CN214760138U

CN214760138U - Lifting chair

Info

Publication number: CN214760138U
Application number: CN202022953940.6U
Authority: CN
Inventors: 朱小明; 韩伟
Original assignee: Guangzhou College of South China University of Technology
Current assignee: Guangzhou College of South China University of Technology
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-11-19
Anticipated expiration: 2030-12-11

Abstract

The utility model provides a lifting chair, which comprises chair legs, a chair frame, a bearing mechanism and a clamping piece; the chair legs are connected with the chair frame and positioned below the chair frame; the supporting mechanism is arranged on the chair frame; the clamping piece is connected with the chair frame and the supporting mechanism; more than one first clamping groove and connecting groove are uniformly distributed on the longitudinal support; the connecting device is provided with a first connecting piece, a second connecting piece and a second clamping groove; the first connecting piece and the second connecting piece are matched with connecting grooves with different heights arranged on the longitudinal support; the height of the connecting device is adjusted on the bearing mechanism; the connecting groove is obliquely arranged, so that the first connecting piece and the second connecting piece which are arranged on the connecting groove from high to low; the first connecting piece and the second connecting piece are not easy to slide out of the connecting groove, and the connection is stable; the second clamping groove and the first clamping groove are connected through the clamping piece; further enhancing the connecting effect between the supporting mechanism and the chair frame. Thus, the stability is good.

Description

Lifting chair

Technical Field

The utility model relates to a height-adjustable chair, concretely relates to lift chair.

Background

The height of the existing chair is generally adjusted by extending the length of chair legs; but the support stability of such chairs is not ideal; in chinese application No. 201822093140.4; publication No. 2019.9.17 discloses a liftable chair for a shower room; including two slide rails, the back of the chair and seat support, the vertical mounted position that is fixed in of slide rail, the vertical slide rail groove that is provided with two and slide rail shape correspondences in the back of the chair, slide rail groove activity joint in slide rail, the upper end swing joint of the back of the chair has two first block portions, the lower extreme swing joint seat support of the back of the chair, one side swing joint that the back of the chair was kept away from to the seat support has two chair legs, the tail end of chair leg is provided with second block portion, second block portion is unanimous with first block portion form size, the slide rail is provided with the fixed slot that vertical direction was arranged along a plurality of, second block portion and the equal block of first block portion in fixed slot.

The scheme is that the height is adjusted by inserting the first clamping part and the second clamping part into fixing grooves with different heights; but the first clamping part and the second clamping part are movably connected with the fixed groove; according to the scheme, the first clamping part and the second clamping part are inserted into the fixed groove, so that the first clamping part and the second clamping part are matched with the fixed groove, and the stability is poor; the first clamping part and the second clamping part are easy to slide out of the fixing groove; this is not safe to use.

Disclosure of Invention

The utility model provides a lifting chair with safe use and good stability.

In order to achieve the above purpose, the technical scheme of the utility model is that: a lifting chair comprises chair legs, a chair frame, a bearing mechanism and a clamping piece; the chair legs are connected with the chair frame and positioned below the chair frame; the supporting mechanism is arranged on the chair frame; the clamping piece is connected with the chair frame and the supporting mechanism;

the chair frame comprises a longitudinal bracket, a first transverse bracket and a second transverse bracket; the first transverse bracket and the second transverse bracket are arranged in parallel; two longitudinal supports are arranged; the two longitudinal brackets are symmetrically arranged relative to the second transverse bracket; the top end of the first transverse bracket is connected with one end of the longitudinal bracket; the second transverse bracket is close to the other end of the longitudinal bracket and is connected between the two longitudinal brackets; the longitudinal support is provided with more than one connecting groove and more than one first clamping groove; the adjacent connecting grooves and the adjacent first clamping grooves are uniformly distributed on the longitudinal bracket,

