CN112826192A - Multifunctional walking stick for assisting old people to go upstairs and downstairs - Google Patents
Multifunctional walking stick for assisting old people to go upstairs and downstairs Download PDFInfo
- Publication number
- CN112826192A CN112826192A CN202110400586.0A CN202110400586A CN112826192A CN 112826192 A CN112826192 A CN 112826192A CN 202110400586 A CN202110400586 A CN 202110400586A CN 112826192 A CN112826192 A CN 112826192A
- Authority
- CN
- China
- Prior art keywords
- piece
- connecting rod
- rod
- locking
- crutch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 241001166076 Diapheromera femorata Species 0.000 title abstract description 7
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000004579 marble Substances 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims 1
- 210000002414 leg Anatomy 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000000629 knee joint Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45B—WALKING STICKS; UMBRELLAS; LADIES' OR LIKE FANS
- A45B9/00—Details
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45B—WALKING STICKS; UMBRELLAS; LADIES' OR LIKE FANS
- A45B9/00—Details
- A45B9/02—Handles or heads
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45B—WALKING STICKS; UMBRELLAS; LADIES' OR LIKE FANS
- A45B9/00—Details
- A45B2009/002—Accessories
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45B—WALKING STICKS; UMBRELLAS; LADIES' OR LIKE FANS
- A45B9/00—Details
- A45B2009/005—Shafts
- A45B2009/007—Shafts of adjustable length, e.g. telescopic shafts
Abstract
A multifunctional crutch for assisting the old to go upstairs and downstairs comprises a track, a connecting piece and a crutch handrail; the connecting piece is slidably arranged on the track, and the crutch handrail comprises a telescopic rod, a connecting rod, a handle piece, a hand-held piece, a locking piece and a locking rod; the telescopic rod and the connecting rod are hollow cylindrical bodies, the telescopic rod is arranged in one end of the connecting rod, the connecting rod positioned in the open through groove is sleeved with the hand-holding part, the locking rod extends into the connecting rod from the other end of the connecting rod and is fixedly connected with the hand-holding part through a bolt penetrating through the open through groove, the locking rod is slidably arranged on the handle part and the connecting part in a penetrating manner, the hand-holding part is inserted into the locking part and can move along the axial direction of the connecting rod, and the locking part and the hand-; the spring is sleeved on the lock rod, two ends of the spring are respectively abutted against the other end of the connecting rod and the lock tongue of the lock rod, the handle piece is fixedly connected with the other end of the connecting rod, and the handle piece is inserted on the connecting piece and limited. The walking stick is firm in structure and convenient to carry.
Description
Technical Field
The invention provides a portable multifunctional crutch for assisting the old to go upstairs and downstairs, belonging to the field of articles for old-people-assisting living.
Background
For the elderly, the legs and feet of the elderly become more difficult to walk or stand for a long time with the age. In the more difficult process of going up and down stairs, the knee joint bears the weight of the body at an angle close to 90 degrees, so that the old is easy to wear the knee joint and cause leg and foot weakness, and the old slips to be injured. Particularly, for the old people living in the old double-storied buildings, climbing stairs is a problem which is difficult to surmount every day, the events that the old people fall down and are injured on the stairs due to the inconvenience of legs and feet frequently occur, the constitution of the old people is poor, and therefore major accidents such as fracture and the like easily occur. At present, an elevator is installed in a floor, but for an old house, because the floor is not very high, the house is relatively old, the cost for installing the elevator is high, and the elevator is difficult to popularize due to the adverse effect on bottom residents. Therefore, a simple and easily detachable handrail is urgently needed to protect the old who have inconvenient legs and feet from falling down on the stairs.
The anti-falling power-assisted walking aid crutch disclosed in the publication No. CN210492949U is formed by hooking a J-shaped crutch with an original stair handrail to form a cantilever beam structure, so that the problems of power assistance, falling prevention and cost of the old people going upstairs are solved, but the old people need to move the whole crutch and clamp the position of the old people every step of going upstairs or downstairs, and the total standing time of the old people is prolonged.
Disclosure of Invention
The invention provides a multifunctional crutch for assisting the old to go upstairs and downstairs in order to overcome the prior art. The crutch has firm structure and is convenient to carry.
