A stand assist folding lift chair

Abstract

The application discloses a standing-up assisting folding lifting chair, which comprises a base, a seat support provided with a seat, a back support provided with a back, a rear end of the back support being hinged to a rear end of the seat support, a back limiting piece being arranged at the rear end of the seat support, a front connecting rod support and a rear connecting rod support, the front connecting rod support and the rear connecting rod support and the base and the seat support together forming a parallel four-bar linkage mechanism, the parallel four-bar linkage mechanism enabling the seat support to keep a flat posture during lifting, a lifting driving mechanism for driving the parallel four-bar linkage mechanism to move, and enabling the front connecting rod support and the rear connecting rod support to swing upward synchronously relative to the base to lift the seat support and the seat, or enabling the front connecting rod support and the rear connecting rod support to swing downward synchronously relative to the base to drive the seat support and the seat to descend and fold on the base. The application has the advantages of compact structure and high safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of assistive devices for the elderly, specifically to a folding and adjustable chair for assisting elderly people who have fallen to get up. Background Technology

[0002] As people age, their physical functions gradually decline, with a significant reduction in muscle strength and balance. Therefore, accidental falls among the elderly are common in hospitals, nursing homes, community rehabilitation centers, and at home.

[0003] Once a fall occurs, some elderly people are unable to stand up again on their own, especially those who are overweight, have difficulty moving their limbs, or have limb disabilities. In such cases, they must rely on the assistance of medical staff, caregivers, or family members.

[0004] However, for elderly people who have fallen and are heavier, it is difficult for medical staff, caregivers, or family members (especially women) with less strength to help them up from the ground to a standing position smoothly and safely. If the operation is not done properly, it may not only cause secondary injury to the elderly, but also cause injury to the rescuer themselves due to improper force during the process of helping them up.

[0005] To overcome the many shortcomings of manual assistance, some lifting chairs have appeared on the market to help the elderly get up. These devices provide support and assistance to elderly people who have fallen through their legs through a mechanical lifting structure, thus replacing manual assistance to some extent. For example, the "lifting folding chair" disclosed in utility model patent application number 202422442142.5.

[0006] However, existing adjustable chair devices still have the following drawbacks: (1) The product is too large in size after being folded and stored, and still requires a lot of storage space for daily storage, which is not conducive to the neat storage in limited spaces such as hospital wards, nursing home rooms, and homes.

[0007] (2) When the seat is unfolded and flattened, the seat surface for elderly people to sit on has no support underneath, which makes it less safe to use. Summary of the Invention

[0008] The purpose of this invention is to provide a folding and height-adjustable chair that assists in standing up, making it more compact and space-saving when stored, while also providing higher safety and reliability during use.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a folding and height-adjustable chair for assisting in standing up, comprising, Base; A seat support is located above the base, on which a seat for people to sit is installed; A backrest support on which a backrest is mounted, the lower end of which is hinged to the rear end of a seat support. The backrest support can be flipped upward relative to the seat support to an unfolded position where the backrest can be leaned against, or it can be flipped downward relative to the seat support to a folded position where it is folded together with the backrest on the seat. The backrest limiting component is installed at the rear end of the seat support and is used to limit the flipping of the backrest support. When the backrest support flips upward relative to the seat support and abuts against the backrest limiting component, the backrest support is in the unfolded position. The front and rear linkages are parallel and of equal length. The upper end of the front linkage is hinged to the front of the seat support and the lower end is hinged to the front of the base. The upper end of the rear linkage is hinged to the rear of the seat support and the lower end is hinged to the rear of the base. The front and rear linkages, together with the base and seat support, form a parallel four-bar linkage mechanism, which enables the seat support to maintain a flat position during lifting and lowering. The lifting drive mechanism is used to drive the parallel four-bar linkage to move, so that the front linkage and the rear linkage can swing upward synchronously relative to the base to lift the seat support and the seat, or to swing downward synchronously relative to the base to drive the seat support and the seat to descend and retract together to the base.