the longitudinal support comprises a first longitudinal end face, a second longitudinal end face, a third longitudinal end face and a fourth longitudinal end face; the first longitudinal end face is arranged on one side, close to the bearing mechanism, of the longitudinal support; the second longitudinal end surface is arranged on one side of the longitudinal support far away from the bearing mechanism; the connecting groove is concavely formed from the first longitudinal end surface to the second longitudinal end surface; the connecting groove is obliquely arranged from the high side to the low side from the first longitudinal end surface to the second longitudinal end surface; the fourth longitudinal end surface is arranged on one side, close to the second transverse bracket, of the longitudinal bracket; the third longitudinal end surface is arranged on one side of the longitudinal support far away from the second transverse support; the first clamping groove is concavely formed from the third longitudinal end surface to the fourth longitudinal end surface;

the supporting mechanism comprises a connecting device; the connecting device comprises a longitudinal connecting support plate and a transverse connecting support plate; one end of the longitudinal connecting device is connected with one end of the transverse connecting support plate; the longitudinal connecting device is provided with a connecting part outwards in a protruding way; the connecting part is provided with a first connecting piece, a second connecting piece and a second clamping groove; the first connecting piece and the second connecting piece are formed in a protruding mode from the end face, close to the chair frame, of the connecting part to the direction of the chair frame in an inclined mode; the inclination directions of the first connecting piece and the second connecting piece are the same as the connecting groove; the first connecting piece and the second connecting piece are matched with the connecting groove; the second clamping groove is formed by sinking the connecting part from one surface far away from the longitudinal connecting device to one surface close to the longitudinal connecting device; the second clamping groove is communicated with the first clamping groove; the screens piece is connected second screens groove and first screens groove.

In the arrangement, more than one first clamping groove and connecting groove are uniformly distributed on the longitudinal support; the connecting device is provided with a first connecting piece, a second connecting piece and a second clamping groove; the first connecting piece and the second connecting piece are matched with connecting grooves with different heights arranged on the longitudinal support; the height of the connecting device is adjusted on the bearing mechanism; the connecting groove is obliquely arranged, and the first longitudinal end surface is obliquely arranged from high to low towards the second longitudinal end surface in the oblique direction; the first connecting piece and the second connecting piece which are arranged on the connecting groove from high to low; the first connecting piece and the second connecting piece are not easy to slide out of the connecting groove; the first connecting piece, the second connecting piece and the connecting groove are connected stably; so that the connection between the supporting mechanism and the chair frame is stable; the second clamping groove and the first clamping groove are connected through the clamping piece; further enhancing the connecting effect between the supporting mechanism and the chair frame. Thus, the stability is good.

Further, the supporting mechanism comprises a supporting device; more than one supporting device is arranged; the supporting device is connected with the bottom surface of the transverse connecting support plate; the supporting device comprises a supporting piece and a supporting clamping piece; the bearing connecting part extends towards the direction close to the first transverse bracket; the bearing connecting part is provided with a bearing connecting through hole; the first transverse bracket is provided with a first mounting part; the number of the first mounting parts is the same as that of the supporting devices; the bearing connecting part and the bearing clamping piece are arranged on the first mounting part; the bearing clamping piece is connected with the bearing connecting through hole.

The device is connected with the transverse connecting support plate through the supporting device; meanwhile, the supporting device is arranged on the chair frame; the supporting device can provide supporting force for the connecting device.

Further, the chair frame also comprises a third transverse bracket; the third transverse bracket is positioned above the first transverse bracket; and the third transverse bracket is connected between the two longitudinal brackets; the third transverse bracket is provided with a second mounting part; the number of the second mounting parts is the same as that of the supporting devices; the bearing connecting part and the bearing clamping piece are arranged on the second mounting part; the bearing clamping piece is connected with the bearing connecting through hole.

