Foldable transfer chair

Abstract

The present invention relates to a foldable shift chair, comprising a base frame and a plurality of rollers arranged at the bottom of the base frame, a left upright rod and a right upright rod are arranged above one end of the base frame, a cushion frame and a backrest frame are arranged in sequence from bottom to top above the base frame, the cushion frame comprises a left cushion frame and a right cushion frame that are split, the front end of the left cushion frame is pivotally connected to the left upright rod, the front end of the right cushion frame is pivotally connected to the right upright rod, the rear end of the left cushion frame and the rear end of the right cushion frame are mutually enclosed and locked by a cushion frame locking mechanism, a cushion is respectively arranged on the inner side of the left cushion frame and the inner side of the right cushion frame, the backrest frame comprises a left backrest frame and a right backrest frame that are split, the front end of the left backrest frame is pivotally connected to the left upright rod, the front end of the right backrest frame is pivotally connected to the right upright rod, the rear end of the left backrest frame and the rear end of the right backrest frame are mutually enclosed and locked by a backrest frame locking mechanism. The present invention is easy to adjust, can be retracted and folded, and reduces space occupation.

Description

Technical Field

[0001] The invention relates to a shift chair, in particular to a foldable shift chair. Background Art

[0002] Some people with lower limb disability often use a transfer chair to get around. The transfer chair includes a seat frame, a seat is arranged on the seat frame, and moving wheels are arranged under the seat frame.

[0003] People with lower limb disabilities often find it very difficult to sit on a transfer chair, and even to stand up. Therefore, common transfer chairs are often troublesome to use, and can cause secondary injuries to users if they are not careful, causing great distress to users. Summary of the invention

[0004] The purpose of the present invention is to provide a foldable transfer chair that is easy to use, safe and reliable, and solves the problems of the prior art such as inconvenience in use and easy to cause secondary injuries.

[0005] The above technical objectives of the present invention are mainly solved by the following technical solutions: a foldable shift chair, comprising a base frame and a plurality of rollers arranged at the bottom of the base frame, a left upright rod and a right upright rod being arranged above one end of the base frame, a seat cushion frame and a backrest frame being arranged in sequence from bottom to top above the base frame, the seat cushion frame comprising a left seat cushion frame and a right seat cushion frame that are split apart, the front end of the left seat cushion frame being pivotally connected to the left upright rod, the front end of the right seat cushion frame being pivotally connected to the right upright rod, the rear ends of the left seat cushion frame and the right seat cushion frame being enclosed with each other and locked by a seat cushion frame locking mechanism, seat cushions being respectively arranged on the inner sides of the left seat cushion frame and the inner sides of the right seat cushion frame, and the two seat cushions being enclosed with each other in the middle A circular cavity is formed in the portion, and the backrest frame comprises a left backrest frame and a right backrest frame which are opened apart. The front end of the left backrest frame is pivotally connected to the left upright rod, and the front end of the right backrest frame is pivotally connected to the right upright rod. The rear ends of the left backrest frame and the right backrest frame are mutually enclosed and locked by a backrest frame locking mechanism, and the left backrest frame and the right backrest frame are respectively provided with a backrest; through the arrangement of the above-mentioned seat cushion frame locking mechanism and the backrest frame locking mechanism, the support frame can be disassembled and fixed as needed, which is convenient for users with limited mobility, and is simpler, more convenient and easy to operate. At the same time, it can prevent users with limited mobility from suffering secondary injuries, thereby increasing safety.

[0006] Preferably, the base frame includes a first support rod with two ends respectively arranged below the left upright rod and the right upright rod, and both ends of the first support rod are provided with a second support rod extending backward and on the same side as the cushion frame, the first support rod and the second support rod are mutually enclosed to form a U-shaped structure, and the tops of the left upright rod and the right upright rod are respectively fixed with a first handle and a second handle; through the above-mentioned arrangement of the base frame, when the user moves to the seat in a sitting position, the user's feet will not be hindered and there is no need to keep lifting them up, which reduces the burden on the user and makes it easier for the user to sit on the shift chair. At the same time, it can minimize the obstruction of the shift chair during use, thereby improving convenience of use.

[0007] Preferably, a lifting and locking mechanism for controlling the seat height is provided on the side walls of the left and right uprights, the lifting and locking mechanism comprising an inner tube arranged in the left upright, a plurality of limiting holes arranged at equal intervals on one side of the tube wall of the inner tube, and a locking piece matched with the limiting holes, the locking piece is a pin-shaped structure, a fixing seat is provided on the tube wall of the left upright, a through hole for movement of the locking piece is coaxially provided on the fixing seat and the side wall of the upright, a movable groove is provided on the fixing seat, a rotatable locking wrench is provided in the movable groove, an end of the locking piece is rotatably connected to the locking wrench, and a fixedly provided between the inner wall of the movable groove and the locking wrench Coil spring; the setting of the above-mentioned lifting and locking mechanism allows the locking piece to cooperate with the limiting hole to achieve locking of the inner tube and the upright pole, ensuring that the inner tube is fixed in the upright pole, and realizing the lifting and lowering operation of the seat to adapt to users of different heights. Through the setting of the above-mentioned locking piece and perforation, the inner tube can be moved and fixed on the upright pole by the movement of the locking piece in the perforation, and the locking wrench can control the movement of the locking piece in the perforation, saving operating effort. At the same time, the structure is simple and the operation is convenient. The setting of the above-mentioned coil spring allows the above-mentioned locking wrench to automatically reset, thereby automatically controlling the locking piece to lock the upright pole and the inner tube.