[0010] Furthermore, in the aforementioned folding and height-adjustable chair for assisting standing up, a locking mechanism is provided on the seat support to lock the backrest support in its unfolded position. The structure of the locking mechanism is as follows: The lower part of the backrest support has a limiting part, and a locking hole is provided in the limiting part; A mounting section is provided at the rear of the seat support. A through hole with a diameter matching the locking hole is provided in the mounting section. The through hole is positioned so that when the backrest support is in the unfolded position, it aligns perfectly with and connects to the corresponding locking hole of the backrest support. A positioning tube is fixed at the through hole of the mounting section. One end of the positioning tube faces the through hole, and the other end has a positioning shoulder protruding inward from the inner wall of the tube. A positioning pin, which can be inserted into the locking hole, slides through the positioning tube. The outer diameter of the positioning pin forms a stepped surface. A spring is also provided inside the positioning tube. One end of the spring abuts against the stepped surface of the positioning pin, and the other end abuts against the positioning shoulder of the positioning tube. Under the elastic force of the spring, the positioning pin always tends to insert into the locking hole through the through hole along the positioning tube. When the positioning pin is inserted into the locking hole, the backrest support is locked in the unfolded position. When the positioning pin is disengaged from the locking hole by external force overcoming the spring force, the backrest support can be freely rotated.

[0011] Furthermore, in the aforementioned folding and height-adjustable chair for assisting standing up, the locking mechanism is specifically configured as follows: The backrest support includes two side rods symmetrically arranged on the left and right. A pair of side plates are installed on the left and right sides of the rear of the seat support. A mounting slot is formed between each pair of side plates. The two side rods of the backrest support are inserted into the mounting slots on the corresponding sides and are hinged to the corresponding pair of side plates through a coaxial pivot, thereby making the backrest support hinged to the seat support. The upper rear side of each pair of side panels is connected by a limiting plate, which constitutes a backrest limiting component. When the backrest support is flipped upward relative to the seat support until the two side rods abut against the corresponding limiting plate, the backrest support is in the unfolded position. The lower part of each side rod constitutes the limiting part of the locking mechanism, and a locking hole is provided on the limiting part of each side rod. The lower part of the inner side plate in each pair of side plates constitutes the mounting part of the locking mechanism. Each mounting part corresponds to each limiting part. Each mounting part has a through hole that matches the locking hole on the corresponding limiting part. When the backrest support is in the unfolded position, the through hole is aligned with and connected to the corresponding locking hole. A positioning tube is fixed at the through hole of each of the two mounting parts. The two positioning tubes are opposite to each other and coaxially arranged. One end of each positioning tube is aligned with the corresponding through hole, and the other end is provided with a positioning shoulder that protrudes inward from the inner tube wall. A positioning pin that can be adapted to be inserted into the corresponding locking hole is slidably inserted in each positioning tube. A pull rope is connected between the two positioning pins. The outer diameter of each positioning pin forms a stepped surface. A spring is also provided inside each positioning tube. One end of each spring abuts against the stepped surface of the corresponding positioning pin, and the other end abuts against the positioning shoulder of the corresponding positioning tube. Under the elastic force of the spring, the positioning pin always tends to be inserted into the corresponding locking hole through the through hole of the corresponding positioning tube. When the two positioning pins are inserted into the corresponding locking holes, the backrest bracket is locked in the unfolded position. When the two positioning pins are driven by the pull rope to overcome the corresponding spring force and disengage from the corresponding locking holes, the backrest bracket can be freely flipped.

[0012] Furthermore, in the aforementioned folding and height-adjustable chair for assisting standing up, the lifting drive mechanism includes an electric push rod, the housing of which is hinged to the lower part of the front linkage or the lower part of the rear linkage, and the push rod end of which is hinged to the base.

[0013] Furthermore, in the aforementioned folding and height-adjustable chair for assisting standing up, several casters with brakes are provided at the bottom of the base.

[0014] Furthermore, in the aforementioned folding and height-adjustable chair for assisting in getting up, two foldable handles are provided at the rear of the backrest support to facilitate pushing the folding and height-adjustable chair.