According to the arrangement, the third transverse bracket is arranged to be connected between the two longitudinal brackets, so that the stability is improved; meanwhile, a second mounting part is arranged on the third transverse bracket; the second mounting part is matched and connected with the supporting device; and because the third transverse bracket is positioned above the first transverse bracket; thus, when the connecting device needs to adjust the height on the chair frame; the supporting device can also be adjusted in height along with the connecting device.

Further, the first mounting part comprises a first mounting through groove, a first mounting through hole and a first splicing through groove; the first mounting through groove is formed in a concave mode in the direction away from the connecting device on the side face of the first transverse support; the first mounting through hole and the first inserting through groove are formed in a concave mode in the direction away from the second transverse support on the top face of the first transverse support; the first mounting through hole is arranged in parallel with the first inserting through groove; the first mounting through hole is positioned above the first splicing through groove, and the first mounting through groove is positioned between the first mounting through hole and the first splicing through groove; the first mounting through groove, the first mounting through hole and the first inserting through groove are communicated; the bearing connecting part is arranged on the first mounting through groove; the bearing fastener passes first installation through-hole, bearing connect the through-hole in proper order and installs on first grafting logical groove.

According to the arrangement, the bearing piece and the bearing clamping piece are connected with the first installation part, and the bearing clamping piece sequentially penetrates through the first installation through hole and the bearing connecting through hole to be installed in the first inserting through groove; thus, the supporting piece is fixed on the first mounting part through the supporting clamping piece; the supporting piece, the supporting clamping piece and the first transverse bracket do not need to be connected through bolts; the connecting structure is simple.

Further, the second mounting part comprises a second mounting through groove, a second mounting through hole and a second inserting through groove; the second mounting through groove is formed in a concave mode in the direction away from the connecting device on the side face of the third transverse support; the second mounting through hole and the second inserting through groove are formed in a concave mode in the direction away from the second transverse support on the top face of the third transverse support; the second mounting through hole is arranged in parallel with the second inserting through groove; the second mounting through hole is positioned above the second inserting through groove, and the second mounting through groove is positioned between the second mounting through hole and the second inserting through groove; the second mounting through groove, the second mounting through hole and the second inserting through groove are communicated; the bearing connecting part is arranged on the second mounting through groove; the bearing fastener passes second installation through-hole, bearing connect the through-hole in proper order and installs on the logical groove of second grafting.

According to the arrangement, the bearing piece and the bearing clamping piece are connected with the second installation part, and the bearing clamping piece sequentially penetrates through the second installation through hole and the bearing connecting through hole to be installed in the second inserting through groove; thus, the supporting piece is fixed on the second mounting part through the supporting clamping piece; the supporting piece, the supporting clamping piece and the second transverse bracket do not need to be connected through bolts; the connecting structure is simple.

Furthermore, the transverse connecting support plate is arranged from the end far away from the chair frame to the end close to the chair frame in an inclined mode from high to low.

In the arrangement, the transverse connecting support plate is obliquely arranged; when the chair is used, a user sitting on the transverse connecting support plate is not easy to slide out of the transverse connecting support plate; the use experience is good.

Further, the connecting device also comprises a flexible supporting part; the flexible supporting piece is arranged on the wall surfaces of the transverse connecting support plate and the longitudinal connecting support plate far away from the chair frame.

Above setting, through setting up flexible support piece, it is comfortable to use.

Furthermore, the chair leg comprises a first supporting leg, a second supporting leg and a third supporting leg; the first arm brace and the second arm brace are symmetrically arranged around the third arm brace; the first supporting leg and the second supporting leg extend towards the direction close to the bearing mechanism; the third supporting leg extends towards the direction far away from the supporting mechanism.

The first supporting leg, the second supporting leg and the third supporting leg which form a triangular structure are arranged; thus, the stability of the chair leg is good; thereby the chair legs have good supporting effect on the chair frame.

Drawings

Fig. 1 is a schematic perspective view of the present embodiment.

Fig. 2 is an exploded view of the present solution.

