CN112829845A - Device for ascending and descending stairs in a family duplex building - Google Patents
Device for ascending and descending stairs in a family duplex building Download PDFInfo
- Publication number
- CN112829845A CN112829845A CN202110212324.1A CN202110212324A CN112829845A CN 112829845 A CN112829845 A CN 112829845A CN 202110212324 A CN202110212324 A CN 202110212324A CN 112829845 A CN112829845 A CN 112829845A
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- Prior art keywords
- chassis
- connecting rod
- standing plate
- downstairs
- rim
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D57/00—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track
- B62D57/02—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track with ground-engaging propulsion means, e.g. walking members
- B62D57/024—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track with ground-engaging propulsion means, e.g. walking members specially adapted for moving on inclined or vertical surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B19/00—Wheels not otherwise provided for or having characteristics specified in one of the subgroups of this group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/50—Improvement of
- B60B2900/551—Handling of obstacles or difficult terrains
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Handcart (AREA)
Abstract
The invention discloses a family duplex upstairs and downstairs device, which comprises wheels, a chassis and a standing plate, wherein the wheels are rotatably connected with the chassis; the wheel includes wheel hub and rim, and the quantity of rim is two at least, and a plurality of rims are around wheel hub's axis week form equipartition, and the rim is the column structure, and the radial cross-section of rim is fan-shaped, and the rim includes two plane side elevation and a cylinder side elevation, and one of them plane side elevation links to each other with wheel hub, and wheel hub rotationally links to each other with the chassis, and cylinder side elevation can with the stair step butt. When the device is used, a user or an article is positioned on the standing plate, the chassis drives the wheels to rotate, the cylindrical side vertical surfaces of the wheel rims rotate on the planes of the stair steps, the height of the stair steps is staggered by utilizing the space between the wheel rims, other cylindrical side vertical surfaces of the wheels are abutted with the next stair step, and the device can go upstairs and downstairs by changing the running direction of the chassis.
Description
Technical Field
The invention relates to the technical field of auxiliary upstairs and downstairs going equipment and peripheral supporting facilities thereof, in particular to a family duplex upstairs and downstairs going device.
Background
With the development of society, building elevators are popular, but in the family houses of the compound buildings, people need to go up and down stairs frequently in life, so that the people feel inconvenient, and corresponding devices are urgently needed to solve the problems in daily life.
The prior stair climbing device is rarely used in practice, is mostly a wheelchair, a baby carriage and the like for helping the old and children to go up and down stairs, has a complex structure and a large volume, and is not suitable for families; the wearable booster is provided, so that the use process is complicated and the wearable booster is not suitable for houses of complex buildings; the wheels for climbing stairs have the form of convex teeth meshed with the edges of the steps through teeth and connecting rods and trundles, and are complex in structure and difficult to popularize and apply.
Therefore, how to change the current situation that people go upstairs and downstairs and articles are inconvenient to carry in the duplex apartment in the prior art becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a household duplex type stair ascending and descending device, which is used for solving the problems in the prior art, facilitating personnel ascending and descending and carrying of articles in a duplex type house and improving user experience.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a family duplex upstairs and downstairs device, which comprises wheels, a chassis and a standing plate, wherein the wheels are rotatably connected with the chassis; the wheel includes wheel hub and rim, the quantity of rim is two at least, and is a plurality of the rim winds the circumference equipartition of wheel hub's axis, the rim is the columnar structure, the radial cross-section of rim is fan-shaped, the rim includes two plane side elevation and a cylinder side elevation, one of them the plane side elevation with wheel hub links to each other, wheel hub rotationally with the chassis links to each other, cylinder side elevation can with the stair step butt.
Preferably, the number of the wheel rims is three, the width of the plane side vertical surface is matched with the height of the stair steps, and the arc length of the cylindrical surface side vertical surface is matched with the width of the stair steps.
Preferably, the included angle between the two plane side vertical surfaces is 120 degrees, and the wheel rim is detachably connected with the wheel hub.
Preferably, a power assembly is connected to the chassis, and the power assembly is connected with the wheels by a transmission assembly.
Preferably, the number of the wheels is four, the connecting lines of the four wheels are rectangular, the chassis is connected with two axles, the axles are parallel to the width direction of the stairs, the wheels are connected to two ends of the axles, the axles are rotatably connected with the chassis, the transmission assembly comprises a transmission gear, a toothed belt wheel and a toothed belt, the output end of the power assembly is connected with the transmission gear, the transmission gear is connected with one of the axles, the number of the toothed belt wheels is four, and the toothed belt wheel coaxially arranged with the transmission gear drives the toothed belt wheel far away from the transmission gear to move by using the toothed belt.