[0008] Preferably, a flip locking mechanism for controlling the folding of the seat is provided between the base frame and the left and right uprights, the flip locking mechanism comprising a connecting seat provided below the inner tube, a connecting portion provided at the bottom of the inner tube and rotatably connected to one end of the connecting seat, and a locking handle rotatably connected to the other end of the connecting seat, the locking piece is a spherical structure, a fixed shell and a through hole for the locking piece to pass through and to enable the locking piece to cooperate with a certain limiting hole are provided on the tube wall of the left upright, a cavity substantially parallel to the axis of the inner tube is provided in the fixed shell, a limiting column which can move up and down in the cavity is provided in the cavity, a reset spring is provided between the lower end of the limiting column and the bottom of the cavity, and a side wall of the limiting column is provided with a The accommodating groove, the limiting column is formed with an inclined surface at a position corresponding to the bottom of the accommodating groove, and the inclined surface can abut against the locking piece and push the metal sphere into the limiting hole; through the setting of the above-mentioned limiting column, the locking piece can lock and release the inner tube through the up and down movement of the limiting column, thereby enhancing the stability of the structure, and the setting of the reset spring allows the limiting column to automatically reset to achieve automatic locking of the inner tube, simplifying the operating steps, and through the coordinated setting of the above-mentioned accommodating groove and the inclined surface, the locking piece can achieve a lateral movement effect through the inclined surface and the accommodating groove during the vertical movement of the limiting column, thereby separating and contacting with the limiting hole to achieve movement control of the inner tube, and at the same time the inclined surface can reduce the loss of the locking piece during movement.

[0009] Preferably, the fixed shell is provided with a fixing groove below the cavity, a limiting cylinder is provided in the fixing groove, a movable top ball is provided in the limiting cylinder, a telescopic spring is provided between the limiting cylinder and the top ball, and the top ball can enter a certain limiting hole under the action of the telescopic spring, a blocking portion is provided at the opening of the limiting cylinder, an arc-shaped clamping portion is provided on the inner wall of the blocking portion, the diameter of the top ball is larger than the inner diameter of the arc-shaped clamping portion, an annular fixing block is provided on the through hole, and the inner diameter of the annular fixing block is smaller than the diameter of the locking piece; through the arrangement of the above-mentioned top ball and the limiting cylinder, the top ball can be automatically moved in the limiting cylinder. By moving, the top ball cannot hinder the inner tube when the inner tube needs to move, thereby ensuring the stable operation of the structure. Through the arrangement of the above-mentioned telescopic spring, the top ball can keep the inner tube limited at all times, thereby preventing the inner tube from moving freely in the outer tube when the wrench is pulled upward, thereby playing a role of insurance. Through the arrangement of the above-mentioned blocking portion and the arc-shaped clamping portion, the top ball can be blocked, thereby preventing the top ball from escaping from the limiting cylinder. Through the arrangement of the above-mentioned annular fixing block, the locking piece can be blocked, thereby preventing the locking piece from moving excessively or moving around and getting out of position, thereby causing damage to the device.

[0010] Preferably, a control wrench is provided on the outside of the upper end of the fixed shell, the middle part of the control wrench is pivotally connected to the fixed shell, the end of the control wrench is in contact with the upper end of the limit column, the control wrench includes a pressing part and a driving part, the end of the driving part is in contact with the top end of the limit column, and the end of the driving part is provided with an inclined contact surface; through the arrangement of the above-mentioned pressing part and the driving part, the shift chair can achieve the effect of lifting and contraction by simply controlling the control wrench, and the end of the driving part is in contact with the end of the limit column, which can ensure the stable driving of the limit column by the driving part, and the position of the limit column is always limited to avoid the limit column being forced to move upward excessively, resulting in non-correspondence with the locking member, thereby affecting the control of the movement of the locking member; through the arrangement of the above-mentioned contact surface, the control wrench always maintains a planar contact with the limit column at the beginning and end of the flipping, thereby enhancing the limiting stability of the limit column, and avoiding the control wrench from easily detaching after flipping up or down, resulting in failure of control of the locking member.