Fig. 3 is a side view of the connection device according to the present solution.

Fig. 4 is a side view of the chair frame in the present solution.

Fig. 5 is a plan view of the chair frame in the present embodiment.

Fig. 6 is a cross-sectional view a-a of fig. 5.

Fig. 7 is a side view of the present solution.

Fig. 8 is a practical state diagram after the height is adjusted according to the scheme.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-8; a lifting chair comprises chair legs 4, a chair frame 1, a supporting mechanism 2 and a clamping piece 3; the chair legs 4 are connected with the chair frame 1 and are positioned below the chair frame 1; the supporting mechanism 2 is arranged on the chair frame 1; the clamping piece 3 is connected with the chair frame 1 and the supporting mechanism 2.

The chair frame 1 comprises a longitudinal bracket 14, a first transverse bracket 11 and a second transverse bracket 12; the first transverse bracket 11 and the second transverse bracket 12 are arranged in parallel; the longitudinal supports 14 are provided in two; the two longitudinal supports 14 are symmetrically arranged with respect to the second transversal support 12; the top end of the first transverse bracket 11 is connected with one end of the longitudinal bracket 14; the second transverse bracket 12 is close to the other end of the longitudinal bracket 14 and is connected between the two longitudinal brackets 14; the longitudinal support 14 is provided with more than one connecting groove 141 and more than one first blocking groove 142; more than one connecting groove 141 and more than one first blocking groove 142 are uniformly distributed on the longitudinal support 14. In the present embodiment, there are three connecting grooves 141; two first locking grooves 142 are provided.

The longitudinal support 14 comprises a first 143, a second 144, a third 145 and a fourth 146 longitudinal end face; the first longitudinal end face 143 is arranged on the side of the longitudinal support 14 close to the supporting mechanism 2; the second longitudinal end face 144 is arranged on the side of the longitudinal support 14 facing away from the supporting mechanism 2; the connecting groove 141 is concavely formed from the first longitudinal end face 143 to the second longitudinal end face 144; the connecting groove 141 is arranged from the first longitudinal end face 143 to the second longitudinal end face 144 in an inclined manner from bottom to inside; the fourth longitudinal end surface 146 is arranged on the side of the longitudinal support 14 close to the second transverse support 12; the third longitudinal end 145 is disposed on the side of the longitudinal support 14 remote from the second transversal support 12; the first latching groove 142 is formed in a recessed manner from the third longitudinal end 145 to the fourth longitudinal end 146.

The supporting mechanism 2 comprises a connecting device 21; the connecting device 21 comprises a longitudinal connecting support plate 211 and a transverse connecting support plate 212; one end of the longitudinal connecting device 21 is connected with one end of the transverse connecting support plate 212; in the present embodiment, the lateral connecting plate 212 is inclined from high to low from the end far from the seat frame 1 to the end near the seat frame 1. By arranging the transverse connecting support plate 212 in an inclined manner; when in use, a user sitting on the transverse connecting plate 212 cannot easily slide out of the transverse connecting plate 212; the use experience is good.

The longitudinal connecting device 21 is provided with a connecting part 213 protruding outwards; the connecting part 213 is provided with a first connecting piece 2131, a second connecting piece 2132 and a second clamping groove 2133; the first connecting piece 2131 and the second connecting piece 2132 are formed by inclining and protruding from the end surface of the connecting part 213 close to the chair frame 1 to the direction of the chair frame 1; the inclination directions of the first connecting piece 2131 and the second connecting piece 2132 are the same as the connecting groove 141; the first connecting piece 2131 and the second connecting piece 2132 are matched with the connecting groove 141; the second blocking groove 2133 is formed by recessing the connecting part 213 from the surface far away from the longitudinal connecting device 21 to the surface close to the longitudinal connecting device 21; the second blocking groove 2133 is communicated with the first blocking groove 142; the stopper 3 connects the second stopper groove 2133 and the first stopper groove 142. More than one first clamping grooves 142 and connecting grooves 141 are uniformly distributed on the longitudinal support 14; the connecting device 21 is provided with a first connecting piece 2131, a second connecting piece 2132 and a second clamping groove 2133; the first connecting piece 2131 and the second connecting piece 2132 are matched with connecting grooves 141 with different heights arranged on the longitudinal bracket 14; the height of the connecting device 21 on the supporting mechanism 2 is adjusted; the connecting groove 141 is obliquely arranged, and the inclined direction is freely arranged from the high to the low from the first longitudinal end surface 143 to the second longitudinal end surface 144; the first link 2131 and the second link 2132 provided in the connecting groove 141 in this way are installed on the connecting groove 141 from high to low; the first and

