper limit position of the sliding chute 4;
by arranging the elastic steel plates 5, the double-shaft motor 16 and the plurality of movable rollers 2 which are symmetrically arranged, when the integral device is required, the mounting positioning plate 17 is positioned at the upper limit position of the sliding groove 4, and the movable rollers 2 are used as the supporting surface of the integral device, so that the integral device can move conveniently; when the whole device needs to be placed statically for display, the double-shaft motor 16 rotates, under the combined action of the triangular guide driving block 21, the guide driving rod 20 and the reset spring 22, the mounting and positioning plate 17 is driven to move downwards along the sliding groove 4, then the anti-skid elastic pad 6 is driven to touch the ground, the anti-skid elastic pad 6 serves as a contact surface between the whole device and the ground, and meanwhile, under the combined action of the first connecting rod 11 and the second connecting rod 12 which are hinged to each other, the elastic steel plate 5 and the pressure spring 14, and therefore the stability of the whole device placed on the ground is guaranteed and better improved.
The display platform assembly comprises a U-shaped display fixing frame 23 and a display placing platform 24 which are arranged on the base 1, the display placing platform 24 is fixedly arranged on the inner wall of the bottom of the U-shaped display fixing frame 23, and a magnetic adsorption plate 25 which is mutually adsorbed with the building model 100 is embedded in the upper surface of the display placing platform 24; therefore, the placing position of the building model 100 can be conveniently adjusted according to the placing requirement of the building model 100.
Further, in order to facilitate the corresponding adjustment of the display placement platform 24 according to the height of the house buyer, a height adjusting assembly is arranged between the base 1 and the U-shaped display fixing frame 23, the height adjusting assembly comprises a height adjusting frame 27 fixedly mounted on the base 1 and a height adjusting motor 28 fixedly mounted on the inner wall of the bottom of the height adjusting frame 27, third sliding grooves 31 are symmetrically formed in the inner wall of the side surface of the height adjusting frame 27, a yielding groove 29 is formed in the top of the height adjusting frame 27, second rotating screws 30 are symmetrically arranged on the two sides of the height adjusting motor 28, the second rotating screws 30 are rotatably mounted on the height adjusting frame 27, the second rotating screws 30 are in transmission connection with the height adjusting motor 28 through belt pairs 32, mounting support plates 33 matched with the second rotating screws 30 are arranged on the second rotating screws, and the mounting support plates 33 are slidably mounted in the third sliding grooves 31, an I-shaped positioning block 34 penetrating through the avoiding groove 29 is fixedly installed on the installation supporting plate 33, and the U-shaped display fixing frame 23 is fixedly installed on the I-shaped positioning block 34; through setting up height-adjusting motor 28, height-adjusting motor 28 is just reversing, connects through the transmission of belt pair 32, and the drive second rotates lead screw 30 and rotates, drives the fixed frame 23 lift of U type show through erection bracing board 33 then, is convenient for then show the corresponding regulation of 24 heights of place the platform according to the height of the person who buys to improve the suitability of integrated device.
The working principle of the embodiment is as follows: by arranging the elastic steel plates 5, the double-shaft motor 16 and the plurality of movable rollers 2 which are symmetrically arranged, when the integral device needs to move, the mounting positioning plate 17 is positioned at the upper limit position of the sliding groove 4, and the movable rollers 2 are used as the supporting surface of the integral device, so that the integral device can move conveniently; when the whole device needs to be placed statically for display, the double-shaft motor 16 rotates, under the combined action of the triangular guide driving block 21, the guide driving rod 20 and the reset spring 22, the mounting and positioning plate 17 is driven to move downwards along the sliding groove 4, then the anti-skid elastic pad 6 is driven to touch the ground, the anti-skid elastic pad 6 serves as a contact surface between the whole device and the ground, and meanwhile, under the combined action of the first connecting rod 11 and the second connecting rod 12 which are hinged to each other, the elastic steel plate 5 and the pressure spring 14, and therefore the stability of the whole device placed on the ground is guaranteed and better improved.