A multifunctional crutch for assisting the old to go upstairs and downstairs comprises a track, a connecting piece and a crutch handrail; the connecting piece is slidably arranged on the track, and the walking stick handrail comprises a telescopic rod, a connecting rod, a handle piece, a hand-held piece, a locking piece and a locking rod; the telescopic rod and the connecting rod are hollow cylindrical bodies, a telescopic rod is arranged in one end of the connecting rod, a section of open through groove is processed on the connecting rod along the axial direction, a holding part is sleeved on the connecting rod positioned in the open through groove, a locking rod extends into the connecting rod from the other end of the connecting rod and is fixedly connected with the holding part through a bolt penetrating through the open through groove, the locking rod slidably penetrates through the handle part and the connecting part, the holding part is inserted into the locking part and can move along the axial direction of the connecting rod, so that the locking tongue on the locking rod is clamped on the track or separated from the track, the locking part is sleeved on the connecting rod and can rotate along the circumferential;
the spring is sleeved on the lock rod, two ends of the spring are respectively abutted against the other end of the connecting rod and the lock tongue of the lock rod, the handle piece is fixedly connected with the other end of the connecting rod, and the handle piece is inserted on the connecting piece and limited.
Compared with the prior art, the invention has the beneficial effects that:
the portable multifunctional portable handheld work platform is convenient to carry, realizes the design concepts of one structure and two functions, and has the following beneficial effects: alright use under the original handrail structure of repacking realizes that the old man can remove the walking stick handrail along stair and obtain the helping hand and prevent to slide to, can directly lie prone on the handrail during tired and have a rest, can regard it as the walking stick after the walking stick handrail is pulled down. The device has the advantages of simple structure, convenient installation, strong firmness and lower cost.
The technical scheme of the invention is further explained by combining the drawings and the embodiment:
drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a partial exploded view of the present invention;
FIG. 4 is a schematic perspective view of a connecting rod;
FIG. 5 is a schematic perspective view of the telescopic rod;
FIG. 6 is a perspective view of the locking bar;
FIG. 7 is a schematic view of one half of the retaining member;
FIG. 8 is a schematic view of the other half of the retaining member;
FIG. 9 is a perspective view of one half of the hand grip;
FIG. 10 is a perspective view of the other half of the hand grip shown from an orientation;
FIG. 11 is a perspective view of the other half of the hand grip shown from another orientation;
FIG. 12 is a perspective view of the connector as viewed from the side;
FIG. 13 is a perspective view of the connector as viewed generally from the top;
FIG. 14 is a schematic view of a track
Fig. 15 is a schematic view of another track.
Detailed Description
Referring to fig. 1 to 6, the multifunctional crutch for assisting the elderly to go upstairs and downstairs according to the present embodiment includes a rail 1, a connecting member 2, and a crutch handrail 3; the connecting piece 2 is arranged on the track 1 in a sliding way, and the crutch armrest 3 comprises a telescopic rod 39, a connecting rod 37, a handle piece 32, a hand-held piece 34, a locking piece 36 and a locking rod 31; the telescopic rod 39 and the connecting rod 37 are both hollow cylindrical bodies, the telescopic rod 39 is arranged in one end of the connecting rod 37, a section of open through groove 37-1 is axially processed on the connecting rod 37, a hand-held piece 34 is sleeved on the connecting rod 37 positioned in the open through groove 37-1, the lock rod 31 extends from the other end of the connecting rod 37 and is fixedly connected with the hand-held piece 34 through a bolt 35 penetrating through the open through groove, the lock rod 31 slidably penetrates through the handle piece 32 and the connecting piece 2, the hand-held piece 34 is inserted into the locking piece 36 and can move along the axial direction of the connecting rod 37, so that a lock tongue 31-0 on the lock rod 31 is clamped on the track 1 or separated from the track 1, the locking piece 36 is sleeved on the connecting rod 37 and can rotate along the circumferential direction, and;
the spring 33 is sleeved on the lock rod 31, two ends of the spring 33 are respectively abutted against the other end of the connecting rod 37 and the lock tongue of the lock rod 31, the handle piece 32 is fixedly connected with the other end of the connecting rod 37, and the handle piece 32 is inserted on the connecting piece 2 and limited.
The middle rail 1 can be directly installed on the original handrail in a simple and convenient mode on the spot or directly transform the original handrail into the rail 1.
Further, the locking member 36 is a cylinder with a ring groove, the annular protrusion 37-2 on the connecting rod 37 is arranged in the ring groove, and the locking member 36 can rotate along the circumferential direction of the annular protrusion 37-2. As shown in FIGS. 7 and 8, the cylindrical locking member may be constructed of one half 36-1 and the other half 36-2, and the annular groove 36-4 of the locking member 36 may be axially restrained within the annular projection 37-2 so as to be only circumferentially rotatable.