[0011] Preferably, a limiting portion located above the connecting portion is provided on the side wall of the locking handle, the limiting portion is provided with a first fixing groove, a positioning pin is passed through the bottom of the first fixing groove, a first fastening screw is provided at the upper end of the first fixing groove, a compression spring connected to the bottom of the first fastening screw is provided at the upper end of the positioning pin, a shift rod is passed through the middle of the positioning pin, a positioning hole matched with the positioning pin is provided on the top of the connecting seat, and a strip groove for vertical movement of the shift rod is provided on the side wall of the first fixing groove; through the arrangement of the above-mentioned locking handle, the vertical pole can be locked and released on the connecting portion by flipping the locking handle, thereby reducing the difficulty of flipping the vertical pole, and the coordinated arrangement of the above-mentioned positioning pin and the positioning hole can lock the locking handle to prevent the locking handle from loosening due to vibration and accidental touch, thereby effectively increasing The locking stability of the locking handle on the upright pole is enhanced. The setting of the compression spring allows the locating pin to be automatically inserted into the locating hole, making the locking of the locking handle easier and more labor-saving. The setting of the lever can easily cancel the locking of the locating pin, so as to release the upright pole and fold the shift chair, which is very simple and convenient. The setting of the above-mentioned strip groove plays a limiting role in the lever, so that the lever can move vertically stably, ensuring that the operator can control the locating pin by controlling the lever. At the same time, the operation is simple and convenient when folding, and the space occupied after folding is small. The setting of the flip locking mechanism allows the upright pole to be locked and released on the upright pole seat by flipping the locking wrench, reducing the difficulty of flipping the upright pole. At the same time, the operation is simple and convenient when folding, and fewer bolts are used, avoiding the trouble of use and increasing the aesthetics.

[0012] Preferably, a second fixing groove is provided on the limiting portion, a second fastening screw is provided in the second fixing groove, the bottom end of the second fastening screw protrudes from the bottom surface of the second fixing groove and can contact the top surface of the connecting portion, and an arc surface is provided at the upper end angle of the connecting portion, and the arc surface is provided at the angle between the bottom end of the limiting portion and the bottom end of the locking handle; through the provision of the above-mentioned second fixing groove and the second fastening screw, the locking wrench can be supported by the second fastening screw when locking the connecting portion, and the reaction acts on the upper surface of the connecting portion to avoid vertical shaking when the locking wrench locks the connecting portion, thereby enhancing the locking stability of the locking wrench; through the provision of the above-mentioned arc surface, the positioning pin can move along the arc surface when the above-mentioned locking wrench is flipped, thereby reducing the obstruction to the positioning pin when the positioning pin moves to the top of the connecting portion.

[0013] Preferably, the seat cushion frame and the backrest frame are connected by a connecting rod, and the seat cushion frame locking mechanism is arranged on the connecting rod, and the seat cushion frame locking mechanism comprises a U-shaped fixing block arranged at the rear end of the left seat cushion frame and a locking block arranged at the rear end of the right seat cushion frame and between the two side walls of the U-shaped fixing block. One side of the locking block is provided with a through groove, and the U-shaped fixing block is provided with a movable column that can move in the through groove, one side of the U-shaped fixing block is provided with a first groove, and the other side of the U-shaped fixing block is provided with a second groove, and the movable column is passed through the first groove. Through the coordinated arrangement of the above-mentioned U-shaped fixing block and the locking block, the above-mentioned two third support parts can be locked and moved by the cooperation of the locking block and the movable column, so that the seat can be disassembled and fixed, which is convenient for people with limited mobility to move onto the seat easily, avoiding inconvenience, and is simple to operate and very practical.

[0014] Preferably, a pressure block is provided at the end of the movable column located in the first groove, a locking spring is provided between the pressure block and the first groove, and a card block is provided at the other end of the movable column that passes through the second groove, the diameter of the card block is larger than the diameter of the movable column, and one side of the through groove is provided with a card slot for the card block to pass through; through the arrangement of the above-mentioned pressure block and the locking spring, the movable column can be moved in the through groove by squeezing the pressure block and resetting the locking spring, so that the separation and combination of the two support frames can be controlled, and the arrangement of the card block and the card slot makes it possible for the two support frames to be locked in the card slot by the card block. When locking the two support frames at the same time, it is only necessary to control the two support frames to be close to each other, and the card block will automatically be stuck in the card slot. The structure is simple and easy to operate.

[0015] Therefore, the present invention has the advantages of simple structure, convenient and labor-saving adjustment, few adjustment steps, no need to adjust the seat by nuts and bolts, reduced loss and increased aesthetics, and can be retracted and folded to reduce the volume of the shift chair and reduce space occupancy. At the same time, it can avoid secondary injuries to users and is more convenient to use and simpler to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 yes Figure 1 A three-dimensional cross-sectional view of the lifting and locking mechanism in FIG.

[0018] Figure 3 yes Figure 1 A three-dimensional cross-sectional view of another lifting and locking mechanism in FIG.

[0019] Figure 4 yes Figure 3 A magnified view of the structure at A in FIG.

[0020] Figure 5 yes Figure 3 A magnified view of the structure at B in FIG.

[0021] Figure 6 yes Figure 1 A three-dimensional cross-sectional view of the flip locking mechanism in FIG.

[0022] Figure 7 yes Figure 1 A three-dimensional cross-sectional view of a cushion frame locking mechanism;

[0023] Figure 8 hour Figure 1 A three-dimensional structural diagram of the locking block in FIG.