[0015] Furthermore, in the aforementioned folding and height-adjustable chair for assisting in getting up, several safety belts are also provided on the backrest support.

[0016] The beneficial effects of implementing the above technical solution are as follows: (1) When storing, the backrest support can be flipped down and folded close to the seat, and the foldable handle can be folded close to the backrest support. At the same time, the seat support and seat can be lowered and folded close to the base by the lifting drive mechanism and the parallel four-bar linkage mechanism. At this time, the lifting drive mechanism and the parallel four-bar linkage mechanism are also stored between the seat support and the base, so that the folding lifting chair is flat in the storage state, with a compact overall structure and small space occupation, making it easy to store and transport in places with limited space such as hospital wards, nursing home rooms, and homes.

[0017] (2) The front linkage, rear linkage, base and seat support together form a parallel four-bar linkage mechanism to ensure that the seat remains flat during the lifting process, preventing the elderly from slipping and getting injured during the lifting process; at the same time, during the lifting process, there is always a support structure composed of linkage and base under the seat, making the ride safer and more reliable.

[0018] (3) The locking mechanism adopts a structure in which the spring drives the positioning pin to automatically insert into the locking hole. When the backrest bracket flips up to the unfolded position, the positioning pin remains locked in the locking hole under the action of the spring force, ensuring that the backrest is stable and reliable during use. In addition, there is a pull rope between the two positioning pins. Pulling the pull rope can simultaneously release the locking of the left and right positioning pins on the backrest bracket, making the operation more convenient.

[0019] (4) The electric push rod drives the parallel four-bar linkage mechanism to lift and lower, which can smoothly lift the elderly sitting on the chair from a low position to a sitting height. The caregiver can then assist the elderly to stand up from a sitting position. The operation is more convenient and the assistance to stand up is less strenuous, which greatly reduces the physical exertion of caregivers and the risk of back injury, and greatly reduces the secondary injury that manual assistance may cause to the elderly.

[0020] (5) The base is equipped with casters with brakes at the bottom and a foldable handle at the back of the backrest, which is convenient for single-person pushing and positioning; the backrest support is also equipped with a safety belt, which can assist in fixing the elderly during the lifting process and further improve the safety of use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the use state of the folding and lifting chair with backrest extended and seat in a high position as described in this invention.

[0022] Figure 2 for Figure 1 The right view.

[0023] Figure 3 This is a three-dimensional structural diagram of the folding and lifting chair with backrest extended and seat in a high position, as described in this invention.

[0024] Figure 4 This is a three-dimensional structural diagram of the folding and lifting chair for assisting standing up, as described in this invention, with the backrest unfolded and the seat in a high position, from another perspective.

[0025] Figure 5 This is a schematic diagram of the use state of the folding and lifting chair with backrest extended and seat in a low position as described in this invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the folding and lifting chair for assisting standing up, as described in this invention, with the backrest extended and the seat in a low position, from one perspective.

[0027] Figure 7 This is a three-dimensional structural diagram of the folding and lifting chair for assisting standing up, as described in this invention, with the backrest unfolded and the seat in a low position, from another perspective.

[0028] Figure 8 This is a schematic diagram of the structure of the folding and height-adjustable chair for assisting standing up, as described in this invention, in its folded and stowed state.

[0029] Figure 9 This is a three-dimensional structural diagram of the folding and height-adjustable chair for assisting standing up, as described in this invention, in a folded and stored state, from one perspective.

[0030] Figure 10 for Figure 9 An enlarged schematic diagram of part A shown in the figure.

[0031] Figure 11 This is a three-dimensional structural diagram of the folding and height-adjustable chair for assisting standing up, as described in this invention, in its folded and stowed state, from another perspective.

[0032] Figure 12 This is a schematic diagram showing the backrest and backrest support in their unfolded position.

[0033] Figure 13 for Figure 12 The diagram shows a structural schematic of the BB cross-section.

[0034] Figure 14 for Figure 13 An enlarged schematic diagram of part C shown in the figure.