Furthermore, as shown in fig. 1, 9 and 10, the hand-held component 34 is a stepped tubular component, the first-order barrel of the hand-held component 34 is inserted into the locking component 36, a sliding groove 34-1 is axially formed on the wall of the first-order barrel adjacent to the second-order barrel, a positioning notch 34-2 is circumferentially formed on the wall of the first-order barrel, the sliding groove 34-1 is communicated with the positioning notch 34-2, the locking component 36 is provided with a convex rib 36-0, the convex rib 36-0 can axially slide in the sliding groove 34-1, as shown in fig. 3, the convex rib 36-0 can be clamped in the positioning notch 34-2 after the locking component 36 is rotated, and the hand-held component 34 is locked. As shown in fig. 9-11, the hand grip 34 may also be constructed of one half 34-01 and the other half 34-02 with the slot 34-1 and the positioning notch 34-2 being formed in the other half 34-02.
As shown in fig. 1, 14 and 15, the rail 1 is a groove-shaped rail, a positioning rack 1-1 is processed on the inner bottom surface of the groove-shaped rail, and the bolt of the lock rod 31 can be clamped by the positioning rack 1-1.
In one embodiment, as shown in fig. 4, the teeth of the positioning rack 1-1 have a quadrangular frustum pyramid cross section, and a plane for supporting the locking tongue 31-0 is arranged between two adjacent teeth. Alternatively, two positioning racks 1-1 are made.
In another embodiment, as shown in fig. 5, the teeth of the positioning rack 1-1 have triangular prism sections, and a plane for supporting the locking tongue 31-0 is formed between two adjacent teeth.
Further, as shown in fig. 12 and 13, the connecting member 2 is a three-way square tube formed by vertically connecting a horizontal tube 2-1 and a vertical tube 2-2, as shown in fig. 1, the vertical tube 2-2 slidably penetrates through the track 1, and the handle member 32 is inserted into the horizontal tube 2-1 and is limited. The handle elements 32 are axially limited by means of insert plates inserted longitudinally into the cross tube 2-1.
Preferably, as shown in fig. 2 and 3, the handle member 32 is a square tube with a handle, one end of the square tube is connected with the other end of the connecting rod 37, the horizontal tube 2-1 and the handle are provided with slots, after the other end of the square tube with the handle is inserted into the horizontal tube 2-1, the handle member 32 is fixed and limited with the horizontal tube 2-1 by an inserting plate inserted into the slots. As shown in fig. 1-3, the longitudinal pipe 2-2 is firstly sleeved on the rail 1, and after the lock rod 31 is inserted into the transverse pipe 2-1, the insert plate is longitudinally inserted to prevent falling off.
As shown in fig. 2-5, a crutch marble is arranged in the telescopic rod 39, a plurality of pairs of through holes 37-3 are arranged on the connecting rod 37 along the length direction, and the telescopic rod 39 extends into the connecting rod 37 and is positioned in the through holes 37-3 by a positioning ball on the crutch marble to realize position adjustment. A crutch marble is arranged at the position hole 39-1 in the telescopic rod 39.
The using method of the invention is as follows: the longitudinal pipe 2-2 is firstly sleeved on the rail 1, the lock rod 31 is inserted into the transverse pipe 2-1, and then the insert plate is longitudinally inserted to prevent falling off, after the assembly, when going upstairs, as shown in fig. 2, the locking part 36 and the front end of the connecting rod 37 are held, as the inclination angle of the lock tongue 37-0 is smaller, the spring 33 is a variety with smaller elastic coefficient, the lock tongue 37-0 can be pushed along the direction of the stairs with smaller force, at the moment, the lock tongue 37-0 retracts backwards (compresses towards the direction of the telescopic rod 39), the spring 33 is compressed, and after passing one tooth on the positioning rack 1-1, the lock tongue 37-0 returns to the original position under the potential energy of the spring. The retraction of the bolt 37-0 is repeated one time over a tooth until pushed into place and at which time the bolt 37-0 is caught by the teeth in the positioning rack 1-1. Then the user can hold the crutch handrail 3 to go upstairs, and after the user stably stands, the steps are repeated as above to realize assisting to go upstairs.
When going down stairs, one hand holds the hand-held piece 34, the other hand holds the telescopic rod 39, when the user needs to go down, the hand-held piece 34 is pulled outwards (pulled towards the telescopic rod 39), the crutch handrail 3 is pushed to drive the connecting piece 2 to slide along the track 1, the hand-held piece 34 is loosened after the user arrives at the next step, the baffle plate 31 rebounds under the action of the spring and is abutted against the track 1, and the baffle plate is clamped and fixed by the teeth on the positioning rack 1-1 and stays at the original position. And when the old people stably stand on the next step, repeating the actions. After the stair is finished and the inserting plate is pulled out, the crutch handrail 3 is pulled out from the connecting piece 2, the hand-held piece 34 is pulled outwards (pulled towards the telescopic rod 39), the self-locking piece 36 is rotated, and the bolt is retracted into the handle piece 32 to become the crutch.