[0024] Fig. 9 yes Figure 1 A three-dimensional structural diagram of the backrest frame locking mechanism in FIG. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0026] Example 1: Figure 1-9As shown, a foldable shift chair comprises a base frame 1 and a plurality of rollers 11 arranged at the bottom of the base frame 1, a left upright rod 2 and a right upright rod 3 are arranged above one end of the base frame 1, a cushion frame 12 and a backrest frame 13 are arranged in sequence from bottom to top above the base frame 1, the cushion frame 12 comprises a left cushion frame 121 and a right cushion frame 122 which are split apart, the front end of the left cushion frame 121 is pivotally connected to the left upright rod 2, the front end of the right cushion frame 122 is pivotally connected to the right upright rod 3, the rear end of the left cushion frame 121 and the rear end of the right cushion frame 122 are mutually enclosed and locked by a cushion frame locking mechanism 4, a cushion 123 is respectively arranged on the inner side of the left cushion frame 121 and the inner side of the right cushion frame 122, and a circular cavity 1 is formed between the two cushions 123 which are mutually enclosed in the middle. 24. The backrest frame 13 includes a left backrest frame 131 and a right backrest frame 132 which are separated. The front end of the left backrest frame 131 is pivotally connected to the left upright rod 2, and the front end of the right backrest frame 132 is pivotally connected to the right upright rod 3. The rear ends of the left backrest frame 131 and the rear ends of the right backrest frame 132 are mutually enclosed and locked by the backrest frame locking mechanism 5. The left backrest frame 131 and the right backrest frame 132 are respectively provided with a backrest 133. Through the arrangement of the above-mentioned cushion frame locking mechanism and the backrest frame locking mechanism, the support frame can be disassembled and fixed as needed, which is convenient for users with mobility impairments. It is simpler, more convenient and easy to operate. At the same time, it can prevent users with mobility impairments from secondary injuries, thereby increasing safety.

[0027] like Figure 1 As shown, the base frame 1 includes a first support rod 14 whose two ends are respectively arranged below the left upright rod 2 and the right upright rod 3, and both ends of the first support rod 14 are provided with a second support rod 15 extending backward and on the same side as the cushion frame 12. The first support rod 14 and the second support rod 15 are mutually enclosed to form a U-shaped structure, and the tops of the left upright rod 2 and the right upright rod 3 are respectively fixed with a first handle 21 and a second handle 31. Through the above-mentioned arrangement of the base frame, when the user moves to the seat in a sitting position, the user's feet will not be hindered and there is no need to keep lifting them up, which reduces the burden on the user and makes it easier for the user to sit on the shift chair. At the same time, it can minimize the obstruction of the shift chair during use, thereby improving the convenience of use.

[0028] like Fig. 9 As shown, the backrest frame locking mechanism 5 includes a rotatable locking block 331 provided on a certain seat back 33 and a connecting block 332 provided on another seat back 33 and matched with the locking block 331. The connecting block is fixed to the seat back by a fastening screw 333. One end of the locking block is fixed to the seat back by a fastening screw. The other end of the locking block is provided with a locking groove 334 matched with the fastening screw. When locking the two seat backs, the locking block can be flipped so that the locking groove on the locking block can be just stuck on the fastening screw, thereby fixing the seat backs together.

[0029] like Figure 2As shown, the side walls of the left upright 2 and the right upright 3 are provided with a lifting and locking mechanism for controlling the seat height, the lifting and locking mechanism comprises an inner tube 22 arranged in the left upright 2, a plurality of limiting holes 221 arranged at equal intervals on one side of the tube wall of the inner tube 22, and a locking member 222 matched with the limiting hole 221, the locking member 222 is a pin-shaped structure, a fixing seat 25 is provided on the tube wall of the left upright 2, a through hole 251 for the locking member 222 to move is coaxially provided on the fixing seat 25 and the side wall of the upright 2, a movable groove 252 is provided on the fixing seat 25, and the movable groove 252 is provided with a through hole 251 for the locking member 222 to move. A rotatable locking wrench 253 is provided, and the end of the locking piece 222 is rotatably connected to the locking wrench 253. A coil spring 254 is fixedly provided between the inner wall of the movable groove 252 and the locking wrench 253. Through the arrangement of the above-mentioned locking piece and the perforation, the inner tube can be moved and fixed on the vertical pole by the movement of the locking piece in the perforation. The locking wrench can control the movement of the locking piece in the perforation, saving the effort of operation. At the same time, the structure is simple and the operation is convenient. The arrangement of the above-mentioned coil spring allows the above-mentioned locking wrench to be automatically reset, thereby automatically controlling the locking piece to lock the vertical pole and the inner tube.