Preferably, a first connecting rod and a second connecting rod are arranged at the bottom of the standing plate, the first connecting rod is arranged on one side, close to a step of a higher stair, of the standing plate, one end of the first connecting rod is connected with the chassis, and the other end of the first connecting rod is hinged with the standing plate; the second connecting rod is arranged on one side, close to a lower stair step, of the standing plate, one end of the second connecting rod is hinged to the chassis, the other end of the second connecting rod is hinged to the position adjusting block, the position adjusting block is slidably arranged on the standing plate, the position adjusting block is arranged on one side, close to the first connecting rod, of the second connecting rod, and the position adjusting block and the standing plate can be locked in relative positions.
Preferably, the standing plate is provided with a sliding groove, the position adjusting block is slidably arranged in the sliding groove, the sliding groove is long in strip shape, the direction of the sliding groove is perpendicular to the relative rotation axis of the second connecting rod and the chassis, the position adjusting block is connected with a fastening bolt and a fastening nut, the fastening bolt is in threaded connection with the fastening nut, and the fastening bolt and the fastening nut can fix the relative position of the position adjusting block and the standing plate.
Preferably, the standing plate is further provided with a handrail and a control panel.
Compared with the prior art, the invention has the following technical effects: the invention relates to a family duplex upstairs and downstairs device, which comprises wheels, a chassis and a standing plate, wherein the wheels are rotatably connected with the chassis; the wheel includes wheel hub and rim, and the quantity of rim is two at least, and a plurality of rims are around wheel hub's axis week form equipartition, and the rim is the column structure, and the radial cross-section of rim is fan-shaped, and the rim includes two plane side elevation and a cylinder side elevation, and one of them plane side elevation links to each other with wheel hub, and wheel hub rotationally links to each other with the chassis, and cylinder side elevation can with the stair step butt. When the device for going upstairs and downstairs of the family duplex building is used, a user or an article is positioned on the standing plate, the chassis drives the wheels to rotate, the cylindrical side vertical surfaces of the wheel rims rotate on the planes of the stair steps, the heights of the stair steps are staggered by utilizing the space between the wheel rims, other cylindrical side vertical surfaces of the wheels are abutted with the next stair step, and the going upstairs and downstairs of the device can be realized by changing the running direction of the chassis. The home duplex upstairs and downstairs device is simple in structure, stable in movement, convenient to use and suitable for popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a home multistoried upstairs/downstairs apparatus according to the present invention;
fig. 2 is a schematic structural view of a chassis of the home multistoried upstairs/downstairs apparatus of the present invention;
fig. 3 is a schematic view showing the construction of wheels of the home multistoried upstairs/downstairs apparatus of the present invention;
fig. 4 is a partial structural view of the home multistoried upstairs/downstairs apparatus of the present invention;
figure 5 is a schematic view of the home multistoried upstairs and downstairs apparatus of the present invention positioned at the bottom of the stairs;
figure 6 is a schematic view of the home multistoried upstairs and downstairs apparatus of the present invention positioned in the middle of a staircase;
figure 7 is a schematic view of the home multistoried upstairs and downstairs apparatus of the present invention positioned at the top of the stairs;
fig. 8 is a control schematic diagram of the home multistoried upstairs and downstairs apparatus of the present invention;
the device comprises a main body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a household duplex type stair ascending and descending device, which is used for solving the problems in the prior art, facilitating personnel ascending and descending and carrying of articles in a duplex type house and improving user experience.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 8, fig. 1 is a schematic structural view of a home multistoried upstairs and downstairs apparatus of the present invention, fig. 2 is a schematic structural view of a chassis of a home multistoried upstairs and downstairs apparatus of the present invention, fig. 3 is a schematic structural view of wheels of a home multistoried upstairs and downstairs apparatus of the present invention, fig. 4 is a partial schematic structural view of a home multistoried upstairs and downstairs apparatus of the present invention, fig. 5 is a schematic view of a home multistoried upstairs and downstairs apparatus of the present invention positioned at the bottom of a staircase, fig. 6 is a schematic view of a home multistoried upstairs and downstairs apparatus of the present invention positioned at the middle of a staircase, fig. 7 is a schematic view of a home multistoried upstairs and downstairs apparatus of the present invention positioned at the top.