The present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the invention.
Claims (9)
1. A multifunctional crutch for assisting the old man to go upstairs and downstairs comprises a track (1), a connecting piece (2) and a crutch handrail (3); connecting piece (2) slidable sets up on track (1), its characterized in that: the crutch armrest (3) comprises a telescopic rod (39), a connecting rod (37), a handle piece (32), a hand-held piece (34), a locking piece (36) and a locking rod (31); the telescopic rod (39) and the connecting rod (37) are hollow cylindrical bodies, a telescopic rod (39) is arranged in one end of the connecting rod (37), a section of open through groove (37-1) is processed on the connecting rod (37) along the axial direction, a hand-held part (34) is sleeved on the connecting rod (37) positioned in the open through groove (37-1), a lock rod (31) extends into the other end of the connecting rod (37) and is fixedly connected with the hand-held part (34) through a bolt (35) penetrating through the open through groove, the lock rod (31) slidably penetrates through the handle part (32) and the connecting part (2), the hand-held part (34) is inserted into a locking part (36) and can move along the axial direction of the connecting rod (37) so as to realize that a locking tongue (31-0) of the lock rod (31) is clamped on the track (1) or separated from the track (1), and the locking part (36, the locking piece (36) and the hand-held piece (34) are provided with mutually matched locking parts;
the spring (33) is sleeved on the lock rod (31), two ends of the spring (33) are respectively abutted against the other end of the connecting rod (37) and a lock tongue of the lock rod (31), the handle piece (32) is fixedly connected with the other end of the connecting rod (37), and the handle piece (32) is inserted into the connecting piece (2) and limited.
2. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 1, which is characterized in that: retaining member (36) are the tube-shape piece of belt wheel groove, and annular bulge (37-2) on connecting rod (37) are arranged in the annular, and retaining member (36) can be followed annular bulge (37-2) circumferential direction and rotated.
3. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 2, which is characterized in that: the hand-held piece (34) is a stepped cylindrical piece, a first-order barrel of the hand-held piece (34) is inserted into the locking piece (36), a sliding groove (34-1) is formed in the wall of the first-order barrel adjacent to the second-order barrel in the axial direction, a positioning opening (34-2) is formed in the wall of the first-order barrel adjacent to the second-order barrel in the circumferential direction, the sliding groove (34-1) is communicated with the positioning opening (34-2), a convex rib (36-0) is formed in the locking piece (36), the convex rib (36-0) can slide in the sliding groove (34-1) in the axial direction, the convex rib (36-0) can be clamped in the positioning opening (34-2) after the locking piece (36) is rotated, and the hand-.
4. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 1, which is characterized in that: the track (1) is a groove-shaped track, a positioning rack (1-1) is machined on the inner bottom surface of the groove-shaped track, and a bolt of the lock rod (31) can be clamped by the positioning rack (1-1).
5. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 4, which is characterized in that: the connecting piece (2) is a three-way square tube which is formed by vertically connecting a transverse tube (2-1) and a longitudinal tube (2-2), the longitudinal tube (2-2) can be slidably arranged on the track (1) in a penetrating way, and the handle piece (32) is inserted in the transverse tube (2-1) and is limited.
6. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 5, which is characterized in that: the telescopic rod (39) is internally provided with a crutch marble, a plurality of pairs of through holes (37-3) are formed in the connecting rod (37) along the length direction, and the telescopic rod (39) extends into the connecting rod (37) and is positioned in the through holes (37-3) by positioning beads on the crutch marble to realize position adjustment.
7. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 5, which is characterized in that: the handle piece (32) is a square tube with a handle, one end of the square tube is connected with the other end of the connecting rod (37), the horizontal tube (2-1) and the handle are provided with slots, the other end of the square tube with the handle is inserted into the horizontal tube (2-1), and the handle piece (32) is fixed and limited with the horizontal tube (2-1) through an inserting plate inserted into the slots.
8. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 4 or 5, which is characterized in that: the cross section of the teeth on the positioning rack (1-1) is a quadrangular frustum pyramid, and a plane for supporting the lock tongue (31-0) is arranged between every two adjacent teeth.