Example 2
The embodiment is further improved on the basis of the embodiment, and the improvement is that: the outer diameter of the display placing platform 24 is smaller than the inner diameter of the U-shaped display fixing frame 23, a protection assembly is arranged between the U-shaped display fixing frame 23 and the display placing platform 24, a T-shaped sliding groove 35 is formed in the outer side wall of the display placing platform 24, and the protection assembly comprises a protection ring 36 with damping and slidably mounted in the T-shaped sliding groove 35; by providing the guard ring 36, protection of the architectural model 100 is facilitated according to actual needs.
Specifically, a T-shaped sliding block 37 is fixedly mounted on the side wall of the protection ring 36 facing the T-shaped sliding groove 35, and the T-shaped sliding block 37 is slidably mounted in the T-shaped sliding groove 35 with damping; thereby realize the dynamic movement between guard ring 36 and show place the platform 24, and then be convenient for convenient height-adjusting to guard ring 36, whether decide to use guard ring 36 according to actual need.
The working principle of the embodiment is as follows: by providing the guard ring 36, protection of the architectural model 100 is facilitated according to actual needs.
Claims (5)
1. A mobile building model display device with good stability comprises a base (1), a plurality of mobile rollers (2) and a display platform assembly arranged on the base (1), and is characterized in that the base (1) is hollowed out and provided with an opening at the bottom, a hollowed-out support plate (3) is fixedly arranged at the bottom of the base (1), the mobile rollers (2) are uniformly distributed at the bottom of the hollowed-out support plate (3), a stable support assembly is arranged in the base (1), sliding grooves (4) are symmetrically formed in the inner wall of the side surface of the base (1), second sliding grooves (15) are symmetrically formed in the inner wall of the top of the base (1), and the stable support assembly comprises a stable support unit and a power unit for driving the stable support unit to vertically move;
the stable supporting unit comprises an elastic steel plate (5) and an anti-skidding elastic cushion (6), the elastic steel plate (5) is symmetrically arranged on a power unit, a plurality of damping units are uniformly distributed between the elastic steel plate (5), the elastic steel plate (5) is symmetrically arranged, a plurality of T-shaped sliding groove groups corresponding to the damping units one by one are arranged on the corresponding surface of the elastic steel plate (5), each T-shaped sliding groove group comprises an upper T-shaped sliding groove (7) and a lower T-shaped sliding groove (8), each damping unit comprises an upper T-shaped sliding block (9) and a lower T-shaped sliding block (10), the upper T-shaped sliding block (9) and the lower T-shaped sliding block (10) are slidably mounted in the upper T-shaped sliding groove (7), the upper T-shaped sliding block (9) is symmetrically arranged, and the lower T-shaped sliding block (10) is symmetrically arranged and a first connecting rod (11) which are hinged to each other are symmetrically arranged between the upper T-shaped sliding block (9) and the lower T-shaped sliding block (10) are symmetrically arranged The end parts of the first connecting rod (11) and the second connecting rod (12) are respectively rotatably mounted on an upper T-shaped sliding block (9) and a lower T-shaped sliding block (10), the upper T-shaped sliding block (9) and the lower T-shaped sliding block (10) are respectively connected with a pressure spring (14) between adjacent side walls of an upper T-shaped sliding chute (7) and a lower T-shaped sliding chute (8), two side surfaces of the first connecting rod (11) and the second connecting rod (12) which are mutually hinged are symmetrically provided with damping rubber strips (13), and the damping rubber strips (13) are fixedly mounted between the symmetrically arranged elastic steel plates (5);
the power unit comprises a double-shaft motor (16) fixedly mounted on the inner wall of the top of the base (1) and a mounting positioning plate (17) slidably mounted in a sliding groove (4), an output end fixed mounting rotating lead screw (18) of the double-shaft motor (16), the rotating lead screw (18) is rotatably mounted on the base (1), a driving slider (19) matched with the rotating lead screw is arranged on the rotating lead screw (18), the driving slider (19) is slidably mounted in a second sliding groove (15), a guide driving rod (20) is fixedly arranged at the bottom of the driving slider (19), the bottom surface of the guide driving rod (20) is arranged in an inclined plane, triangular guide driving blocks (21) corresponding to the guide driving rods (20) one by one are fixedly mounted on the upper surface of the mounting positioning plate (17), and the inclined plane of the triangular guide driving blocks (21) is matched with the inclined plane of the guide driving rod (20), the anti-skidding and anti-skidding device is characterized in that a reset spring (22) is connected between the installation positioning plate (17) and the lower bottom wall of the sliding groove (4), a transition supporting block (26) is fixedly installed at the bottom of the installation positioning plate (17), an elastic steel plate (5) is fixedly installed on the transition supporting block (26), and the lowest surface of the anti-skidding and anti-skidding elastic pad (6) is higher than the lowest surface of the moving roller (2) when the installation positioning plate (17) is located at the upper limit position of the sliding groove (4).