The invention provides a family duplex upstairs and downstairs device 100a, which comprises wheels 1, a chassis 2 and a standing plate 3, wherein the wheels 1 are rotatably connected with the chassis 2, and the standing plate 3 is arranged at the top of the chassis 2; the wheel 1 comprises a hub 4 and rims 5, the number of the rims 5 is at least two, the rims 5 are uniformly distributed around the axis of the hub 4 in a circumferential mode, the rims 5 are of a cylindrical structure, the radial cross sections of the rims 5 are fan-shaped, each rim 5 comprises two plane side vertical surfaces 501 and one cylindrical side vertical surface 502, one plane side vertical surface 501 is connected with the hub 4, the hub 4 is rotatably connected with a chassis 2, and the cylindrical side vertical surfaces 502 can be abutted to stair steps.
When the household compound upstairs and downstairs going device 100a is used, users or articles are positioned on the standing plate 3, the chassis 2 drives the wheels 1 to rotate, the cylindrical side elevation 502 of the wheel rim 5 rotates on the plane of the stair steps, the height of the stair steps is staggered by utilizing the space between the wheel rims 5, other cylindrical side elevations 502 of the wheels 1 are abutted with the next stair steps, and the upstairs and downstairs going device can be realized by changing the running direction of the chassis 2. The home duplex upstairs and downstairs device 100a has the advantages of simple structure, stable movement and convenient use, and is suitable for popularization and application.
The number of the wheel rims 5 is three, the width of the plane side vertical surface 501 is matched with the height of the stair steps, and the arc length of the cylindrical side vertical surface 502 is matched with the width of the stair steps. When the device is used, the cylindrical side vertical faces 502 are in contact with the plane of the stair steps, the cylindrical side vertical faces 502 roll on the horizontal plane, the heights of the stair steps are staggered by utilizing the two adjacent cylindrical side vertical faces 502, the plane side vertical faces 501 are abutted to the step vertical faces of the stairs, and the next cylindrical side vertical face 502 is in contact with the step vertical face of the next stair and rolls, so that the device can run on the stairs.
In other embodiments of the present invention, the included angle between the two plane vertical sides 501 is 120 °, the rim 5 is one third of a cylinder, and the rim 5 is detachably connected to the hub 4, so as to facilitate replacement and maintenance.
Specifically, chassis 2 is connected with power component 6, and power component 6 utilizes drive assembly 7 to link to each other with wheel 1, and power component 6 can drive wheel 1 and rotate to the realization is downstairs.
In the embodiment, the number of the wheels 1 is four, the connecting line of the four wheels 1 is rectangular, the chassis 2 is connected with two axles 13, the axles 13 are parallel to the width direction of the stairs, the wheels 1 are connected to two ends of the axles 13, the axles 13 are rotatably connected to the chassis 2, the transmission assembly 7 comprises a transmission gear 701, a toothed belt wheel 702 and a toothed belt 703, the output end of the power assembly 6 is connected to the transmission gear 701, the transmission gear 701 is connected to one of the axles 13, the number of the toothed belt wheels 702 is four, and the toothed belt wheels 702 coaxially arranged with the transmission gear 701 drive the toothed belt wheel 702 far away from the transmission gear 701 to move by using the toothed belt 703. The power assembly 6 selects a speed reducing motor with a brake, the power assembly 6 drives the toothed belt wheel 702 to rotate by using the transmission gear 701, then the toothed belt wheel 702 is matched with the toothed belt 703 to drive the two axles 13 to move, and the axles 13 drive the wheels 1 to rotate.
More specifically, the bottom of the standing plate 3 is provided with a first connecting rod 8 and a second connecting rod 9, the first connecting rod 8 is arranged on one side of the standing plate 3 close to a higher stair step, one end of the first connecting rod 8 is connected with the chassis 2, and the other end of the first connecting rod 8 is hinged with the standing plate 3; the second connecting rod 9 is arranged on one side, close to a lower stair step, of the standing plate 3, the second connecting rod 9 is located at the bottom of the standing plate 3, the standing plate 3 is connected with a position adjusting block 10, the position adjusting block 10 is slidably arranged on the standing plate 3, one end of the second connecting rod 9 is hinged to the chassis 2, the other end of the second connecting rod 9 is hinged to the position adjusting block 10, the standing plate 3 is always kept in a horizontal state in the upstairs and downstairs processes, sliding of users or articles is avoided, and stability of the standing plate 3 is improved; the relative position of position control piece 10 and the board 3 of standing can be adjusted, changes the contained angle of second connecting rod 9 and chassis 2 then, and simultaneously, head rod 8 is articulated with the board 3 of standing, and the board 3 of conveniently standing rotates to the contained angle between board 3 and the chassis 2 is stood in the adjustment, makes the board 3 of standing can adapt to different stairs.