[0035] Figure 15 This is a three-dimensional structural diagram of the backrest and backrest support in their unfolded position.

[0036] Figure 16 This is a schematic diagram showing the front and rear linkage frames in use when the seat support and seat are raised. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] For ease of description, let's use Figure 1 The right-hand direction is defined as "front". Figure 1 The left-hand direction is defined as "back". Figure 1 "Above" is defined as "above". Figure 1 The term "down" is defined as "below," and a coordinate system is established based on this to determine the directions "left," "right," "front," "back," "up," and "down." All directional terms in this invention involving the directions "front," "back," "left," "right," "up," and "down" are defined according to this direction definition.

[0039] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 As shown, the aforementioned folding and height-adjustable chair for assisting standing up includes, Base 1; A seat support 2 is located above the base 1, and a seat 3 for people to sit on is installed on it; A backrest support 4 is provided, on which a backrest 5 is mounted. The lower end of the backrest support 4 is hinged to the rear end of the seat support 2. The backrest support 4 can be flipped upward relative to the seat support 2 to allow the backrest 5 to be extended so that a person can lean against it, or it can be flipped downward relative to the seat support 2 to be folded up close to the seat 3 together with the backrest 5. The backrest limiting component is installed at the rear end of the seat support 2 and is used to limit the flipping of the backrest support 4. When the backrest support 4 flips upward relative to the seat support 2 and abuts against the backrest limiting component, the backrest support 4 is in the unfolded position. The front linkage 7 and the rear linkage 8 are provided. The upper end of the front linkage 7 is hinged to the front part of the seat support 2 via the upper front pivot 71, and the lower end of the front linkage 7 is hinged to the front part of the base 1 via the lower front pivot 72. In this embodiment, the front linkage 7 is composed of two parallel and equal-length front linkages. The upper end of each front linkage is hinged to the front part of the seat support 2 via the upper front pivot 71, and the lower end of each front linkage is hinged to the front part of the base 1 via the lower front pivot 72. The upper end of the rear connecting rod frame 8 is hinged to the rear of the seat support 2 via the upper rear pivot 81, and the lower end of the rear connecting rod frame 8 is hinged to the rear of the base 1 via the lower rear pivot 82. In this embodiment, the rear connecting rod frame 8 consists of two parallel and equal-length rear connecting rods. The upper end of each rear connecting rod is hinged to the rear of the seat support 2 via the upper rear pivot 81, and the lower end of each rear connecting rod is hinged to the rear of the base 1 via the lower rear pivot 82. The front connecting rod is parallel and equal in length to the rear connecting rod. The distance between the two rear connecting rods is smaller than the distance between the two front connecting rods, so that the two rear connecting rods can be folded down around the corresponding pivot and stored in the area between the two front connecting rods. This makes the folding and height-adjustable chair more compact in the storage state, further reducing the storage space and making it easier to store.

[0041] The front linkage 7, the rear linkage 8, the base 1, and the seat support 2 together form a parallel four-bar linkage mechanism, which enables the seat support to maintain a flat position during the lifting and lowering process. The lifting drive mechanism is used to drive the parallel four-bar linkage to move, so that the front linkage 7 and the rear linkage 8 can swing upward synchronously relative to the base 1 to lift the seat support 2 and the seat 3, or to swing downward synchronously relative to the base 1 to drive the seat support 2 and the seat 3 to descend together and close to the base 1; through the parallel four-bar linkage, it is ensured that the seat 3 is always in a flat position that can be sat on during the lifting process.