9. The multifunctional crutch for assisting the elderly to go upstairs and downstairs according to claim 4 or 5, which is characterized in that: the cross section of the teeth on the positioning rack (1-1) is triangular prism, and a plane for supporting the lock tongue (31-0) is arranged between every two adjacent teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400586.0A CN112826192A (en) | 2021-04-14 | 2021-04-14 | Multifunctional walking stick for assisting old people to go upstairs and downstairs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400586.0A CN112826192A (en) | 2021-04-14 | 2021-04-14 | Multifunctional walking stick for assisting old people to go upstairs and downstairs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112826192A true CN112826192A (en) | 2021-05-25 |
Family
ID=75929874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110400586.0A Pending CN112826192A (en) | 2021-04-14 | 2021-04-14 | Multifunctional walking stick for assisting old people to go upstairs and downstairs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112826192A (en) |
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| TW200841872A (en) * | 2007-04-27 | 2008-11-01 | Nan Kai Inst Technology | Assistant device for assisting climbing up and down stairs |
| CN104857589A (en) * | 2015-06-04 | 2015-08-26 | 苏州市瑞晟医疗器械有限公司 | Stainless steel infusion support |
| CN104873362A (en) * | 2015-06-04 | 2015-09-02 | 苏州市瑞晟医疗器械有限公司 | Telescopic crutch |
| CN207022070U (en) * | 2017-07-13 | 2018-02-16 | 董学标 | A kind of handset mounting |
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| CN209262069U (en) * | 2018-12-04 | 2019-08-16 | 深圳市科卫泰实业发展有限公司 | A kind of railroad with locking mechanism |
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| CN210300834U (en) * | 2019-05-30 | 2020-04-14 | 江苏医药职业学院 | Hemiplegia patient nurses with supplementary device of going to lavatory of adjustable height |
| CN210622144U (en) * | 2019-06-21 | 2020-05-26 | 湘潭医卫职业技术学院 | Multifunctional slide rail type stair railing |
| CN211703767U (en) * | 2020-01-06 | 2020-10-20 | 宁波金雨科技实业有限公司 | Oil-free and glue-free environment-friendly middle bundle core structure |
| CN212260786U (en) * | 2020-04-28 | 2021-01-01 | 宁波金雨科技实业有限公司 | Full PET environmental protection lipstick pipe that base and fork combine |
| CN112438469A (en) * | 2020-12-02 | 2021-03-05 | 张家港江苏科技大学产业技术研究院 | Power-assisted walking stick for going upstairs and downstairs |
-
2021
- 2021-04-14 CN CN202110400586.0A patent/CN112826192A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200943428Y (en) * | 2006-08-14 | 2007-09-05 | 胡晓鹰 | Metal rail door and window angle joint |
| TW200841872A (en) * | 2007-04-27 | 2008-11-01 | Nan Kai Inst Technology | Assistant device for assisting climbing up and down stairs |
| CN104857589A (en) * | 2015-06-04 | 2015-08-26 | 苏州市瑞晟医疗器械有限公司 | Stainless steel infusion support |
| CN104873362A (en) * | 2015-06-04 | 2015-09-02 | 苏州市瑞晟医疗器械有限公司 | Telescopic crutch |
| CN207022070U (en) * | 2017-07-13 | 2018-02-16 | 董学标 | A kind of handset mounting |
| CN108309706A (en) * | 2018-02-09 | 2018-07-24 | 温州伊诺韦特科技有限公司 | A kind of medical Oxter crutch of high safety performance |
| CN108390625A (en) * | 2018-04-09 | 2018-08-10 | 绍兴文理学院 | A kind of portable solar photovoltaic bracket |
| CN209262069U (en) * | 2018-12-04 | 2019-08-16 | 深圳市科卫泰实业发展有限公司 | A kind of railroad with locking mechanism |
| CN110169644A (en) * | 2019-05-25 | 2019-08-27 | 天津竹内装璜有限公司 | A kind of middle bundle device of cosmetics accommodating container |
| CN210300834U (en) * | 2019-05-30 | 2020-04-14 | 江苏医药职业学院 | Hemiplegia patient nurses with supplementary device of going to lavatory of adjustable height |
| CN210622144U (en) * | 2019-06-21 | 2020-05-26 | 湘潭医卫职业技术学院 | Multifunctional slide rail type stair railing |
| CN110604378A (en) * | 2019-10-11 | 2019-12-24 | 衢州学院 | Multifunctional walking stick capable of assisting in going upstairs |
| CN211703767U (en) * | 2020-01-06 | 2020-10-20 | 宁波金雨科技实业有限公司 | Oil-free and glue-free environment-friendly middle bundle core structure |
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Application publication date: 20210525 |