second connectors

2131 and 2132 do not easily slip out of the connecting groove 141; the first connecting piece 2131, the second connecting piece 2132 and the connecting groove 141 are stably connected; so that the supporting mechanism 2 and the chair frame 1 are stably connected; the second blocking groove 2133 and the first blocking groove 142 are connected by arranging the blocking piece 3; further enhancing the connecting effect between the supporting mechanism 2 and the chair frame 1. Thus, the stability is good.

The holding mechanism 2 includes a holding device 22; more than one supporting device 22 is arranged; in this embodiment, two supporting devices 22 are provided. The holding device 22 is connected with the bottom surface of the transverse connecting support plate 212; the holding device 22 comprises a holding piece 221 and a holding clamping piece 222; in this embodiment, the retainer snaps 222 are tongue blocks. The bearing piece 221 is provided with a bearing connecting part 223 extending towards the direction close to the first transverse bracket 11; a holder connecting through hole 224 is provided in the holder connecting portion 223; the first transverse bracket 11 is provided with a first mounting part 111; the number of the first mounting portions 111 is the same as that of the supporting devices 22; in the present embodiment, two first mounting portions 111 are provided. The support connecting part 223 and the support latch 222 are arranged on the first mounting part 111; the holder snaps 222 are connected to the holder connecting through-holes 224. The supporting device 22 is arranged to be connected with the transverse connecting support plate 212; meanwhile, the supporting device 22 is arranged on the chair frame 1; the support device 22 can thus provide a supporting force for the connecting device 21.

The first mounting portion 111 includes a first mounting through groove 112, a first mounting through hole 113, and a first plugging through groove 114; the first mounting through groove 112 is concavely formed on the side surface of the first transverse bracket 11 in the direction away from the connecting device 21; the first mounting through hole 113 and the first inserting through groove 114 are concavely formed on the top surface of the first transverse bracket 11 in the direction far away from the second transverse bracket 12; the first mounting through hole 113 is arranged in parallel with the first inserting through groove 114; the first mounting through hole 113 is positioned above the first inserting through groove 114, and the first mounting through groove 112 is positioned between the first mounting through hole 113 and the first inserting through groove 114; the first mounting through groove 112, the first mounting through hole 113 and the first plugging through groove 114 are communicated; the bearing connecting part 223 is arranged on the first mounting through groove 112; the bearing clamping piece 222 sequentially passes through the first mounting through hole 113 and the bearing connecting through hole 224 to be mounted on the first inserting through groove 114. The supporting piece 221 and the supporting clamping piece 222 are connected with the first installation part 111, and the supporting clamping piece 222 sequentially passes through the first installation through hole 113 and the supporting connection through hole 224 to be installed in the first inserting through groove 114; thus, the supporting piece 221 is fixed on the first installation part 111 through the supporting clamping piece 222; the supporting piece 221, the supporting clamping piece 222 and the first transverse bracket 11 are not connected through bolts; the connecting structure is simple.