[0042] In this embodiment, a locking mechanism is provided on the seat support 2 to lock the backrest support 4 in its unfolded position, such as... Figure 10 , Figure 11 , Figure 13 , Figure 14 As shown, the structure of the locking mechanism is as follows: The lower part of the backrest bracket 4 has a limiting part 41, and a locking hole 42 is provided in the limiting part 41; A mounting part 211 is provided at the rear of the seat support 2. The mounting part 211 has a through hole whose diameter matches that of the locking hole 42. The through hole is positioned such that when the backrest support 4 is in the unfolded position, the through hole is aligned with and connected to the corresponding locking hole 42 of the backrest support 4. A positioning tube 9 is fixed at the through hole of the mounting part 211. One end of the positioning tube 9 faces the through hole, and the other end has a positioning shoulder 10 protruding inward from the inner wall of the tube. A positioning pin that can be inserted into the locking hole 42 slides through the positioning tube 9. The positioning pin 11 has an outer diameter variation forming a stepped surface. A spring 12 is also provided inside the positioning tube 9. One end of the spring 12 abuts against the stepped surface of the positioning pin 11, and the other end abuts against the positioning shoulder 10 of the positioning tube 9. Under the elastic force of the spring 12, the positioning pin 11 always tends to be inserted into the locking hole 42 through the through hole of the positioning tube 9. When the positioning pin 11 is inserted into the locking hole 42, the backrest bracket 4 is locked in the unfolded position. When the positioning pin 11 is disengaged from the locking hole 42 by external force overcoming the elastic force of the spring 12, the backrest bracket 4 can be freely rotated.

[0043] In this embodiment, as Figure 10 , Figure 13 , Figure 14 As shown, the locking mechanism is specifically configured as follows: The backrest support 4 includes two side rods 43 arranged symmetrically on the left and right. A pair of side plates 212 are respectively installed on the left and right sides of the rear of the seat support 2. A mounting slot is formed between each pair of side plates 212. The two side rods 43 of the backrest support 4 are respectively inserted into the mounting slots on the corresponding sides and are hinged to the corresponding pair of side plates 212 through a coaxial pivot 213, so that the backrest support 4 is hinged to the seat support 2. The upper rear side of each pair of side panels 212 is connected by a limiting plate 6, which constitutes a backrest limiting component. When the backrest support 4 is flipped upward relative to the seat support 2 until the two side rods 43 abut against the corresponding limiting plate 6, the backrest support 4 is in the unfolded position. The lower part of each side rod 43 constitutes the limiting part 41 of the locking mechanism, and a locking hole 42 is provided on the limiting part 41 of each side rod 43. The lower part of the inner side plate in each pair of side plates 212 constitutes the mounting part 211 of the locking mechanism. Each mounting part 211 corresponds to each limiting part 41. Each mounting part 211 has a through hole that matches the locking hole 42 on the corresponding limiting part 41. When the backrest bracket 4 is in the unfolded position, the through hole is aligned with and connected to the corresponding locking hole 42. A positioning tube 9 is fixed at the through hole of each of the two mounting parts 211. The two positioning tubes 9 are opposite to each other and coaxially arranged. One end of each positioning tube 9 is aligned with the corresponding through hole, and the other end is provided with a positioning shoulder 10 that protrudes inward from the inner tube wall. A positioning pin 11 that can be adapted to be inserted into the corresponding locking hole 42 is slidably passed through each positioning tube 9. A pull rope 13 is connected between the two positioning pins 11. The outer diameter of each positioning pin 11 forms a stepped surface. A spring 12 is also provided in each positioning tube 9. One end of each spring 12 abuts against the stepped surface of the corresponding positioning pin 11, and the other end abuts against the positioning shoulder 10 of the corresponding positioning tube 9. Under the elastic force of the spring 12, the positioning pin 11 always tends to be inserted into the corresponding locking hole 42 through the through hole of the corresponding positioning tube. When the two positioning pins 11 are inserted into the corresponding locking holes 42 respectively, the backrest bracket 4 is locked in the unfolded position. When the two positioning pins 11 are driven by the pull rope 13 to overcome the elastic force of the corresponding spring 12 and disengage from the corresponding locking holes 42, the backrest bracket 4 can be freely flipped. In this way, when the unfolded folding chair needs to be stored, pulling the pull rope 13 can unlock both sides of the backrest support at the same time, making the operation more convenient; and when the folding chair is in the unfolded position, the backrest support can be locked at the same time by the positioning pins, which can further improve the stability of the backrest support.