Furthermore, the standing plate 3 is provided with a sliding groove, the position adjusting block 10 is slidably arranged in the sliding groove, the sliding groove is long-strip-shaped, the length direction of the sliding groove is perpendicular to the second connecting rod 9 and the relative rotation axis of the chassis 2, the position adjusting block 10 is connected with a fastening bolt 11 and a fastening nut 12, the fastening bolt 11 is matched with the fastening nut 12 to fix the relative position of the position adjusting block 10 and the standing plate 3, the relative position of the position adjusting block 10 and the standing plate 3 is changed, and the second connecting rod 9 rotates, so that the purpose of adjusting the included angle between the standing plate 3 and the chassis 2 is achieved, the standing plate 3 is kept horizontal and is suitable for stairs with various specifications, and the adaptability of the device is improved; when transferring, placer, still can fall second connecting rod 9 and standing board 3, save space, conveniently accomodate and transport.
Besides, the standing plate 3 is also provided with a handrail 14 and a control panel 15, and the control panel 15 is convenient for a user to control.
The control principle of the home multistoried upstairs/downstairs apparatus 100a according to the present invention will be explained with reference to fig. 8. The device is controlled to go upstairs and downstairs by controlling the rotation direction of the motor. Control components KM1 and KM2 are AC contactor, FU is the fuse, carry out main circuit and control circuit short-circuit protection, FR thermal relay carries out overload protection, SB1 is the stop button on the device, SB11 is the stop button below the stair, SB12 is the stop button on the stair, SB2 and SB21 are upstairs starting button, be located control panel 15 and the stair respectively, SB3 and SB31 are downstairs starting button, be located control panel 15 and the stair respectively.
Going upstairs control: the power switch Q is switched on, the starting button is pressed, SB2 or SB21 is pressed, a coil of the contactor KM1 is electrified and attracted, a main contact is closed, an auxiliary contact is closed and self-locked at the same time, the power supply of the motor is switched on, the motor rotates forwards and moves up the stair, when the wheel 1 touches the travel switch SQ1 (the travel switch SQ1 is positioned at the top of the stair), the coil of the KM1 is powered off, the auxiliary contact is opened, and therefore the forward control circuit is switched off, and the motor is stopped.
Controlling downstairs: when a reverse starting button is pressed, a SB3 or SB31 coil of a contactor KM2 is electrified and attracted, a main contact is closed, an auxiliary contact is closed and self-locked, the main circuit is electrified, the motor is started and reversely rotated, the device moves to touch a travel switch SQ2 (the travel switch SQ2 is positioned at the bottom of a stair), the KM2 coil is powered off, the auxiliary contact is opened, and therefore a reverse control circuit is cut off, and the motor is stopped.
The home duplex upstairs and downstairs going device 100a realizes automatic upstairs and downstairs going up and down under the support of 4 wheels 1, can brake when stopping, and prevents overturn when going upstairs and downstairs going up and down; the device is convenient for people to get on and off and is provided with a handrail 14; the device can be started and stopped at any time during operation, and can also be automatically stopped after being operated in place; the user's position may be automatically returned to when the user's position and the device's position are different. Small size and compact structure.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a family's compound floor stairs-mover, its characterized in that: the wheel can be rotatably connected with the chassis, and the standing plate is arranged at the top of the chassis; the wheel includes wheel hub and rim, the quantity of rim is two at least, and is a plurality of the rim winds the circumference equipartition of wheel hub's axis, the rim is the columnar structure, the radial cross-section of rim is fan-shaped, the rim includes two plane side elevation and a cylinder side elevation, one of them the plane side elevation with wheel hub links to each other, wheel hub rotationally with the chassis links to each other, cylinder side elevation can with the stair step butt.
2. A home compound upstairs or downstairs arrangement as claimed in claim 1, wherein: the number of the wheel rims is three, the width of the plane side vertical surface is matched with the height of the stair steps, and the arc length of the cylindrical surface side vertical surface is matched with the width of the stair steps.
3. A home compound upstairs or downstairs arrangement as claimed in claim 1, wherein: the included angle between the two plane side vertical surfaces is 120 degrees, and the wheel rim is detachably connected with the wheel hub.
4. A home compound upstairs or downstairs arrangement as claimed in claim 1, wherein: the chassis is connected with a power assembly, and the power assembly is connected with the wheels through a transmission assembly.