[0030] like Figure 6As shown, a limiting portion 241 located above the connecting portion 223 is provided on the side wall of the locking handle 24, and a first fixing groove 242 is provided on the limiting portion 241. A positioning pin 243 is passed through the bottom of the first fixing groove 242, and a first fastening screw 244 is provided at the upper end of the first fixing groove 242. A compression spring 245 connected to the bottom of the first fastening screw 244 is provided at the upper end of the positioning pin 243. A lever 246 is passed through the middle of the positioning pin 243. A positioning hole 231 matched with the positioning pin 243 is provided on the top of the connecting seat 23. A lever 246 is provided on the side wall of the first fixing groove 242. The strip groove 247 of 246 vertical movement, through the setting of the locking handle, the vertical pole can be locked and released on the connection part by flipping the locking handle, which reduces the difficulty of flipping the vertical pole. The matching setting of the positioning pin and the positioning hole can lock the locking handle to prevent the locking handle from loosening due to vibration and accidental touch, and effectively strengthen the locking stability of the locking handle for the vertical pole. The setting of the compression spring allows the positioning pin to be automatically inserted into the positioning hole, making the locking of the locking handle easier and more labor-saving, and the setting of the lever can easily cancel the locking of the positioning pin. In order to release the vertical rod and fold the shift chair, it is very simple and convenient. The setting of the above-mentioned strip groove plays a role in limiting the lever, so that the lever can stably move vertically, ensuring that the operator can control the positioning pin by controlling the lever. At the same time, the operation is simple and convenient when folding, and the space occupied after folding is small; a second fixing groove 248 is provided on the limiting portion 241, and a second fastening screw 249 is provided in the second fixing groove 248. The bottom end of the second fastening screw 249 protrudes from the bottom surface of the second fixing groove 248 and can contact the top surface of the connecting portion 223. An arc surface 232 is provided at the angle of the upper end, and the arc surface 232 is provided at the angle between the bottom end of the limiting portion 241 and the bottom end of the locking handle 24. Through the arrangement of the above-mentioned second fixing groove and the second fastening screw, the locking handle can be supported by the second fastening screw when locking the connection part, and the upper surface of the reaction connection part is avoided to avoid vertical shaking of the locking handle when locking the connection part, thereby enhancing the locking stability of the locking handle. Through the arrangement of the above-mentioned arc surface, when the above-mentioned locking handle is flipped, the positioning pin can move along the arc surface, thereby reducing the obstruction to the positioning pin when the positioning pin moves to the top of the connection part.

[0031] When the locking handle is flipped up, the bottom end of the positioning pin moves along the arc surface toward the positioning hole. At this time, the positioning pin telescopes along the arc surface, and the compression spring telescopes as the positioning pin telescopes. When the positioning pin moves to the top of the positioning hole, the positioning pin will be moved into the positioning hole by the downward elastic force of the compression spring, thereby locking the locking handle and the locking handle can no longer be flipped over; when the locking handle is flipped down, the lever is pulled, the lever drives the positioning pin to move up, the compression spring contracts, and then the locking handle is flipped over, the locking handle can be flipped down, and the lock of the opposing rod seat is cancelled, so that the shift chair can be folded. When the shift chair needs to be folded, the lever can be directly inserted into the circular through hole, thereby driving the positioning pin to move up. When the shift chair is used, the lever is pulled out and the positioning pin cannot be touched. It is very safe, and the lever acts as a key.

[0032] When locking, flip up the locking handle, and the positioning pin will retract inwards due to the pressure of the inclined surface on the base. When the locking handle is in place, the positioning pin will extend out of the locking handle due to the pressure of the compression spring and insert into the corresponding positioning hole of the connecting seat. At this time, the connection part is firmly fixed on the connecting seat and will not be affected by any vibration or misoperation. If you want to bend it, unless you break the positioning pin, because the positioning pin is made of heat-treated steel with a diameter of 8mm, its bending force can reach more than 30Kg, which is enough to withstand the external force of the vertical pole.

[0033] like Figure 1 and 7As shown in , the seat cushion frame 12 and the backrest frame 13 are connected by a connecting rod 16, and the seat cushion frame locking mechanism 4 is arranged on the connecting rod 16. The seat cushion frame locking mechanism 4 includes a U-shaped fixing block 41 arranged at the rear end of the left seat cushion frame 121 and a locking block 42 arranged at the rear end of the right seat cushion frame 122 and located between the two side walls of the U-shaped fixing block 41. A through groove 421 is provided on one side of the locking block 42, and a movable column 411 that can move in the through groove 421 is provided on the U-shaped fixing block 41. A first groove 412 is provided on one side of the U-shaped fixing block 41, and a second groove 413 is provided on the other side of the U-shaped fixing block 41. The movable column 411 is penetrated into the first groove 412. Through the cooperation of the above-mentioned U-shaped fixing block and the locking block, the above-mentioned two third supporting parts can be locked and moved by the cooperation of the locking block and the movable column, so that the seat can be disassembled and fixed, which is convenient for people with limited mobility to easily move to the seat. The locking spring 415 is provided between the first and second grooves 414 and 415, and the other end of the movable column 411 is provided with a clamping block 416 which is inserted into the second groove 413. The diameter of the clamping block 416 is larger than the diameter of the movable column 411. A clamping groove 422 for the clamping block 416 to pass through is provided on one side of the through groove 421. Through the arrangement of the above-mentioned clamping block and the locking spring, the movable column can be moved in the through groove by squeezing the clamping block and resetting the locking spring, so that the separation and combination of the two support frames can be controlled. The arrangement of the clamping block and the clamping groove enables the two support frames to achieve a locking effect in the clamping groove through the clamping block. When locking the two support frames at the same time, it is only necessary to control the two support frames to be close to each other, and the clamping block will automatically be clamped into the clamping groove. The structure is simple and easy to operate.