The chair frame 1 also comprises a third transverse bracket 13; the third transverse bracket 13 is positioned above the first transverse bracket 11; and the third transverse bracket 13 is connected between the two longitudinal brackets 14; the third lateral bracket 13 is provided with a second mounting portion 131; the number of the second mounting portions 131 is the same as that of the supporting devices 22; the bearing connecting part 223 and the bearing clamping piece 222 are arranged on the second mounting part; the holder snaps 222 are connected to the holder connecting through-holes 224. The third transverse bracket 13 is arranged to be connected between the two longitudinal brackets 14, so that the stability is improved; meanwhile, a second mounting part 131 is arranged on the third transverse bracket 13; the second mounting part 131 is connected with the supporting device 22 in a matching way; and because the third transversal support 13 is located above the first transversal support 11; thus when the connecting device 21 needs to be adjusted in height on the chair frame 1; the supporting device 22 can also be adjusted in height following the connecting device 21.

The second mounting portion 131 includes a second mounting through groove 132, a second mounting through hole 133, and a second insertion through groove 134; the second mounting through slot 132 is concavely formed on the side surface of the third transverse bracket 13 in the direction away from the connecting device 21; the second mounting through hole 133 and the second plugging through groove 134 are concavely formed on the top surface of the third transverse bracket 13 in the direction away from the second transverse bracket 12; the second mounting through hole 133 and the second inserting through groove 134 are arranged in parallel; the second mounting through hole 133 is located above the second plugging through groove 134, and the second mounting through groove 132 is located between the second mounting through hole 133 and the second plugging through groove 134; the second mounting through groove 132, the second mounting through hole 133 and the second plugging through groove 134 are communicated; the bearing connecting part 223 is arranged on the second mounting through groove 132; the bearing clamping piece 222 sequentially passes through the second mounting through hole 133 and the bearing connecting through hole 224 and is mounted on the second inserting through groove 134. The supporting piece 221 and the supporting clamping piece 222 are connected with the second mounting part 131, and the supporting clamping piece 222 sequentially passes through the second mounting through hole 133 and the supporting connecting through hole 224 to be mounted in the second inserting through groove 134; thus, the supporting piece 221 is fixed on the second mounting part 131 through the supporting clamping piece 222; the supporting piece 221, the supporting clamping piece 222 and the second transverse bracket 12 do not need to be connected through bolts; the connecting structure is simple.

The connection means 21 further comprise a flexible support 23; the flexible support 23 is provided on the wall surfaces of the transverse connecting bracket 212 and the longitudinal connecting bracket 211 remote from the seat frame 1. By providing the flexible support 23, the use is comfortable.

The chair leg 4 comprises a first arm brace 41, a second arm brace 42 and a third arm brace 43; the first temple 41 and the second temple 42 are symmetrically disposed about the third temple 43; the first arm brace 41 and the second arm brace 42 extend in the direction close to the supporting mechanism 2; the third supporting leg 43 extends in a direction away from the supporting mechanism 2; such that the first temple 41, the second temple 42 and the third temple 43 form a triangular configuration when viewed from the side. The first supporting leg 41, the second supporting leg 42 and the third supporting leg 43 which form a triangular structure are arranged; thus, the stability of the chair leg 4 is good; and the chair legs 4 have good supporting effect on the chair frame 1.

When the height is adjusted by the scheme; disassembling the clamping piece 3; the first connecting piece 2131 and the connecting groove 141 and the second connecting piece 2132 and the connecting groove 141 are disconnected; the bearing clamping piece 222 is disassembled; the connection between the supporting piece 221 and the first installation through groove 112 is released; then, the bearing connecting part 223 of the bearing piece 221 is installed on the second installation through groove 132; the bearing clamping piece 222 sequentially passes through the second mounting through hole 133 and the bearing connecting through hole 224 to be mounted on the second inserting through groove 134; then, the second connecting piece 2132 is connected with the uppermost connecting groove 141, and the first connecting piece 2131 is connected with the connecting groove 141 below the uppermost connecting groove 141; the locking element 3 and the second locking groove 2133 are then connected to the uppermost first locking groove 142.