[0044] In this embodiment, the lifting drive mechanism includes an electric push rod. The housing 15 of the electric push rod is hinged to the lower part of the front linkage 7 or the lower part of the rear linkage 8, and the end of the push rod 14 of the electric push rod is hinged to the base 1. Specifically, in this embodiment, the housing 15 of the electric push rod is hinged to the lower part of the rear linkage 8 through the rear hinge shaft 16, and the end of the push rod 14 of the electric push rod is hinged to the base 1 through the front hinge shaft 17.

[0045] In this embodiment, several casters 18 with brakes are provided at the bottom of the base 1 to facilitate the movement of the folding chair; and two foldable handles 19 are provided at the rear of the backrest support 4 to facilitate pushing the folding chair; the specific installation structure of the foldable handles 19 on the backrest support 4 is as follows: the handles 19 are hinged to the rear of the backrest support 4 via pins 191, and a stop 192 is provided on the handles 19. After the backrest support 4 is flipped upward relative to the seat support 4 into an unfolded position, when the handles 19 are flipped outward relative to the backrest support 4 around the pins 191 until the stop 192 abuts against the backrest support 4, the handles 19 are in a flat position, making it easy for caregivers to push the chair; when it needs to be folded, simply rotate the handles 19 around the pins 191 toward the backrest support 4 until they are close to the backrest support 4. Several safety belts (not shown in the figure) are also provided on the backrest support 4.

[0046] The working principle of this invention is as follows: In its initial state, the folding chair is in a folded and stowed position: at this time, the backrest support 4 flips down and closes to the seat surface 3, the parallel four-bar linkage is in a retracted state, and the seat support 2 and seat surface 3 descend and close to the base 1. The overall structure is compact and easy to store and transport.

[0047] When an elderly person who has fallen needs assistance to get up, caregivers should first place a folding, adjustable chair in its folded, stowed position behind the elderly person.

[0048] Next, the nurse pulls the pull rope 13, causing the positioning pins 11 on both sides to retract into the corresponding positioning tubes 9 at the same time, so that the positioning pins 11 will not prevent the backrest bracket 4 from flipping upward and abutting against the limiting plate 6; and the nurse flips the backrest bracket 4 upward, so that it rotates upward relative to the seat bracket 2 around the pivot 213 until the two side rods 43 of the backrest bracket 4 simultaneously abut against the corresponding limiting plate 6. At this time, the backrest bracket 4 is in the unfolded position, and the backrest 5 on the backrest bracket 4 can be leaned against.

[0049] Next, release the pull rope 13. At this time, the positioning pins 11 in each positioning tube 9 will pass through the through hole and be inserted into the locking hole 42 at the bottom of the corresponding side rod 43 under the elastic force of the corresponding spring 12, thereby locking the backrest bracket 4 in the unfolded position and ensuring that the backrest 5 is stable and reliable during use. Then unfold the foldable handles 19 on both sides of the back of the backrest bracket 4.

[0050] Then, the caregiver moves the elderly person sitting on the ground onto the seat 3 of the folding and lifting chair, that is, makes the elderly person sit on the seat 3 of the folding and lifting chair; after the elderly person leans against the backrest 5, the safety belt is fastened. In actual operation, it is also possible not to fasten the safety belt.

[0051] Next, the caregiver controls the electric push rod 14 to extend outward via the controller, driving the rear linkage 8 and the front linkage 7 to swing synchronously upward relative to the base 1 around the corresponding pivot, thereby gradually raising the seat support 2 and seat 3 from a low position while keeping them flat. This gradually and smoothly raises the buttocks of the elderly person sitting on the seat 3 from a low position. When the seat support 2 and seat 3 rise from a low position to a high position while keeping them flat, the elderly person is in a sitting position. Then, the electric push rod 14 is stopped, and the caregiver unbuckles the seat belt and assists the elderly person to stand up from the sitting position.