5. A home compound upstairs or downstairs arrangement as claimed in claim 4, wherein: the number of the wheels is four, connecting lines of the four wheels are rectangular, the chassis is connected with two axles, the axles are parallel to the width direction of the stairs, the wheels are connected to two ends of the axles, the axles are rotatably connected with the chassis, the transmission assembly comprises a transmission gear, a toothed belt wheel and a toothed belt, the output end of the power assembly is connected with the transmission gear, the transmission gear is connected with one of the axles, the number of the toothed belt wheels is four, and the toothed belt wheel coaxially arranged with the transmission gear drives the toothed belt wheel far away from the transmission gear to move by utilizing the toothed belt.
6. A home compound upstairs or downstairs arrangement as claimed in claim 1, wherein: a first connecting rod and a second connecting rod are arranged at the bottom of the standing plate, the first connecting rod is arranged on one side, close to a step of a higher stair, of the standing plate, one end of the first connecting rod is connected with the chassis, and the other end of the first connecting rod is hinged with the standing plate; the second connecting rod is arranged on one side, close to a lower stair step, of the standing plate, one end of the second connecting rod is hinged to the chassis, the other end of the second connecting rod is hinged to the position adjusting block, the position adjusting block is slidably arranged on the standing plate, the position adjusting block is arranged on one side, close to the first connecting rod, of the second connecting rod, and the position adjusting block and the standing plate can be locked in relative positions.
7. A home compound upstairs or downstairs arrangement as claimed in claim 6, wherein: the standing plate is provided with a sliding groove, the position adjusting block is slidably arranged in the sliding groove, the sliding groove is long in strip shape, the direction of the sliding groove is perpendicular to the relative rotating axis of the second connecting rod and the chassis, the position adjusting block is connected with a fastening bolt and a fastening nut, the fastening bolt is in threaded connection with the fastening nut, and the fastening bolt and the fastening nut can fix the relative position of the position adjusting block and the standing plate.
8. A home compound upstairs or downstairs arrangement as claimed in claim 1, wherein: the standing plate is also provided with a handrail and a control panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110212324.1A CN112829845A (en) | 2021-02-25 | 2021-02-25 | Device for ascending and descending stairs in a family duplex building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110212324.1A CN112829845A (en) | 2021-02-25 | 2021-02-25 | Device for ascending and descending stairs in a family duplex building |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112829845A true CN112829845A (en) | 2021-05-25 |
Family
ID=75933487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110212324.1A Pending CN112829845A (en) | 2021-02-25 | 2021-02-25 | Device for ascending and descending stairs in a family duplex building |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112829845A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2037331U (en) * | 1988-06-22 | 1989-05-10 | 唐思义 | Dual-purpose cart for stairs and ground |
| EP0526088A1 (en) * | 1991-07-23 | 1993-02-03 | TZORA FURNITURE INDUSTRIES Ltd. | Wheelchairs |
| US6328120B1 (en) * | 1999-11-16 | 2001-12-11 | Forschungszentrum Karlsruhe Gmbh | Stair climbing vehicle |
| CN105213119A (en) * | 2015-09-30 | 2016-01-06 | 河南科技大学 | A kind of stair-climbing wheel chair |
| CN110155136A (en) * | 2019-05-10 | 2019-08-23 | 广东汉威城建有限公司 | The electronic auxiliary conveying device of stair |
| CN214356350U (en) * | 2021-02-25 | 2021-10-08 | 陕西理工大学 | Family's double entry stair device of going up and down |
-
2021
- 2021-02-25 CN CN202110212324.1A patent/CN112829845A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2037331U (en) * | 1988-06-22 | 1989-05-10 | 唐思义 | Dual-purpose cart for stairs and ground |
| EP0526088A1 (en) * | 1991-07-23 | 1993-02-03 | TZORA FURNITURE INDUSTRIES Ltd. | Wheelchairs |
| US6328120B1 (en) * | 1999-11-16 | 2001-12-11 | Forschungszentrum Karlsruhe Gmbh | Stair climbing vehicle |
| CN105213119A (en) * | 2015-09-30 | 2016-01-06 | 河南科技大学 | A kind of stair-climbing wheel chair |
| CN110155136A (en) * | 2019-05-10 | 2019-08-23 | 广东汉威城建有限公司 | The electronic auxiliary conveying device of stair |
| CN214356350U (en) * | 2021-02-25 | 2021-10-08 | 陕西理工大学 | Family's double entry stair device of going up and down |
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Application publication date: 20210525 |