2. The mobile construction model display device with good stability according to claim 1, wherein the display stand assembly comprises a U-shaped display fixing frame (23) and a display placing stand (24) which are arranged on the base (1), the display placing stand (24) is fixedly arranged on the inner wall of the bottom of the U-shaped display fixing frame (23), and a magnetic adsorption plate (25) which is mutually adsorbed with the construction model (100) is embedded in the upper surface of the display placing stand (24).
3. The mobile building model display device with good stability according to claim 2, wherein a height adjusting component is arranged between the base (1) and the fixed frame (23) of the U-shaped display, the height adjusting component comprises a height adjusting frame (27) fixedly mounted on the base (1) and a height adjusting motor (28) fixedly mounted on the inner wall of the bottom of the height adjusting frame (27), a third sliding groove (31) is symmetrically formed in the inner wall of the side surface of the height adjusting frame (27), an avoiding groove (29) is formed in the top of the height adjusting frame (27), second rotating screw rods (30) are symmetrically arranged on the two sides of the height adjusting motor (28), the second rotating screw rods (30) are rotatably mounted on the height adjusting frame (27), and the second rotating screw rods (30) are in transmission connection with the height adjusting motor (28) through a belt pair (32), the second rotating screw rod (30) is provided with an installation supporting plate (33) matched with the second rotating screw rod, the installation supporting plate (33) is slidably installed in the third sliding groove (31), an I-shaped positioning block (34) penetrating through the avoiding groove (29) is fixedly installed on the installation supporting plate (33), and the U-shaped display fixing frame (23) is fixedly installed on the I-shaped positioning block (34).
4. The mobile building model display device with good stability according to claim 3, wherein the outer diameter of the display placing table (24) is smaller than the inner diameter of the U-shaped display fixing frame (23), a protection component is arranged between the U-shaped display fixing frame (23) and the display placing table (24), a T-shaped sliding groove (35) is formed in the outer side wall of the display placing table (24), and the protection component comprises a protection ring (36) with damping and slidably mounted in the T-shaped sliding groove (35).
5. The mobile construction model display device with good stability according to claim 4, wherein a T-shaped sliding block (37) is fixedly installed on the side wall of the protection ring (36) facing the T-shaped sliding groove (35), and the T-shaped sliding block (37) is slidably installed in the T-shaped sliding groove (35) with damping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022700977.8U CN214336133U (en) | 2020-11-20 | 2020-11-20 | Good portable building model display device of stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022700977.8U CN214336133U (en) | 2020-11-20 | 2020-11-20 | Good portable building model display device of stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214336133U true CN214336133U (en) | 2021-10-01 |
Family
ID=77895838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022700977.8U Expired - Fee Related CN214336133U (en) | 2020-11-20 | 2020-11-20 | Good portable building model display device of stability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214336133U (en) |
-
2020
- 2020-11-20 CN CN202022700977.8U patent/CN214336133U/en not_active Expired - Fee Related
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Granted publication date: 20211001 |