[0034] Before releasing the lock of the first fixing component, first press the pressure block, which drives the movable column to move in the through-slot, and the movable column drives the card block to move, and the card block leaves the card slot, pulls a certain support frame to make it rotate, and the movable column can leave the through-slot to achieve the separation of the two support frames. When locking the two support frames, directly push one of the support frames to make it closer to the other support frame. When the movable column enters the through-slot, the card block on the movable column will automatically fit into the card slot, and the fixation is automatically completed.

[0035] When assisting the user to move to the seat, first open the two support frames, then move the seat in front of the user, who is now in a sitting position, and then continue to move the seat toward the user so that the support frames are on both sides of the user's body, then flip the support frames, and move the seat cushion under the user's buttocks, and then continue to rotate the support frames until the two support frames are locked, and the user is now just sitting on the seat cushion, and the seat can be moved at this time without the user having to walk or stand.

[0036] Embodiment 2: The difference between this embodiment and embodiment 1 is that:

[0037] like Figure 3-5 As shown, a flip locking mechanism for controlling the folding of the seat is provided between the base frame 1 and the left and right uprights 2 and 3. The flip locking mechanism includes a connecting seat 23 provided below the inner tube 22, a connecting portion 223 provided at the bottom of the inner tube 22 and rotatably connected to one end of the connecting seat 23, and a locking handle 24 rotatably connected to the other end of the connecting seat 23. The locking member 222 is a spherical structure. A fixed shell 26 and a through hole 27 for the locking member 222 to pass through and for the locking member 222 to cooperate with a certain limiting hole 221 are provided on the tube wall of the left upright 2. A cavity 261 substantially parallel to the axis of the inner tube 22 is provided in the fixed shell 26. A through hole 27 that can be inserted into the cavity 261 is provided in the cavity 261. A limit column 262 moves up and down, a reset spring 263 is arranged between the lower end of the limit column 262 and the bottom of the cavity 261, and a side wall of the limit column 262 is provided with a receiving groove 264 that can accommodate part of the locking piece 222. The limit column 262 is formed with an inclined surface 266 corresponding to the position below the receiving groove 264. The inclined surface 266 can abut against the locking piece 222 and push the metal ball into the limit hole 221. Through the arrangement of the above-mentioned limit column, the locking piece can realize locking and loosening of the inner tube through the up and down movement of the limit column, thereby enhancing the stability of the structure, and the arrangement of the reset spring allows the limit column to automatically reset to realize automatic locking of the inner tube, thereby simplifying the operation steps. The matching arrangement of the accommodating groove and the inclined surface enables the locking piece to achieve the effect of lateral movement through the inclined surface and the accommodating groove during the vertical movement of the limiting column, thereby separating and contacting with the limiting hole to realize the movement control of the inner tube. At the same time, the inclined surface can reduce the loss of the locking piece during movement. A control wrench 29 is provided on the outside of the upper end of the fixed shell 26. The middle part of the control wrench 29 is pivotally connected to the fixed shell 26. The end of the control wrench 29 abuts against the upper end of the limiting column 262. The control wrench 29 includes a pressing portion 291 and a driving portion 292. The end of the driving portion 292 contacts the top end of the limiting column 262. The end of the driving portion 292 is provided with an inclined contact surface 293. Through the arrangement of the above-mentioned pressing part and the driving part, the shift chair can achieve the effect of lifting, lowering and contracting through simple control of the control wrench, and the end of the driving part is in contact with the end of the limiting column, which can ensure the stable driving of the limiting column by the driving part and limit the position of the limiting column at all times to avoid the limiting column being forced to move upward excessively, resulting in mismatch with the locking piece, and affecting the control of the movement of the locking piece. Through the arrangement of the above-mentioned contact surface, the control wrench always maintains a planar contact with the limiting column at the beginning and end of the flipping, thereby enhancing the limiting stability of the limiting column and avoiding the control wrench from easily detaching after flipping up or down, resulting in failure of control over the locking piece.

[0038] The locking member is provided with a steel ball. In the present invention, the inner tube is provided with six or other number of limit holes into which the steel balls can extend, and the vertical pole is provided with two holes of corresponding distance. A device for controlling the limit column and the steel ball is provided on the outside. The limit column is fixed upward by the upward pressure of the reset spring at ordinary times. At this time, the inclined surface on the limit column squeezes the steel ball outward through the hole of the vertical pole and enters the hole of the inner tube, so that the inner tube is blocked and cannot move in the vertical pole. When the control wrench is pulled up by hand, the control wrench presses down the limit column, and the steel ball can retreat to the limit position. The steel ball can enter the receiving groove along the inclined surface and can be pushed into the limiting hole by the inclined surface; the control wrench can rotate freely on the fixed shell through the connecting shaft, so that the locking of the inner tube can be cancelled by pulling the control wrench upward, and the control wrench can be pulled downward to lock the inner tube and the vertical pole, and the control wrench is subjected to the reaction force of the limiting column and is pressed in the fixed shell, and will not be loosened easily.