Claims

1. A lifting chair is characterized in that: comprises chair legs, a chair frame, a supporting mechanism and a clamping piece; the chair legs are connected with the chair frame and positioned below the chair frame; the supporting mechanism is arranged on the chair frame; the clamping piece is connected with the chair frame and the supporting mechanism;

2. A lift chair as claimed in claim 1, wherein: the supporting mechanism comprises a supporting device; more than one supporting device is arranged; the supporting device is connected with the bottom surface of the transverse connecting support plate; the supporting device comprises a supporting piece and a supporting clamping piece; the bearing connecting part extends towards the direction close to the first transverse bracket; the bearing connecting part is provided with a bearing connecting through hole; the first transverse bracket is provided with a first mounting part; the number of the first mounting parts is the same as that of the supporting devices; the bearing connecting part and the bearing clamping piece are arranged on the first mounting part; the bearing clamping piece is connected with the bearing connecting through hole.

3. A lift chair as claimed in claim 2, wherein: the chair frame also comprises a third transverse bracket; the third transverse bracket is positioned above the first transverse bracket; and the third transverse bracket is connected between the two longitudinal brackets; the third transverse bracket is provided with a second mounting part; the number of the second mounting parts is the same as that of the supporting devices; the bearing connecting part and the bearing clamping piece are arranged on the second mounting part; the bearing clamping piece is connected with the bearing connecting through hole.

4. A lift chair as claimed in claim 2, wherein: the first mounting part comprises a first mounting through groove, a first mounting through hole and a first splicing through groove; the first mounting through groove is formed in a concave mode in the direction away from the connecting device on the side face of the first transverse support; the first mounting through hole and the first inserting through groove are formed in a concave mode in the direction away from the second transverse support on the top face of the first transverse support; the first mounting through hole is arranged in parallel with the first inserting through groove; the first mounting through hole is positioned above the first splicing through groove, and the first mounting through groove is positioned between the first mounting through hole and the first splicing through groove; the first mounting through groove, the first mounting through hole and the first inserting through groove are communicated; the bearing connecting part is arranged on the first mounting through groove; the bearing fastener passes first installation through-hole, bearing connect the through-hole in proper order and installs on first grafting logical groove.

5. A lift chair as claimed in claim 3, wherein: the second mounting part comprises a second mounting through groove, a second mounting through hole and a second inserting through groove; the second mounting through groove is formed in a concave mode in the direction away from the connecting device on the side face of the third transverse support; the second mounting through hole and the second inserting through groove are formed in a concave mode in the direction away from the second transverse support on the top face of the third transverse support; the second mounting through hole is arranged in parallel with the second inserting through groove; the second mounting through hole is positioned above the second inserting through groove, and the second mounting through groove is positioned between the second mounting through hole and the second inserting through groove; the second mounting through groove, the second mounting through hole and the second inserting through groove are communicated; the bearing connecting part is arranged on the second mounting through groove; the bearing fastener passes second installation through-hole, bearing connect the through-hole in proper order and installs on the logical groove of second grafting.

6. A lift chair as claimed in claim 3, wherein: the transverse connecting support plate is arranged from high to low in an inclined mode from one end far away from the chair frame to one end close to the chair frame.

7. A lift chair as claimed in claim 6, wherein: the connection device further comprises a flexible support; the flexible supporting piece is arranged on the wall surfaces of the transverse connecting support plate and the longitudinal connecting support plate far away from the chair frame.

8. A lift chair as claimed in claim 1, wherein: the chair leg comprises a first arm brace, a second arm brace and a third arm brace; the first arm brace and the second arm brace are symmetrically arranged around the third arm brace; the first supporting leg and the second supporting leg extend towards the direction close to the bearing mechanism; the third supporting leg extends towards the direction far away from the supporting mechanism.