[0052] After use, the caregiver pulls the two positioning pins 11 simultaneously with the pull rope 13, causing them to overcome the elastic force of the spring 12 and disengage from the locking hole 42, thereby unlocking the backrest support 4. Then, the backrest support 4 is flipped down and folded close to the seat surface 3, and the two foldable handles 19 are folded and folded close to the backrest support 4. Next, the controller controls the push rod 14 of the electric push rod to retract, causing the front linkage frame 7 and the rear linkage frame 8 to swing down synchronously relative to the base 1 around the corresponding pivot, so that the seat support 2 and the seat surface 3 gradually descend and fold close to the base 1, thereby completing the folding and storage of the folding and lifting chair.

[0053] The advantages of this invention are as follows: (1) When storing, the backrest support can be flipped down and folded close to the seat, and the foldable handle can be folded close to the backrest support. At the same time, the seat support and seat can be lowered and folded close to the base by the lifting drive mechanism and the parallel four-bar linkage mechanism. At this time, the lifting drive mechanism and the parallel four-bar linkage mechanism are also stored between the seat support and the base, so that the folding lifting chair is flat in the storage state, with a compact overall structure and small space occupation, making it easy to store and transport in places with limited space such as hospital wards, nursing home rooms, and homes.

[0054] (2) The front linkage, rear linkage, base and seat support together form a parallel four-bar linkage mechanism to ensure that the seat remains flat during the lifting process, preventing the elderly from slipping and getting injured during the lifting process; at the same time, during the lifting process, there is always a support structure composed of linkage and base under the seat, making the ride safer and more reliable.

[0055] (3) The locking mechanism adopts a structure in which the spring drives the positioning pin to automatically insert into the locking hole. When the backrest bracket flips up to the unfolded position, the positioning pin remains locked in the locking hole under the action of the spring force, ensuring that the backrest is stable and reliable during use. In addition, there is a pull rope between the two positioning pins. Pulling the pull rope can simultaneously release the locking of the left and right positioning pins on the backrest bracket, making the operation more convenient.

[0056] (4) The electric push rod drives the parallel four-bar linkage mechanism to lift and lower, which can smoothly lift the elderly sitting on the chair from a low position to a sitting height. The caregiver can then assist the elderly to stand up from a sitting position. The operation is more convenient and the assistance to stand up is less strenuous, which greatly reduces the physical exertion of caregivers and the risk of back injury, and greatly reduces the secondary injury that manual assistance may cause to the elderly.

[0057] (5) The base is equipped with casters with brakes at the bottom and a foldable handle at the back of the backrest, which is convenient for single-person pushing and positioning; the backrest support is also equipped with a safety belt, which can assist in fixing the elderly during the lifting process and further improve the safety of use.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A folding and height-adjustable chair for assisting in getting up, characterized in that: include, Base; A seat support is located above the base, on which a seat for people to sit is installed; A backrest support on which a backrest is mounted, the lower end of which is hinged to the rear end of a seat support. The backrest support can be flipped upward relative to the seat support to an unfolded position where the backrest can be leaned against, or it can be flipped downward relative to the seat support to a folded position where it is folded together with the backrest on the seat. The backrest limiting component is installed at the rear end of the seat support and is used to limit the flipping of the backrest support. When the backrest support flips upward relative to the seat support and abuts against the backrest limiting component, the backrest support is in the unfolded position. The front and rear linkages are parallel and of equal length. The upper end of the front linkage is hinged to the front of the seat support and the lower end is hinged to the front of the base. The upper end of the rear linkage is hinged to the rear of the seat support and the lower end is hinged to the rear of the base. The front and rear linkages, together with the base and seat support, form a parallel four-bar linkage mechanism, which enables the seat support to maintain a flat position during lifting and lowering. The lifting drive mechanism is used to drive the parallel four-bar linkage to move, so that the front linkage and the rear linkage can swing upward synchronously relative to the base to lift the seat support and the seat, or to swing downward synchronously relative to the base to drive the seat support and the seat to descend and retract together to the base.