[0039] like Figure 3-5 As shown, the fixed housing 26 is provided with a fixing groove 28 below the cavity 261, a limiting cylinder 281 is provided in the fixing groove 28, a movable top ball 282 is provided in the limiting cylinder 281, a telescopic spring 283 is provided between the limiting cylinder 281 and the top ball 282, and the top ball 282 can enter a certain limiting hole 221 under the action of the telescopic spring 283, a stopper 284 is provided at the opening of the limiting cylinder 281, an arc-shaped clamping portion 285 is provided on the inner wall of the stopper 284, the diameter of the top ball 282 is larger than the inner diameter of the arc-shaped clamping portion 285, an annular fixing block 271 is provided on the through hole 27, and the inner diameter of the annular fixing block 271 is smaller than the diameter of the locking member 222, and the top ball 282 is provided with a movable top ball 282. The arrangement of the limit cylinder allows the top ball to move freely in the limit cylinder, so that when the inner tube needs to move, the top ball cannot hinder the inner tube, thereby ensuring the stable operation of the structure. Through the arrangement of the above-mentioned telescopic spring, the top ball can keep the inner tube limited at all times to avoid the free movement of the inner tube in the outer tube when the wrench is pulled upward, thereby playing a role of insurance. Through the arrangement of the above-mentioned blocking portion and the arc-shaped clamping portion, the top ball can be blocked, thereby preventing the top ball from escaping from the limit cylinder. Through the arrangement of the above-mentioned annular fixing block, the locking piece can be blocked, thereby preventing the locking piece from moving excessively or moving around and getting out of position, causing damage to the device.

[0040] The above-mentioned limit cylinder is fixed at the bottom of the fixed shell, and the top ball moves in the limit cylinder through the control of the telescopic spring. In order to prevent the seat from moving freely downward in the outer tube due to the loss of resistance in the inner tube when the control is pulled upward, a top ball is provided at the lower end of the fixed shell for limiting. Since the pressure of the spring steel ball is controlled at about 10Kg, when the seat is moved up or down by hand, it can be operated as long as the force is greater than about 10Kg.

[0041] The remaining structures are the same as those in Example 1.

Claims

1. A foldable transfer chair, comprising a base frame (1) and a plurality of rollers (11) arranged at the bottom of the base frame (1), characterized in that: A left upright pole (2) and a right upright pole (3) are provided above one end of the base frame (1); a seat cushion frame (12) and a backrest frame (13) are provided above the base frame (1) in order from bottom to top; the seat cushion frame (12) comprises a left seat cushion frame (121) and a right seat cushion frame (122) which are split apart; a front end of the left seat cushion frame (121) is pivotally connected to the left upright pole (2); a front end of the right seat cushion frame (122) is pivotally connected to the right upright pole (3); a rear end of the left seat cushion frame (121) and a rear end of the right seat cushion frame (122) are mutually enclosed and locked by a seat cushion frame locking mechanism (4); an inner side of the left seat cushion frame (121) and an inner side of the right seat cushion frame (122) are connected to the left upright pole (2); a rear end of the left seat cushion frame (121) and a rear end of the right seat cushion frame (122) are mutually enclosed and locked by a seat cushion frame locking mechanism (4); 2) cushions (123) are respectively provided on the inner side, and the two cushions (123) are mutually enclosed in the middle to form a circular cavity (124), the backrest frame (13) comprises a left backrest frame (131) and a right backrest frame (132) which are separated, the front end of the left backrest frame (131) is pivotally connected to the left upright rod (2), the front end of the right backrest frame (132) is pivotally connected to the right upright rod (3), the rear end of the left backrest frame (131) and the rear end of the right backrest frame (132) are mutually enclosed and locked by a backrest frame locking mechanism (5), and the left backrest frame (131) and the right backrest frame (132) are respectively provided with backrests (133) The side walls of the left upright (2) and the right upright (3) are provided with a lifting and locking mechanism for controlling the seat height, the lifting and locking mechanism comprising an inner tube (22) arranged in the left upright (2), a plurality of limiting holes (221) arranged at equal intervals on one side of the tube wall of the inner tube (22), and a locking member (222) matched with the limiting holes (221); the locking member (222) is a spherical structure, the tube wall of the left upright (2) is provided with a fixed shell (26) and a through hole (27) for the locking member (222) to pass through and for the locking member (222) to match with a certain limiting hole (221), the inner wall of the fixed shell (26) is provided with a through hole (27) for the locking member (222) to pass through and for the locking member (222) to match with a certain limiting hole (221), and the locking member (222) is provided with a through hole (27) for the locking member (222) to pass through and for the locking member (222) to match with a certain limiting hole (221). A cavity (261) is provided which is substantially parallel to the axis of the inner tube (22); a limiting column (262) is provided in the cavity (261) and can move up and down in the cavity (261); a return spring (263) is provided between the lower end of the limiting column (262) and the bottom of the cavity (261); a receiving groove (264) which can receive part of the locking member (222) is provided on the side wall of the limiting column (262); an inclined surface (266) is formed on the limiting column (262) at a position below the receiving groove (264); the inclined surface (266) can abut against the locking member (222) and push the metal ball into the limiting hole (221);The fixed housing (26) is provided with a fixed groove (28) below the cavity (261), a limiting cylinder (281) is provided in the fixing groove (28), a movable top ball (282) is provided in the limiting cylinder (281), a telescopic spring (283) is provided between the limiting cylinder (281) and the top ball (282), and the top ball (282) can enter one of the limiting holes (221) under the action of the telescopic spring (283). A stopper (284) is provided at the opening of the seat tube (281), an arc-shaped clamping portion (285) is provided on the inner wall of the stopper (284), the diameter of the top bead (282) is larger than the inner diameter of the arc-shaped clamping portion (285), an annular fixing block (271) is provided on the through hole (27), and the inner diameter of the annular fixing block (271) is smaller than the diameter of the locking member (222); the seat cushion frame (12) and the backrest frame (13) are connected via a connecting rod (16). ; 2. The foldable transfer chair according to claim 1, characterized in that: The base frame (1) comprises a first support rod (14) with two ends respectively arranged below the left upright rod (2) and the right upright rod (3); both ends of the first support rod (14) are provided with a second support rod (15) extending backwards and on the same side as the cushion frame (12); the first support rod (14) and the second support rod (15) are mutually enclosed to form a U-shaped structure; the tops of the left upright rod (2) and the right upright rod (3) are respectively fixed with a first handle (21) and a second handle (31).

3. The foldable transfer chair according to claim 1, characterized in that: A flip locking mechanism for controlling the folding of the seat is provided between the base frame (1) and the left upright pole (2) and the right upright pole (3), the flip locking mechanism comprising a connecting seat (23) provided below the inner tube (22), a connecting portion (223) provided at the bottom of the inner tube (22) and rotatably connected to one end of the connecting seat (23), and a locking handle (24) rotatably connected to the other end of the connecting seat (23).

4. The foldable transfer chair according to claim 3, characterized in that: A control wrench (29) is provided on the outside of the upper end of the fixed shell (26); a middle portion of the control wrench (29) is pivotally connected to the fixed shell (26); an end portion of the control wrench (29) abuts against an upper end of a limiting column (262); the control wrench (29) comprises a pressing portion (291) and a driving portion (292); an end portion of the driving portion (292) contacts a top end of the limiting column (262); and an inclined contact surface (293) is provided at the end portion of the driving portion (292).

5. The foldable transfer chair according to claim 3, characterized in that: A limiting portion (241) located above the connecting portion (223) is provided on the side wall of the locking handle (24), and a first fixing groove (242) is provided on the limiting portion (241). A positioning pin (243) is passed through the bottom of the first fixing groove (242), and a first fastening screw (244) is provided at the upper end of the first fixing groove (242). A compression spring (245) connected to the bottom of the first fastening screw (244) is provided at the upper end of the positioning pin (243). A lever (246) is passed through the middle of the positioning pin (243), and a positioning hole (231) matching the positioning pin (243) is provided at the top of the connecting seat (23). A strip groove (247) for allowing the lever (246) to move vertically is provided on the side wall of the first fixing groove (242).

6. The foldable transfer chair according to claim 5, characterized in that: The limiting portion (241) is provided with a second fixing groove (248), and a second fastening screw (249) is provided in the second fixing groove (248). The bottom end of the second fastening screw (249) protrudes from the bottom surface of the second fixing groove (248) and can contact the top surface of the connecting portion (223). The upper end of the connecting portion (223) is provided with an arc surface (232) at an angle, and the arc surface (232) is provided at an angle between the bottom end of the limiting portion (241) and the bottom end of the locking handle (24).

7. The foldable transfer chair according to claim 1, characterized in that: The seat cushion frame locking mechanism (4) is arranged on the connecting rod (16), and comprises a U-shaped fixing block (41) arranged at the rear end of the left seat cushion frame (121) and a locking block (42) arranged at the rear end of the right seat cushion frame (122) and located between two side walls of the U-shaped fixing block (41), one side of the locking block (42) is provided with a through groove (421), the U-shaped fixing block (41) is provided with a movable column (411) movable in the through groove (421), one side of the U-shaped fixing block (41) is provided with a first groove (412), the other side of the U-shaped fixing block (41) is provided with a second groove (413), and the movable column (411) is inserted into the first groove (412).

8. The foldable transfer chair according to claim 7, characterized in that: A pressure block (414) is provided at the end of the movable column (411) located in the first groove (412), a locking spring (415) is provided between the pressure block (414) and the first groove (412), the other end of the movable column (411) is provided with a clamping block (416) which is inserted into the second groove (413), the diameter of the clamping block (416) is larger than the diameter of the movable column (411), and a clamping groove (422) for the clamping block (416) to pass through is provided on one side of the through groove (421).

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