2. The folding and height-adjustable chair for assisting standing up according to claim 1, characterized in that: A locking mechanism is provided on the seat support to lock the backrest support in its unfolded position. The structure of the locking mechanism is as follows: The lower part of the backrest support has a limiting part, and a locking hole is provided in the limiting part; A mounting section is provided at the rear of the seat support. A through hole with a diameter matching the locking hole is provided in the mounting section. The through hole is positioned so that when the backrest support is in the unfolded position, it aligns perfectly with and connects to the corresponding locking hole of the backrest support. A positioning tube is fixed at the through hole of the mounting section. One end of the positioning tube faces the through hole, and the other end has a positioning shoulder protruding inward from the inner wall of the tube. A positioning pin, which can be inserted into the locking hole, slides through the positioning tube. The outer diameter of the positioning pin forms a stepped surface. A spring is also provided inside the positioning tube. One end of the spring abuts against the stepped surface of the positioning pin, and the other end abuts against the positioning shoulder of the positioning tube. Under the elastic force of the spring, the positioning pin always tends to insert into the locking hole through the through hole along the positioning tube. When the positioning pin is inserted into the locking hole, the backrest support is locked in the unfolded position. When the positioning pin is disengaged from the locking hole by external force overcoming the spring force, the backrest support can be freely rotated.

3. A folding and height-adjustable chair for assisting in standing up according to claim 2, characterized in that: The locking mechanism is specifically configured as follows: The backrest support includes two side rods symmetrically arranged on the left and right. A pair of side plates are installed on the left and right sides of the rear of the seat support. A mounting slot is formed between each pair of side plates. The two side rods of the backrest support are inserted into the mounting slots on the corresponding sides and are hinged to the corresponding pair of side plates through a coaxial pivot, thereby making the backrest support hinged to the seat support. The upper rear side of each pair of side panels is connected by a limiting plate, which constitutes a backrest limiting component. When the backrest support is flipped upward relative to the seat support until the two side rods abut against the corresponding limiting plate, the backrest support is in the unfolded position. The lower part of each side rod constitutes the limiting part of the locking mechanism, and a locking hole is provided on the limiting part of each side rod. The lower part of the inner side plate in each pair of side plates constitutes the mounting part of the locking mechanism. Each mounting part corresponds to each limiting part. Each mounting part has a through hole that matches the locking hole on the corresponding limiting part. When the backrest support is in the unfolded position, the through hole is aligned with and connected to the corresponding locking hole. A positioning tube is fixed at the through hole of each of the two mounting parts. The two positioning tubes are opposite to each other and coaxially arranged. One end of each positioning tube is aligned with the corresponding through hole, and the other end is provided with a positioning shoulder that protrudes inward from the inner tube wall. A positioning pin that can be adapted to be inserted into the corresponding locking hole is slidably inserted in each positioning tube. A pull rope is connected between the two positioning pins. The outer diameter of each positioning pin forms a stepped surface. A spring is also provided inside each positioning tube. One end of each spring abuts against the stepped surface of the corresponding positioning pin, and the other end abuts against the positioning shoulder of the corresponding positioning tube. Under the elastic force of the spring, the positioning pin always tends to be inserted into the corresponding locking hole through the through hole of the corresponding positioning tube. When the two positioning pins are inserted into the corresponding locking holes, the backrest bracket is locked in the unfolded position. When the two positioning pins are driven by the pull rope to overcome the corresponding spring force and disengage from the corresponding locking holes, the backrest bracket can be freely flipped.

4. The folding and height-adjustable chair for assisting standing up according to claim 1, characterized in that: The lifting drive mechanism includes an electric push rod, the housing of which is hinged to the lower part of the front linkage or the lower part of the rear linkage, and the push rod end of which is hinged to the base.

5. A folding and height-adjustable chair for assisting in standing up, as described in claim 1, 2, 3, or 4, characterized in that: Several casters with brakes are installed at the bottom of the base.

6. A folding and height-adjustable chair for assisting in standing up according to claim 5, characterized in that: Two foldable handles are provided at the rear of the backrest support to facilitate pushing the folding and height-adjustable chair.

7. A folding and height-adjustable chair for assisting in standing up according to claim 1, characterized in that: Several safety belts are also installed on the backrest support.

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